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/*
* Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "cds/cds_globals.hpp"
#include "cds/filemap.hpp"
#include "classfile/classLoader.hpp"
#include "classfile/javaAssertions.hpp"
#include "classfile/moduleEntry.hpp"
#include "classfile/stringTable.hpp"
#include "classfile/symbolTable.hpp"
#include "compiler/compilerDefinitions.hpp"
#include "gc/shared/gcArguments.hpp"
#include "gc/shared/gcConfig.hpp"
#include "gc/shared/stringdedup/stringDedup.hpp"
#include "gc/shared/tlab_globals.hpp"
#include "jvm.h"
#include "logging/log.hpp"
#include "logging/logConfiguration.hpp"
#include "logging/logStream.hpp"
#include "logging/logTag.hpp"
#include "memory/allocation.inline.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/oop.inline.hpp"
#include "prims/jvmtiExport.hpp"
#include "runtime/arguments.hpp"
#include "runtime/flags/jvmFlag.hpp"
#include "runtime/flags/jvmFlagAccess.hpp"
#include "runtime/flags/jvmFlagLimit.hpp"
#include "runtime/globals_extension.hpp"
#include "runtime/java.hpp"
#include "runtime/os.hpp"
#include "runtime/safepoint.hpp"
#include "runtime/safepointMechanism.hpp"
#include "runtime/synchronizer.hpp"
#include "runtime/vm_version.hpp"
#include "services/management.hpp"
#include "services/nmtCommon.hpp"
#include "utilities/align.hpp"
#include "utilities/debug.hpp"
#include "utilities/defaultStream.hpp"
#include "utilities/macros.hpp"
#include "utilities/parseInteger.hpp"
#include "utilities/powerOfTwo.hpp"
#include "utilities/stringUtils.hpp"
#if INCLUDE_JFR
#include "jfr/jfr.hpp"
#endif
#include <limits>
#define DEFAULT_JAVA_LAUNCHER "generic"
char* Arguments::_jvm_flags_file = NULL;
char** Arguments::_jvm_flags_array = NULL;
int Arguments::_num_jvm_flags = 0;
char** Arguments::_jvm_args_array = NULL;
int Arguments::_num_jvm_args = 0;
char* Arguments::_java_command = NULL;
SystemProperty* Arguments::_system_properties = NULL;
size_t Arguments::_conservative_max_heap_alignment = 0;
Arguments::Mode Arguments::_mode = _mixed;
bool Arguments::_java_compiler = false;
bool Arguments::_xdebug_mode = false;
const char* Arguments::_java_vendor_url_bug = NULL;
const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
bool Arguments::_sun_java_launcher_is_altjvm = false;
// These parameters are reset in method parse_vm_init_args()
bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
bool Arguments::_BackgroundCompilation = BackgroundCompilation;
bool Arguments::_ClipInlining = ClipInlining;
size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress;
bool Arguments::_enable_preview = false;
char* Arguments::SharedArchivePath = NULL;
char* Arguments::SharedDynamicArchivePath = NULL;
LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 };
AgentLibraryList Arguments::_libraryList;
AgentLibraryList Arguments::_agentList;
// These are not set by the JDK's built-in launchers, but they can be set by
// programs that embed the JVM using JNI_CreateJavaVM. See comments around
// JavaVMOption in jni.h.
abort_hook_t Arguments::_abort_hook = NULL;
exit_hook_t Arguments::_exit_hook = NULL;
vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
SystemProperty *Arguments::_sun_boot_library_path = NULL;
SystemProperty *Arguments::_java_library_path = NULL;
SystemProperty *Arguments::_java_home = NULL;
SystemProperty *Arguments::_java_class_path = NULL;
SystemProperty *Arguments::_jdk_boot_class_path_append = NULL;
SystemProperty *Arguments::_vm_info = NULL;
GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL;
PathString *Arguments::_boot_class_path = NULL;
bool Arguments::_has_jimage = false;
char* Arguments::_ext_dirs = NULL;
// True if -Xshare:auto option was specified.
static bool xshare_auto_cmd_line = false;
bool PathString::set_value(const char *value, AllocFailType alloc_failmode) {
char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode);
if (new_value == NULL) {
assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be");
return false;
}
if (_value != NULL) {
FreeHeap(_value);
}
_value = new_value;
strcpy(_value, value);
return true;
}
void PathString::append_value(const char *value) {
char *sp;
size_t len = 0;
if (value != NULL) {
len = strlen(value);
if (_value != NULL) {
len += strlen(_value);
}
sp = AllocateHeap(len+2, mtArguments);
assert(sp != NULL, "Unable to allocate space for new append path value");
if (sp != NULL) {
if (_value != NULL) {
strcpy(sp, _value);
strcat(sp, os::path_separator());
strcat(sp, value);
FreeHeap(_value);
} else {
strcpy(sp, value);
}
_value = sp;
}
}
}
PathString::PathString(const char* value) {
if (value == NULL) {
_value = NULL;
} else {
_value = AllocateHeap(strlen(value)+1, mtArguments);
strcpy(_value, value);
}
}
PathString::~PathString() {
if (_value != NULL) {
FreeHeap(_value);
_value = NULL;
}
}
ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) {
assert(module_name != NULL && path != NULL, "Invalid module name or path value");
size_t len = strlen(module_name) + 1;
_module_name = AllocateHeap(len, mtInternal);
strncpy(_module_name, module_name, len); // copy the trailing null
_path = new PathString(path);
}
ModulePatchPath::~ModulePatchPath() {
if (_module_name != NULL) {
FreeHeap(_module_name);
_module_name = NULL;
}
if (_path != NULL) {
delete _path;
_path = NULL;
}
}
SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) {
if (key == NULL) {
_key = NULL;
} else {
_key = AllocateHeap(strlen(key)+1, mtArguments);
strcpy(_key, key);
}
_next = NULL;
_internal = internal;
_writeable = writeable;
}
AgentLibrary::AgentLibrary(const char* name, const char* options,
bool is_absolute_path, void* os_lib,
bool instrument_lib) {
_name = AllocateHeap(strlen(name)+1, mtArguments);
strcpy(_name, name);
if (options == NULL) {
_options = NULL;
} else {
_options = AllocateHeap(strlen(options)+1, mtArguments);
strcpy(_options, options);
}
_is_absolute_path = is_absolute_path;
_os_lib = os_lib;
_next = NULL;
_state = agent_invalid;
_is_static_lib = false;
_is_instrument_lib = instrument_lib;
}
// Check if head of 'option' matches 'name', and sets 'tail' to the remaining
// part of the option string.
