| products/Sources/formale Sprachen/Java/Openjdk/test/jdk/tools/jpackage/linux/ (Sun/Oracle ©) Datei vom 13.11.2022 mit Größe 2 kB |
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Impressum arguments.cppSprache: 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(), JDK { "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.", f 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.na success = false; } } } else if (!flag.expired_in.is_undefined()) { warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.nam 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, 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 future release. 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 chara 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() : "<unknown>"); 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("<not set>"); } 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()) ? "" : "=<value>"); } } // 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: %s=%s", } 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, valu } #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_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 explod } } 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_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 o 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. max_coop_heap -= HeapBaseMinAddress; } // If user specified flags prioritizing os physical // memory limits, then disable compressed oops if // limits exceed max_coop_heap and UseCompressedOops // was not specified. if (reasonable_max > max_coop_heap) { if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " "Please check the setting of MaxRAMPercentage %5.2f." ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); FLAG_SET_ERGO(UseCompressedOops, false); if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) { FLAG_SET_ERGO(UseCompressedClassPointers, false); } } else { reasonable_max = MIN2(reasonable_max, max_coop_heap); } } } #endif // _LP64 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); } // If the minimum or initial heap_size have not been set or requested to be set // ergonomically, set them accordingly. if (InitialHeapSize == 0 || MinHeapSize == 0) { julong reasonable_minimum = (julong)(OldSize + NewSize); reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum); if (InitialHeapSize == 0) { julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial); reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSiz reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); } // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), // synchronize with InitialHeapSize to avoid errors with the default value. if (MinHeapSize == 0) { FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); } } } // This option inspects the machine and attempts to set various // parameters to be optimal for long-running, memory allocation // intensive jobs. It is intended for machines with large // amounts of cpu and memory. jint Arguments::set_aggressive_heap_flags() { // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit // VM, but we may not be able to represent the total physical memory // available (like having 8gb of memory on a box but using a 32bit VM). // Thus, we need to make sure we're using a julong for intermediate // calculations. julong initHeapSize; julong total_memory = os::physical_memory(); if (total_memory < (julong) 256 * M) { jio_fprintf(defaultStream::error_stream(), "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); vm_exit(1); } // The heap size is half of available memory, or (at most) // all of possible memory less 160mb (leaving room for the OS // when using ISM). This is the maximum; because adaptive sizing // is turned on below, the actual space used may be smaller. initHeapSize = MIN2(total_memory / (julong) 2, total_memory - (julong) 160 * M); initHeapSize = limit_heap_by_allocatable_memory(initHeapSize); if (FLAG_IS_DEFAULT(MaxHeapSize)) { if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } if (FLAG_IS_DEFAULT(NewSize)) { // Make the young generation 3/8ths of the total heap. if (FLAG_SET_CMDLINE(NewSize, ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and FLAG_SET_DEFAULT(UseLargePages, true); #endif // Increase some data structure sizes for efficiency if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { return JNI_EINVAL; } // See the OldPLABSize comment below, but replace 'after promotion' // with 'after copying'. YoungPLABSize is the size of the survivor // space per-gc-thread buffers. The default is 4kw. if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words return JNI_EINVAL; } // OldPLABSize is the size of the buffers in the old gen that // UseParallelGC uses to promote live data that doesn't fit in the // survivor spaces. At any given time, there's one for each gc thread. // The default size is 1kw. These buffers are rarely used, since the // survivor spaces are usually big enough. For specjbb, however, there // are occasions when there's lots of live data in the young gen // and we end up promoting some of it. We don't have a definite // explanation for why bumping OldPLABSize helps, but the theory // is that a bigger PLAB results in retaining something like the // original allocation order after promotion, which improves mutator // locality. A minor effect may be that larger PLABs reduce the // number of PLAB allocation events during gc. The value of 8kw // was arrived at by experimenting with specjbb. if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words return JNI_EINVAL; } // Enable parallel GC and adaptive generation sizing if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } // Encourage steady state memory management if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { return JNI_EINVAL; } // This appears to improve mutator locality if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } return JNI_OK; } // This must be called after ergonomics. void Arguments::set_bytecode_flags() { if (!RewriteBytecodes) { FLAG_SET_DEFAULT(RewriteFrequentPairs, false); } } // Aggressive optimization flags jint Arguments::set_aggressive_opts_flags() { #ifdef COMPILER2 if (AggressiveUnboxing) { if (FLAG_IS_DEFAULT(EliminateAutoBox)) { FLAG_SET_DEFAULT(EliminateAutoBox, true); } else if (!EliminateAutoBox) { // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); AggressiveUnboxing = false; } if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { FLAG_SET_DEFAULT(DoEscapeAnalysis, true); } else if (!DoEscapeAnalysis) { // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); AggressiveUnboxing = false; } } if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { if (FLAG_IS_DEFAULT(EliminateAutoBox)) { FLAG_SET_DEFAULT(EliminateAutoBox, true); } // Feed the cache size setting into the JDK char buffer[1024]; jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoB if (!add_property(buffer)) { return JNI_ENOMEM; } } #endif return JNI_OK; } //============================================================================== // Parsing of java.compiler property void Arguments::process_java_compiler_argument(const char* arg) { // For backwards compatibility, Djava.compiler=NONE or "" // causes us to switch to -Xint mode UNLESS -Xdebug // is also specified. if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. } } void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info _sun_java_launcher = os::strdup_check_oom(launcher); } bool Arguments::created_by_java_launcher() { assert(_sun_java_launcher != NULL, "property must have value"); return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; } bool Arguments::sun_java_launcher_is_altjvm() { return _sun_java_launcher_is_altjvm; } //============================================================================== // Parsing of main arguments unsigned int addreads_count = 0; unsigned int addexports_count = 0; unsigned int addopens_count = 0; unsigned int addmods_count = 0; unsigned int patch_mod_count = 0; unsigned int enable_native_access_count = 0; // Check the consistency of vm_init_args bool Arguments::check_vm_args_consistency() { // Method for adding checks for flag consistency. // The intent is to warn the user of all possible conflicts, // before returning an error. // Note: Needs platform-dependent factoring. bool status = true; if (TLABRefillWasteFraction == 0) { jio_fprintf(defaultStream::error_stream(), "TLABRefillWasteFraction should be a denominator, " "not " SIZE_FORMAT "\n", TLABRefillWasteFraction); status = false; } status = CompilerConfig::check_args_consistency(status); #if INCLUDE_JVMCI if (status && EnableJVMCI) { PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", AddProperty, UnwriteableProperty, InternalProperty); if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) { if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", ad return false; } } } #endif #if INCLUDE_JFR if (status && (FlightRecorderOptions || StartFlightRecording)) { if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count return false; } } #endif #ifndef SUPPORT_RESERVED_STACK_AREA if (StackReservedPages != 0) { FLAG_SET_CMDLINE(StackReservedPages, 0); warning("Reserved Stack Area not supported on this platform"); } #endif #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) if (UseHeavyMonitors) { jio_fprintf(defaultStream::error_stream(), "UseHeavyMonitors is not fully implemented on this architecture"); return false; } #endif #if (defined(X86) || defined(PPC64)) && !defined(ZERO) if (UseHeavyMonitors && UseRTMForStackLocks) { jio_fprintf(defaultStream::error_stream(), "-XX:+UseHeavyMonitors and -XX:+UseRTMForStackLocks are mutually exclusive"); return false; } #endif if (VerifyHeavyMonitors && !UseHeavyMonitors) { jio_fprintf(defaultStream::error_stream(), "-XX:+VerifyHeavyMonitors requires -XX:+UseHeavyMonitors"); return false; } return status; } bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, const char* option_type) { if (ignore) return false; const char* spacer = " "; if (option_type == NULL) { option_type = ++spacer; // Set both to the empty string. } jio_fprintf(defaultStream::error_stream(), "Unrecognized %s%soption: %s\n", option_type, spacer, option->optionString); return true; } static const char* user_assertion_options[] = { "-da", "-ea", "-disableassertions", "-enableassertions", 0 }; static const char* system_assertion_options[] = { "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 }; bool Arguments::parse_uintx(const char* value, uintx* uintx_arg, uintx min_size) { uintx n; if (!parse_integer(value, &n)) { return false; } if (n >= min_size) { *uintx_arg = n; return true; } else { return false; } } bool Arguments::create_module_property(const char* prop_name, const char* prop_value, P assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_ size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; char* property = AllocateHeap(prop_len, mtArguments); int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); if (ret < 0 || ret >= (int)prop_len) { FreeHeap(property); return false; } // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that // is enforced by checking is_internal_module_property(). We need the property to be writeab // that multiple occurrences of the associated flag just causes the existing property value to // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only con // to a property after we have finished flag processing. bool added = add_property(property, WriteableProperty, internal); FreeHeap(property); return added; } bool Arguments::create_numbered_module_property(const char* prop_base_name, const cha assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", const unsigned int props_count_limit = 1000; const int max_digits = 3; const int extra_symbols_count = 3; // includes '.', '=', '\0' // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. if (count < props_count_limit) { size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbol char* property = AllocateHeap(prop_len, mtArguments); int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value if (ret < 0 || ret >= (int)prop_len) { FreeHeap(property); jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", pro return false; } bool added = add_property(property, UnwriteableProperty, InternalProperty); FreeHeap(property); return added; } jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=% return false; } Arguments::ArgsRange Arguments::parse_memory_size(const char* s, julong* long_arg, julong min_size, julong max_size) { if (!parse_integer(s, long_arg)) return arg_unreadable; return check_memory_size(*long_arg, min_size, max_size); } // Parse JavaVMInitArgs structure jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args, const JavaVMInitArgs *java_tool_options_args, const JavaVMInitArgs *java_options_args, const JavaVMInitArgs *cmd_line_args) { bool patch_mod_javabase = false; // Save default settings for some mode flags Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; Arguments::_UseOnStackReplacement = UseOnStackReplacement; Arguments::_ClipInlining = ClipInlining; Arguments::_BackgroundCompilation = BackgroundCompilation; // Remember the default value of SharedBaseAddress. Arguments::_default_SharedBaseAddress = SharedBaseAddress; // Setup flags for mixed which is the default set_mode_flags(_mixed); // Parse args structure generated from java.base vm options resource jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RES if (result != JNI_OK) { return result; } // Parse args structure generated from JAVA_TOOL_OPTIONS environment // variable (if present). result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON if (result != JNI_OK) { return result; } // Parse args structure generated from the command line flags. result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE); if (result != JNI_OK) { return result; } // Parse args structure generated from the _JAVA_OPTIONS environment // variable (if present) (mimics classic VM) result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR) if (result != JNI_OK) { return result; } // We need to ensure processor and memory resources have been properly // configured - which may rely on arguments we just processed - before // doing the final argument processing. Any argument processing that // needs to know about processor and memory resources must occur after // this point. os::init_container_support(); // Do final processing now that all arguments have been parsed result = finalize_vm_init_args(patch_mod_javabase); if (result != JNI_OK) { return result; } return JNI_OK; } // Checks if name in command-line argument -agent{lib,path}:name[=options] // represents a valid JDWP agent. is_path==true denotes that we // are dealing with -agentpath (case where name is a path), otherwise with // -agentlib bool valid_jdwp_agent(char *name, bool is_path) { char *_name; const char *_jdwp = "jdwp"; size_t _len_jdwp, _len_prefix; if (is_path) { if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { return false; } _name++; // skip past last path separator _len_prefix = strlen(JNI_LIB_PREFIX); if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { return false; } _name += _len_prefix; _len_jdwp = strlen(_jdwp); if (strncmp(_name, _jdwp, _len_jdwp) == 0) { _name += _len_jdwp; } else { return false; } if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { return false; } return true; } if (strcmp(name, _jdwp) == 0) { return true; } return false; } int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_j // --patch-module=<module>=<file>(<pathsep><file>)* assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); // Find the equal sign between the module name and the path specification const char* module_equal = strchr(patch_mod_tail, '='); if (module_equal == NULL) { jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specificat return JNI_ERR; } else { // Pick out the module name size_t module_len = module_equal - patch_mod_tail; char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); if (module_name != NULL) { memcpy(module_name, patch_mod_tail, module_len); *(module_name + module_len) = '\0'; // The path piece begins one past the module_equal sign add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); FREE_C_HEAP_ARRAY(char, module_name); if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_ return JNI_ENOMEM; } } else { return JNI_ENOMEM; } } return JNI_OK; } // Parse -Xss memory string parameter and convert to ThreadStackSize in K. jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_Thread // The min and max sizes match the values in globals.hpp, but scaled // with K. The values have been chosen so that alignment with page // size doesn't change the max value, which makes the conversions // back and forth between Xss value and ThreadStackSize value easier. // The values have also been chosen to fit inside a 32-bit signed type. const julong min_ThreadStackSize = 0; const julong max_ThreadStackSize = 1 * M; // Make sure the above values match the range set in globals.hpp const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(Thr assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be"); assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be"); const julong min_size = min_ThreadStackSize * K; const julong max_size = max_ThreadStackSize * K; assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); julong size = 0; ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); if (errcode != arg_in_range) { bool silent = (option == NULL); // Allow testing to silence error messages if (!silent) { jio_fprintf(defaultStream::error_stream(), "Invalid thread stack size: %s\n", option->optionString); describe_range_error(errcode); } return JNI_EINVAL; } // Internally track ThreadStackSize in units of 1024 bytes. const julong size_aligned = align_up(size, K); assert(size <= size_aligned, "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, size, size_aligned); const julong size_in_K = size_aligned / K; assert(size_in_K < (julong)max_intx, "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, size_in_K); // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); assert(max_expanded < max_uintx && max_expanded >= size_in_K, "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, max_expanded, size_in_K); *out_ThreadStackSize = (intx)size_in_K; return JNI_OK; } jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_ja // For match_option to return remaining or value part of option string const char* tail; // iterate over arguments for (int index = 0; index < args->nOptions; index++) { bool is_absolute_path = false; // for -agentpath vs -agentlib const JavaVMOption* option = args->options + index; if (!match_option(option, "-Djava.class.path", &tail) && !match_option(option, "-Dsun.java.command", &tail) && !match_option(option, "-Dsun.java.launcher", &tail)) { // add all jvm options to the jvm_args string. This string // is used later to set the java.vm.args PerfData