1/*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "jvm.h"
27#include "classfile/classLoader.hpp"
28#include "classfile/javaAssertions.hpp"
29#include "classfile/moduleEntry.hpp"
30#include "classfile/stringTable.hpp"
31#include "classfile/symbolTable.hpp"
32#include "gc/shared/gcArguments.hpp"
33#include "gc/shared/gcConfig.hpp"
34#include "logging/log.hpp"
35#include "logging/logConfiguration.hpp"
36#include "logging/logStream.hpp"
37#include "logging/logTag.hpp"
38#include "memory/allocation.inline.hpp"
39#include "memory/filemap.hpp"
40#include "oops/oop.inline.hpp"
41#include "prims/jvmtiExport.hpp"
42#include "runtime/arguments.hpp"
43#include "runtime/flags/jvmFlag.hpp"
44#include "runtime/flags/jvmFlagConstraintList.hpp"
45#include "runtime/flags/jvmFlagWriteableList.hpp"
46#include "runtime/flags/jvmFlagRangeList.hpp"
47#include "runtime/globals_extension.hpp"
48#include "runtime/java.hpp"
49#include "runtime/os.inline.hpp"
50#include "runtime/safepoint.hpp"
51#include "runtime/safepointMechanism.hpp"
52#include "runtime/vm_version.hpp"
53#include "services/management.hpp"
54#include "services/memTracker.hpp"
55#include "utilities/align.hpp"
56#include "utilities/defaultStream.hpp"
57#include "utilities/macros.hpp"
58#include "utilities/stringUtils.hpp"
59#if INCLUDE_JFR
60#include "jfr/jfr.hpp"
61#endif
62
63// Note: This is a special bug reporting site for the JVM
64#ifdef VENDOR_URL_VM_BUG
65# define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
66#else
67# define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
68#endif
69#define DEFAULT_JAVA_LAUNCHER "generic"
70
71char* Arguments::_jvm_flags_file = NULL;
72char** Arguments::_jvm_flags_array = NULL;
73int Arguments::_num_jvm_flags = 0;
74char** Arguments::_jvm_args_array = NULL;
75int Arguments::_num_jvm_args = 0;
76char* Arguments::_java_command = NULL;
77SystemProperty* Arguments::_system_properties = NULL;
78const char* Arguments::_gc_log_filename = NULL;
79size_t Arguments::_conservative_max_heap_alignment = 0;
80Arguments::Mode Arguments::_mode = _mixed;
81bool Arguments::_java_compiler = false;
82bool Arguments::_xdebug_mode = false;
83const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
84const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
85int Arguments::_sun_java_launcher_pid = -1;
86bool Arguments::_sun_java_launcher_is_altjvm = false;
87
88// These parameters are reset in method parse_vm_init_args()
89bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
90bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
91bool Arguments::_BackgroundCompilation = BackgroundCompilation;
92bool Arguments::_ClipInlining = ClipInlining;
93intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
94intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
95
96bool Arguments::_enable_preview = false;
97
98char* Arguments::SharedArchivePath = NULL;
99char* Arguments::SharedDynamicArchivePath = NULL;
100
101AgentLibraryList Arguments::_libraryList;
102AgentLibraryList Arguments::_agentList;
103
104// These are not set by the JDK's built-in launchers, but they can be set by
105// programs that embed the JVM using JNI_CreateJavaVM. See comments around
106// JavaVMOption in jni.h.
107abort_hook_t Arguments::_abort_hook = NULL;
108exit_hook_t Arguments::_exit_hook = NULL;
109vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
110
111
112SystemProperty *Arguments::_sun_boot_library_path = NULL;
113SystemProperty *Arguments::_java_library_path = NULL;
114SystemProperty *Arguments::_java_home = NULL;
115SystemProperty *Arguments::_java_class_path = NULL;
116SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
117SystemProperty *Arguments::_vm_info = NULL;
118
119GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
120PathString *Arguments::_system_boot_class_path = NULL;
121bool Arguments::_has_jimage = false;
122
123char* Arguments::_ext_dirs = NULL;
124
125bool PathString::set_value(const char *value) {
126 if (_value != NULL) {
127 FreeHeap(_value);
128 }
129 _value = AllocateHeap(strlen(value)+1, mtArguments);
130 assert(_value != NULL, "Unable to allocate space for new path value");
131 if (_value != NULL) {
132 strcpy(_value, value);
133 } else {
134 // not able to allocate
135 return false;
136 }
137 return true;
138}
139
140void PathString::append_value(const char *value) {
141 char *sp;
142 size_t len = 0;
143 if (value != NULL) {
144 len = strlen(value);
145 if (_value != NULL) {
146 len += strlen(_value);
147 }
148 sp = AllocateHeap(len+2, mtArguments);
149 assert(sp != NULL, "Unable to allocate space for new append path value");
150 if (sp != NULL) {
151 if (_value != NULL) {
152 strcpy(sp, _value);
153 strcat(sp, os::path_separator());
154 strcat(sp, value);
155 FreeHeap(_value);
156 } else {
157 strcpy(sp, value);
158 }
159 _value = sp;
160 }
161 }
162}
163
164PathString::PathString(const char* value) {
165 if (value == NULL) {
166 _value = NULL;
167 } else {
168 _value = AllocateHeap(strlen(value)+1, mtArguments);
169 strcpy(_value, value);
170 }
171}
172
173PathString::~PathString() {
174 if (_value != NULL) {
175 FreeHeap(_value);
176 _value = NULL;
177 }
178}
179
180ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
181 assert(module_name != NULL && path != NULL, "Invalid module name or path value");
182 size_t len = strlen(module_name) + 1;
183 _module_name = AllocateHeap(len, mtInternal);
184 strncpy(_module_name, module_name, len); // copy the trailing null
185 _path = new PathString(path);
186}
187
188ModulePatchPath::~ModulePatchPath() {
189 if (_module_name != NULL) {
190 FreeHeap(_module_name);
191 _module_name = NULL;
192 }
193 if (_path != NULL) {
194 delete _path;
195 _path = NULL;
196 }
197}
198
199SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
200 if (key == NULL) {
201 _key = NULL;
202 } else {
203 _key = AllocateHeap(strlen(key)+1, mtArguments);
204 strcpy(_key, key);
205 }
206 _next = NULL;
207 _internal = internal;
208 _writeable = writeable;
209}
210
211AgentLibrary::AgentLibrary(const char* name, const char* options,
212 bool is_absolute_path, void* os_lib,
213 bool instrument_lib) {
214 _name = AllocateHeap(strlen(name)+1, mtArguments);
215 strcpy(_name, name);
216 if (options == NULL) {
217 _options = NULL;
218 } else {
219 _options = AllocateHeap(strlen(options)+1, mtArguments);
220 strcpy(_options, options);
221 }
222 _is_absolute_path = is_absolute_path;
223 _os_lib = os_lib;
224 _next = NULL;
225 _state = agent_invalid;
226 _is_static_lib = false;
227 _is_instrument_lib = instrument_lib;
228}
229
230// Check if head of 'option' matches 'name', and sets 'tail' to the remaining
231// part of the option string.
232static bool match_option(const JavaVMOption *option, const char* name,
233 const char** tail) {
234 size_t len = strlen(name);
235 if (strncmp(option->optionString, name, len) == 0) {
236 *tail = option->optionString + len;
237 return true;
238 } else {
239 return false;
240 }
241}
242
243// Check if 'option' matches 'name'. No "tail" is allowed.
244static bool match_option(const JavaVMOption *option, const char* name) {
245 const char* tail = NULL;
246 bool result = match_option(option, name, &tail);
247 if (tail != NULL && *tail == '\0') {
248 return result;
249 } else {
250 return false;
251 }
252}
253
254// Return true if any of the strings in null-terminated array 'names' matches.
255// If tail_allowed is true, then the tail must begin with a colon; otherwise,
256// the option must match exactly.
257static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
258 bool tail_allowed) {
259 for (/* empty */; *names != NULL; ++names) {
260 if (match_option(option, *names, tail)) {
261 if (**tail == '\0' || (tail_allowed && **tail == ':')) {
262 return true;
263 }
264 }
265 }
266 return false;
267}
268
269#if INCLUDE_JFR
270static bool _has_jfr_option = false; // is using JFR
271
272// return true on failure
273static bool match_jfr_option(const JavaVMOption** option) {
274 assert((*option)->optionString != NULL, "invariant");
275 char* tail = NULL;
276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
277 _has_jfr_option = true;
278 return Jfr::on_start_flight_recording_option(option, tail);
279 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
280 _has_jfr_option = true;
281 return Jfr::on_flight_recorder_option(option, tail);
282 }
283 return false;
284}
285
286bool Arguments::has_jfr_option() {
287 return _has_jfr_option;
288}
289#endif
290
291static void logOption(const char* opt) {
292 if (PrintVMOptions) {
293 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
294 }
295}
296
297bool needs_module_property_warning = false;
298
299#define MODULE_PROPERTY_PREFIX "jdk.module."
300#define MODULE_PROPERTY_PREFIX_LEN 11
301#define ADDEXPORTS "addexports"
302#define ADDEXPORTS_LEN 10
303#define ADDREADS "addreads"
304#define ADDREADS_LEN 8
305#define ADDOPENS "addopens"
306#define ADDOPENS_LEN 8
307#define PATCH "patch"
308#define PATCH_LEN 5
309#define ADDMODS "addmods"
310#define ADDMODS_LEN 7
311#define LIMITMODS "limitmods"
312#define LIMITMODS_LEN 9
313#define PATH "path"
314#define PATH_LEN 4
315#define UPGRADE_PATH "upgrade.path"
316#define UPGRADE_PATH_LEN 12
317
318void Arguments::add_init_library(const char* name, char* options) {
319 _libraryList.add(new AgentLibrary(name, options, false, NULL));
320}
321
322void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
323 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
324}
325
326void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
327 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
328}
329
330// Late-binding agents not started via arguments
331void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
332 _agentList.add(agentLib);
333}
334
335// Return TRUE if option matches 'property', or 'property=', or 'property.'.
336static bool matches_property_suffix(const char* option, const char* property, size_t len) {
337 return ((strncmp(option, property, len) == 0) &&
338 (option[len] == '=' || option[len] == '.' || option[len] == '\0'));
339}
340
341// Return true if property starts with "jdk.module." and its ensuing chars match
342// any of the reserved module properties.
343// property should be passed without the leading "-D".
344bool Arguments::is_internal_module_property(const char* property) {
345 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
346 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
347 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
348 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
349 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
350 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
351 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
352 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
353 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
354 matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
355 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) {
356 return true;
357 }
358 }
359 return false;
360}
361
362// Process java launcher properties.
363void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
364 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
365 // sun.java.launcher.pid is defined.
366 // Must do this before setting up other system properties,
367 // as some of them may depend on launcher type.
368 for (int index = 0; index < args->nOptions; index++) {
369 const JavaVMOption* option = args->options + index;
370 const char* tail;
371
372 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
373 process_java_launcher_argument(tail, option->extraInfo);
374 continue;
375 }
376 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
377 if (strcmp(tail, "true") == 0) {
378 _sun_java_launcher_is_altjvm = true;
379 }
380 continue;
381 }
382 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
383 _sun_java_launcher_pid = atoi(tail);
384 continue;
385 }
386 }
387}
388
389// Initialize system properties key and value.
390void Arguments::init_system_properties() {
391
392 // Set up _system_boot_class_path which is not a property but
393 // relies heavily on argument processing and the jdk.boot.class.path.append
394 // property. It is used to store the underlying system boot class path.
395 _system_boot_class_path = new PathString(NULL);
396
397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
398 "Java Virtual Machine Specification", false));
399 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
401 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
402
403 // Initialize the vm.info now, but it will need updating after argument parsing.
404 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
405
406 // Following are JVMTI agent writable properties.
407 // Properties values are set to NULL and they are
408 // os specific they are initialized in os::init_system_properties_values().
409 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
410 _java_library_path = new SystemProperty("java.library.path", NULL, true);
411 _java_home = new SystemProperty("java.home", NULL, true);
412 _java_class_path = new SystemProperty("java.class.path", "", true);
413 // jdk.boot.class.path.append is a non-writeable, internal property.
414 // It can only be set by either:
415 // - -Xbootclasspath/a:
416 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
417 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true);
418
419 // Add to System Property list.
420 PropertyList_add(&_system_properties, _sun_boot_library_path);
421 PropertyList_add(&_system_properties, _java_library_path);
422 PropertyList_add(&_system_properties, _java_home);
423 PropertyList_add(&_system_properties, _java_class_path);
424 PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
425 PropertyList_add(&_system_properties, _vm_info);
426
427 // Set OS specific system properties values
428 os::init_system_properties_values();
429}
430
431// Update/Initialize System properties after JDK version number is known
432void Arguments::init_version_specific_system_properties() {
433 enum { bufsz = 16 };
434 char buffer[bufsz];
435 const char* spec_vendor = "Oracle Corporation";
436 uint32_t spec_version = JDK_Version::current().major_version();
437
438 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
439
440 PropertyList_add(&_system_properties,
441 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
442 PropertyList_add(&_system_properties,
443 new SystemProperty("java.vm.specification.version", buffer, false));
444 PropertyList_add(&_system_properties,
445 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
446}
447
448/*
449 * -XX argument processing:
450 *
451 * -XX arguments are defined in several places, such as:
452 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
453 * -XX arguments are parsed in parse_argument().
454 * -XX argument bounds checking is done in check_vm_args_consistency().
455 *
456 * Over time -XX arguments may change. There are mechanisms to handle common cases:
457 *
458 * ALIASED: An option that is simply another name for another option. This is often
459 * part of the process of deprecating a flag, but not all aliases need
460 * to be deprecated.
461 *
462 * Create an alias for an option by adding the old and new option names to the
463 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
464 *
465 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that
466 * support may be removed in the future. Both regular and aliased options may be
467 * deprecated.
468 *
469 * Add a deprecation warning for an option (or alias) by adding an entry in the
470 * "special_jvm_flags" table and setting the "deprecated_in" field.
471 * Often an option "deprecated" in one major release will
472 * be made "obsolete" in the next. In this case the entry should also have its
473 * "obsolete_in" field set.
474 *
475 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
476 * on the command line. A warning is printed to let the user know that option might not
477 * be accepted in the future.
478 *
479 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
480 * table and setting the "obsolete_in" field.
481 *
482 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
483 * to the current JDK version. The system will flatly refuse to admit the existence of
484 * the flag. This allows a flag to die automatically over JDK releases.
485 *
486 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
487 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
488 * - Newly obsolete or expired deprecated options should have their global variable
489 * definitions removed (from globals.hpp, etc) and related implementations removed.
490 *
491 * Recommended approach for removing options:
492 *
493 * To remove options commonly used by customers (e.g. product -XX options), use
494 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
495 *
496 * To remove internal options (e.g. diagnostic, experimental, develop options), use
497 * a 2-step model adding major release numbers to the obsolete and expire columns.
498 *
499 * To change the name of an option, use the alias table as well as a 2-step
500 * model adding major release numbers to the deprecate and expire columns.
501 * Think twice about aliasing commonly used customer options.
502 *
503 * There are times when it is appropriate to leave a future release number as undefined.
504 *
505 * Tests: Aliases should be tested in VMAliasOptions.java.
506 * Deprecated options should be tested in VMDeprecatedOptions.java.
507 */
508
509// The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
510// "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
511// When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
512// the command-line as usual, but will issue a warning.
513// When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
514// the command-line, while issuing a warning and ignoring the flag value.
515// Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
516// existence of the flag.
517//
518// MANUAL CLEANUP ON JDK VERSION UPDATES:
519// This table ensures that the handling of options will update automatically when the JDK
520// version is incremented, but the source code needs to be cleanup up manually:
521// - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
522// variable should be removed, as well as users of the variable.
523// - As "deprecated" options age into "obsolete" options, move the entry into the
524// "Obsolete Flags" section of the table.
525// - All expired options should be removed from the table.
