1 /*
2 * Copyright (c) 1997, 2016, 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.
18 *
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
21 * questions.
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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
31 // VM_Version provides information about the VM.
32
33 class Abstract_VM_Version: AllStatic {
34 friend class VMStructs;
35 friend class JVMCIVMStructs;
36
37 protected:
38 static const char* _s_vm_release;
39 static const char* _s_internal_vm_info_string;
40
41 // CPU feature flags.
42 static uint64_t _features;
43 static const char* _features_string;
44
45 // These are set by machine-dependent initializations
46 static bool _supports_cx8;
47 static bool _supports_atomic_getset4;
48 static bool _supports_atomic_getset8;
49 static bool _supports_atomic_getadd4;
50 static bool _supports_atomic_getadd8;
51 static unsigned int _logical_processors_per_package;
52 static unsigned int _L1_data_cache_line_size;
53 static int _vm_major_version;
54 static int _vm_minor_version;
55 static int _vm_security_version;
56 static int _vm_patch_version;
57 static int _vm_build_number;
58 static unsigned int _parallel_worker_threads;
59 static bool _parallel_worker_threads_initialized;
60
61 static unsigned int nof_parallel_worker_threads(unsigned int num,
62 unsigned int dem,
63 unsigned int switch_pt);
64 public:
65 // Called as part of the runtime services initialization which is
66 // called from the management module initialization (via init_globals())
67 // after argument parsing and attaching of the main thread has
68 // occurred. Examines a variety of the hardware capabilities of
69 // the platform to determine which features can be used to execute the
70 // program.
71 static void initialize();
72
73 // This allows for early initialization of VM_Version information
74 // that may be needed later in the initialization sequence but before
75 // full VM_Version initialization is possible. It can not depend on any
76 // other part of the VM being initialized when called. Platforms that
77 // need to specialize this define VM_Version::early_initialize().
78 static void early_initialize() { }
79
80 // Called to initialize VM variables needing initialization
81 // after command line parsing. Platforms that need to specialize
82 // this should define VM_Version::init_before_ergo().
83 static void init_before_ergo() {}
84
85 // Name
86 static const char* vm_name();
87 // Vendor
88 static const char* vm_vendor();
89 // VM version information string printed by launcher (java -version)
90 static const char* vm_info_string();
91 static const char* vm_release();
92 static const char* vm_platform_string();
93 static const char* vm_build_user();
94
95 static int vm_major_version() { return _vm_major_version; }
96 static int vm_minor_version() { return _vm_minor_version; }
97 static int vm_security_version() { return _vm_security_version; }
98 static int vm_patch_version() { return _vm_patch_version; }
99 static int vm_build_number() { return _vm_build_number; }
100
101 // Gets the jvm_version_info.jvm_version defined in jvm.h
102 static unsigned int jvm_version();
103
104 // Internal version providing additional build information
105 static const char* internal_vm_info_string();
106 static const char* jre_release_version();
107 static const char* jdk_debug_level();
108 static const char* printable_jdk_debug_level();
109
110 static uint64_t features() {
111 return _features;
112 }
113
114 static const char* features_string() {
115 return _features_string;
116 }
117
118 // does HW support an 8-byte compare-exchange operation?
119 static bool supports_cx8() {
120 #ifdef SUPPORTS_NATIVE_CX8
121 return true;
122 #else
123 return _supports_cx8;
124 #endif
125 }
126 // does HW support atomic get-and-set or atomic get-and-add? Used
127 // to guide intrinsification decisions for Unsafe atomic ops
128 static bool supports_atomic_getset4() {return _supports_atomic_getset4;}
129 static bool supports_atomic_getset8() {return _supports_atomic_getset8;}
130 static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;}
131 static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;}
132
133 static unsigned int logical_processors_per_package() {
134 return _logical_processors_per_package;
135 }
136
137 static unsigned int L1_data_cache_line_size() {
138 return _L1_data_cache_line_size;
139 }
140
141 // ARCH specific policy for the BiasedLocking
142 static bool use_biased_locking() { return true; }
143
144 // Number of page sizes efficiently supported by the hardware. Most chips now
145 // support two sizes, thus this default implementation. Processor-specific
146 // subclasses should define new versions to hide this one as needed. Note
147 // that the O/S may support more sizes, but at most this many are used.
148 static uint page_size_count() { return 2; }
149
150 // Returns the number of parallel threads to be used for VM
151 // work. If that number has not been calculated, do so and
152 // save it. Returns ParallelGCThreads if it is set on the
153 // command line.
154 static unsigned int parallel_worker_threads();
155 // Calculates and returns the number of parallel threads. May
156 // be VM version specific.
157 static unsigned int calc_parallel_worker_threads();
158
159 // Does this CPU support spin wait instruction?
160 static bool supports_on_spin_wait() { return false; }
161 };
162
163 #ifdef TARGET_ARCH_x86
164 # include "vm_version_x86.hpp"
165 #endif
166 #ifdef TARGET_ARCH_sparc
167 # include "vm_version_sparc.hpp"
168 #endif
169 #ifdef TARGET_ARCH_zero
170 # include "vm_version_zero.hpp"
171 #endif
172 #ifdef TARGET_ARCH_arm
173 # include "vm_version_arm.hpp"
174 #endif
175 #ifdef TARGET_ARCH_ppc
176 # include "vm_version_ppc.hpp"
177 #endif
178
179 #endif // SHARE_VM_RUNTIME_VM_VERSION_HPP