2
* Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5
* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
7
* published by the Free Software Foundation.
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* 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).
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* 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.
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* 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
25
#include "precompiled.hpp"
26
#include "cds/cds_globals.hpp"
27
#include "cds/cdsConfig.hpp"
28
#include "cds/filemap.hpp"
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#include "classfile/classLoader.hpp"
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#include "classfile/javaAssertions.hpp"
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#include "classfile/moduleEntry.hpp"
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#include "classfile/stringTable.hpp"
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#include "classfile/symbolTable.hpp"
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#include "compiler/compilerDefinitions.hpp"
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#include "gc/shared/gcArguments.hpp"
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#include "gc/shared/gcConfig.hpp"
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#include "gc/shared/genArguments.hpp"
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#include "gc/shared/stringdedup/stringDedup.hpp"
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#include "gc/shared/tlab_globals.hpp"
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#include "logging/log.hpp"
42
#include "logging/logConfiguration.hpp"
43
#include "logging/logStream.hpp"
44
#include "logging/logTag.hpp"
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#include "memory/allocation.inline.hpp"
46
#include "nmt/nmtCommon.hpp"
47
#include "oops/compressedKlass.hpp"
48
#include "oops/instanceKlass.hpp"
49
#include "oops/oop.inline.hpp"
50
#include "prims/jvmtiAgentList.hpp"
51
#include "prims/jvmtiExport.hpp"
52
#include "runtime/arguments.hpp"
53
#include "runtime/flags/jvmFlag.hpp"
54
#include "runtime/flags/jvmFlagAccess.hpp"
55
#include "runtime/flags/jvmFlagLimit.hpp"
56
#include "runtime/globals_extension.hpp"
57
#include "runtime/java.hpp"
58
#include "runtime/os.hpp"
59
#include "runtime/safepoint.hpp"
60
#include "runtime/safepointMechanism.hpp"
61
#include "runtime/synchronizer.hpp"
62
#include "runtime/vm_version.hpp"
63
#include "services/management.hpp"
64
#include "utilities/align.hpp"
65
#include "utilities/checkedCast.hpp"
66
#include "utilities/debug.hpp"
67
#include "utilities/defaultStream.hpp"
68
#include "utilities/macros.hpp"
69
#include "utilities/parseInteger.hpp"
70
#include "utilities/powerOfTwo.hpp"
71
#include "utilities/stringUtils.hpp"
72
#include "utilities/systemMemoryBarrier.hpp"
79
static const char _default_java_launcher[] = "generic";
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#define DEFAULT_JAVA_LAUNCHER _default_java_launcher
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char* Arguments::_jvm_flags_file = nullptr;
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char** Arguments::_jvm_flags_array = nullptr;
85
int Arguments::_num_jvm_flags = 0;
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char** Arguments::_jvm_args_array = nullptr;
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int Arguments::_num_jvm_args = 0;
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char* Arguments::_java_command = nullptr;
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SystemProperty* Arguments::_system_properties = nullptr;
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size_t Arguments::_conservative_max_heap_alignment = 0;
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Arguments::Mode Arguments::_mode = _mixed;
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const char* Arguments::_java_vendor_url_bug = nullptr;
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const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
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bool Arguments::_sun_java_launcher_is_altjvm = false;
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// These parameters are reset in method parse_vm_init_args()
97
bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
98
bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
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bool Arguments::_BackgroundCompilation = BackgroundCompilation;
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bool Arguments::_ClipInlining = ClipInlining;
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size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
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bool Arguments::_enable_preview = false;
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LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 };107
// These are not set by the JDK's built-in launchers, but they can be set by
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// programs that embed the JVM using JNI_CreateJavaVM. See comments around
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// JavaVMOption in jni.h.
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abort_hook_t Arguments::_abort_hook = nullptr;
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exit_hook_t Arguments::_exit_hook = nullptr;
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vfprintf_hook_t Arguments::_vfprintf_hook = nullptr;
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SystemProperty *Arguments::_sun_boot_library_path = nullptr;
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SystemProperty *Arguments::_java_library_path = nullptr;
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SystemProperty *Arguments::_java_home = nullptr;
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SystemProperty *Arguments::_java_class_path = nullptr;
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SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr;
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SystemProperty *Arguments::_vm_info = nullptr;
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GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr;
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PathString *Arguments::_boot_class_path = nullptr;
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bool Arguments::_has_jimage = false;
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char* Arguments::_ext_dirs = nullptr;
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// True if -Xshare:auto option was specified.
129
static bool xshare_auto_cmd_line = false;
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// True if -Xint/-Xmixed/-Xcomp were specified
132
static bool mode_flag_cmd_line = false;
134
bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {135
char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
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if (new_value == nullptr) {137
assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
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if (_value != nullptr) {144
strcpy(_value, value);
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void PathString::append_value(const char *value) {151
if (value != nullptr) {153
if (_value != nullptr) {154
len += strlen(_value);
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sp = AllocateHeap(len+2, mtArguments);
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assert(sp != nullptr, "Unable to allocate space for new append path value");
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if (_value != nullptr) {161
strcat(sp, os::path_separator());
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PathString::PathString(const char* value) {173
if (value == nullptr) {176
_value = AllocateHeap(strlen(value)+1, mtArguments);
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strcpy(_value, value);
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PathString::~PathString() {182
if (_value != nullptr) {188
ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {189
assert(module_name != nullptr && path != nullptr, "Invalid module name or path value");
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size_t len = strlen(module_name) + 1;
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_module_name = AllocateHeap(len, mtInternal);
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strncpy(_module_name, module_name, len); // copy the trailing null
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_path = new PathString(path);
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ModulePatchPath::~ModulePatchPath() {197
if (_module_name != nullptr) {198
FreeHeap(_module_name);
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_module_name = nullptr;
201
if (_path != nullptr) {207
SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {208
if (key == nullptr) {211
_key = AllocateHeap(strlen(key)+1, mtArguments);
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_internal = internal;
216
_writeable = writeable;
219
// Check if head of 'option' matches 'name', and sets 'tail' to the remaining
220
// part of the option string.
221
static bool match_option(const JavaVMOption *option, const char* name,
223
size_t len = strlen(name);
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if (strncmp(option->optionString, name, len) == 0) {225
*tail = option->optionString + len;
232
// Check if 'option' matches 'name'. No "tail" is allowed.
233
static bool match_option(const JavaVMOption *option, const char* name) {234
const char* tail = nullptr;
235
bool result = match_option(option, name, &tail);
236
if (tail != nullptr && *tail == '\0') {243
// Return true if any of the strings in null-terminated array 'names' matches.
244
// If tail_allowed is true, then the tail must begin with a colon; otherwise,
245
// the option must match exactly.
246
static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
248
for (/* empty */; *names != nullptr; ++names) {249
if (match_option(option, *names, tail)) {250
if (**tail == '\0' || (tail_allowed && **tail == ':')) {259
static bool _has_jfr_option = false; // is using JFR
261
// return true on failure
262
static bool match_jfr_option(const JavaVMOption** option) {263
assert((*option)->optionString != nullptr, "invariant");
264
char* tail = nullptr;
265
if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {266
_has_jfr_option = true;
267
return Jfr::on_start_flight_recording_option(option, tail);
268
} else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {269
_has_jfr_option = true;
270
return Jfr::on_flight_recorder_option(option, tail);
275
bool Arguments::has_jfr_option() {276
return _has_jfr_option;
280
static void logOption(const char* opt) {281
if (PrintVMOptions) {282
jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
286
bool needs_module_property_warning = false;
288
#define MODULE_PROPERTY_PREFIX "jdk.module."
289
#define MODULE_PROPERTY_PREFIX_LEN 11
290
#define ADDEXPORTS "addexports"
291
#define ADDEXPORTS_LEN 10
292
#define ADDREADS "addreads"
293
#define ADDREADS_LEN 8
294
#define ADDOPENS "addopens"
295
#define ADDOPENS_LEN 8
298
#define ADDMODS "addmods"
300
#define LIMITMODS "limitmods"
301
#define LIMITMODS_LEN 9
304
#define UPGRADE_PATH "upgrade.path"
305
#define UPGRADE_PATH_LEN 12
306
#define ENABLE_NATIVE_ACCESS "enable.native.access"
307
#define ENABLE_NATIVE_ACCESS_LEN 20
309
// Return TRUE if option matches 'property', or 'property=', or 'property.'.
310
static bool matches_property_suffix(const char* option, const char* property, size_t len) {311
return ((strncmp(option, property, len) == 0) &&
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(option[len] == '=' || option[len] == '.' || option[len] == '\0'));
315
// Return true if property starts with "jdk.module." and its ensuing chars match
316
// any of the reserved module properties.
317
// property should be passed without the leading "-D".
318
bool Arguments::is_internal_module_property(const char* property) {319
if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {320
const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
321
if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
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matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
323
matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
324
matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
325
matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
326
matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
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matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
328
matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
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matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {336
// Process java launcher properties.
337
void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {338
// See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
339
// Must do this before setting up other system properties,
340
// as some of them may depend on launcher type.
341
for (int index = 0; index < args->nOptions; index++) {342
const JavaVMOption* option = args->options + index;
345
if (match_option(option, "-Dsun.java.launcher=", &tail)) {346
process_java_launcher_argument(tail, option->extraInfo);
349
if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {350
if (strcmp(tail, "true") == 0) {351
_sun_java_launcher_is_altjvm = true;
358
// Initialize system properties key and value.
359
void Arguments::init_system_properties() {361
// Set up _boot_class_path which is not a property but
362
// relies heavily on argument processing and the jdk.boot.class.path.append
363
// property. It is used to store the underlying boot class path.
364
_boot_class_path = new PathString(nullptr);
366
PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",367
"Java Virtual Machine Specification", false));
368
PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));369
PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));370
PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));372
// Initialize the vm.info now, but it will need updating after argument parsing.
373
_vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);375
// Following are JVMTI agent writable properties.
376
// Properties values are set to nullptr and they are
377
// os specific they are initialized in os::init_system_properties_values().
378
_sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true);379
_java_library_path = new SystemProperty("java.library.path", nullptr, true);380
_java_home = new SystemProperty("java.home", nullptr, true);381
_java_class_path = new SystemProperty("java.class.path", "", true);382
// jdk.boot.class.path.append is a non-writeable, internal property.
383
// It can only be set by either:
384
// - -Xbootclasspath/a:
385
// - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
386
_jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true);388
// Add to System Property list.
389
PropertyList_add(&_system_properties, _sun_boot_library_path);
390
PropertyList_add(&_system_properties, _java_library_path);
391
PropertyList_add(&_system_properties, _java_home);
392
PropertyList_add(&_system_properties, _java_class_path);
393
PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
394
PropertyList_add(&_system_properties, _vm_info);
396
// Set OS specific system properties values
397
os::init_system_properties_values();
400
// Update/Initialize System properties after JDK version number is known
401
void Arguments::init_version_specific_system_properties() {404
const char* spec_vendor = "Oracle Corporation";
405
uint32_t spec_version = JDK_Version::current().major_version();
407
jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
409
PropertyList_add(&_system_properties,
410
new SystemProperty("java.vm.specification.vendor", spec_vendor, false));411
PropertyList_add(&_system_properties,
412
new SystemProperty("java.vm.specification.version", buffer, false));413
PropertyList_add(&_system_properties,
414
new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));418
* -XX argument processing:
420
* -XX arguments are defined in several places, such as:
421
* globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
422
* -XX arguments are parsed in parse_argument().
423
* -XX argument bounds checking is done in check_vm_args_consistency().
425
* Over time -XX arguments may change. There are mechanisms to handle common cases:
427
* ALIASED: An option that is simply another name for another option. This is often
428
* part of the process of deprecating a flag, but not all aliases need
431
* Create an alias for an option by adding the old and new option names to the
432
* "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
434
* DEPRECATED: An option that is supported, but a warning is printed to let the user know that
435
* support may be removed in the future. Both regular and aliased options may be
438
* Add a deprecation warning for an option (or alias) by adding an entry in the
439
* "special_jvm_flags" table and setting the "deprecated_in" field.
440
* Often an option "deprecated" in one major release will
441
* be made "obsolete" in the next. In this case the entry should also have its
442
* "obsolete_in" field set.
444
* OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
445
* on the command line. A warning is printed to let the user know that option might not
446
* be accepted in the future.
448
* Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
449
* table and setting the "obsolete_in" field.
451
* EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
452
* to the current JDK version. The system will flatly refuse to admit the existence of
453
* the flag. This allows a flag to die automatically over JDK releases.