string constant. // the -Djava.class.path and the -Dsun.java.command options are // omitted from jvm_args string as each have their own PerfData // string constant object. build_jvm_args(option->optionString); } // -verbose:[class/module/gc/jni] if (match_option(option, "-verbose", &tail)) { if (!strcmp(tail, ":class") || !strcmp(tail, "")) { LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); } else if (!strcmp(tail, ":module")) { LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); } else if (!strcmp(tail, ":gc")) { if (_legacyGCLogging.lastFlag == 0) { _legacyGCLogging.lastFlag = 1; } } else if (!strcmp(tail, ":jni")) { LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); } // -da / -ea / -disableassertions / -enableassertions // These accept an optional class/package name separated by a colon, e.g., // -da:java.lang.Thread. } else if (match_option(option, user_assertion_options, &tail, true)) { bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' if (*tail == '\0') { JavaAssertions::setUserClassDefault(enable); } else { assert(*tail == ':', "bogus match by match_option()"); JavaAssertions::addOption(tail + 1, enable); } // -dsa / -esa / -disablesystemassertions / -enablesystemassertions } else if (match_option(option, system_assertion_options, &tail, false)) { bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' JavaAssertions::setSystemClassDefault(enable); // -bootclasspath: } else if (match_option(option, "-Xbootclasspath:", &tail)) { jio_fprintf(defaultStream::output_stream(), "-Xbootclasspath is no longer a supported option.\n"); return JNI_EINVAL; // -bootclasspath/a: } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { Arguments::append_sysclasspath(tail); #if INCLUDE_CDS MetaspaceShared::disable_optimized_module_handling(); log_info(cds)("optimized module handling: disabled because bootclasspath was appended") #endif // -bootclasspath/p: } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { jio_fprintf(defaultStream::output_stream(), "-Xbootclasspath/p is no longer a supported option.\n"); return JNI_EINVAL; // -Xrun } else if (match_option(option, "-Xrun", &tail)) { if (tail != NULL) { const char* pos = strchr(tail, ':'); size_t len = (pos == NULL) ? strlen(tail) : pos - tail; char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); jio_snprintf(name, len + 1, "%s", tail); char *options = NULL; if(pos != NULL) { size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); } #if !INCLUDE_JVMTI if (strcmp(name, "jdwp") == 0) { jio_fprintf(defaultStream::error_stream(), "Debugging agents are not supported in this VM\n"); return JNI_ERR; } #endif // !INCLUDE_JVMTI add_init_library(name, options); } } else if (match_option(option, "--add-reads=", &tail)) { if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++) return JNI_ENOMEM; } } else if (match_option(option, "--add-exports=", &tail)) { if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_coun return JNI_ENOMEM; } } else if (match_option(option, "--add-opens=", &tail)) { if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++) return JNI_ENOMEM; } } else if (match_option(option, "--add-modules=", &tail)) { if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) { return JNI_ENOMEM; } } else if (match_option(option, "--enable-native-access=", &tail)) { if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enabl return JNI_ENOMEM; } } else if (match_option(option, "--limit-modules=", &tail)) { if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { return JNI_ENOMEM; } } else if (match_option(option, "--module-path=", &tail)) { if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { return JNI_ENOMEM; } } else if (match_option(option, "--upgrade-module-path=", &tail)) { if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { return JNI_ENOMEM; } } else if (match_option(option, "--patch-module=", &tail)) { // --patch-module=<module>=<file>(<pathsep><file>)* int res = process_patch_mod_option(tail, patch_mod_javabase); if (res != JNI_OK) { return res; } } else if (match_option(option, "--illegal-access=", &tail)) { char version[256]; JDK_Version::jdk(17).to_string(version, sizeof(version)); warning("Ignoring option %s; support was removed in %s", option->optionString, version); // -agentlib and -agentpath } else if (match_option(option, "-agentlib:", &tail) || (is_absolute_path = match_option(option, "-agentpath:", &tail))) { if(tail != NULL) { const char* pos = strchr(tail, '='); char* name; if (pos == NULL) { name = os::strdup_check_oom(tail, mtArguments); } else { size_t len = pos - tail; name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); memcpy(name, tail, len); name[len] = '\0'; } char *options = NULL; if(pos != NULL) { options = os::strdup_check_oom(pos + 1, mtArguments); } #if !INCLUDE_JVMTI if (valid_jdwp_agent(name, is_absolute_path)) { jio_fprintf(defaultStream::error_stream(), "Debugging agents are not supported in this VM\n"); return JNI_ERR; } #endif // !INCLUDE_JVMTI add_init_agent(name, options, is_absolute_path); } // -javaagent } else if (match_option(option, "-javaagent:", &tail)) { #if !INCLUDE_JVMTI jio_fprintf(defaultStream::error_stream(), "Instrumentation agents are not supported in this VM\n"); return JNI_ERR; #else if (tail != NULL) { size_t length = strlen(tail) + 1; char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); jio_snprintf(options, length, "%s", tail); add_instrument_agent("instrument", options, false); // java agents need module java.instrument if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmo return JNI_ENOMEM; } } #endif // !INCLUDE_JVMTI // --enable_preview } else if (match_option(option, "--enable-preview")) { set_enable_preview(); // -Xnoclassgc } else if (match_option(option, "-Xnoclassgc")) { if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } // -Xbatch } else if (match_option(option, "-Xbatch")) { if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } // -Xmn for compatibility with other JVM vendors } else if (match_option(option, "-Xmn", &tail)) { julong long_initial_young_size = 0; ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); if (errcode != arg_in_range) { jio_fprintf(defaultStream::error_stream(), "Invalid initial young generation size: %s\n", option->optionString); describe_range_error(errcode); return JNI_EINVAL; } if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCES return JNI_EINVAL; } if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { return JNI_EINVAL; } // -Xms } else if (match_option(option, "-Xms", &tail)) { julong size = 0; // an initial heap size of 0 means automatically determine ArgsRange errcode = parse_memory_size(tail, &size, 0); if (errcode != arg_in_range) { jio_fprintf(defaultStream::error_stream(), "Invalid initial heap size: %s\n", option->optionString); describe_range_error(errcode); return JNI_EINVAL; } if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { return JNI_EINVAL; } // -Xmx } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=" julong long_max_heap_size = 0; ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); if (errcode != arg_in_range) { jio_fprintf(defaultStream::error_stream(), "Invalid maximum heap size: %s\n", option->optionString); describe_range_error(errcode); return JNI_EINVAL; } if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { return JNI_EINVAL; } // Xmaxf } else if (match_option(option, "-Xmaxf", &tail)) { char* err; int maxf = (int)(strtod(tail, &err) * 100); if (*err != '\0' || *tail == '\0') { jio_fprintf(defaultStream::error_stream(), "Bad max heap free percentage size: %s\n", option->optionString); return JNI_EINVAL; } else { if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } // Xminf } else if (match_option(option, "-Xminf", &tail)) { char* err; int minf = (int)(strtod(tail, &err) * 100); if (*err != '\0' || *tail == '\0') { jio_fprintf(defaultStream::error_stream(), "Bad min heap free percentage size: %s\n", option->optionString); return JNI_EINVAL; } else { if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } // -Xss } else if (match_option(option, "-Xss", &tail)) { intx value = 0; jint err = parse_xss(option, tail, &value); if (err != JNI_OK) { return err; } if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } else if (match_option(option, "-Xmaxjitcodesize", &tail) || match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { julong long_ReservedCodeCacheSize = 0; ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); if (errcode != arg_in_range) { jio_fprintf(defaultStream::error_stream(), "Invalid maximum code cache size: %s.\n", option->optionString); return JNI_EINVAL; } if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JV return JNI_EINVAL; } // -green } else if (match_option(option, "-green")) { jio_fprintf(defaultStream::error_stream(), "Green threads support not available\n"); return JNI_EINVAL; // -native } else if (match_option(option, "-native")) { // HotSpot always uses native threads, ignore silently for compatibility // -Xrs } else if (match_option(option, "-Xrs")) { // Classic/EVM option, new functionality if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } // -Xprof } else if (match_option(option, "-Xprof")) { char version[256]; // Obsolete in JDK 10 JDK_Version::jdk(10).to_string(version, sizeof(version)); warning("Ignoring option %s; support was removed in %s", option->optionString, version); // -Xinternalversion } else if (match_option(option, "-Xinternalversion")) { jio_fprintf(defaultStream::output_stream(), "%s\n", VM_Version::internal_vm_info_string()); vm_exit(0); #ifndef PRODUCT // -Xprintflags } else if (match_option(option, "-Xprintflags")) { JVMFlag::printFlags(tty, false); vm_exit(0); #endif // -D } else if (match_option(option, "-D", &tail)) { const char* value; if (match_option(option, "-Djava.endorsed.dirs=", &value) && *value!