MIPS: Added data tracing to simulator

src/mips/simulator-mips.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 // Declares a Simulator for MIPS instructions if we are not generating a native
 // MIPS binary. This Simulator allows us to run and debug MIPS code generation
 // on regular desktop machines.
 // V8 calls into generated code by "calling" the CALL_GENERATED_CODE macro,
 // which will start execution in the Simulator or forwards to the real entry
@@ skipping 250 matching lines @@
   // Note: Overloaded on the sign of the value.
   inline void WriteH(int32_t addr, uint16_t value, Instruction* instr);
   inline void WriteH(int32_t addr, int16_t value, Instruction* instr);
 
   inline int ReadW(int32_t addr, Instruction* instr);
   inline void WriteW(int32_t addr, int value, Instruction* instr);
 
   inline double ReadD(int32_t addr, Instruction* instr);
   inline void WriteD(int32_t addr, double value, Instruction* instr);
 
+  // Helpers for data value tracing.
+  enum TraceType {
+    BYTE,
+    HALF,
+    WORD
+    // DWORD,
+    // DFLOAT - Floats may have printing issues due to paired lwc1's
+  };
+
+  void TraceRegWr(int32_t value);
+  void TraceMemWr(int32_t addr, int32_t value, TraceType t);
+  void TraceMemRd(int32_t addr, int32_t value);
+  EmbeddedVector<char, 128> trace_buf_;
+
   // Operations depending on endianness.
   // Get Double Higher / Lower word.
   inline int32_t GetDoubleHIW(double* addr);
   inline int32_t GetDoubleLOW(double* addr);
   // Set Double Higher / Lower word.
   inline int32_t SetDoubleHIW(double* addr);
   inline int32_t SetDoubleLOW(double* addr);
 
   // Executing is handled based on the instruction type.
   void DecodeTypeRegister(Instruction* instr);
@@ skipping 188 matching lines @@
 
   static inline void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // !defined(USE_SIMULATOR)
 #endif  // V8_MIPS_SIMULATOR_MIPS_H_