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Fix a pointer invalidation problem. This fixes Generic/badarg6.ll

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llvm-svn: 19361
This commit is contained in:
Chris Lattner 2005-01-07 23:32:00 +00:00
parent 53173ba1d1
commit 717236fcd3
1 changed files with 7 additions and 13 deletions
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20
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -191,29 +191,22 @@ void SelectionDAG::DeleteNodeIfDead(SDNode *N, void *NodeSet) {
}
// Next, brutally remove the operand list.
std::vector<SDNode*> Operands;
while (!N->Operands.empty()) {
SDOperand O = N->Operands.back();
SDNode *O = N->Operands.back().Val;
N->Operands.pop_back();
Operands.push_back(O.Val);
O.Val->removeUser(N);
O->removeUser(N);
// Now that we removed this operand, see if there are no uses of it left.
DeleteNodeIfDead(O, NodeSet);
}
// Remove the node from the nodes set and delete it.
std::set<SDNode*> &AllNodeSet = *(std::set<SDNode*>*)NodeSet;
AllNodeSet.erase(N);
delete N;
// Now that the node is gone, check to see if any of the operands of this node
// are dead now.
// Remove duplicate operand entries.
std::sort(Operands.begin(), Operands.end());
Operands.erase(std::unique(Operands.begin(), Operands.end()),
Operands.end());
for (unsigned i = 0, e = Operands.size(); i != e; ++i)
DeleteNodeIfDead(Operands[i], NodeSet);
delete N;
}
@ -733,6 +726,7 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
return getNode(ISD::BR, MVT::Other, N1, N3);
else
return N1; // Never-taken branch
break;
}
SDNode *N = new SDNode(Opcode, N1, N2, N3);