/* * Copyright (c) 1997, 2025, 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. * */ #ifndef SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP #define SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP #include "memory/allStatic.hpp" // For declaration of class AllStatic #include "utilities/globalDefinitions.hpp" typedef enum { NoDetectedVirtualization, XenHVM, XenPVHVM, // mix-mode on Linux aarch64 KVM, VMWare, HyperV, HyperVRole, PowerVM, // on AIX or Linux ppc64(le) PowerFullPartitionMode, // on Linux ppc64(le) PowerKVM } VirtualizationType; class outputStream; enum class vmIntrinsicID; // Abstract_VM_Version provides information about the VM. class Abstract_VM_Version: AllStatic { friend class VMStructs; friend class JVMCIVMStructs; protected: static const char* _s_vm_release; static const char* _s_internal_vm_info_string; // CPU feature flags, can be affected by VM settings. static uint64_t _features; static const char* _features_string; static const char* _cpu_info_string; // Original CPU feature flags, not affected by VM settings. static uint64_t _cpu_features; // These are set by machine-dependent initializations #ifndef SUPPORTS_NATIVE_CX8 static bool _supports_cx8; #endif static bool _supports_atomic_getset4; static bool _supports_atomic_getset8; static bool _supports_atomic_getadd4; static bool _supports_atomic_getadd8; static unsigned int _logical_processors_per_package; static unsigned int _L1_data_cache_line_size; static int _vm_major_version; static int _vm_minor_version; static int _vm_security_version; static int _vm_patch_version; static int _vm_build_number; static unsigned int _data_cache_line_flush_size; public: static VirtualizationType _detected_virtualization; // Called as part of the runtime services initialization which is // called from the management module initialization (via init_globals()) // after argument parsing and attaching of the main thread has // occurred. Examines a variety of the hardware capabilities of // the platform to determine which features can be used to execute the // program. static void initialize() { } // This allows for early initialization of VM_Version information // that may be needed later in the initialization sequence but before // full VM_Version initialization is possible. It can not depend on any // other part of the VM being initialized when called. Platforms that // need to specialize this define VM_Version::early_initialize(). static void early_initialize() { } // Called to initialize VM variables needing initialization // after command line parsing. Platforms that need to specialize // this should define VM_Version::init_before_ergo(). static void init_before_ergo() {} // Name static const char* vm_name(); // Vendor static const char* vm_vendor(); // VM version information string printed by launcher (java -version) static const char* vm_info_string(); static const char* vm_release(); static const char* vm_platform_string(); static const char* vm_variant(); static int vm_major_version() { return _vm_major_version; } static int vm_minor_version() { return _vm_minor_version; } static int vm_security_version() { return _vm_security_version; } static int vm_patch_version() { return _vm_patch_version; } static int vm_build_number() { return _vm_build_number; } // Gets the jvm_version_info.jvm_version static unsigned int jvm_version(); // Internal version providing additional build information static const char* internal_vm_info_string(); static const char* jdk_debug_level(); static const char* printable_jdk_debug_level(); static const char* features_string() { return _features_string; } static const char* cpu_info_string() { return _cpu_info_string; } static const char* extract_features_string(const char* cpu_info_string, size_t cpu_info_string_len, size_t features_offset); static VirtualizationType get_detected_virtualization() { return _detected_virtualization; } // platforms that need to specialize this // define VM_Version::print_platform_virtualization_info() static void print_platform_virtualization_info(outputStream*) { } // does HW support an 8-byte compare-exchange operation? // Required to be true but still dynamically checked at runtime // for platforms that don't set SUPPORTS_NATIVE_CX8 static bool supports_cx8() { #ifdef SUPPORTS_NATIVE_CX8 return true; #else return _supports_cx8; #endif } // does HW support atomic get-and-set or atomic get-and-add? Used // to guide intrinsification decisions for Unsafe atomic ops static bool supports_atomic_getset4() {return _supports_atomic_getset4;} static bool supports_atomic_getset8() {return _supports_atomic_getset8;} static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;} static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;} static unsigned int logical_processors_per_package() { return _logical_processors_per_package; } static unsigned int L1_data_cache_line_size() { return _L1_data_cache_line_size; } // the size in bytes of a data cache line flushed by a flush // operation which should be a power of two or zero if cache line // writeback is not supported by the current os_cpu combination static unsigned int data_cache_line_flush_size() { return _data_cache_line_flush_size; } // returns true if and only if cache line writeback is supported static bool supports_data_cache_line_flush() { return _data_cache_line_flush_size != 0; } // Denominator for computing default ParallelGCThreads for machines with // a large number of cores. static uint parallel_worker_threads_denominator() { return 8; } // Does this CPU support spin wait instruction? static bool supports_on_spin_wait() { return false; } // Does platform support fast class initialization checks for static methods? static bool supports_fast_class_init_checks() { return false; } // Does platform support stack watermark barriers for concurrent stack processing? constexpr static bool supports_stack_watermark_barrier() { return false; } // Is recursive lightweight locking implemented for this platform? constexpr static bool supports_recursive_lightweight_locking() { return false; } // Does platform support secondary supers table lookup? constexpr static bool supports_secondary_supers_table() { return false; } // Does platform support float16 instructions? static bool supports_float16() { return false; } // Does this CPU support this intrinsic? static bool is_intrinsic_supported(vmIntrinsicID id) { return true; } static bool profile_all_receivers_at_type_check() { return true; } static bool print_matching_lines_from_file(const char* filename, outputStream* st, const char* keywords_to_match[]); protected: // VM_Version statics static const size_t CPU_TYPE_DESC_BUF_SIZE = 256; static const size_t CPU_DETAILED_DESC_BUF_SIZE = 4096; static int _no_of_threads; static int _no_of_cores; static int _no_of_sockets; static bool _initialized; static char _cpu_name[CPU_TYPE_DESC_BUF_SIZE]; static char _cpu_desc[CPU_DETAILED_DESC_BUF_SIZE]; public: static int number_of_threads(void); static int number_of_cores(void); static int number_of_sockets(void); static const char* cpu_name(void); static const char* cpu_description(void); }; #endif // SHARE_RUNTIME_ABSTRACT_VM_VERSION_HPP