455
* Note that manual cleanup of expired options should be done at major JDK version upgrades:
456
* - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
457
* - Newly obsolete or expired deprecated options should have their global variable
458
* definitions removed (from globals.hpp, etc) and related implementations removed.
460
* Recommended approach for removing options:
462
* To remove options commonly used by customers (e.g. product -XX options), use
463
* the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
465
* To remove internal options (e.g. diagnostic, experimental, develop options), use
466
* a 2-step model adding major release numbers to the obsolete and expire columns.
468
* To change the name of an option, use the alias table as well as a 2-step
469
* model adding major release numbers to the deprecate and expire columns.
470
* Think twice about aliasing commonly used customer options.
472
* There are times when it is appropriate to leave a future release number as undefined.
474
* Tests: Aliases should be tested in VMAliasOptions.java.
475
* Deprecated options should be tested in VMDeprecatedOptions.java.
478
// The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
479
// "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
480
// When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
481
// the command-line as usual, but will issue a warning.
482
// When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
483
// the command-line, while issuing a warning and ignoring the flag value.
484
// Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
485
// existence of the flag.
487
// MANUAL CLEANUP ON JDK VERSION UPDATES:
488
// This table ensures that the handling of options will update automatically when the JDK
489
// version is incremented, but the source code needs to be cleanup up manually:
490
// - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
491
// variable should be removed, as well as users of the variable.
492
// - As "deprecated" options age into "obsolete" options, move the entry into the
493
// "Obsolete Flags" section of the table.
494
// - All expired options should be removed from the table.
495
static SpecialFlag const special_jvm_flags[] = {496
// -------------- Deprecated Flags --------------
497
// --- Non-alias flags - sorted by obsolete_in then expired_in:
498
{ "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },499
{ "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },500
{ "ZGenerational", JDK_Version::jdk(23), JDK_Version::undefined(), JDK_Version::undefined() },501
{ "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },502
{ "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },503
{ "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },504
{ "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },505
{ "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },506
{ "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },507
{ "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) },508
// --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
509
{ "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },511
// -------------- Obsolete Flags - sorted by expired_in --------------
513
{ "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() },515
{ "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },516
{ "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },517
{ "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },519
{ "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },520
{ "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },521
{ "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) },524
{ "HeapFirstMaximumCompactionCount", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },525
{ "UseVtableBasedCHA", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) },527
{ "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },530
#ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
531
// These entries will generate build errors. Their purpose is to test the macros.
532
{ "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },533
{ "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },534
{ "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },535
{ "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },536
{ "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },537
{ "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },538
{ "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },541
{ nullptr, JDK_Version(0), JDK_Version(0) }544
// Flags that are aliases for other flags.
546
const char* alias_name;
547
const char* real_name;
550
static AliasedFlag const aliased_jvm_flags[] = {551
{ "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },555
// Return true if "v" is less than "other", where "other" may be "undefined".
556
static bool version_less_than(JDK_Version v, JDK_Version other) {557
assert(!v.is_undefined(), "must be defined");
558
if (!other.is_undefined() && v.compare(other) >= 0) {565
static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {566
for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {567
if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {568
flag = special_jvm_flags[i];
575
bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {576
assert(version != nullptr, "Must provide a version buffer");
578
if (lookup_special_flag(flag_name, flag)) {579
if (!flag.obsolete_in.is_undefined()) {580
if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {581
*version = flag.obsolete_in;
582
// This flag may have been marked for obsoletion in this version, but we may not
583
// have actually removed it yet. Rather than ignoring it as soon as we reach
584
// this version we allow some time for the removal to happen. So if the flag
585
// still actually exists we process it as normal, but issue an adjusted warning.
586
const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
587
if (real_flag != nullptr) {588
char version_str[256];
589
version->to_string(version_str, sizeof(version_str));
590
warning("Temporarily processing option %s; support is scheduled for removal in %s",591
flag_name, version_str);
601
int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {602
assert(version != nullptr, "Must provide a version buffer");
604
if (lookup_special_flag(flag_name, flag)) {605
if (!flag.deprecated_in.is_undefined()) {606
if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
607
version_less_than(JDK_Version::current(), flag.expired_in)) {608
*version = flag.deprecated_in;
618
const char* Arguments::real_flag_name(const char *flag_name) {619
for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) {620
const AliasedFlag& flag_status = aliased_jvm_flags[i];
621
if (strcmp(flag_status.alias_name, flag_name) == 0) {622
return flag_status.real_name;
629
static bool lookup_special_flag(const char *flag_name, size_t skip_index) {630
for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {631
if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {638
// Verifies the correctness of the entries in the special_jvm_flags table.
639
// If there is a semantic error (i.e. a bug in the table) such as the obsoletion
640
// version being earlier than the deprecation version, then a warning is issued
641
// and verification fails - by returning false. If it is detected that the table
642
// is out of date, with respect to the current version, then ideally a warning is
643
// issued but verification does not fail. This allows the VM to operate when the
644
// version is first updated, without needing to update all the impacted flags at
645
// the same time. In practice we can't issue the warning immediately when the version
646
// is updated as it occurs for every test and some tests are not prepared to handle
647
// unexpected output - see 8196739. Instead we only check if the table is up-to-date
648
// if the check_globals flag is true, and in addition allow a grace period and only
649
// check for stale flags when we hit build 25 (which is far enough into the 6 month
650
// release cycle that all flag updates should have been processed, whilst still
651
// leaving time to make the change before RDP2).
652
// We use a gtest to call this, passing true, so that we can detect stale flags before
653
// the end of the release cycle.
655
static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
657
bool Arguments::verify_special_jvm_flags(bool check_globals) {659
for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) {660
const SpecialFlag& flag = special_jvm_flags[i];
661
if (lookup_special_flag(flag.name, i)) {662
warning("Duplicate special flag declaration \"%s\"", flag.name);665
if (flag.deprecated_in.is_undefined() &&
666
flag.obsolete_in.is_undefined()) {667
warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);671
if (!flag.deprecated_in.is_undefined()) {672
if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {673
warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);677
if (!version_less_than(flag.deprecated_in, flag.expired_in)) {678
warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);683
if (!flag.obsolete_in.is_undefined()) {684
if (!version_less_than(flag.obsolete_in, flag.expired_in)) {685
warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);689
// if flag has become obsolete it should not have a "globals" flag defined anymore.
690
if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
691
!version_less_than(JDK_Version::current(), flag.obsolete_in)) {692
if (JVMFlag::find_declared_flag(flag.name) != nullptr) {693
warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);698
} else if (!flag.expired_in.is_undefined()) {699
warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);703
if (!flag.expired_in.is_undefined()) {704
// if flag has become expired it should not have a "globals" flag defined anymore.
705
if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
706
!version_less_than(JDK_Version::current(), flag.expired_in)) {707
if (JVMFlag::find_declared_flag(flag.name) != nullptr) {708
warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);718
bool Arguments::atojulong(const char *s, julong* result) {719
return parse_integer(s, result);
722
Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {723
if (size < min_size) return arg_too_small;
724
if (size > max_size) return arg_too_big;
728
// Describe an argument out of range error
729
void Arguments::describe_range_error(ArgsRange errcode) {732
jio_fprintf(defaultStream::error_stream(),
733
"The specified size exceeds the maximum "
734
"representable size.\n");
739
// do nothing for now
742
ShouldNotReachHere();
746
static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {747
if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {754
static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {755
// strtod allows leading whitespace, but our flag format does not.
756
if (*value == '\0' || isspace((unsigned char) *value)) {761
double v = strtod(value, &end);
762
if ((errno != 0) || (*end != 0)) {765
if (g_isnan(v) || !g_isfinite(v)) {766
// Currently we cannot handle these special values.
770
if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {776
static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {777
JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
779
if (flag->is_int()) {781
if (parse_integer(value, &v)) {782
result = JVMFlagAccess::set_int(flag, &v, origin);
784
} else if (flag->is_uint()) {786
if (parse_integer(value, &v)) {787
result = JVMFlagAccess::set_uint(flag, &v, origin);
789
} else if (flag->is_intx()) {791
if (parse_integer(value, &v)) {792
result = JVMFlagAccess::set_intx(flag, &v, origin);
794
} else if (flag->is_uintx()) {796
if (parse_integer(value, &v)) {797
result = JVMFlagAccess::set_uintx(flag, &v, origin);
799
} else if (flag->is_uint64_t()) {801
if (parse_integer(value, &v)) {802
result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
804
} else if (flag->is_size_t()) {806
if (parse_integer(value, &v)) {807
result = JVMFlagAccess::set_size_t(flag, &v, origin);
811
return result == JVMFlag::SUCCESS;
814
static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {815
if (value[0] == '\0') {818
if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
819
// Contract: JVMFlag always returns a pointer that needs freeing.
820
FREE_C_HEAP_ARRAY(char, value);
824
static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {825
const char* old_value = "";
826
if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
827
size_t old_len = old_value != nullptr ? strlen(old_value) : 0;
828
size_t new_len = strlen(new_value);
830
char* free_this_too = nullptr;
833
} else if (new_len == 0) {836
size_t length = old_len + 1 + new_len + 1;
837
char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
838
// each new setting adds another LINE to the switch:
839
jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
843
(void) JVMFlagAccess::set_ccstr(flag, &value, origin);
844
// JVMFlag always returns a pointer that needs freeing.
845
FREE_C_HEAP_ARRAY(char, value);
846
// JVMFlag made its own copy, so I must delete my own temp. buffer.
847
FREE_C_HEAP_ARRAY(char, free_this_too);
851
const char* Arguments::handle_aliases_and_deprecation(const char* arg) {852
const char* real_name = real_flag_name(arg);
853
JDK_Version since = JDK_Version();
854
switch (is_deprecated_flag(arg, &since)) {856
// Obsolete or expired, so don't process normally,
857
// but allow for an obsolete flag we're still
858
// temporarily allowing.
859
if (!is_obsolete_flag(arg, &since)) {862
// Note if we're not considered obsolete then we can't be expired either
863
// as obsoletion must come first.
870
since.to_string(version, sizeof(version));
871
if (real_name != arg) {872
warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",873
arg, version, real_name);
875
warning("Option %s was deprecated in version %s and will likely be removed in a future release.",881
ShouldNotReachHere();
887
JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {888
char name_copied[BUFLEN+1];
889
if (name[name_length] != 0) {890
if (name_length > BUFLEN) {893
strncpy(name_copied, name, name_length);
894
name_copied[name_length] = '\0';
899
const char* real_name = Arguments::handle_aliases_and_deprecation(name);
900
if (real_name == nullptr) {903
JVMFlag* flag = JVMFlag::find_flag(real_name);
907
bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {908
bool is_bool = false;
909
bool bool_val = false;
911
if (c == '+' || c == '-') {913
bool_val = (c == '+');
917
const char* name = arg;
920
if (isalnum(c) || (c == '_')) {927
size_t name_len = size_t(arg - name);
932
JVMFlag* flag = find_jvm_flag(name, name_len);
933
if (flag == nullptr) {939
// Error -- extra characters such as -XX:+BoolFlag=123
942
return set_bool_flag(flag, bool_val, origin);
946
const char* value = arg + 1;
947
if (flag->is_ccstr()) {948
if (flag->ccstr_accumulates()) {949
return append_to_string_flag(flag, value, origin);
951
return set_string_flag(flag, value, origin);
953
} else if (flag->is_double()) {954
return set_fp_numeric_flag(flag, value, origin);
956
return set_numeric_flag(flag, value, origin);
960
if (arg[0] == ':' && arg[1] == '=') {961
// -XX:Foo:=xxx will reset the string flag to the given value.
962
const char* value = arg + 2;
963
return set_string_flag(flag, value, origin);
969
void Arguments::add_string(char*** bldarray, int* count, const char* arg) {970
assert(bldarray != nullptr, "illegal argument");
972
if (arg == nullptr) {976
int new_count = *count + 1;
978
// expand the array and add arg to the last element
979
if (*bldarray == nullptr) {980
*bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
982
*bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
984
(*bldarray)[*count] = os::strdup_check_oom(arg);
988
void Arguments::build_jvm_args(const char* arg) {989
add_string(&_jvm_args_array, &_num_jvm_args, arg);
992
void Arguments::build_jvm_flags(const char* arg) {993
add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
996
// utility function to return a string that concatenates all
997
// strings in a given char** array
998
const char* Arguments::build_resource_string(char** args, int count) {999
if (args == nullptr || count == 0) {1003
for (int i = 0; i < count; i++) {1004
length += strlen(args[i]) + 1; // add 1 for a space or null terminating character
1006
char* s = NEW_RESOURCE_ARRAY(char, length);
1008
for (int j = 0; j < count; j++) {1009
size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character
1010
jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character
1014
return (const char*) s;
1017
void Arguments::print_on(outputStream* st) {1018
st->print_cr("VM Arguments:");1019
if (num_jvm_flags() > 0) {1020
st->print("jvm_flags: "); print_jvm_flags_on(st);1023
if (num_jvm_args() > 0) {1024
st->print("jvm_args: "); print_jvm_args_on(st);1027
st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");1028
if (_java_class_path != nullptr) {1029
char* path = _java_class_path->value();
1030
size_t len = strlen(path);
1031
st->print("java_class_path (initial): ");1032
// Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
1034
st->print_raw_cr("<not set>");1036
st->print_raw_cr(path, len);
1039
st->print_cr("Launcher Type: %s", _sun_java_launcher);1042
void Arguments::print_summary_on(outputStream* st) {1043
// Print the command line. Environment variables that are helpful for
1044
// reproducing the problem are written later in the hs_err file.
