[OpenMP 5.0] Parsing/sema support for "omp declare mapper" directive.

This patch implements parsing and sema for "omp declare mapper"
directive. User defined mapper, i.e., declare mapper directive, is a new
feature in OpenMP 5.0. It is introduced to extend existing map clauses
for the purpose of simplifying the copy of complex data structures
between host and device (i.e., deep copy). An example is shown below:

    struct S {  int len;  int *d; };
    #pragma omp declare mapper(struct S s) map(s, s.d[0:s.len]) // Memory region that d points to is also mapped using this mapper.

Contributed-by: Lingda Li <lildmh@gmail.com>

Differential Revision: https://reviews.llvm.org/D56326

llvm-svn: 352906

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/AST/DeclBase.cpp b/clang/lib/AST/DeclBase.cpp
index 2d6fbdd..a44c839 100644
--- a/clang/lib/AST/DeclBase.cpp
+++ b/clang/lib/AST/DeclBase.cpp
@@ -780,6 +780,9 @@ unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) {
     case OMPDeclareReduction:
       return IDNS_OMPReduction;
 
+    case OMPDeclareMapper:
+      return IDNS_OMPMapper;
+
     // Never have names.
     case Friend:
     case FriendTemplate:
@@ -1163,6 +1166,7 @@ DeclContext *DeclContext::getPrimaryContext() {
   case Decl::Block:
   case Decl::Captured:
   case Decl::OMPDeclareReduction:
+  case Decl::OMPDeclareMapper:
     // There is only one DeclContext for these entities.
     return this;