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Make ISelPosition a local variable.

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Now that multiple DAGUpdateListeners can be active at the same time,
ISelPosition can become a local variable in DoInstructionSelection.

We simply register an ISelUpdater with CurDAG while ISelPosition exists.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155249 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-04-20 22:08:50 +00:00
parent bc7d448f24
commit 8c48e4ff89
2 changed files with 25 additions and 36 deletions
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28
include/llvm/CodeGen/SelectionDAGISel.h
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@@ -172,49 +172,21 @@ protected:
///
unsigned DAGSize;
/// ISelPosition - Node iterator marking the current position of
/// instruction selection as it procedes through the topologically-sorted
/// node list.
SelectionDAG::allnodes_iterator ISelPosition;
/// ISelUpdater - helper class to handle updates of the
/// instruction selection graph.
class ISelUpdater : public SelectionDAG::DAGUpdateListener {
virtual void anchor();
SelectionDAG::allnodes_iterator &ISelPosition;
public:
ISelUpdater(SelectionDAG &DAG, SelectionDAG::allnodes_iterator &isp)
: SelectionDAG::DAGUpdateListener(DAG), ISelPosition(isp) {}
/// NodeDeleted - Handle nodes deleted from the graph. If the
/// node being deleted is the current ISelPosition node, update
/// ISelPosition.
///
virtual void NodeDeleted(SDNode *N, SDNode *E) {
if (ISelPosition == SelectionDAG::allnodes_iterator(N))
++ISelPosition;
}
};
/// ReplaceUses - replace all uses of the old node F with the use
/// of the new node T.
void ReplaceUses(SDValue F, SDValue T) {
ISelUpdater ISU(*CurDAG, ISelPosition);
CurDAG->ReplaceAllUsesOfValueWith(F, T);
}
/// ReplaceUses - replace all uses of the old nodes F with the use
/// of the new nodes T.
void ReplaceUses(const SDValue *F, const SDValue *T, unsigned Num) {
ISelUpdater ISU(*CurDAG, ISelPosition);
CurDAG->ReplaceAllUsesOfValuesWith(F, T, Num);
}
/// ReplaceUses - replace all uses of the old node F with the use
/// of the new node T.
void ReplaceUses(SDNode *F, SDNode *T) {
ISelUpdater ISU(*CurDAG, ISelPosition);
CurDAG->ReplaceAllUsesWith(F, T);
}