[ignition] Add bytecodes for loads/stores in the current context

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 791 matching lines @@
   // 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* BytecodeGraphBuilder::BuildLoadCurrentContextSlot() {
+  // 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();
   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);
 }
 
+void BytecodeGraphBuilder::VisitStaCurrentContextSlot() {
+  const Operator* op =
+      javascript()->StoreContext(0, bytecode_iterator().GetIndexOperand(0));
+  Node* context = environment()->Context();
+  Node* value = environment()->LookupAccumulator();
+  NewNode(op, context, value);
+}
+
 void BytecodeGraphBuilder::BuildLdaLookupSlot(TypeofMode typeof_mode) {
   PrepareEagerCheckpoint();
   Node* name =
       jsgraph()->Constant(bytecode_iterator().GetConstantForIndexOperand(0));
   const Operator* op =
       javascript()->CallRuntime(typeof_mode == TypeofMode::NOT_INSIDE_TYPEOF
                                     ? Runtime::kLoadLookupSlot
                                     : Runtime::kLoadLookupSlotInsideTypeof);
   Node* value = NewNode(op, name);
   environment()->BindAccumulator(value, Environment::kAttachFrameState);
@@ skipping 1363 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