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[OpenMP] atomic compare weak : Parser & AST support (#79475)
This is a support for " #pragma omp atomic compare weak". It has Parser & AST support for now. --------- Authored-by: Sunil Kuravinakop <[email protected]>
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17 files changed

+128
-3
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‎clang/include/clang/AST/OpenMPClause.h

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@@ -2513,6 +2513,46 @@ class OMPRelaxedClause final : public OMPClause {
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}
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};
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/// This represents 'weak' clause in the '#pragma omp atomic'
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/// directives.
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///
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/// \code
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/// #pragma omp atomic compare weak
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/// \endcode
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/// In this example directive '#pragma omp atomic' has 'weak' clause.
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class OMPWeakClause final : public OMPClause {
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public:
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/// Build 'weak' clause.
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///
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/// \param StartLoc Starting location of the clause.
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/// \param EndLoc Ending location of the clause.
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OMPWeakClause(SourceLocation StartLoc, SourceLocation EndLoc)
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: OMPClause(llvm::omp::OMPC_weak, StartLoc, EndLoc) {}
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/// Build an empty clause.
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OMPWeakClause()
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: OMPClause(llvm::omp::OMPC_weak, SourceLocation(), SourceLocation()) {}
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child_range children() {
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return child_range(child_iterator(), child_iterator());
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}
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const_child_range children() const {
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return const_child_range(const_child_iterator(), const_child_iterator());
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}
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child_range used_children() {
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return child_range(child_iterator(), child_iterator());
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}
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const_child_range used_children() const {
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return const_child_range(const_child_iterator(), const_child_iterator());
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}
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static bool classof(const OMPClause *T) {
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return T->getClauseKind() == llvm::omp::OMPC_weak;
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}
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};
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/// This represents 'fail' clause in the '#pragma omp atomic'
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/// directive.
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///

‎clang/include/clang/AST/RecursiveASTVisitor.h

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@@ -3436,6 +3436,11 @@ bool RecursiveASTVisitor<Derived>::VisitOMPRelaxedClause(OMPRelaxedClause *) {
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return true;
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}
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template <typename Derived>
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bool RecursiveASTVisitor<Derived>::VisitOMPWeakClause(OMPWeakClause *) {
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return true;
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}
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template <typename Derived>
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bool RecursiveASTVisitor<Derived>::VisitOMPThreadsClause(OMPThreadsClause *) {
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return true;

‎clang/include/clang/Basic/DiagnosticSemaKinds.td

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -11042,7 +11042,8 @@ def note_omp_atomic_compare: Note<
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"expect lvalue for result value|expect scalar value|expect integer value|unexpected 'else' statement|expect '==' operator|expect an assignment statement 'v = x'|"
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"expect a 'if' statement|expect no more than two statements|expect a compound statement|expect 'else' statement|expect a form 'r = x == e; if (r) ...'}0">;
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def err_omp_atomic_fail_wrong_or_no_clauses : Error<"expected a memory order clause">;
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def err_omp_atomic_fail_no_compare : Error<"expected 'compare' clause with the 'fail' modifier">;
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def err_omp_atomic_no_compare : Error<"expected 'compare' clause with the '%0' modifier">;
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def err_omp_atomic_weak_no_equality : Error<"expected '==' operator for 'weak' clause">;
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def err_omp_atomic_several_clauses : Error<
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"directive '#pragma omp atomic' cannot contain more than one 'read', 'write', 'update', 'capture', or 'compare' clause">;
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def err_omp_several_mem_order_clauses : Error<

‎clang/include/clang/Sema/Sema.h

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Original file line numberDiff line numberDiff line change
@@ -12377,6 +12377,9 @@ class Sema final {
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/// Called on well-formed 'relaxed' clause.
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OMPClause *ActOnOpenMPRelaxedClause(SourceLocation StartLoc,
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SourceLocation EndLoc);
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/// Called on well-formed 'weak' clause.
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OMPClause *ActOnOpenMPWeakClause(SourceLocation StartLoc,
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SourceLocation EndLoc);
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/// Called on well-formed 'init' clause.
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OMPClause *

‎clang/lib/AST/OpenMPClause.cpp

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Original file line numberDiff line numberDiff line change
@@ -1957,6 +1957,8 @@ void OMPClausePrinter::VisitOMPRelaxedClause(OMPRelaxedClause *) {
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OS << "relaxed";
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}
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void OMPClausePrinter::VisitOMPWeakClause(OMPWeakClause *) { OS << "weak"; }
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void OMPClausePrinter::VisitOMPThreadsClause(OMPThreadsClause *) {
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OS << "threads";
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}

‎clang/lib/AST/StmtProfile.cpp

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Original file line numberDiff line numberDiff line change
@@ -594,6 +594,8 @@ void OMPClauseProfiler::VisitOMPReleaseClause(const OMPReleaseClause *) {}
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void OMPClauseProfiler::VisitOMPRelaxedClause(const OMPRelaxedClause *) {}
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void OMPClauseProfiler::VisitOMPWeakClause(const OMPWeakClause *) {}
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void OMPClauseProfiler::VisitOMPThreadsClause(const OMPThreadsClause *) {}
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void OMPClauseProfiler::VisitOMPSIMDClause(const OMPSIMDClause *) {}

