[OPENMP] Add reverse_offload clause to requires directive

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@343711 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/AST/OpenMPClause.h

@@ -796,6 +796,37 @@ public:
   }
 };
 
+/// This represents 'reverse_offload' clause in the '#pragma omp requires'
+/// directive.
+///
+/// \code
+/// #pragma omp requires reverse_offload
+/// \endcode
+/// In this example directive '#pragma omp requires' has 'reverse_offload'
+/// clause.
+class OMPReverseOffloadClause final : public OMPClause {
+public:
+  friend class OMPClauseReader;
+  /// Build 'reverse_offload' clause.
+  ///
+  /// \param StartLoc Starting location of the clause.
+  /// \param EndLoc Ending location of the clause.
+  OMPReverseOffloadClause(SourceLocation StartLoc, SourceLocation EndLoc)
+      : OMPClause(OMPC_reverse_offload, StartLoc, EndLoc) {}
+
+  /// Build an empty clause.
+  OMPReverseOffloadClause()
+      : OMPClause(OMPC_reverse_offload, SourceLocation(), SourceLocation()) {}
+
+  child_range children() {
+    return child_range(child_iterator(), child_iterator());
+  }
+
+  static bool classof(const OMPClause *T) {
+    return T->getClauseKind() == OMPC_reverse_offload;
+  }
+};
+
 /// This represents 'schedule' clause in the '#pragma omp ...' directive.
 ///
 /// \code

include/clang/AST/RecursiveASTVisitor.h

@@ -2873,6 +2873,12 @@ bool RecursiveASTVisitor<Derived>::VisitOMPUnifiedSharedMemoryClause(
   return true;
 }
 
+template <typename Derived>
+bool RecursiveASTVisitor<Derived>::VisitOMPReverseOffloadClause(
+    OMPReverseOffloadClause *) {
+  return true;
+}
+
 template <typename Derived>
 bool
 RecursiveASTVisitor<Derived>::VisitOMPScheduleClause(OMPScheduleClause *C) {

include/clang/Basic/OpenMPKinds.def

@@ -281,6 +281,7 @@ OPENMP_CLAUSE(task_reduction,  OMPTaskReductionClause)
 OPENMP_CLAUSE(in_reduction,  OMPInReductionClause)
 OPENMP_CLAUSE(unified_address, OMPUnifiedAddressClause)
 OPENMP_CLAUSE(unified_shared_memory, OMPUnifiedSharedMemoryClause)
+OPENMP_CLAUSE(reverse_offload, OMPReverseOffloadClause)
 
 // Clauses allowed for OpenMP directive 'parallel'.
 OPENMP_PARALLEL_CLAUSE(if)
@@ -465,6 +466,7 @@ OPENMP_TARGET_CLAUSE(reduction)
 // Clauses allowed for OpenMP directive 'requires'.
 OPENMP_REQUIRES_CLAUSE(unified_address)
 OPENMP_REQUIRES_CLAUSE(unified_shared_memory)
+OPENMP_REQUIRES_CLAUSE(reverse_offload)
 
 // Clauses allowed for OpenMP directive 'target data'.
 OPENMP_TARGET_DATA_CLAUSE(if)

include/clang/Sema/Sema.h

@@ -9171,6 +9171,10 @@ public:
   /// Called on well-formed 'unified_address' clause.
   OMPClause *ActOnOpenMPUnifiedSharedMemoryClause(SourceLocation StartLoc,
                                                   SourceLocation EndLoc);
+  
+  /// Called on well-formed 'reverse_offload' clause.
+  OMPClause *ActOnOpenMPReverseOffloadClause(SourceLocation StartLoc,
+                                             SourceLocation EndLoc);
 
   OMPClause *ActOnOpenMPVarListClause(
       OpenMPClauseKind Kind, ArrayRef<Expr *> Vars, Expr *TailExpr,

lib/AST/OpenMPClause.cpp

@@ -108,6 +108,7 @@ const OMPClauseWithPreInit *OMPClauseWithPreInit::get(const OMPClause *C) {
   case OMPC_is_device_ptr:
   case OMPC_unified_address:
   case OMPC_unified_shared_memory:
+  case OMPC_reverse_offload:
     break;
   }
 
