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[flang][OpenMP] Add semantic check for target update #71305

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Merged
merged 1 commit into from
Nov 6, 2023
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[flang][OpenMP] Add semantic check for target update #71305

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20 changes: 20 additions & 0 deletions flang/lib/Semantics/check-omp-structure.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1401,6 +1401,26 @@ void OmpStructureChecker::CheckTargetUpdate() {
context_.Say(GetContext().directiveSource,
"At least one motion-clause (TO/FROM) must be specified on TARGET UPDATE construct."_err_en_US);
}
if (toClause && fromClause) {
SymbolSourceMap toSymbols, fromSymbols;
GetSymbolsInObjectList(
std::get<parser::OmpClause::To>(toClause->u).v, toSymbols);
GetSymbolsInObjectList(
std::get<parser::OmpClause::From>(fromClause->u).v, fromSymbols);
for (auto &[symbol, source] : toSymbols) {
auto fromSymbol = fromSymbols.find(symbol);
if (fromSymbol != fromSymbols.end()) {
context_.Say(source,
"A list item ('%s') can only appear in a TO or FROM clause, but not in both."_err_en_US,
symbol->name());
context_.Say(source, "'%s' appears in the TO clause."_because_en_US,
symbol->name());
context_.Say(fromSymbol->second,
"'%s' appears in the FROM clause."_because_en_US,
fromSymbol->first->name());
}
}
}
}

void OmpStructureChecker::Enter(
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5 changes: 5 additions & 0 deletions flang/test/Semantics/OpenMP/target-update01.f90
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Expand Up @@ -13,4 +13,9 @@ subroutine foo(x)
!ERROR: At most one NOWAIT clause can appear on the TARGET UPDATE directive
!$omp target update to(x) nowait nowait

!ERROR: A list item ('x') can only appear in a TO or FROM clause, but not in both.
!BECAUSE: 'x' appears in the TO clause.
!BECAUSE: 'x' appears in the FROM clause.
!$omp target update to(x) from(x)

end subroutine