+ r_constant = false;
+}
+
+void ConstantFolder::visit(Swizzle &swizzle)
+{
+ TraversingVisitor::visit(swizzle);
+ r_constant = false;
+}
+
+void ConstantFolder::visit(UnaryExpression &unary)
+{
+ TraversingVisitor::visit(unary);
+ bool can_fold = r_constant;
+ r_constant = false;
+ if(!can_fold)
+ return;
+
+ char oper = unary.oper->token[0];
+ char oper2 = unary.oper->token[1];
+ if(oper=='!')
+ {
+ if(r_constant_value.check_type<bool>())
+ set_result(!r_constant_value.value<bool>());
+ }
+ else if(oper=='~')
+ {
+ if(r_constant_value.check_type<int>())
+ set_result(~r_constant_value.value<int>());
+ else if(r_constant_value.check_type<unsigned>())
+ set_result(~r_constant_value.value<unsigned>());
+ }
+ else if(oper=='-' && !oper2)
+ {
+ if(r_constant_value.check_type<int>())
+ set_result(-r_constant_value.value<int>());
+ else if(r_constant_value.check_type<unsigned>())
+ set_result(-r_constant_value.value<unsigned>());
+ else if(r_constant_value.check_type<float>())
+ set_result(-r_constant_value.value<float>());
+ }
+}
+
+void ConstantFolder::visit(BinaryExpression &binary)
+{
+ visit(binary.left);
+ bool left_constant = r_constant;
+ bool left_iter_var = r_uses_iter_var;
+ Variant left_value = r_constant_value;
+ visit(binary.right);
+ if(left_iter_var)
+ r_uses_iter_var = true;
+
+ bool can_fold = (left_constant && r_constant);
+ r_constant = false;
+ if(!can_fold)
+ return;
+
+ // Currently only expressions with both sides of equal types are handled.
+ if(!left_value.check_same_type(r_constant_value))
+ return;
+
+ char oper = binary.oper->token[0];
+ char oper2 = binary.oper->token[1];
+ if(oper=='&' || oper=='|' || oper=='^')
+ {
+ if(oper2==oper && left_value.check_type<bool>())
+ set_result(evaluate_logical(oper, left_value.value<bool>(), r_constant_value.value<bool>()));
+ else if(!oper2 && left_value.check_type<int>())
+ set_result(evaluate_logical(oper, left_value.value<int>(), r_constant_value.value<int>()));
+ else if(!oper2 && left_value.check_type<unsigned>())
+ set_result(evaluate_logical(oper, left_value.value<unsigned>(), r_constant_value.value<unsigned>()));
+ }
+ else if((oper=='<' || oper=='>') && oper2!=oper)
+ {
+ if(left_value.check_type<int>())
+ set_result(evaluate_relation(binary.oper->token, left_value.value<int>(), r_constant_value.value<int>()));
+ else if(left_value.check_type<unsigned>())
+ set_result(evaluate_relation(binary.oper->token, left_value.value<unsigned>(), r_constant_value.value<unsigned>()));
+ else if(left_value.check_type<float>())
+ set_result(evaluate_relation(binary.oper->token, left_value.value<float>(), r_constant_value.value<float>()));
+ }
+ else if((oper=='=' || oper=='!') && oper2=='=')
+ {
+ if(left_value.check_type<int>())
+ set_result((left_value.value<int>()==r_constant_value.value<int>()) == (oper=='='));
+ else if(left_value.check_type<unsigned>())
+ set_result((left_value.value<unsigned>()==r_constant_value.value<unsigned>()) == (oper=='='));
+ else if(left_value.check_type<float>())
+ set_result((left_value.value<float>()==r_constant_value.value<float>()) == (oper=='='));
+ }
+ else if(oper=='+' || oper=='-' || oper=='*' || oper=='/')
+ {
+ if(left_value.check_type<int>())
+ set_result(evaluate_arithmetic(oper, left_value.value<int>(), r_constant_value.value<int>()));
+ else if(left_value.check_type<unsigned>())
+ set_result(evaluate_arithmetic(oper, left_value.value<unsigned>(), r_constant_value.value<unsigned>()));
+ else if(left_value.check_type<float>())
+ set_result(evaluate_arithmetic(oper, left_value.value<float>(), r_constant_value.value<float>()));
+ }
+ else if(oper=='%' || ((oper=='<' || oper=='>') && oper2==oper))
+ {
+ if(left_value.check_type<int>())
+ set_result(evaluate_int_special_op(oper, left_value.value<int>(), r_constant_value.value<int>()));
+ else if(left_value.check_type<unsigned>())
+ set_result(evaluate_int_special_op(oper, left_value.value<unsigned>(), r_constant_value.value<unsigned>()));
+ }
+}
+
+void ConstantFolder::visit(Assignment &assign)
+{
+ TraversingVisitor::visit(assign);
+ r_constant = false;
+}
+
+void ConstantFolder::visit(TernaryExpression &ternary)
+{
+ TraversingVisitor::visit(ternary);
+ r_constant = false;
+}
+
+void ConstantFolder::visit(FunctionCall &call)
+{
+ if(call.constructor && call.type && call.arguments.size()==1)
+ {
+ const BasicTypeDeclaration *basic = dynamic_cast<const BasicTypeDeclaration *>(call.type);
+ if(basic)
+ {
+ visit(call.arguments[0]);
+ bool can_fold = r_constant;
+ r_constant = false;
+ if(!can_fold)
+ return;
+
+ if(basic->kind==BasicTypeDeclaration::BOOL)
+ convert_to_result<bool>(r_constant_value);
+ else if(basic->kind==BasicTypeDeclaration::INT && basic->size==32 && basic->sign)
+ convert_to_result<int>(r_constant_value);
+ else if(basic->kind==BasicTypeDeclaration::INT && basic->size==32 && !basic->sign)
+ convert_to_result<unsigned>(r_constant_value);
+ else if(basic->kind==BasicTypeDeclaration::FLOAT && basic->size==32)
+ convert_to_result<float>(r_constant_value);
+
+ return;
+ }
+ }
+
+ TraversingVisitor::visit(call);
+ r_constant = false;