@@ -179,6 +180,7 @@ const OMPClauseWithPostUpdate *OMPClauseWithPostUpdate::get(const OMPClause *C)
   case OMPC_is_device_ptr:
   case OMPC_unified_address:
   case OMPC_unified_shared_memory:
+  case OMPC_reverse_offload:
     break;
   }
 

lib/AST/StmtPrinter.cpp

@@ -705,6 +705,10 @@ void OMPClausePrinter::VisitOMPUnifiedSharedMemoryClause(
   OS << "unified_shared_memory";
 }
 
+void OMPClausePrinter::VisitOMPReverseOffloadClause(OMPReverseOffloadClause *) {
+  OS << "reverse_offload";
+}
+
 void OMPClausePrinter::VisitOMPScheduleClause(OMPScheduleClause *Node) {
   OS << "schedule(";
   if (Node->getFirstScheduleModifier() != OMPC_SCHEDULE_MODIFIER_unknown) {

lib/AST/StmtProfile.cpp

@@ -473,6 +473,9 @@ void OMPClauseProfiler::VisitOMPUnifiedAddressClause(
 void OMPClauseProfiler::VisitOMPUnifiedSharedMemoryClause(
     const OMPUnifiedSharedMemoryClause *C) {}
 
+void OMPClauseProfiler::VisitOMPReverseOffloadClause(
+    const OMPReverseOffloadClause *C) {}
+
 void OMPClauseProfiler::VisitOMPScheduleClause(const OMPScheduleClause *C) {
   VistOMPClauseWithPreInit(C);
   if (auto *S = C->getChunkSize())

lib/Basic/OpenMPKinds.cpp

@@ -170,6 +170,7 @@ unsigned clang::getOpenMPSimpleClauseType(OpenMPClauseKind Kind,
   case OMPC_is_device_ptr:
   case OMPC_unified_address:
   case OMPC_unified_shared_memory:
+  case OMPC_reverse_offload:
     break;
   }
   llvm_unreachable("Invalid OpenMP simple clause kind");
@@ -313,6 +314,7 @@ const char *clang::getOpenMPSimpleClauseTypeName(OpenMPClauseKind Kind,
   case OMPC_is_device_ptr:
   case OMPC_unified_address:
   case OMPC_unified_shared_memory:
+  case OMPC_reverse_offload:
     break;
   }
   llvm_unreachable("Invalid OpenMP simple clause kind");

lib/CodeGen/CGStmtOpenMP.cpp

@@ -3900,6 +3900,7 @@ static void emitOMPAtomicExpr(CodeGenFunction &CGF, OpenMPClauseKind Kind,
   case OMPC_is_device_ptr:
   case OMPC_unified_address:
   case OMPC_unified_shared_memory:
+  case OMPC_reverse_offload:
     llvm_unreachable("Clause is not allowed in 'omp atomic'.");
   }
 }

lib/Parse/ParseOpenMP.cpp

@@ -1380,6 +1380,7 @@ OMPClause *Parser::ParseOpenMPClause(OpenMPDirectiveKind DKind,
   case OMPC_nogroup:
   case OMPC_unified_address:
   case OMPC_unified_shared_memory:
+  case OMPC_reverse_offload:
     // OpenMP [2.7.1, Restrictions, p. 9]
     //  Only one ordered clause can appear on a loop directive.
     // OpenMP [2.7.1, Restrictions, C/C++, p. 4]

