#include <map>
#include <set>
-#include "evaluate.h"
#include "visitor.h"
namespace Msp {
virtual void visit(Iteration &);
};
+/** Replaces expressions consisting entirely of literals with the results of
+evaluating the expression.*/
+class ConstantFolder: private TraversingVisitor
+{
+private:
+ VariableDeclaration *iteration_var;
+ Variant iter_init_value;
+ Variant r_constant_value;
+ bool iteration_init;
+ bool r_constant;
+ bool r_literal;
+ bool r_uses_iter_var;
+ bool r_any_folded;
+
+public:
+ bool apply(Stage &s) { s.content.visit(*this); return r_any_folded; }
+
+private:
+ static BasicTypeDeclaration::Kind get_value_kind(const Variant &);
+ template<typename T>
+ static T evaluate_logical(char, T, T);
+ template<typename T>
+ static bool evaluate_relation(const char *, T, T);
+ template<typename T>
+ static T evaluate_arithmetic(char, T, T);
+ void set_result(const Variant &, bool = false);
+
+ virtual void visit(RefPtr<Expression> &);
+ virtual void visit(Literal &);
+ virtual void visit(VariableReference &);
+ virtual void visit(MemberAccess &);
+ virtual void visit(Swizzle &);
+ virtual void visit(UnaryExpression &);
+ virtual void visit(BinaryExpression &);
+ virtual void visit(Assignment &);
+ virtual void visit(TernaryExpression &);
+ virtual void visit(FunctionCall &);
+ virtual void visit(VariableDeclaration &);
+ virtual void visit(Iteration &);
+};
+
/** Removes conditional statements and loops where the condition can be
determined as constant at compile time. */
class ConstantConditionEliminator: private TraversingVisitor
{
private:
+ enum ConstantStatus
+ {
+ CONSTANT_FALSE,
+ CONSTANT_TRUE,
+ NOT_CONSTANT
+ };
+
NodeList<Statement>::iterator insert_point;
std::set<Node *> nodes_to_remove;
void apply(Stage &);
private:
+ ConstantStatus check_constant_condition(const Expression &);
+
virtual void visit(Block &);
virtual void visit(Conditional &);
virtual void visit(Iteration &);