1045
// flags are from setting file
1046
if (num_jvm_flags() > 0) {1047
st->print_raw("Settings File: ");1048
print_jvm_flags_on(st);
1051
// args are the command line and environment variable arguments.
1052
st->print_raw("Command Line: ");1053
if (num_jvm_args() > 0) {1054
print_jvm_args_on(st);
1056
// this is the classfile and any arguments to the java program
1057
if (java_command() != nullptr) {1058
st->print("%s", java_command());1063
void Arguments::print_jvm_flags_on(outputStream* st) {1064
if (_num_jvm_flags > 0) {1065
for (int i=0; i < _num_jvm_flags; i++) {1066
st->print("%s ", _jvm_flags_array[i]);1071
void Arguments::print_jvm_args_on(outputStream* st) {1072
if (_num_jvm_args > 0) {1073
for (int i=0; i < _num_jvm_args; i++) {1074
st->print("%s ", _jvm_args_array[i]);1079
bool Arguments::process_argument(const char* arg,
1080
jboolean ignore_unrecognized,
1081
JVMFlagOrigin origin) {1082
JDK_Version since = JDK_Version();
1084
if (parse_argument(arg, origin)) {1088
// Determine if the flag has '+', '-', or '=' characters.
1089
bool has_plus_minus = (*arg == '+' || *arg == '-');
1090
const char* const argname = has_plus_minus ? arg + 1 : arg;
1093
const char* equal_sign = strchr(argname, '=');
1094
if (equal_sign == nullptr) {1095
arg_len = strlen(argname);
1097
arg_len = equal_sign - argname;
1100
// Only make the obsolete check for valid arguments.
1101
if (arg_len <= BUFLEN) {1102
// Construct a string which consists only of the argument name without '+', '-', or '='.
1103
char stripped_argname[BUFLEN+1]; // +1 for '\0'
1104
jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
1105
if (is_obsolete_flag(stripped_argname, &since)) {1107
since.to_string(version, sizeof(version));
1108
warning("Ignoring option %s; support was removed in %s", stripped_argname, version);1113
// For locked flags, report a custom error message if available.
1114
// Otherwise, report the standard unrecognized VM option.
1115
const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
1116
if (found_flag != nullptr) {1117
char locked_message_buf[BUFLEN];
1118
JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
1119
if (strlen(locked_message_buf) != 0) {1121
bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD;
1122
if (ignore_unrecognized && mismatched) {1126
jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1128
if (found_flag->is_bool() && !has_plus_minus) {1129
jio_fprintf(defaultStream::error_stream(),
1130
"Missing +/- setting for VM option '%s'\n", argname);
1131
} else if (!found_flag->is_bool() && has_plus_minus) {1132
jio_fprintf(defaultStream::error_stream(),
1133
"Unexpected +/- setting in VM option '%s'\n", argname);
1135
jio_fprintf(defaultStream::error_stream(),
1136
"Improperly specified VM option '%s'\n", argname);
1139
if (ignore_unrecognized) {1142
jio_fprintf(defaultStream::error_stream(),
1143
"Unrecognized VM option '%s'\n", argname);
1144
JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
1145
if (fuzzy_matched != nullptr) {1146
jio_fprintf(defaultStream::error_stream(),
1147
"Did you mean '%s%s%s'?\n",
1148
(fuzzy_matched->is_bool()) ? "(+/-)" : "",
1149
fuzzy_matched->name(),
1150
(fuzzy_matched->is_bool()) ? "" : "=<value>");
1154
// allow for commandline "commenting out" options like -XX:#+Verbose
1155
return arg[0] == '#';
1158
bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {1159
FILE* stream = os::fopen(file_name, "rb");
1160
if (stream == nullptr) {1162
jio_fprintf(defaultStream::error_stream(),
1163
"Could not open settings file %s\n", file_name);
1173
bool in_white_space = true;
1174
bool in_comment = false;
1175
bool in_quote = false;
1179
int c = getc(stream);
1180
while(c != EOF && pos < (int)(sizeof(token)-1)) {1181
if (in_white_space) {1183
if (c == '\n') in_comment = false;
1185
if (c == '#') in_comment = true;
1186
else if (!isspace((unsigned char) c)) {1187
in_white_space = false;
1188
token[pos++] = checked_cast<char>(c);
1192
if (c == '\n' || (!in_quote && isspace((unsigned char) c))) {1193
// token ends at newline, or at unquoted whitespace
1194
// this allows a way to include spaces in string-valued options
1197
result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1198
build_jvm_flags(token);
1200
in_white_space = true;
1202
} else if (!in_quote && (c == '\'' || c == '"')) {1205
} else if (in_quote && (c == quote_c)) {1208
token[pos++] = checked_cast<char>(c);
1215
result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
1216
build_jvm_flags(token);
1222
//=============================================================================================================
1223
// Parsing of properties (-D)
1225
const char* Arguments::get_property(const char* key) {1226
return PropertyList_get_value(system_properties(), key);
1229
bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {1230
const char* eq = strchr(prop, '=');
1232
const char* value = "";
1234
if (eq == nullptr) {1235
// property doesn't have a value, thus use passed string
1238
// property have a value, thus extract it and save to the
1240
size_t key_len = eq - prop;
1241
char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
1243
jio_snprintf(tmp_key, key_len + 1, "%s", prop);
1246
value = &prop[key_len + 1];
1249
if (internal == ExternalProperty) {1250
CDSConfig::check_incompatible_property(key, value);
1253
if (strcmp(key, "java.compiler") == 0) {1254
// we no longer support java.compiler system property, log a warning and let it get
1255
// passed to Java, like any other system property
1256
if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) {1257
// for applications using NONE or empty value, log a more informative message
1258
warning("The java.compiler system property is obsolete and no longer supported, use -Xint");1260
warning("The java.compiler system property is obsolete and no longer supported.");1262
} else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {1263
// sun.java.launcher.is_altjvm property is
1264
// private and is processed in process_sun_java_launcher_properties();
1265
// the sun.java.launcher property is passed on to the java application
1266
} else if (strcmp(key, "sun.boot.library.path") == 0) {1267
// append is true, writable is true, internal is false
1268
PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
1269
WriteableProperty, ExternalProperty);
1271
if (strcmp(key, "sun.java.command") == 0) {1272
char *old_java_command = _java_command;
1273
_java_command = os::strdup_check_oom(value, mtArguments);
1274
if (old_java_command != nullptr) {1275
os::free(old_java_command);
1277
} else if (strcmp(key, "java.vendor.url.bug") == 0) {1278
// If this property is set on the command line then its value will be
1279
// displayed in VM error logs as the URL at which to submit such logs.
1280
// Normally the URL displayed in error logs is different from the value
1281
// of this system property, so a different property should have been
1282
// used here, but we leave this as-is in case someone depends upon it.
1283
const char* old_java_vendor_url_bug = _java_vendor_url_bug;
1284
// save it in _java_vendor_url_bug, so JVM fatal error handler can access
1285
// its value without going through the property list or making a Java call.
1286
_java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
1287
if (old_java_vendor_url_bug != nullptr) {1288
os::free((void *)old_java_vendor_url_bug);
1292
// Create new property and add at the end of the list
1293
PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
1297
// SystemProperty copy passed value, thus free previously allocated
1299
FreeHeap((void *)key);
1305
//===========================================================================================================
1306
// Setting int/mixed/comp mode flags
1308
void Arguments::set_mode_flags(Mode mode) {1309
// Set up default values for all flags.
1310
// If you add a flag to any of the branches below,
1311
// add a default value for it here.
1314
// Ensure Agent_OnLoad has the correct initial values.
1315
// This may not be the final mode; mode may change later in onload phase.
1316
PropertyList_unique_add(&_system_properties, "java.vm.info",
1317
VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
1319
UseInterpreter = true;
1321
UseLoopCounter = true;
1323
// Default values may be platform/compiler dependent -
1324
// use the saved values
1325
ClipInlining = Arguments::_ClipInlining;
1326
AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1327
UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1328
BackgroundCompilation = Arguments::_BackgroundCompilation;
1330
// Change from defaults based on mode
1333
ShouldNotReachHere();
1336
UseCompiler = false;
1337
UseLoopCounter = false;
1338
AlwaysCompileLoopMethods = false;
1339
UseOnStackReplacement = false;
1345
UseInterpreter = false;
1346
BackgroundCompilation = false;
1347
ClipInlining = false;
1352
// Conflict: required to use shared spaces (-Xshare:on), but
1353
// incompatible command line options were chosen.
1354
void Arguments::no_shared_spaces(const char* message) {1355
if (RequireSharedSpaces) {1356
jio_fprintf(defaultStream::error_stream(),
1357
"Class data sharing is inconsistent with other specified options.\n");
1358
vm_exit_during_initialization("Unable to use shared archive", message);1360
log_info(cds)("Unable to use shared archive: %s", message);1361
UseSharedSpaces = false;
1365
static void set_object_alignment() {1366
// Object alignment.
1367
assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1368
MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1369
assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1370
MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1371
assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1372
MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1374
LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1375
LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1377
// Oop encoding heap max
1378
OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1381
size_t Arguments::max_heap_for_compressed_oops() {1383
assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1384
// We need to fit both the null page and the heap into the memory budget, while
1385
// keeping alignment constraints of the heap. To guarantee the latter, as the
1386
// null page is located before the heap, we pad the null page to the conservative
1387
// maximum alignment that the GC may ever impose upon the heap.
1388
size_t displacement_due_to_null_page = align_up(os::vm_page_size(),
1389
_conservative_max_heap_alignment);
1391
LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1392
NOT_LP64(ShouldNotReachHere(); return 0);
1395
void Arguments::set_use_compressed_oops() {1397
// MaxHeapSize is not set up properly at this point, but
1398
// the only value that can override MaxHeapSize if we are
1399
// to use UseCompressedOops are InitialHeapSize and MinHeapSize.
1400
size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
1402
if (max_heap_size <= max_heap_for_compressed_oops()) {1403
if (FLAG_IS_DEFAULT(UseCompressedOops)) {1404
FLAG_SET_ERGO(UseCompressedOops, true);
1407
if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {1408
warning("Max heap size too large for Compressed Oops");1409
FLAG_SET_DEFAULT(UseCompressedOops, false);
1415
void Arguments::set_use_compressed_klass_ptrs() {1417
assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax,
1418
"CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1422
void Arguments::set_conservative_max_heap_alignment() {1423
// The conservative maximum required alignment for the heap is the maximum of
1424
// the alignments imposed by several sources: any requirements from the heap
1425
// itself and the maximum page size we may run the VM with.
1426
size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
1427
_conservative_max_heap_alignment = MAX4(heap_alignment,
1428
os::vm_allocation_granularity(),
1429
os::max_page_size(),
1430
GCArguments::compute_heap_alignment());
1433
jint Arguments::set_ergonomics_flags() {1434
GCConfig::initialize();
1436
set_conservative_max_heap_alignment();
1439
set_use_compressed_oops();
1440
set_use_compressed_klass_ptrs();
1442
// Also checks that certain machines are slower with compressed oops
1443
// in vm_version initialization code.
1449
size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {1450
size_t max_allocatable;
1451
size_t result = limit;
1452
if (os::has_allocatable_memory_limit(&max_allocatable)) {1453
// The AggressiveHeap check is a temporary workaround to avoid calling
1454
// GCarguments::heap_virtual_to_physical_ratio() before a GC has been
1455
// selected. This works because AggressiveHeap implies UseParallelGC
1456
// where we know the ratio will be 1. Once the AggressiveHeap option is
1457
// removed, this can be cleaned up.
1458
size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
1459
size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
1460
result = MIN2(result, max_allocatable / fraction);
1465
// Use static initialization to get the default before parsing
1466
static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1468
void Arguments::set_heap_size() {1471
// If the user specified one of these options, they
1472
// want specific memory sizing so do not limit memory
1473
// based on compressed oops addressability.
