https://bugs.llvm.org/show_bug.cgi?id=48117
Bug ID: 48117
Summary: A null pointer dereference error in
GIMatchTree::writeDOTGraphEdges
Product: tools
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: TableGen
Assignee: unassignedb...@nondot.org
Reporter: alansnape3...@gmail.com
CC: llvm-bugs@lists.llvm.org
According to the bug reports of my clang static analyzer fork, in class
`llvm::GIMatchTree`, if `Partitioner` is not set or set to nullptr, when
calling function `GIMatchTree::writeDOTGraph`, a null pointer dereference will
occur in function `GIMatchTree::writeDOTGraphEdges`.
1. call function GIMatchTree::writeDOTGraph:
llvm/utils/TableGen/GlobalISel/GIMatchTree.cpp:24
24 void GIMatchTree::writeDOTGraph(raw_ostream &OS) const {
2. call function GIMatchTree::writeDOTGraphNode:
llvm/utils/TableGen/GlobalISel/GIMatchTree.cpp:26
26 writeDOTGraphNode(OS);
3. assume `Partitioner` is null, take the false branch:
llvm/utils/TableGen/GlobalISel/GIMatchTree.cpp:32
32 if (Partitioner) {
4. assume `Partitioner` is null, take the false branch:
llvm/utils/TableGen/GlobalISel/GIMatchTree.cpp:48
48 if (!Partitioner && !IsFullyTraversed)
5. assume `Partitioner` is null, take the false branch:
llvm/utils/TableGen/GlobalISel/GIMatchTree.cpp:50
50 if (!Partitioner && !IsFullyTested) {
6. assume `Partitioner` is null, take the false branch:
llvm/utils/TableGen/GlobalISel/GIMatchTree.cpp:63
63 if (!Partitioner &&
7. call function GIMatchTree::writeDOTGraphEdges:
llvm/utils/TableGen/GlobalISel/GIMatchTree.cpp:69
69 writeDOTGraphEdges(OS);
8. dereference null smart pointer `Partitioner`:
llvm/utils/TableGen/GlobalISel/GIMatchTree.cpp:76
76 Partitioner->emitPartitionName(OS, Child.index());
Although the problem will not be triggered with the path presented, the problem
still worth noting.
See the attached HTML report for more details.
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