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[flang][OpenMP] Skip assertion while processing default clause on disallowed constructs #93438

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[flang][OpenMP] Skip assertion while processing default clause on disallowed constructs #93438

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[flang][OpenMP] Skip assertion while processing default clause on dis…
NimishMishra May 30, 2024
cac1cb5
Update ordered01.f90
NimishMishra Jan 23, 2025
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8 changes: 5 additions & 3 deletions flang/lib/Semantics/resolve-directives.cpp
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Expand Up @@ -2108,9 +2108,11 @@ void OmpAttributeVisitor::Post(const parser::Name &name) {
dirContext.defaultDSA == Symbol::Flag::OmpFirstPrivate ||
dirContext.defaultDSA == Symbol::Flag::OmpShared) {
// 1) default
// Allowed only with parallel, teams and task generating constructs.
assert(parallelDir || taskGenDir ||
llvm::omp::allTeamsSet.test(dirContext.directive));
// Allowed only with parallel, teams and task generating constructs,
// skip creating symbols thus.
if (!(parallelDir || taskGenDir ||
llvm::omp::allTeamsSet.test(dirContext.directive)))
return;
if (dirContext.defaultDSA != Symbol::Flag::OmpShared)
declNewSymbol(dirContext.defaultDSA);
else
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7 changes: 7 additions & 0 deletions flang/test/Semantics/OpenMP/ordered01.f90
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Expand Up @@ -7,6 +7,13 @@ program main
integer :: i, N = 10
real :: a, arrayA(10), arrayB(10), arrayC(10)
real, external :: foo, bar, baz

!ERROR: DEFAULT clause is not allowed on the DO directive
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The error message has to improve.

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@NimishMishra NimishMishra May 30, 2024 •
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This message is coming from CheckAllowed

llvm-project/flang/lib/Semantics/check-directive-structure.h

Line 487 in cd9a02e

void DirectiveStructureChecker<D, C, PC, ClauseEnumSize>::CheckAllowed(
. The message needs to be generic, since this is shared across different directives. Do you have anything specific in mind which we could add? Should we need something specific to default, then it would be better to resort to emitting the error at the position where the previous commit of this PR was doing.

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Sorry, I was a bit confused by the presence of ordered and was thinking this is a restriction only if ordered is present. I see that this is a general constraint for the DO directive, so it is fine.

!$omp do default(private)
do i = 1, N
arrayA(i) = arrayA(i) + 1
end do
!$omp end do

!$omp do ordered
do i = 1, N
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