1474
// Also, memory limits will be calculated based on
1475
// available os physical memory, not our MaxRAM limit,
1476
// unless MaxRAM is also specified.
1477
bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
1478
!FLAG_IS_DEFAULT(MinRAMPercentage) ||
1479
!FLAG_IS_DEFAULT(InitialRAMPercentage) ||
1480
!FLAG_IS_DEFAULT(MaxRAM));
1481
if (override_coop_limit) {1482
if (FLAG_IS_DEFAULT(MaxRAM)) {1483
phys_mem = os::physical_memory();
1484
FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
1486
phys_mem = (julong)MaxRAM;
1489
phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1493
// If the maximum heap size has not been set with -Xmx,
1494
// then set it as fraction of the size of physical memory,
1495
// respecting the maximum and minimum sizes of the heap.
1496
if (FLAG_IS_DEFAULT(MaxHeapSize)) {1497
julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100);
1498
const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100);
1499
if (reasonable_min < MaxHeapSize) {1500
// Small physical memory, so use a minimum fraction of it for the heap
1501
reasonable_max = reasonable_min;
1503
// Not-small physical memory, so require a heap at least
1504
// as large as MaxHeapSize
1505
reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1508
if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {1509
// Limit the heap size to ErgoHeapSizeLimit
1510
reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1513
reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
1515
if (!FLAG_IS_DEFAULT(InitialHeapSize)) {1516
// An initial heap size was specified on the command line,
1517
// so be sure that the maximum size is consistent. Done
1518
// after call to limit_heap_by_allocatable_memory because that
1519
// method might reduce the allocation size.
1520
reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1521
} else if (!FLAG_IS_DEFAULT(MinHeapSize)) {1522
reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
1526
if (UseCompressedOops || UseCompressedClassPointers) {1527
// HeapBaseMinAddress can be greater than default but not less than.
1528
if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {1529
if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {1530
// matches compressed oops printing flags
1531
log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT1532
" (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,1533
DefaultHeapBaseMinAddress,
1534
DefaultHeapBaseMinAddress/G,
1535
HeapBaseMinAddress);
1536
FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1540
if (UseCompressedOops) {1541
// Limit the heap size to the maximum possible when using compressed oops
1542
julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1544
if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {1545
// Heap should be above HeapBaseMinAddress to get zero based compressed oops
1546
// but it should be not less than default MaxHeapSize.
1547
max_coop_heap -= HeapBaseMinAddress;
1550
// If user specified flags prioritizing os physical
1551
// memory limits, then disable compressed oops if
1552
// limits exceed max_coop_heap and UseCompressedOops
1553
// was not specified.
1554
if (reasonable_max > max_coop_heap) {1555
if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) {1556
log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to"1557
" max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". "
1558
"Please check the setting of MaxRAMPercentage %5.2f."
1559
,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage);
1560
FLAG_SET_ERGO(UseCompressedOops, false);
1562
reasonable_max = MIN2(reasonable_max, max_coop_heap);
1568
log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);1569
FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max);
1572
// If the minimum or initial heap_size have not been set or requested to be set
1573
// ergonomically, set them accordingly.
1574
if (InitialHeapSize == 0 || MinHeapSize == 0) {1575
julong reasonable_minimum = (julong)(OldSize + NewSize);
1577
reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1579
reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum);
1581
if (InitialHeapSize == 0) {1582
julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100);
1583
reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial);
1585
reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize);
1586
reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1588
FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial);
1589
log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize);1591
// If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize),
1592
// synchronize with InitialHeapSize to avoid errors with the default value.
1593
if (MinHeapSize == 0) {1594
FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize));
1595
log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize);1600
// This option inspects the machine and attempts to set various
1601
// parameters to be optimal for long-running, memory allocation
1602
// intensive jobs. It is intended for machines with large
1603
// amounts of cpu and memory.
1604
jint Arguments::set_aggressive_heap_flags() {1605
// initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1606
// VM, but we may not be able to represent the total physical memory
1607
// available (like having 8gb of memory on a box but using a 32bit VM).
1608
// Thus, we need to make sure we're using a julong for intermediate
1610
julong initHeapSize;
1611
julong total_memory = os::physical_memory();
1613
if (total_memory < (julong) 256 * M) {1614
jio_fprintf(defaultStream::error_stream(),
1615
"You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1619
// The heap size is half of available memory, or (at most)
1620
// all of possible memory less 160mb (leaving room for the OS
1621
// when using ISM). This is the maximum; because adaptive sizing
1622
// is turned on below, the actual space used may be smaller.
1624
initHeapSize = MIN2(total_memory / (julong) 2,
1625
total_memory - (julong) 160 * M);
1627
initHeapSize = limit_heap_by_allocatable_memory(initHeapSize);
1629
if (FLAG_IS_DEFAULT(MaxHeapSize)) {1630
if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) {1633
if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) {1636
if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) {1640
if (FLAG_IS_DEFAULT(NewSize)) {1641
// Make the young generation 3/8ths of the total heap.
1642
if (FLAG_SET_CMDLINE(NewSize,
1643
((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) {1646
if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) {1651
#if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
1652
FLAG_SET_DEFAULT(UseLargePages, true);
1655
// Increase some data structure sizes for efficiency
1656
if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) {1659
if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) {1662
if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) {1666
// See the OldPLABSize comment below, but replace 'after promotion'
1667
// with 'after copying'. YoungPLABSize is the size of the survivor
1668
// space per-gc-thread buffers. The default is 4kw.
1669
if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words1673
// OldPLABSize is the size of the buffers in the old gen that
1674
// UseParallelGC uses to promote live data that doesn't fit in the
1675
// survivor spaces. At any given time, there's one for each gc thread.
1676
// The default size is 1kw. These buffers are rarely used, since the
1677
// survivor spaces are usually big enough. For specjbb, however, there
1678
// are occasions when there's lots of live data in the young gen
1679
// and we end up promoting some of it. We don't have a definite
1680
// explanation for why bumping OldPLABSize helps, but the theory
1681
// is that a bigger PLAB results in retaining something like the
1682
// original allocation order after promotion, which improves mutator
1683
// locality. A minor effect may be that larger PLABs reduce the
1684
// number of PLAB allocation events during gc. The value of 8kw
1685
// was arrived at by experimenting with specjbb.
1686
if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words1690
// Enable parallel GC and adaptive generation sizing
1691
if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) {1695
// Encourage steady state memory management
1696
if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) {1703
// This must be called after ergonomics.
1704
void Arguments::set_bytecode_flags() {1705
if (!RewriteBytecodes) {1706
FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1710
// Aggressive optimization flags
1711
jint Arguments::set_aggressive_opts_flags() {1713
if (AggressiveUnboxing) {1714
if (FLAG_IS_DEFAULT(EliminateAutoBox)) {1715
FLAG_SET_DEFAULT(EliminateAutoBox, true);
1716
} else if (!EliminateAutoBox) {1717
// warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");1718
AggressiveUnboxing = false;
1720
if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {1721
FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1722
} else if (!DoEscapeAnalysis) {1723
// warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");1724
AggressiveUnboxing = false;
1727
if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) {1728
if (FLAG_IS_DEFAULT(EliminateAutoBox)) {1729
FLAG_SET_DEFAULT(EliminateAutoBox, true);
1731
// Feed the cache size setting into the JDK
1733
jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1734
if (!add_property(buffer)) {1743
//===========================================================================================================
1745
void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {1746
if (_sun_java_launcher != _default_java_launcher) {1747
os::free(const_cast<char*>(_sun_java_launcher));
1749
_sun_java_launcher = os::strdup_check_oom(launcher);
1752
bool Arguments::created_by_java_launcher() {1753
assert(_sun_java_launcher != nullptr, "property must have value");
1754
return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1757
bool Arguments::sun_java_launcher_is_altjvm() {1758
return _sun_java_launcher_is_altjvm;
1761
//===========================================================================================================
1762
// Parsing of main arguments
1764
unsigned int addreads_count = 0;
1765
unsigned int addexports_count = 0;
1766
unsigned int addopens_count = 0;
1767
unsigned int addmods_count = 0;
1768
unsigned int patch_mod_count = 0;
1769
unsigned int enable_native_access_count = 0;
1771
// Check the consistency of vm_init_args
1772
bool Arguments::check_vm_args_consistency() {1773
// Method for adding checks for flag consistency.
1774
// The intent is to warn the user of all possible conflicts,
1775
// before returning an error.
1776
// Note: Needs platform-dependent factoring.
1779
if (TLABRefillWasteFraction == 0) {1780
jio_fprintf(defaultStream::error_stream(),
1781
"TLABRefillWasteFraction should be a denominator, "
1782
"not " SIZE_FORMAT "\n",
1783
TLABRefillWasteFraction);
1787
status = CompilerConfig::check_args_consistency(status);
1789
if (status && EnableJVMCI) {1790
PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true",
1791
AddProperty, UnwriteableProperty, InternalProperty);
1792
if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) {1793
if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) {1801
if (status && (FlightRecorderOptions || StartFlightRecording)) {1802
if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) {1808
#ifndef SUPPORT_RESERVED_STACK_AREA
1809
if (StackReservedPages != 0) {1810
FLAG_SET_CMDLINE(StackReservedPages, 0);
1811
warning("Reserved Stack Area not supported on this platform");1815
#if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390)
1816
if (LockingMode == LM_LIGHTWEIGHT) {1817
FLAG_SET_CMDLINE(LockingMode, LM_LEGACY);
1818
warning("New lightweight locking not supported on this platform");1822
#if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390)
1823
if (LockingMode == LM_MONITOR) {1824
jio_fprintf(defaultStream::error_stream(),
1825
"LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n");
1829
if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) {1830
jio_fprintf(defaultStream::error_stream(),
1831
"-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n");
1837
bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1838
const char* option_type) {1839
if (ignore) return false;
1841
const char* spacer = " ";
1842
if (option_type == nullptr) {1843
option_type = ++spacer; // Set both to the empty string.
1846
jio_fprintf(defaultStream::error_stream(),
1847
"Unrecognized %s%soption: %s\n", option_type, spacer,
1848
option->optionString);
1852
static const char* user_assertion_options[] = {1853
"-da", "-ea", "-disableassertions", "-enableassertions", nullptr
1856
static const char* system_assertion_options[] = {1857
"-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr
1860
bool Arguments::parse_uint(const char* value,
1864
if (!parse_integer(value, &n)) {1867
if (n >= min_size) {1875
bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) {1876
assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name);
1877
CDSConfig::check_internal_module_property(prop_name, prop_value);
1878
size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2;
1879
char* property = AllocateHeap(prop_len, mtArguments);
1880
int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value);
1881
if (ret < 0 || ret >= (int)prop_len) {1885
// These are not strictly writeable properties as they cannot be set via -Dprop=val. But that
1886
// is enforced by checking is_internal_module_property(). We need the property to be writeable so
1887
// that multiple occurrences of the associated flag just causes the existing property value to be
1888
// replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert1889
// to a property after we have finished flag processing.
1890
bool added = add_property(property, WriteableProperty, internal);
1895
bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) {1896
assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name);
1897
CDSConfig::check_internal_module_property(prop_base_name, prop_value);
1898
const unsigned int props_count_limit = 1000;
1899
const int max_digits = 3;
1900
const int extra_symbols_count = 3; // includes '.', '=', '\0'
1902
// Make sure count is < props_count_limit. Otherwise, memory allocation will be too small.
1903
if (count < props_count_limit) {1904
size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count;
1905
char* property = AllocateHeap(prop_len, mtArguments);
1906
int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value);
1907
if (ret < 0 || ret >= (int)prop_len) {1909
jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value);
1912
bool added = add_property(property, UnwriteableProperty, InternalProperty);
1917
jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit);
1921
Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1925
if (!parse_integer(s, long_arg)) return arg_unreadable;
1926
return check_memory_size(*long_arg, min_size, max_size);
1929
// Parse JavaVMInitArgs structure
1931
jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args,
1932
const JavaVMInitArgs *java_tool_options_args,
1933
const JavaVMInitArgs *java_options_args,
1934
const JavaVMInitArgs *cmd_line_args) {1935
bool patch_mod_javabase = false;
1937
// Save default settings for some mode flags
1938
Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1939
Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1940
Arguments::_ClipInlining = ClipInlining;
1941
Arguments::_BackgroundCompilation = BackgroundCompilation;
1943
// Remember the default value of SharedBaseAddress.
