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src/share/vm/runtime/vm_version.hpp@710a3c8b516e (annotated)
src/share/vm/runtime/vm_version.hpp
Tue, 08 Aug 2017 15:57:29 +0800
- author
- aoqi
- date
- Tue, 08 Aug 2017 15:57:29 +0800
- changeset 6876
- 710a3c8b516e
- parent 6198
- 55fb97c4c58d
- parent 0
- f90c822e73f8
- child 8604
- 04d83ba48607
- 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: |
| aoqi@0 | 57 | static void initialize(); |
| aoqi@0 | 58 | |
| aoqi@0 | 59 | // Name |
| aoqi@0 | 60 | static const char* vm_name(); |
| aoqi@0 | 61 | // Vendor |
| aoqi@0 | 62 | static const char* vm_vendor(); |
| aoqi@0 | 63 | // VM version information string printed by launcher (java -version) |
| aoqi@0 | 64 | static const char* vm_info_string(); |
| aoqi@0 | 65 | static const char* vm_release(); |
| aoqi@0 | 66 | static const char* vm_platform_string(); |
| aoqi@0 | 67 | static const char* vm_build_user(); |
| aoqi@0 | 68 | |
| aoqi@0 | 69 | static int vm_major_version() { assert(_initialized, "not initialized"); return _vm_major_version; } |
| aoqi@0 | 70 | static int vm_minor_version() { assert(_initialized, "not initialized"); return _vm_minor_version; } |
| aoqi@0 | 71 | static int vm_build_number() { assert(_initialized, "not initialized"); return _vm_build_number; } |
| aoqi@0 | 72 | |
| aoqi@0 | 73 | // Gets the jvm_version_info.jvm_version defined in jvm.h |
| aoqi@0 | 74 | static unsigned int jvm_version(); |
| aoqi@0 | 75 | |
| aoqi@0 | 76 | // Internal version providing additional build information |
| aoqi@0 | 77 | static const char* internal_vm_info_string(); |
| aoqi@0 | 78 | static const char* jre_release_version(); |
| aoqi@0 | 79 | |
| aoqi@0 | 80 | // does HW support an 8-byte compare-exchange operation? |
| aoqi@0 | 81 | static bool supports_cx8() { |
| aoqi@0 | 82 | #ifdef SUPPORTS_NATIVE_CX8 |
| aoqi@0 | 83 | return true; |
| aoqi@0 | 84 | #else |
| aoqi@0 | 85 | return _supports_cx8; |
| aoqi@0 | 86 | #endif |
| aoqi@0 | 87 | } |
| aoqi@0 | 88 | // does HW support atomic get-and-set or atomic get-and-add? Used |
| aoqi@0 | 89 | // to guide intrinsification decisions for Unsafe atomic ops |
| aoqi@0 | 90 | static bool supports_atomic_getset4() {return _supports_atomic_getset4;} |
| aoqi@0 | 91 | static bool supports_atomic_getset8() {return _supports_atomic_getset8;} |
| aoqi@0 | 92 | static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;} |
| aoqi@0 | 93 | static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;} |
| aoqi@0 | 94 | |
| aoqi@0 | 95 | static unsigned int logical_processors_per_package() { |
| aoqi@0 | 96 | return _logical_processors_per_package; |
| aoqi@0 | 97 | } |
| aoqi@0 | 98 | |
| aoqi@0 | 99 | // Need a space at the end of TLAB for prefetch instructions |
| aoqi@0 | 100 | // which may fault when accessing memory outside of heap. |
| aoqi@0 | 101 | static int reserve_for_allocation_prefetch() { |
| aoqi@0 | 102 | return _reserve_for_allocation_prefetch; |
| aoqi@0 | 103 | } |
| aoqi@0 | 104 | |
| aoqi@0 | 105 | // ARCH specific policy for the BiasedLocking |
| aoqi@0 | 106 | static bool use_biased_locking() { return true; } |
| aoqi@0 | 107 | |
| aoqi@0 | 108 | // Number of page sizes efficiently supported by the hardware. Most chips now |
| aoqi@0 | 109 | // support two sizes, thus this default implementation. Processor-specific |
| aoqi@0 | 110 | // subclasses should define new versions to hide this one as needed. Note |
| aoqi@0 | 111 | // that the O/S may support more sizes, but at most this many are used. |
| aoqi@0 | 112 | static uint page_size_count() { return 2; } |
| aoqi@0 | 113 | |
| aoqi@0 | 114 | // Returns the number of parallel threads to be used for VM |
| aoqi@0 | 115 | // work. If that number has not been calculated, do so and |
| aoqi@0 | 116 | // save it. Returns ParallelGCThreads if it is set on the |
| aoqi@0 | 117 | // command line. |
| aoqi@0 | 118 | static unsigned int parallel_worker_threads(); |
| aoqi@0 | 119 | // Calculates and returns the number of parallel threads. May |
| aoqi@0 | 120 | // be VM version specific. |
| aoqi@0 | 121 | static unsigned int calc_parallel_worker_threads(); |
| aoqi@0 | 122 | }; |
| aoqi@0 | 123 | |
| aoqi@0 | 124 | #endif // SHARE_VM_RUNTIME_VM_VERSION_HPP |
