[PATCH] D22785: [OpenMP] diagnose orphaned teams construct

[Kelvin Li via cfe-commits]

kkwli0 created this revision.
kkwli0 added reviewers: ABataev, sfantao, carlo.bertolli, arpith-jacob, hfinkel.
kkwli0 added a subscriber: cfe-commits.

The spec mandates that 'a teams construct must be contained within a target construct'.  Currently, this scenario is not diagnosed.  This patch is to add check for orphaned teams construct and issue an error message.

https://reviews.llvm.org/D22785

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Sema/SemaOpenMP.cpp
  test/OpenMP/nesting_of_regions.cpp

Index: test/OpenMP/nesting_of_regions.cpp
===================================================================
--- test/OpenMP/nesting_of_regions.cpp
+++ test/OpenMP/nesting_of_regions.cpp
@@ -3693,6 +3693,8 @@
   }    
 
 // TEAMS DIRECTIVE
+#pragma omp teams // expected-error {{orphaned 'omp teams' directives are prohibited; perhaps you forget to enclose the directive into a target region?}}
+  bar();
 #pragma omp target
 #pragma omp teams
 #pragma omp parallel
Index: lib/Sema/SemaOpenMP.cpp
===================================================================
--- lib/Sema/SemaOpenMP.cpp
+++ lib/Sema/SemaOpenMP.cpp
@@ -3172,6 +3172,7 @@
     auto OffendingRegion = ParentRegion;
     bool NestingProhibited = false;
     bool CloseNesting = true;
+    bool OrphanSeen = false; 
     enum {
       NoRecommend,
       ShouldBeInParallelRegion,
@@ -3213,9 +3214,10 @@
       }
       return false;
     }
-    // Allow some constructs to be orphaned (they could be used in functions,
-    // called from OpenMP regions with the required preconditions).
-    if (ParentRegion == OMPD_unknown)
+    // Allow some constructs (except teams) to be orphaned (they could be
+    // used in functions, called from OpenMP regions with the required 
+    // preconditions).
+    if (ParentRegion == OMPD_unknown && !isOpenMPTeamsDirective(CurrentRegion))
       return false;
     if (CurrentRegion == OMPD_cancellation_point ||
         CurrentRegion == OMPD_cancel) {
@@ -3315,6 +3317,7 @@
       // If specified, a teams construct must be contained within a target
       // construct.
       NestingProhibited = ParentRegion != OMPD_target;
+      OrphanSeen = ParentRegion == OMPD_unknown;
       Recommend = ShouldBeInTargetRegion;
       Stack->setParentTeamsRegionLoc(Stack->getConstructLoc());
     }
@@ -3354,9 +3357,13 @@
       CloseNesting = false;
     }
     if (NestingProhibited) {
-      SemaRef.Diag(StartLoc, diag::err_omp_prohibited_region)
-          << CloseNesting << getOpenMPDirectiveName(OffendingRegion)
-          << Recommend << getOpenMPDirectiveName(CurrentRegion);
+      if (OrphanSeen)
+        SemaRef.Diag(StartLoc, diag::err_omp_orphaned_device_directive)
+            << getOpenMPDirectiveName(CurrentRegion) << Recommend;
+      else
+        SemaRef.Diag(StartLoc, diag::err_omp_prohibited_region)
+            << CloseNesting << getOpenMPDirectiveName(OffendingRegion)
+            << Recommend << getOpenMPDirectiveName(CurrentRegion);
       return true;
     }
   }
Index: include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- include/clang/Basic/DiagnosticSemaKinds.td
+++ include/clang/Basic/DiagnosticSemaKinds.td
@@ -8389,6 +8389,9 @@
 def warn_omp_nesting_simd : Warning<
   "OpenMP only allows an ordered construct with the simd clause nested in a simd construct">,
   InGroup<SourceUsesOpenMP>;
+def err_omp_orphaned_device_directive : Error<
+  "orphaned 'omp %0' directives are prohibited"
+  "; perhaps you forget to enclose the directive into a %select{|||target |teams }1region?">;
 } // end of OpenMP category
 
 let CategoryName = "Related Result Type Issue" in {


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