vm_version.hpp revision 11166:6525e4ba82a1 
1/*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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7 * published by the Free Software Foundation.
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11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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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
33class 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
180