[all-commits] [llvm/llvm-project] d77124: [flang] Fix READ/WRITE with POS= on stream units, ...

[Peter Klausler via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d771245a9dd81c374e7ff34581a2f7adaf74fc38
      https://github.com/llvm/llvm-project/commit/d771245a9dd81c374e7ff34581a2f7adaf74fc38
  Author: Peter Klausler <pklausler at nvidia.com>
  Date:   2022-06-23 (Thu, 23 Jun 2022)

  Changed paths:
    M flang/runtime/io-api.cpp
    M flang/runtime/unit.cpp
    M flang/runtime/unit.h

  Log Message:
  -----------
  [flang] Fix READ/WRITE with POS= on stream units, with refactoring

First, ExternalFileUnit::SetPosition was being used both as a utility
within the class' member functions as well as an API from I/O statement
processing.  Make it private, and add APIs for SetStreamPos and SetDirectRec.

Second, ensure that SetStreamPos for POS= positioning in a stream
doesn't leave the current record number and endfile record number
in an arbitrary state.  In stream I/O they are used only to manage
end-of-file detection, and shouldn't produce false positive results
from IsAtEnd() after repositioning.

Differential Revision: https://reviews.llvm.org/D128388