public override void CaseAIfThenElseStm(AIfThenElseStm node)
{
//Create graph node
Node graphNode = GetNode(node);
//Process inner if
node.GetThenBody().Apply(this);
node.GetElseBody().Apply(this);
//Add successor and predessors
PStm stm = GetFirst(node.GetThenBody());
if (stm != null)
{
graphNode.AddSucc(GetNode(stm));
}
stm = GetFirst(node.GetElseBody());
if (stm != null)
{
graphNode.AddSucc(GetNode(stm));
}
stm = GetNext(node);
if (stm != null)
{
Node nextGraphNode = GetNode(stm);
List <PStm> stms = GetLast(node.GetThenBody());
if (stms.Count > 0)
{
foreach (PStm pStm in stms)
{
nextGraphNode.AddPred(GetNode(pStm));
}
}
else
{
graphNode.AddSucc(nextGraphNode);
}
stms = GetLast(node.GetElseBody());
if (stms.Count > 0)
{
foreach (PStm pStm in stms)
{
nextGraphNode.AddPred(GetNode(pStm));
}
}
else
{
graphNode.AddSucc(nextGraphNode);
}
}
}
public override void CaseAIfThenElseStm(AIfThenElseStm node)
{
Write("if(");
node.GetCondition().Apply(this);
Write(")\n");
node.GetThenBody().Apply(this);
Write("else\n");
node.GetElseBody().Apply(this);
}
public override void OutAIfThenElseStm(AIfThenElseStm node)
{
bool value;
if (IsConst(node.GetCondition(), out value))
{
if (value)
{
node.ReplaceBy(node.GetThenBody());
}
else
{
node.ReplaceBy(node.GetElseBody());
}
changedSomething = true;
}
}
//Returns true if execution cannot continue after the stm
private bool removeDeadCode(PStm stm)
{
if (stm is ABreakStm || stm is AContinueStm || stm is AVoidReturnStm || stm is AValueReturnStm)
{
return(true);
}
if (stm is AIfThenStm)
{
AIfThenStm aStm = (AIfThenStm)stm;
bool stopped = removeDeadCode(aStm.GetBody());
if (IsBoolConst(aStm.GetCondition(), true))
{
return(stopped);
}
return(false);
}
if (stm is AIfThenElseStm)
{
AIfThenElseStm aStm = (AIfThenElseStm)stm;
bool stopped1 = removeDeadCode(aStm.GetThenBody());
if (IsBoolConst(aStm.GetCondition(), true))
{
return(stopped1);
}
bool stopped2 = removeDeadCode(aStm.GetElseBody());
if (IsBoolConst(aStm.GetCondition(), false))
{
return(stopped2);
}
return(stopped1 && stopped2);
}
if (stm is AWhileStm)
{
AWhileStm aStm = (AWhileStm)stm;
removeDeadCode(aStm.GetBody());
return(false);
}
if (stm is ABlockStm)
{
ABlockStm aStm = (ABlockStm)stm;
return(removeDeadCode((AABlock)aStm.GetBlock()));
}
return(false);
}
public override void CaseAIfThenElseStm(AIfThenElseStm node)
{
node.GetThenBody().Apply(this);
node.GetElseBody().Apply(this);
}
