[all-commits] [llvm/llvm-project] ec4ba0: [flang][runtime] Correct automatic parenthesized f...

[Peter Klausler via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ec4ba0f5fe83c0e90ae6a56ffd417a4603e71501
      https://github.com/llvm/llvm-project/commit/ec4ba0f5fe83c0e90ae6a56ffd417a4603e71501
  Author: Peter Klausler <35819229+klausler at users.noreply.github.com>
  Date:   2023-11-13 (Mon, 13 Nov 2023)

  Changed paths:
    M flang/runtime/format-implementation.h
    M flang/runtime/format.h
    M flang/unittests/Runtime/Format.cpp

  Log Message:
  -----------
  [flang][runtime] Correct automatic parenthesized format repetition case (#71436)

In Fortran, a format automatically repeats, with a line break, until all
the data items of a data transfer statement have been consumed. PRINT
"(3I4)", 1, 2, 3, 4, 5, 6 prints two lines, for example, three values
each.

When there are nested parentheses in a format, the rightmost set of
parentheses at the top level are used for automatic repetition. PRINT
"(I4,2(I4))" 1, 2, 3, 4, 5, 6, 7 print three lines, with three values on
the first and two each on the later ones.

Fix a bug in format interpretation that causes the detection of the
"rightmost" set of parentheses to take place on each pass, leading to
problems when parentheses are even further nested.