static bool match_option(const JavaVMOption *option, const char* name,
const char** tail) {
size_t len = strlen(name);
if (strncmp(option->optionString, name, len) == 0) {
*tail = option->optionString + len;
return true;
} else {
return false;
}
}
// Check if 'option' matches 'name'. No "tail" is allowed.
static bool match_option(const JavaVMOption *option, const char* name) {
const char* tail = NULL;
bool result = match_option(option, name, &tail);
if (tail != NULL && *tail == '\0') {
return result;
} else {
return false;
}
}
// Return true if any of the strings in null-terminated array 'names' matches.
// If tail_allowed is true, then the tail must begin with a colon; otherwise,
// the option must match exactly.
static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
bool tail_allowed) {
for (/* empty */; *names != NULL; ++names) {
if (match_option(option, *names, tail)) {
if (**tail == '\0' || (tail_allowed && **tail == ':')) {
return true;
}
}
}
return false;
}
#if INCLUDE_JFR
static bool _has_jfr_option = false; // is using JFR
// return true on failure
static bool match_jfr_option(const JavaVMOption** option) {
assert((*option)->optionString != NULL, "invariant");
char* tail = NULL;
if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
_has_jfr_option = true;
return Jfr::on_start_flight_recording_option(option, tail);
} else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
_has_jfr_option = true;
return Jfr::on_flight_recorder_option(option, tail);
}
return false;
}
bool Arguments::has_jfr_option() {
return _has_jfr_option;
}
#endif
static void logOption(const char* opt) {
if (PrintVMOptions) {
jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
}
}
bool needs_module_property_warning = false;
#define MODULE_PROPERTY_PREFIX "jdk.module."
#define MODULE_PROPERTY_PREFIX_LEN 11
#define ADDEXPORTS "addexports"
#define ADDEXPORTS_LEN 10
#define ADDREADS "addreads"
#define ADDREADS_LEN 8
#define ADDOPENS "addopens"
#define ADDOPENS_LEN 8
#define PATCH "patch"
#define PATCH_LEN 5
#define ADDMODS "addmods"
#define ADDMODS_LEN 7
#define LIMITMODS "limitmods"
#define LIMITMODS_LEN 9
#define PATH "path"
#define PATH_LEN 4
#define UPGRADE_PATH "upgrade.path"
#define UPGRADE_PATH_LEN 12
#define ENABLE_NATIVE_ACCESS "enable.native.access"
#define ENABLE_NATIVE_ACCESS_LEN 20
void Arguments::add_init_library(const char* name, char* options) {
_libraryList.add(new AgentLibrary(name, options, false, NULL));
}
void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) {
_agentList.add(new AgentLibrary(name, options, absolute_path, NULL));
}
void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) {
_agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true));
}
// Late-binding agents not started via arguments
void Arguments::add_loaded_agent(AgentLibrary *agentLib) {
_agentList.add(agentLib);
}
// Return TRUE if option matches 'property', or 'property=', or 'property.'.
static bool matches_property_suffix(const char* option, const char* property, size_t len) {
return ((strncmp(option, property, len) == 0) &&
(option[len] == '=' || option[len] == '.' || option[len] == '\0'));
}
// Return true if property starts with "jdk.module." and its ensuing chars match
// any of the reserved module properties.
// property should be passed without the leading "-D".
bool Arguments::is_internal_module_property(const char* property) {
assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D");
if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) {
const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN;
if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) ||
matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) ||
matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) ||
matches_property_suffix(property_suffix, PATCH, PATCH_LEN) ||
matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) ||
matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) ||
matches_property_suffix(property_suffix, PATH, PATH_LEN) ||
matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) ||
matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) {
return true;
}
}
return false;
}
// Process java launcher properties.
void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
// See if sun.java.launcher or sun.java.launcher.is_altjvm is defined.
// Must do this before setting up other system properties,
// as some of them may depend on launcher type.
for (int index = 0; index < args->nOptions; index++) {
const JavaVMOption* option = args->options + index;
const char* tail;
if (match_option(option, "-Dsun.java.launcher=", &tail)) {
process_java_launcher_argument(tail, option->extraInfo);
continue;
}
if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
if (strcmp(tail, "true") == 0) {
_sun_java_launcher_is_altjvm = true;
}
continue;
}
}
}
// Initialize system properties key and value.
void Arguments::init_system_properties() {
// Set up _boot_class_path which is not a property but
// relies heavily on argument processing and the jdk.boot.class.path.append
// property. It is used to store the underlying boot class path.
_boot_class_path = new PathString(NULL);
PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
"Java Virtual Machine Specification", false));
PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false));
// Initialize the vm.info now, but it will need updating after argument parsing.
_vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true);
// Following are JVMTI agent writable properties.
// Properties values are set to NULL and they are
// os specific they are initialized in os::init_system_properties_values().
_sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
_java_library_path = new SystemProperty("java.library.path", NULL, true);
_java_home = new SystemProperty("java.home", NULL, true);
_java_class_path = new SystemProperty("java.class.path", "", true);
// jdk.boot.class.path.append is a non-writeable, internal property.
// It can only be set by either:
// - -Xbootclasspath/a:
// - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase
_jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", NULL, false, true);
// Add to System Property list.
