[flang][OpenMP] General utility to get directive id from AST node (#150121)

kparzysz · web-flow · commit 43db6c5cc1a8 · 2025-07-23T08:25:33.000-05:00
Fortran::parser::omp::GetOmpDirectiveName(t) will get the
OmpDirectiveName object that corresponds to construct t. That object (an
AST node) contains the enum id and the source information of the
directive.

Replace uses of extractOmpDirective and getOpenMPDirectiveEnum with the
new function.
diff --git a/flang/include/flang/Parser/openmp-utils.h b/flang/include/flang/Parser/openmp-utils.h
@@ -0,0 +1,161 @@
+//===-- flang/Parser/openmp-utils.h ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Common OpenMP utilities.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef FORTRAN_PARSER_OPENMP_UTILS_H
+#define FORTRAN_PARSER_OPENMP_UTILS_H
+
+#include "flang/Common/indirection.h"
+#include "flang/Parser/parse-tree.h"
+#include "llvm/Frontend/OpenMP/OMP.h"
+
+#include <cassert>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+#include <variant>
+
+namespace Fortran::parser::omp {
+
+namespace detail {
+using D = llvm::omp::Directive;
+
+template <typename Construct> //
+struct ConstructId {
+  static constexpr llvm::omp::Directive id{D::OMPD_unknown};
+};
+
+#define MAKE_CONSTR_ID(Construct, Id) \
+  template <> struct ConstructId<Construct> { \
+    static constexpr llvm::omp::Directive id{Id}; \
+  }
+
+MAKE_CONSTR_ID(OmpAssumeDirective, D::OMPD_assume);
+MAKE_CONSTR_ID(OmpCriticalDirective, D::OMPD_critical);
+MAKE_CONSTR_ID(OmpDeclareVariantDirective, D::OMPD_declare_variant);
+MAKE_CONSTR_ID(OmpErrorDirective, D::OMPD_error);
+MAKE_CONSTR_ID(OmpMetadirectiveDirective, D::OMPD_metadirective);
+MAKE_CONSTR_ID(OpenMPDeclarativeAllocate, D::OMPD_allocate);
+MAKE_CONSTR_ID(OpenMPDeclarativeAssumes, D::OMPD_assumes);
+MAKE_CONSTR_ID(OpenMPDeclareMapperConstruct, D::OMPD_declare_mapper);
+MAKE_CONSTR_ID(OpenMPDeclareReductionConstruct, D::OMPD_declare_reduction);
+MAKE_CONSTR_ID(OpenMPDeclareSimdConstruct, D::OMPD_declare_simd);
+MAKE_CONSTR_ID(OpenMPDeclareTargetConstruct, D::OMPD_declare_target);
+MAKE_CONSTR_ID(OpenMPExecutableAllocate, D::OMPD_allocate);
+MAKE_CONSTR_ID(OpenMPRequiresConstruct, D::OMPD_requires);
+MAKE_CONSTR_ID(OpenMPThreadprivate, D::OMPD_threadprivate);
+
+#undef MAKE_CONSTR_ID
+
+struct DirectiveNameScope {
+  static OmpDirectiveName MakeName(CharBlock source = {},
+      llvm::omp::Directive id = llvm::omp::Directive::OMPD_unknown) {
+    OmpDirectiveName name;
+    name.source = source;
+    name.v = id;
+    return name;
+  }
+
+  static OmpDirectiveName GetOmpDirectiveName(const OmpNothingDirective &x) {
+    return MakeName(x.source, llvm::omp::Directive::OMPD_nothing);
+  }
+
+  static OmpDirectiveName GetOmpDirectiveName(const OmpBeginBlockDirective &x) {
+    auto &dir{std::get<OmpBlockDirective>(x.t)};
+    return MakeName(dir.source, dir.v);
+  }
+
+  static OmpDirectiveName GetOmpDirectiveName(const OmpBeginLoopDirective &x) {
+    auto &dir{std::get<OmpLoopDirective>(x.t)};
+    return MakeName(dir.source, dir.v);
+  }
+
+  static OmpDirectiveName GetOmpDirectiveName(
+      const OmpBeginSectionsDirective &x) {
+    auto &dir{std::get<OmpSectionsDirective>(x.t)};
+    return MakeName(dir.source, dir.v);
+  }
+
+  template <typename T>
+  static OmpDirectiveName GetOmpDirectiveName(const T &x) {
+    if constexpr (WrapperTrait<T>) {
+      if constexpr (std::is_same_v<T, OpenMPCancelConstruct> ||
+          std::is_same_v<T, OpenMPCancellationPointConstruct> ||
+          std::is_same_v<T, OpenMPDepobjConstruct> ||
