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

src/compiler/bytecode-graph-builder.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/compiler/bytecode-graph-builder.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/compilation-info.h"
 #include "src/compiler/bytecode-branch-analysis.h"
@@ skipping 690 matching lines @@
   Node* node =
       jsgraph()->Constant(bytecode_iterator().GetConstantForIndexOperand(0));
   environment()->BindAccumulator(node);
 }
 
 void BytecodeGraphBuilder::VisitLdaUndefined() {
   Node* node = jsgraph()->UndefinedConstant();
   environment()->BindAccumulator(node);
 }
 
-void BytecodeGraphBuilder::VisitLdrUndefined() {
-  Node* node = jsgraph()->UndefinedConstant();
-  environment()->BindRegister(bytecode_iterator().GetRegisterOperand(0), node);
-}
-
 void BytecodeGraphBuilder::VisitLdaNull() {
   Node* node = jsgraph()->NullConstant();
   environment()->BindAccumulator(node);
 }
 
 void BytecodeGraphBuilder::VisitLdaTheHole() {
   Node* node = jsgraph()->TheHoleConstant();
   environment()->BindAccumulator(node);
 }
 
@@ skipping 34 matching lines @@
   return NewNode(op, GetFunctionClosure());
 }
 
 void BytecodeGraphBuilder::VisitLdaGlobal() {
   PrepareEagerCheckpoint();
   Node* node = BuildLoadGlobal(bytecode_iterator().GetIndexOperand(0),
                                TypeofMode::NOT_INSIDE_TYPEOF);
   environment()->BindAccumulator(node, Environment::kAttachFrameState);
 }
 
-void BytecodeGraphBuilder::VisitLdrGlobal() {
-  PrepareEagerCheckpoint();
-  Node* node = BuildLoadGlobal(bytecode_iterator().GetIndexOperand(0),
-                               TypeofMode::NOT_INSIDE_TYPEOF);
-  environment()->BindRegister(bytecode_iterator().GetRegisterOperand(1), node,
-                              Environment::kAttachFrameState);
-}
-
 void BytecodeGraphBuilder::VisitLdaGlobalInsideTypeof() {
   PrepareEagerCheckpoint();
   Node* node = BuildLoadGlobal(bytecode_iterator().GetIndexOperand(0),
                                TypeofMode::INSIDE_TYPEOF);
   environment()->BindAccumulator(node, Environment::kAttachFrameState);
 }
 
 void BytecodeGraphBuilder::BuildStoreGlobal(LanguageMode language_mode) {
   PrepareEagerCheckpoint();
   Handle<Name> name =
       Handle<Name>::cast(bytecode_iterator().GetConstantForIndexOperand(0));
   VectorSlotPair feedback =
       CreateVectorSlotPair(bytecode_iterator().GetIndexOperand(1));
   Node* value = environment()->LookupAccumulator();
 
   const Operator* op = javascript()->StoreGlobal(language_mode, name, feedback);
   Node* node = NewNode(op, value, GetFunctionClosure());
   environment()->RecordAfterState(node, Environment::kAttachFrameState);
 }
 
 void BytecodeGraphBuilder::VisitStaGlobalSloppy() {
   BuildStoreGlobal(LanguageMode::SLOPPY);
 }
 
 void BytecodeGraphBuilder::VisitStaGlobalStrict() {
   BuildStoreGlobal(LanguageMode::STRICT);
 }
 
-Node* BytecodeGraphBuilder::BuildLoadContextSlot() {
+void BytecodeGraphBuilder::VisitLdaContextSlot() {
   // TODO(mythria): immutable flag is also set to false. This information is not
   // available in bytecode array. update this code when the implementation
   // changes.
   const Operator* op = javascript()->LoadContext(
       bytecode_iterator().GetUnsignedImmediateOperand(2),
       bytecode_iterator().GetIndexOperand(1), false);
   Node* context =
       environment()->LookupRegister(bytecode_iterator().GetRegisterOperand(0));
-  return NewNode(op, context);
+  Node* node = NewNode(op, context);
+  environment()->BindAccumulator(node);
 }
 
-Node* BytecodeGraphBuilder::BuildLoadCurrentContextSlot() {
+void BytecodeGraphBuilder::VisitLdaCurrentContextSlot() {
   // TODO(mythria): immutable flag is also set to false. This information is not
   // available in bytecode array. update this code when the implementation
   // changes.
   const Operator* op = javascript()->LoadContext(
       0, bytecode_iterator().GetIndexOperand(0), false);
   Node* context = environment()->Context();
-  return NewNode(op, context);
-}
-
-void BytecodeGraphBuilder::VisitLdaContextSlot() {
-  Node* node = BuildLoadContextSlot();
+  Node* node = NewNode(op, context);
   environment()->BindAccumulator(node);
 }
 
-void BytecodeGraphBuilder::VisitLdaCurrentContextSlot() {
-  Node* node = BuildLoadCurrentContextSlot();
-  environment()->BindAccumulator(node);
-}
-
-void BytecodeGraphBuilder::VisitLdrContextSlot() {
-  Node* node = BuildLoadContextSlot();
-  environment()->BindRegister(bytecode_iterator().GetRegisterOperand(3), node);
-}
-
-void BytecodeGraphBuilder::VisitLdrCurrentContextSlot() {
-  Node* node = BuildLoadCurrentContextSlot();
-  environment()->BindRegister(bytecode_iterator().GetRegisterOperand(1), node);
-}
-
 void BytecodeGraphBuilder::VisitStaContextSlot() {
   const Operator* op = javascript()->StoreContext(
       bytecode_iterator().GetUnsignedImmediateOperand(2),
       bytecode_iterator().GetIndexOperand(1));
   Node* context =
       environment()->LookupRegister(bytecode_iterator().GetRegisterOperand(0));
   Node* value = environment()->LookupAccumulator();
   NewNode(op, context, value);
 }
 
@@ skipping 1379 matching lines @@
     source_positions_->set_current_position(it->source_position());
     it->Advance();
   } else {
     DCHECK_GT(it->code_offset(), offset);
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8