526static SpecialFlag const special_jvm_flags[] = {
527 // -------------- Deprecated Flags --------------
528 // --- Non-alias flags - sorted by obsolete_in then expired_in:
529 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
530 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
531 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
532 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
533 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
534 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() },
535 { "CompilationPolicyChoice", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::undefined() },
536 { "FailOverToOldVerifier", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::undefined() },
537 { "AllowJNIEnvProxy", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
538 { "ThreadLocalHandshakes", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) },
539 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
540 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
541
542 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
543 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
544 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
545 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
546
547 // -------------- Obsolete Flags - sorted by expired_in --------------
548 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
549 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() },
550 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
551 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
552 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
553 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() },
554 { "ProfilerPrintByteCodeStatistics", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
555 { "ProfilerRecordPC", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
556 { "ProfileVM", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
557 { "ProfileIntervals", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
558 { "ProfileIntervalsTicks", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
559 { "ProfilerCheckIntervals", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
560 { "ProfilerNumberOfInterpretedMethods", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
561 { "ProfilerNumberOfCompiledMethods", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
562 { "ProfilerNumberOfStubMethods", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
563 { "ProfilerNumberOfRuntimeStubNodes", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
564 { "UseImplicitStableValues", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
565 { "NeedsDeoptSuspend", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) },
566
567#ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
568 // These entries will generate build errors. Their purpose is to test the macros.
569 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
570 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
571 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
572 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
573 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
574 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
575#endif
576
577 { NULL, JDK_Version(0), JDK_Version(0) }
578};
579
580// Flags that are aliases for other flags.
581typedef struct {
582 const char* alias_name;
583 const char* real_name;
584} AliasedFlag;
585
586static AliasedFlag const aliased_jvm_flags[] = {
587 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
588 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
589 { NULL, NULL}
590};
591
592// NOTE: A compatibility request will be necessary for each alias to be removed.
593static AliasedLoggingFlag const aliased_logging_flags[] = {
594 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) },
595 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) },
596 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) },
597 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) },
598 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) },
599 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) },
600 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) },
601 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) },
602 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) },
603 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) },
604 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) },
605 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) },
606 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) },
607 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) },
608 { "TraceNMethodInstalls", LogLevel::Info, true, LOG_TAGS(nmethod, install) },
609 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) }
610};
611
612#ifndef PRODUCT
613// These options are removed in jdk9. Remove this code for jdk10.
614static AliasedFlag const removed_develop_logging_flags[] = {
615 { "TraceClassInitialization", "-Xlog:class+init" },
616 { "TraceClassLoaderData", "-Xlog:class+loader+data" },
617 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" },
618 { "TraceItables", "-Xlog:itables=debug" },
619 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" },
620 { "TraceSafepoint", "-Xlog:safepoint=debug" },
621 { "TraceStartupTime", "-Xlog:startuptime" },
622 { "TraceVMOperation", "-Xlog:vmoperation=debug" },
623 { "PrintVtables", "-Xlog:vtables=debug" },
624 { "VerboseVerification", "-Xlog:verification" },
625 { NULL, NULL }
626};
627#endif //PRODUCT
628
629// Return true if "v" is less than "other", where "other" may be "undefined".
630static bool version_less_than(JDK_Version v, JDK_Version other) {
631 assert(!v.is_undefined(), "must be defined");
632 if (!other.is_undefined() && v.compare(other) >= 0) {
633 return false;
634 } else {
635 return true;
636 }
637}
638
639extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag);
640
641static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
642 // Allow extensions to have priority
643 if (lookup_special_flag_ext(flag_name, flag)) {
644 return true;
645 }
646
647 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
648 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
649 flag = special_jvm_flags[i];
650 return true;
651 }
652 }
653 return false;
654}
655
656bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
657 assert(version != NULL, "Must provide a version buffer");
658 SpecialFlag flag;
659 if (lookup_special_flag(flag_name, flag)) {
660 if (!flag.obsolete_in.is_undefined()) {
661 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
662 *version = flag.obsolete_in;
663 return true;
664 }
665 }
666 }
667 return false;
668}
669
670int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
671 assert(version != NULL, "Must provide a version buffer");
672 SpecialFlag flag;
673 if (lookup_special_flag(flag_name, flag)) {
674 if (!flag.deprecated_in.is_undefined()) {
675 if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
676 version_less_than(JDK_Version::current(), flag.expired_in)) {
677 *version = flag.deprecated_in;
678 return 1;
679 } else {
680 return -1;
681 }
682 }
683 }
684 return 0;
685}
686
687#ifndef PRODUCT
688const char* Arguments::removed_develop_logging_flag_name(const char* name){
689 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) {
690 const AliasedFlag& flag = removed_develop_logging_flags[i];
691 if (strcmp(flag.alias_name, name) == 0) {
692 return flag.real_name;
693 }
694 }
695 return NULL;
696}
697#endif // PRODUCT
698
699const char* Arguments::real_flag_name(const char *flag_name) {
700 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
701 const AliasedFlag& flag_status = aliased_jvm_flags[i];
702 if (strcmp(flag_status.alias_name, flag_name) == 0) {
703 return flag_status.real_name;
704 }
705 }
706 return flag_name;
707}
708
709#ifdef ASSERT
710static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
711 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
712 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
713 return true;
714 }
715 }
716 return false;
717}
718
719// Verifies the correctness of the entries in the special_jvm_flags table.
720// If there is a semantic error (i.e. a bug in the table) such as the obsoletion
721// version being earlier than the deprecation version, then a warning is issued
722// and verification fails - by returning false. If it is detected that the table
723// is out of date, with respect to the current version, then a warning is issued
724// but verification does not fail. This allows the VM to operate when the version
725// is first updated, without needing to update all the impacted flags at the
726// same time.
727static bool verify_special_jvm_flags() {
728 bool success = true;
729 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
730 const SpecialFlag& flag = special_jvm_flags[i];
731 if (lookup_special_flag(flag.name, i)) {
732 warning("Duplicate special flag declaration \"%s\"", flag.name);
733 success = false;
734 }
735 if (flag.deprecated_in.is_undefined() &&
736 flag.obsolete_in.is_undefined()) {
737 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
738 success = false;
739 }
740
741 if (!flag.deprecated_in.is_undefined()) {
742 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
743 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
744 success = false;
745 }
746
747 if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
748 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
749 success = false;
750 }
751 }
752
753 if (!flag.obsolete_in.is_undefined()) {
754 if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
755 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
756 success = false;
757 }
758
759 // if flag has become obsolete it should not have a "globals" flag defined anymore.
760 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
761 if (JVMFlag::find_flag(flag.name) != NULL) {
762 // Temporarily disable the warning: 8196739
763 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
764 }
765 }
766 }
767
768 if (!flag.expired_in.is_undefined()) {
769 // if flag has become expired it should not have a "globals" flag defined anymore.
770 if (!version_less_than(JDK_Version::current(), flag.expired_in)) {
771 if (JVMFlag::find_flag(flag.name) != NULL) {
772 // Temporarily disable the warning: 8196739
773 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
774 }
775 }
776 }
777
778 }
779 return success;
780}
781#endif
782
783// Parses a size specification string.
784bool Arguments::atojulong(const char *s, julong* result) {
785 julong n = 0;
786
787 // First char must be a digit. Don't allow negative numbers or leading spaces.
788 if (!isdigit(*s)) {
789 return false;
790 }
791
792 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X'));
793 char* remainder;
794 errno = 0;
795 n = strtoull(s, &remainder, (is_hex ? 16 : 10));
796 if (errno != 0) {
797 return false;
798 }
799
800 // Fail if no number was read at all or if the remainder contains more than a single non-digit character.
801 if (remainder == s || strlen(remainder) > 1) {
802 return false;
803 }
804
805 switch (*remainder) {
806 case 'T': case 't':
807 *result = n * G * K;
808 // Check for overflow.
809 if (*result/((julong)G * K) != n) return false;
810 return true;
811 case 'G': case 'g':
812 *result = n * G;
813 if (*result/G != n) return false;
814 return true;
815 case 'M': case 'm':
816 *result = n * M;
817 if (*result/M != n) return false;
818 return true;
819 case 'K': case 'k':
820 *result = n * K;
821 if (*result/K != n) return false;
822 return true;
823 case '\0':
824 *result = n;
825 return true;
826 default:
827 return false;
828 }
829}
830
831Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
832 if (size < min_size) return arg_too_small;
833 if (size > max_size) return arg_too_big;
834 return arg_in_range;
835}
836
837// Describe an argument out of range error
838void Arguments::describe_range_error(ArgsRange errcode) {
839 switch(errcode) {
840 case arg_too_big:
841 jio_fprintf(defaultStream::error_stream(),
842 "The specified size exceeds the maximum "
843 "representable size.\n");
844 break;
845 case arg_too_small:
846 case arg_unreadable:
847 case arg_in_range:
848 // do nothing for now
849 break;
850 default:
851 ShouldNotReachHere();
852 }
853}
854
855static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) {
856 if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) {
857 return true;
858 } else {
859 return false;
860 }
861}
862
863static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
864 char* end;
865 errno = 0;
866 double v = strtod(value, &end);
867 if ((errno != 0) || (*end != 0)) {
868 return false;
869 }
870
871 if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) {
872 return true;
873 }
874 return false;
875}
876
877static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) {
878 julong v;
879 int int_v;
880 intx intx_v;
881 bool is_neg = false;
882 JVMFlag* result = JVMFlag::find_flag(name, strlen(name));
883
884 if (result == NULL) {
885 return false;
886 }
887
888 // Check the sign first since atojulong() parses only unsigned values.
889 if (*value == '-') {
890 if (!result->is_intx() && !result->is_int()) {
891 return false;
892 }
893 value++;
894 is_neg = true;
895 }
896 if (!Arguments::atojulong(value, &v)) {
897 return false;
898 }
899 if (result->is_int()) {
900 int_v = (int) v;
901 if (is_neg) {
902 int_v = -int_v;
903 }
904 return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS;
905 } else if (result->is_uint()) {
906 uint uint_v = (uint) v;
907 return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS;
908 } else if (result->is_intx()) {
909 intx_v = (intx) v;
910 if (is_neg) {
911 intx_v = -intx_v;
912 }
913 return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS;
914 } else if (result->is_uintx()) {
915 uintx uintx_v = (uintx) v;
916 return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS;
917 } else if (result->is_uint64_t()) {
918 uint64_t uint64_t_v = (uint64_t) v;
919 return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS;
920 } else if (result->is_size_t()) {
921 size_t size_t_v = (size_t) v;
922 return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS;
923 } else if (result->is_double()) {
924 double double_v = (double) v;
925 return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS;
926 } else {
927 return false;
928 }
929}
930
931static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) {
932 if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false;
933 // Contract: JVMFlag always returns a pointer that needs freeing.
934 FREE_C_HEAP_ARRAY(char, value);
935 return true;
936}
937
938static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) {
939 const char* old_value = "";
940 if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false;
941 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
942 size_t new_len = strlen(new_value);
943 const char* value;
944 char* free_this_too = NULL;
945 if (old_len == 0) {
946 value = new_value;
947 } else if (new_len == 0) {
948 value = old_value;
949 } else {
950 size_t length = old_len + 1 + new_len + 1;
951 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
952 // each new setting adds another LINE to the switch:
953 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
954 value = buf;
955 free_this_too = buf;
956 }
957 (void) JVMFlag::ccstrAtPut(name, &value, origin);
958 // JVMFlag always returns a pointer that needs freeing.
959 FREE_C_HEAP_ARRAY(char, value);
960 if (free_this_too != NULL) {
961 // JVMFlag made its own copy, so I must delete my own temp. buffer.
962 FREE_C_HEAP_ARRAY(char, free_this_too);
963 }
964 return true;
965}
966
967const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
968 const char* real_name = real_flag_name(arg);
969 JDK_Version since = JDK_Version();
970 switch (is_deprecated_flag(arg, &since)) {
971 case -1:
972 return NULL; // obsolete or expired, don't process normally
973 case 0:
974 return real_name;
975 case 1: {
976 if (warn) {
977 char version[256];
978 since.to_string(version, sizeof(version));
979 if (real_name != arg) {
980 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
981 arg, version, real_name);
982 } else {
983 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
984 arg, version);
985 }
986 }
987 return real_name;
988 }
989 }
990 ShouldNotReachHere();
991 return NULL;
992}
993
994void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) {
995 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5};
996 // Set tagset string buffer at max size of 256, large enough for any alias tagset
997 const int max_tagset_size = 256;
998 int max_tagset_len = max_tagset_size - 1;
999 char tagset_buffer[max_tagset_size];
1000 tagset_buffer[0] = '\0';
1001
1002 // Write tag-set for aliased logging option, in string list form
1003 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]);
1004 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) {
1005 if (i > 0) {
1006 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer));
1007 }
1008 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer));
1009 }
1010 if (!alf.exactMatch) {
1011 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer));
1012 }
1013 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.",
1014 (on) ? "+" : "-",
1015 name,
1016 tagset_buffer,
1017 (on) ? LogLevel::name(alf.level) : "off");
1018}
1019
1020AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){
1021 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) {
1022 const AliasedLoggingFlag& alf = aliased_logging_flags[i];
1023 if (strcmp(alf.alias_name, name) == 0) {
1024 log_deprecated_flag(name, on, alf);
1025 return alf;
1026 }
1027 }
1028 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)};
1029 return a;
1030}
1031
1032bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) {
1033
1034 // range of acceptable characters spelled out for portability reasons
1035#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
1036#define BUFLEN 255
1037 char name[BUFLEN+1];
1038 char dummy;
1039 const char* real_name;
1040 bool warn_if_deprecated = true;
1041
1042 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1043 AliasedLoggingFlag alf = catch_logging_aliases(name, false);
1044 if (alf.alias_name != NULL){
1045 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1046 return true;
1047 }
1048 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1049 if (real_name == NULL) {
1050 return false;
1051 }
1052 return set_bool_flag(real_name, false, origin);
1053 }
1054 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
1055 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1056 if (alf.alias_name != NULL){
1057 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1058 return true;
1059 }
1060 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1061 if (real_name == NULL) {
1062 return false;
1063 }
1064 return set_bool_flag(real_name, true, origin);
1065 }
1066
1067 char punct;
1068 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
1069 const char* value = strchr(arg, '=') + 1;
1070 JVMFlag* flag;
1071
1072 // this scanf pattern matches both strings (handled here) and numbers (handled later))
1073 AliasedLoggingFlag alf = catch_logging_aliases(name, true);
1074 if (alf.alias_name != NULL) {
1075 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5);
1076 return true;
1077 }
1078 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1079 if (real_name == NULL) {
1080 return false;
1081 }
1082 flag = JVMFlag::find_flag(real_name);
1083 if (flag != NULL && flag->is_ccstr()) {
1084 if (flag->ccstr_accumulates()) {
1085 return append_to_string_flag(real_name, value, origin);
1086 } else {
1087 if (value[0] == '\0') {
1088 value = NULL;
1089 }
1090 return set_string_flag(real_name, value, origin);
1091 }
1092 } else {
1093 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
1094 }
1095 }
1096
1097 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
1098 const char* value = strchr(arg, '=') + 1;
1099 // -XX:Foo:=xxx will reset the string flag to the given value.
