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src/share/vm/runtime/vm_version.hpp@7eca5de9e0b6 (annotated)

src/share/vm/runtime/vm_version.hpp

Thu, 20 Sep 2012 16:49:17 +0200

author

roland

date

Thu, 20 Sep 2012 16:49:17 +0200

changeset 4106

7eca5de9e0b6

parent 3517

c77d473e71f7

child 4153

b9a9ed0f8eeb

permissions

-rw-r--r--

7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement()
Summary: use shorter instruction sequences for atomic add and atomic exchange when possible.
Reviewed-by: kvn, jrose

duke@435	1	/*
trims@2708	2	* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_RUNTIME_VM_VERSION_HPP
stefank@2314	26	#define SHARE_VM_RUNTIME_VM_VERSION_HPP
stefank@2314	27
stefank@2314	28	#include "memory/allocation.hpp"
stefank@2314	29	#include "utilities/ostream.hpp"
stefank@2314	30
duke@435	31	// VM_Version provides information about the VM.
duke@435	32
duke@435	33	class Abstract_VM_Version: AllStatic {
duke@435	34	protected:
duke@435	35	friend class VMStructs;
duke@435	36	static const char* _s_vm_release;
duke@435	37	static const char* _s_internal_vm_info_string;
duke@435	38	// These are set by machine-dependent initializations
duke@435	39	static bool _supports_cx8;
roland@4106	40	static bool _supports_atomic_getset4;
roland@4106	41	static bool _supports_atomic_getset8;
roland@4106	42	static bool _supports_atomic_getadd4;
roland@4106	43	static bool _supports_atomic_getadd8;
duke@435	44	static unsigned int _logical_processors_per_package;
duke@435	45	static int _vm_major_version;
duke@435	46	static int _vm_minor_version;
duke@435	47	static int _vm_build_number;
duke@435	48	static bool _initialized;
jmasa@445	49	static int _parallel_worker_threads;
jmasa@445	50	static bool _parallel_worker_threads_initialized;
kvn@3052	51	static int _reserve_for_allocation_prefetch;
jmasa@445	52
jmasa@445	53	static unsigned int nof_parallel_worker_threads(unsigned int num,
jmasa@445	54	unsigned int dem,
jmasa@445	55	unsigned int switch_pt);
duke@435	56	public:
duke@435	57	static void initialize();
duke@435	58
duke@435	59	// Name
duke@435	60	static const char* vm_name();
duke@435	61	// Vendor
duke@435	62	static const char* vm_vendor();
duke@435	63	// VM version information string printed by launcher (java -version)
duke@435	64	static const char* vm_info_string();
duke@435	65	static const char* vm_release();
duke@435	66	static const char* vm_platform_string();
kamg@2515	67	static const char* vm_build_user();
duke@435	68
duke@435	69	static int vm_major_version() { assert(_initialized, "not initialized"); return _vm_major_version; }
duke@435	70	static int vm_minor_version() { assert(_initialized, "not initialized"); return _vm_minor_version; }
duke@435	71	static int vm_build_number() { assert(_initialized, "not initialized"); return _vm_build_number; }
duke@435	72
duke@435	73	// Gets the jvm_version_info.jvm_version defined in jvm.h
duke@435	74	static unsigned int jvm_version();
duke@435	75
duke@435	76	// Internal version providing additional build information
duke@435	77	static const char* internal_vm_info_string();
ohrstrom@3517	78	static const char* jre_release_version();
duke@435	79
duke@435	80	// does HW support an 8-byte compare-exchange operation?
duke@435	81	static bool supports_cx8() {return _supports_cx8;}
roland@4106	82	// does HW support atomic get-and-set or atomic get-and-add? Used
roland@4106	83	// to guide intrinsification decisions for Unsafe atomic ops
roland@4106	84	static bool supports_atomic_getset4() {return _supports_atomic_getset4;}
roland@4106	85	static bool supports_atomic_getset8() {return _supports_atomic_getset8;}
roland@4106	86	static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;}
roland@4106	87	static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;}
roland@4106	88
duke@435	89	static unsigned int logical_processors_per_package() {
duke@435	90	return _logical_processors_per_package;
duke@435	91	}
duke@435	92
kvn@3052	93	// Need a space at the end of TLAB for prefetch instructions
kvn@3052	94	// which may fault when accessing memory outside of heap.
kvn@3052	95	static int reserve_for_allocation_prefetch() {
kvn@3052	96	return _reserve_for_allocation_prefetch;
kvn@3052	97	}
kvn@3052	98
bobv@2036	99	// ARCH specific policy for the BiasedLocking
bobv@2036	100	static bool use_biased_locking() { return true; }
bobv@2036	101
duke@435	102	// Number of page sizes efficiently supported by the hardware. Most chips now
duke@435	103	// support two sizes, thus this default implementation. Processor-specific
duke@435	104	// subclasses should define new versions to hide this one as needed. Note
duke@435	105	// that the O/S may support more sizes, but at most this many are used.
duke@435	106	static uint page_size_count() { return 2; }
jmasa@445	107
jmasa@445	108	// Returns the number of parallel threads to be used for VM
jmasa@445	109	// work. If that number has not been calculated, do so and
jmasa@445	110	// save it. Returns ParallelGCThreads if it is set on the
jmasa@445	111	// command line.
jmasa@445	112	static unsigned int parallel_worker_threads();
jmasa@445	113	// Calculates and returns the number of parallel threads. May
jmasa@445	114	// be VM version specific.
jmasa@445	115	static unsigned int calc_parallel_worker_threads();
duke@435	116	};
stefank@2314	117
stefank@2314	118	#endif // SHARE_VM_RUNTIME_VM_VERSION_HPP