int CFAnalyzer::reduceBlockBeginNodes(Flow& flow) {
LabelSet labs=flow.nodeLabels();
int cnt=0;
for(LabelSet::iterator i=labs.begin();i!=labs.end();++i) {
if(isSgBasicBlock(getNode(*i))) {
cnt++;
Flow inFlow=flow.inEdges(*i);
Flow outFlow=flow.outEdges(*i);
// multiple out-edges not supported yet
assert(outFlow.size()<=1);
/* description of essential operations:
* inedges: (n_i,b)
* outedge: (b,n2)
* remove(n_i,b)
* remove(b,n2)
* insert(n1,n2)
*/
for(Flow::iterator initer=inFlow.begin();initer!=inFlow.end();++initer) {
Edge e1=*initer;
Edge e2=*outFlow.begin();
Edge newEdge=Edge(e1.source,e1.types(),e2.target);
flow.erase(e1);
flow.erase(e2);
flow.insert(newEdge);
}
}
}
return cnt;
}
int CFAnalysis::reduceNode(Flow& flow, Label lab) {
Flow inFlow=flow.inEdges(lab);
Flow outFlow=flow.outEdges(lab);
/* description of essential operations:
* inedges: (n_i,b)
* outedge: (b,n2)
* remove(n_i,b)
* remove(b,n2)
* insert(n1,n2)
*/
if(inFlow.size()==0 && outFlow.size()==0)
return 0;
if(inFlow.size()==0 || outFlow.size()==0) {
Flow edges=inFlow+outFlow;
flow.deleteEdges(edges);
return 1;
}
for(Flow::iterator initer=inFlow.begin();initer!=inFlow.end();++initer) {
for(Flow::iterator outiter=outFlow.begin();outiter!=outFlow.end();++outiter) {
Edge e1=*initer;
Edge e2=*outiter;
Edge newEdge=Edge(e1.source,e1.types(),e2.target);
flow.erase(e1);
flow.erase(e2);
flow.insert(newEdge);
}
}
return 1;
}
int CFAnalysis::reduceBlockBeginNodes(Flow& flow) {
LabelSet labs=flow.nodeLabels();
int cnt=0;
for(LabelSet::iterator i=labs.begin();i!=labs.end();++i) {
//cout<<"Checking label: "<<(*i)<<" node: "<<getNode(*i)<<" code:"<<getNode(*i)->unparseToString()<<endl;
if(isSgBasicBlock(getNode(*i))) {
#if 1
cnt+=reduceNode(flow,*i);
#else
cnt++;
Flow inFlow=flow.inEdges(*i);
Flow outFlow=flow.outEdges(*i);
// multiple out-edges not supported yet
assert(outFlow.size()<=1);
/* description of essential operations:
* inedges: (n_i,b)
* outedge: (b,n2)
* remove(n_i,b)
* remove(b,n2)
* insert(n1,n2)
*/
for(Flow::iterator initer=inFlow.begin();initer!=inFlow.end();++initer) {
Edge e1=*initer;
Edge e2=*outFlow.begin();
Edge newEdge=Edge(e1.source,e1.types(),e2.target);
flow.erase(e1);
flow.erase(e2);
flow.insert(newEdge);
}
#endif
}
}
return cnt;
}
int CFAnalysis::reduceNode(Flow& flow, Label lab) {
Flow inFlow=flow.inEdges(lab);
Flow outFlow=flow.outEdges(lab);
// edge type cleanup
// if true and false edge exist, remove both (merging true and false branches to a single branch)
// if forward and backward exist, remove forward (we are not removing the cycle)
/* description of essential operations:
* inedges: (n_i,b)
* outedge: (b,n2)
* remove(n_i,b)
* remove(b,n2)
* insert(n1,n2)
*/
if(inFlow.size()==0 && outFlow.size()==0) {
return 0;
} else if(inFlow.size()>0 && outFlow.size()>0) {
set<Edge> toErase;
set<Edge> toInsert;
for(Flow::iterator initer=inFlow.begin();initer!=inFlow.end();++initer) {
for(Flow::iterator outiter=outFlow.begin();outiter!=outFlow.end();++outiter) {
Edge e1=*initer;
Edge e2=*outiter;
// preserve edge annotations of ingoing and outgoing edges
EdgeTypeSet unionEdgeTypeSet;
EdgeTypeSet edgeTypeSet1=(*initer).types();
unionEdgeTypeSet.insert(edgeTypeSet1.begin(),edgeTypeSet1.end());
EdgeTypeSet edgeTypeSet2=(*outiter).types();