PropertyList_add(&_system_properties, _sun_boot_library_path);
PropertyList_add(&_system_properties, _java_library_path);
PropertyList_add(&_system_properties, _java_home);
PropertyList_add(&_system_properties, _java_class_path);
PropertyList_add(&_system_properties, _jdk_boot_class_path_append);
PropertyList_add(&_system_properties, _vm_info);
// Set OS specific system properties values
os::init_system_properties_values();
}
// Update/Initialize System properties after JDK version number is known
void Arguments::init_version_specific_system_properties() {
enum { bufsz = 16 };
char buffer[bufsz];
const char* spec_vendor = "Oracle Corporation";
uint32_t spec_version = JDK_Version::current().major_version();
jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version);
PropertyList_add(&_system_properties,
new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
PropertyList_add(&_system_properties,
new SystemProperty("java.vm.specification.version", buffer, false));
PropertyList_add(&_system_properties,
new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
}
/*
* -XX argument processing:
*
* -XX arguments are defined in several places, such as:
* globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
* -XX arguments are parsed in parse_argument().
* -XX argument bounds checking is done in check_vm_args_consistency().
*
* Over time -XX arguments may change. There are mechanisms to handle common cases:
*
* ALIASED: An option that is simply another name for another option. This is often
* part of the process of deprecating a flag, but not all aliases need
* to be deprecated.
*
* Create an alias for an option by adding the old and new option names to the
* "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc).
*
* DEPRECATED: An option that is supported, but a warning is printed to let the user know that
* support may be removed in the future. Both regular and aliased options may be
* deprecated.
*
* Add a deprecation warning for an option (or alias) by adding an entry in the
* "special_jvm_flags" table and setting the "deprecated_in" field.
* Often an option "deprecated" in one major release will
* be made "obsolete" in the next. In this case the entry should also have its
* "obsolete_in" field set.
*
* OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted
* on the command line. A warning is printed to let the user know that option might not
* be accepted in the future.
*
* Add an obsolete warning for an option by adding an entry in the "special_jvm_flags"
* table and setting the "obsolete_in" field.
*
* EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal
* to the current JDK version. The system will flatly refuse to admit the existence of
* the flag. This allows a flag to die automatically over JDK releases.
*
* Note that manual cleanup of expired options should be done at major JDK version upgrades:
* - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables.
* - Newly obsolete or expired deprecated options should have their global variable
* definitions removed (from globals.hpp, etc) and related implementations removed.
*
* Recommended approach for removing options:
*
* To remove options commonly used by customers (e.g. product -XX options), use
* the 3-step model adding major release numbers to the deprecate, obsolete and expire columns.
*
* To remove internal options (e.g. diagnostic, experimental, develop options), use
* a 2-step model adding major release numbers to the obsolete and expire columns.
*
* To change the name of an option, use the alias table as well as a 2-step
* model adding major release numbers to the deprecate and expire columns.
* Think twice about aliasing commonly used customer options.
*
* There are times when it is appropriate to leave a future release number as undefined.
*
* Tests: Aliases should be tested in VMAliasOptions.java.
* Deprecated options should be tested in VMDeprecatedOptions.java.
*/
// The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The
// "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both.
// When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on
// the command-line as usual, but will issue a warning.
// When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on
// the command-line, while issuing a warning and ignoring the flag value.
// Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the
// existence of the flag.
//
// MANUAL CLEANUP ON JDK VERSION UPDATES:
// This table ensures that the handling of options will update automatically when the JDK
// version is incremented, but the source code needs to be cleanup up manually:
// - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals"
// variable should be removed, as well as users of the variable.
// - As "deprecated" options age into "obsolete" options, move the entry into the
// "Obsolete Flags" section of the table.
// - All expired options should be removed from the table.
static SpecialFlag const special_jvm_flags[] = {
// -------------- Deprecated Flags --------------
// --- Non-alias flags - sorted by obsolete_in then expired_in:
{ "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
{ "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
{ "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
{ "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
{ "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
{ "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() },
{ "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
{ "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
{ "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
{ "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() },
{ "EnableWaitForParallelLoad", JDK_Version::jdk(20), JDK_Version::jdk(21), JDK_Version::jdk(22) },
// --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
{ "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
{ "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
{ "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() },
// -------------- Obsolete Flags - sorted by expired_in --------------
{ "ExtendedDTraceProbes", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version::jdk(21) },
{ "UseContainerCpuShares", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version::jdk(21) },
{ "PreferContainerQuotaForCPUCount", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version::jdk(21) },
{ "AliasLevel", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version::jdk(21) },
{ "UseCodeAging", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(21) },
{ "PrintSharedDictionary", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(21) },
{ "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
{ "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
{ "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
{ "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
{ "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
{ "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() },
#ifdef ASSERT
{ "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() },
#endif
#ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS
// These entries will generate build errors. Their purpose is to test the macros.
{ "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() },
{ "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) },
{ "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) },
{ "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) },
{ "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) },
{ "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
{ "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
#endif
{ NULL, JDK_Version(0), JDK_Version(0) }
};
// Flags that are aliases for other flags.
typedef struct {
const char* alias_name;
const char* real_name;
} AliasedFlag;
static AliasedFlag const aliased_jvm_flags[] = {
{ "DefaultMaxRAMFraction", "MaxRAMFraction" },
{ "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
{ NULL, NULL}
};
// Return true if "v" is less than "other", where "other" may be "undefined".
static bool version_less_than(JDK_Version v, JDK_Version other) {
assert(!v.is_undefined(), "must be defined");
if (!other.is_undefined() && v.compare(other) >= 0) {
return false;
} else {
return true;
}
}
static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) {
for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
flag = special_jvm_flags[i];
return true;
}
}
return false;
}
bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) {
assert(version != NULL, "Must provide a version buffer");
SpecialFlag flag;
if (lookup_special_flag(flag_name, flag)) {
if (!flag.obsolete_in.is_undefined()) {
if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
*version = flag.obsolete_in;
// This flag may have been marked for obsoletion in this version, but we may not
// have actually removed it yet. Rather than ignoring it as soon as we reach
// this version we allow some time for the removal to happen. So if the flag
// still actually exists we process it as normal, but issue an adjusted warning.
