1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
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23 */
24
25 #ifndef SHARE_VM_RUNTIME_VM_VERSION_HPP
26 #define SHARE_VM_RUNTIME_VM_VERSION_HPP
27
28 #include "memory/allocation.hpp"
29 #include "utilities/ostream.hpp"
30 #include "utilities/macros.hpp"
31
32 // VM_Version provides information about the VM.
33
34 class Abstract_VM_Version: AllStatic {
35 friend class VMStructs;
36 friend class JVMCIVMStructs;
37
38 protected:
39 static const char* _s_vm_release;
40 static const char* _s_internal_vm_info_string;
41
42 // CPU feature flags.
43 static uint64_t _features;
44 static const char* _features_string;
45
46 // These are set by machine-dependent initializations
47 static bool _supports_cx8;
48 static bool _supports_atomic_getset4;
49 static bool _supports_atomic_getset8;
50 static bool _supports_atomic_getadd4;
51 static bool _supports_atomic_getadd8;
52 static unsigned int _logical_processors_per_package;
53 static unsigned int _L1_data_cache_line_size;
54 static int _vm_major_version;
55 static int _vm_minor_version;
56 static int _vm_security_version;
57 static int _vm_patch_version;
58 static int _vm_build_number;
59
60 public:
61 // Called as part of the runtime services initialization which is
62 // called from the management module initialization (via init_globals())
63 // after argument parsing and attaching of the main thread has
64 // occurred. Examines a variety of the hardware capabilities of
65 // the platform to determine which features can be used to execute the
66 // program.
67 static void initialize() { }
68
69 // This allows for early initialization of VM_Version information
70 // that may be needed later in the initialization sequence but before
71 // full VM_Version initialization is possible. It can not depend on any
72 // other part of the VM being initialized when called. Platforms that
73 // need to specialize this define VM_Version::early_initialize().
74 static void early_initialize() { }
75
76 // Called to initialize VM variables needing initialization
77 // after command line parsing. Platforms that need to specialize
78 // this should define VM_Version::init_before_ergo().
79 static void init_before_ergo() {}
80
81 // Name
82 static const char* vm_name();
83 // Vendor
84 static const char* vm_vendor();
85 // VM version information string printed by launcher (java -version)
86 static const char* vm_info_string();
87 static const char* vm_release();
88 static const char* vm_platform_string();
89 static const char* vm_build_user();
90
91 static int vm_major_version() { return _vm_major_version; }
92 static int vm_minor_version() { return _vm_minor_version; }
93 static int vm_security_version() { return _vm_security_version; }
94 static int vm_patch_version() { return _vm_patch_version; }
95 static int vm_build_number() { return _vm_build_number; }
96
97 // Gets the jvm_version_info.jvm_version defined in jvm.h
98 static unsigned int jvm_version();
99
100 // Internal version providing additional build information
101 static const char* internal_vm_info_string();
102 static const char* jre_release_version();
103 static const char* jdk_debug_level();
104 static const char* printable_jdk_debug_level();
105
106 static uint64_t features() {
107 return _features;
108 }
109
110 static const char* features_string() {
111 return _features_string;
112 }
113
114 // does HW support an 8-byte compare-exchange operation?
115 static bool supports_cx8() {
116 #ifdef SUPPORTS_NATIVE_CX8
117 return true;
118 #else
119 return _supports_cx8;
120 #endif
121 }
122 // does HW support atomic get-and-set or atomic get-and-add? Used
123 // to guide intrinsification decisions for Unsafe atomic ops
124 static bool supports_atomic_getset4() {return _supports_atomic_getset4;}
125 static bool supports_atomic_getset8() {return _supports_atomic_getset8;}
126 static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;}
127 static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;}
128
129 static unsigned int logical_processors_per_package() {
130 return _logical_processors_per_package;
131 }
132
133 static unsigned int L1_data_cache_line_size() {
134 return _L1_data_cache_line_size;
135 }
136
137 // ARCH specific policy for the BiasedLocking
138 static bool use_biased_locking() { return true; }
139
140 // Number of page sizes efficiently supported by the hardware. Most chips now
141 // support two sizes, thus this default implementation. Processor-specific
142 // subclasses should define new versions to hide this one as needed. Note
143 // that the O/S may support more sizes, but at most this many are used.
144 static uint page_size_count() { return 2; }
145
146 // Returns the number of parallel threads to be used for VM
147 // work. If that number has not been calculated, do so and
148 // save it. Returns ParallelGCThreads if it is set on the
149 // command line.
150 static unsigned int parallel_worker_threads();
151
152 // Denominator for computing default ParallelGCThreads for machines with
153 // a large number of cores.
154 static uint parallel_worker_threads_denominator() { return 8; }
155
156 // Does this CPU support spin wait instruction?
157 static bool supports_on_spin_wait() { return false; }
158 };
159
160 #include CPU_HEADER(vm_version)
161
162 #endif // SHARE_VM_RUNTIME_VM_VERSION_HPP