[flang][runtime] Let more list-directed child input advance #160590
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akuhlens
reviewed
Sep 24, 2025
DanielCChen
approved these changes
Sep 25, 2025
Whether list-directed child READ statements should be allowed to advance to further records is neither explicit in the standard nor consistent in existing Fortran implementations. We allow child namelist READ statements to advance, but not other list- directed child input. This patch refines our interpretation of this case. Child namelist READ statements continue to be able to advance; in addition, non-namelist child READ statements can now advance if their parent READ statement is a list-directed input statement at the top level, or a child that could. But non-namelist list-directed child input taking place in a context with explicit format control won't advance to following records, so that the format-controlled parent READ statement can retain control over record advancement. Also corrects two cases of record repositioning in numeric input editing, which were failing under child input because they weren't allowing for left tab limits. Fixes llvm#160351.
eugeneepshteyn
approved these changes
Sep 25, 2025
mahesh-attarde
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Oct 3, 2025
) Whether list-directed child READ statements should be allowed to advance to further records is neither explicit in the standard nor consistent in existing Fortran implementations. We allow child namelist READ statements to advance, but not other list- directed child input. This patch refines our interpretation of this case. Child namelist READ statements continue to be able to advance; in addition, non-namelist child READ statements can now advance if their parent READ statement is a list-directed input statement at the top level, or a child that could. But non-namelist list-directed child input taking place in a context with explicit format control won't advance to following records, so that the format-controlled parent READ statement can retain control over record advancement. Also corrects two cases of record repositioning in numeric input editing, which were failing under child input because they weren't allowing for left tab limits. Fixes llvm#160351.
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Whether list-directed child READ statements should be allowed to advance to further records is neither explicit in the standard nor consistent in existing Fortran implementations. We allow child namelist READ statements to advance, but not other list- directed child input.
This patch refines our interpretation of this case. Child namelist READ statements continue to be able to advance; in addition, non-namelist child READ statements can now advance if their parent READ statement is a list-directed input statement at the top level, or a child that could. But non-namelist list-directed child input taking place in a context with explicit format control won't advance to following records, so that the format-controlled parent READ statement can retain control over record advancement.
Also corrects two cases of record repositioning in numeric input editing, which were failing under child input because they weren't allowing for left tab limits.
Fixes #160351.