+          std::is_same_v<T, OpenMPFlushConstruct> ||
+          std::is_same_v<T, OpenMPInteropConstruct> ||
+          std::is_same_v<T, OpenMPSimpleStandaloneConstruct>) {
+        return x.v.DirName();
+      } else {
+        return GetOmpDirectiveName(x.v);
+      }
+    } else if constexpr (TupleTrait<T>) {
+      if constexpr (std::is_same_v<T, OpenMPAllocatorsConstruct> ||
+          std::is_same_v<T, OpenMPAtomicConstruct> ||
+          std::is_same_v<T, OpenMPDispatchConstruct>) {
+        return std::get<OmpDirectiveSpecification>(x.t).DirName();
+      } else if constexpr (std::is_same_v<T, OmpAssumeDirective> ||
+          std::is_same_v<T, OmpCriticalDirective> ||
+          std::is_same_v<T, OmpDeclareVariantDirective> ||
+          std::is_same_v<T, OmpErrorDirective> ||
+          std::is_same_v<T, OmpMetadirectiveDirective> ||
+          std::is_same_v<T, OpenMPDeclarativeAllocate> ||
+          std::is_same_v<T, OpenMPDeclarativeAssumes> ||
+          std::is_same_v<T, OpenMPDeclareMapperConstruct> ||
+          std::is_same_v<T, OpenMPDeclareReductionConstruct> ||
+          std::is_same_v<T, OpenMPDeclareSimdConstruct> ||
+          std::is_same_v<T, OpenMPDeclareTargetConstruct> ||
+          std::is_same_v<T, OpenMPExecutableAllocate> ||
+          std::is_same_v<T, OpenMPRequiresConstruct> ||
+          std::is_same_v<T, OpenMPThreadprivate>) {
+        return MakeName(std::get<Verbatim>(x.t).source, ConstructId<T>::id);
+      } else {
+        return GetFromTuple(
+            x.t, std::make_index_sequence<std::tuple_size_v<decltype(x.t)>>{});
+      }
+    } else if constexpr (UnionTrait<T>) {
+      return common::visit(
+          [](auto &&s) { return GetOmpDirectiveName(s); }, x.u);
+    } else {
+      return MakeName();
+    }
+  }
+
+  template <typename... Ts, size_t... Is>
+  static OmpDirectiveName GetFromTuple(
+      const std::tuple<Ts...> &t, std::index_sequence<Is...>) {
+    OmpDirectiveName name = MakeName();
+    auto accumulate = [&](const OmpDirectiveName &n) {
+      if (name.v == llvm::omp::Directive::OMPD_unknown) {
+        name = n;
+      } else {
+        assert(
+            n.v == llvm::omp::Directive::OMPD_unknown && "Conflicting names");
+      }
+    };
+    (accumulate(GetOmpDirectiveName(std::get<Is>(t))), ...);
+    return name;
+  }
+
+  template <typename T>
+  static OmpDirectiveName GetOmpDirectiveName(const common::Indirection<T> &x) {
+    return GetOmpDirectiveName(x.value());
+  }
+};
+} // namespace detail
+
+template <typename T> OmpDirectiveName GetOmpDirectiveName(const T &x) {
+  return detail::DirectiveNameScope::GetOmpDirectiveName(x);
+}
+
+} // namespace Fortran::parser::omp
+
+#endif // FORTRAN_PARSER_OPENMP_UTILS_H
diff --git a/flang/lib/Lower/OpenMP/DataSharingProcessor.cpp b/flang/lib/Lower/OpenMP/DataSharingProcessor.cpp
@@ -24,6 +24,7 @@
 #include "flang/Optimizer/Dialect/FIROps.h"
 #include "flang/Optimizer/HLFIR/HLFIRDialect.h"
 #include "flang/Optimizer/HLFIR/HLFIROps.h"
+#include "flang/Parser/openmp-utils.h"
 #include "flang/Semantics/attr.h"
 #include "flang/Semantics/tools.h"
 #include "llvm/ADT/Sequence.h"
@@ -465,7 +466,8 @@ bool DataSharingProcessor::isOpenMPPrivatizingConstruct(
   // allow a privatizing clause) are: dispatch, distribute, do, for, loop,
   // parallel, scope, sections, simd, single, target, target_data, task,
   // taskgroup, taskloop, and teams.
-  return llvm::is_contained(privatizing, extractOmpDirective(omp));
+  return llvm::is_contained(privatizing,
+                            parser::omp::GetOmpDirectiveName(omp).v);
 }
 
