[all-commits] [llvm/llvm-project] c4ede6: [DebugInfo][InstrRef] Avoid a crash during DBG_PHI...

[Jeremy Morse via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c4ede6d60892a5101d159b4876ad76fc8eefc837
      https://github.com/llvm/llvm-project/commit/c4ede6d60892a5101d159b4876ad76fc8eefc837
  Author: Jeremy Morse <jeremy.morse at sony.com>
  Date:   2021-10-18 (Mon, 18 Oct 2021)

  Changed paths:
    M llvm/include/llvm/CodeGen/MachineRegisterInfo.h
    M llvm/test/DebugInfo/ARM/machine-cp-updates-dbg-reg.mir

  Log Message:
  -----------
  [DebugInfo][InstrRef] Avoid a crash during DBG_PHI maintenence

With D110105, the isDebug flag for register uses is now a proxy for whether
the instruction is a debug instruction; that causes DBG_PHIs to have their
operands updated by calls to updateDbgUsersToReg, which is the correct
behaviour. However: that function only expects to receive DBG_VALUE
instructions and asserts such.

This patch splits the updating-action into a lambda, and applies it to the
appropriate operands for each kind of debug instruction. Tested with an
ARM test that stimulates this function: I've added some DBG_PHI
instructions that should be updated in the same way as DBG_VALUEs.

Differential Revision: https://reviews.llvm.org/D108641