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Fix an out-of-bounds access in -view-sunit-dags in the case of an

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empty ScheduleDAG.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50054 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-04-21 20:07:30 +00:00
parent 0416b0a26d
commit 639cdc210b
1 changed files with 2 additions and 1 deletions
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3
lib/CodeGen/SelectionDAG/SelectionDAGPrinter.cpp
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@ -301,7 +301,8 @@ namespace llvm {
static void addCustomGraphFeatures(ScheduleDAG *G,
GraphWriter<ScheduleDAG*> &GW) {
GW.emitSimpleNode(0, "plaintext=circle", "GraphRoot");
if (G->DAG.getRoot().Val)
if (G->DAG.getRoot().Val &&
G->SUnitMap.find(G->DAG.getRoot().Val) != G->SUnitMap.end())
GW.emitEdge(0, -1, G->SUnitMap[G->DAG.getRoot().Val].front(), -1, "");
}
};