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27 
28 #ifndef V8_PERF_JIT_H_
29 #define V8_PERF_JIT_H_
30 
31 #include "src/log.h"
32 
33 namespace v8 {
34 namespace internal {
35 
36 #if V8_OS_LINUX
37 
38 // Linux perf tool logging support
39 class PerfJitLogger : public CodeEventLogger {
40  public:
41   PerfJitLogger();
42   virtual ~PerfJitLogger();
43 
44   void CodeMoveEvent(AbstractCode* from, Address to) override;
45   void CodeDisableOptEvent(AbstractCode* code,
46                            SharedFunctionInfo* shared) override {}
47 
48  private:
49   void OpenJitDumpFile();
50   void CloseJitDumpFile();
51   void* OpenMarkerFile(int fd);
52   void CloseMarkerFile(void* marker_address);
53 
54   uint64_t GetTimestamp();
55   void LogRecordedBuffer(AbstractCode* code, SharedFunctionInfo* shared,
56                          const char* name, int length) override;
57 
58   // Extension added to V8 log file name to get the low-level log name.
59   static const char kFilenameFormatString[];
60   static const int kFilenameBufferPadding;
61 
62   // File buffer size of the low-level log. We don't use the default to
63   // minimize the associated overhead.
64   static const int kLogBufferSize = 2 * MB;
65 
66   void LogWriteBytes(const char* bytes, int size);
67   void LogWriteHeader();
68   void LogWriteDebugInfo(Code* code, SharedFunctionInfo* shared);
69   void LogWriteUnwindingInfo(Code* code);
70 
71   static const uint32_t kElfMachIA32 = 3;
72   static const uint32_t kElfMachX64 = 62;
73   static const uint32_t kElfMachARM = 40;
74   static const uint32_t kElfMachMIPS = 10;
75   static const uint32_t kElfMachARM64 = 183;
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 #elif V8_TARGET_ARCH_ARM64
87     return kElfMachARM64;
88 #else
89     UNIMPLEMENTED();
90     return 0;
91 #endif
92   }
93 
94   // Per-process singleton file. We assume that there is one main isolate;
95   // to determine when it goes away, we keep reference count.
96   static base::LazyRecursiveMutex file_mutex_;
97   static FILE* perf_output_handle_;
98   static uint64_t reference_count_;
99   static void* marker_address_;
100   static uint64_t code_index_;
101 };
102 
103 #else
104 
105 // PerfJitLogger is only implemented on Linux
106 class PerfJitLogger : public CodeEventLogger {
107  public:
108   void CodeMoveEvent(AbstractCode* from, Address to) override {
109     UNIMPLEMENTED();
110   }
111 
112   void CodeDisableOptEvent(AbstractCode* code,
113                            SharedFunctionInfo* shared) override {
114     UNIMPLEMENTED();
115   }
116 
117   void LogRecordedBuffer(AbstractCode* code, SharedFunctionInfo* shared,
118                          const char* name, int length) override {
119     UNIMPLEMENTED();
120   }
121 };
122 
123 #endif  // V8_OS_LINUX
124 }  // namespace internal
125 }  // namespace v8
126 #endif
127