Simplify some code related to x64 calling convention.

src/x64/deoptimizer-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 591 matching lines @@
   // We push all registers onto the stack, even though we do not need
   // to restore all later.
   for (int i = 0; i < kNumberOfRegisters; i++) {
     Register r = Register::from_code(i);
     __ push(r);
   }
 
   const int kSavedRegistersAreaSize = kNumberOfRegisters * kPointerSize +
                                       kDoubleRegsSize;
 
-  // When calling new_deoptimizer_function we need to pass the last argument
-  // on the stack on windows and in r8 on linux. The remaining arguments are
-  // all passed in registers (different ones on linux and windows though).
-
-#ifdef _WIN64
-  Register arg4 = r9;
-  Register arg3 = r8;
-  Register arg2 = rdx;
-  Register arg1 = rcx;
-#else
-  Register arg4 = rcx;
-  Register arg3 = rdx;
-  Register arg2 = rsi;
-  Register arg1 = rdi;
-#endif
-
   // We use this to keep the value of the fifth argument temporarily.
   // Unfortunately we can't store it directly in r8 (used for passing
   // this on linux), since it is another parameter passing register on windows.
   Register arg5 = r11;
 
   // Get the bailout id from the stack.
-  __ movq(arg3, Operand(rsp, kSavedRegistersAreaSize));
+  __ movq(arg_reg_3, Operand(rsp, kSavedRegistersAreaSize));
 
   // Get the address of the location in the code object if possible
   // and compute the fp-to-sp delta in register arg5.
   if (type() == EAGER) {
-    __ Set(arg4, 0);
+    __ Set(arg_reg_4, 0);
     __ lea(arg5, Operand(rsp, kSavedRegistersAreaSize + 1 * kPointerSize));
   } else {
-    __ movq(arg4, Operand(rsp, kSavedRegistersAreaSize + 1 * kPointerSize));
+    __ movq(arg_reg_4,
+            Operand(rsp, kSavedRegistersAreaSize + 1 * kPointerSize));
     __ lea(arg5, Operand(rsp, kSavedRegistersAreaSize + 2 * kPointerSize));
   }
 
   __ subq(arg5, rbp);
   __ neg(arg5);
 
   // Allocate a new deoptimizer object.
   __ PrepareCallCFunction(6);
   __ movq(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
-  __ movq(arg1, rax);
-  __ Set(arg2, type());
+  __ movq(arg_reg_1, rax);
+  __ Set(arg_reg_2, type());
   // Args 3 and 4 are already in the right registers.
 
   // On windows put the arguments on the stack (PrepareCallCFunction
   // has created space for this). On linux pass the arguments in r8 and r9.
 #ifdef _WIN64
   __ movq(Operand(rsp, 4 * kPointerSize), arg5);
   __ LoadAddress(arg5, ExternalReference::isolate_address(isolate()));
   __ movq(Operand(rsp, 5 * kPointerSize), arg5);
 #else
   __ movq(r8, arg5);
@@ skipping 42 matching lines @@
   __ bind(&pop_loop);
   __ pop(Operand(rdx, 0));
   __ addq(rdx, Immediate(sizeof(intptr_t)));
   __ bind(&pop_loop_header);
   __ cmpq(rcx, rsp);
   __ j(not_equal, &pop_loop);
 
   // Compute the output frame in the deoptimizer.
   __ push(rax);
   __ PrepareCallCFunction(2);
-  __ movq(arg1, rax);
-  __ LoadAddress(arg2, ExternalReference::isolate_address(isolate()));
+  __ movq(arg_reg_1, rax);
+  __ LoadAddress(arg_reg_2, ExternalReference::isolate_address(isolate()));
   {
     AllowExternalCallThatCantCauseGC scope(masm());
     __ CallCFunction(
         ExternalReference::compute_output_frames_function(isolate()), 2);
   }
   __ pop(rax);
 
   // Replace the current frame with the output frames.
   Label outer_push_loop, inner_push_loop,
       outer_loop_header, inner_loop_header;
@@ skipping 71 matching lines @@
   }
   __ bind(&done);
 }
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64