X87: [Interpreter] Remove register file register and replace with LoadParentFramePointer.

src/x87/builtins-x87.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_X87
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 596 matching lines @@
     __ push(eax);
     // Continue loop if not done.
     __ bind(&loop_check);
     __ sub(ebx, Immediate(kPointerSize));
     __ j(greater_equal, &loop_header);
   }
 
   // Load accumulator, register file, bytecode offset, dispatch table into
   // registers.
   __ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
-  __ mov(kInterpreterRegisterFileRegister, ebp);
-  __ add(kInterpreterRegisterFileRegister,
-         Immediate(InterpreterFrameConstants::kRegisterFilePointerFromFp));
+  __ mov(edx, ebp);
+  __ add(edx, Immediate(InterpreterFrameConstants::kRegisterFileFromFp));
   __ mov(kInterpreterBytecodeOffsetRegister,
          Immediate(BytecodeArray::kHeaderSize - kHeapObjectTag));
   __ mov(kInterpreterDispatchTableRegister,
          Immediate(ExternalReference::interpreter_dispatch_table_address(
              masm->isolate())));
 
   // Dispatch to the first bytecode handler for the function.
   __ movzx_b(ebx, Operand(kInterpreterBytecodeArrayRegister,
                           kInterpreterBytecodeOffsetRegister, times_1, 0));
   __ mov(ebx, Operand(kInterpreterDispatchTableRegister, ebx,
                       times_pointer_size, 0));
   __ call(ebx);
 
   // Even though the first bytecode handler was called, we will never return.
   __ Abort(kUnexpectedReturnFromBytecodeHandler);
 
   // Load debug copy of the bytecode array.
   __ bind(&load_debug_bytecode_array);
   Register debug_info = kInterpreterBytecodeArrayRegister;
   __ mov(debug_info, FieldOperand(eax, SharedFunctionInfo::kDebugInfoOffset));
   __ mov(kInterpreterBytecodeArrayRegister,
          FieldOperand(debug_info, DebugInfo::kAbstractCodeIndex));
   __ jmp(&bytecode_array_loaded);
 }
 
 
 void Builtins::Generate_InterpreterExitTrampoline(MacroAssembler* masm) {
-  // TODO(rmcilroy): List of things not currently dealt with here but done in
-  // fullcodegen's EmitReturnSequence.
-  //  - Supporting FLAG_trace for Runtime::TraceExit.
-  //  - Support profiler (specifically decrementing profiling_counter
-  //    appropriately and calling out to HandleInterrupts if necessary).
-
-  // The return value is in accumulator, which is already in rax.
+  // The return value is in accumulator, which is already in eax.
 
   // Leave the frame (also dropping the register file).
   __ leave();
 
   // Drop receiver + arguments and return.
   __ mov(ebx, FieldOperand(kInterpreterBytecodeArrayRegister,
                            BytecodeArray::kParameterSizeOffset));
   __ pop(ecx);
   __ add(esp, ebx);
   __ push(ecx);
@@ skipping 82 matching lines @@
 
   // Re-push return address.
   __ Push(ecx);
 
   // Call the constructor with unmodified eax, edi, ebi values.
   __ Jump(masm->isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
 }
 
 
 static void Generate_EnterBytecodeDispatch(MacroAssembler* masm) {
-  // Initialize register file register and dispatch table register.
-  __ mov(kInterpreterRegisterFileRegister, ebp);
-  __ add(kInterpreterRegisterFileRegister,
-         Immediate(InterpreterFrameConstants::kRegisterFilePointerFromFp));
+  // Initialize the dispatch table register.
   __ mov(kInterpreterDispatchTableRegister,
          Immediate(ExternalReference::interpreter_dispatch_table_address(
              masm->isolate())));
 
   // Get the bytecode array pointer from the frame.
   __ mov(kInterpreterBytecodeArrayRegister,
-         Operand(kInterpreterRegisterFileRegister,
-                 InterpreterFrameConstants::kBytecodeArrayFromRegisterPointer));
+         Operand(ebp, InterpreterFrameConstants::kBytecodeArrayFromFp));
 
   if (FLAG_debug_code) {
     // Check function data field is actually a BytecodeArray object.
     __ AssertNotSmi(kInterpreterBytecodeArrayRegister);
     __ CmpObjectType(kInterpreterBytecodeArrayRegister, BYTECODE_ARRAY_TYPE,
                      ebx);
     __ Assert(equal, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
   }
 
   // Get the target bytecode offset from the frame.
-  __ mov(
-      kInterpreterBytecodeOffsetRegister,
-      Operand(kInterpreterRegisterFileRegister,
-              InterpreterFrameConstants::kBytecodeOffsetFromRegisterPointer));
+  __ mov(kInterpreterBytecodeOffsetRegister,
+         Operand(ebp, InterpreterFrameConstants::kBytecodeOffsetFromFp));
   __ SmiUntag(kInterpreterBytecodeOffsetRegister);
 
   // Dispatch to the target bytecode.
   __ movzx_b(ebx, Operand(kInterpreterBytecodeArrayRegister,
                           kInterpreterBytecodeOffsetRegister, times_1, 0));
   __ mov(ebx, Operand(kInterpreterDispatchTableRegister, ebx,
                       times_pointer_size, 0));
   __ jmp(ebx);
 }
 
@@ skipping 2104 matching lines @@
   // And "return" to the OSR entry point of the function.
   __ ret(0);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87