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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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116 | 116 |
117 class OS { | 117 class OS { |
118 public: | 118 public: |
119 // Initializes the platform OS support. Called once at VM startup. | 119 // Initializes the platform OS support. Called once at VM startup. |
120 static void SetUp(); | 120 static void SetUp(); |
121 | 121 |
122 // Initializes the platform OS support that depend on CPU features. This is | 122 // Initializes the platform OS support that depend on CPU features. This is |
123 // called after CPU initialization. | 123 // called after CPU initialization. |
124 static void PostSetUp(); | 124 static void PostSetUp(); |
125 | 125 |
| 126 // Clean up platform-OS-related things. Called once at VM shutdown. |
| 127 static void TearDown(); |
| 128 |
126 // Returns the accumulated user time for thread. This routine | 129 // Returns the accumulated user time for thread. This routine |
127 // can be used for profiling. The implementation should | 130 // can be used for profiling. The implementation should |
128 // strive for high-precision timer resolution, preferable | 131 // strive for high-precision timer resolution, preferable |
129 // micro-second resolution. | 132 // micro-second resolution. |
130 static int GetUserTime(uint32_t* secs, uint32_t* usecs); | 133 static int GetUserTime(uint32_t* secs, uint32_t* usecs); |
131 | 134 |
132 // Get a tick counter normalized to one tick per microsecond. | 135 // Get a tick counter normalized to one tick per microsecond. |
133 // Used for calculating time intervals. | 136 // Used for calculating time intervals. |
134 static int64_t Ticks(); | 137 static int64_t Ticks(); |
135 | 138 |
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753 Atomic32 active_; | 756 Atomic32 active_; |
754 PlatformData* data_; // Platform specific data. | 757 PlatformData* data_; // Platform specific data. |
755 int samples_taken_; // Counts stack samples taken. | 758 int samples_taken_; // Counts stack samples taken. |
756 DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler); | 759 DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler); |
757 }; | 760 }; |
758 | 761 |
759 | 762 |
760 } } // namespace v8::internal | 763 } } // namespace v8::internal |
761 | 764 |
762 #endif // V8_PLATFORM_H_ | 765 #endif // V8_PLATFORM_H_ |
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