= '\0' && strcmp(value, "\"\"") != 0) { // abort if -Djava.endorsed.dirs is set jio_fprintf(defaultStream::output_stream(), "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" "in modular form will be supported via the concept of upgradeable modules.\n", value); return JNI_EINVAL; } if (match_option(option, "-Djava.ext.dirs=", &value) && *value != '\0' && strcmp(value, "\"\"") != 0) { // abort if -Djava.ext.dirs is set jio_fprintf(defaultStream::output_stream(), "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); return JNI_EINVAL; } // Check for module related properties. They must be set using the modules // options. For example: use "--add-modules=java.sql", not // "-Djdk.module.addmods=java.sql" if (is_internal_module_property(option->optionString + 2)) { needs_module_property_warning = true; continue; } if (!add_property(tail)) { return JNI_ENOMEM; } // Out of the box management support if (match_option(option, "-Dcom.sun.management", &tail)) { #if INCLUDE_MANAGEMENT if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } // management agent in module jdk.management.agent if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", return JNI_ENOMEM; } #else jio_fprintf(defaultStream::output_stream(), "-Dcom.sun.management is not supported in this VM.\n"); return JNI_ERR; #endif } // -Xint } else if (match_option(option, "-Xint")) { set_mode_flags(_int); // -Xmixed } else if (match_option(option, "-Xmixed")) { set_mode_flags(_mixed); // -Xcomp } else if (match_option(option, "-Xcomp")) { // for testing the compiler; turn off all flags that inhibit compilation set_mode_flags(_comp); // -Xshare:dump } else if (match_option(option, "-Xshare:dump")) { DumpSharedSpaces = true; // -Xshare:on } else if (match_option(option, "-Xshare:on")) { UseSharedSpaces = true; RequireSharedSpaces = true; // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> } else if (match_option(option, "-Xshare:auto")) { UseSharedSpaces = true; RequireSharedSpaces = false; xshare_auto_cmd_line = true; // -Xshare:off } else if (match_option(option, "-Xshare:off")) { UseSharedSpaces = false; RequireSharedSpaces = false; // -Xverify } else if (match_option(option, "-Xverify", &tail)) { if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } else if (strcmp(tail, ":remote") == 0) { if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } else if (strcmp(tail, ":none") == 0) { if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be rem } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { return JNI_EINVAL; } // -Xdebug } else if (match_option(option, "-Xdebug")) { // note this flag has been used, then ignore set_xdebug_mode(true); // -Xnoagent } else if (match_option(option, "-Xnoagent")) { // For compatibility with classic. HotSpot refuses to load the old style agent.dll. } else if (match_option(option, "-Xloggc:", &tail)) { // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); _legacyGCLogging.lastFlag = 2; _legacyGCLogging.file = os::strdup_check_oom(tail); } else if (match_option(option, "-Xlog", &tail)) { bool ret = false; if (strcmp(tail, ":help") == 0) { fileStream stream(defaultStream::output_stream()); LogConfiguration::print_command_line_help(&stream); vm_exit(0); } else if (strcmp(tail, ":disable") == 0) { LogConfiguration::disable_logging(); ret = true; } else if (strcmp(tail, ":async") == 0) { LogConfiguration::set_async_mode(true); ret = true; } else if (*tail == '\0') { ret = LogConfiguration::parse_command_line_arguments(); assert(ret, "-Xlog without arguments should never fail to parse"); } else if (*tail == ':') { ret = LogConfiguration::parse_command_line_arguments(tail + 1); } if (ret == false) { jio_fprintf(defaultStream::error_stream(), "Invalid -Xlog option '-Xlog%s', see error log for details.\n", tail); return JNI_EINVAL; } // JNI hooks } else if (match_option(option, "-Xcheck", &tail)) { if (!strcmp(tail, ":jni")) { #if !INCLUDE_JNI_CHECK warning("JNI CHECKING is not supported in this VM"); #else CheckJNICalls = true; #endif // INCLUDE_JNI_CHECK } else if (is_bad_option(option, args->ignoreUnrecognized, "check")) { return JNI_EINVAL; } } else if (match_option(option, "vfprintf")) { _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); } else if (match_option(option, "exit")) { _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); } else if (match_option(option, "abort")) { _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; // and the last option wins. } else if (match_option(option, "-XX:+NeverTenure")) { if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) return JNI_EINVAL; } } else if (match_option(option, "-XX:+AlwaysTenure")) { if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { uintx max_tenuring_thresh = 0; if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { jio_fprintf(defaultStream::error_stream(), "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); return JNI_EINVAL; } if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) return JNI_EINVAL; } if (MaxTenuringThreshold == 0) { if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } else { if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } else if (match_option(option, "-XX:+ErrorFileToStderr")) { if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } else if (match_option(option, "-XX:+ErrorFileToStdout")) { if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } } else if (match_option(option, "--finalization=", &tail)) { if (strcmp(tail, "enabled") == 0) { InstanceKlass::set_finalization_enabled(true); } else if (strcmp(tail, "disabled") == 0) { InstanceKlass::set_finalization_enabled(false); } else { jio_fprintf(defaultStream::error_stream(), "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n", tail); return JNI_EINVAL; } #if !defined(DTRACE_ENABLED) } else if (match_option(option, "-XX:+DTraceMethodProbes")) { jio_fprintf(defaultStream::error_stream(), "DTraceMethodProbes flag is not applicable for this configuration\n"); return JNI_EINVAL; } else if (match_option(option, "-XX:+DTraceAllocProbes")) { jio_fprintf(defaultStream::error_stream(), "DTraceAllocProbes flag is not applicable for this configuration\n"); return JNI_EINVAL; } else if (match_option(option, "-XX:+DTraceMonitorProbes")) { jio_fprintf(defaultStream::error_stream(), "DTraceMonitorProbes flag is not applicable for this configuration\n"); return JNI_EINVAL; #endif // !defined(DTRACE_ENABLED) #ifdef ASSERT } else if (match_option(option, "-XX:+FullGCALot")) { if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { return JNI_EINVAL; } // disable scavenge before parallel mark-compact if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { return JNI_EINVAL; } #endif #if !INCLUDE_MANAGEMENT } else if (match_option(option, "-XX:+ManagementServer")) { jio_fprintf(defaultStream::error_stream(), "ManagementServer is not supported in this VM.\n"); return JNI_ERR; #endif // INCLUDE_MANAGEMENT #if INCLUDE_JVMCI } else if (match_option(option, "-XX:-EnableJVMCIProduct")) { if (EnableJVMCIProduct) { jio_fprintf(defaultStream::error_stream(), "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n"); return JNI_EINVAL; } } else if (match_option(option, "-XX:+EnableJVMCIProduct")) { // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before if (EnableJVMCIProduct) { continue; } JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); // Allow this flag if it has been unlocked. if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) { if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) { jio_fprintf(defaultStream::error_stream(), "Unable to enable JVMCI in product mode"); return JNI_ERR; } } // The flag was locked so process normally to report that error else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { return JNI_EINVAL; } #endif // INCLUDE_JVMCI #if INCLUDE_JFR } else if (match_jfr_option(&option)) { return JNI_EINVAL; #endif } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have // already been handled if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { if (!process_argument(tail, args->ignoreUnrecognized, origin)) { return JNI_EINVAL; } } // Unknown option } else if (is_bad_option(option, args->ignoreUnrecognized)) { return JNI_ERR; } } // PrintSharedArchiveAndExit will turn on // -Xshare:on // -Xlog:class+path=info if (PrintSharedArchiveAndExit) { UseSharedSpaces = true; RequireSharedSpaces = true; LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); } fix_appclasspath(); return JNI_OK; } void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* pa // For java.base check for duplicate --patch-module options being specified on the command li // This check is only required for java.base, all other duplicate module specifications // will be checked during module system initialization. The module system initialization // will throw an ExceptionInInitializerError if this situation occurs. if (strcmp(module_name, JAVA_BASE_NAME) == 0) { if (*patch_mod_javabase) { vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patc } else { *patch_mod_javabase = true; } } // Create GrowableArray lazily, only if --patch-module has been specified if (_patch_mod_prefix == NULL) { _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); } _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); } // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) // // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar. // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.j // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empt // path is treated as the current directory. // // This causes problems with CDS, which requires that all directories specified in the classpa // must be empty. In most cases, applications do NOT want to load classes from the current // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' star // scripts compatible with CDS. void Arguments::fix_appclasspath() { if (IgnoreEmptyClassPaths) { const char separator = *os::path_separator(); const char* src = _java_class_path->value(); // skip over all the leading empty paths while (*src == separator) { src ++; } char* copy = os::strdup_check_oom(src, mtArguments); // trim all trailing empty paths for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { *tail = '\0'; } char from[3] = {separator, separator, '\0'}; char to [2] = {separator, '\0'}; while (StringUtils::replace_no_expand(copy, from, to) > 0) { // Keep replacing "::" -> ":" until we have no more "::" (non-windows) // Keep replacing ";;" -> ";" until we have no more ";;" (windows) } _java_class_path->set_writeable_value(copy); FreeHeap(copy); // a copy was made by set_value, so don't need this anymore } } jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { // check if the default lib/endorsed directory exists; if so, error char path[JVM_MAXPATHLEN]; const char* fileSep = os::file_separator(); jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), DIR* dir = os::opendir(path); if (dir != NULL) { jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" "in modular form will be supported via the concept of upgradeable modules.\n"); os::closedir(dir); return JNI_ERR; } jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileS dir = os::opendir(path); if (dir != NULL) { jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " "Use -classpath instead.\n."); os::closedir(dir); return JNI_ERR; } // This must be done after all arguments have been processed // and the container support has been initialized since AggressiveHeap // relies on the amount of total memory available. if (AggressiveHeap) { jint result = set_aggressive_heap_flags(); if (result != JNI_OK) { return result; } } // This must be done after all arguments have been processed. // java_compiler() true means set to "NONE" or empty. if (java_compiler() && !xdebug_mode()) { // For backwards compatibility, we switch to interpreted mode if // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was // not specified. set_mode_flags(_int); } // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter // but like -Xint, leave compilation thresholds unaffected. // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as w if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { set_mode_flags(_int); } #ifdef ZERO // Zero always runs in interpreted mode set_mode_flags(_int); #endif // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuring FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); } #if !COMPILER2_OR_JVMCI // Don't degrade server performance for footprint if (FLAG_IS_DEFAULT(UseLargePages) && MaxHeapSize < LargePageHeapSizeThreshold) { // No need for large granularity pages w/small heaps. // Note that large pages are enabled/disabled for both the // Java heap and the code cache. FLAG_SET_DEFAULT(UseLargePages, false); } UNSUPPORTED_OPTION(ProfileInterpreter); #endif // Parse the CompilationMode flag if (!CompilationModeFlag::initialize()) { return JNI_ERR; } if (!check_vm_args_consistency()) { return JNI_ERR; } #if INCLUDE_CDS if (DumpSharedSpaces) { // Compiler threads may concurrently update the class metadata (such as method entries), so it // unsafe with -Xshare:dump (which modifies the class metadata in place). Let's disable // compiler just to be safe. // // Note: this is not a concern for dynamically dumping shared spaces, which makes a copy of the // class metadata instead of modifying them in place. The copy is inaccessible to the compiler. // TODO: revisit the following for the static archive case. set_mode_flags(_int); } // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit if (ArchiveClassesAtExit != NULL && RecordDynamicDumpInfo) { jio_fprintf(defaultStream::output_stream(), "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n"); return JNI_ERR; } if (ArchiveClassesAtExit == NULL && !RecordDynamicDumpInfo) { DynamicDumpSharedSpaces = false; } else { DynamicDumpSharedSpaces = true; } if (AutoCreateSharedArchive) { if (SharedArchiveFile == NULL) { log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile"); return JNI_ERR; } if (ArchiveClassesAtExit != NULL) { log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExi return JNI_ERR; } } if (UseSharedSpaces && patch_mod_javabase) { no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); } if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { UseSharedSpaces = false; } if (DumpSharedSpaces || DynamicDumpSharedSpaces) { // Always verify non-system classes during CDS dump if (!BytecodeVerificationRemote) { BytecodeVerificationRemote = true; log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump t } } #endif #ifndef CAN_SHOW_REGISTERS_ON_ASSERT UNSUPPORTED_OPTION(ShowRegistersOnAssert); #endif // CAN_SHOW_REGISTERS_ON_ASSERT return JNI_OK; } // Helper class for controlling the lifetime of JavaVMInitArgs // objects. The contents of the JavaVMInitArgs are guaranteed to be // deleted on the destruction of the ScopedVMInitArgs object. class ScopedVMInitArgs : public StackObj { private: JavaVMInitArgs _args; char* _container_name; bool _is_set; char* _vm_options_file_arg; public: ScopedVMInitArgs(const char *container_name) { _args.version = JNI_VERSION_1_2; _args.nOptions = 0; _args.options = NULL; _args.ignoreUnrecognized = false; _container_name = (char *)container_name; _is_set = false; _vm_options_file_arg = NULL; } // Populates the JavaVMInitArgs object represented by this // ScopedVMInitArgs object with the arguments in options. The // allocated memory is deleted by the destructor. If this method // returns anything other than JNI_OK, then this object is in a // partially constructed state, and should be abandoned. jint set_args(const GrowableArrayView<JavaVMOption>* options) { _is_set = true; JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( JavaVMOption, options->length(), mtArguments); if (options_arr == NULL) { return JNI_ENOMEM; } _args.options = options_arr; for (int i = 0; i < options->length(); i++) { options_arr[i] = options->at(i); options_arr[i].optionString = os::strdup(options_arr[i].optionString); if (options_arr[i].optionString == NULL) { // Rely on the destructor to do cleanup. _args.nOptions = i; return JNI_ENOMEM; } } _args.nOptions = options->length(); _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; return JNI_OK; } JavaVMInitArgs* get() { return &_args; } char* container_name() { return _container_name; } bool is_set() { return _is_set; } bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } char* vm_options_file_arg() { return _vm_options_file_arg; } void set_vm_options_file_arg(const char *vm_options_file_arg) { if (_vm_options_file_arg != NULL) { os::free(_vm_options_file_arg); } _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); } ~ScopedVMInitArgs() { if (_vm_options_file_arg != NULL) { os::free(_vm_options_file_arg); } if (_args.options == NULL) return; for (int i = 0; i < _args.nOptions; i++) { os::free(_args.options[i].optionString); } FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); } // Insert options into this option list, to replace option at // vm_options_file_pos (-XX:VMOptionsFile) jint insert(const JavaVMInitArgs* args, const JavaVMInitArgs* args_to_insert, const int vm_options_file_pos) { assert(_args.options == NULL, "shouldn't be set yet"); assert(args_to_insert->nOptions != 0, "there should be args to insert"); assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); int length = args->nOptions + args_to_insert->nOptions - 1; // Construct new option array GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); for (int i = 0; i < args->nOptions; i++) { if (i == vm_options_file_pos) { // insert the new options starting at the same place as the // -XX:VMOptionsFile option for (int j = 0; j < args_to_insert->nOptions; j++) { options.push(args_to_insert->options[j]); } } else { options.push(args->options[i]); } } // make into options array return set_args(&options); } }; jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { return parse_options_environment_variable("_JAVA_OPTIONS", args); } jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* arg return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); } jint Arguments::parse_options_environment_variable(const char* name, ScopedVMInitArgs* vm_args) { char *buffer = ::getenv(name); // Don't check this environment variable if user has special privileges // (e.g. unix su command). if (buffer == NULL || os::have_special_privileges()) { return JNI_OK; } if ((buffer = os::strdup(buffer)) == NULL) { return JNI_ENOMEM; } jio_fprintf(defaultStream::error_stream(), "Picked up %s: %s\n", name, buffer); int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); os::free(buffer); return