[all-commits] [llvm/llvm-project] ce71f8: [flang] Fix crash on empty formatted external READs

[Peter Klausler via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ce71f8e01742598f9f0b563d259561e755e1cbce
      https://github.com/llvm/llvm-project/commit/ce71f8e01742598f9f0b563d259561e755e1cbce
  Author: peter klausler <pklausler at nvidia.com>
  Date:   2021-10-22 (Fri, 22 Oct 2021)

  Changed paths:
    M flang/runtime/io-stmt.cpp

  Log Message:
  -----------
  [flang] Fix crash on empty formatted external READs

ExternalFileUnit::BeginReadingRecord() must be called at least once
during an external formatted READ statement before FinishReadingRecord().
In the case of a formatted external READ with no data items, the call
to finish processing of the format (which might have lingering control
items that need doing) was taking place before the call to BeginReadingRecord
from ExternalIoStatementState::EndIoStatement.  Add a call to
BeginReadingRecord on this path.

Differential Revision: https://reviews.llvm.org/D112351