1944
Arguments::_default_SharedBaseAddress = SharedBaseAddress;
1946
// Setup flags for mixed which is the default
1947
set_mode_flags(_mixed);
1949
// Parse args structure generated from java.base vm options resource
1950
jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE);
1951
if (result != JNI_OK) {1955
// Parse args structure generated from JAVA_TOOL_OPTIONS environment
1956
// variable (if present).
1957
result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1958
if (result != JNI_OK) {1962
// Parse args structure generated from the command line flags.
1963
result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE);
1964
if (result != JNI_OK) {1968
// Parse args structure generated from the _JAVA_OPTIONS environment
1969
// variable (if present) (mimics classic VM)
1970
result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR);
1971
if (result != JNI_OK) {1975
// Disable CDS for exploded image
1976
if (!has_jimage()) {1977
no_shared_spaces("CDS disabled on exploded JDK");1980
// We need to ensure processor and memory resources have been properly
1981
// configured - which may rely on arguments we just processed - before
1982
// doing the final argument processing. Any argument processing that
1983
// needs to know about processor and memory resources must occur after
1986
os::init_container_support();
1988
SystemMemoryBarrier::initialize();
1990
// Do final processing now that all arguments have been parsed
1991
result = finalize_vm_init_args(patch_mod_javabase);
1992
if (result != JNI_OK) {2000
// Checks if name in command-line argument -agent{lib,path}:name[=options]2001
// represents a valid JDWP agent. is_path==true denotes that we
2002
// are dealing with -agentpath (case where name is a path), otherwise with
2004
static bool valid_jdwp_agent(char *name, bool is_path) {2006
const char *_jdwp = "jdwp";
2007
size_t _len_jdwp, _len_prefix;
2010
if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) {2014
_name++; // skip past last path separator
2015
_len_prefix = strlen(JNI_LIB_PREFIX);
2017
if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {2021
_name += _len_prefix;
2022
_len_jdwp = strlen(_jdwp);
2024
if (strncmp(_name, _jdwp, _len_jdwp) == 0) {2031
if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {2038
if (strcmp(name, _jdwp) == 0) {2046
int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) {2047
// --patch-module=<module>=<file>(<pathsep><file>)*
2048
assert(patch_mod_tail != nullptr, "Unexpected null patch-module value");
2049
// Find the equal sign between the module name and the path specification
2050
const char* module_equal = strchr(patch_mod_tail, '=');
2051
if (module_equal == nullptr) {2052
jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n");
2055
// Pick out the module name
2056
size_t module_len = module_equal - patch_mod_tail;
2057
char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments);
2058
if (module_name != nullptr) {2059
memcpy(module_name, patch_mod_tail, module_len);
2060
*(module_name + module_len) = '\0';
2061
// The path piece begins one past the module_equal sign
2062
add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase);
2063
FREE_C_HEAP_ARRAY(char, module_name);
2064
if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) {2074
// Parse -Xss memory string parameter and convert to ThreadStackSize in K.
2075
jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) {2076
// The min and max sizes match the values in globals.hpp, but scaled
2077
// with K. The values have been chosen so that alignment with page
2078
// size doesn't change the max value, which makes the conversions
2079
// back and forth between Xss value and ThreadStackSize value easier.
2080
// The values have also been chosen to fit inside a 32-bit signed type.
2081
const julong min_ThreadStackSize = 0;
2082
const julong max_ThreadStackSize = 1 * M;
2084
// Make sure the above values match the range set in globals.hpp
2085
const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>();
2086
assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be");
2087
assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be");
2089
const julong min_size = min_ThreadStackSize * K;
2090
const julong max_size = max_ThreadStackSize * K;
2092
assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption");
2095
ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size);
2096
if (errcode != arg_in_range) {2097
bool silent = (option == nullptr); // Allow testing to silence error messages
2099
jio_fprintf(defaultStream::error_stream(),
2100
"Invalid thread stack size: %s\n", option->optionString);
2101
describe_range_error(errcode);
2106
// Internally track ThreadStackSize in units of 1024 bytes.
2107
const julong size_aligned = align_up(size, K);
2108
assert(size <= size_aligned,
2109
"Overflow: " JULONG_FORMAT " " JULONG_FORMAT,
2110
size, size_aligned);
2112
const julong size_in_K = size_aligned / K;
2113
assert(size_in_K < (julong)max_intx,
2114
"size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT,
2117
// Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow.
2118
const julong max_expanded = align_up(size_in_K * K, os::vm_page_size());
2119
assert(max_expanded < max_uintx && max_expanded >= size_in_K,
2120
"Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT,
2121
max_expanded, size_in_K);
2123
*out_ThreadStackSize = (intx)size_in_K;
2128
jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) {2129
// For match_option to return remaining or value part of option string
2132
// iterate over arguments
2133
for (int index = 0; index < args->nOptions; index++) {2134
bool is_absolute_path = false; // for -agentpath vs -agentlib
2136
const JavaVMOption* option = args->options + index;
2138
if (!match_option(option, "-Djava.class.path", &tail) &&
2139
!match_option(option, "-Dsun.java.command", &tail) &&
2140
!match_option(option, "-Dsun.java.launcher", &tail)) {2142
// add all jvm options to the jvm_args string. This string
2143
// is used later to set the java.vm.args PerfData string constant.
2144
// the -Djava.class.path and the -Dsun.java.command options are
2145
// omitted from jvm_args string as each have their own PerfData
2146
// string constant object.
2147
build_jvm_args(option->optionString);
2150
// -verbose:[class/module/gc/jni]
2151
if (match_option(option, "-verbose", &tail)) {2152
if (!strcmp(tail, ":class") || !strcmp(tail, "")) {2153
LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load));
2154
LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload));
2155
} else if (!strcmp(tail, ":module")) {2156
LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load));
2157
LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload));
2158
} else if (!strcmp(tail, ":gc")) {2159
if (_legacyGCLogging.lastFlag == 0) {2160
_legacyGCLogging.lastFlag = 1;
2162
} else if (!strcmp(tail, ":jni")) {2163
LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve));
2165
// -da / -ea / -disableassertions / -enableassertions
2166
// These accept an optional class/package name separated by a colon, e.g.,
2167
// -da:java.lang.Thread.
2168
} else if (match_option(option, user_assertion_options, &tail, true)) {2169
bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2170
if (*tail == '\0') {2171
JavaAssertions::setUserClassDefault(enable);
2173
assert(*tail == ':', "bogus match by match_option()");
2174
JavaAssertions::addOption(tail + 1, enable);
2176
// -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2177
} else if (match_option(option, system_assertion_options, &tail, false)) {2178
bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2179
JavaAssertions::setSystemClassDefault(enable);
2181
} else if (match_option(option, "-Xbootclasspath:", &tail)) {2182
jio_fprintf(defaultStream::output_stream(),
2183
"-Xbootclasspath is no longer a supported option.\n");
2185
// -bootclasspath/a:
2186
} else if (match_option(option, "-Xbootclasspath/a:", &tail)) {2187
Arguments::append_sysclasspath(tail);
2188
// -bootclasspath/p:
2189
} else if (match_option(option, "-Xbootclasspath/p:", &tail)) {2190
jio_fprintf(defaultStream::output_stream(),
2191
"-Xbootclasspath/p is no longer a supported option.\n");
2194
} else if (match_option(option, "-Xrun", &tail)) {2195
if (tail != nullptr) {2196
const char* pos = strchr(tail, ':');
2197
size_t len = (pos == nullptr) ? strlen(tail) : pos - tail;
2198
char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2199
jio_snprintf(name, len + 1, "%s", tail);
2201
char *options = nullptr;
2202
if(pos != nullptr) {2203
size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2204
options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2);
2207
if (strcmp(name, "jdwp") == 0) {2208
jio_fprintf(defaultStream::error_stream(),
2209
"Debugging agents are not supported in this VM\n");
2212
#endif // !INCLUDE_JVMTI
2213
JvmtiAgentList::add_xrun(name, options, false);
2214
FREE_C_HEAP_ARRAY(char, name);
2215
FREE_C_HEAP_ARRAY(char, options);
2217
} else if (match_option(option, "--add-reads=", &tail)) {2218
if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) {2221
} else if (match_option(option, "--add-exports=", &tail)) {2222
if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) {2225
} else if (match_option(option, "--add-opens=", &tail)) {2226
if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) {2229
} else if (match_option(option, "--add-modules=", &tail)) {2230
if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) {2233
} else if (match_option(option, "--enable-native-access=", &tail)) {2234
if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) {2237
} else if (match_option(option, "--limit-modules=", &tail)) {2238
if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) {2241
} else if (match_option(option, "--module-path=", &tail)) {2242
if (!create_module_property("jdk.module.path", tail, ExternalProperty)) {2245
} else if (match_option(option, "--upgrade-module-path=", &tail)) {2246
if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) {2249
} else if (match_option(option, "--patch-module=", &tail)) {2250
// --patch-module=<module>=<file>(<pathsep><file>)*
2251
int res = process_patch_mod_option(tail, patch_mod_javabase);
2252
if (res != JNI_OK) {2255
} else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) {2256
if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) {2257
PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail,
2258
AddProperty, WriteableProperty, InternalProperty);
2260
jio_fprintf(defaultStream::error_stream(),
2261
"Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail);
2264
} else if (match_option(option, "--illegal-access=", &tail)) {2266
JDK_Version::jdk(17).to_string(version, sizeof(version));
2267
warning("Ignoring option %s; support was removed in %s", option->optionString, version);2268
// -agentlib and -agentpath
2269
} else if (match_option(option, "-agentlib:", &tail) ||
2270
(is_absolute_path = match_option(option, "-agentpath:", &tail))) {2271
if(tail != nullptr) {2272
const char* pos = strchr(tail, '=');
2274
if (pos == nullptr) {2275
name = os::strdup_check_oom(tail, mtArguments);
2277
size_t len = pos - tail;
2278
name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments);
2279
memcpy(name, tail, len);
2283
char *options = nullptr;
2284
if(pos != nullptr) {2285
options = os::strdup_check_oom(pos + 1, mtArguments);
2288
if (valid_jdwp_agent(name, is_absolute_path)) {2289
jio_fprintf(defaultStream::error_stream(),
2290
"Debugging agents are not supported in this VM\n");
2293
#endif // !INCLUDE_JVMTI
2294
JvmtiAgentList::add(name, options, is_absolute_path);
2299
} else if (match_option(option, "-javaagent:", &tail)) {2301
jio_fprintf(defaultStream::error_stream(),
2302
"Instrumentation agents are not supported in this VM\n");
2305
if (tail != nullptr) {2306
size_t length = strlen(tail) + 1;
2307
char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments);
2308
jio_snprintf(options, length, "%s", tail);
2309
JvmtiAgentList::add("instrument", options, false);2310
FREE_C_HEAP_ARRAY(char, options);
2312
// java agents need module java.instrument
2313
if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) {2317
#endif // !INCLUDE_JVMTI
2319
} else if (match_option(option, "--enable-preview")) {2320
set_enable_preview();
2322
} else if (match_option(option, "-Xnoclassgc")) {2323
if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) {2327
} else if (match_option(option, "-Xbatch")) {2328
if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) {2331
// -Xmn for compatibility with other JVM vendors
2332
} else if (match_option(option, "-Xmn", &tail)) {2333
julong long_initial_young_size = 0;
2334
ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2335
if (errcode != arg_in_range) {2336
jio_fprintf(defaultStream::error_stream(),
2337
"Invalid initial young generation size: %s\n", option->optionString);
2338
describe_range_error(errcode);
2341
if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {2344
if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) {2348
} else if (match_option(option, "-Xms", &tail)) {2350
// an initial heap size of 0 means automatically determine
2351
ArgsRange errcode = parse_memory_size(tail, &size, 0);
2352
if (errcode != arg_in_range) {2353
jio_fprintf(defaultStream::error_stream(),
2354
"Invalid initial heap size: %s\n", option->optionString);
2355
describe_range_error(errcode);
2358
if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) {2361
if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) {2365
} else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {2366
julong long_max_heap_size = 0;
2367
ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2368
if (errcode != arg_in_range) {2369
jio_fprintf(defaultStream::error_stream(),
2370
"Invalid maximum heap size: %s\n", option->optionString);
2371
describe_range_error(errcode);
2374
if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) {2378
} else if (match_option(option, "-Xmaxf", &tail)) {2380
int maxf = (int)(strtod(tail, &err) * 100);
2381
if (*err != '\0' || *tail == '\0') {2382
jio_fprintf(defaultStream::error_stream(),
2383
"Bad max heap free percentage size: %s\n",
2384
option->optionString);
2387
if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) {2392
} else if (match_option(option, "-Xminf", &tail)) {2394
int minf = (int)(strtod(tail, &err) * 100);
2395
if (*err != '\0' || *tail == '\0') {2396
jio_fprintf(defaultStream::error_stream(),
2397
"Bad min heap free percentage size: %s\n",
2398
option->optionString);
2401
if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) {2406
} else if (match_option(option, "-Xss", &tail)) {2408
jint err = parse_xss(option, tail, &value);
2409
if (err != JNI_OK) {2412
if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) {2415
} else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2416
match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {2417
julong long_ReservedCodeCacheSize = 0;