1100 if (value[0] == '\0') {
1101 value = NULL;
1102 }
1103 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1104 if (real_name == NULL) {
1105 return false;
1106 }
1107 return set_string_flag(real_name, value, origin);
1108 }
1109
1110#define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]"
1111#define SIGNED_NUMBER_RANGE "[-0123456789]"
1112#define NUMBER_RANGE "[0123456789eE+-]"
1113 char value[BUFLEN + 1];
1114 char value2[BUFLEN + 1];
1115 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
1116 // Looks like a floating-point number -- try again with more lenient format string
1117 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
1118 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1119 if (real_name == NULL) {
1120 return false;
1121 }
1122 return set_fp_numeric_flag(real_name, value, origin);
1123 }
1124 }
1125
1126#define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
1127 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
1128 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
1129 if (real_name == NULL) {
1130 return false;
1131 }
1132 return set_numeric_flag(real_name, value, origin);
1133 }
1134
1135 return false;
1136}
1137
1138void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
1139 assert(bldarray != NULL, "illegal argument");
1140
1141 if (arg == NULL) {
1142 return;
1143 }
1144
1145 int new_count = *count + 1;
1146
1147 // expand the array and add arg to the last element
1148 if (*bldarray == NULL) {
1149 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
1150 } else {
1151 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
1152 }
1153 (*bldarray)[*count] = os::strdup_check_oom(arg);
1154 *count = new_count;
1155}
1156
1157void Arguments::build_jvm_args(const char* arg) {
1158 add_string(&_jvm_args_array, &_num_jvm_args, arg);
1159}
1160
1161void Arguments::build_jvm_flags(const char* arg) {
1162 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
1163}
1164
1165// utility function to return a string that concatenates all
1166// strings in a given char** array
1167const char* Arguments::build_resource_string(char** args, int count) {
1168 if (args == NULL || count == 0) {
1169 return NULL;
1170 }
1171 size_t length = 0;
1172 for (int i = 0; i < count; i++) {
1173 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
1174 }
1175 char* s = NEW_RESOURCE_ARRAY(char, length);
1176 char* dst = s;
1177 for (int j = 0; j < count; j++) {
1178 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
1179 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
1180 dst += offset;
1181 length -= offset;
1182 }
1183 return (const char*) s;
1184}
1185
1186void Arguments::print_on(outputStream* st) {
1187 st->print_cr("VM Arguments:");
1188 if (num_jvm_flags() > 0) {
1189 st->print("jvm_flags: "); print_jvm_flags_on(st);
1190 st->cr();
1191 }
1192 if (num_jvm_args() > 0) {
1193 st->print("jvm_args: "); print_jvm_args_on(st);
1194 st->cr();
1195 }
1196 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
1197 if (_java_class_path != NULL) {
1198 char* path = _java_class_path->value();
1199 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
1200 }
1201 st->print_cr("Launcher Type: %s", _sun_java_launcher);
1202}
1203
1204void Arguments::print_summary_on(outputStream* st) {
1205 // Print the command line. Environment variables that are helpful for
1206 // reproducing the problem are written later in the hs_err file.
1207 // flags are from setting file
1208 if (num_jvm_flags() > 0) {
1209 st->print_raw("Settings File: ");
1210 print_jvm_flags_on(st);
1211 st->cr();
1212 }
1213 // args are the command line and environment variable arguments.
1214 st->print_raw("Command Line: ");
1215 if (num_jvm_args() > 0) {
1216 print_jvm_args_on(st);
1217 }
1218 // this is the classfile and any arguments to the java program
1219 if (java_command() != NULL) {
1220 st->print("%s", java_command());
1221 }
1222 st->cr();
1223}
1224
1225void Arguments::print_jvm_flags_on(outputStream* st) {
1226 if (_num_jvm_flags > 0) {
1227 for (int i=0; i < _num_jvm_flags; i++) {
1228 st->print("%s ", _jvm_flags_array[i]);
1229 }
1230 }
1231}
1232
1233void Arguments::print_jvm_args_on(outputStream* st) {
1234 if (_num_jvm_args > 0) {
1235 for (int i=0; i < _num_jvm_args; i++) {
1236 st->print("%s ", _jvm_args_array[i]);
1237 }
1238 }
1239}
1240
1241bool Arguments::process_argument(const char* arg,
1242 jboolean ignore_unrecognized,
1243 JVMFlag::Flags origin) {
1244 JDK_Version since = JDK_Version();
1245
1246 if (parse_argument(arg, origin)) {
1247 return true;
1248 }
1249
1250 // Determine if the flag has '+', '-', or '=' characters.
1251 bool has_plus_minus = (*arg == '+' || *arg == '-');
1252 const char* const argname = has_plus_minus ? arg + 1 : arg;
1253
1254 size_t arg_len;
1255 const char* equal_sign = strchr(argname, '=');
1256 if (equal_sign == NULL) {
1257 arg_len = strlen(argname);
1258 } else {
1259 arg_len = equal_sign - argname;
1260 }
1261
1262 // Only make the obsolete check for valid arguments.
1263 if (arg_len <= BUFLEN) {
1264 // Construct a string which consists only of the argument name without '+', '-', or '='.
1265 char stripped_argname[BUFLEN+1]; // +1 for '\0'
1266 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1267 if (is_obsolete_flag(stripped_argname, &since)) {
1268 char version[256];
1269 since.to_string(version, sizeof(version));
1270 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1271 return true;
1272 }
1273#ifndef PRODUCT
1274 else {
1275 const char* replacement;
1276 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){
1277 log_warning(arguments)("%s has been removed. Please use %s instead.",
1278 stripped_argname,
1279 replacement);
1280 return false;
1281 }
1282 }
1283#endif //PRODUCT
1284 }
1285
1286 // For locked flags, report a custom error message if available.
1287 // Otherwise, report the standard unrecognized VM option.
1288 JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true);
1289 if (found_flag != NULL) {
1290 char locked_message_buf[BUFLEN];
1291 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1292 if (strlen(locked_message_buf) == 0) {
1293 if (found_flag->is_bool() && !has_plus_minus) {
1294 jio_fprintf(defaultStream::error_stream(),
1295 "Missing +/- setting for VM option '%s'\n", argname);
1296 } else if (!found_flag->is_bool() && has_plus_minus) {
1297 jio_fprintf(defaultStream::error_stream(),
1298 "Unexpected +/- setting in VM option '%s'\n", argname);
1299 } else {
1300 jio_fprintf(defaultStream::error_stream(),
1301 "Improperly specified VM option '%s'\n", argname);
1302 }
1303 } else {
1304#ifdef PRODUCT
1305 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
1306 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
1307 if (ignore_unrecognized && mismatched) {
1308 return true;
1309 }
1310#endif
1311 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1312 }
1313 } else {
1314 if (ignore_unrecognized) {
1315 return true;
1316 }
1317 jio_fprintf(defaultStream::error_stream(),
1318 "Unrecognized VM option '%s'\n", argname);
1319 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1320 if (fuzzy_matched != NULL) {
1321 jio_fprintf(defaultStream::error_stream(),
1322 "Did you mean '%s%s%s'? ",
1323 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1324 fuzzy_matched->_name,
1325 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1326 }
1327 }
1328
1329 // allow for commandline "commenting out" options like -XX:#+Verbose
1330 return arg[0] == '#';
1331}
1332
1333bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1334 FILE* stream = fopen(file_name, "rb");
1335 if (stream == NULL) {
1336 if (should_exist) {
1337 jio_fprintf(defaultStream::error_stream(),
1338 "Could not open settings file %s\n", file_name);
1339 return false;
1340 } else {
1341 return true;
1342 }
1343 }
1344
1345 char token[1024];
1346 int pos = 0;
1347
1348 bool in_white_space = true;
1349 bool in_comment = false;
1350 bool in_quote = false;
1351 char quote_c = 0;
1352 bool result = true;
1353
1354 int c = getc(stream);
1355 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1356 if (in_white_space) {
1357 if (in_comment) {
1358 if (c == '\n') in_comment = false;
1359 } else {
1360 if (c == '#') in_comment = true;
1361 else if (!isspace(c)) {
1362 in_white_space = false;
1363 token[pos++] = c;
1364 }
1365 }
1366 } else {
1367 if (c == '\n' || (!in_quote && isspace(c))) {
1368 // token ends at newline, or at unquoted whitespace
1369 // this allows a way to include spaces in string-valued options
1370 token[pos] = '\0';
1371 logOption(token);
1372 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1373 build_jvm_flags(token);
1374 pos = 0;
1375 in_white_space = true;
1376 in_quote = false;
1377 } else if (!in_quote && (c == '\'' || c == '"')) {
1378 in_quote = true;
1379 quote_c = c;
1380 } else if (in_quote && (c == quote_c)) {
1381 in_quote = false;
1382 } else {
1383 token[pos++] = c;
1384 }
1385 }
1386 c = getc(stream);
1387 }
1388 if (pos > 0) {
1389 token[pos] = '\0';
1390 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE);
1391 build_jvm_flags(token);
1392 }
1393 fclose(stream);
1394 return result;
1395}
1396
1397//=============================================================================================================
1398// Parsing of properties (-D)
1399
1400const char* Arguments::get_property(const char* key) {
1401 return PropertyList_get_value(system_properties(), key);
1402}
1403
1404bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
1405 const char* eq = strchr(prop, '=');
1406 const char* key;
1407 const char* value = "";
1408
1409 if (eq == NULL) {
1410 // property doesn't have a value, thus use passed string
1411 key = prop;
1412 } else {
1413 // property have a value, thus extract it and save to the
1414 // allocated string
1415 size_t key_len = eq - prop;
1416 char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1417
1418 jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1419 key = tmp_key;
1420
1421 value = &prop[key_len + 1];
1422 }
1423
1424 if (strcmp(key, "java.compiler") == 0) {
1425 process_java_compiler_argument(value);
1426 // Record value in Arguments, but let it get passed to Java.
1427 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1428 strcmp(key, "sun.java.launcher.pid") == 0) {
1429 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1430 // private and are processed in process_sun_java_launcher_properties();
1431 // the sun.java.launcher property is passed on to the java application
1432 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1433 // append is true, writable is true, internal is false
1434 PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1435 WriteableProperty, ExternalProperty);
1436 } else {
1437 if (strcmp(key, "sun.java.command") == 0) {
1438 char *old_java_command = _java_command;
1439 _java_command = os::strdup_check_oom(value, mtArguments);
1440 if (old_java_command != NULL) {
1441 os::free(old_java_command);
1442 }
1443 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1444 const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1445 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1446 // its value without going through the property list or making a Java call.
1447 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1448 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1449 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1450 os::free((void *)old_java_vendor_url_bug);
1451 }
1452 }
1453
1454 // Create new property and add at the end of the list
1455 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1456 }
1457
1458 if (key != prop) {
1459 // SystemProperty copy passed value, thus free previously allocated
1460 // memory
1461 FreeHeap((void *)key);
1462 }
1463
1464 return true;
1465}
1466
1467#if INCLUDE_CDS
1468const char* unsupported_properties[] = { "jdk.module.limitmods",
1469 "jdk.module.upgrade.path",
1470 "jdk.module.patch.0" };
1471const char* unsupported_options[] = { "--limit-modules",
1472 "--upgrade-module-path",
1473 "--patch-module"
1474 };
1475void Arguments::check_unsupported_dumping_properties() {
1476 assert(DumpSharedSpaces || DynamicDumpSharedSpaces,
1477 "this function is only used with CDS dump time");
1478 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1479 // If a vm option is found in the unsupported_options array, vm will exit with an error message.
1480 SystemProperty* sp = system_properties();
1481 while (sp != NULL) {
1482 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1483 if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
1484 vm_exit_during_initialization(
1485 "Cannot use the following option when dumping the shared archive", unsupported_options[i]);
1486 }
1487 }
1488 sp = sp->next();
1489 }
1490
1491 // Check for an exploded module build in use with -Xshare:dump.
1492 if (!has_jimage()) {
1493 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
1494 }
1495}
1496
1497bool Arguments::check_unsupported_cds_runtime_properties() {
1498 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
1499 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
1500 if (ArchiveClassesAtExit != NULL) {
1501 // dynamic dumping, just return false for now.
1502 // check_unsupported_dumping_properties() will be called later to check the same set of
1503 // properties, and will exit the VM with the correct error message if the unsupported properties
1504 // are used.
1505 return false;
1506 }
1507 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
1508 if (get_property(unsupported_properties[i]) != NULL) {
1509 if (RequireSharedSpaces) {
1510 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
1511 }
1512 return true;
1513 }
1514 }
1515 return false;
1516}
1517#endif
1518
1519//===========================================================================================================
1520// Setting int/mixed/comp mode flags
1521
1522void Arguments::set_mode_flags(Mode mode) {
1523 // Set up default values for all flags.
1524 // If you add a flag to any of the branches below,
1525 // add a default value for it here.
1526 set_java_compiler(false);
1527 _mode = mode;
1528
1529 // Ensure Agent_OnLoad has the correct initial values.
1530 // This may not be the final mode; mode may change later in onload phase.
1531 PropertyList_unique_add(&_system_properties, "java.vm.info",
1532 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1533
1534 UseInterpreter = true;
1535 UseCompiler = true;
1536 UseLoopCounter = true;
1537
1538 // Default values may be platform/compiler dependent -
1539 // use the saved values
1540 ClipInlining = Arguments::_ClipInlining;
1541 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1542 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1543 BackgroundCompilation = Arguments::_BackgroundCompilation;
1544 if (TieredCompilation) {
1545 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1546 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1547 }
1548 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1549 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1550 }
1551 }
1552
1553 // Change from defaults based on mode
1554 switch (mode) {
1555 default:
1556 ShouldNotReachHere();
1557 break;
1558 case _int:
1559 UseCompiler = false;
1560 UseLoopCounter = false;
1561 AlwaysCompileLoopMethods = false;
1562 UseOnStackReplacement = false;
1563 break;
1564 case _mixed:
1565 // same as default
1566 break;
1567 case _comp:
1568 UseInterpreter = false;
1569 BackgroundCompilation = false;
1570 ClipInlining = false;
1571 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1572 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1573 // compile a level 4 (C2) and then continue executing it.
1574 if (TieredCompilation) {
1575 Tier3InvokeNotifyFreqLog = 0;
1576 Tier4InvocationThreshold = 0;
1577 }
1578 break;
1579 }
1580}
1581
1582// Conflict: required to use shared spaces (-Xshare:on), but
1583// incompatible command line options were chosen.
1584static void no_shared_spaces(const char* message) {
1585 if (RequireSharedSpaces) {
1586 jio_fprintf(defaultStream::error_stream(),
1587 "Class data sharing is inconsistent with other specified options.\n");
1588 vm_exit_during_initialization("Unable to use shared archive", message);
1589 } else {
1590 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1591 }
1592}
1593
1594void set_object_alignment() {
1595 // Object alignment.
1596 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1597 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1598 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1599 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1600 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1601 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1602
1603 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1604 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1605
1606 // Oop encoding heap max
1607 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1608
1609 if (SurvivorAlignmentInBytes == 0) {
1610 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1611 }
1612}
1613
1614size_t Arguments::max_heap_for_compressed_oops() {
1615 // Avoid sign flip.
1616 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1617 // We need to fit both the NULL page and the heap into the memory budget, while
1618 // keeping alignment constraints of the heap. To guarantee the latter, as the
1619 // NULL page is located before the heap, we pad the NULL page to the conservative
1620 // maximum alignment that the GC may ever impose upon the heap.
1621 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
1622 _conservative_max_heap_alignment);
1623
1624 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1625 NOT_LP64(ShouldNotReachHere(); return 0);
1626}
1627
1628void Arguments::set_use_compressed_oops() {
1629#ifndef ZERO
1630#ifdef _LP64
1631 // MaxHeapSize is not set up properly at this point, but
1632 // the only value that can override MaxHeapSize if we are
1633 // to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1634 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1635
1636 if (max_heap_size <= max_heap_for_compressed_oops()) {
1637#if !defined(COMPILER1) || defined(TIERED)
1638 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1639 FLAG_SET_ERGO(UseCompressedOops, true);
1640 }
1641#endif
1642 } else {
1643 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1644 warning("Max heap size too large for Compressed Oops");
1645 FLAG_SET_DEFAULT(UseCompressedOops, false);
1646 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1647 }
1648 }
1649#endif // _LP64
1650#endif // ZERO
1651}
1652
1653
1654// NOTE: set_use_compressed_klass_ptrs() must be called after calling
1655// set_use_compressed_oops().
1656void Arguments::set_use_compressed_klass_ptrs() {
1657#ifndef ZERO
1658#ifdef _LP64
1659 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1660 if (!UseCompressedOops) {
1661 if (UseCompressedClassPointers) {
1662 warning("UseCompressedClassPointers requires UseCompressedOops");
1663 }
1664 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1665 } else {
1666 // Turn on UseCompressedClassPointers too
1667 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1668 FLAG_SET_ERGO(UseCompressedClassPointers, true);
1669 }
1670 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1671 if (UseCompressedClassPointers) {
1672 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1673 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1674 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1675 }
1676 }
1677 }
1678#endif // _LP64
1679#endif // !ZERO
1680}
1681
1682void Arguments::set_conservative_max_heap_alignment() {
1683 // The conservative maximum required alignment for the heap is the maximum of
1684 // the alignments imposed by several sources: any requirements from the heap
1685 // itself and the maximum page size we may run the VM with.
