1// Copyright 2014 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
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5//
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8//     * Redistributions in binary form must reproduce the above
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15//
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26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28#ifndef V8_PERF_JIT_H_
29#define V8_PERF_JIT_H_
30
31#include "src/v8.h"
32
33namespace v8 {
34namespace internal {
35
36// TODO(jarin) For now, we disable perf integration on Android because of a
37// build problem - when building the snapshot with AOSP, librt is not
38// available, so we cannot use the clock_gettime function. To fix this, we
39// should thread through the V8_LIBRT_NOT_AVAILABLE flag here and only disable
40// the perf integration when this flag is present (the perf integration is not
41// needed when generating snapshot, so it is fine to ifdef it away).
42
43#if V8_OS_LINUX
44
45// Linux perf tool logging support
46class PerfJitLogger : public CodeEventLogger {
47 public:
48  PerfJitLogger();
49  virtual ~PerfJitLogger();
50
51  virtual void CodeMoveEvent(Address from, Address to);
52  virtual void CodeDeleteEvent(Address from);
53  virtual void CodeDisableOptEvent(Code* code, SharedFunctionInfo* shared) {}
54  virtual void SnapshotPositionEvent(Address addr, int pos);
55
56 private:
57  uint64_t GetTimestamp();
58  virtual void LogRecordedBuffer(Code* code, SharedFunctionInfo* shared,
59                                 const char* name, int length);
60
61  // Extension added to V8 log file name to get the low-level log name.
62  static const char kFilenameFormatString[];
63  static const int kFilenameBufferPadding;
64
65  // File buffer size of the low-level log. We don't use the default to
66  // minimize the associated overhead.
67  static const int kLogBufferSize = 2 * MB;
68
69  void LogWriteBytes(const char* bytes, int size);
70  void LogWriteHeader();
71
72  static const uint32_t kElfMachIA32 = 3;
73  static const uint32_t kElfMachX64 = 62;
74  static const uint32_t kElfMachARM = 40;
75  static const uint32_t kElfMachMIPS = 10;
76
77  uint32_t GetElfMach() {
78#if V8_TARGET_ARCH_IA32
79    return kElfMachIA32;
80#elif V8_TARGET_ARCH_X64
81    return kElfMachX64;
82#elif V8_TARGET_ARCH_ARM
83    return kElfMachARM;
84#elif V8_TARGET_ARCH_MIPS
85    return kElfMachMIPS;
86#else
87    UNIMPLEMENTED();
88    return 0;
89#endif
90  }
91
92  FILE* perf_output_handle_;
93  uint64_t code_index_;
94};
95
96#else
97
98// PerfJitLogger is only implemented on Linux
99class PerfJitLogger : public CodeEventLogger {
100 public:
101  virtual void CodeMoveEvent(Address from, Address to) { UNIMPLEMENTED(); }
102
103  virtual void CodeDeleteEvent(Address from) { UNIMPLEMENTED(); }
104
105  virtual void CodeDisableOptEvent(Code* code, SharedFunctionInfo* shared) {
106    UNIMPLEMENTED();
107  }
108
109  virtual void SnapshotPositionEvent(Address addr, int pos) { UNIMPLEMENTED(); }
110
111  virtual void LogRecordedBuffer(Code* code, SharedFunctionInfo* shared,
112                                 const char* name, int length) {
113    UNIMPLEMENTED();
114  }
115};
116
117#endif  // V8_OS_LINUX
118}
119}  // namespace v8::internal
120#endif
121