+ virtual void visit(Conditional &);
+ virtual void visit(Iteration &);
+ virtual void visit(Return &);
+};
+
+/** Inlines variables into expressions. Variables with trivial values (those
+consisting of a single literal or variable reference) are always inlined.
+Variables which are only referenced once are also inlined. */
+class ExpressionInliner: private TraversingVisitor
+{
+private:
+ struct ExpressionInfo
+ {
+ Expression *expression;
+ Block *assign_scope;
+ RefPtr<Expression> *inline_point;
+ const Operator *inner_oper;
+ const Operator *outer_oper;
+ bool inline_on_rhs;
+ bool trivial;
+ bool available;
+
+ ExpressionInfo();
+ };
+
+ std::map<VariableDeclaration *, ExpressionInfo> expressions;
+ ExpressionInfo *r_ref_info;
+ bool r_any_inlined;
+ bool r_trivial;
+ bool mutating;
+ bool iteration_init;
+ Block *iteration_body;
+ const Operator *r_oper;
+
+public:
+ ExpressionInliner();
+
+ bool apply(Stage &);
+
+private:
+ void visit_and_record(RefPtr<Expression> &, const Operator *, bool);
+ void inline_expression(Expression &, RefPtr<Expression> &, const Operator *, const Operator *, bool);
+ virtual void visit(Block &);
+ virtual void visit(VariableReference &);
+ virtual void visit(MemberAccess &);
+ virtual void visit(UnaryExpression &);
+ virtual void visit(BinaryExpression &);
+ virtual void visit(Assignment &);
+ virtual void visit(FunctionCall &);
+ virtual void visit(VariableDeclaration &);
+ virtual void visit(Conditional &);
+ virtual void visit(Iteration &);