1686 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1687 _conservative_max_heap_alignment = MAX4(heap_alignment,
1688 (size_t)os::vm_allocation_granularity(),
1689 os::max_page_size(),
1690 GCArguments::compute_heap_alignment());
1691}
1692
1693jint Arguments::set_ergonomics_flags() {
1694 GCConfig::initialize();
1695
1696 set_conservative_max_heap_alignment();
1697
1698#ifndef ZERO
1699#ifdef _LP64
1700 set_use_compressed_oops();
1701
1702 // set_use_compressed_klass_ptrs() must be called after calling
1703 // set_use_compressed_oops().
1704 set_use_compressed_klass_ptrs();
1705
1706 // Also checks that certain machines are slower with compressed oops
1707 // in vm_version initialization code.
1708#endif // _LP64
1709#endif // !ZERO
1710
1711 return JNI_OK;
1712}
1713
1714julong Arguments::limit_by_allocatable_memory(julong limit) {
1715 julong max_allocatable;
1716 julong result = limit;
1717 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1718 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1719 }
1720 return result;
1721}
1722
1723// Use static initialization to get the default before parsing
1724static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1725
1726void Arguments::set_heap_size() {
1727 julong phys_mem;
1728
1729 // If the user specified one of these options, they
1730 // want specific memory sizing so do not limit memory
1731 // based on compressed oops addressability.
1732 // Also, memory limits will be calculated based on
1733 // available os physical memory, not our MaxRAM limit,
1734 // unless MaxRAM is also specified.
1735 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1736 !FLAG_IS_DEFAULT(MaxRAMFraction) ||
1737 !FLAG_IS_DEFAULT(MinRAMPercentage) ||
1738 !FLAG_IS_DEFAULT(MinRAMFraction) ||
1739 !FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1740 !FLAG_IS_DEFAULT(InitialRAMFraction) ||
1741 !FLAG_IS_DEFAULT(MaxRAM));
1742 if (override_coop_limit) {
1743 if (FLAG_IS_DEFAULT(MaxRAM)) {
1744 phys_mem = os::physical_memory();
1745 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1746 } else {
1747 phys_mem = (julong)MaxRAM;
1748 }
1749 } else {
1750 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1751 : (julong)MaxRAM;
1752 }
1753
1754
1755 // Convert deprecated flags
1756 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1757 !FLAG_IS_DEFAULT(MaxRAMFraction))
1758 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1759
1760 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1761 !FLAG_IS_DEFAULT(MinRAMFraction))
1762 MinRAMPercentage = 100.0 / MinRAMFraction;
1763
1764 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1765 !FLAG_IS_DEFAULT(InitialRAMFraction))
1766 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1767
1768 // If the maximum heap size has not been set with -Xmx,
1769 // then set it as fraction of the size of physical memory,
1770 // respecting the maximum and minimum sizes of the heap.
1771 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1772 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1773 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1774 if (reasonable_min < MaxHeapSize) {
1775 // Small physical memory, so use a minimum fraction of it for the heap
1776 reasonable_max = reasonable_min;
1777 } else {
1778 // Not-small physical memory, so require a heap at least
1779 // as large as MaxHeapSize
1780 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1781 }
1782
1783 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1784 // Limit the heap size to ErgoHeapSizeLimit
1785 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1786 }
1787
1788#ifdef _LP64
1789 if (UseCompressedOops) {
1790 // Limit the heap size to the maximum possible when using compressed oops
1791 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1792
1793 // HeapBaseMinAddress can be greater than default but not less than.
1794 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1795 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1796 // matches compressed oops printing flags
1797 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
1798 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
1799 DefaultHeapBaseMinAddress,
1800 DefaultHeapBaseMinAddress/G,
1801 HeapBaseMinAddress);
1802 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1803 }
1804 }
1805
1806 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1807 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1808 // but it should be not less than default MaxHeapSize.
1809 max_coop_heap -= HeapBaseMinAddress;
1810 }
1811
1812 // If user specified flags prioritizing os physical
1813 // memory limits, then disable compressed oops if
1814 // limits exceed max_coop_heap and UseCompressedOops
1815 // was not specified.
1816 if (reasonable_max > max_coop_heap) {
1817 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {
1818 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"
1819 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1820 "Please check the setting of MaxRAMPercentage %5.2f."
1821 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1822 FLAG_SET_ERGO(UseCompressedOops, false);
1823 FLAG_SET_ERGO(UseCompressedClassPointers, false);
1824 } else {
1825 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1826 }
1827 }
1828 }
1829#endif // _LP64
1830
1831 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1832
1833 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1834 // An initial heap size was specified on the command line,
1835 // so be sure that the maximum size is consistent. Done
1836 // after call to limit_by_allocatable_memory because that
1837 // method might reduce the allocation size.
1838 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1839 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
1840 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1841 }
1842
1843 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1844 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1845 }
1846
1847 // If the minimum or initial heap_size have not been set or requested to be set
1848 // ergonomically, set them accordingly.
1849 if (InitialHeapSize == 0 || MinHeapSize == 0) {
1850 julong reasonable_minimum = (julong)(OldSize + NewSize);
1851
1852 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1853
1854 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1855
1856 if (InitialHeapSize == 0) {
1857 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1858
1859 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1860 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1861
1862 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1863
1864 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1865 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);
1866 }
1867 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1868 // synchronize with InitialHeapSize to avoid errors with the default value.
1869 if (MinHeapSize == 0) {
1870 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1871 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);
1872 }
1873 }
1874}
1875
1876// This option inspects the machine and attempts to set various
1877// parameters to be optimal for long-running, memory allocation
1878// intensive jobs. It is intended for machines with large
1879// amounts of cpu and memory.
1880jint Arguments::set_aggressive_heap_flags() {
1881 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1882 // VM, but we may not be able to represent the total physical memory
1883 // available (like having 8gb of memory on a box but using a 32bit VM).
1884 // Thus, we need to make sure we're using a julong for intermediate
1885 // calculations.
1886 julong initHeapSize;
1887 julong total_memory = os::physical_memory();
1888
1889 if (total_memory < (julong) 256 * M) {
1890 jio_fprintf(defaultStream::error_stream(),
1891 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1892 vm_exit(1);
1893 }
1894
1895 // The heap size is half of available memory, or (at most)
1896 // all of possible memory less 160mb (leaving room for the OS
1897 // when using ISM). This is the maximum; because adaptive sizing
1898 // is turned on below, the actual space used may be smaller.
1899
1900 initHeapSize = MIN2(total_memory / (julong) 2,
1901 total_memory - (julong) 160 * M);
1902
1903 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1904
1905 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1906 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1907 return JNI_EINVAL;
1908 }
1909 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1910 return JNI_EINVAL;
1911 }
1912 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {
1913 return JNI_EINVAL;
1914 }
1915 }
1916 if (FLAG_IS_DEFAULT(NewSize)) {
1917 // Make the young generation 3/8ths of the total heap.
1918 if (FLAG_SET_CMDLINE(NewSize,
1919 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {
1920 return JNI_EINVAL;
1921 }
1922 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {
1923 return JNI_EINVAL;
1924 }
1925 }
1926
1927#if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1928 FLAG_SET_DEFAULT(UseLargePages, true);
1929#endif
1930
1931 // Increase some data structure sizes for efficiency
1932 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {
1933 return JNI_EINVAL;
1934 }
1935 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {
1936 return JNI_EINVAL;
1937 }
1938 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {
1939 return JNI_EINVAL;
1940 }
1941
1942 // See the OldPLABSize comment below, but replace 'after promotion'
1943 // with 'after copying'. YoungPLABSize is the size of the survivor
1944 // space per-gc-thread buffers. The default is 4kw.
1945 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1946 return JNI_EINVAL;
1947 }
1948
1949 // OldPLABSize is the size of the buffers in the old gen that
1950 // UseParallelGC uses to promote live data that doesn't fit in the
1951 // survivor spaces. At any given time, there's one for each gc thread.
1952 // The default size is 1kw. These buffers are rarely used, since the
1953 // survivor spaces are usually big enough. For specjbb, however, there
1954 // are occasions when there's lots of live data in the young gen
1955 // and we end up promoting some of it. We don't have a definite
1956 // explanation for why bumping OldPLABSize helps, but the theory
1957 // is that a bigger PLAB results in retaining something like the
1958 // original allocation order after promotion, which improves mutator
1959 // locality. A minor effect may be that larger PLABs reduce the
1960 // number of PLAB allocation events during gc. The value of 8kw
1961 // was arrived at by experimenting with specjbb.
1962 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words
1963 return JNI_EINVAL;
1964 }
1965
1966 // Enable parallel GC and adaptive generation sizing
1967 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {
1968 return JNI_EINVAL;
1969 }
1970
1971 // Encourage steady state memory management
1972 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {
1973 return JNI_EINVAL;
1974 }
1975
1976 // This appears to improve mutator locality
1977 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
1978 return JNI_EINVAL;
1979 }
1980
1981 // Get around early Solaris scheduling bug
1982 // (affinity vs other jobs on system)
1983 // but disallow DR and offlining (5008695).
1984 if (FLAG_SET_CMDLINE(BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) {
1985 return JNI_EINVAL;
1986 }
1987
1988 return JNI_OK;
1989}
1990
1991// This must be called after ergonomics.
1992void Arguments::set_bytecode_flags() {
1993 if (!RewriteBytecodes) {
1994 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1995 }
1996}
1997
1998// Aggressive optimization flags
1999jint Arguments::set_aggressive_opts_flags() {
2000#ifdef COMPILER2
2001 if (AggressiveUnboxing) {
2002 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2003 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2004 } else if (!EliminateAutoBox) {
2005 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2006 AggressiveUnboxing = false;
2007 }
2008 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2009 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2010 } else if (!DoEscapeAnalysis) {
2011 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2012 AggressiveUnboxing = false;
2013 }
2014 }
2015 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2016 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2017 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2018 }
2019 // Feed the cache size setting into the JDK
2020 char buffer[1024];
2021 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2022 if (!add_property(buffer)) {
2023 return JNI_ENOMEM;
2024 }
2025 }
2026#endif
2027
2028 return JNI_OK;
2029}
2030
2031//===========================================================================================================
2032// Parsing of java.compiler property
2033
2034void Arguments::process_java_compiler_argument(const char* arg) {
2035 // For backwards compatibility, Djava.compiler=NONE or ""
2036 // causes us to switch to -Xint mode UNLESS -Xdebug
2037 // is also specified.
2038 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2039 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2040 }
2041}
2042
2043void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2044 _sun_java_launcher = os::strdup_check_oom(launcher);
2045}
2046
2047bool Arguments::created_by_java_launcher() {
2048 assert(_sun_java_launcher != NULL, "property must have value");
2049 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2050}
2051
2052bool Arguments::sun_java_launcher_is_altjvm() {
2053 return _sun_java_launcher_is_altjvm;
2054}
2055
2056//===========================================================================================================
2057// Parsing of main arguments
2058
2059unsigned int addreads_count = 0;
2060unsigned int addexports_count = 0;
2061unsigned int addopens_count = 0;
2062unsigned int addmods_count = 0;
2063unsigned int patch_mod_count = 0;
2064
2065// Check the consistency of vm_init_args
2066bool Arguments::check_vm_args_consistency() {
2067 // Method for adding checks for flag consistency.
2068 // The intent is to warn the user of all possible conflicts,
2069 // before returning an error.
2070 // Note: Needs platform-dependent factoring.
2071 bool status = true;
2072
2073 if (TLABRefillWasteFraction == 0) {
2074 jio_fprintf(defaultStream::error_stream(),
2075 "TLABRefillWasteFraction should be a denominator, "
2076 "not " SIZE_FORMAT "\n",
2077 TLABRefillWasteFraction);
2078 status = false;
2079 }
2080
2081 if (PrintNMTStatistics) {
2082#if INCLUDE_NMT
2083 if (MemTracker::tracking_level() == NMT_off) {
2084#endif // INCLUDE_NMT
2085 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2086 PrintNMTStatistics = false;
2087#if INCLUDE_NMT
2088 }
2089#endif
2090 }
2091
2092 status = CompilerConfig::check_args_consistency(status);
2093#if INCLUDE_JVMCI
2094 if (status && EnableJVMCI) {
2095 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
2096 AddProperty, UnwriteableProperty, InternalProperty);
2097 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {
2098 return false;
2099 }
2100 }
2101#endif
2102
2103#ifndef SUPPORT_RESERVED_STACK_AREA
2104 if (StackReservedPages != 0) {
2105 FLAG_SET_CMDLINE(StackReservedPages, 0);
2106 warning("Reserved Stack Area not supported on this platform");
2107 }
2108#endif
2109
2110 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
2111 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) {
2112 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n");
2113 }
2114 }
2115
2116 status = status && GCArguments::check_args_consistency();
2117
2118 return status;
2119}
2120
2121bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2122 const char* option_type) {
2123 if (ignore) return false;
2124
2125 const char* spacer = " ";
2126 if (option_type == NULL) {
2127 option_type = ++spacer; // Set both to the empty string.
2128 }
2129
2130 jio_fprintf(defaultStream::error_stream(),
2131 "Unrecognized %s%soption: %s\n", option_type, spacer,
2132 option->optionString);
2133 return true;
2134}
2135
2136static const char* user_assertion_options[] = {
2137 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2138};
2139
2140static const char* system_assertion_options[] = {
2141 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2142};
2143
2144bool Arguments::parse_uintx(const char* value,
2145 uintx* uintx_arg,
2146 uintx min_size) {
2147
2148 // Check the sign first since atojulong() parses only unsigned values.
2149 bool value_is_positive = !(*value == '-');
2150
2151 if (value_is_positive) {
2152 julong n;
2153 bool good_return = atojulong(value, &n);
2154 if (good_return) {
2155 bool above_minimum = n >= min_size;
2156 bool value_is_too_large = n > max_uintx;
2157
2158 if (above_minimum && !value_is_too_large) {
2159 *uintx_arg = n;
2160 return true;
2161 }
2162 }
2163 }
2164 return false;
2165}
2166
2167bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {
2168 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
2169 char* property = AllocateHeap(prop_len, mtArguments);
2170 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
2171 if (ret < 0 || ret >= (int)prop_len) {
2172 FreeHeap(property);
2173 return false;
2174 }
2175 bool added = add_property(property, UnwriteableProperty, internal);
2176 FreeHeap(property);
2177 return added;
2178}
2179
2180bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) {
2181 const unsigned int props_count_limit = 1000;
2182 const int max_digits = 3;
2183 const int extra_symbols_count = 3; // includes '.', '=', '\0'
2184
2185 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
2186 if (count < props_count_limit) {
2187 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
2188 char* property = AllocateHeap(prop_len, mtArguments);
2189 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
2190 if (ret < 0 || ret >= (int)prop_len) {
2191 FreeHeap(property);
2192 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
2193 return false;
2194 }
2195 bool added = add_property(property, UnwriteableProperty, InternalProperty);
2196 FreeHeap(property);
2197 return added;
2198 }
2199
2200 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
2201 return false;
2202}
2203
2204Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2205 julong* long_arg,
2206 julong min_size,
2207 julong max_size) {
2208 if (!atojulong(s, long_arg)) return arg_unreadable;
2209 return check_memory_size(*long_arg, min_size, max_size);
2210}
2211
2212// Parse JavaVMInitArgs structure
2213
2214jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2215 const JavaVMInitArgs *java_options_args,
2216 const JavaVMInitArgs *cmd_line_args) {
2217 bool patch_mod_javabase = false;
2218
2219 // Save default settings for some mode flags
2220 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2221 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2222 Arguments::_ClipInlining = ClipInlining;
2223 Arguments::_BackgroundCompilation = BackgroundCompilation;
2224 if (TieredCompilation) {
2225 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2226 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2227 }
2228
2229 // Setup flags for mixed which is the default
2230 set_mode_flags(_mixed);
2231
2232 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2233 // variable (if present).
2234 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2235 if (result != JNI_OK) {
2236 return result;
2237 }
2238
2239 // Parse args structure generated from the command line flags.
