[all-commits] [llvm/llvm-project] 1e46eb: [Attributor][FIX] Avoid dangling value pointers du...

[Johannes Doerfert via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 1e46eb74be6527377e47090bbe0fc9298f7de2c5
      https://github.com/llvm/llvm-project/commit/1e46eb74be6527377e47090bbe0fc9298f7de2c5
  Author: Johannes Doerfert <johannes at jdoerfert.de>
  Date:   2020-01-08 (Wed, 08 Jan 2020)

  Changed paths:
    M llvm/include/llvm/IR/ValueHandle.h
    M llvm/include/llvm/Transforms/IPO/Attributor.h
    M llvm/lib/Transforms/IPO/Attributor.cpp
    M llvm/test/Transforms/Attributor/undefined_behavior.ll

  Log Message:
  -----------
  [Attributor][FIX] Avoid dangling value pointers during code modification

When we replace instructions with unreachable we delete instructions. We
now avoid dangling pointers to those deleted instructions in the
`ToBeChangedToUnreachableInsts` set. Other modification collections
might need to be updated in the future as well.