[OpenMP] Prevent nesting of target constructs within target code execution regions.

Summary:
This patch enhances Sema to check for the following restriction:

OpenMP 4.5 [2.17 Nesting of Regions]
If a target, target update, target data, target enter data, or
target exit data construct is encountered during execution of a
target region, the behavior is unspecified.

Reviewers: ABataev

Differential Revision: http://reviews.llvm.org/D16758

llvm-svn: 259366

1 files changed, 9 insertions, 2 deletions

diff --git a/clang/lib/Basic/OpenMPKinds.cpp b/clang/lib/Basic/OpenMPKinds.cpp
index e66a3e331e6..523e603ee90 100644
--- a/clang/lib/Basic/OpenMPKinds.cpp
+++ b/clang/lib/Basic/OpenMPKinds.cpp
@@ -576,8 +576,15 @@ bool clang::isOpenMPParallelDirective(OpenMPDirectiveKind DKind) {
          // TODO add next directives.
 }
 
-bool clang::isOpenMPTargetDirective(OpenMPDirectiveKind DKind) {
-  return DKind == OMPD_target; // TODO add next directives.
+bool clang::isOpenMPTargetExecutionDirective(OpenMPDirectiveKind DKind) {
+  // TODO add next directives.
+  return DKind == OMPD_target || DKind == OMPD_target_parallel;
+}
+
+bool clang::isOpenMPTargetDataManagementDirective(OpenMPDirectiveKind DKind) {
+  // TODO add target update directive check.
+  return DKind == OMPD_target_data || DKind == OMPD_target_enter_data ||
+         DKind == OMPD_target_exit_data;
 }
 
 bool clang::isOpenMPTeamsDirective(OpenMPDirectiveKind DKind) {