+ typedef std::map<ProgramSyntax::VariableDeclaration *, ProgramSyntax::Expression *> ValueMap;
+
+ const ValueMap *variable_values;
+ float result;
+ bool result_valid;
+
+ ExpressionEvaluator();
+ ExpressionEvaluator(const ValueMap &);
+
+ virtual void visit(ProgramSyntax::Literal &);
+ virtual void visit(ProgramSyntax::VariableReference &);
+ virtual void visit(ProgramSyntax::UnaryExpression &);
+ virtual void visit(ProgramSyntax::BinaryExpression &);
+ };
+
+ struct ConstantConditionEliminator: Visitor
+ {
+ unsigned scope_level;
+ ExpressionEvaluator::ValueMap variable_values;
+ bool remove_node;
+ ProgramSyntax::Block *replacement_block;
+
+ ConstantConditionEliminator();
+
+ virtual void visit(ProgramSyntax::Block &);
+ virtual void visit(ProgramSyntax::Assignment &);
+ virtual void visit(ProgramSyntax::VariableDeclaration &);
+ virtual void visit(ProgramSyntax::Conditional &);
+ virtual void visit(ProgramSyntax::Iteration &);
+ };
+
+ struct UnusedVariableLocator: Visitor
+ {
+ struct AssignmentList
+ {
+ std::vector<ProgramSyntax::Node *> nodes;
+ bool conditional;
+ bool self_referencing;
+ };
+
+ typedef std::set<ProgramSyntax::Node *> ResultType;
+ typedef std::map<ProgramSyntax::VariableDeclaration *, AssignmentList> BlockAssignmentMap;
+