PPC: Support for conditional return instruction.

src/ppc/simulator-ppc.h

 // Copyright 2014 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 PPC instructions if we are not generating a native
 // PPC binary. This Simulator allows us to run and debug PPC 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 235 matching lines @@
     // Known bad pc value to ensure that the simulator does not execute
     // without being properly setup.
     bad_lr = -1,
     // A pc value used to signal the simulator to stop execution.  Generally
     // the lr is set to this value on transition from native C code to
     // simulated execution, so that the simulator can "return" to the native
     // C code.
     end_sim_pc = -2
   };
 
+  enum BCType { BC_OFFSET, BC_LINK_REG, BC_CTR_REG };
+
   // Unsupported instructions use Format to print an error and stop execution.
   void Format(Instruction* instr, const char* format);
 
   // Helper functions to set the conditional flags in the architecture state.
   bool CarryFrom(int32_t left, int32_t right, int32_t carry = 0);
   bool BorrowFrom(int32_t left, int32_t right);
   bool OverflowFrom(int32_t alu_out, int32_t left, int32_t right,
                     bool addition);
 
   // Helper functions to decode common "addressing" modes
@@ skipping 29 matching lines @@
   inline uint32_t ReadWU(intptr_t addr, Instruction* instr);
   inline int32_t ReadW(intptr_t addr, Instruction* instr);
   inline void WriteW(intptr_t addr, uint32_t value, Instruction* instr);
   inline void WriteW(intptr_t addr, int32_t value, Instruction* instr);
 
   intptr_t* ReadDW(intptr_t addr);
   void WriteDW(intptr_t addr, int64_t value);
 
   void Trace(Instruction* instr);
   void SetCR0(intptr_t result, bool setSO = false);
-  void ExecuteBranchConditional(Instruction* instr);
+  void ExecuteBranchConditional(Instruction* instr, BCType type);
   void ExecuteExt1(Instruction* instr);
   bool ExecuteExt2_10bit(Instruction* instr);
   bool ExecuteExt2_9bit_part1(Instruction* instr);
   bool ExecuteExt2_9bit_part2(Instruction* instr);
   void ExecuteExt2_5bit(Instruction* instr);
   void ExecuteExt2(Instruction* instr);
   void ExecuteExt4(Instruction* instr);
 #if V8_TARGET_ARCH_PPC64
   void ExecuteExt5(Instruction* instr);
 #endif
@@ skipping 103 matching lines @@
 
   static inline void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
 }
 }  // namespace v8::internal
 
 #endif  // !defined(USE_SIMULATOR)
 #endif  // V8_PPC_SIMULATOR_PPC_H_