perf-jit.h

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// Copyright 2014 the V8 project authors. All rights reserved.
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#ifndef V8_PERF_JIT_H_
#define V8_PERF_JIT_H_
 
#include "src/v8.h"
 
namespace v8 {
namespace internal {
 
// TODO(jarin) For now, we disable perf integration on Android because of a
// build problem - when building the snapshot with AOSP, librt is not
// available, so we cannot use the clock_gettime function. To fix this, we
// should thread through the V8_LIBRT_NOT_AVAILABLE flag here and only disable
// the perf integration when this flag is present (the perf integration is not
// needed when generating snapshot, so it is fine to ifdef it away).
 
#if V8_OS_LINUX
 
// Linux perf tool logging support
class PerfJitLogger : public CodeEventLogger {
 public:
  PerfJitLogger();
  virtual ~PerfJitLogger();
 
  virtual void CodeMoveEvent(Address from, Address to);
  virtual void CodeDeleteEvent(Address from);
  virtual void CodeDisableOptEvent(Code* code, SharedFunctionInfo* shared) {}
  virtual void SnapshotPositionEvent(Address addr, int pos);
 
 private:
  uint64_t GetTimestamp();
  virtual void LogRecordedBuffer(Code* code, SharedFunctionInfo* shared,
                                 const char* name, int length);
 
  // Extension added to V8 log file name to get the low-level log name.
  static const char kFilenameFormatString[];
  static const int kFilenameBufferPadding;
 
  // File buffer size of the low-level log. We don't use the default to
  // minimize the associated overhead.
  static const int kLogBufferSize = 2 * MB;
 
  void LogWriteBytes(const char* bytes, int size);
  void LogWriteHeader();
 
  static const uint32_t kElfMachIA32 = 3;
  static const uint32_t kElfMachX64 = 62;
  static const uint32_t kElfMachARM = 40;
  static const uint32_t kElfMachMIPS = 10;
 
  uint32_t GetElfMach() {
#if V8_TARGET_ARCH_IA32
    return kElfMachIA32;
#elif V8_TARGET_ARCH_X64
    return kElfMachX64;
#elif V8_TARGET_ARCH_ARM
    return kElfMachARM;
#elif V8_TARGET_ARCH_MIPS
    return kElfMachMIPS;
#else
    UNIMPLEMENTED();
    return 0;
#endif
  }
 
  FILE* perf_output_handle_;
  uint64_t code_index_;
};
 
#else
 
// PerfJitLogger is only implemented on Linux
class PerfJitLogger : public CodeEventLogger {
 public:
  virtual void CodeMoveEvent(Address from, Address to) { UNIMPLEMENTED(); }
 
  virtual void CodeDeleteEvent(Address from) { UNIMPLEMENTED(); }
 
  virtual void CodeDisableOptEvent(Code* code, SharedFunctionInfo* shared) {
    UNIMPLEMENTED();
  }
 
  virtual void SnapshotPositionEvent(Address addr, int pos) { UNIMPLEMENTED(); }
 
  virtual void LogRecordedBuffer(Code* code, SharedFunctionInfo* shared,
                                 const char* name, int length) {
    UNIMPLEMENTED();
  }
};
 
#endif  // V8_OS_LINUX
}
}  // namespace v8::internal
#endif