const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name);
if (real_flag != NULL) {
char version_str[256];
version->to_string(version_str, sizeof(version_str));
warning("Temporarily processing option %s; support is scheduled for removal in %s",
flag_name, version_str);
return false;
}
return true;
}
}
}
return false;
}
int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
assert(version != NULL, "Must provide a version buffer");
SpecialFlag flag;
if (lookup_special_flag(flag_name, flag)) {
if (!flag.deprecated_in.is_undefined()) {
if (version_less_than(JDK_Version::current(), flag.obsolete_in) &&
version_less_than(JDK_Version::current(), flag.expired_in)) {
*version = flag.deprecated_in;
return 1;
} else {
return -1;
}
}
}
return 0;
}
const char* Arguments::real_flag_name(const char *flag_name) {
for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
const AliasedFlag& flag_status = aliased_jvm_flags[i];
if (strcmp(flag_status.alias_name, flag_name) == 0) {
return flag_status.real_name;
}
}
return flag_name;
}
#ifdef ASSERT
static bool lookup_special_flag(const char *flag_name, size_t skip_index) {
for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) {
return true;
}
}
return false;
}
// Verifies the correctness of the entries in the special_jvm_flags table.
// If there is a semantic error (i.e. a bug in the table) such as the obsoletion
// version being earlier than the deprecation version, then a warning is issued
// and verification fails - by returning false. If it is detected that the table
// is out of date, with respect to the current version, then ideally a warning is
// issued but verification does not fail. This allows the VM to operate when the
// version is first updated, without needing to update all the impacted flags at
// the same time. In practice we can't issue the warning immediately when the version
// is updated as it occurs for every test and some tests are not prepared to handle
// unexpected output - see 8196739. Instead we only check if the table is up-to-date
// if the check_globals flag is true, and in addition allow a grace period and only
// check for stale flags when we hit build 25 (which is far enough into the 6 month
// release cycle that all flag updates should have been processed, whilst still
// leaving time to make the change before RDP2).
// We use a gtest to call this, passing true, so that we can detect stale flags before
// the end of the release cycle.
static const int SPECIAL_FLAG_VALIDATION_BUILD = 25;
bool Arguments::verify_special_jvm_flags(bool check_globals) {
bool success = true;
for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) {
const SpecialFlag& flag = special_jvm_flags[i];
if (lookup_special_flag(flag.name, i)) {
warning("Duplicate special flag declaration \"%s\"", flag.name);
success = false;
}
if (flag.deprecated_in.is_undefined() &&
flag.obsolete_in.is_undefined()) {
warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name);
success = false;
}
if (!flag.deprecated_in.is_undefined()) {
if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) {
warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name);
success = false;
}
if (!version_less_than(flag.deprecated_in, flag.expired_in)) {
warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name);
success = false;
}
}
if (!flag.obsolete_in.is_undefined()) {
if (!version_less_than(flag.obsolete_in, flag.expired_in)) {
warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name);
success = false;
}
// if flag has become obsolete it should not have a "globals" flag defined anymore.
if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
!version_less_than(JDK_Version::current(), flag.obsolete_in)) {
if (JVMFlag::find_declared_flag(flag.name) != NULL) {
warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name);
success = false;
}
}
} else if (!flag.expired_in.is_undefined()) {
warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name);
success = false;
}
if (!flag.expired_in.is_undefined()) {
// if flag has become expired it should not have a "globals" flag defined anymore.
if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD &&
!version_less_than(JDK_Version::current(), flag.expired_in)) {
if (JVMFlag::find_declared_flag(flag.name) != NULL) {
warning("Global variable for expired flag entry \"%s\" should be removed", flag.name);
success = false;
}
}
}
}
return success;
}
#endif
bool Arguments::atojulong(const char *s, julong* result) {
return parse_integer(s, result);
}
Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) {
if (size < min_size) return arg_too_small;
if (size > max_size) return arg_too_big;
return arg_in_range;
}
// Describe an argument out of range error
void Arguments::describe_range_error(ArgsRange errcode) {
switch(errcode) {
case arg_too_big:
jio_fprintf(defaultStream::error_stream(),
"The specified size exceeds the maximum "
"representable size.\n");
break;
case arg_too_small:
case arg_unreadable:
case arg_in_range:
// do nothing for now
break;
default:
ShouldNotReachHere();
}
}
static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) {
if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) {
return true;
} else {
return false;
}
}
static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
// strtod allows leading whitespace, but our flag format does not.
if (*value == '\0' || isspace(*value)) {
return false;
}
char* end;
errno = 0;
double v = strtod(value, &end);
if ((errno != 0) || (*end != 0)) {
return false;
}
if (g_isnan(v) || !g_isfinite(v)) {
// Currently we cannot handle these special values.
return false;
}
if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) {
return true;
}
return false;
}
static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
JVMFlag::Error result = JVMFlag::WRONG_FORMAT;
if (flag->is_int()) {
int v;
if (parse_integer(value, &v)) {
result = JVMFlagAccess::set_int(flag, &v, origin);
}
} else if (flag->is_uint()) {
uint v;
if (parse_integer(value, &v)) {
result = JVMFlagAccess::set_uint(flag, &v, origin);
}
} else if (flag->is_intx()) {
intx v;
if (parse_integer(value, &v)) {
result = JVMFlagAccess::set_intx(flag, &v, origin);
}
} else if (flag->is_uintx()) {
uintx v;
if (parse_integer(value, &v)) {
result = JVMFlagAccess::set_uintx(flag, &v, origin);
}
} else if (flag->is_uint64_t()) {
uint64_t v;
if (parse_integer(value, &v)) {
result = JVMFlagAccess::set_uint64_t(flag, &v, origin);
}
} else if (flag->is_size_t()) {
size_t v;
if (parse_integer(value, &v)) {
result = JVMFlagAccess::set_size_t(flag, &v, origin);
}
}
return result == JVMFlag::SUCCESS;
}
static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) {
if (value[0] == '\0') {
value = NULL;
}
if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false;
// Contract: JVMFlag always returns a pointer that needs freeing.