retcode; } jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_arg // read file into buffer int fd = ::open(file_name, O_RDONLY); if (fd < 0) { jio_fprintf(defaultStream::error_stream(), "Could not open options file '%s'\n", file_name); return JNI_ERR; } struct stat stbuf; int retcode = os::stat(file_name, &stbuf); if (retcode != 0) { jio_fprintf(defaultStream::error_stream(), "Could not stat options file '%s'\n", file_name); ::close(fd); return JNI_ERR; } if (stbuf.st_size == 0) { // tell caller there is no option data and that is ok ::close(fd); return JNI_OK; } // '+ 1' for NULL termination even with max bytes size_t bytes_alloc = stbuf.st_size + 1; char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); if (NULL == buf) { jio_fprintf(defaultStream::error_stream(), "Could not allocate read buffer for options file parse\n"); ::close(fd); return JNI_ENOMEM; } memset(buf, 0, bytes_alloc); // Fill buffer ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); ::close(fd); if (bytes_read < 0) { FREE_C_HEAP_ARRAY(char, buf); jio_fprintf(defaultStream::error_stream(), "Could not read options file '%s'\n", file_name); return JNI_ERR; } if (bytes_read == 0) { // tell caller there is no option data and that is ok FREE_C_HEAP_ARRAY(char, buf); return JNI_OK; } retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); FREE_C_HEAP_ARRAY(char, buf); return retcode; } jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_le // Construct option array GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); // some pointers to help with parsing char *buffer_end = buffer + buf_len; char *opt_hd = buffer; char *wrt = buffer; char *rd = buffer; // parse all options while (rd < buffer_end) { // skip leading white space from the input string while (rd < buffer_end && isspace(*rd)) { rd++; } if (rd >= buffer_end) { break; } // Remember this is where we found the head of the token. opt_hd = wrt; // Tokens are strings of non white space characters separated // by one or more white spaces. while (rd < buffer_end && !isspace(*rd)) { if (*rd == '\'' || *rd == '"') { // handle a quoted string int quote = *rd; // matching quote to look for rd++; // don't copy open quote while (rd < buffer_end && *rd != quote) { // include everything (even spaces) // up until the close quote *wrt++ = *rd++; // copy to option string } if (rd < buffer_end) { rd++; // don't copy close quote } else { // did not see closing quote jio_fprintf(defaultStream::error_stream(), "Unmatched quote in %s\n", name); return JNI_ERR; } } else { *wrt++ = *rd++; // copy to option string } } // steal a white space character and set it to NULL *wrt++ = '\0'; // We now have a complete token JavaVMOption option; option.optionString = opt_hd; option.extraInfo = NULL; options.append(option); // Fill in option rd++; // Advance to next character } // Fill out JavaVMInitArgs structure. return vm_args->set_args(&options); } void Arguments::set_shared_spaces_flags_and_archive_paths() { if (DumpSharedSpaces) { if (RequireSharedSpaces) { warning("Cannot dump shared archive while using shared archive"); } UseSharedSpaces = false; } #if INCLUDE_CDS // Initialize shared archive paths which could include both base and dynamic archive paths // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properl // // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid. if (DumpSharedSpaces || UseSharedSpaces) { init_shared_archive_paths(); } #endif // INCLUDE_CDS } #if INCLUDE_CDS // Sharing support // Construct the path to the archive char* Arguments::get_default_shared_archive_path() { char *default_archive_path; char jvm_path[JVM_MAXPATHLEN]; os::jvm_path(jvm_path, sizeof(jvm_path)); char *end = strrchr(jvm_path, *os::file_separator()); if (end != NULL) *end = '\0'; size_t jvm_path_len = strlen(jvm_path); size_t file_sep_len = strlen(os::file_separator()); const size_t len = jvm_path_len + file_sep_len + 20; default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); jio_snprintf(default_archive_path, len, LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa", jvm_path, os::file_separator()); return default_archive_path; } int Arguments::num_archives(const char* archive_path) { if (archive_path == NULL) { return 0; } int npaths = 1; char* p = (char*)archive_path; while (*p != '\0') { if (*p == os::path_separator()[0]) { npaths++; } p++; } return npaths; } void Arguments::extract_shared_archive_paths(const char* archive_path, char** base_archive_path, char** top_archive_path) { char* begin_ptr = (char*)archive_path; char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]); if (end_ptr == NULL || end_ptr == begin_ptr) { vm_exit_during_initialization("Base archive was not specified", archive_path); } size_t len = end_ptr - begin_ptr; char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); strncpy(cur_path, begin_ptr, len); cur_path[len] = '\0'; *base_archive_path = cur_path; begin_ptr = ++end_ptr; if (*begin_ptr == '\0') { vm_exit_during_initialization("Top archive was not specified", archive_path); } end_ptr = strchr(begin_ptr, '\0'); assert(end_ptr != NULL, "sanity"); len = end_ptr - begin_ptr; cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); strncpy(cur_path, begin_ptr, len + 1); *top_archive_path = cur_path; } void Arguments::init_shared_archive_paths() { if (ArchiveClassesAtExit != nullptr) { assert(!RecordDynamicDumpInfo, "already checked"); if (DumpSharedSpaces) { vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:d } check_unsupported_dumping_properties(); if (os::same_files((const char*)get_default_shared_archive_path(), ArchiveClassesAt vm_exit_during_initialization( "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_share } } if (SharedArchiveFile == nullptr) { SharedArchivePath = get_default_shared_archive_path(); } else { int archives = num_archives(SharedArchiveFile); assert(archives > 0, "must be"); if (is_dumping_archive() && archives > 1) { vm_exit_during_initialization( "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping" } if (DumpSharedSpaces) { assert(archives == 1, "must be"); // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file // will be overwritten no matter regardless of its contents SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments); } else { // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa // is read from top.jsa // (a) 1 file: -XX:SharedArchiveFile=base.jsa // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa // (c) 2 files: -XX:SharedArchiveFile=top.jsa // // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not // allow cases (b) and (c). Case (b) is already checked above. if (archives > 2) { vm_exit_during_initialization( "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option"); } if (archives == 1) { char* base_archive_path = NULL; bool success = FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path); if (!success) { // If +AutoCreateSharedArchive and the specified shared archive does not exist, // regenerate the dynamic archive base on default archive. if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) { DynamicDumpSharedSpaces = true; ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile); SharedArchivePath = get_default_shared_archive_path(); SharedArchiveFile = nullptr; } else { if (AutoCreateSharedArchive) { warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. AutoCreateSharedArchive = false; } no_shared_spaces("invalid archive"); } } else if (base_archive_path == NULL) { // User has specified a single archive, which is a static archive. SharedArchivePath = const_cast<char *>(SharedArchiveFile); } else { // User has specified a single archive, which is a dynamic archive. SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile); SharedArchivePath = base_archive_path; // has been c-heap allocated. } } else { extract_shared_archive_paths((const char*)SharedArchiveFile, &SharedArchivePath, &SharedDynamicArchivePath); if (SharedArchivePath == NULL) { assert(SharedDynamicArchivePath == NULL, "must be"); no_shared_spaces("invalid archive"); } } if (SharedDynamicArchivePath != nullptr) { // Check for case (c) if (RecordDynamicDumpInfo) { vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynam SharedArchiveFile); } if (ArchiveClassesAtExit != nullptr) { vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic SharedArchiveFile); } } if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesA vm_exit_during_initialization( "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClas SharedArchiveFile); } } } } #endif // INCLUDE_CDS #ifndef PRODUCT // Determine whether LogVMOutput should be implicitly turned on. static bool use_vm_log() { if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || PrintAssembly || TraceDeoptimization || TraceDependencies || (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { return true; } #ifdef COMPILER1 if (PrintC1Statistics) { return true; } #endif // COMPILER1 #ifdef COMPILER2 if (PrintOptoAssembly || PrintOptoStatistics) { return true; } #endif // COMPILER2 return false; } #endif // PRODUCT bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { for (int index = 0; index < args->nOptions; index++) { const JavaVMOption* option = args->options + index; const char* tail; if (match_option(option, "-XX:VMOptionsFile=", &tail)) { return true; } } return false; } jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, const char* vm_options_file, const int vm_options_file_pos, ScopedVMInitArgs* vm_options_file_args, ScopedVMInitArgs* args_out) { jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); if (code != JNI_OK) { return code; } if (vm_options_file_args->get()->nOptions < 1) { return JNI_OK; } if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { jio_fprintf(defaultStream::error_stream(), "A VM options file may not refer to a VM options file. " "Specification of '-XX:VMOptionsFile=<file-name>' in the " "options file '%s' in options container '%s' is an error.