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authorAlex Zinenko <zinenko@google.com>2022-05-25 15:57:22 +0200
committerAlex Zinenko <zinenko@google.com>2022-05-26 12:28:41 +0200
commit73c3dff1b3e42c278f4c675418b0cb5e8784174b (patch)
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[mlir] Use-after-free checker for the Transform dialect
The Transform dialect uses the side effect modeling mechanism to record the effects of the transform ops on the mapping between Transform IR values and Payload IR ops. Introduce a checker pass that warns if a Transform IR value is used after it has been freed (consumed). This pass is mostly intended as a debugging aid in addition to the verification/assertion mechanisms in the transform interpreter. It reports all potential use-after-free situations. The implementation makes a series of simplifying assumptions to be simple and conservative. A more advanced implementation would rely on the data flow-like analysis associated with a side-effect resource rather than a value, which is currently not supported by the analysis infrastructure. Reviewed By: springerm Differential Revision: https://reviews.llvm.org/D126381
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