FREE_C_HEAP_ARRAY(char, value);
return true;
}
static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) {
const char* old_value = "";
if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false;
size_t old_len = old_value != NULL ? strlen(old_value) : 0;
size_t new_len = strlen(new_value);
const char* value;
char* free_this_too = NULL;
if (old_len == 0) {
value = new_value;
} else if (new_len == 0) {
value = old_value;
} else {
size_t length = old_len + 1 + new_len + 1;
char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments);
// each new setting adds another LINE to the switch:
jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
value = buf;
free_this_too = buf;
}
(void) JVMFlagAccess::set_ccstr(flag, &value, origin);
// JVMFlag always returns a pointer that needs freeing.
FREE_C_HEAP_ARRAY(char, value);
// JVMFlag made its own copy, so I must delete my own temp. buffer.
FREE_C_HEAP_ARRAY(char, free_this_too);
return true;
}
const char* Arguments::handle_aliases_and_deprecation(const char* arg) {
const char* real_name = real_flag_name(arg);
JDK_Version since = JDK_Version();
switch (is_deprecated_flag(arg, &since)) {
case -1: {
// Obsolete or expired, so don't process normally,
// but allow for an obsolete flag we're still
// temporarily allowing.
if (!is_obsolete_flag(arg, &since)) {
return real_name;
}
// Note if we're not considered obsolete then we can't be expired either
// as obsoletion must come first.
return NULL;
}
case 0:
return real_name;
case 1: {
char version[256];
since.to_string(version, sizeof(version));
if (real_name != arg) {
warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
arg, version, real_name);
} else {
warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
arg, version);
}
return real_name;
}
}
ShouldNotReachHere();
return NULL;
}
#define BUFLEN 255
JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) {
char name_copied[BUFLEN+1];
if (name[name_length] != 0) {
if (name_length > BUFLEN) {
return NULL;
} else {
strncpy(name_copied, name, name_length);
name_copied[name_length] = '\0';
name = name_copied;
}
}
const char* real_name = Arguments::handle_aliases_and_deprecation(name);
if (real_name == NULL) {
return NULL;
}
JVMFlag* flag = JVMFlag::find_flag(real_name);
return flag;
}
bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) {
bool is_bool = false;
bool bool_val = false;
char c = *arg;
if (c == '+' || c == '-') {
is_bool = true;
bool_val = (c == '+');
arg++;
}
const char* name = arg;
while (true) {
c = *arg;
if (isalnum(c) || (c == '_')) {
++arg;
} else {
break;
}
}
size_t name_len = size_t(arg - name);
if (name_len == 0) {
return false;
}
JVMFlag* flag = find_jvm_flag(name, name_len);
if (flag == NULL) {
return false;
}
if (is_bool) {
if (*arg != 0) {
// Error -- extra characters such as -XX:+BoolFlag=123
return false;
}
return set_bool_flag(flag, bool_val, origin);
}
if (arg[0] == '=') {
const char* value = arg + 1;
if (flag->is_ccstr()) {
if (flag->ccstr_accumulates()) {
return append_to_string_flag(flag, value, origin);
} else {
return set_string_flag(flag, value, origin);
}
} else if (flag->is_double()) {
return set_fp_numeric_flag(flag, value, origin);
} else {
return set_numeric_flag(flag, value, origin);
}
}
if (arg[0] == ':' && arg[1] == '=') {
// -XX:Foo:=xxx will reset the string flag to the given value.
const char* value = arg + 2;
return set_string_flag(flag, value, origin);
}
return false;
}
void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
assert(bldarray != NULL, "illegal argument");
if (arg == NULL) {
return;
}
int new_count = *count + 1;
// expand the array and add arg to the last element
if (*bldarray == NULL) {
*bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments);
} else {
*bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments);
}
(*bldarray)[*count] = os::strdup_check_oom(arg);
*count = new_count;
}
void Arguments::build_jvm_args(const char* arg) {
add_string(&_jvm_args_array, &_num_jvm_args, arg);
}
void Arguments::build_jvm_flags(const char* arg) {
add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
}
// utility function to return a string that concatenates all
// strings in a given char** array
const char* Arguments::build_resource_string(char** args, int count) {
if (args == NULL || count == 0) {
return NULL;
}
size_t length = 0;
for (int i = 0; i < count; i++) {
length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
}
char* s = NEW_RESOURCE_ARRAY(char, length);
char* dst = s;
for (int j = 0; j < count; j++) {
size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
dst += offset;
length -= offset;
}
return (const char*) s;
}
void Arguments::print_on(outputStream* st) {
st->print_cr("VM Arguments:");
if (num_jvm_flags() > 0) {
st->print("jvm_flags: "); print_jvm_flags_on(st);
st->cr();
}
if (num_jvm_args() > 0) {
st->print("jvm_args: "); print_jvm_args_on(st);
st->cr();
}
st->print_cr("java_command: %s", java_command() ? java_command() : "");
if (_java_class_path != NULL) {
char* path = _java_class_path->value();
size_t len = strlen(path);
st->print("java_class_path (initial): ");
// Avoid using st->print_cr() because path length maybe longer than O_BUFLEN.
if (len == 0) {
st->print_raw_cr("");
} else {
st->print_raw_cr(path, len);
}
}
st->print_cr("Launcher Type: %s", _sun_java_launcher);
}
void Arguments::print_summary_on(outputStream* st) {
// Print the command line. Environment variables that are helpful for
// reproducing the problem are written later in the hs_err file.
