================
@@ -16,13 +16,58 @@
#include "token-parsers.h"
#include "type-parser-implementation.h"
#include "flang/Parser/parse-tree.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Frontend/OpenMP/OMP.h"
// OpenMP Directives and Clauses
namespace Fortran::parser {
constexpr auto startOmpLine = skipStuffBeforeStatement >> "!$OMP "_sptok;
constexpr auto endOmpLine = space >> endOfLine;
+/// Parse OpenMP directive name (this includes compound directives).
+struct OmpDirectiveNameParser {
+ using resultType = llvm::omp::Directive;
+ using Token = TokenStringMatch<false, false>;
+
+ std::optional<resultType> Parse(ParseState &state) const {
+ for (const NameWithId &nid : directives()) {
+ if (attempt(Token(nid.first.data())).Parse(state)) {
+ return nid.second;
+ }
+ }
+ return std::nullopt;
+ }
+
+private:
+ using NameWithId = std::pair<std::string, llvm::omp::Directive>;
+
+ llvm::iterator_range<const NameWithId *> directives() const;
+ void initTokens(NameWithId *) const;
+};
+
+llvm::iterator_range<const OmpDirectiveNameParser::NameWithId *>
+OmpDirectiveNameParser::directives() const {
+ static NameWithId table[llvm::omp::Directive_enumSize];
+ [[maybe_unused]] static bool init = (initTokens(table), true);
----------------
kparzysz wrote:
The issue here is with thread-safety. Starting with C++11, the standard
guarantees that local statics are initialized in a thread-safe manner, that is,
that the initializer code is only executed by a single thread. Hence the
"trick" is to make the preparation of a local static be a part of the
initializer. This is a de facto standard in the LLVM code, although I didn't
see it mentioned in the coding guidelines. It's somewhat rare, but within the
set of use cases it's the preferred solution.
https://github.com/llvm/llvm-project/pull/118128
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