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src/share/vm/runtime/vm_version.hpp@04d83ba48607 (annotated)

src/share/vm/runtime/vm_version.hpp

Thu, 24 May 2018 17:06:56 +0800

author

aoqi

date

Thu, 24 May 2018 17:06:56 +0800

changeset 8604

04d83ba48607

parent 8329

d2dd79a4fd69

parent 6876

710a3c8b516e

child 8856

ac27a9c85bea

permissions

-rw-r--r--

Merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_RUNTIME_VM_VERSION_HPP
aoqi@0	26	#define SHARE_VM_RUNTIME_VM_VERSION_HPP
aoqi@0	27
aoqi@0	28	#include "memory/allocation.hpp"
aoqi@0	29	#include "utilities/ostream.hpp"
aoqi@0	30
aoqi@0	31	// VM_Version provides information about the VM.
aoqi@0	32
aoqi@0	33	class Abstract_VM_Version: AllStatic {
aoqi@0	34	protected:
aoqi@0	35	friend class VMStructs;
aoqi@0	36	static const char* _s_vm_release;
aoqi@0	37	static const char* _s_internal_vm_info_string;
aoqi@0	38	// These are set by machine-dependent initializations
aoqi@0	39	static bool _supports_cx8;
aoqi@0	40	static bool _supports_atomic_getset4;
aoqi@0	41	static bool _supports_atomic_getset8;
aoqi@0	42	static bool _supports_atomic_getadd4;
aoqi@0	43	static bool _supports_atomic_getadd8;
aoqi@0	44	static unsigned int _logical_processors_per_package;
aoqi@0	45	static int _vm_major_version;
aoqi@0	46	static int _vm_minor_version;
aoqi@0	47	static int _vm_build_number;
aoqi@0	48	static bool _initialized;
aoqi@0	49	static int _parallel_worker_threads;
aoqi@0	50	static bool _parallel_worker_threads_initialized;
aoqi@0	51	static int _reserve_for_allocation_prefetch;
aoqi@0	52
aoqi@0	53	static unsigned int nof_parallel_worker_threads(unsigned int num,
aoqi@0	54	unsigned int dem,
aoqi@0	55	unsigned int switch_pt);
aoqi@0	56	public:
poonam@8329	57	// Called as part of the runtime services initialization which is
poonam@8329	58	// called from the management module initialization (via init_globals())
poonam@8329	59	// after argument parsing and attaching of the main thread has
poonam@8329	60	// occurred. Examines a variety of the hardware capabilities of
poonam@8329	61	// the platform to determine which features can be used to execute the
poonam@8329	62	// program.
aoqi@0	63	static void initialize();
aoqi@0	64
bpittore@8046	65	// This allows for early initialization of VM_Version information
bpittore@8046	66	// that may be needed later in the initialization sequence but before
bpittore@8046	67	// full VM_Version initialization is possible. It can not depend on any
bpittore@8046	68	// other part of the VM being initialized when called. Platforms that
bpittore@8046	69	// need to specialize this define VM_Version::early_initialize().
bpittore@8046	70	static void early_initialize() { }
bpittore@8046	71
poonam@8329	72	// Called to initialize VM variables needing initialization
poonam@8329	73	// after command line parsing. Platforms that need to specialize
poonam@8329	74	// this should define VM_Version::init_before_ergo().
poonam@8329	75	static void init_before_ergo() {}
poonam@8329	76
aoqi@0	77	// Name
aoqi@0	78	static const char* vm_name();
aoqi@0	79	// Vendor
aoqi@0	80	static const char* vm_vendor();
aoqi@0	81	// VM version information string printed by launcher (java -version)
aoqi@0	82	static const char* vm_info_string();
aoqi@0	83	static const char* vm_release();
aoqi@0	84	static const char* vm_platform_string();
aoqi@0	85	static const char* vm_build_user();
aoqi@0	86
aoqi@0	87	static int vm_major_version() { assert(_initialized, "not initialized"); return _vm_major_version; }
aoqi@0	88	static int vm_minor_version() { assert(_initialized, "not initialized"); return _vm_minor_version; }
aoqi@0	89	static int vm_build_number() { assert(_initialized, "not initialized"); return _vm_build_number; }
aoqi@0	90
aoqi@0	91	// Gets the jvm_version_info.jvm_version defined in jvm.h
aoqi@0	92	static unsigned int jvm_version();
aoqi@0	93
aoqi@0	94	// Internal version providing additional build information
aoqi@0	95	static const char* internal_vm_info_string();
aoqi@0	96	static const char* jre_release_version();
aoqi@0	97
aoqi@0	98	// does HW support an 8-byte compare-exchange operation?
aoqi@0	99	static bool supports_cx8() {
aoqi@0	100	#ifdef SUPPORTS_NATIVE_CX8
aoqi@0	101	return true;
aoqi@0	102	#else
aoqi@0	103	return _supports_cx8;
aoqi@0	104	#endif
aoqi@0	105	}
aoqi@0	106	// does HW support atomic get-and-set or atomic get-and-add? Used
aoqi@0	107	// to guide intrinsification decisions for Unsafe atomic ops
aoqi@0	108	static bool supports_atomic_getset4() {return _supports_atomic_getset4;}
aoqi@0	109	static bool supports_atomic_getset8() {return _supports_atomic_getset8;}
aoqi@0	110	static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;}
aoqi@0	111	static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;}
aoqi@0	112
aoqi@0	113	static unsigned int logical_processors_per_package() {
aoqi@0	114	return _logical_processors_per_package;
aoqi@0	115	}
aoqi@0	116
aoqi@0	117	// Need a space at the end of TLAB for prefetch instructions
aoqi@0	118	// which may fault when accessing memory outside of heap.
aoqi@0	119	static int reserve_for_allocation_prefetch() {
aoqi@0	120	return _reserve_for_allocation_prefetch;
aoqi@0	121	}
aoqi@0	122
aoqi@0	123	// ARCH specific policy for the BiasedLocking
aoqi@0	124	static bool use_biased_locking() { return true; }
aoqi@0	125
aoqi@0	126	// Number of page sizes efficiently supported by the hardware. Most chips now
aoqi@0	127	// support two sizes, thus this default implementation. Processor-specific
aoqi@0	128	// subclasses should define new versions to hide this one as needed. Note
aoqi@0	129	// that the O/S may support more sizes, but at most this many are used.
aoqi@0	130	static uint page_size_count() { return 2; }
aoqi@0	131
aoqi@0	132	// Returns the number of parallel threads to be used for VM
aoqi@0	133	// work. If that number has not been calculated, do so and
aoqi@0	134	// save it. Returns ParallelGCThreads if it is set on the
aoqi@0	135	// command line.
aoqi@0	136	static unsigned int parallel_worker_threads();
aoqi@0	137	// Calculates and returns the number of parallel threads. May
aoqi@0	138	// be VM version specific.
aoqi@0	139	static unsigned int calc_parallel_worker_threads();
aoqi@0	140	};
aoqi@0	141
aoqi@0	142	#endif // SHARE_VM_RUNTIME_VM_VERSION_HPP