[PATCH] D99288: [OPENMP]Fix PR49468: Declare target should allow empty sequences and namespaces.

[Alexey Bataev via Phabricator via cfe-commits]

ABataev created this revision.
ABataev added reviewers: jdoerfert, mikerice.
Herald added subscribers: guansong, yaxunl.
ABataev requested review of this revision.
Herald added a subscriber: sstefan1.
Herald added a project: clang.

The emty declare target/end declare target region should not cause an
error emission.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D99288

Files:
  clang/lib/Parse/ParseOpenMP.cpp
  clang/test/OpenMP/declare_target_ast_print.cpp


Index: clang/test/OpenMP/declare_target_ast_print.cpp
===================================================================
--- clang/test/OpenMP/declare_target_ast_print.cpp
+++ clang/test/OpenMP/declare_target_ast_print.cpp
@@ -277,4 +277,8 @@
 // CHECK-NEXT: int ts = 1;
 // CHECK-NEXT: #pragma omp end declare target
 
+// Do not expect anything here since the region is empty.
+#pragma omp declare target
+#pragma omp end declare target
+
 #endif
Index: clang/lib/Parse/ParseOpenMP.cpp
===================================================================
--- clang/lib/Parse/ParseOpenMP.cpp
+++ clang/lib/Parse/ParseOpenMP.cpp
@@ -2115,9 +2115,18 @@
 
     ParsingOpenMPDirectiveRAII NormalScope(*this, /*Value=*/false);
     llvm::SmallVector<Decl *, 4> Decls;
-    DKind = parseOpenMPDirectiveKind(*this);
-    while (DKind != OMPD_end_declare_target && Tok.isNot(tok::eof) &&
-           Tok.isNot(tok::r_brace)) {
+    while (Tok.isNot(tok::eof) && Tok.isNot(tok::r_brace)) {
+      if (Tok.isAnnotation() && Tok.is(tok::annot_pragma_openmp)) {
+        TentativeParsingAction TPA(*this);
+        ConsumeAnnotationToken();
+        DKind = parseOpenMPDirectiveKind(*this);
+        if (DKind != OMPD_end_declare_target)
+          TPA.Revert();
+        else
+          TPA.Commit();
+      }
+      if (DKind == OMPD_end_declare_target)
+        break;
       DeclGroupPtrTy Ptr;
       // Here we expect to see some function declaration.
       if (AS == AS_none) {
@@ -2133,15 +2142,6 @@
         DeclGroupRef Ref = Ptr.get();
         Decls.append(Ref.begin(), Ref.end());
       }
-      if (Tok.isAnnotation() && Tok.is(tok::annot_pragma_openmp)) {
-        TentativeParsingAction TPA(*this);
-        ConsumeAnnotationToken();
-        DKind = parseOpenMPDirectiveKind(*this);
-        if (DKind != OMPD_end_declare_target)
-          TPA.Revert();
-        else
-          TPA.Commit();
-      }
     }
 
     ParseOMPEndDeclareTargetDirective(DKind, DTLoc);


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