public class LoopWhereIfIsExitNode extends AdHocUnitGraph {
/*
* +------+----+
* v | |
* -> if -> n2 |
* +---------> n1
* */
public final Unit n1 = j.newGotoStmt((Unit) null);
public final Unit n2 = j.newGotoStmt((Unit) null);
public final Unit nIf = j.newIfStmt(j.newEqExpr(IntConstant.v(0), IntConstant.v(0)), n1);
public LoopWhereIfIsExitNode() {
((GotoStmt) n1).setTarget(nIf);
((GotoStmt) n2).setTarget(nIf);
}
@Override
protected List<Unit> getUnits() {
return Arrays.asList(nIf, n1, n2);
}
@Override
public List<Unit> getHeads() {
return Collections.singletonList(nIf);
}
@Override
public List<Unit> getTails() {
return Collections.singletonList(nIf);
}
@Override
public List<Unit> getPredsOf(Unit unit) {
if (unit.equals(nIf)) {
return Collections.emptyList();
} else if (unit.equals(n1)) {
return Collections.singletonList(nIf);
} else if (unit.equals(n2)) {
return Collections.singletonList(nIf);
} else {
throw new RuntimeException("UNEXPECTED CASE");
}
}
@Override
public List<Unit> getSuccsOf(Unit unit) {
if (unit.equals(nIf)) {
return asList(n1, n2);
} else if (unit.equals(n1)) {
return Collections.singletonList(nIf);
} else if (unit.equals(n2)) {
return Collections.singletonList(nIf);
} else {
throw new RuntimeException("UNEXPECTED CASE");
}
}
}
public class LoopWithReflexivePostdom extends AdHocUnitGraph {
/*
* +-----------+
* v |
* -> if -> exit |
* +---------> n
* */
public final Unit nExit = j.newReturnStmt(IntConstant.v(42));
public final Unit nIf = j.newIfStmt(j.newEqExpr(IntConstant.v(0), IntConstant.v(0)), nExit);
public final Unit n = j.newGotoStmt(nIf);
@Override
protected List<Unit> getUnits() {
return Arrays.asList(nIf, n, nExit);
}
@Override
public List<Unit> getHeads() {
return Collections.singletonList(nIf);
}
@Override
public List<Unit> getTails() {
return Collections.singletonList(nExit);
}
@Override
public List<Unit> getPredsOf(Unit unit) {
if (unit.equals(nIf)) {
return Collections.emptyList();
} else if (unit.equals(nExit)) {
return Collections.singletonList(nIf);
} else if (unit.equals(n)) {
return Collections.singletonList(nIf);
} else {
throw new RuntimeException("UNEXPECTED CASE");
}
}
@Override
public List<Unit> getSuccsOf(Unit unit) {
if (unit.equals(nIf)) {
return asList(nExit, n);
} else if (unit.equals(nExit)) {
return Collections.emptyList();
} else if (unit.equals(n)) {
return Collections.singletonList(nIf);
} else {
throw new RuntimeException("UNEXPECTED CASE");
}
}
}
public class MultipleReturns extends AdHocForwardUnitGraph {
public final Unit returnX = j.newReturnStmt(localX);
public final Unit returnZ = j.newReturnStmt(localZ);
public final Unit ifY = j.newIfStmt(j.newEqExpr(localY, localY), returnX);
public final Unit ifO = j.newIfStmt(j.newEqExpr(localO, localO), ifY);
public final Unit returnZero = j.newReturnStmt(IntConstant.v(0));
public MultipleReturns() {
setForwardEdges(makeEdges(makeEdge(ifO, ifY, returnZ), makeEdge(ifY, returnX, returnZero)));
}
}