// only copy an edge annotation in the outgoing edge if it is
// not a true-annotation or a false-annotation
for(EdgeTypeSet::iterator i=edgeTypeSet2.begin();i!=edgeTypeSet2.end();++i) {
if(*i!=EDGE_TRUE && *i!=EDGE_FALSE) {
unionEdgeTypeSet.insert(*i);
}
}
if(unionEdgeTypeSet.find(EDGE_TRUE)!=unionEdgeTypeSet.end()
&& unionEdgeTypeSet.find(EDGE_FALSE)!=unionEdgeTypeSet.end()) {
unionEdgeTypeSet.erase(EDGE_TRUE);
unionEdgeTypeSet.erase(EDGE_FALSE);
}
if(unionEdgeTypeSet.find(EDGE_FORWARD)!=unionEdgeTypeSet.end()
&& unionEdgeTypeSet.find(EDGE_BACKWARD)!=unionEdgeTypeSet.end()) {
unionEdgeTypeSet.erase(EDGE_FORWARD);
// keep backward edge annotation
}
Edge newEdge=Edge(e1.source(),unionEdgeTypeSet,e2.target());
toErase.insert(e1);
toErase.insert(e2);
if(e1.source()!=e2.target()) {
toInsert.insert(newEdge);
}
}
}
for(set<Edge>::iterator i=toErase.begin();i!=toErase.end();++i) {
flow.erase(*i);
}
for(set<Edge>::iterator i=toInsert.begin();i!=toInsert.end();++i) {
flow.insert(*i);
}
return 1;
} else if(inFlow.size()>0) {
for(Flow::iterator initer=inFlow.begin();initer!=inFlow.end();++initer) {
Edge e1=*initer;
flow.erase(e1);
}
return 1;
} else if(outFlow.size()>0) {
for(Flow::iterator outiter=outFlow.begin();outiter!=outFlow.end();++outiter) {
Edge e2=*outiter;
flow.erase(e2);
}
return 1;
}
return 0;
}
int CFAnalysis::reduceNode(Flow& flow, Label lab) {
Flow inFlow=flow.inEdges(lab);
Flow outFlow=flow.outEdges(lab);
EdgeTypeSet unionEdgeTypeSets;
for(Flow::iterator i=inFlow.begin();i!=inFlow.end();++i) {
EdgeTypeSet edgeTypeSet=(*i).types();
unionEdgeTypeSets.insert(edgeTypeSet.begin(),edgeTypeSet.end());
}
for(Flow::iterator i=outFlow.begin();i!=outFlow.end();++i) {
EdgeTypeSet edgeTypeSet=(*i).types();
unionEdgeTypeSets.insert(edgeTypeSet.begin(),edgeTypeSet.end());
}
// edge type cleanup
// if true and false edge exist, remove both (merging true and false branches to a single branch)
// if forward and backward exist, remove backward (we are removing a cycle)
if(unionEdgeTypeSets.find(EDGE_TRUE)!=unionEdgeTypeSets.end()
&& unionEdgeTypeSets.find(EDGE_FALSE)!=unionEdgeTypeSets.end()) {
unionEdgeTypeSets.erase(EDGE_TRUE);
unionEdgeTypeSets.erase(EDGE_FALSE);
}
if(unionEdgeTypeSets.find(EDGE_FORWARD)!=unionEdgeTypeSets.end()
&& unionEdgeTypeSets.find(EDGE_BACKWARD)!=unionEdgeTypeSets.end()) {
unionEdgeTypeSets.erase(EDGE_FORWARD);
unionEdgeTypeSets.erase(EDGE_BACKWARD);
}
/* description of essential operations:
* inedges: (n_i,b)
* outedge: (b,n2)
* remove(n_i,b)
* remove(b,n2)
* insert(n1,n2)
*/
if(inFlow.size()==0 && outFlow.size()==0) {
return 0;
} else if(inFlow.size()>0 && outFlow.size()>0) {
for(Flow::iterator initer=inFlow.begin();initer!=inFlow.end();++initer) {
for(Flow::iterator outiter=outFlow.begin();outiter!=outFlow.end();++outiter) {
Edge e1=*initer;
Edge e2=*outiter;
// preserve edge annotations of ingoing and outgoing edges
Edge newEdge=Edge(e1.source,unionEdgeTypeSets,e2.target);
flow.erase(e1);
flow.erase(e2);
flow.insert(newEdge);
}
return 1;
}
} else if(inFlow.size()>0) {
for(Flow::iterator initer=inFlow.begin();initer!=inFlow.end();++initer) {
Edge e1=*initer;
flow.erase(e1);
}
return 1;
} else if(outFlow.size()>0) {
for(Flow::iterator outiter=outFlow.begin();outiter!=outFlow.end();++outiter) {
Edge e2=*outiter;
flow.erase(e2);
}
return 1;
}
return 0;
}