2419
ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2420
if (errcode != arg_in_range) {2421
jio_fprintf(defaultStream::error_stream(),
2422
"Invalid maximum code cache size: %s.\n", option->optionString);
2425
if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) {2429
} else if (match_option(option, "-green")) {2430
jio_fprintf(defaultStream::error_stream(),
2431
"Green threads support not available\n");
2434
} else if (match_option(option, "-native")) {2435
// HotSpot always uses native threads, ignore silently for compatibility
2437
} else if (match_option(option, "-Xrs")) {2438
// Classic/EVM option, new functionality
2439
if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) {2443
} else if (match_option(option, "-Xprof")) {2445
// Obsolete in JDK 10
2446
JDK_Version::jdk(10).to_string(version, sizeof(version));
2447
warning("Ignoring option %s; support was removed in %s", option->optionString, version);2448
// -Xinternalversion
2449
} else if (match_option(option, "-Xinternalversion")) {2450
jio_fprintf(defaultStream::output_stream(), "%s\n",
2451
VM_Version::internal_vm_info_string());
2455
} else if (match_option(option, "-Xprintflags")) {2456
JVMFlag::printFlags(tty, false);
2460
} else if (match_option(option, "-D", &tail)) {2462
if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2463
*value!= '\0' && strcmp(value, "\"\"") != 0) {2464
// abort if -Djava.endorsed.dirs is set
2465
jio_fprintf(defaultStream::output_stream(),
2466
"-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2467
"in modular form will be supported via the concept of upgradeable modules.\n", value);
2470
if (match_option(option, "-Djava.ext.dirs=", &value) &&
2471
*value != '\0' && strcmp(value, "\"\"") != 0) {2472
// abort if -Djava.ext.dirs is set
2473
jio_fprintf(defaultStream::output_stream(),
2474
"-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2477
// Check for module related properties. They must be set using the modules
2478
// options. For example: use "--add-modules=java.sql", not
2479
// "-Djdk.module.addmods=java.sql"
2480
if (is_internal_module_property(option->optionString + 2)) {2481
needs_module_property_warning = true;
2484
if (!add_property(tail)) {2487
// Out of the box management support
2488
if (match_option(option, "-Dcom.sun.management", &tail)) {2489
#if INCLUDE_MANAGEMENT
2490
if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) {2493
// management agent in module jdk.management.agent
2494
if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) {2498
jio_fprintf(defaultStream::output_stream(),
2499
"-Dcom.sun.management is not supported in this VM.\n");
2504
} else if (match_option(option, "-Xint")) {2505
set_mode_flags(_int);
2506
mode_flag_cmd_line = true;
2508
} else if (match_option(option, "-Xmixed")) {2509
set_mode_flags(_mixed);
2510
mode_flag_cmd_line = true;
2512
} else if (match_option(option, "-Xcomp")) {2513
// for testing the compiler; turn off all flags that inhibit compilation
2514
set_mode_flags(_comp);
2515
mode_flag_cmd_line = true;
2517
} else if (match_option(option, "-Xshare:dump")) {2518
CDSConfig::enable_dumping_static_archive();
2520
} else if (match_option(option, "-Xshare:on")) {2521
UseSharedSpaces = true;
2522
RequireSharedSpaces = true;
2523
// -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file>
2524
} else if (match_option(option, "-Xshare:auto")) {2525
UseSharedSpaces = true;
2526
RequireSharedSpaces = false;
2527
xshare_auto_cmd_line = true;
2529
} else if (match_option(option, "-Xshare:off")) {2530
UseSharedSpaces = false;
2531
RequireSharedSpaces = false;
2533
} else if (match_option(option, "-Xverify", &tail)) {2534
if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {2535
if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) {2538
if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {2541
} else if (strcmp(tail, ":remote") == 0) {2542
if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {2545
if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) {2548
} else if (strcmp(tail, ":none") == 0) {2549
if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) {2552
if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) {2555
warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.");2556
} else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {2560
} else if (match_option(option, "-Xdebug")) {2561
warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release.");2562
} else if (match_option(option, "-Xloggc:", &tail)) {2563
// Deprecated flag to redirect GC output to a file. -Xloggc:<filename>
2564
log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail);2565
_legacyGCLogging.lastFlag = 2;
2566
_legacyGCLogging.file = os::strdup_check_oom(tail);
2567
} else if (match_option(option, "-Xlog", &tail)) {2569
if (strcmp(tail, ":help") == 0) {2570
fileStream stream(defaultStream::output_stream());
2571
LogConfiguration::print_command_line_help(&stream);
2573
} else if (strcmp(tail, ":disable") == 0) {2574
LogConfiguration::disable_logging();
2576
} else if (strcmp(tail, ":async") == 0) {2577
LogConfiguration::set_async_mode(true);
2579
} else if (*tail == '\0') {2580
ret = LogConfiguration::parse_command_line_arguments();
2581
assert(ret, "-Xlog without arguments should never fail to parse");
2582
} else if (*tail == ':') {2583
ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2586
jio_fprintf(defaultStream::error_stream(),
2587
"Invalid -Xlog option '-Xlog%s', see error log for details.\n",
2592
} else if (match_option(option, "-Xcheck", &tail)) {2593
if (!strcmp(tail, ":jni")) {2594
#if !INCLUDE_JNI_CHECK
2595
warning("JNI CHECKING is not supported in this VM");2597
CheckJNICalls = true;
2598
#endif // INCLUDE_JNI_CHECK
2599
} else if (is_bad_option(option, args->ignoreUnrecognized,
2603
} else if (match_option(option, "vfprintf")) {2604
_vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2605
} else if (match_option(option, "exit")) {2606
_exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2607
} else if (match_option(option, "abort")) {2608
_abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2609
// Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2610
// and the last option wins.
2611
} else if (match_option(option, "-XX:+NeverTenure")) {2612
if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) {2615
if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {2618
if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) {2621
} else if (match_option(option, "-XX:+AlwaysTenure")) {2622
if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {2625
if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {2628
if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) {2631
} else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {2632
uint max_tenuring_thresh = 0;
2633
if (!parse_uint(tail, &max_tenuring_thresh, 0)) {2634
jio_fprintf(defaultStream::error_stream(),
2635
"Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2639
if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) {2643
if (MaxTenuringThreshold == 0) {2644
if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {2647
if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) {2651
if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) {2654
if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) {2658
} else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {2659
if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) {2662
if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) {2665
} else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {2666
if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) {2669
if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) {2672
} else if (match_option(option, "-XX:+ErrorFileToStderr")) {2673
if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) {2676
if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) {2679
} else if (match_option(option, "-XX:+ErrorFileToStdout")) {2680
if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) {2683
if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) {2686
} else if (match_option(option, "--finalization=", &tail)) {2687
if (strcmp(tail, "enabled") == 0) {2688
InstanceKlass::set_finalization_enabled(true);
2689
} else if (strcmp(tail, "disabled") == 0) {2690
InstanceKlass::set_finalization_enabled(false);
2692
jio_fprintf(defaultStream::error_stream(),
2693
"Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n",
2697
#if !defined(DTRACE_ENABLED)
2698
} else if (match_option(option, "-XX:+DTraceMethodProbes")) {2699
jio_fprintf(defaultStream::error_stream(),
2700
"DTraceMethodProbes flag is not applicable for this configuration\n");
2702
} else if (match_option(option, "-XX:+DTraceAllocProbes")) {2703
jio_fprintf(defaultStream::error_stream(),
2704
"DTraceAllocProbes flag is not applicable for this configuration\n");
2706
} else if (match_option(option, "-XX:+DTraceMonitorProbes")) {2707
jio_fprintf(defaultStream::error_stream(),
2708
"DTraceMonitorProbes flag is not applicable for this configuration\n");
2710
#endif // !defined(DTRACE_ENABLED)
2712
} else if (match_option(option, "-XX:+FullGCALot")) {2713
if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) {2717
#if !INCLUDE_MANAGEMENT
2718
} else if (match_option(option, "-XX:+ManagementServer")) {2719
jio_fprintf(defaultStream::error_stream(),
2720
"ManagementServer is not supported in this VM.\n");
2722
#endif // INCLUDE_MANAGEMENT
2724
} else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) {2725
if (EnableJVMCIProduct) {2726
jio_fprintf(defaultStream::error_stream(),
2727
"-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n");
2730
} else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) {2731
bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT");
2732
if (use_graal_jit) {2733
const char* jvmci_compiler = get_property("jvmci.Compiler");2734
if (jvmci_compiler != nullptr) {2735
if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) {2736
jio_fprintf(defaultStream::error_stream(),
2737
"Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler);
2740
} else if (!add_property("jvmci.Compiler=graal")) {2745
// Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before
2746
if (EnableJVMCIProduct) {2749
JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct");2750
// Allow this flag if it has been unlocked.
2751
if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) {2752
if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) {2753
jio_fprintf(defaultStream::error_stream(),
2754
"Unable to enable JVMCI in product mode\n");
2758
// The flag was locked so process normally to report that error
2759
else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) {2762
#endif // INCLUDE_JVMCI
2764
} else if (match_jfr_option(&option)) {2767
} else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx2768
// Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
2769
// already been handled
2770
if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&2771
(strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {2772
if (!process_argument(tail, args->ignoreUnrecognized, origin)) {2777
} else if (is_bad_option(option, args->ignoreUnrecognized)) {2782
// PrintSharedArchiveAndExit will turn on
2784
// -Xlog:class+path=info
2785
if (PrintSharedArchiveAndExit) {2786
UseSharedSpaces = true;
2787
RequireSharedSpaces = true;
2788
LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path));
2796
void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) {2797
// For java.base check for duplicate --patch-module options being specified on the command line.
2798
// This check is only required for java.base, all other duplicate module specifications
2799
// will be checked during module system initialization. The module system initialization
2800
// will throw an ExceptionInInitializerError if this situation occurs.
2801
if (strcmp(module_name, JAVA_BASE_NAME) == 0) {2802
if (*patch_mod_javabase) {2803
vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module");2805
*patch_mod_javabase = true;
2809
// Create GrowableArray lazily, only if --patch-module has been specified
2810
if (_patch_mod_prefix == nullptr) {2811
_patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments);
2814
_patch_mod_prefix->push(new ModulePatchPath(module_name, path));
2817
// Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
2819
// This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar2820
// in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
2821
// Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
2822
// path is treated as the current directory.
2824
// This causes problems with CDS, which requires that all directories specified in the classpath
2825
// must be empty. In most cases, applications do NOT want to load classes from the current
2826
// directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
2827
// scripts compatible with CDS.
2828
void Arguments::fix_appclasspath() {2829
if (IgnoreEmptyClassPaths) {2830
const char separator = *os::path_separator();
2831
const char* src = _java_class_path->value();
2833
// skip over all the leading empty paths
2834
while (*src == separator) {2838
char* copy = os::strdup_check_oom(src, mtArguments);
2840
// trim all trailing empty paths
2841
for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {2845
char from[3] = {separator, separator, '\0'};2846
char to [2] = {separator, '\0'};2847
while (StringUtils::replace_no_expand(copy, from, to) > 0) {2848
// Keep replacing "::" -> ":" until we have no more "::" (non-windows)
2849
// Keep replacing ";;" -> ";" until we have no more ";;" (windows)
2852
_java_class_path->set_writeable_value(copy);
2853
FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
2857
jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) {2858
// check if the default lib/endorsed directory exists; if so, error
2859
char path[JVM_MAXPATHLEN];
2860
const char* fileSep = os::file_separator();
2861
jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
2863
DIR* dir = os::opendir(path);
2864
if (dir != nullptr) {2865
jio_fprintf(defaultStream::output_stream(),
2866
"<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
2867
"in modular form will be supported via the concept of upgradeable modules.\n");
2872
jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
2873
dir = os::opendir(path);
2874
if (dir != nullptr) {2875
jio_fprintf(defaultStream::output_stream(),
2876
"<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
2877
"Use -classpath instead.\n.");
2882
// This must be done after all arguments have been processed
2883
// and the container support has been initialized since AggressiveHeap
2884
// relies on the amount of total memory available.
2885
if (AggressiveHeap) {2886
jint result = set_aggressive_heap_flags();
2887
if (result != JNI_OK) {2892
// CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
2893
// but like -Xint, leave compilation thresholds unaffected.