2240 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE);
2241 if (result != JNI_OK) {
2242 return result;
2243 }
2244
2245 // Parse args structure generated from the _JAVA_OPTIONS environment
2246 // variable (if present) (mimics classic VM)
2247 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR);
2248 if (result != JNI_OK) {
2249 return result;
2250 }
2251
2252 // We need to ensure processor and memory resources have been properly
2253 // configured - which may rely on arguments we just processed - before
2254 // doing the final argument processing. Any argument processing that
2255 // needs to know about processor and memory resources must occur after
2256 // this point.
2257
2258 os::init_container_support();
2259
2260 // Do final processing now that all arguments have been parsed
2261 result = finalize_vm_init_args(patch_mod_javabase);
2262 if (result != JNI_OK) {
2263 return result;
2264 }
2265
2266 return JNI_OK;
2267}
2268
2269// Checks if name in command-line argument -agent{lib,path}:name[=options]
2270// represents a valid JDWP agent. is_path==true denotes that we
2271// are dealing with -agentpath (case where name is a path), otherwise with
2272// -agentlib
2273bool valid_jdwp_agent(char *name, bool is_path) {
2274 char *_name;
2275 const char *_jdwp = "jdwp";
2276 size_t _len_jdwp, _len_prefix;
2277
2278 if (is_path) {
2279 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2280 return false;
2281 }
2282
2283 _name++; // skip past last path separator
2284 _len_prefix = strlen(JNI_LIB_PREFIX);
2285
2286 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2287 return false;
2288 }
2289
2290 _name += _len_prefix;
2291 _len_jdwp = strlen(_jdwp);
2292
2293 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2294 _name += _len_jdwp;
2295 }
2296 else {
2297 return false;
2298 }
2299
2300 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2301 return false;
2302 }
2303
2304 return true;
2305 }
2306
2307 if (strcmp(name, _jdwp) == 0) {
2308 return true;
2309 }
2310
2311 return false;
2312}
2313
2314int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {
2315 // --patch-module=<module>=<file>(<pathsep><file>)*
2316 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value");
2317 // Find the equal sign between the module name and the path specification
2318 const char* module_equal = strchr(patch_mod_tail, '=');
2319 if (module_equal == NULL) {
2320 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2321 return JNI_ERR;
2322 } else {
2323 // Pick out the module name
2324 size_t module_len = module_equal - patch_mod_tail;
2325 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2326 if (module_name != NULL) {
2327 memcpy(module_name, patch_mod_tail, module_len);
2328 *(module_name + module_len) = '\0';
2329 // The path piece begins one past the module_equal sign
2330 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2331 FREE_C_HEAP_ARRAY(char, module_name);
2332 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {
2333 return JNI_ENOMEM;
2334 }
2335 } else {
2336 return JNI_ENOMEM;
2337 }
2338 }
2339 return JNI_OK;
2340}
2341
2342// Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2343jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {
2344 // The min and max sizes match the values in globals.hpp, but scaled
2345 // with K. The values have been chosen so that alignment with page
2346 // size doesn't change the max value, which makes the conversions
2347 // back and forth between Xss value and ThreadStackSize value easier.
2348 // The values have also been chosen to fit inside a 32-bit signed type.
2349 const julong min_ThreadStackSize = 0;
2350 const julong max_ThreadStackSize = 1 * M;
2351
2352 const julong min_size = min_ThreadStackSize * K;
2353 const julong max_size = max_ThreadStackSize * K;
2354
2355 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2356
2357 julong size = 0;
2358 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2359 if (errcode != arg_in_range) {
2360 bool silent = (option == NULL); // Allow testing to silence error messages
2361 if (!silent) {
2362 jio_fprintf(defaultStream::error_stream(),
2363 "Invalid thread stack size: %s\n", option->optionString);
2364 describe_range_error(errcode);
2365 }
2366 return JNI_EINVAL;
2367 }
2368
2369 // Internally track ThreadStackSize in units of 1024 bytes.
2370 const julong size_aligned = align_up(size, K);
2371 assert(size <= size_aligned,
2372 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2373 size, size_aligned);
2374
2375 const julong size_in_K = size_aligned / K;
2376 assert(size_in_K < (julong)max_intx,
2377 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2378 size_in_K);
2379
2380 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2381 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2382 assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2383 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2384 max_expanded, size_in_K);
2385
2386 *out_ThreadStackSize = (intx)size_in_K;
2387
2388 return JNI_OK;
2389}
2390
2391jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) {
2392 // For match_option to return remaining or value part of option string
2393 const char* tail;
2394
2395 // iterate over arguments
2396 for (int index = 0; index < args->nOptions; index++) {
2397 bool is_absolute_path = false; // for -agentpath vs -agentlib
2398
2399 const JavaVMOption* option = args->options + index;
2400
2401 if (!match_option(option, "-Djava.class.path", &tail) &&
2402 !match_option(option, "-Dsun.java.command", &tail) &&
2403 !match_option(option, "-Dsun.java.launcher", &tail)) {
2404
2405 // add all jvm options to the jvm_args string. This string
2406 // is used later to set the java.vm.args PerfData string constant.
2407 // the -Djava.class.path and the -Dsun.java.command options are
2408 // omitted from jvm_args string as each have their own PerfData
2409 // string constant object.
2410 build_jvm_args(option->optionString);
2411 }
2412
2413 // -verbose:[class/module/gc/jni]
2414 if (match_option(option, "-verbose", &tail)) {
2415 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2416 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2417 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2418 } else if (!strcmp(tail, ":module")) {
2419 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2420 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2421 } else if (!strcmp(tail, ":gc")) {
2422 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
2423 } else if (!strcmp(tail, ":jni")) {
2424 if (FLAG_SET_CMDLINE(PrintJNIResolving, true) != JVMFlag::SUCCESS) {
2425 return JNI_EINVAL;
2426 }
2427 }
2428 // -da / -ea / -disableassertions / -enableassertions
2429 // These accept an optional class/package name separated by a colon, e.g.,
2430 // -da:java.lang.Thread.
2431 } else if (match_option(option, user_assertion_options, &tail, true)) {
2432 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2433 if (*tail == '\0') {
2434 JavaAssertions::setUserClassDefault(enable);
2435 } else {
2436 assert(*tail == ':', "bogus match by match_option()");
2437 JavaAssertions::addOption(tail + 1, enable);
2438 }
2439 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2440 } else if (match_option(option, system_assertion_options, &tail, false)) {
2441 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2442 JavaAssertions::setSystemClassDefault(enable);
2443 // -bootclasspath:
2444 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2445 jio_fprintf(defaultStream::output_stream(),
2446 "-Xbootclasspath is no longer a supported option.\n");
2447 return JNI_EINVAL;
2448 // -bootclasspath/a:
2449 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2450 Arguments::append_sysclasspath(tail);
2451 // -bootclasspath/p:
2452 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2453 jio_fprintf(defaultStream::output_stream(),
2454 "-Xbootclasspath/p is no longer a supported option.\n");
2455 return JNI_EINVAL;
2456 // -Xrun
2457 } else if (match_option(option, "-Xrun", &tail)) {
2458 if (tail != NULL) {
2459 const char* pos = strchr(tail, ':');
2460 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2461 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2462 jio_snprintf(name, len + 1, "%s", tail);
2463
2464 char *options = NULL;
2465 if(pos != NULL) {
2466 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2467 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2468 }
2469#if !INCLUDE_JVMTI
2470 if (strcmp(name, "jdwp") == 0) {
2471 jio_fprintf(defaultStream::error_stream(),
2472 "Debugging agents are not supported in this VM\n");
2473 return JNI_ERR;
2474 }
2475#endif // !INCLUDE_JVMTI
2476 add_init_library(name, options);
2477 }
2478 } else if (match_option(option, "--add-reads=", &tail)) {
2479 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) {
2480 return JNI_ENOMEM;
2481 }
2482 } else if (match_option(option, "--add-exports=", &tail)) {
2483 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) {
2484 return JNI_ENOMEM;
2485 }
2486 } else if (match_option(option, "--add-opens=", &tail)) {
2487 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) {
2488 return JNI_ENOMEM;
2489 }
2490 } else if (match_option(option, "--add-modules=", &tail)) {
2491 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) {
2492 return JNI_ENOMEM;
2493 }
2494 } else if (match_option(option, "--limit-modules=", &tail)) {
2495 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) {
2496 return JNI_ENOMEM;
2497 }
2498 } else if (match_option(option, "--module-path=", &tail)) {
2499 if (!create_property("jdk.module.path", tail, ExternalProperty)) {
2500 return JNI_ENOMEM;
2501 }
2502 } else if (match_option(option, "--upgrade-module-path=", &tail)) {
2503 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) {
2504 return JNI_ENOMEM;
2505 }
2506 } else if (match_option(option, "--patch-module=", &tail)) {
2507 // --patch-module=<module>=<file>(<pathsep><file>)*
2508 int res = process_patch_mod_option(tail, patch_mod_javabase);
2509 if (res != JNI_OK) {
2510 return res;
2511 }
2512 } else if (match_option(option, "--illegal-access=", &tail)) {
2513 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) {
2514 return JNI_ENOMEM;
2515 }
2516 // -agentlib and -agentpath
2517 } else if (match_option(option, "-agentlib:", &tail) ||
2518 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2519 if(tail != NULL) {
2520 const char* pos = strchr(tail, '=');
2521 char* name;
2522 if (pos == NULL) {
2523 name = os::strdup_check_oom(tail, mtArguments);
2524 } else {
2525 size_t len = pos - tail;
2526 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2527 memcpy(name, tail, len);
2528 name[len] = '\0';
2529 }
2530
2531 char *options = NULL;
2532 if(pos != NULL) {
2533 options = os::strdup_check_oom(pos + 1, mtArguments);
2534 }
2535#if !INCLUDE_JVMTI
2536 if (valid_jdwp_agent(name, is_absolute_path)) {
2537 jio_fprintf(defaultStream::error_stream(),
2538 "Debugging agents are not supported in this VM\n");
2539 return JNI_ERR;
2540 }
2541#endif // !INCLUDE_JVMTI
2542 add_init_agent(name, options, is_absolute_path);
2543 }
2544 // -javaagent
2545 } else if (match_option(option, "-javaagent:", &tail)) {
2546#if !INCLUDE_JVMTI
2547 jio_fprintf(defaultStream::error_stream(),
2548 "Instrumentation agents are not supported in this VM\n");
2549 return JNI_ERR;
2550#else
2551 if (tail != NULL) {
2552 size_t length = strlen(tail) + 1;
2553 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2554 jio_snprintf(options, length, "%s", tail);
2555 add_instrument_agent("instrument", options, false);
2556 // java agents need module java.instrument
2557 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) {
2558 return JNI_ENOMEM;
2559 }
2560 }
2561#endif // !INCLUDE_JVMTI
2562 // --enable_preview
2563 } else if (match_option(option, "--enable-preview")) {
2564 set_enable_preview();
2565 // -Xnoclassgc
2566 } else if (match_option(option, "-Xnoclassgc")) {
2567 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {
2568 return JNI_EINVAL;
2569 }
2570 // -Xconcgc
2571 } else if (match_option(option, "-Xconcgc")) {
2572 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) {
2573 return JNI_EINVAL;
2574 }
2575 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC");
2576 // -Xnoconcgc
2577 } else if (match_option(option, "-Xnoconcgc")) {
2578 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) {
2579 return JNI_EINVAL;
2580 }
2581 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC");
2582 // -Xbatch
2583 } else if (match_option(option, "-Xbatch")) {
2584 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {
2585 return JNI_EINVAL;
2586 }
2587 // -Xmn for compatibility with other JVM vendors
2588 } else if (match_option(option, "-Xmn", &tail)) {
2589 julong long_initial_young_size = 0;
2590 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2591 if (errcode != arg_in_range) {
2592 jio_fprintf(defaultStream::error_stream(),
2593 "Invalid initial young generation size: %s\n", option->optionString);
2594 describe_range_error(errcode);
2595 return JNI_EINVAL;
2596 }
2597 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2598 return JNI_EINVAL;
2599 }
2600 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {
2601 return JNI_EINVAL;
2602 }
2603 // -Xms
2604 } else if (match_option(option, "-Xms", &tail)) {
2605 julong size = 0;
2606 // an initial heap size of 0 means automatically determine
2607 ArgsRange errcode = parse_memory_size(tail, &size, 0);
2608 if (errcode != arg_in_range) {
2609 jio_fprintf(defaultStream::error_stream(),
2610 "Invalid initial heap size: %s\n", option->optionString);
2611 describe_range_error(errcode);
2612 return JNI_EINVAL;
2613 }
2614 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2615 return JNI_EINVAL;
2616 }
2617 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {
2618 return JNI_EINVAL;
2619 }
2620 // -Xmx
2621 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2622 julong long_max_heap_size = 0;
2623 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2624 if (errcode != arg_in_range) {
2625 jio_fprintf(defaultStream::error_stream(),
2626 "Invalid maximum heap size: %s\n", option->optionString);
2627 describe_range_error(errcode);
2628 return JNI_EINVAL;
2629 }
2630 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {
2631 return JNI_EINVAL;
2632 }
2633 // Xmaxf
2634 } else if (match_option(option, "-Xmaxf", &tail)) {
2635 char* err;
2636 int maxf = (int)(strtod(tail, &err) * 100);
2637 if (*err != '\0' || *tail == '\0') {
2638 jio_fprintf(defaultStream::error_stream(),
2639 "Bad max heap free percentage size: %s\n",
2640 option->optionString);
2641 return JNI_EINVAL;
2642 } else {
2643 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {
2644 return JNI_EINVAL;
2645 }
2646 }
2647 // Xminf
2648 } else if (match_option(option, "-Xminf", &tail)) {
2649 char* err;
2650 int minf = (int)(strtod(tail, &err) * 100);
2651 if (*err != '\0' || *tail == '\0') {
2652 jio_fprintf(defaultStream::error_stream(),
2653 "Bad min heap free percentage size: %s\n",
2654 option->optionString);
2655 return JNI_EINVAL;
2656 } else {
2657 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {
2658 return JNI_EINVAL;
2659 }
2660 }
2661 // -Xss
2662 } else if (match_option(option, "-Xss", &tail)) {
2663 intx value = 0;
2664 jint err = parse_xss(option, tail, &value);
2665 if (err != JNI_OK) {
2666 return err;
2667 }
2668 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {
2669 return JNI_EINVAL;
2670 }
2671 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2672 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2673 julong long_ReservedCodeCacheSize = 0;
2674
2675 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2676 if (errcode != arg_in_range) {
2677 jio_fprintf(defaultStream::error_stream(),
2678 "Invalid maximum code cache size: %s.\n", option->optionString);
2679 return JNI_EINVAL;
2680 }
2681 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {
2682 return JNI_EINVAL;
2683 }
2684 // -green
2685 } else if (match_option(option, "-green")) {
2686 jio_fprintf(defaultStream::error_stream(),
2687 "Green threads support not available\n");
2688 return JNI_EINVAL;
2689 // -native
2690 } else if (match_option(option, "-native")) {
2691 // HotSpot always uses native threads, ignore silently for compatibility
2692 // -Xrs
2693 } else if (match_option(option, "-Xrs")) {
2694 // Classic/EVM option, new functionality
2695 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {
2696 return JNI_EINVAL;
2697 }
2698 // -Xprof
2699 } else if (match_option(option, "-Xprof")) {
2700 char version[256];
2701 // Obsolete in JDK 10
2702 JDK_Version::jdk(10).to_string(version, sizeof(version));
2703 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2704 // -Xinternalversion
2705 } else if (match_option(option, "-Xinternalversion")) {
2706 jio_fprintf(defaultStream::output_stream(), "%s\n",
2707 VM_Version::internal_vm_info_string());
2708 vm_exit(0);
2709#ifndef PRODUCT
2710 // -Xprintflags
2711 } else if (match_option(option, "-Xprintflags")) {
2712 JVMFlag::printFlags(tty, false);
2713 vm_exit(0);
2714#endif
2715 // -D
2716 } else if (match_option(option, "-D", &tail)) {
2717 const char* value;
2718 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2719 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2720 // abort if -Djava.endorsed.dirs is set
2721 jio_fprintf(defaultStream::output_stream(),
2722 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2723 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2724 return JNI_EINVAL;
2725 }
2726 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2727 *value != '\0' && strcmp(value, "\"\"") != 0) {
2728 // abort if -Djava.ext.dirs is set
2729 jio_fprintf(defaultStream::output_stream(),
2730 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2731 return JNI_EINVAL;
2732 }
2733 // Check for module related properties. They must be set using the modules
2734 // options. For example: use "--add-modules=java.sql", not
2735 // "-Djdk.module.addmods=java.sql"