‎clang/lib/CodeGen/CGStmtOpenMP.cpp

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Original file line numberDiff line numberDiff line change
@@ -6546,6 +6546,9 @@ void CodeGenFunction::EmitOMPAtomicDirective(const OMPAtomicDirective &S) {
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// Find first clause (skip seq_cst|acq_rel|aqcuire|release|relaxed clause,
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// if it is first).
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OpenMPClauseKind K = C->getClauseKind();
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// TBD
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if (K == OMPC_weak)
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return;
65496552
if (K == OMPC_seq_cst || K == OMPC_acq_rel || K == OMPC_acquire ||
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K == OMPC_release || K == OMPC_relaxed || K == OMPC_hint)
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continue;

‎clang/lib/Parse/ParseOpenMP.cpp

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Original file line numberDiff line numberDiff line change
@@ -3314,6 +3314,7 @@ OMPClause *Parser::ParseOpenMPClause(OpenMPDirectiveKind DKind,
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case OMPC_acquire:
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case OMPC_release:
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case OMPC_relaxed:
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case OMPC_weak:
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case OMPC_threads:
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case OMPC_simd:
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case OMPC_nogroup:

‎clang/lib/Sema/SemaOpenMP.cpp

Lines changed: 32 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -12708,9 +12708,11 @@ StmtResult Sema::ActOnOpenMPAtomicDirective(ArrayRef<OMPClause *> Clauses,
1270812708
}
1270912709
break;
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}
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case OMPC_weak:
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case OMPC_fail: {
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if (!EncounteredAtomicKinds.contains(OMPC_compare)) {
12713-
Diag(C->getBeginLoc(), diag::err_omp_atomic_fail_no_compare)
12714+
Diag(C->getBeginLoc(), diag::err_omp_atomic_no_compare)
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<< getOpenMPClauseName(C->getClauseKind())
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<< SourceRange(C->getBeginLoc(), C->getEndLoc());
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return StmtError();
1271612718
}
@@ -13202,6 +13204,27 @@ StmtResult Sema::ActOnOpenMPAtomicDirective(ArrayRef<OMPClause *> Clauses,
1320213204
E = Checker.getE();
1320313205
D = Checker.getD();
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CE = Checker.getCond();
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// The weak clause may only appear if the resulting atomic operation is
13208+
// an atomic conditional update for which the comparison tests for
13209+
// equality. It was not possible to do this check in
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// OpenMPAtomicCompareChecker::checkStmt() as the check for OMPC_weak
13211+
// could not be performed (Clauses are not available).
13212+
auto *It = find_if(Clauses, [](OMPClause *C) {
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return C->getClauseKind() == llvm::omp::Clause::OMPC_weak;
13214+
});
13215+
if (It != Clauses.end()) {
13216+
auto *Cond = dyn_cast<BinaryOperator>(CE);
13217+
if (Cond->getOpcode() != BO_EQ) {
13218+
ErrorInfo.Error = Checker.ErrorTy::NotAnAssignment;
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ErrorInfo.ErrorLoc = Cond->getExprLoc();
13220+
ErrorInfo.NoteLoc = Cond->getOperatorLoc();
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ErrorInfo.ErrorRange = ErrorInfo.NoteRange = Cond->getSourceRange();
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13223+
Diag(ErrorInfo.ErrorLoc, diag::err_omp_atomic_weak_no_equality)
13224+
<< ErrorInfo.ErrorRange;
13225+
return StmtError();
13226+
}
13227+
}
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// We reuse IsXLHSInRHSPart to tell if it is in the form 'x ordop expr'.
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IsXLHSInRHSPart = Checker.isXBinopExpr();
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}
@@ -17593,6 +17616,9 @@ OMPClause *Sema::ActOnOpenMPClause(OpenMPClauseKind Kind,
1759317616
case OMPC_relaxed:
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Res = ActOnOpenMPRelaxedClause(StartLoc, EndLoc);
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break;
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case OMPC_weak:
17620+
Res = ActOnOpenMPWeakClause(StartLoc, EndLoc);
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break;
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case OMPC_threads:
1759717623
Res = ActOnOpenMPThreadsClause(StartLoc, EndLoc);
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break;
@@ -17781,6 +17807,11 @@ OMPClause *Sema::ActOnOpenMPRelaxedClause(SourceLocation StartLoc,
1778117807
return new (Context) OMPRelaxedClause(StartLoc, EndLoc);
1778217808
}
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17810+
OMPClause *Sema::ActOnOpenMPWeakClause(SourceLocation StartLoc,
17811+
SourceLocation EndLoc) {
17812+
return new (Context) OMPWeakClause(StartLoc, EndLoc);
17813+
}
17814+
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OMPClause *Sema::ActOnOpenMPThreadsClause(SourceLocation StartLoc,
1778517816
SourceLocation EndLoc) {
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return new (Context) OMPThreadsClause(StartLoc, EndLoc);

‎clang/lib/Sema/TreeTransform.h

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@@ -10075,6 +10075,12 @@ TreeTransform<Derived>::TransformOMPRelaxedClause(OMPRelaxedClause *C) {
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return C;
1007610076
}
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10078+
template <typename Derived>
10079+
OMPClause *TreeTransform<Derived>::TransformOMPWeakClause(OMPWeakClause *C) {
10080+
// No need to rebuild this clause, no template-dependent parameters.
10081+
return C;
10082+
}
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1007810084
template <typename Derived>
1007910085
OMPClause *
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TreeTransform<Derived>::TransformOMPThreadsClause(OMPThreadsClause *C) {

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