public override object VisitVariable_ID([NotNull] CMinusParser.Variable_IDContext context)
{
string variableName = context.ID().GetText();
int variableIndex = this.symbolTable.GetVariableIndex(variableName);
this.writer.WriteVariableAddress(variableName, variableIndex);
if (this.symbolTable.GetVariableScope(variableName) == 0)
{
this.writer.WriteProgramSize();
}
else
{
this.writer.WriteContextRegisterRead();
}
this.writer.WriteBinaryArithmeticExpression("+");
return(null);
}
public override object VisitVariable_ID([NotNull] CMinusParser.Variable_IDContext context)
{
string variableName = context.ID().GetText();
if (!this.symbolTable.HasSymbol(variableName))
{
this.EmitSemanticErrorMessage($"Variable {variableName} called but not declared", context);
return("error");
}
SymbolTable.Symbol foundSymbol = this.symbolTable.GetSymbol(variableName);
if (foundSymbol.construct == SymbolTable.Symbol.Construct.FUNCTION || foundSymbol.construct == SymbolTable.Symbol.Construct.ERROR)
{
this.EmitSemanticErrorMessage($"{variableName} used as a variable but declared as a {foundSymbol.construct}", context);
return("error");
}
return(foundSymbol.type);
}