2736 if (is_internal_module_property(option->optionString + 2)) {
2737 needs_module_property_warning = true;
2738 continue;
2739 }
2740
2741 if (!add_property(tail)) {
2742 return JNI_ENOMEM;
2743 }
2744 // Out of the box management support
2745 if (match_option(option, "-Dcom.sun.management", &tail)) {
2746#if INCLUDE_MANAGEMENT
2747 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {
2748 return JNI_EINVAL;
2749 }
2750 // management agent in module jdk.management.agent
2751 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {
2752 return JNI_ENOMEM;
2753 }
2754#else
2755 jio_fprintf(defaultStream::output_stream(),
2756 "-Dcom.sun.management is not supported in this VM.\n");
2757 return JNI_ERR;
2758#endif
2759 }
2760 // -Xint
2761 } else if (match_option(option, "-Xint")) {
2762 set_mode_flags(_int);
2763 // -Xmixed
2764 } else if (match_option(option, "-Xmixed")) {
2765 set_mode_flags(_mixed);
2766 // -Xcomp
2767 } else if (match_option(option, "-Xcomp")) {
2768 // for testing the compiler; turn off all flags that inhibit compilation
2769 set_mode_flags(_comp);
2770 // -Xshare:dump
2771 } else if (match_option(option, "-Xshare:dump")) {
2772 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) {
2773 return JNI_EINVAL;
2774 }
2775 // -Xshare:on
2776 } else if (match_option(option, "-Xshare:on")) {
2777 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2778 return JNI_EINVAL;
2779 }
2780 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
2781 return JNI_EINVAL;
2782 }
2783 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2784 } else if (match_option(option, "-Xshare:auto")) {
2785 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
2786 return JNI_EINVAL;
2787 }
2788 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2789 return JNI_EINVAL;
2790 }
2791 // -Xshare:off
2792 } else if (match_option(option, "-Xshare:off")) {
2793 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) {
2794 return JNI_EINVAL;
2795 }
2796 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) {
2797 return JNI_EINVAL;
2798 }
2799 // -Xverify
2800 } else if (match_option(option, "-Xverify", &tail)) {
2801 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2802 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {
2803 return JNI_EINVAL;
2804 }
2805 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2806 return JNI_EINVAL;
2807 }
2808 } else if (strcmp(tail, ":remote") == 0) {
2809 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2810 return JNI_EINVAL;
2811 }
2812 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {
2813 return JNI_EINVAL;
2814 }
2815 } else if (strcmp(tail, ":none") == 0) {
2816 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {
2817 return JNI_EINVAL;
2818 }
2819 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {
2820 return JNI_EINVAL;
2821 }
2822 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");
2823 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2824 return JNI_EINVAL;
2825 }
2826 // -Xdebug
2827 } else if (match_option(option, "-Xdebug")) {
2828 // note this flag has been used, then ignore
2829 set_xdebug_mode(true);
2830 // -Xnoagent
2831 } else if (match_option(option, "-Xnoagent")) {
2832 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2833 } else if (match_option(option, "-Xloggc:", &tail)) {
2834 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2835 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);
2836 _gc_log_filename = os::strdup_check_oom(tail);
2837 } else if (match_option(option, "-Xlog", &tail)) {
2838 bool ret = false;
2839 if (strcmp(tail, ":help") == 0) {
2840 fileStream stream(defaultStream::output_stream());
2841 LogConfiguration::print_command_line_help(&stream);
2842 vm_exit(0);
2843 } else if (strcmp(tail, ":disable") == 0) {
2844 LogConfiguration::disable_logging();
2845 ret = true;
2846 } else if (*tail == '\0') {
2847 ret = LogConfiguration::parse_command_line_arguments();
2848 assert(ret, "-Xlog without arguments should never fail to parse");
2849 } else if (*tail == ':') {
2850 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2851 }
2852 if (ret == false) {
2853 jio_fprintf(defaultStream::error_stream(),
2854 "Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2855 tail);
2856 return JNI_EINVAL;
2857 }
2858 // JNI hooks
2859 } else if (match_option(option, "-Xcheck", &tail)) {
2860 if (!strcmp(tail, ":jni")) {
2861#if !INCLUDE_JNI_CHECK
2862 warning("JNI CHECKING is not supported in this VM");
2863#else
2864 CheckJNICalls = true;
2865#endif // INCLUDE_JNI_CHECK
2866 } else if (is_bad_option(option, args->ignoreUnrecognized,
2867 "check")) {
2868 return JNI_EINVAL;
2869 }
2870 } else if (match_option(option, "vfprintf")) {
2871 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2872 } else if (match_option(option, "exit")) {
2873 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2874 } else if (match_option(option, "abort")) {
2875 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2876 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2877 // and the last option wins.
2878 } else if (match_option(option, "-XX:+NeverTenure")) {
2879 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {
2880 return JNI_EINVAL;
2881 }
2882 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2883 return JNI_EINVAL;
2884 }
2885 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) {
2886 return JNI_EINVAL;
2887 }
2888 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2889 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2890 return JNI_EINVAL;
2891 }
2892 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2893 return JNI_EINVAL;
2894 }
2895 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {
2896 return JNI_EINVAL;
2897 }
2898 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2899 uintx max_tenuring_thresh = 0;
2900 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2901 jio_fprintf(defaultStream::error_stream(),
2902 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2903 return JNI_EINVAL;
2904 }
2905
2906 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {
2907 return JNI_EINVAL;
2908 }
2909
2910 if (MaxTenuringThreshold == 0) {
2911 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2912 return JNI_EINVAL;
2913 }
2914 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {
2915 return JNI_EINVAL;
2916 }
2917 } else {
2918 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {
2919 return JNI_EINVAL;
2920 }
2921 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {
2922 return JNI_EINVAL;
2923 }
2924 }
2925 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2926 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {
2927 return JNI_EINVAL;
2928 }
2929 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {
2930 return JNI_EINVAL;
2931 }
2932 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
2933 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {
2934 return JNI_EINVAL;
2935 }
2936 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {
2937 return JNI_EINVAL;
2938 }
2939 } else if (match_option(option, "-XX:+ErrorFileToStderr")) {
2940 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {
2941 return JNI_EINVAL;
2942 }
2943 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {
2944 return JNI_EINVAL;
2945 }
2946 } else if (match_option(option, "-XX:+ErrorFileToStdout")) {
2947 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {
2948 return JNI_EINVAL;
2949 }
2950 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {
2951 return JNI_EINVAL;
2952 }
2953 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
2954#if defined(DTRACE_ENABLED)
2955 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) {
2956 return JNI_EINVAL;
2957 }
2958 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) {
2959 return JNI_EINVAL;
2960 }
2961 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) {
2962 return JNI_EINVAL;
2963 }
2964 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) {
2965 return JNI_EINVAL;
2966 }
2967#else // defined(DTRACE_ENABLED)
2968 jio_fprintf(defaultStream::error_stream(),
2969 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2970 return JNI_EINVAL;
2971#endif // defined(DTRACE_ENABLED)
2972#ifdef ASSERT
2973 } else if (match_option(option, "-XX:+FullGCALot")) {
2974 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {
2975 return JNI_EINVAL;
2976 }
2977 // disable scavenge before parallel mark-compact
2978 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) {
2979 return JNI_EINVAL;
2980 }
2981#endif
2982#if !INCLUDE_MANAGEMENT
2983 } else if (match_option(option, "-XX:+ManagementServer")) {
2984 jio_fprintf(defaultStream::error_stream(),
2985 "ManagementServer is not supported in this VM.\n");
2986 return JNI_ERR;
2987#endif // INCLUDE_MANAGEMENT
2988#if INCLUDE_JFR
2989 } else if (match_jfr_option(&option)) {
2990 return JNI_EINVAL;
2991#endif
2992 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2993 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2994 // already been handled
2995 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
2996 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
2997 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2998 return JNI_EINVAL;
2999 }
3000 }
3001 // Unknown option
3002 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3003 return JNI_ERR;
3004 }
3005 }
3006
3007 // PrintSharedArchiveAndExit will turn on
3008 // -Xshare:on
3009 // -Xlog:class+path=info
3010 if (PrintSharedArchiveAndExit) {
3011 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) {
3012 return JNI_EINVAL;
3013 }
3014 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) {
3015 return JNI_EINVAL;
3016 }
3017 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
3018 }
3019
3020 fix_appclasspath();
3021
3022 return JNI_OK;
3023}
3024
3025void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {
3026 // For java.base check for duplicate --patch-module options being specified on the command line.
3027 // This check is only required for java.base, all other duplicate module specifications
3028 // will be checked during module system initialization. The module system initialization
3029 // will throw an ExceptionInInitializerError if this situation occurs.
3030 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
3031 if (*patch_mod_javabase) {
3032 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");
3033 } else {
3034 *patch_mod_javabase = true;
3035 }
3036 }
3037
3038 // Create GrowableArray lazily, only if --patch-module has been specified
3039 if (_patch_mod_prefix == NULL) {
3040 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true);
3041 }
3042
3043 _patch_mod_prefix->push(new ModulePatchPath(module_name, path));
3044}
3045
3046// Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3047//
3048// This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3049// in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3050// Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3051// path is treated as the current directory.
3052//
3053// This causes problems with CDS, which requires that all directories specified in the classpath
3054// must be empty. In most cases, applications do NOT want to load classes from the current
3055// directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3056// scripts compatible with CDS.
3057void Arguments::fix_appclasspath() {
3058 if (IgnoreEmptyClassPaths) {
3059 const char separator = *os::path_separator();
3060 const char* src = _java_class_path->value();
3061
3062 // skip over all the leading empty paths
3063 while (*src == separator) {
3064 src ++;
3065 }
3066
3067 char* copy = os::strdup_check_oom(src, mtArguments);
3068
3069 // trim all trailing empty paths
3070 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3071 *tail = '\0';
3072 }
3073
3074 char from[3] = {separator, separator, '\0'};
3075 char to [2] = {separator, '\0'};
3076 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3077 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3078 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3079 }
3080
3081 _java_class_path->set_writeable_value(copy);
3082 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3083 }
3084}
3085
3086jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {
3087 // check if the default lib/endorsed directory exists; if so, error
3088 char path[JVM_MAXPATHLEN];
3089 const char* fileSep = os::file_separator();
3090 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3091
3092 DIR* dir = os::opendir(path);
3093 if (dir != NULL) {
3094 jio_fprintf(defaultStream::output_stream(),
3095 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3096 "in modular form will be supported via the concept of upgradeable modules.\n");
3097 os::closedir(dir);
3098 return JNI_ERR;
3099 }
3100
3101 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3102 dir = os::opendir(path);
3103 if (dir != NULL) {
3104 jio_fprintf(defaultStream::output_stream(),
3105 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3106 "Use -classpath instead.\n.");
3107 os::closedir(dir);
3108 return JNI_ERR;
3109 }
3110
3111 // This must be done after all arguments have been processed
3112 // and the container support has been initialized since AggressiveHeap
3113 // relies on the amount of total memory available.
3114 if (AggressiveHeap) {
3115 jint result = set_aggressive_heap_flags();
3116 if (result != JNI_OK) {
3117 return result;
3118 }
3119 }
3120
3121 // This must be done after all arguments have been processed.
3122 // java_compiler() true means set to "NONE" or empty.
3123 if (java_compiler() && !xdebug_mode()) {
3124 // For backwards compatibility, we switch to interpreted mode if
3125 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3126 // not specified.
3127 set_mode_flags(_int);
3128 }
3129
3130 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3131 // but like -Xint, leave compilation thresholds unaffected.
3132 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3133 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3134 set_mode_flags(_int);
3135 }
3136
3137 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3138 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3139 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
3140 }
3141
3142#if !COMPILER2_OR_JVMCI
3143 // Don't degrade server performance for footprint
3144 if (FLAG_IS_DEFAULT(UseLargePages) &&
3145 MaxHeapSize < LargePageHeapSizeThreshold) {
3146 // No need for large granularity pages w/small heaps.
3147 // Note that large pages are enabled/disabled for both the
3148 // Java heap and the code cache.
3149 FLAG_SET_DEFAULT(UseLargePages, false);
3150 }
3151
3152 UNSUPPORTED_OPTION(ProfileInterpreter);
3153 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter));
3154#endif
3155
3156#ifndef TIERED
3157 // Tiered compilation is undefined.
3158 UNSUPPORTED_OPTION(TieredCompilation);
3159#endif
3160
3161 if (!check_vm_args_consistency()) {
3162 return JNI_ERR;
3163 }
3164
3165#if INCLUDE_CDS
3166 if (DumpSharedSpaces) {
3167 // Disable biased locking now as it interferes with the clean up of
3168 // the archived Klasses and Java string objects (at dump time only).
3169 UseBiasedLocking = false;
3170
3171 // Compiler threads may concurrently update the class metadata (such as method entries), so it's
3172 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable
3173 // compiler just to be safe.
3174 //
3175 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata
3176 // instead of modifying them in place. The copy is inaccessible to the compiler.
3177 // TODO: revisit the following for the static archive case.
3178 set_mode_flags(_int);
3179 }
3180 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) {
3181 // Always verify non-system classes during CDS dump
3182 if (!BytecodeVerificationRemote) {
3183 BytecodeVerificationRemote = true;
3184 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time.");
3185 }
3186 }
3187 if (ArchiveClassesAtExit == NULL) {
3188 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false);
3189 }
3190 if (UseSharedSpaces && patch_mod_javabase) {
3191 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched.");
3192 }
3193 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) {
3194 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3195 }
3196#endif
3197
3198#ifndef CAN_SHOW_REGISTERS_ON_ASSERT
3199 UNSUPPORTED_OPTION(ShowRegistersOnAssert);
3200#endif // CAN_SHOW_REGISTERS_ON_ASSERT
3201
3202 return JNI_OK;
3203}
3204
3205// Helper class for controlling the lifetime of JavaVMInitArgs
3206// objects. The contents of the JavaVMInitArgs are guaranteed to be
3207// deleted on the destruction of the ScopedVMInitArgs object.
3208class ScopedVMInitArgs : public StackObj {
3209 private:
3210 JavaVMInitArgs _args;
3211 char* _container_name;
3212 bool _is_set;
3213 char* _vm_options_file_arg;
3214
3215 public:
3216 ScopedVMInitArgs(const char *container_name) {
3217 _args.version = JNI_VERSION_1_2;
3218 _args.nOptions = 0;
3219 _args.options = NULL;
3220 _args.ignoreUnrecognized = false;
3221 _container_name = (char *)container_name;
3222 _is_set = false;
3223 _vm_options_file_arg = NULL;
3224 }
3225
3226 // Populates the JavaVMInitArgs object represented by this
3227 // ScopedVMInitArgs object with the arguments in options. The
3228 // allocated memory is deleted by the destructor. If this method
3229 // returns anything other than JNI_OK, then this object is in a
3230 // partially constructed state, and should be abandoned.
3231 jint set_args(GrowableArray<JavaVMOption>* options) {
3232 _is_set = true;
3233 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3234 JavaVMOption, options->length(), mtArguments);
3235 if (options_arr == NULL) {
3236 return JNI_ENOMEM;
3237 }
3238 _args.options = options_arr;
3239
3240 for (int i = 0; i < options->length(); i++) {
3241 options_arr[i] = options->at(i);
3242 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3243 if (options_arr[i].optionString == NULL) {
3244 // Rely on the destructor to do cleanup.