2894
// With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
2895
if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {2896
set_mode_flags(_int);
2900
// Zero always runs in interpreted mode
2901
set_mode_flags(_int);
2904
// eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
2905
if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {2906
FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold);
2909
#if !COMPILER2_OR_JVMCI
2910
// Don't degrade server performance for footprint
2911
if (FLAG_IS_DEFAULT(UseLargePages) &&
2912
MaxHeapSize < LargePageHeapSizeThreshold) {2913
// No need for large granularity pages w/small heaps.
2914
// Note that large pages are enabled/disabled for both the
2915
// Java heap and the code cache.
2916
FLAG_SET_DEFAULT(UseLargePages, false);
2919
UNSUPPORTED_OPTION(ProfileInterpreter);
2922
// Parse the CompilationMode flag
2923
if (!CompilationModeFlag::initialize()) {2927
if (!check_vm_args_consistency()) {2931
if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) {2935
#ifndef CAN_SHOW_REGISTERS_ON_ASSERT
2936
UNSUPPORTED_OPTION(ShowRegistersOnAssert);
2937
#endif // CAN_SHOW_REGISTERS_ON_ASSERT
2942
// Helper class for controlling the lifetime of JavaVMInitArgs
2943
// objects. The contents of the JavaVMInitArgs are guaranteed to be
2944
// deleted on the destruction of the ScopedVMInitArgs object.
2945
class ScopedVMInitArgs : public StackObj {2947
JavaVMInitArgs _args;
2948
char* _container_name;
2950
char* _vm_options_file_arg;
2953
ScopedVMInitArgs(const char *container_name) {2954
_args.version = JNI_VERSION_1_2;
2956
_args.options = nullptr;
2957
_args.ignoreUnrecognized = false;
2958
_container_name = (char *)container_name;
2960
_vm_options_file_arg = nullptr;
2963
// Populates the JavaVMInitArgs object represented by this
2964
// ScopedVMInitArgs object with the arguments in options. The
2965
// allocated memory is deleted by the destructor. If this method
2966
// returns anything other than JNI_OK, then this object is in a
2967
// partially constructed state, and should be abandoned.
2968
jint set_args(const GrowableArrayView<JavaVMOption>* options) {2970
JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
2971
JavaVMOption, options->length(), mtArguments);
2972
if (options_arr == nullptr) {2975
_args.options = options_arr;
2977
for (int i = 0; i < options->length(); i++) {2978
options_arr[i] = options->at(i);
2979
options_arr[i].optionString = os::strdup(options_arr[i].optionString);
2980
if (options_arr[i].optionString == nullptr) {2981
// Rely on the destructor to do cleanup.
2987
_args.nOptions = options->length();
2988
_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2992
JavaVMInitArgs* get() { return &_args; }2993
char* container_name() { return _container_name; }2994
bool is_set() { return _is_set; }2995
bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; }2996
char* vm_options_file_arg() { return _vm_options_file_arg; }2998
void set_vm_options_file_arg(const char *vm_options_file_arg) {2999
if (_vm_options_file_arg != nullptr) {3000
os::free(_vm_options_file_arg);
3002
_vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg);
3005
~ScopedVMInitArgs() {3006
if (_vm_options_file_arg != nullptr) {3007
os::free(_vm_options_file_arg);
3009
if (_args.options == nullptr) return;
3010
for (int i = 0; i < _args.nOptions; i++) {3011
os::free(_args.options[i].optionString);
3013
FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3016
// Insert options into this option list, to replace option at
3017
// vm_options_file_pos (-XX:VMOptionsFile)
3018
jint insert(const JavaVMInitArgs* args,
3019
const JavaVMInitArgs* args_to_insert,
3020
const int vm_options_file_pos) {3021
assert(_args.options == nullptr, "shouldn't be set yet");
3022
assert(args_to_insert->nOptions != 0, "there should be args to insert");
3023
assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3025
int length = args->nOptions + args_to_insert->nOptions - 1;
3026
// Construct new option array
3027
GrowableArrayCHeap<JavaVMOption, mtArguments> options(length);
3028
for (int i = 0; i < args->nOptions; i++) {3029
if (i == vm_options_file_pos) {3030
// insert the new options starting at the same place as the
3031
// -XX:VMOptionsFile option
3032
for (int j = 0; j < args_to_insert->nOptions; j++) {3033
options.push(args_to_insert->options[j]);
3036
options.push(args->options[i]);
3039
// make into options array
3040
return set_args(&options);
3044
jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {3045
return parse_options_environment_variable("_JAVA_OPTIONS", args);3048
jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {3049
return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);3052
jint Arguments::parse_options_environment_variable(const char* name,
3053
ScopedVMInitArgs* vm_args) {3054
char *buffer = ::getenv(name);
3056
// Don't check this environment variable if user has special privileges
3057
// (e.g. unix su command).
3058
if (buffer == nullptr || os::have_special_privileges()) {3062
if ((buffer = os::strdup(buffer)) == nullptr) {3066
jio_fprintf(defaultStream::error_stream(),
3067
"Picked up %s: %s\n", name, buffer);
3069
int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3075
jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {3076
// read file into buffer
3077
int fd = ::open(file_name, O_RDONLY);
3079
jio_fprintf(defaultStream::error_stream(),
3080
"Could not open options file '%s'\n",
3086
int retcode = os::stat(file_name, &stbuf);
3088
jio_fprintf(defaultStream::error_stream(),
3089
"Could not stat options file '%s'\n",
3095
if (stbuf.st_size == 0) {3096
// tell caller there is no option data and that is ok
3101
// '+ 1' for null termination even with max bytes
3102
size_t bytes_alloc = stbuf.st_size + 1;
3104
char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments);
3105
if (nullptr == buf) {3106
jio_fprintf(defaultStream::error_stream(),
3107
"Could not allocate read buffer for options file parse\n");
3112
memset(buf, 0, bytes_alloc);
3115
ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3117
if (bytes_read < 0) {3118
FREE_C_HEAP_ARRAY(char, buf);
3119
jio_fprintf(defaultStream::error_stream(),
3120
"Could not read options file '%s'\n", file_name);
3124
if (bytes_read == 0) {3125
// tell caller there is no option data and that is ok
3126
FREE_C_HEAP_ARRAY(char, buf);
3130
retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3132
FREE_C_HEAP_ARRAY(char, buf);
3136
jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {3137
// Construct option array
3138
GrowableArrayCHeap<JavaVMOption, mtArguments> options(2);
3140
// some pointers to help with parsing
3141
char *buffer_end = buffer + buf_len;
3142
char *opt_hd = buffer;
3146
// parse all options
3147
while (rd < buffer_end) {3148
// skip leading white space from the input string
3149
while (rd < buffer_end && isspace((unsigned char) *rd)) {3153
if (rd >= buffer_end) {3157
// Remember this is where we found the head of the token.
3160
// Tokens are strings of non white space characters separated
3161
// by one or more white spaces.
3162
while (rd < buffer_end && !isspace((unsigned char) *rd)) {3163
if (*rd == '\'' || *rd == '"') { // handle a quoted string3164
int quote = *rd; // matching quote to look for
3165
rd++; // don't copy open quote
3166
while (rd < buffer_end && *rd != quote) {3167
// include everything (even spaces)
3168
// up until the close quote
3169
*wrt++ = *rd++; // copy to option string
3172
if (rd < buffer_end) {3173
rd++; // don't copy close quote
3175
// did not see closing quote
3176
jio_fprintf(defaultStream::error_stream(),
3177
"Unmatched quote in %s\n", name);
3181
*wrt++ = *rd++; // copy to option string
3185
// steal a white space character and set it to null
3187
// We now have a complete token
3189
JavaVMOption option;
3190
option.optionString = opt_hd;
3191
option.extraInfo = nullptr;
3193
options.append(option); // Fill in option
3195
rd++; // Advance to next character
3198
// Fill out JavaVMInitArgs structure.
3199
return vm_args->set_args(&options);
3203
// Determine whether LogVMOutput should be implicitly turned on.
3204
static bool use_vm_log() {3205
if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3206
PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3207
PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3208
PrintAssembly || TraceDeoptimization ||
3209
(VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {3214
if (PrintC1Statistics) {3220
if (PrintOptoAssembly || PrintOptoStatistics) {3230
bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) {3231
for (int index = 0; index < args->nOptions; index++) {3232
const JavaVMOption* option = args->options + index;
3234
if (match_option(option, "-XX:VMOptionsFile=", &tail)) {3241
jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3242
const char* vm_options_file,
3243
const int vm_options_file_pos,
3244
ScopedVMInitArgs* vm_options_file_args,
3245
ScopedVMInitArgs* args_out) {3246
jint code = parse_vm_options_file(vm_options_file, vm_options_file_args);
3247
if (code != JNI_OK) {3251
if (vm_options_file_args->get()->nOptions < 1) {3255
if (args_contains_vm_options_file_arg(vm_options_file_args->get())) {3256
jio_fprintf(defaultStream::error_stream(),
3257
"A VM options file may not refer to a VM options file. "
3258
"Specification of '-XX:VMOptionsFile=<file-name>' in the "
3259
"options file '%s' in options container '%s' is an error.\n",
3260
vm_options_file_args->vm_options_file_arg(),
3261
vm_options_file_args->container_name());
3265
return args_out->insert(args, vm_options_file_args->get(),
3266
vm_options_file_pos);
3269
// Expand -XX:VMOptionsFile found in args_in as needed.
3270
// mod_args and args_out parameters may return values as needed.
3271
jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in,
3272
ScopedVMInitArgs* mod_args,
3273
JavaVMInitArgs** args_out) {3274
jint code = match_special_option_and_act(args_in, mod_args);
3275
if (code != JNI_OK) {3279
if (mod_args->is_set()) {3280
// args_in contains -XX:VMOptionsFile and mod_args contains the
3281
// original options from args_in along with the options expanded
3282
// from the VMOptionsFile. Return a short-hand to the caller.
3283
*args_out = mod_args->get();
3285
*args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in
3290
jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3291
ScopedVMInitArgs* args_out) {3292
// Remaining part of option string
3294
ScopedVMInitArgs vm_options_file_args(args_out->container_name());
3296
for (int index = 0; index < args->nOptions; index++) {3297
const JavaVMOption* option = args->options + index;
3298
if (match_option(option, "-XX:Flags=", &tail)) {3299
Arguments::set_jvm_flags_file(tail);
3302
if (match_option(option, "-XX:VMOptionsFile=", &tail)) {3303
if (vm_options_file_args.found_vm_options_file_arg()) {3304
jio_fprintf(defaultStream::error_stream(),
3305
"The option '%s' is already specified in the options "
3306
"container '%s' so the specification of '%s' in the "
3307
"same options container is an error.\n",
3308
vm_options_file_args.vm_options_file_arg(),
3309
vm_options_file_args.container_name(),
3310
option->optionString);
3313
vm_options_file_args.set_vm_options_file_arg(option->optionString);
3314
// If there's a VMOptionsFile, parse that
3315
jint code = insert_vm_options_file(args, tail, index,
3316
&vm_options_file_args, args_out);
3317
if (code != JNI_OK) {3320
args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg());
3321
if (args_out->is_set()) {3322
// The VMOptions file inserted some options so switch 'args'
3323
// to the new set of options, and continue processing which
3324
// preserves "last option wins" semantics.
3325
args = args_out->get();
3326
// The first option from the VMOptionsFile replaces the
3327
// current option. So we back track to process the
3328
// replacement option.