\n", vm_options_file_args->vm_options_file_arg(), vm_options_file_args->container_name()); return JNI_EINVAL; } return args_out->insert(args, vm_options_file_args->get(), vm_options_file_pos); } // Expand -XX:VMOptionsFile found in args_in as needed. // mod_args and args_out parameters may return values as needed. jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, ScopedVMInitArgs* mod_args, JavaVMInitArgs** args_out) { jint code = match_special_option_and_act(args_in, mod_args); if (code != JNI_OK) { return code; } if (mod_args->is_set()) { // args_in contains -XX:VMOptionsFile and mod_args contains the // original options from args_in along with the options expanded // from the VMOptionsFile. Return a short-hand to the caller. *args_out = mod_args->get(); } else { *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in } return JNI_OK; } jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, ScopedVMInitArgs* args_out) { // Remaining part of option string const char* tail; ScopedVMInitArgs vm_options_file_args(args_out->container_name()); for (int index = 0; index < args->nOptions; index++) { const JavaVMOption* option = args->options + index; if (match_option(option, "-XX:Flags=", &tail)) { Arguments::set_jvm_flags_file(tail); continue; } if (match_option(option, "-XX:VMOptionsFile=", &tail)) { if (vm_options_file_args.found_vm_options_file_arg()) { jio_fprintf(defaultStream::error_stream(), "The option '%s' is already specified in the options " "container '%s' so the specification of '%s' in the " "same options container is an error.\n", vm_options_file_args.vm_options_file_arg(), vm_options_file_args.container_name(), option->optionString); return JNI_EINVAL; } vm_options_file_args.set_vm_options_file_arg(option->optionString); // If there's a VMOptionsFile, parse that jint code = insert_vm_options_file(args, tail, index, &vm_options_file_args, args_out); if (code != JNI_OK) { return code; } args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); if (args_out->is_set()) { // The VMOptions file inserted some options so switch 'args' // to the new set of options, and continue processing which // preserves "last option wins" semantics. args = args_out->get(); // The first option from the VMOptionsFile replaces the // current option. So we back track to process the // replacement option. index--; } continue; } if (match_option(option, "-XX:+PrintVMOptions")) { PrintVMOptions = true; continue; } if (match_option(option, "-XX:-PrintVMOptions")) { PrintVMOptions = false; continue; } if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { IgnoreUnrecognizedVMOptions = true; continue; } if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { IgnoreUnrecognizedVMOptions = false; continue; } if (match_option(option, "-XX:+PrintFlagsInitial")) { JVMFlag::printFlags(tty, false); vm_exit(0); } #ifndef PRODUCT if (match_option(option, "-XX:+PrintFlagsWithComments")) { JVMFlag::printFlags(tty, true); vm_exit(0); } #endif } return JNI_OK; } static void print_options(const JavaVMInitArgs *args) { const char* tail; for (int index = 0; index < args->nOptions; index++) { const JavaVMOption *option = args->options + index; if (match_option(option, "-XX:", &tail)) { logOption(tail); } } } bool Arguments::handle_deprecated_print_gc_flags() { if (PrintGC) { log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); } if (PrintGCDetails) { log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); } if (_legacyGCLogging.lastFlag == 2) { // -Xloggc was used to specify a filename const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; LogTarget(Error, logging) target; LogStream errstream(target); return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, NULL, N } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) { LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); } return true; } static void apply_debugger_ergo() { #ifndef PRODUCT // UseDebuggerErgo is notproduct if (ReplayCompiles) { FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true); } #endif #ifndef PRODUCT if (UseDebuggerErgo) { // Turn on sub-flags FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true); FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true); } #endif if (UseDebuggerErgo2) { // Debugging with limited number of CPUs FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false); FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1); FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1); FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2); } } // Parse entry point called from JNI_CreateJavaVM jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsiste JVMFlag::check_all_flag_declarations(); // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. const char* hotspotrc = ".hotspotrc"; bool settings_file_specified = false; bool needs_hotspotrc_warning = false; ScopedVMInitArgs initial_vm_options_args(""); ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); // Pointers to current working set of containers JavaVMInitArgs* cur_cmd_args; JavaVMInitArgs* cur_vm_options_args; JavaVMInitArgs* cur_java_options_args; JavaVMInitArgs* cur_java_tool_options_args; // Containers for modified/expanded options ScopedVMInitArgs mod_cmd_args("cmd_line_args"); ScopedVMInitArgs mod_vm_options_args("vm_options_args"); ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); jint code = parse_java_tool_options_environment_variable(&initial_java_tool_options_args); if (code != JNI_OK) { return code; } code = parse_java_options_environment_variable(&initial_java_options_args); if (code != JNI_OK) { return code; } // Parse the options in the /java.base/jdk/internal/vm/options resource, if present char *vmoptions = ClassLoader::lookup_vm_options(); if (vmoptions != NULL) { code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); FREE_C_HEAP_ARRAY(char, vmoptions); if (code != JNI_OK) { return code; } } code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), &mod_java_tool_options_args, &cur_java_tool_options_args); if (code != JNI_OK) { return code; } code = expand_vm_options_as_needed(initial_cmd_args, &mod_cmd_args, &cur_cmd_args); if (code != JNI_OK) { return code; } code = expand_vm_options_as_needed(initial_java_options_args.get(), &mod_java_options_args, &cur_java_options_args); if (code != JNI_OK) { return code; } code = expand_vm_options_as_needed(initial_vm_options_args.get(), &mod_vm_options_args, &cur_vm_options_args); if (code != JNI_OK) { return code; } const char* flags_file = Arguments::get_jvm_flags_file(); settings_file_specified = (flags_file != NULL); if (IgnoreUnrecognizedVMOptions) { cur_cmd_args->ignoreUnrecognized = true; cur_java_tool_options_args->ignoreUnrecognized = true; cur_java_options_args->ignoreUnrecognized = true; } // Parse specified settings file if (settings_file_specified) { if (!process_settings_file(flags_file, true, cur_cmd_args->ignoreUnrecognized)) { return JNI_EINVAL; } } else { #ifdef ASSERT // Parse default .hotspotrc settings file if (!process_settings_file(".hotspotrc", false, cur_cmd_args->ignoreUnrecognized)) { return JNI_EINVAL; } #else struct stat buf; if (os::stat(hotspotrc, &buf) == 0) { needs_hotspotrc_warning = true; } #endif } if (PrintVMOptions) { print_options(cur_java_tool_options_args); print_options(cur_cmd_args); print_options(cur_java_options_args); } // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS jint result = parse_vm_init_args(cur_vm_options_args, cur_java_tool_options_args, cur_java_options_args, cur_cmd_args); if (result != JNI_OK) { return result; } // Delay warning until here so that we've had a chance to process // the -XX:-PrintWarnings flag if (needs_hotspotrc_warning) { warning("%s file is present but has been ignored. " "Run with -XX:Flags=%s to load the file.", hotspotrc, hotspotrc); } if (needs_module_property_warning) { warning("Ignoring system property options whose names match the '-Djdk.module.