3245 _args.nOptions = i;
3246 return JNI_ENOMEM;
3247 }
3248 }
3249
3250 _args.nOptions = options->length();
3251 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3252 return JNI_OK;
3253 }
3254
3255 JavaVMInitArgs* get() { return &_args; }
3256 char* container_name() { return _container_name; }
3257 bool is_set() { return _is_set; }
3258 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; }
3259 char* vm_options_file_arg() { return _vm_options_file_arg; }
3260
3261 void set_vm_options_file_arg(const char *vm_options_file_arg) {
3262 if (_vm_options_file_arg != NULL) {
3263 os::free(_vm_options_file_arg);
3264 }
3265 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3266 }
3267
3268 ~ScopedVMInitArgs() {
3269 if (_vm_options_file_arg != NULL) {
3270 os::free(_vm_options_file_arg);
3271 }
3272 if (_args.options == NULL) return;
3273 for (int i = 0; i < _args.nOptions; i++) {
3274 os::free(_args.options[i].optionString);
3275 }
3276 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3277 }
3278
3279 // Insert options into this option list, to replace option at
3280 // vm_options_file_pos (-XX:VMOptionsFile)
3281 jint insert(const JavaVMInitArgs* args,
3282 const JavaVMInitArgs* args_to_insert,
3283 const int vm_options_file_pos) {
3284 assert(_args.options == NULL, "shouldn't be set yet");
3285 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3286 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3287
3288 int length = args->nOptions + args_to_insert->nOptions - 1;
3289 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments)
3290 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3291 for (int i = 0; i < args->nOptions; i++) {
3292 if (i == vm_options_file_pos) {
3293 // insert the new options starting at the same place as the
3294 // -XX:VMOptionsFile option
3295 for (int j = 0; j < args_to_insert->nOptions; j++) {
3296 options->push(args_to_insert->options[j]);
3297 }
3298 } else {
3299 options->push(args->options[i]);
3300 }
3301 }
3302 // make into options array
3303 jint result = set_args(options);
3304 delete options;
3305 return result;
3306 }
3307};
3308
3309jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3310 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3311}
3312
3313jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3314 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3315}
3316
3317jint Arguments::parse_options_environment_variable(const char* name,
3318 ScopedVMInitArgs* vm_args) {
3319 char *buffer = ::getenv(name);
3320
3321 // Don't check this environment variable if user has special privileges
3322 // (e.g. unix su command).
3323 if (buffer == NULL || os::have_special_privileges()) {
3324 return JNI_OK;
3325 }
3326
3327 if ((buffer = os::strdup(buffer)) == NULL) {
3328 return JNI_ENOMEM;
3329 }
3330
3331 jio_fprintf(defaultStream::error_stream(),
3332 "Picked up %s: %s\n", name, buffer);
3333
3334 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3335
3336 os::free(buffer);
3337 return retcode;
3338}
3339
3340jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3341 // read file into buffer
3342 int fd = ::open(file_name, O_RDONLY);
3343 if (fd < 0) {
3344 jio_fprintf(defaultStream::error_stream(),
3345 "Could not open options file '%s'\n",
3346 file_name);
3347 return JNI_ERR;
3348 }
3349
3350 struct stat stbuf;
3351 int retcode = os::stat(file_name, &stbuf);
3352 if (retcode != 0) {
3353 jio_fprintf(defaultStream::error_stream(),
3354 "Could not stat options file '%s'\n",
3355 file_name);
3356 os::close(fd);
3357 return JNI_ERR;
3358 }
3359
3360 if (stbuf.st_size == 0) {
3361 // tell caller there is no option data and that is ok
3362 os::close(fd);
3363 return JNI_OK;
3364 }
3365
3366 // '+ 1' for NULL termination even with max bytes
3367 size_t bytes_alloc = stbuf.st_size + 1;
3368
3369 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3370 if (NULL == buf) {
3371 jio_fprintf(defaultStream::error_stream(),
3372 "Could not allocate read buffer for options file parse\n");
3373 os::close(fd);
3374 return JNI_ENOMEM;
3375 }
3376
3377 memset(buf, 0, bytes_alloc);
3378
3379 // Fill buffer
3380 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc);
3381 os::close(fd);
3382 if (bytes_read < 0) {
3383 FREE_C_HEAP_ARRAY(char, buf);
3384 jio_fprintf(defaultStream::error_stream(),
3385 "Could not read options file '%s'\n", file_name);
3386 return JNI_ERR;
3387 }
3388
3389 if (bytes_read == 0) {
3390 // tell caller there is no option data and that is ok
3391 FREE_C_HEAP_ARRAY(char, buf);
3392 return JNI_OK;
3393 }
3394
3395 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3396
3397 FREE_C_HEAP_ARRAY(char, buf);
3398 return retcode;
3399}
3400
3401jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3402 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array
3403
3404 // some pointers to help with parsing
3405 char *buffer_end = buffer + buf_len;
3406 char *opt_hd = buffer;
3407 char *wrt = buffer;
3408 char *rd = buffer;
3409
3410 // parse all options
3411 while (rd < buffer_end) {
3412 // skip leading white space from the input string
3413 while (rd < buffer_end && isspace(*rd)) {
3414 rd++;
3415 }
3416
3417 if (rd >= buffer_end) {
3418 break;
3419 }
3420
3421 // Remember this is where we found the head of the token.
3422 opt_hd = wrt;
3423
3424 // Tokens are strings of non white space characters separated
3425 // by one or more white spaces.
3426 while (rd < buffer_end && !isspace(*rd)) {
3427 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3428 int quote = *rd; // matching quote to look for
3429 rd++; // don't copy open quote
3430 while (rd < buffer_end && *rd != quote) {
3431 // include everything (even spaces)
3432 // up until the close quote
3433 *wrt++ = *rd++; // copy to option string
3434 }
3435
3436 if (rd < buffer_end) {
3437 rd++; // don't copy close quote
3438 } else {
3439 // did not see closing quote
3440 jio_fprintf(defaultStream::error_stream(),
3441 "Unmatched quote in %s\n", name);
3442 delete options;
3443 return JNI_ERR;
3444 }
3445 } else {
3446 *wrt++ = *rd++; // copy to option string
3447 }
3448 }
3449
3450 // steal a white space character and set it to NULL
3451 *wrt++ = '\0';
3452 // We now have a complete token
3453
3454 JavaVMOption option;
3455 option.optionString = opt_hd;
3456 option.extraInfo = NULL;
3457
3458 options->append(option); // Fill in option
3459
3460 rd++; // Advance to next character
3461 }
3462
3463 // Fill out JavaVMInitArgs structure.
3464 jint status = vm_args->set_args(options);
3465
3466 delete options;
3467 return status;
3468}
3469
3470void Arguments::set_shared_spaces_flags() {
3471 if (DumpSharedSpaces) {
3472 if (FailOverToOldVerifier) {
3473 // Don't fall back to the old verifier on verification failure. If a
3474 // class fails verification with the split verifier, it might fail the
3475 // CDS runtime verifier constraint check. In that case, we don't want
3476 // to share the class. We only archive classes that pass the split verifier.
3477 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3478 }
3479
3480 if (RequireSharedSpaces) {
3481 warning("Cannot dump shared archive while using shared archive");
3482 }
3483 UseSharedSpaces = false;
3484#ifdef _LP64
3485 if (!UseCompressedOops || !UseCompressedClassPointers) {
3486 vm_exit_during_initialization(
3487 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3488 }
3489 } else {
3490 if (!UseCompressedOops || !UseCompressedClassPointers) {
3491 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3492 }
3493#endif
3494 }
3495}
3496
3497#if INCLUDE_CDS
3498// Sharing support
3499// Construct the path to the archive
3500char* Arguments::get_default_shared_archive_path() {
3501 char *default_archive_path;
3502 char jvm_path[JVM_MAXPATHLEN];
3503 os::jvm_path(jvm_path, sizeof(jvm_path));
3504 char *end = strrchr(jvm_path, *os::file_separator());
3505 if (end != NULL) *end = '\0';
3506 size_t jvm_path_len = strlen(jvm_path);
3507 size_t file_sep_len = strlen(os::file_separator());
3508 const size_t len = jvm_path_len + file_sep_len + 20;
3509 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments);
3510 if (default_archive_path != NULL) {
3511 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa",
3512 jvm_path, os::file_separator());
3513 }
3514 return default_archive_path;
3515}
3516
3517int Arguments::num_archives(const char* archive_path) {
3518 if (archive_path == NULL) {
3519 return 0;
3520 }
3521 int npaths = 1;
3522 char* p = (char*)archive_path;
3523 while (*p != '\0') {
3524 if (*p == os::path_separator()[0]) {
3525 npaths++;
3526 }
3527 p++;
3528 }
3529 return npaths;
3530}
3531
3532void Arguments::extract_shared_archive_paths(const char* archive_path,
3533 char** base_archive_path,
3534 char** top_archive_path) {
3535 char* begin_ptr = (char*)archive_path;
3536 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]);
3537 if (end_ptr == NULL || end_ptr == begin_ptr) {
3538 vm_exit_during_initialization("Base archive was not specified", archive_path);
3539 }
3540 size_t len = end_ptr - begin_ptr;
3541 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3542 strncpy(cur_path, begin_ptr, len);
3543 cur_path[len] = '\0';
3544 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/);
3545 *base_archive_path = cur_path;
3546
3547 begin_ptr = ++end_ptr;
3548 if (*begin_ptr == '\0') {
3549 vm_exit_during_initialization("Top archive was not specified", archive_path);
3550 }
3551 end_ptr = strchr(begin_ptr, '\0');
3552 assert(end_ptr != NULL, "sanity");
3553 len = end_ptr - begin_ptr;
3554 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal);
3555 strncpy(cur_path, begin_ptr, len + 1);
3556 //cur_path[len] = '\0';
3557 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/);
3558 *top_archive_path = cur_path;
3559}
3560
3561bool Arguments::init_shared_archive_paths() {
3562 if (ArchiveClassesAtExit != NULL) {
3563 if (DumpSharedSpaces) {
3564 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump");
3565 }
3566 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) {
3567 return false;
3568 }
3569 check_unsupported_dumping_properties();
3570 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments);
3571 }
3572 if (SharedArchiveFile == NULL) {
3573 SharedArchivePath = get_default_shared_archive_path();
3574 } else {
3575 int archives = num_archives(SharedArchiveFile);
3576 if (DynamicDumpSharedSpaces || DumpSharedSpaces) {
3577 if (archives > 1) {
3578 vm_exit_during_initialization(
3579 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping");
3580 }
3581 if (DynamicDumpSharedSpaces) {
3582 if (FileMapInfo::same_files(SharedArchiveFile, ArchiveClassesAtExit)) {
3583 vm_exit_during_initialization(
3584 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit",
3585 SharedArchiveFile);
3586 }
3587 }
3588 }
3589 if (!DynamicDumpSharedSpaces && !DumpSharedSpaces){
3590 if (archives > 2) {
3591 vm_exit_during_initialization(
3592 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option");
3593 }
3594 if (archives == 1) {
3595 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3596 int name_size;
3597 bool success =
3598 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath);
3599 if (!success) {
3600 SharedArchivePath = temp_archive_path;
3601 } else {
3602 SharedDynamicArchivePath = temp_archive_path;
3603 }
3604 } else {
3605 extract_shared_archive_paths((const char*)SharedArchiveFile,
3606 &SharedArchivePath, &SharedDynamicArchivePath);
3607 }
3608 } else { // CDS dumping
3609 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments);
3610 }
3611 }
3612 return (SharedArchivePath != NULL);
3613}
3614#endif // INCLUDE_CDS
3615
3616#ifndef PRODUCT
3617// Determine whether LogVMOutput should be implicitly turned on.
3618static bool use_vm_log() {
3619 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3620 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3621 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3622 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3623 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3624 return true;
3625 }
3626
3627#ifdef COMPILER1
3628 if (PrintC1Statistics) {
3629 return true;
3630 }
3631#endif // COMPILER1
3632
3633#ifdef COMPILER2
3634 if (PrintOptoAssembly || PrintOptoStatistics) {
3635 return true;
3636 }
3637#endif // COMPILER2
3638
3639 return false;
3640}
3641
3642#endif // PRODUCT
3643
3644bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {
3645 for (int index = 0; index < args->nOptions; index++) {
3646 const JavaVMOption* option = args->options + index;
3647 const char* tail;
3648 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3649 return true;
3650 }
3651 }
3652 return false;
3653}
3654
3655jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3656 const char* vm_options_file,
3657 const int vm_options_file_pos,
3658 ScopedVMInitArgs* vm_options_file_args,
3659 ScopedVMInitArgs* args_out) {
3660 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3661 if (code != JNI_OK) {
3662 return code;
3663 }
3664
3665 if (vm_options_file_args->get()->nOptions < 1) {
3666 return JNI_OK;
3667 }
3668
3669 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {
3670 jio_fprintf(defaultStream::error_stream(),
3671 "A VM options file may not refer to a VM options file. "
3672 "Specification of '-XX:VMOptionsFile=<file-name>' in the "
3673 "options file '%s' in options container '%s' is an error.\n",
3674 vm_options_file_args->vm_options_file_arg(),
3675 vm_options_file_args->container_name());
3676 return JNI_EINVAL;
3677 }
3678
3679 return args_out->insert(args, vm_options_file_args->get(),
3680 vm_options_file_pos);
3681}
3682
3683// Expand -XX:VMOptionsFile found in args_in as needed.
3684// mod_args and args_out parameters may return values as needed.
3685jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3686 ScopedVMInitArgs* mod_args,
3687 JavaVMInitArgs** args_out) {
3688 jint code = match_special_option_and_act(args_in, mod_args);
3689 if (code != JNI_OK) {
3690 return code;
3691 }
3692
3693 if (mod_args->is_set()) {
3694 // args_in contains -XX:VMOptionsFile and mod_args contains the
3695 // original options from args_in along with the options expanded
3696 // from the VMOptionsFile. Return a short-hand to the caller.
3697 *args_out = mod_args->get();
3698 } else {
3699 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3700 }
3701 return JNI_OK;
3702}
3703
3704jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3705 ScopedVMInitArgs* args_out) {
3706 // Remaining part of option string
3707 const char* tail;
3708 ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3709
3710 for (int index = 0; index < args->nOptions; index++) {
3711 const JavaVMOption* option = args->options + index;
3712 if (match_option(option, "-XX:Flags=", &tail)) {
3713 Arguments::set_jvm_flags_file(tail);
3714 continue;
3715 }
3716 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3717 if (vm_options_file_args.found_vm_options_file_arg()) {
3718 jio_fprintf(defaultStream::error_stream(),
3719 "The option '%s' is already specified in the options "
3720 "container '%s' so the specification of '%s' in the "
3721 "same options container is an error.\n",
3722 vm_options_file_args.vm_options_file_arg(),
3723 vm_options_file_args.container_name(),
3724 option->optionString);
3725 return JNI_EINVAL;
3726 }
3727 vm_options_file_args.set_vm_options_file_arg(option->optionString);
3728 // If there's a VMOptionsFile, parse that
3729 jint code = insert_vm_options_file(args, tail, index,
3730 &vm_options_file_args, args_out);
3731 if (code != JNI_OK) {
3732 return code;
3733 }
3734 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3735 if (args_out->is_set()) {
3736 // The VMOptions file inserted some options so switch 'args'
3737 // to the new set of options, and continue processing which
3738 // preserves "last option wins" semantics.
3739 args = args_out->get();
3740 // The first option from the VMOptionsFile replaces the
3741 // current option. So we back track to process the
3742 // replacement option.
3743 index--;
3744 }
3745 continue;
3746 }
3747 if (match_option(option, "-XX:+PrintVMOptions")) {
3748 PrintVMOptions = true;
3749 continue;
3750 }
3751 if (match_option(option, "-XX:-PrintVMOptions")) {
3752 PrintVMOptions = false;
3753 continue;
3754 }
3755 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3756 IgnoreUnrecognizedVMOptions = true;
3757 continue;
3758 }
3759 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3760 IgnoreUnrecognizedVMOptions = false;
3761 continue;
3762 }
3763 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3764 JVMFlag::printFlags(tty, false);
3765 vm_exit(0);
3766 }
3767 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3768#if INCLUDE_NMT
3769 // The launcher did not setup nmt environment variable properly.
3770 if (!MemTracker::check_launcher_nmt_support(tail)) {
3771 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3772 }
3773
3774 // Verify if nmt option is valid.
3775 if (MemTracker::verify_nmt_option()) {
3776 // Late initialization, still in single-threaded mode.