// flags are from setting file
if (num_jvm_flags() > 0) {
st->print_raw("Settings File: ");
print_jvm_flags_on(st);
st->cr();
}
// args are the command line and environment variable arguments.
st->print_raw("Command Line: ");
if (num_jvm_args() > 0) {
print_jvm_args_on(st);
}
// this is the classfile and any arguments to the java program
if (java_command() != NULL) {
st->print("%s", java_command());
}
st->cr();
}
void Arguments::print_jvm_flags_on(outputStream* st) {
if (_num_jvm_flags > 0) {
for (int i=0; i < _num_jvm_flags; i++) {
st->print("%s ", _jvm_flags_array[i]);
}
}
}
void Arguments::print_jvm_args_on(outputStream* st) {
if (_num_jvm_args > 0) {
for (int i=0; i < _num_jvm_args; i++) {
st->print("%s ", _jvm_args_array[i]);
}
}
}
bool Arguments::process_argument(const char* arg,
jboolean ignore_unrecognized,
JVMFlagOrigin origin) {
JDK_Version since = JDK_Version();
if (parse_argument(arg, origin)) {
return true;
}
// Determine if the flag has '+', '-', or '=' characters.
bool has_plus_minus = (*arg == '+' || *arg == '-');
const char* const argname = has_plus_minus ? arg + 1 : arg;
size_t arg_len;
const char* equal_sign = strchr(argname, '=');
if (equal_sign == NULL) {
arg_len = strlen(argname);
} else {
arg_len = equal_sign - argname;
}
// Only make the obsolete check for valid arguments.
if (arg_len <= BUFLEN) {
// Construct a string which consists only of the argument name without '+', '-', or '='.
char stripped_argname[BUFLEN+1]; // +1 for '\0'
jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0'
if (is_obsolete_flag(stripped_argname, &since)) {
char version[256];
since.to_string(version, sizeof(version));
warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
return true;
}
}
// For locked flags, report a custom error message if available.
// Otherwise, report the standard unrecognized VM option.
const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len);
if (found_flag != NULL) {
char locked_message_buf[BUFLEN];
JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN);
if (strlen(locked_message_buf) == 0) {
if (found_flag->is_bool() && !has_plus_minus) {
jio_fprintf(defaultStream::error_stream(),
"Missing +/- setting for VM option '%s'\n", argname);
} else if (!found_flag->is_bool() && has_plus_minus) {
jio_fprintf(defaultStream::error_stream(),
"Unexpected +/- setting in VM option '%s'\n", argname);
} else {
jio_fprintf(defaultStream::error_stream(),
"Improperly specified VM option '%s'\n", argname);
}
} else {
#ifdef PRODUCT
bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) ||
(msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD));
if (ignore_unrecognized && mismatched) {
return true;
}
#endif
jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
}
} else {
if (ignore_unrecognized) {
return true;
}
jio_fprintf(defaultStream::error_stream(),
"Unrecognized VM option '%s'\n", argname);
JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true);
if (fuzzy_matched != NULL) {
jio_fprintf(defaultStream::error_stream(),
"Did you mean '%s%s%s'? ",
(fuzzy_matched->is_bool()) ? "(+/-)" : "",
fuzzy_matched->name(),
(fuzzy_matched->is_bool()) ? "" : "=");
}
}
// allow for commandline "commenting out" options like -XX:#+Verbose
return arg[0] == '#';
}
bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
FILE* stream = os::fopen(file_name, "rb");
if (stream == NULL) {
if (should_exist) {
jio_fprintf(defaultStream::error_stream(),
"Could not open settings file %s\n", file_name);
return false;
} else {
return true;
}
}
char token[1024];
int pos = 0;
bool in_white_space = true;
bool in_comment = false;
bool in_quote = false;
char quote_c = 0;
bool result = true;
int c = getc(stream);
while(c != EOF && pos < (int)(sizeof(token)-1)) {
if (in_white_space) {
if (in_comment) {
if (c == '\n') in_comment = false;
} else {
if (c == '#') in_comment = true;
else if (!isspace(c)) {
in_white_space = false;
token[pos++] = c;
}
}
} else {
if (c == '\n' || (!in_quote && isspace(c))) {
// token ends at newline, or at unquoted whitespace
// this allows a way to include spaces in string-valued options
token[pos] = '\0';
logOption(token);
result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
build_jvm_flags(token);
pos = 0;
in_white_space = true;
in_quote = false;
} else if (!in_quote && (c == '\'' || c == '"')) {
in_quote = true;
quote_c = c;
} else if (in_quote && (c == quote_c)) {
in_quote = false;
} else {
token[pos++] = c;
}
}
c = getc(stream);
}
if (pos > 0) {
token[pos] = '\0';
result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE);
build_jvm_flags(token);
}
fclose(stream);
return result;
}
//=============================================================================================================
// Parsing of properties (-D)
const char* Arguments::get_property(const char* key) {
return PropertyList_get_value(system_properties(), key);
}
bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) {
const char* eq = strchr(prop, '=');
const char* key;
const char* value = "";
if (eq == NULL) {
// property doesn't have a value, thus use passed string
key = prop;
} else {
// property have a value, thus extract it and save to the
// allocated string
size_t key_len = eq - prop;
char* tmp_key = AllocateHeap(key_len + 1, mtArguments);
jio_snprintf(tmp_key, key_len + 1, "%s", prop);
key = tmp_key;
value = &prop[key_len + 1];
}
#if INCLUDE_CDS
if (is_internal_module_property(key) ||
strcmp(key, "jdk.module.main") == 0) {
MetaspaceShared::disable_optimized_module_handling();
log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value);
}
if (strcmp(key, "jdk.module.showModuleResolution") == 0 ||
strcmp(key, "jdk.module.validation") == 0 ||
strcmp(key, "java.system.class.loader") == 0) {
MetaspaceShared::disable_full_module_graph();
log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value);
}
#endif
if (strcmp(key, "java.compiler") == 0) {
process_java_compiler_argument(value);
// Record value in Arguments, but let it get passed to Java.