lib/Sema/SemaOpenMP.cpp

@@ -8012,6 +8012,7 @@ OMPClause *Sema::ActOnOpenMPSingleExprClause(OpenMPClauseKind Kind, Expr *Expr,
   case OMPC_is_device_ptr:
   case OMPC_unified_address:
   case OMPC_unified_shared_memory:
+  case OMPC_reverse_offload:
     llvm_unreachable("Clause is not allowed.");
   }
   return Res;
@@ -8535,6 +8536,7 @@ static OpenMPDirectiveKind getOpenMPCaptureRegionForClause(
   case OMPC_is_device_ptr:
   case OMPC_unified_address:
   case OMPC_unified_shared_memory:
+  case OMPC_reverse_offload:
     llvm_unreachable("Unexpected OpenMP clause.");
   }
   return CaptureRegion;
@@ -8854,6 +8856,7 @@ OMPClause *Sema::ActOnOpenMPSimpleClause(
   case OMPC_is_device_ptr:
   case OMPC_unified_address:
   case OMPC_unified_shared_memory:
+  case OMPC_reverse_offload:
     llvm_unreachable("Clause is not allowed.");
   }
   return Res;
@@ -9012,6 +9015,7 @@ OMPClause *Sema::ActOnOpenMPSingleExprWithArgClause(
   case OMPC_is_device_ptr:
   case OMPC_unified_address:
   case OMPC_unified_shared_memory:
+  case OMPC_reverse_offload:
     llvm_unreachable("Clause is not allowed.");
   }
   return Res;
@@ -9173,6 +9177,9 @@ OMPClause *Sema::ActOnOpenMPClause(OpenMPClauseKind Kind,
   case OMPC_unified_shared_memory:
     Res = ActOnOpenMPUnifiedSharedMemoryClause(StartLoc, EndLoc);
     break;
+  case OMPC_reverse_offload:
+    Res = ActOnOpenMPReverseOffloadClause(StartLoc, EndLoc);
+    break;
   case OMPC_if:
   case OMPC_final:
   case OMPC_num_threads:
@@ -9283,6 +9290,11 @@ OMPClause *Sema::ActOnOpenMPUnifiedSharedMemoryClause(SourceLocation StartLoc,
   return new (Context) OMPUnifiedSharedMemoryClause(StartLoc, EndLoc);
 }
 
+OMPClause *Sema::ActOnOpenMPReverseOffloadClause(SourceLocation StartLoc,
+                                                 SourceLocation EndLoc) {
+  return new (Context) OMPReverseOffloadClause(StartLoc, EndLoc);
+}
+
 OMPClause *Sema::ActOnOpenMPVarListClause(
     OpenMPClauseKind Kind, ArrayRef<Expr *> VarList, Expr *TailExpr,
     SourceLocation StartLoc, SourceLocation LParenLoc, SourceLocation ColonLoc,
@@ -9392,6 +9404,7 @@ OMPClause *Sema::ActOnOpenMPVarListClause(
   case OMPC_uniform:
   case OMPC_unified_address:
   case OMPC_unified_shared_memory:
+  case OMPC_reverse_offload:
     llvm_unreachable("Clause is not allowed.");
   }
   return Res;

lib/Sema/TreeTransform.h

@@ -8443,6 +8443,12 @@ OMPClause *TreeTransform<Derived>::TransformOMPUnifiedSharedMemoryClause(
       "unified_shared_memory clause cannot appear in dependent context");
 }
 
+template <typename Derived>
+OMPClause *TreeTransform<Derived>::TransformOMPReverseOffloadClause(
+    OMPReverseOffloadClause *C) {
+  llvm_unreachable("reverse_offload clause cannot appear in dependent context");
+}
+
 template <typename Derived>
 OMPClause *
 TreeTransform<Derived>::TransformOMPPrivateClause(OMPPrivateClause *C) {

lib/Serialization/ASTReader.cpp

@@ -11726,6 +11726,9 @@ OMPClause *OMPClauseReader::readClause() {
   case OMPC_unified_shared_memory:
     C = new (Context) OMPUnifiedSharedMemoryClause();
     break;
+  case OMPC_reverse_offload:
+    C = new (Context) OMPReverseOffloadClause();
+    break;
   case OMPC_private:
     C = OMPPrivateClause::CreateEmpty(Context, Record.readInt());
     break;
@@ -11959,6 +11962,8 @@ void OMPClauseReader::VisitOMPUnifiedAddressClause(OMPUnifiedAddressClause *) {}
 void OMPClauseReader::VisitOMPUnifiedSharedMemoryClause(
     OMPUnifiedSharedMemoryClause *) {}
 
