///
void eraseFromParent();
-
+ /// getSinglePredecessor - If this basic block has a single predecessor block,
+ /// return the block, otherwise return a null pointer.
+ BasicBlock *getSinglePredecessor();
+ const BasicBlock *getSinglePredecessor() const {
+ return const_cast<BasicBlock*>(this)->getSinglePredecessor();
+ }
//===--------------------------------------------------------------------===//
/// Instruction iterator methods
I->dropAllReferences();
}
+/// getSinglePredecessor - If this basic block has a single predecessor block,
+/// return the block, otherwise return a null pointer.
+BasicBlock *BasicBlock::getSinglePredecessor() {
+ pred_iterator PI = pred_begin(this), E = pred_end(this);
+ if (PI == E) return 0; // No preds.
+ BasicBlock *ThePred = *PI;
+ ++PI;
+ return (PI == E) ? ThePred : 0 /*multiple preds*/;
+}
+
// removePredecessor - This method is used to notify a BasicBlock that the
// specified Predecessor of the block is no longer able to reach it. This is
// actually not used to update the Predecessor list, but is actually used to