3333
if (match_option(option, "-XX:+PrintVMOptions")) {3334
PrintVMOptions = true;
3337
if (match_option(option, "-XX:-PrintVMOptions")) {3338
PrintVMOptions = false;
3341
if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {3342
IgnoreUnrecognizedVMOptions = true;
3345
if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {3346
IgnoreUnrecognizedVMOptions = false;
3349
if (match_option(option, "-XX:+PrintFlagsInitial")) {3350
JVMFlag::printFlags(tty, false);
3355
if (match_option(option, "-XX:+PrintFlagsWithComments")) {3356
JVMFlag::printFlags(tty, true);
3364
static void print_options(const JavaVMInitArgs *args) {3366
for (int index = 0; index < args->nOptions; index++) {3367
const JavaVMOption *option = args->options + index;
3368
if (match_option(option, "-XX:", &tail)) {3374
bool Arguments::handle_deprecated_print_gc_flags() {3376
log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead.");3378
if (PrintGCDetails) {3379
log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead.");3382
if (_legacyGCLogging.lastFlag == 2) {3383
// -Xloggc was used to specify a filename
3384
const char* gc_conf = PrintGCDetails ? "gc*" : "gc";
3386
LogTarget(Error, logging) target;
3387
LogStream errstream(target);
3388
return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream);
3389
} else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) {3390
LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc));
3395
static void apply_debugger_ergo() {3397
if (ReplayCompiles) {3398
FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true);
3401
if (UseDebuggerErgo) {3402
// Turn on sub-flags
3403
FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true);
3404
FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true);
3407
if (UseDebuggerErgo2) {3408
// Debugging with limited number of CPUs
3409
FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false);
3410
FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1);
3411
FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1);
3412
FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2);
3417
// Parse entry point called from JNI_CreateJavaVM
3419
jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {3420
assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent");
3421
JVMFlag::check_all_flag_declarations();
3423
// If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3424
const char* hotspotrc = ".hotspotrc";
3425
bool settings_file_specified = false;
3426
bool needs_hotspotrc_warning = false;
3427
ScopedVMInitArgs initial_vm_options_args("");3428
ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");3429
ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'");3431
// Pointers to current working set of containers
3432
JavaVMInitArgs* cur_cmd_args;
3433
JavaVMInitArgs* cur_vm_options_args;
3434
JavaVMInitArgs* cur_java_options_args;
3435
JavaVMInitArgs* cur_java_tool_options_args;
3437
// Containers for modified/expanded options
3438
ScopedVMInitArgs mod_cmd_args("cmd_line_args");3439
ScopedVMInitArgs mod_vm_options_args("vm_options_args");3440
ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'");3441
ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'");3445
parse_java_tool_options_environment_variable(&initial_java_tool_options_args);
3446
if (code != JNI_OK) {3450
code = parse_java_options_environment_variable(&initial_java_options_args);
3451
if (code != JNI_OK) {3455
// Parse the options in the /java.base/jdk/internal/vm/options resource, if present
3456
char *vmoptions = ClassLoader::lookup_vm_options();
3457
if (vmoptions != nullptr) {3458
code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args);3459
FREE_C_HEAP_ARRAY(char, vmoptions);
3460
if (code != JNI_OK) {3465
code = expand_vm_options_as_needed(initial_java_tool_options_args.get(),
3466
&mod_java_tool_options_args,
3467
&cur_java_tool_options_args);
3468
if (code != JNI_OK) {3472
code = expand_vm_options_as_needed(initial_cmd_args,
3475
if (code != JNI_OK) {3479
code = expand_vm_options_as_needed(initial_java_options_args.get(),
3480
&mod_java_options_args,
3481
&cur_java_options_args);
3482
if (code != JNI_OK) {3486
code = expand_vm_options_as_needed(initial_vm_options_args.get(),
3487
&mod_vm_options_args,
3488
&cur_vm_options_args);
3489
if (code != JNI_OK) {3493
const char* flags_file = Arguments::get_jvm_flags_file();
3494
settings_file_specified = (flags_file != nullptr);
3496
if (IgnoreUnrecognizedVMOptions) {3497
cur_cmd_args->ignoreUnrecognized = true;
3498
cur_java_tool_options_args->ignoreUnrecognized = true;
3499
cur_java_options_args->ignoreUnrecognized = true;
3502
// Parse specified settings file
3503
if (settings_file_specified) {3504
if (!process_settings_file(flags_file, true,
3505
cur_cmd_args->ignoreUnrecognized)) {3510
// Parse default .hotspotrc settings file
3511
if (!process_settings_file(".hotspotrc", false,3512
cur_cmd_args->ignoreUnrecognized)) {3517
if (os::stat(hotspotrc, &buf) == 0) {3518
needs_hotspotrc_warning = true;
3523
if (PrintVMOptions) {3524
print_options(cur_java_tool_options_args);
3525
print_options(cur_cmd_args);
3526
print_options(cur_java_options_args);
3529
// Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3530
jint result = parse_vm_init_args(cur_vm_options_args,
3531
cur_java_tool_options_args,
3532
cur_java_options_args,
3535
if (result != JNI_OK) {3539
// Delay warning until here so that we've had a chance to process
3540
// the -XX:-PrintWarnings flag
3541
if (needs_hotspotrc_warning) {3542
warning("%s file is present but has been ignored. "3543
"Run with -XX:Flags=%s to load the file.",
3544
hotspotrc, hotspotrc);
3547
if (needs_module_property_warning) {3548
warning("Ignoring system property options whose names match the '-Djdk.module.*'."3549
" names that are reserved for internal use.");
3552
#if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3553
UNSUPPORTED_OPTION(UseLargePages);
3557
UNSUPPORTED_OPTION_NULL(AllocateHeapAt);
3561
if (TraceBytecodesAt != 0) {3562
TraceBytecodes = true;
3566
if (ScavengeRootsInCode == 0) {3567
if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {3568
warning("Forcing ScavengeRootsInCode non-zero");3570
ScavengeRootsInCode = 1;
3573
if (!handle_deprecated_print_gc_flags()) {3577
// Set object alignment values.
3578
set_object_alignment();
3581
if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) {3582
jio_fprintf(defaultStream::error_stream(),
3583
"Shared spaces are not supported in this VM\n");
3586
if (DumpLoadedClassList != nullptr) {3587
jio_fprintf(defaultStream::error_stream(),
3588
"DumpLoadedClassList is not supported in this VM\n");
3591
if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) ||
3592
log_is_enabled(Info, cds)) {3593
warning("Shared spaces are not supported in this VM");3594
UseSharedSpaces = false;
3595
LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds));
3597
no_shared_spaces("CDS Disabled");3598
#endif // INCLUDE_CDS
3600
// Verify NMT arguments
3601
const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking);
3602
if (lvl == NMT_unknown) {3603
jio_fprintf(defaultStream::error_stream(),
3604
"Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n");
3607
if (PrintNMTStatistics && lvl == NMT_off) {3608
warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");3609
FLAG_SET_DEFAULT(PrintNMTStatistics, false);
3612
bool trace_dependencies = log_is_enabled(Debug, dependencies);
3613
if (trace_dependencies && VerifyDependencies) {3614
warning("dependency logging results may be inflated by VerifyDependencies");3617
bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) ||
3618
log_is_enabled(Info, class, load, cause);
3619
if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) {3620
warning("class load cause logging will not produce output without LogClassLoadingCauseFor");3623
apply_debugger_ergo();
3625
// The VMThread needs to stop now and then to execute these debug options.
3626
if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) {3627
FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000);
3630
if (log_is_enabled(Info, arguments)) {3631
LogStream st(Log(arguments)::info());
3632
Arguments::print_on(&st);
3638
jint Arguments::apply_ergo() {3639
// Set flags based on ergonomics.
3640
jint result = set_ergonomics_flags();
3641
if (result != JNI_OK) return result;
3643
// Set heap size based on available physical memory
3646
GCConfig::arguments()->initialize();
3648
CDSConfig::initialize();
3650
// Initialize Metaspace flags and alignments
3651
Metaspace::ergo_initialize();
3653
if (!StringDedup::ergo_initialize()) {3657
// Set compiler flags after GC is selected and GC specific
3658
// flags (LoopStripMiningIter) are set.
3659
CompilerConfig::ergo_initialize();
3661
// Set bytecode rewriting flags
3662
set_bytecode_flags();
3664
// Set flags if aggressive optimization flags are enabled
3665
jint code = set_aggressive_opts_flags();
3666
if (code != JNI_OK) {3670
if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) {3671
FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table());
3672
} else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) {3673
warning("UseSecondarySupersTable is not supported");3674
FLAG_SET_DEFAULT(UseSecondarySupersTable, false);
3676
if (!UseSecondarySupersTable) {3677
FLAG_SET_DEFAULT(StressSecondarySupers, false);
3678
FLAG_SET_DEFAULT(VerifySecondarySupers, false);
3682
// Clear flags not supported on zero.
3683
FLAG_SET_DEFAULT(ProfileInterpreter, false);
3686
if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {3687
warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");3688
DebugNonSafepoints = true;
3691
if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {3692
warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");3695
// Treat the odd case where local verification is enabled but remote
3696
// verification is not as if both were enabled.
3697
if (BytecodeVerificationLocal && !BytecodeVerificationRemote) {3698
log_info(verification)("Turning on remote verification because local verification is on");3699
FLAG_SET_DEFAULT(BytecodeVerificationRemote, true);
3703
if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {3710
if (PrintCommandLineFlags) {3711
JVMFlag::printSetFlags(tty);
3714
#if COMPILER2_OR_JVMCI
3715
if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) {3716
if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) {3717
warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off.");3719
FLAG_SET_DEFAULT(EnableVectorReboxing, false);
3721
if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) {3722
if (!EnableVectorReboxing) {3723
warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off.");3725
warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off.");3728
FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false);
3730
if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) {3731
warning("Disabling UseVectorStubs since EnableVectorSupport is turned off.");3733
FLAG_SET_DEFAULT(UseVectorStubs, false);
3735
#endif // COMPILER2_OR_JVMCI
3737
if (log_is_enabled(Info, perf, class, link)) {3739
warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off.");3740
LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link));
3744
if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) {3745
if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) {3746
LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses));
3752
jint Arguments::adjust_after_os() {3754
if (UseParallelGC) {3755
if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {3756
FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3763
int Arguments::PropertyList_count(SystemProperty* pl) {3765
while(pl != nullptr) {3772
// Return the number of readable properties.
3773
int Arguments::PropertyList_readable_count(SystemProperty* pl) {3775
while(pl != nullptr) {3776
if (pl->readable()) {3784
const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {3785
assert(key != nullptr, "just checking");
3786
SystemProperty* prop;
3787
for (prop = pl; prop != nullptr; prop = prop->next()) {3788
if (strcmp(key, prop->key()) == 0) return prop->value();
3793
// Return the value of the requested property provided that it is a readable property.
3794
const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) {3795
assert(key != nullptr, "just checking");
3796
SystemProperty* prop;
3797
// Return the property value if the keys match and the property is not internal or
3798
// it's the special internal property "jdk.boot.class.path.append".
3799
for (prop = pl; prop != nullptr; prop = prop->next()) {3800
if (strcmp(key, prop->key()) == 0) {3801
if (!prop->internal()) {3802
return prop->value();
3803
} else if (strcmp(key, "jdk.boot.class.path.append") == 0) {3804
return prop->value();
3806
// Property is internal and not jdk.boot.class.path.append so return null.
3814
void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {3815
SystemProperty* p = *plist;
3819
while (p->next() != nullptr) {3826
void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v,
3827
bool writeable, bool internal) {3828
if (plist == nullptr)
3831
SystemProperty* new_p = new SystemProperty(k, v, writeable, internal);
3832
PropertyList_add(plist, new_p);
3835
void Arguments::PropertyList_add(SystemProperty *element) {3836
PropertyList_add(&_system_properties, element);
3839
// This add maintains unique property key in the list.
3840
void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
3841
PropertyAppendable append, PropertyWriteable writeable,
3842
PropertyInternal internal) {3843
if (plist == nullptr)
3846
// If property key exists and is writeable, then update with new value.
3847
// Trying to update a non-writeable property is silently ignored.
3848
SystemProperty* prop;
3849
for (prop = *plist; prop != nullptr; prop = prop->next()) {3850
if (strcmp(k, prop->key()) == 0) {3851
if (append == AppendProperty) {3852
prop->append_writeable_value(v);
3854
prop->set_writeable_value(v);
3860
PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty);
3863
// Copies src into buf, replacing "%%" with "%" and "%p" with pid
3864
// Returns true if all of the source pointed by src has been copied over to
3865
// the destination buffer pointed by buf. Otherwise, returns false.
3867
// 1. If the length (buflen) of the destination buffer excluding the
3868
// null terminator character is not long enough for holding the expanded
3869
// pid characters, it also returns false instead of returning the partially
3871
// 2. The passed in "buflen" should be large enough to hold the null terminator.
3872
bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3873
char* buf, size_t buflen) {3874
const char* p = src;
3876
const char* src_end = &src[srclen];
3877
char* buf_end = &buf[buflen - 1];
3879
while (p < src_end && b < buf_end) {3882
case '%': // "%%" ==> "%"
3885
case 'p': { // "%p" ==> current process id3886
// buf_end points to the character before the last character so
3887
// that we could write '\0' to the end of the buffer.
3888
size_t buf_sz = buf_end - b + 1;
3889
int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3891
// if jio_snprintf fails or the buffer is not long enough to hold
3892
// the expanded pid, returns false.
3893
if (ret < 0 || ret >= (int)buf_sz) {3897
assert(*b == '\0', "fail in copy_expand_pid");
3898
if (p == src_end && b == buf_end + 1) {3899
// reach the end of the buffer.
3914
return (p == src_end); // return false if not all of the source was copied