[all-commits] [llvm/llvm-project] 319840: llvm-diff: Avoid crash with complex expressions

[Dominic Chen via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 31984063678ef523b940160ac9d49fcb87c1e2ac
      https://github.com/llvm/llvm-project/commit/31984063678ef523b940160ac9d49fcb87c1e2ac
  Author: Dominic Chen <d.c.ddcc at gmail.com>
  Date:   2020-05-21 (Thu, 21 May 2020)

  Changed paths:
    M llvm/tools/llvm-diff/DifferenceEngine.cpp

  Log Message:
  -----------
  llvm-diff: Avoid crash with complex expressions

Summary: With complex IR, the difference engine can enter an inconsistent state where the instruction and block difference engines return different results. Prevent a crash by refusing to pop beyond the end of the vector.

Reviewers: rjmccall

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D80351