/**
* Inserts a new empty GOTO block as a predecessor to this block. All previous predecessors will
* be predecessors to the new block.
*
* @return {@code non-null;} an appropriately-constructed instance
*/
public SsaBasicBlock insertNewPredecessor() {
SsaBasicBlock newPred = parent.makeNewGotoBlock();
// Update the new block.
newPred.predecessors = predecessors;
newPred.successors.set(index);
newPred.successorList.add(index);
newPred.primarySuccessor = index;
// Update us.
predecessors = new BitSet(parent.getBlocks().size());
predecessors.set(newPred.index);
// Update our (soon-to-be) old predecessors.
for (int i = newPred.predecessors.nextSetBit(0);
i >= 0;
i = newPred.predecessors.nextSetBit(i + 1)) {
SsaBasicBlock predBlock = parent.getBlocks().get(i);
predBlock.replaceSuccessor(index, newPred.index);
}
return newPred;
}
/**
* Creates a new SSA basic block from a ROP form basic block.
*
* @param rmeth original method
* @param basicBlockIndex index this block will have
* @param parent method of this block predecessor set will be updated
* @return new instance
*/
public static SsaBasicBlock newFromRop(
RopMethod rmeth, int basicBlockIndex, final SsaMethod parent) {
BasicBlockList ropBlocks = rmeth.getBlocks();
BasicBlock bb = ropBlocks.get(basicBlockIndex);
SsaBasicBlock result = new SsaBasicBlock(basicBlockIndex, bb.getLabel(), parent);
InsnList ropInsns = bb.getInsns();
result.insns.ensureCapacity(ropInsns.size());
for (int i = 0, sz = ropInsns.size(); i < sz; i++) {
result.insns.add(new NormalSsaInsn(ropInsns.get(i), result));
}
result.predecessors =
SsaMethod.bitSetFromLabelList(ropBlocks, rmeth.labelToPredecessors(bb.getLabel()));
result.successors = SsaMethod.bitSetFromLabelList(ropBlocks, bb.getSuccessors());
result.successorList = SsaMethod.indexListFromLabelList(ropBlocks, bb.getSuccessors());
if (result.successorList.size() != 0) {
int primarySuccessor = bb.getPrimarySuccessor();
result.primarySuccessor =
(primarySuccessor < 0) ? -1 : ropBlocks.indexOfLabel(primarySuccessor);
}
return result;
}