 bool DataSharingProcessor::isOpenMPPrivatizingEvaluation(
diff --git a/flang/lib/Lower/OpenMP/OpenMP.cpp b/flang/lib/Lower/OpenMP/OpenMP.cpp
@@ -31,6 +31,7 @@
 #include "flang/Optimizer/Dialect/FIRType.h"
 #include "flang/Optimizer/HLFIR/HLFIROps.h"
 #include "flang/Parser/characters.h"
+#include "flang/Parser/openmp-utils.h"
 #include "flang/Parser/parse-tree.h"
 #include "flang/Semantics/openmp-directive-sets.h"
 #include "flang/Semantics/tools.h"
@@ -63,28 +64,6 @@ static void processHostEvalClauses(lower::AbstractConverter &converter,
                                    lower::pft::Evaluation &eval,
                                    mlir::Location loc);
 
-static llvm::omp::Directive
-getOpenMPDirectiveEnum(const parser::OmpLoopDirective &beginStatment) {
-  return beginStatment.v;
-}
-
-static llvm::omp::Directive getOpenMPDirectiveEnum(
-    const parser::OmpBeginLoopDirective &beginLoopDirective) {
-  return getOpenMPDirectiveEnum(
-      std::get<parser::OmpLoopDirective>(beginLoopDirective.t));
-}
-
-static llvm::omp::Directive
-getOpenMPDirectiveEnum(const parser::OpenMPLoopConstruct &ompLoopConstruct) {
-  return getOpenMPDirectiveEnum(
-      std::get<parser::OmpBeginLoopDirective>(ompLoopConstruct.t));
-}
-
-static llvm::omp::Directive getOpenMPDirectiveEnum(
-    const common::Indirection<parser::OpenMPLoopConstruct> &ompLoopConstruct) {
-  return getOpenMPDirectiveEnum(ompLoopConstruct.value());
-}
-
 namespace {
 /// Structure holding information that is needed to pass host-evaluated
 /// information to later lowering stages.
@@ -468,7 +447,7 @@ static void processHostEvalClauses(lower::AbstractConverter &converter,
     llvm::omp::Directive dir;
     auto &nested = parent.getFirstNestedEvaluation();
     if (const auto *ompEval = nested.getIf<parser::OpenMPConstruct>())
-      dir = extractOmpDirective(*ompEval);
+      dir = parser::omp::GetOmpDirectiveName(*ompEval).v;
     else
       return std::nullopt;
 
@@ -508,7 +487,7 @@ static void processHostEvalClauses(lower::AbstractConverter &converter,
     HostEvalInfo *hostInfo = getHostEvalInfoStackTop(converter);
     assert(hostInfo && "expected HOST_EVAL info structure");
 
-    switch (extractOmpDirective(*ompEval)) {
+    switch (parser::omp::GetOmpDirectiveName(*ompEval).v) {
     case OMPD_teams_distribute_parallel_do:
     case OMPD_teams_distribute_parallel_do_simd:
       cp.processThreadLimit(stmtCtx, hostInfo->ops);
@@ -569,7 +548,8 @@ static void processHostEvalClauses(lower::AbstractConverter &converter,
 
   const auto *ompEval = eval.getIf<parser::OpenMPConstruct>();
   assert(ompEval &&
-         llvm::omp::allTargetSet.test(extractOmpDirective(*ompEval)) &&
+         llvm::omp::allTargetSet.test(
+             parser::omp::GetOmpDirectiveName(*ompEval).v) &&
          "expected TARGET construct evaluation");
   (void)ompEval;
 
@@ -3872,7 +3852,7 @@ static void genOMP(lower::AbstractConverter &converter, lower::SymMap &symTable,
             std::get_if<common::Indirection<parser::OpenMPLoopConstruct>>(
                 &*optLoopCons)}) {
       llvm::omp::Directive nestedDirective =
-          getOpenMPDirectiveEnum(*ompNestedLoopCons);
+          parser::omp::GetOmpDirectiveName(*ompNestedLoopCons).v;
       switch (nestedDirective) {
       case llvm::omp::Directive::OMPD_tile:
         // Emit the omp.loop_nest with annotation for tiling
@@ -3889,7 +3869,8 @@ static void genOMP(lower::AbstractConverter &converter, lower::SymMap &symTable,
     }
   }
 
