void IfHeader()
{
Expect((int)TokenEnum.If);
Expect((int)TokenEnum.LeftParenthesis);
Expression();
try {
GraphicFooType type = Quadruple.typeStack.Pop();
if (Semantics.ExpectType(type, GraphicFooType.Boolean))
{
string id = Quadruple.operandStack.Pop();
Quadruple.CreateGotoFalseQuadruple(id);
Quadruple.PushJump();
}
else
{
SemErr(
(int)SemanticEnum.TypeMismatch,
"expected boolean, found " + type
);
}
} catch (InvalidOperationException) {
SynErr((int)TokenEnum.NoExpression);
}
Expect((int)TokenEnum.RightParenthesis);
}
/// <summary>
/// Creates a return quadruple.
/// </summary>
/// <returns>The return quadruple.</returns>
/// <param name="id">Identifier.</param>
public static SemanticEnum CreateReturnQuadruple(string id)
{
Variable returnVariable = null;
if (id != "")
{
returnVariable = ProgramMemory.FindVariable(scope, id);
}
// Validate return type
SemanticEnum returnStatus = Semantics.ValidateReturn(scope.type, returnVariable);
if (returnStatus == SemanticEnum.ValidReturn)
{
scope.SetEnd(Quadruple.quadruples.Count);
Quadruple quadruple =
new Quadruple(Operators.Return, returnVariable);
PushQuadruple(quadruple);
}
return(returnStatus);
}