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Quellcode-Bibliothek© Kompilation durch diese Firma[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]Datei: bug52335.jsp Sprache: C |
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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 i 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_pat _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_ACCES 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 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), fal PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level( // 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, // 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.hp * -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 accept * 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 equa * 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 * - 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. // "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 // 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 "global // 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_Versio { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::und { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::und { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version: { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefin { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::und { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undef { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::un { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefi { "EnableWaitForParallelLoad", JDK_Version::jdk(20), JDK_Version::jdk(21), JDK_Versi // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expir { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Versio { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Versio { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefine // -------------- Obsolete Flags - sorted by expired_in -------------- { "ExtendedDTraceProbes", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version::j { "UseContainerCpuShares", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version:: { "PreferContainerQuotaForCPUCount", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK { "AliasLevel", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version::jdk(21) }, { "UseCodeAging", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(2 { "PrintSharedDictionary", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Versi { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_V { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_ { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Ver { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), J { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::j #ifdef ASSERT { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Versi #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(), { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefine { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefine #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 % 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 obsole 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.na 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 remove success = false; } } } else if (!flag.expired_in.is_undefined()) { warning("Special flag entry \"%s\" must be explicitly obsoleted before expired." 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.n 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, julon 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 or 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 arg, version, real_name); } else { warning("Option %s was deprecated in version %s and will likely be removed in a 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 char 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, jboole 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, PropertyIn 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: } 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", } #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 // 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_op } } 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 } } 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 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 propertie // 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_opt } 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 pow MinObjAlignmentInBytes = ObjectAlignmentInBytes; assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBy MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBy 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()->hea 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: 0.99 Sekunden (vorverarbeitet) ¤ |
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