} else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) {
// sun.java.launcher.is_altjvm property is
// private and is processed in process_sun_java_launcher_properties();
// the sun.java.launcher property is passed on to the java application
} else if (strcmp(key, "sun.boot.library.path") == 0) {
// append is true, writable is true, internal is false
PropertyList_unique_add(&_system_properties, key, value, AppendProperty,
WriteableProperty, ExternalProperty);
} else {
if (strcmp(key, "sun.java.command") == 0) {
char *old_java_command = _java_command;
_java_command = os::strdup_check_oom(value, mtArguments);
if (old_java_command != NULL) {
os::free(old_java_command);
}
} else if (strcmp(key, "java.vendor.url.bug") == 0) {
// If this property is set on the command line then its value will be
// displayed in VM error logs as the URL at which to submit such logs.
// Normally the URL displayed in error logs is different from the value
// of this system property, so a different property should have been
// used here, but we leave this as-is in case someone depends upon it.
const char* old_java_vendor_url_bug = _java_vendor_url_bug;
// save it in _java_vendor_url_bug, so JVM fatal error handler can access
// its value without going through the property list or making a Java call.
_java_vendor_url_bug = os::strdup_check_oom(value, mtArguments);
if (old_java_vendor_url_bug != NULL) {
os::free((void *)old_java_vendor_url_bug);
}
}
// Create new property and add at the end of the list
PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal);
}
if (key != prop) {
// SystemProperty copy passed value, thus free previously allocated
// memory
FreeHeap((void *)key);
}
return true;
}
#if INCLUDE_CDS
const char* unsupported_properties[] = { "jdk.module.limitmods",
"jdk.module.upgrade.path",
"jdk.module.patch.0" };
const char* unsupported_options[] = { "--limit-modules",
"--upgrade-module-path",
"--patch-module"
};
void Arguments::check_unsupported_dumping_properties() {
assert(is_dumping_archive(),
"this function is only used with CDS dump time");
assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
// If a vm option is found in the unsupported_options array, vm will exit with an error message.
SystemProperty* sp = system_properties();
while (sp != NULL) {
for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
if (strcmp(sp->key(), unsupported_properties[i]) == 0) {
vm_exit_during_initialization(
"Cannot use the following option when dumping the shared archive", unsupported_options[i]);
}
}
sp = sp->next();
}
// Check for an exploded module build in use with -Xshare:dump.
if (!has_jimage()) {
vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build");
}
}
bool Arguments::check_unsupported_cds_runtime_properties() {
assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}");
assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be");
if (ArchiveClassesAtExit != NULL) {
// dynamic dumping, just return false for now.
// check_unsupported_dumping_properties() will be called later to check the same set of
// properties, and will exit the VM with the correct error message if the unsupported properties
// are used.
return false;
}
for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) {
if (get_property(unsupported_properties[i]) != NULL) {
if (RequireSharedSpaces) {
warning("CDS is disabled when the %s option is specified.", unsupported_options[i]);
} else {
log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]);
}
return true;
}
}
return false;
}
#endif
//===========================================================================================================
// Setting int/mixed/comp mode flags
void Arguments::set_mode_flags(Mode mode) {
// Set up default values for all flags.
// If you add a flag to any of the branches below,
// add a default value for it here.
set_java_compiler(false);
_mode = mode;
// Ensure Agent_OnLoad has the correct initial values.
// This may not be the final mode; mode may change later in onload phase.
PropertyList_unique_add(&_system_properties, "java.vm.info",
VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty);
UseInterpreter = true;
UseCompiler = true;
UseLoopCounter = true;
// Default values may be platform/compiler dependent -
// use the saved values
ClipInlining = Arguments::_ClipInlining;
AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
UseOnStackReplacement = Arguments::_UseOnStackReplacement;
BackgroundCompilation = Arguments::_BackgroundCompilation;
// Change from defaults based on mode
switch (mode) {
default:
ShouldNotReachHere();
break;
case _int:
UseCompiler = false;
UseLoopCounter = false;
AlwaysCompileLoopMethods = false;
UseOnStackReplacement = false;
break;
case _mixed:
// same as default
break;
case _comp:
UseInterpreter = false;
BackgroundCompilation = false;
ClipInlining = false;
break;
}
}
// Conflict: required to use shared spaces (-Xshare:on), but
// incompatible command line options were chosen.
static void no_shared_spaces(const char* message) {
if (RequireSharedSpaces) {
jio_fprintf(defaultStream::error_stream(),
"Class data sharing is inconsistent with other specified options.\n");
vm_exit_during_initialization("Unable to use shared archive", message);
} else {
log_info(cds)("Unable to use shared archive: %s", message);
UseSharedSpaces = false;
}
}
void set_object_alignment() {
// Object alignment.
assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
MinObjAlignmentInBytes = ObjectAlignmentInBytes;
assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
// Oop encoding heap max
OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
}
size_t Arguments::max_heap_for_compressed_oops() {
// Avoid sign flip.
assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
// We need to fit both the NULL page and the heap into the memory budget, while
// keeping alignment constraints of the heap. To guarantee the latter, as the
// NULL page is located before the heap, we pad the NULL page to the conservative
// maximum alignment that the GC may ever impose upon the heap.
size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(),
_conservative_max_heap_alignment);
LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
NOT_LP64(ShouldNotReachHere(); return 0);
}
void Arguments::set_use_compressed_oops() {
#ifdef _LP64
// MaxHeapSize is not set up properly at this point, but
// the only value that can override MaxHeapSize if we are
// to use UseCompressedOops are InitialHeapSize and MinHeapSize.
