[Interpreter] Remove all Ldr style bytecodes and replace with Star lookahead.

src/interpreter/interpreter.cc

 // Copyright 2015 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.
 
 #include "src/interpreter/interpreter.h"
 
 #include <fstream>
 #include <memory>
 
 #include "src/ast/prettyprinter.h"
@@ skipping 334 matching lines @@
 // LdaUndefined
 //
 // Load Undefined into the accumulator.
 void Interpreter::DoLdaUndefined(InterpreterAssembler* assembler) {
   Node* undefined_value =
       __ HeapConstant(isolate_->factory()->undefined_value());
   __ SetAccumulator(undefined_value);
   __ Dispatch();
 }
 
-// LdrUndefined <reg>
-//
-// Loads undefined into the accumulator and |reg|.
-void Interpreter::DoLdrUndefined(InterpreterAssembler* assembler) {
-  Node* undefined_value =
-      __ HeapConstant(isolate_->factory()->undefined_value());
-  Node* destination = __ BytecodeOperandReg(0);
-  __ StoreRegister(undefined_value, destination);
-  __ Dispatch();
-}
-
 // LdaNull
 //
 // Load Null into the accumulator.
 void Interpreter::DoLdaNull(InterpreterAssembler* assembler) {
   Node* null_value = __ HeapConstant(isolate_->factory()->null_value());
   __ SetAccumulator(null_value);
   __ Dispatch();
 }
 
 // LdaTheHole
@@ skipping 77 matching lines @@
       CodeFactory::LoadGlobalICInOptimizedCode(isolate_, NOT_INSIDE_TYPEOF);
 
   Node* context = __ GetContext();
 
   Node* raw_slot = __ BytecodeOperandIdx(0);
   Node* result = BuildLoadGlobal(ic, context, raw_slot, assembler);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
-// LdrGlobal <slot> <reg>
-//
-// Load the global with name in constant pool entry <name_index> into
-// register <reg> using FeedBackVector slot <slot> outside of a typeof.
-void Interpreter::DoLdrGlobal(InterpreterAssembler* assembler) {
-  Callable ic =
-      CodeFactory::LoadGlobalICInOptimizedCode(isolate_, NOT_INSIDE_TYPEOF);
-
-  Node* context = __ GetContext();
-
-  Node* raw_slot = __ BytecodeOperandIdx(0);
-  Node* result = BuildLoadGlobal(ic, context, raw_slot, assembler);
-  Node* destination = __ BytecodeOperandReg(1);
-  __ StoreRegister(result, destination);
-  __ Dispatch();
-}
-
 // LdaGlobalInsideTypeof <slot>
 //
 // Load the global with name in constant pool entry <name_index> into the
 // accumulator using FeedBackVector slot <slot> inside of a typeof.
 void Interpreter::DoLdaGlobalInsideTypeof(InterpreterAssembler* assembler) {
   Callable ic =
       CodeFactory::LoadGlobalICInOptimizedCode(isolate_, INSIDE_TYPEOF);
 
   Node* context = __ GetContext();
 
@@ skipping 37 matching lines @@
 
 // StaGlobalStrict <name_index> <slot>
 //
 // Store the value in the accumulator into the global with name in constant pool
 // entry <name_index> using FeedBackVector slot <slot> in strict mode.
 void Interpreter::DoStaGlobalStrict(InterpreterAssembler* assembler) {
   Callable ic = CodeFactory::StoreICInOptimizedCode(isolate_, STRICT);
   DoStaGlobal(ic, assembler);
 }
 
-compiler::Node* Interpreter::BuildLoadContextSlot(
-    InterpreterAssembler* assembler) {
-  Node* reg_index = __ BytecodeOperandReg(0);
-  Node* context = __ LoadRegister(reg_index);
-  Node* slot_index = __ BytecodeOperandIdx(1);
-  Node* depth = __ BytecodeOperandUImm(2);
-  Node* slot_context = __ GetContextAtDepth(context, depth);
-  return __ LoadContextElement(slot_context, slot_index);
-}
-
-compiler::Node* Interpreter::BuildLoadCurrentContextSlot(
-    InterpreterAssembler* assembler) {
-  Node* slot_index = __ BytecodeOperandIdx(0);
-  Node* slot_context = __ GetContext();
-  return __ LoadContextElement(slot_context, slot_index);
-}
-
 // LdaContextSlot <context> <slot_index> <depth>
 //
 // Load the object in |slot_index| of the context at |depth| in the context
 // chain starting at |context| into the accumulator.
 void Interpreter::DoLdaContextSlot(InterpreterAssembler* assembler) {
-  Node* result = BuildLoadContextSlot(assembler);
+  Node* reg_index = __ BytecodeOperandReg(0);
+  Node* context = __ LoadRegister(reg_index);
+  Node* slot_index = __ BytecodeOperandIdx(1);
+  Node* depth = __ BytecodeOperandUImm(2);
+  Node* slot_context = __ GetContextAtDepth(context, depth);
+  Node* result = __ LoadContextElement(slot_context, slot_index);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
 // LdaCurrentContextSlot <slot_index>
 //
 // Load the object in |slot_index| of the current context into the accumulator.
 void Interpreter::DoLdaCurrentContextSlot(InterpreterAssembler* assembler) {
-  Node* result = BuildLoadCurrentContextSlot(assembler);
+  Node* slot_index = __ BytecodeOperandIdx(0);
+  Node* slot_context = __ GetContext();
+  Node* result = __ LoadContextElement(slot_context, slot_index);
   __ SetAccumulator(result);
   __ Dispatch();
 }
 
-// LdrContextSlot <context> <slot_index> <depth> <reg>
-//
-// Load the object in |slot_index| of the context at |depth| in the context
-// chain of |context| into register |reg|.
-void Interpreter::DoLdrContextSlot(InterpreterAssembler* assembler) {
-  Node* result = BuildLoadContextSlot(assembler);
-  Node* destination = __ BytecodeOperandReg(3);
-  __ StoreRegister(result, destination);
-  __ Dispatch();
-}
-
-// LdrCurrentContextSlot <slot_index> <reg>
-//
-// Load the object in |slot_index| of the current context into register |reg|.
-void Interpreter::DoLdrCurrentContextSlot(InterpreterAssembler* assembler) {
-  Node* result = BuildLoadCurrentContextSlot(assembler);
-  Node* destination = __ BytecodeOperandReg(1);
-  __ StoreRegister(result, destination);
-  __ Dispatch();
-}
-
 // StaContextSlot <context> <slot_index> <depth>
 //
 // Stores the object in the accumulator into |slot_index| of the context at
 // |depth| in the context chain starting at |context|.
 void Interpreter::DoStaContextSlot(InterpreterAssembler* assembler) {
   Node* value = __ GetAccumulator();
   Node* reg_index = __ BytecodeOperandReg(0);
   Node* context = __ LoadRegister(reg_index);
   Node* slot_index = __ BytecodeOperandIdx(1);
   Node* depth = __ BytecodeOperandUImm(2);
@@ skipping 2138 matching lines @@
   __ StoreObjectField(generator, JSGeneratorObject::kContinuationOffset,
       __ SmiTag(new_state));
   __ SetAccumulator(old_state);
 
   __ Dispatch();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8