vm_version.hpp revision 11658:8a5735c11a84 
1/*
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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#include "utilities/macros.hpp"
31
32// VM_Version provides information about the VM.
33
34class 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  static unsigned int _parallel_worker_threads;
60  static bool         _parallel_worker_threads_initialized;
61
62  static unsigned int nof_parallel_worker_threads(unsigned int num,
63                                                  unsigned int dem,
64                                                  unsigned int switch_pt);
65 public:
66  // Called as part of the runtime services initialization which is
67  // called from the management module initialization (via init_globals())
68  // after argument parsing and attaching of the main thread has
69  // occurred.  Examines a variety of the hardware capabilities of
70  // the platform to determine which features can be used to execute the
71  // program.
72  static void initialize();
73
74  // This allows for early initialization of VM_Version information
75  // that may be needed later in the initialization sequence but before
76  // full VM_Version initialization is possible. It can not depend on any
77  // other part of the VM being initialized when called. Platforms that
78  // need to specialize this define VM_Version::early_initialize().
79  static void early_initialize() { }
80
81  // Called to initialize VM variables needing initialization
82  // after command line parsing. Platforms that need to specialize
83  // this should define VM_Version::init_before_ergo().
84  static void init_before_ergo() {}
85
86  // Name
87  static const char* vm_name();
88  // Vendor
89  static const char* vm_vendor();
90  // VM version information string printed by launcher (java -version)
91  static const char* vm_info_string();
92  static const char* vm_release();
93  static const char* vm_platform_string();
94  static const char* vm_build_user();
95
96  static int vm_major_version()               { return _vm_major_version; }
97  static int vm_minor_version()               { return _vm_minor_version; }
98  static int vm_security_version()            { return _vm_security_version; }
99  static int vm_patch_version()               { return _vm_patch_version; }
100  static int vm_build_number()                { return _vm_build_number; }
101
102  // Gets the jvm_version_info.jvm_version defined in jvm.h
103  static unsigned int jvm_version();
104
105  // Internal version providing additional build information
106  static const char* internal_vm_info_string();
107  static const char* jre_release_version();
108  static const char* jdk_debug_level();
109  static const char* printable_jdk_debug_level();
110
111  static uint64_t features() {
112    return _features;
113  }
114
115  static const char* features_string() {
116    return _features_string;
117  }
118
119  // does HW support an 8-byte compare-exchange operation?
120  static bool supports_cx8()  {
121#ifdef SUPPORTS_NATIVE_CX8
122    return true;
123#else
124    return _supports_cx8;
125#endif
126  }
127  // does HW support atomic get-and-set or atomic get-and-add?  Used
128  // to guide intrinsification decisions for Unsafe atomic ops
129  static bool supports_atomic_getset4()  {return _supports_atomic_getset4;}
130  static bool supports_atomic_getset8()  {return _supports_atomic_getset8;}
131  static bool supports_atomic_getadd4()  {return _supports_atomic_getadd4;}
132  static bool supports_atomic_getadd8()  {return _supports_atomic_getadd8;}
133
134  static unsigned int logical_processors_per_package() {
135    return _logical_processors_per_package;
136  }
137
138  static unsigned int L1_data_cache_line_size() {
139    return _L1_data_cache_line_size;
140  }
141
142  // ARCH specific policy for the BiasedLocking
143  static bool use_biased_locking()  { return true; }
144
145  // Number of page sizes efficiently supported by the hardware.  Most chips now
146  // support two sizes, thus this default implementation.  Processor-specific
147  // subclasses should define new versions to hide this one as needed.  Note
148  // that the O/S may support more sizes, but at most this many are used.
149  static uint page_size_count() { return 2; }
150
151  // Returns the number of parallel threads to be used for VM
152  // work.  If that number has not been calculated, do so and
153  // save it.  Returns ParallelGCThreads if it is set on the
154  // command line.
155  static unsigned int parallel_worker_threads();
156  // Calculates and returns the number of parallel threads.  May
157  // be VM version specific.
158  static unsigned int calc_parallel_worker_threads();
159
160  // Does this CPU support spin wait instruction?
161  static bool supports_on_spin_wait() { return false; }
162};
163
164#include CPU_HEADER(vm_version)
165
166#endif // SHARE_VM_RUNTIME_VM_VERSION_HPP
167