1b3a1db19f
Once defined, a stack slot holding an open-coded defer arg should always be marked live, since it may be used at any time if there is a panic. These stack slots are typically kept live naturally by the open-defer code inlined at each return/exit point. However, we need to do extra work to make sure that they are kept live if a function has an infinite loop or a panic exit. For this fix, only in the case of a function that is using open-coded defers, we compute the set of blocks (most often empty) that cannot reach a return or a BlockExit (panic) because of an infinite loop. Then, for each block b which cannot reach a return or BlockExit or is a BlockExit block, we mark each defer arg slot as live, as long as the definition of the defer arg slot dominates block b. For this change, had to export (*Func).sdom (-> Sdom) and SparseTree.isAncestorEq (-> IsAncestorEq) Updates #35277 Change-Id: I7b53c9bd38ba384a3794386dd0eb94e4cbde4eb1 Reviewed-on: https://go-review.googlesource.com/c/go/+/204802 Run-TryBot: Dan Scales <danscales@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> |
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