167 lines
6.4 KiB
C++
167 lines
6.4 KiB
C++
/*
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* Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_RUNTIME_VM_VERSION_HPP
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#define SHARE_VM_RUNTIME_VM_VERSION_HPP
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#include "memory/allocation.hpp"
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#include "utilities/ostream.hpp"
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#include "utilities/macros.hpp"
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// VM_Version provides information about the VM.
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class Abstract_VM_Version: AllStatic {
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friend class VMStructs;
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friend class JVMCIVMStructs;
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protected:
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static const char* _s_vm_release;
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static const char* _s_internal_vm_info_string;
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// CPU feature flags.
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static uint64_t _features;
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static const char* _features_string;
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// These are set by machine-dependent initializations
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static bool _supports_cx8;
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static bool _supports_atomic_getset4;
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static bool _supports_atomic_getset8;
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static bool _supports_atomic_getadd4;
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static bool _supports_atomic_getadd8;
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static unsigned int _logical_processors_per_package;
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static unsigned int _L1_data_cache_line_size;
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static int _vm_major_version;
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static int _vm_minor_version;
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static int _vm_security_version;
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static int _vm_patch_version;
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static int _vm_build_number;
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static unsigned int _parallel_worker_threads;
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static bool _parallel_worker_threads_initialized;
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static unsigned int nof_parallel_worker_threads(unsigned int num,
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unsigned int dem,
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unsigned int switch_pt);
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public:
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// Called as part of the runtime services initialization which is
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// called from the management module initialization (via init_globals())
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// after argument parsing and attaching of the main thread has
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// occurred. Examines a variety of the hardware capabilities of
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// the platform to determine which features can be used to execute the
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// program.
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static void initialize();
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// This allows for early initialization of VM_Version information
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// that may be needed later in the initialization sequence but before
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// full VM_Version initialization is possible. It can not depend on any
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// other part of the VM being initialized when called. Platforms that
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// need to specialize this define VM_Version::early_initialize().
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static void early_initialize() { }
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// Called to initialize VM variables needing initialization
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// after command line parsing. Platforms that need to specialize
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// this should define VM_Version::init_before_ergo().
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static void init_before_ergo() {}
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// Name
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static const char* vm_name();
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// Vendor
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static const char* vm_vendor();
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// VM version information string printed by launcher (java -version)
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static const char* vm_info_string();
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static const char* vm_release();
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static const char* vm_platform_string();
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static const char* vm_build_user();
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static int vm_major_version() { return _vm_major_version; }
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static int vm_minor_version() { return _vm_minor_version; }
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static int vm_security_version() { return _vm_security_version; }
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static int vm_patch_version() { return _vm_patch_version; }
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static int vm_build_number() { return _vm_build_number; }
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// Gets the jvm_version_info.jvm_version defined in jvm.h
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static unsigned int jvm_version();
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// Internal version providing additional build information
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static const char* internal_vm_info_string();
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static const char* jre_release_version();
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static const char* jdk_debug_level();
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static const char* printable_jdk_debug_level();
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static uint64_t features() {
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return _features;
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}
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static const char* features_string() {
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return _features_string;
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}
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// does HW support an 8-byte compare-exchange operation?
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static bool supports_cx8() {
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#ifdef SUPPORTS_NATIVE_CX8
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return true;
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#else
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return _supports_cx8;
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#endif
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}
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// does HW support atomic get-and-set or atomic get-and-add? Used
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// to guide intrinsification decisions for Unsafe atomic ops
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static bool supports_atomic_getset4() {return _supports_atomic_getset4;}
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static bool supports_atomic_getset8() {return _supports_atomic_getset8;}
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static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;}
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static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;}
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static unsigned int logical_processors_per_package() {
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return _logical_processors_per_package;
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}
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static unsigned int L1_data_cache_line_size() {
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return _L1_data_cache_line_size;
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}
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// ARCH specific policy for the BiasedLocking
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static bool use_biased_locking() { return true; }
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// Number of page sizes efficiently supported by the hardware. Most chips now
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// support two sizes, thus this default implementation. Processor-specific
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// subclasses should define new versions to hide this one as needed. Note
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// that the O/S may support more sizes, but at most this many are used.
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static uint page_size_count() { return 2; }
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// Returns the number of parallel threads to be used for VM
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// work. If that number has not been calculated, do so and
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// save it. Returns ParallelGCThreads if it is set on the
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// command line.
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static unsigned int parallel_worker_threads();
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// Calculates and returns the number of parallel threads. May
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// be VM version specific.
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static unsigned int calc_parallel_worker_threads();
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// Does this CPU support spin wait instruction?
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static bool supports_on_spin_wait() { return false; }
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};
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#include CPU_HEADER(vm_version)
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#endif // SHARE_VM_RUNTIME_VM_VERSION_HPP
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