3777 if (MemTracker::tracking_level() >= NMT_summary) {
3778 MemTracker::init();
3779 }
3780 } else {
3781 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3782 }
3783 continue;
3784#else
3785 jio_fprintf(defaultStream::error_stream(),
3786 "Native Memory Tracking is not supported in this VM\n");
3787 return JNI_ERR;
3788#endif
3789 }
3790
3791#ifndef PRODUCT
3792 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3793 JVMFlag::printFlags(tty, true);
3794 vm_exit(0);
3795 }
3796#endif
3797 }
3798 return JNI_OK;
3799}
3800
3801static void print_options(const JavaVMInitArgs *args) {
3802 const char* tail;
3803 for (int index = 0; index < args->nOptions; index++) {
3804 const JavaVMOption *option = args->options + index;
3805 if (match_option(option, "-XX:", &tail)) {
3806 logOption(tail);
3807 }
3808 }
3809}
3810
3811bool Arguments::handle_deprecated_print_gc_flags() {
3812 if (PrintGC) {
3813 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");
3814 }
3815 if (PrintGCDetails) {
3816 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");
3817 }
3818
3819 if (_gc_log_filename != NULL) {
3820 // -Xloggc was used to specify a filename
3821 const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3822
3823 LogTarget(Error, logging) target;
3824 LogStream errstream(target);
3825 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream);
3826 } else if (PrintGC || PrintGCDetails) {
3827 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3828 }
3829 return true;
3830}
3831
3832void Arguments::handle_extra_cms_flags(const char* msg) {
3833 SpecialFlag flag;
3834 const char *flag_name = "UseConcMarkSweepGC";
3835 if (lookup_special_flag(flag_name, flag)) {
3836 handle_aliases_and_deprecation(flag_name, /* print warning */ true);
3837 warning("%s", msg);
3838 }
3839}
3840
3841// Parse entry point called from JNI_CreateJavaVM
3842
3843jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
3844 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent");
3845
3846 // Initialize ranges, constraints and writeables
3847 JVMFlagRangeList::init();
3848 JVMFlagConstraintList::init();
3849 JVMFlagWriteableList::init();
3850
3851 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3852 const char* hotspotrc = ".hotspotrc";
3853 bool settings_file_specified = false;
3854 bool needs_hotspotrc_warning = false;
3855 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3856 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");
3857
3858 // Pointers to current working set of containers
3859 JavaVMInitArgs* cur_cmd_args;
3860 JavaVMInitArgs* cur_java_options_args;
3861 JavaVMInitArgs* cur_java_tool_options_args;
3862
3863 // Containers for modified/expanded options
3864 ScopedVMInitArgs mod_cmd_args("cmd_line_args");
3865 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");
3866 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");
3867
3868
3869 jint code =
3870 parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3871 if (code != JNI_OK) {
3872 return code;
3873 }
3874
3875 code = parse_java_options_environment_variable(&initial_java_options_args);
3876 if (code != JNI_OK) {
3877 return code;
3878 }
3879
3880 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3881 &mod_java_tool_options_args,
3882 &cur_java_tool_options_args);
3883 if (code != JNI_OK) {
3884 return code;
3885 }
3886
3887 code = expand_vm_options_as_needed(initial_cmd_args,
3888 &mod_cmd_args,
3889 &cur_cmd_args);
3890 if (code != JNI_OK) {
3891 return code;
3892 }
3893
3894 code = expand_vm_options_as_needed(initial_java_options_args.get(),
3895 &mod_java_options_args,
3896 &cur_java_options_args);
3897 if (code != JNI_OK) {
3898 return code;
3899 }
3900
3901 const char* flags_file = Arguments::get_jvm_flags_file();
3902 settings_file_specified = (flags_file != NULL);
3903
3904 if (IgnoreUnrecognizedVMOptions) {
3905 cur_cmd_args->ignoreUnrecognized = true;
3906 cur_java_tool_options_args->ignoreUnrecognized = true;
3907 cur_java_options_args->ignoreUnrecognized = true;
3908 }
3909
3910 // Parse specified settings file
3911 if (settings_file_specified) {
3912 if (!process_settings_file(flags_file, true,
3913 cur_cmd_args->ignoreUnrecognized)) {
3914 return JNI_EINVAL;
3915 }
3916 } else {
3917#ifdef ASSERT
3918 // Parse default .hotspotrc settings file
3919 if (!process_settings_file(".hotspotrc", false,
3920 cur_cmd_args->ignoreUnrecognized)) {
3921 return JNI_EINVAL;
3922 }
3923#else
3924 struct stat buf;
3925 if (os::stat(hotspotrc, &buf) == 0) {
3926 needs_hotspotrc_warning = true;
3927 }
3928#endif
3929 }
3930
3931 if (PrintVMOptions) {
3932 print_options(cur_java_tool_options_args);
3933 print_options(cur_cmd_args);
3934 print_options(cur_java_options_args);
3935 }
3936
3937 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3938 jint result = parse_vm_init_args(cur_java_tool_options_args,
3939 cur_java_options_args,
3940 cur_cmd_args);
3941
3942 if (result != JNI_OK) {
3943 return result;
3944 }
3945
3946#if INCLUDE_CDS
3947 // Initialize shared archive paths which could include both base and dynamic archive paths
3948 if (!init_shared_archive_paths()) {
3949 return JNI_ENOMEM;
3950 }
3951#endif
3952
3953 // Delay warning until here so that we've had a chance to process
3954 // the -XX:-PrintWarnings flag
3955 if (needs_hotspotrc_warning) {
3956 warning("%s file is present but has been ignored. "
3957 "Run with -XX:Flags=%s to load the file.",
3958 hotspotrc, hotspotrc);
3959 }
3960
3961 if (needs_module_property_warning) {
3962 warning("Ignoring system property options whose names match the '-Djdk.module.*'."
3963 " names that are reserved for internal use.");
3964 }
3965
3966#if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3967 UNSUPPORTED_OPTION(UseLargePages);
3968#endif
3969
3970#if defined(AIX)
3971 UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3972 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt);
3973#endif
3974
3975#ifndef PRODUCT
3976 if (TraceBytecodesAt != 0) {
3977 TraceBytecodes = true;
3978 }
3979 if (CountCompiledCalls) {
3980 if (UseCounterDecay) {
3981 warning("UseCounterDecay disabled because CountCalls is set");
3982 UseCounterDecay = false;
3983 }
3984 }
3985#endif // PRODUCT
3986
3987 if (ScavengeRootsInCode == 0) {
3988 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3989 warning("Forcing ScavengeRootsInCode non-zero");
3990 }
3991 ScavengeRootsInCode = 1;
3992 }
3993
3994 if (!handle_deprecated_print_gc_flags()) {
3995 return JNI_EINVAL;
3996 }
3997
3998 // Set object alignment values.
3999 set_object_alignment();
4000
4001#if !INCLUDE_CDS
4002 if (DumpSharedSpaces || RequireSharedSpaces) {
4003 jio_fprintf(defaultStream::error_stream(),
4004 "Shared spaces are not supported in this VM\n");
4005 return JNI_ERR;
4006 }
4007 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) ||
4008 log_is_enabled(Info, cds)) {
4009 warning("Shared spaces are not supported in this VM");
4010 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4011 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
4012 }
4013 no_shared_spaces("CDS Disabled");
4014#endif // INCLUDE_CDS
4015
4016 return JNI_OK;
4017}
4018
4019jint Arguments::apply_ergo() {
4020 // Set flags based on ergonomics.
4021 jint result = set_ergonomics_flags();
4022 if (result != JNI_OK) return result;
4023
4024 // Set heap size based on available physical memory
4025 set_heap_size();
4026
4027 GCConfig::arguments()->initialize();
4028
4029 set_shared_spaces_flags();
4030
4031 // Initialize Metaspace flags and alignments
4032 Metaspace::ergo_initialize();
4033
4034 // Set compiler flags after GC is selected and GC specific
4035 // flags (LoopStripMiningIter) are set.
4036 CompilerConfig::ergo_initialize();
4037
4038 // Set bytecode rewriting flags
4039 set_bytecode_flags();
4040
4041 // Set flags if aggressive optimization flags are enabled
4042 jint code = set_aggressive_opts_flags();
4043 if (code != JNI_OK) {
4044 return code;
4045 }
4046
4047 // Turn off biased locking for locking debug mode flags,
4048 // which are subtly different from each other but neither works with
4049 // biased locking
4050 if (UseHeavyMonitors
4051#ifdef COMPILER1
4052 || !UseFastLocking
4053#endif // COMPILER1
4054#if INCLUDE_JVMCI
4055 || !JVMCIUseFastLocking
4056#endif
4057 ) {
4058 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4059 // flag set to true on command line; warn the user that they
4060 // can't enable biased locking here
4061 warning("Biased Locking is not supported with locking debug flags"
4062 "; ignoring UseBiasedLocking flag." );
4063 }
4064 UseBiasedLocking = false;
4065 }
4066
4067#ifdef CC_INTERP
4068 // Clear flags not supported on zero.
4069 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4070 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4071 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4072 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4073#endif // CC_INTERP
4074
4075 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4076 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4077 DebugNonSafepoints = true;
4078 }
4079
4080 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4081 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4082 }
4083
4084 // Treat the odd case where local verification is enabled but remote
4085 // verification is not as if both were enabled.
4086 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {
4087 log_info(verification)("Turning on remote verification because local verification is on");
4088 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
4089 }
4090
4091#ifndef PRODUCT
4092 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4093 if (use_vm_log()) {
4094 LogVMOutput = true;
4095 }
4096 }
4097#endif // PRODUCT
4098
4099 if (PrintCommandLineFlags) {
4100 JVMFlag::printSetFlags(tty);
4101 }
4102
4103 // Apply CPU specific policy for the BiasedLocking
4104 if (UseBiasedLocking) {
4105 if (!VM_Version::use_biased_locking() &&
4106 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4107 UseBiasedLocking = false;
4108 }
4109 }
4110#ifdef COMPILER2
4111 if (!UseBiasedLocking) {
4112 UseOptoBiasInlining = false;
4113 }
4114#endif
4115
4116#if defined(IA32)
4117 // Only server compiler can optimize safepoints well enough.
4118 if (!is_server_compilation_mode_vm()) {
4119 FLAG_SET_ERGO_IF_DEFAULT(ThreadLocalHandshakes, false);
4120 }
4121#endif
4122
4123 // ThreadLocalHandshakesConstraintFunc handles the constraints.
4124 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) {
4125 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4126 } else {
4127 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled.");
4128 }
4129
4130 return JNI_OK;
4131}
4132
4133jint Arguments::adjust_after_os() {
4134 if (UseNUMA) {
4135 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
4136 FLAG_SET_ERGO(UseNUMA, false);
4137 } else if (UseParallelGC || UseParallelOldGC) {
4138 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4139 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4140 }
4141 }
4142 // UseNUMAInterleaving is set to ON for all collectors and
4143 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4144 // such as the parallel collector for Linux and Solaris will
4145 // interleave old gen and survivor spaces on top of NUMA
4146 // allocation policy for the eden space.
4147 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4148 // all platforms and ParallelGC on Windows will interleave all
4149 // of the heap spaces across NUMA nodes.
4150 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4151 FLAG_SET_ERGO(UseNUMAInterleaving, true);
4152 }
4153 }
4154 return JNI_OK;
4155}
4156
4157int Arguments::PropertyList_count(SystemProperty* pl) {
4158 int count = 0;
4159 while(pl != NULL) {
4160 count++;
4161 pl = pl->next();
4162 }
4163 return count;
4164}
4165
4166// Return the number of readable properties.
4167int Arguments::PropertyList_readable_count(SystemProperty* pl) {
4168 int count = 0;
4169 while(pl != NULL) {
4170 if (pl->is_readable()) {
4171 count++;
4172 }
4173 pl = pl->next();
4174 }
4175 return count;
4176}
4177
4178const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4179 assert(key != NULL, "just checking");
4180 SystemProperty* prop;
4181 for (prop = pl; prop != NULL; prop = prop->next()) {
4182 if (strcmp(key, prop->key()) == 0) return prop->value();
4183 }
4184 return NULL;
4185}
4186
4187// Return the value of the requested property provided that it is a readable property.
4188const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {
4189 assert(key != NULL, "just checking");
4190 SystemProperty* prop;
4191 // Return the property value if the keys match and the property is not internal or
4192 // it's the special internal property "jdk.boot.class.path.append".
4193 for (prop = pl; prop != NULL; prop = prop->next()) {
4194 if (strcmp(key, prop->key()) == 0) {
4195 if (!prop->internal()) {
4196 return prop->value();
4197 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) {
4198 return prop->value();
4199 } else {
4200 // Property is internal and not jdk.boot.class.path.append so return NULL.
4201 return NULL;
4202 }
4203 }
4204 }
4205 return NULL;
4206}
4207
4208const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4209 int count = 0;
4210 const char* ret_val = NULL;
4211
4212 while(pl != NULL) {
4213 if(count >= index) {
4214 ret_val = pl->key();
4215 break;
4216 }
4217 count++;
4218 pl = pl->next();
4219 }
4220
4221 return ret_val;
4222}
4223
4224char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4225 int count = 0;
4226 char* ret_val = NULL;
4227
4228 while(pl != NULL) {
4229 if(count >= index) {
4230 ret_val = pl->value();
4231 break;
4232 }
4233 count++;
4234 pl = pl->next();
4235 }
4236
4237 return ret_val;
4238}
4239
4240void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4241 SystemProperty* p = *plist;
4242 if (p == NULL) {
4243 *plist = new_p;
4244 } else {
4245 while (p->next() != NULL) {
4246 p = p->next();
4247 }
4248 p->set_next(new_p);
4249 }
4250}
4251
4252void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
4253 bool writeable, bool internal) {
4254 if (plist == NULL)
4255 return;
4256
4257 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
4258 PropertyList_add(plist, new_p);
4259}
4260
4261void Arguments::PropertyList_add(SystemProperty *element) {
4262 PropertyList_add(&_system_properties, element);
4263}
4264
4265// This add maintains unique property key in the list.
4266void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
4267 PropertyAppendable append, PropertyWriteable writeable,
4268 PropertyInternal internal) {
4269 if (plist == NULL)
4270 return;
4271
4272 // If property key exist then update with new value.
4273 SystemProperty* prop;
4274 for (prop = *plist; prop != NULL; prop = prop->next()) {
4275 if (strcmp(k, prop->key()) == 0) {
4276 if (append == AppendProperty) {
4277 prop->append_value(v);
4278 } else {
4279 prop->set_value(v);
4280 }
4281 return;
4282 }
4283 }
4284
4285 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
4286}
4287
4288// Copies src into buf, replacing "%%" with "%" and "%p" with pid
4289// Returns true if all of the source pointed by src has been copied over to
4290// the destination buffer pointed by buf. Otherwise, returns false.
4291// Notes:
4292// 1. If the length (buflen) of the destination buffer excluding the
4293// NULL terminator character is not long enough for holding the expanded
4294// pid characters, it also returns false instead of returning the partially
4295// expanded one.
4296// 2. The passed in "buflen" should be large enough to hold the null terminator.
4297bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4298 char* buf, size_t buflen) {
4299 const char* p = src;
4300 char* b = buf;
4301 const char* src_end = &src[srclen];
4302 char* buf_end = &buf[buflen - 1];
4303
4304 while (p < src_end && b < buf_end) {
4305 if (*p == '%') {
4306 switch (*(++p)) {
4307 case '%': // "%%" ==> "%"
4308 *b++ = *p++;
4309 break;
4310 case 'p': { // "%p" ==> current process id
4311 // buf_end points to the character before the last character so
4312 // that we could write '\0' to the end of the buffer.
4313 size_t buf_sz = buf_end - b + 1;
4314 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4315
4316 // if jio_snprintf fails or the buffer is not long enough to hold
4317 // the expanded pid, returns false.
4318 if (ret < 0 || ret >= (int)buf_sz) {
4319 return false;
4320 } else {
4321 b += ret;
4322 assert(*b == '\0', "fail in copy_expand_pid");
4323 if (p == src_end && b == buf_end + 1) {
4324 // reach the end of the buffer.
4325 return true;
4326 }
4327 }
4328 p++;
4329 break;
4330 }
4331 default :
4332 *b++ = '%';
4333 }
4334 } else {
4335 *b++ = *p++;
4336 }
4337 }
4338 *b = '\0';
4339 return (p == src_end); // return false if not all of the source was copied
4340}
4341