[Interpreter] Add support for global declarations and load/store of global variables

src/interpreter/bytecode-generator.h

Index: src/interpreter/bytecode-generator.h
diff --git a/src/interpreter/bytecode-generator.h b/src/interpreter/bytecode-generator.h
index 99536c33fb52fbf8d092eaff624fdd936ee675e5..b1f11470bcdd7c75b2a4fbd6d9641493788a1efd 100644
--- a/src/interpreter/bytecode-generator.h
+++ b/src/interpreter/bytecode-generator.h
@@ -24,25 +24,35 @@ class BytecodeGenerator : public AstVisitor {
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
+  // Visiting function for declarations list is overridden.
+  void VisitDeclarations(ZoneList<Declaration*>* declarations) override;
+
  private:
   DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
 
   void VisitArithmeticExpression(BinaryOperation* binop);
   void VisitPropertyLoad(Register obj, Property* expr);
-  void VisitVariableLoad(Variable* variable);
+  void VisitVariableLoad(Variable* variable, FeedbackVectorICSlot slot);
+  void VisitVariableAssignment(Variable* variable, FeedbackVectorICSlot slot);
 
   inline BytecodeArrayBuilder& builder() { return builder_; }
   inline Scope* scope() const { return scope_; }
   inline void set_scope(Scope* scope) { scope_ = scope; }
   inline CompilationInfo* info() const { return info_; }
   inline void set_info(CompilationInfo* info) { info_ = info; }
+  ZoneVector<Handle<Object>>* globals() { return &globals_; }
 
   LanguageMode language_mode() const;
   int feedback_index(FeedbackVectorICSlot slot) const;
+  Register current_context() const;
 
   BytecodeArrayBuilder builder_;
   CompilationInfo* info_;
   Scope* scope_;
+  ZoneVector<Handle<Object>> globals_;
+
+  // TODO(rmcilroy): Encapsulate this in an environment object.
+  Register current_context_;
 };
 
 }  // namespace interpreter