public bool BeginsCatch(BasicBlock bb)
{
ExceptionHandler handler = printer.StartsHandlerRegion (bb.FirstInstruction);
if (handler != null && handler.Type == ExceptionHandlerType.Catch)
return true;
return false;
}
private void BuildGraph() {
BasicBlock tail = null;
Instruction prevInsn = null;
BasicBlock prevBB = null;
int currentInsnNum = 0;
Hashtable insnBB = new Hashtable();
BasicBlock exit = new BasicBlock(instructions);
exit.first = exit.last = 0;
exit.isExit = true;
AddNode(exit);
foreach(Instruction insn in instructions) {
if (printer.IsLeader (insn, prevInsn)) {
tail = new BasicBlock(instructions);
tail.first = currentInsnNum;
AddNode(tail);
if(prevBB != null) {
prevBB.last = currentInsnNum - 1;
if(HasNext(instructions[currentInsnNum - 1])) {
CFGEdge edge = new CFGEdge(prevBB, tail,
CFGEdgeType.Forward);
AddEdge(edge);
}
}
}
insnBB.Add(insn.Offset, tail);
prevInsn = insn;
prevBB = tail;
currentInsnNum++;
}
if(prevBB != null) {
prevBB.last = currentInsnNum - 1;
}
foreach(Instruction insn in instructions) {
if ((printer.EndsTryRegion (insn) != null) ||
(printer.EndsHandlerRegion (insn) != null)) {
BasicBlock finallyBB = GetNearestFinally(insn, insnBB);
if(finallyBB != null)
AddEdge(new CFGEdge((BasicBlock)insnBB[insn.Offset],
finallyBB, CFGEdgeType.Forward));
}
if(insn.OpCode.FlowControl == FlowControl.Return) {
if(insn.OpCode.Code == Code.Endfinally &&
insn.Next != null) {
AddEdge(new CFGEdge((BasicBlock)insnBB[insn.Offset],
(BasicBlock)insnBB[insn.Next.Offset],
CFGEdgeType.Forward));
} else {
AddEdge(new CFGEdge((BasicBlock)insnBB[insn.Offset],
exit, CFGEdgeType.Return));
}
}
/*
if((insn.OpCode.Value != OpCodeConstants.Leave) &&
(insn.OpCode.Value != OpCodeConstants.Endfinally)) {
*/
int[] targets = MethodPrinter.BranchTargets (insn);
if(targets == null)
continue;
foreach(int target in targets) {
AddEdge(new CFGEdge((BasicBlock)insnBB[insn.Offset],
(BasicBlock)insnBB[target],
CFGEdgeType.Branch));
}
/*} */
}
entryPoint = (BasicBlock)insnBB[0];
}