size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize);
if (max_heap_size <= max_heap_for_compressed_oops()) {
if (FLAG_IS_DEFAULT(UseCompressedOops)) {
FLAG_SET_ERGO(UseCompressedOops, true);
}
} else {
if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
warning("Max heap size too large for Compressed Oops");
FLAG_SET_DEFAULT(UseCompressedOops, false);
if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) {
FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
}
}
}
#endif // _LP64
}
// NOTE: set_use_compressed_klass_ptrs() must be called after calling
// set_use_compressed_oops().
void Arguments::set_use_compressed_klass_ptrs() {
#ifdef _LP64
// On some architectures, the use of UseCompressedClassPointers implies the use of
// UseCompressedOops. The reason is that the rheap_base register of said platforms
// is reused to perform some optimized spilling, in order to use rheap_base as a
// temp register. But by treating it as any other temp register, spilling can typically
// be completely avoided instead. So it is better not to perform this trick. And by
// not having that reliance, large heaps, or heaps not supporting compressed oops,
// can still use compressed class pointers.
if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS && !UseCompressedOops) {
if (UseCompressedClassPointers) {
warning("UseCompressedClassPointers requires UseCompressedOops");
}
FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
} else {
// Turn on UseCompressedClassPointers too
if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
FLAG_SET_ERGO(UseCompressedClassPointers, true);
}
// Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
if (UseCompressedClassPointers) {
if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
}
}
}
#endif // _LP64
}
void Arguments::set_conservative_max_heap_alignment() {
// The conservative maximum required alignment for the heap is the maximum of
// the alignments imposed by several sources: any requirements from the heap
// itself and the maximum page size we may run the VM with.
size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment();
_conservative_max_heap_alignment = MAX4(heap_alignment,
(size_t)os::vm_allocation_granularity(),
os::max_page_size(),
GCArguments::compute_heap_alignment());
}
jint Arguments::set_ergonomics_flags() {
GCConfig::initialize();
set_conservative_max_heap_alignment();
#ifdef _LP64
set_use_compressed_oops();
// set_use_compressed_klass_ptrs() must be called after calling
// set_use_compressed_oops().
set_use_compressed_klass_ptrs();
// Also checks that certain machines are slower with compressed oops
// in vm_version initialization code.
#endif // _LP64
return JNI_OK;
}
size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) {
size_t max_allocatable;
size_t result = limit;
if (os::has_allocatable_memory_limit(&max_allocatable)) {
// The AggressiveHeap check is a temporary workaround to avoid calling
// GCarguments::heap_virtual_to_physical_ratio() before a GC has been
// selected. This works because AggressiveHeap implies UseParallelGC
// where we know the ratio will be 1. Once the AggressiveHeap option is
// removed, this can be cleaned up.
size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio());
size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio;
result = MIN2(result, max_allocatable / fraction);
}
return result;
}
// Use static initialization to get the default before parsing
static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
void Arguments::set_heap_size() {
julong phys_mem;
// If the user specified one of these options, they
// want specific memory sizing so do not limit memory
// based on compressed oops addressability.
// Also, memory limits will be calculated based on
// available os physical memory, not our MaxRAM limit,
// unless MaxRAM is also specified.
bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) ||
!FLAG_IS_DEFAULT(MaxRAMFraction) ||
!FLAG_IS_DEFAULT(MinRAMPercentage) ||
!FLAG_IS_DEFAULT(MinRAMFraction) ||
!FLAG_IS_DEFAULT(InitialRAMPercentage) ||
!FLAG_IS_DEFAULT(InitialRAMFraction) ||
!FLAG_IS_DEFAULT(MaxRAM));
if (override_coop_limit) {
if (FLAG_IS_DEFAULT(MaxRAM)) {
phys_mem = os::physical_memory();
FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem);
} else {
phys_mem = (julong)MaxRAM;
}
} else {
phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
: (julong)MaxRAM;
}
// Convert deprecated flags
if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
!FLAG_IS_DEFAULT(MaxRAMFraction))
MaxRAMPercentage = 100.0 / MaxRAMFraction;
if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
!FLAG_IS_DEFAULT(MinRAMFraction))
MinRAMPercentage = 100.0 / MinRAMFraction;
if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
!FLAG_IS_DEFAULT(InitialRAMFraction))
InitialRAMPercentage = 100.0 / InitialRAMFraction;
// If the maximum heap size has not been set with -Xmx,
// then set it as fraction of the size of physical memory,
// respecting the maximum and minimum sizes of the heap.
if (FLAG_IS_DEFAULT(MaxHeapSize)) {
julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
if (reasonable_min < MaxHeapSize) {
// Small physical memory, so use a minimum fraction of it for the heap
reasonable_max = reasonable_min;
} else {
// Not-small physical memory, so require a heap at least
// as large as MaxHeapSize
reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
}
if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
// Limit the heap size to ErgoHeapSizeLimit
reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
}
reasonable_max = limit_heap_by_allocatable_memory(reasonable_max);
if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
// An initial heap size was specified on the command line,
// so be sure that the maximum size is consistent. Done
// after call to limit_heap_by_allocatable_memory because that
// method might reduce the allocation size.
reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
} else if (!FLAG_IS_DEFAULT(MinHeapSize)) {
reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize);
}
#ifdef _LP64
if (UseCompressedOops || UseCompressedClassPointers) {
// HeapBaseMinAddress can be greater than default but not less than.
if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
// matches compressed oops printing flags
log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT
" (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT,
DefaultHeapBaseMinAddress,
DefaultHeapBaseMinAddress/G,
HeapBaseMinAddress);
FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress);
}
}
}
if (UseCompressedOops) {
// Limit the heap size to the maximum possible when using compressed oops
julong max_coop_heap = (julong)max_heap_for_compressed_oops();
if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
// Heap should be above HeapBaseMinAddress to get zero based compressed oops
// but it should be not less than default MaxHeapSize.
--> --------------------
--> maximum size reached
--> --------------------
¤ Dauer der Verarbeitung: 0.56 Sekunden
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