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      1 // Copyright 2016 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
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     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/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