*'." " names that are reserved for internal use."); } #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and UNSUPPORTED_OPTION(UseLargePages); #endif #if defined(AIX) UNSUPPORTED_OPTION_NULL(AllocateHeapAt); #endif #ifndef PRODUCT if (TraceBytecodesAt != 0) { TraceBytecodes = true; } if (CountCompiledCalls) { if (UseCounterDecay) { warning("UseCounterDecay disabled because CountCalls is set"); UseCounterDecay = false; } } #endif // PRODUCT if (ScavengeRootsInCode == 0) { if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { warning("Forcing ScavengeRootsInCode non-zero"); } ScavengeRootsInCode = 1; } if (!handle_deprecated_print_gc_flags()) { return JNI_EINVAL; } // Set object alignment values. set_object_alignment(); #if !INCLUDE_CDS if (DumpSharedSpaces || RequireSharedSpaces) { jio_fprintf(defaultStream::error_stream(), "Shared spaces are not supported in this VM\n"); return JNI_ERR; } if (DumpLoadedClassList != NULL) { jio_fprintf(defaultStream::error_stream(), "DumpLoadedClassList is not supported in this VM\n"); return JNI_ERR; } if ((UseSharedSpaces && xshare_auto_cmd_line) || log_is_enabled(Info, cds)) { warning("Shared spaces are not supported in this VM"); UseSharedSpaces = false; LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); } no_shared_spaces("CDS Disabled"); #endif // INCLUDE_CDS // Verify NMT arguments const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking); if (lvl == NMT_unknown) { jio_fprintf(defaultStream::error_stream(), "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); return JNI_ERR; } if (PrintNMTStatistics && lvl == NMT_off) { warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); FLAG_SET_DEFAULT(PrintNMTStatistics, false); } if (TraceDependencies && VerifyDependencies) { if (!FLAG_IS_DEFAULT(TraceDependencies)) { warning("TraceDependencies results may be inflated by VerifyDependencies"); } } apply_debugger_ergo(); if (log_is_enabled(Info, arguments)) { LogStream st(Log(arguments)::info()); Arguments::print_on(&st); } return JNI_OK; } jint Arguments::apply_ergo() { // Set flags based on ergonomics. jint result = set_ergonomics_flags(); if (result != JNI_OK) return result; // Set heap size based on available physical memory set_heap_size(); GCConfig::arguments()->initialize(); set_shared_spaces_flags_and_archive_paths(); // Initialize Metaspace flags and alignments Metaspace::ergo_initialize(); if (!StringDedup::ergo_initialize()) { return JNI_EINVAL; } // Set compiler flags after GC is selected and GC specific // flags (LoopStripMiningIter) are set. CompilerConfig::ergo_initialize(); // Set bytecode rewriting flags set_bytecode_flags(); // Set flags if aggressive optimization flags are enabled jint code = set_aggressive_opts_flags(); if (code != JNI_OK) { return code; } #ifdef ZERO // Clear flags not supported on zero. FLAG_SET_DEFAULT(ProfileInterpreter, false); #endif // ZERO if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional outpu DebugNonSafepoints = true; } if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers ar } // Treat the odd case where local verification is enabled but remote // verification is not as if both were enabled. if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { log_info(verification)("Turning on remote verification because local verification is on" FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); } #ifndef PRODUCT if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { if (use_vm_log()) { LogVMOutput = true; } } #endif // PRODUCT if (PrintCommandLineFlags) { JVMFlag::printSetFlags(tty); } #ifdef COMPILER2 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) { if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) { warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off."); } FLAG_SET_DEFAULT(EnableVectorReboxing, false); if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxin if (!EnableVectorReboxing) { warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turne } else { warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned } } FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false); if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) { warning("Disabling UseVectorStubs since EnableVectorSupport is turned off."); } FLAG_SET_DEFAULT(UseVectorStubs, false); } #endif // COMPILER2 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) { if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabl LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasse } } return JNI_OK; } jint Arguments::adjust_after_os() { if (UseNUMA) { if (UseParallelGC) { if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); } } } return JNI_OK; } int Arguments::PropertyList_count(SystemProperty* pl) { int count = 0; while(pl != NULL) { count++; pl = pl->next(); } return count; } // Return the number of readable properties. int Arguments::PropertyList_readable_count(SystemProperty* pl) { int count = 0; while(pl != NULL) { if (pl->readable()) { count++; } pl = pl->next(); } return count; } const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { assert(key != NULL, "just checking"); SystemProperty* prop; for (prop = pl; prop != NULL; prop = prop->next()) { if (strcmp(key, prop->key()) == 0) return prop->value(); } return NULL; } // Return the value of the requested property provided that it is a readable property. const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char assert(key != NULL, "just checking"); SystemProperty* prop; // Return the property value if the keys match and the property is not internal or // it's the special internal property "jdk.boot.class.path.append". for (prop = pl; prop != NULL; prop = prop->next()) { if (strcmp(key, prop->key()) == 0) { if (!prop->internal()) { return prop->value(); } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { return prop->value(); } else { // Property is internal and not jdk.boot.class.path.append so return NULL. return NULL; } } } return NULL; } void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { SystemProperty* p = *plist; if (p == NULL) { *plist = new_p; } else { while (p->next() != NULL) { p = p->next(); } p->set_next(new_p); } } void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, bool writeable, bool internal) { if (plist == NULL) return; SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); PropertyList_add(plist, new_p); } void Arguments::PropertyList_add(SystemProperty *element) { PropertyList_add(&_system_properties, element); } // This add maintains unique property key in the list. void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const ch PropertyAppendable append, PropertyWriteable writeable, PropertyInternal internal) { if (plist == NULL) return; // If property key exists and is writeable, then update with new value. // Trying to update a non-writeable property is silently ignored. SystemProperty* prop; for (prop = *plist; prop != NULL; prop = prop->next()) { if (strcmp(k, prop->key()) == 0) { if (append == AppendProperty) { prop->append_writeable_value(v); } else { prop->set_writeable_value(v); } return; } } PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProper } // Copies src into buf, replacing "%%" with "%" and "%p" with pid // Returns true if all of the source pointed by src has been copied over to // the destination buffer pointed by buf. Otherwise, returns false. // Notes: // 1. If the length (buflen) of the destination buffer excluding the // NULL terminator character is not long enough for holding the expanded // pid characters, it also returns false instead of returning the partially // expanded one. // 2. The passed in "buflen" should be large enough to hold the null terminator. bool Arguments::copy_expand_pid(const char* src, size_t srclen, char* buf, size_t buflen) { const char* p = src; char* b = buf; const char* src_end = &src[srclen]; char* buf_end = &buf[buflen - 1]; while (p < src_end && b < buf_end) { if (*p == '%') { switch (*(++p)) { case '%': // "%%" ==> "%" *b++ = *p++; break; case 'p': { // "%p" ==> current process id // buf_end points to the character before the last character so // that we could write '\0' to the end of the buffer. size_t buf_sz = buf_end - b + 1; int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); // if jio_snprintf fails or the buffer is not long enough to hold // the expanded pid, returns false. if (ret < 0 || ret >= (int)buf_sz) { return false; } else { b += ret; assert(*b == '\0', "fail in copy_expand_pid"); if (p == src_end && b == buf_end + 1) { // reach the end of the buffer. return true; } } p++; break; } default : *b++ = '%'; } } else { *b++ = *p++; } } *b = '\0'; return (p == src_end); // return false if not all of the source was copied } bool Arguments::parse_malloc_limit_size(const char* s, size_t* out) { julong limit = 0; Arguments::ArgsRange range = parse_memory_size(s, &limit, 1, SIZE_MAX); switch (range) { case ArgsRange::arg_in_range: *out = (size_t)limit; return true; case ArgsRange::arg_too_big: // only possible on 32-bit vm_exit_during_initialization("MallocLimit: too large", s); break; case ArgsRange::arg_too_small: vm_exit_during_initialization("MallocLimit: limit must be > 0"); break; default: break; } return false; } // Helper for parse_malloc_limits void Arguments::parse_single_category_limit(char* expression, size_t limits[mt_numbe // <category>:<limit> char* colon = ::strchr(expression, ':'); if (colon == nullptr) { vm_exit_during_initialization("MallocLimit: colon missing", expression); } *colon = '\0'; MEMFLAGS f = NMTUtil::string_to_flag(expression); if (f == mtNone) { vm_exit_during_initialization("MallocLimit: invalid nmt category", expression); } if (parse_malloc_limit_size(colon + 1, limits + (int)f) == false) { vm_exit_during_initialization("Invalid MallocLimit size", colon + 1); } } void Arguments::parse_malloc_limits(size_t* total_limit, size_t limits[mt_number_of_ // Reset output to 0 *total_limit = 0; for (int i = 0; i < mt_number_of_types; i ++) { limits[i] = 0; } // We are done if the option is not given. if (MallocLimit == nullptr) { return; } // Global form? if (parse_malloc_limit_size(MallocLimit, total_limit)) { return; } // No. So it must be in category-specific form: MallocLimit=<nmt category>:<size>[,<nmt category> char* copy = os::strdup(MallocLimit); if (copy == nullptr) { vm_exit_out_of_memory(strlen(MallocLimit), OOM_MALLOC_ERROR, "MallocLimit"); } char* p = copy, *q; do { q = p; p = ::strchr(q, ','); if (p != nullptr) { *p = '\0'; p ++; } parse_single_category_limit(q, limits); } while (p != nullptr); os::free(copy); }
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