+void OMPClauseReader::VisitOMPReverseOffloadClause(OMPReverseOffloadClause *) {}
+
 void OMPClauseReader::VisitOMPPrivateClause(OMPPrivateClause *C) {
   C->setLParenLoc(Record.readSourceLocation());
   unsigned NumVars = C->varlist_size();

lib/Serialization/ASTWriter.cpp

@@ -6935,3 +6935,5 @@ void OMPClauseWriter::VisitOMPUnifiedAddressClause(OMPUnifiedAddressClause *) {}
 
 void OMPClauseWriter::VisitOMPUnifiedSharedMemoryClause(
     OMPUnifiedSharedMemoryClause *) {}
+
+void OMPClauseWriter::VisitOMPReverseOffloadClause(OMPReverseOffloadClause *) {}

test/OpenMP/requires_unified_address_ast_print.cpp

@@ -16,4 +16,7 @@
 #pragma omp requires unified_shared_memory
 // CHECK:#pragma omp requires unified_shared_memory
 
+#pragma omp requires reverse_offload
+// CHECK:#pragma omp requires reverse_offload
+
 #endif

test/OpenMP/requires_unified_address_messages.cpp

@@ -10,6 +10,10 @@
 
 #pragma omp requires unified_address, unified_address // expected-error {{Only one unified_address clause can appear on a requires directive in a single translation unit}} expected-error {{directive '#pragma omp requires' cannot contain more than one 'unified_address' clause}}
 
+#pragma omp requires reverse_offload // expected-note {{reverse_offload clause previously used here}} expected-note {{reverse_offload clause previously used here}}
+
+#pragma omp requires reverse_offload, reverse_offload // expected-error {{Only one reverse_offload clause can appear on a requires directive in a single translation unit}} expected-error {{directive '#pragma omp requires' cannot contain more than one 'reverse_offload' clause}}
+
 #pragma omp requires // expected-error {{expected at least one clause on '#pragma omp requires' directive}}
 
 #pragma omp requires invalid_clause // expected-warning {{extra tokens at the end of '#pragma omp requires' are ignored}} expected-error {{expected at least one clause on '#pragma omp requires' directive}}
@@ -20,7 +24,7 @@
 
 #pragma omp requires invalid_clause unified_address // expected-warning {{extra tokens at the end of '#pragma omp requires' are ignored}} expected-error {{expected at least one clause on '#pragma omp requires' directive}}
 
-#pragma omp requires unified_shared_memory, unified_address // expected-error {{Only one unified_shared_memory clause can appear on a requires directive in a single translation unit}} expected-error{{Only one unified_address clause can appear on a requires directive in a single translation unit}}
+#pragma omp requires unified_shared_memory, unified_address, reverse_offload // expected-error {{Only one unified_shared_memory clause can appear on a requires directive in a single translation unit}} expected-error{{Only one unified_address clause can appear on a requires directive in a single translation unit}} expected-error{{Only one reverse_offload clause can appear on a requires directive in a single translation unit}}
 
 namespace A {
   #pragma omp requires unified_address // expected-error {{Only one unified_address clause can appear on a requires directive in a single translation unit}}

tools/libclang/CIndex.cpp

@@ -2213,6 +2213,9 @@ void OMPClauseEnqueue::VisitOMPUnifiedAddressClause(
 void OMPClauseEnqueue::VisitOMPUnifiedSharedMemoryClause(
     const OMPUnifiedSharedMemoryClause *) {}
 
+void OMPClauseEnqueue::VisitOMPReverseOffloadClause(
+    const OMPReverseOffloadClause *) {}
+
 void OMPClauseEnqueue::VisitOMPDeviceClause(const OMPDeviceClause *C) {
   Visitor->AddStmt(C->getDevice());
 }