-  llvm::omp::Directive directive = getOpenMPDirectiveEnum(beginLoopDirective);
+  llvm::omp::Directive directive =
+      parser::omp::GetOmpDirectiveName(beginLoopDirective).v;
   const parser::CharBlock &source =
       std::get<parser::OmpLoopDirective>(beginLoopDirective.t).source;
   ConstructQueue queue{
diff --git a/flang/lib/Lower/OpenMP/Utils.cpp b/flang/lib/Lower/OpenMP/Utils.cpp
@@ -20,6 +20,7 @@
 #include <flang/Lower/PFTBuilder.h>
 #include <flang/Optimizer/Builder/FIRBuilder.h>
 #include <flang/Optimizer/Builder/Todo.h>
+#include <flang/Parser/openmp-utils.h>
 #include <flang/Parser/parse-tree.h>
 #include <flang/Parser/tools.h>
 #include <flang/Semantics/tools.h>
@@ -663,89 +664,6 @@ bool collectLoopRelatedInfo(
   return found;
 }
 
-/// Get the directive enumeration value corresponding to the given OpenMP
-/// construct PFT node.
-llvm::omp::Directive
-extractOmpDirective(const parser::OpenMPConstruct &ompConstruct) {
-  return common::visit(
-      common::visitors{
-          [](const parser::OpenMPAllocatorsConstruct &c) {
-            return llvm::omp::OMPD_allocators;
-          },
-          [](const parser::OpenMPAssumeConstruct &c) {
-            return llvm::omp::OMPD_assume;
-          },
-          [](const parser::OpenMPAtomicConstruct &c) {
-            return llvm::omp::OMPD_atomic;
-          },
-          [](const parser::OpenMPBlockConstruct &c) {
-            return std::get<parser::OmpBlockDirective>(
-                       std::get<parser::OmpBeginBlockDirective>(c.t).t)
-                .v;
-          },
-          [](const parser::OpenMPCriticalConstruct &c) {
-            return llvm::omp::OMPD_critical;
-          },
-          [](const parser::OpenMPDeclarativeAllocate &c) {
-            return llvm::omp::OMPD_allocate;
-          },
-          [](const parser::OpenMPDispatchConstruct &c) {
-            return llvm::omp::OMPD_dispatch;
-          },
-          [](const parser::OpenMPExecutableAllocate &c) {
-            return llvm::omp::OMPD_allocate;
-          },
-          [](const parser::OpenMPLoopConstruct &c) {
-            return std::get<parser::OmpLoopDirective>(
-                       std::get<parser::OmpBeginLoopDirective>(c.t).t)
-                .v;
-          },
-          [](const parser::OpenMPSectionConstruct &c) {
-            return llvm::omp::OMPD_section;
-          },
-          [](const parser::OpenMPSectionsConstruct &c) {
-            return std::get<parser::OmpSectionsDirective>(
-                       std::get<parser::OmpBeginSectionsDirective>(c.t).t)
-                .v;
-          },
-          [](const parser::OpenMPStandaloneConstruct &c) {
-            return common::visit(
-                common::visitors{
-                    [](const parser::OpenMPSimpleStandaloneConstruct &c) {
-                      return c.v.DirId();
-                    },
-                    [](const parser::OpenMPFlushConstruct &c) {
-                      return llvm::omp::OMPD_flush;
-                    },
-                    [](const parser::OpenMPCancelConstruct &c) {
-                      return llvm::omp::OMPD_cancel;
-                    },
-                    [](const parser::OpenMPCancellationPointConstruct &c) {
-                      return llvm::omp::OMPD_cancellation_point;
-                    },
-                    [](const parser::OmpMetadirectiveDirective &c) {
-                      return llvm::omp::OMPD_metadirective;
-                    },
-                    [](const parser::OpenMPDepobjConstruct &c) {
-                      return llvm::omp::OMPD_depobj;
-                    },
-                    [](const parser::OpenMPInteropConstruct &c) {
-                      return llvm::omp::OMPD_interop;
-                    }},
-                c.u);
-          },
-          [](const parser::OpenMPUtilityConstruct &c) {
-            return common::visit(
-                common::visitors{[](const parser::OmpErrorDirective &c) {
-                                   return llvm::omp::OMPD_error;
-                                 },
-                                 [](const parser::OmpNothingDirective &c) {
-                                   return llvm::omp::OMPD_nothing;
-                                 }},
-                c.u);
-          }},
-      ompConstruct.u);
-}
 } // namespace omp
 } // namespace lower
 } // namespace Fortran
diff --git a/flang/lib/Lower/OpenMP/Utils.h b/flang/lib/Lower/OpenMP/Utils.h
@@ -167,8 +167,6 @@ bool collectLoopRelatedInfo(
     mlir::omp::LoopRelatedClauseOps &result,
     llvm::SmallVectorImpl<const semantics::Symbol *> &iv);
 
-llvm::omp::Directive
-extractOmpDirective(const parser::OpenMPConstruct &ompConstruct);
 } // namespace omp
 } // namespace lower
 } // namespace Fortran
