[OpenACC,3/7] host_data construct (C front-end)

diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
index 16db41f..76ece42 100644
--- a/gcc/cp/cp-tree.h
+++ b/gcc/cp/cp-tree.h
@@ -6318,6 +6318,7 @@  extern void finish_omp_threadprivate		(tree);
 extern tree begin_omp_structured_block		(void);
 extern tree finish_omp_structured_block		(tree);
 extern tree finish_oacc_data			(tree, tree);
+extern tree finish_oacc_host_data		(tree, tree);
 extern tree finish_oacc_kernels			(tree, tree);
 extern tree finish_oacc_parallel		(tree, tree);
 extern tree begin_omp_parallel			(void);
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index f07a5e4..714e69c 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -29235,6 +29235,8 @@  cp_parser_omp_clause_name (cp_parser *parser)
 	    result = PRAGMA_OMP_CLAUSE_UNTIED;
 	  else if (!strcmp ("use_device_ptr", p))
 	    result = PRAGMA_OMP_CLAUSE_USE_DEVICE_PTR;
+	  else if (!strcmp ("use_device", p))
+	    result = PRAGMA_OACC_CLAUSE_USE_DEVICE;
 	  break;
 	case 'v':
 	  if (!strcmp ("vector_length", p))
@@ -31381,6 +31383,11 @@  cp_parser_oacc_all_clauses (cp_parser *parser, omp_clause_mask mask,
 	  clauses = cp_parser_oacc_data_clause (parser, c_kind, clauses);
 	  c_name = "self";
 	  break;
+	case PRAGMA_OACC_CLAUSE_USE_DEVICE:
+	  clauses = cp_parser_omp_var_list (parser, OMP_CLAUSE_USE_DEVICE,
+					    clauses);
+	  c_name = "use_device";
+	  break;
 	case PRAGMA_OACC_CLAUSE_VECTOR_LENGTH:
 	  clauses = cp_parser_oacc_clause_vector_length (parser, clauses);
 	  c_name = "vector_length";
@@ -34221,6 +34228,30 @@  cp_parser_oacc_data (cp_parser *parser, cp_token *pragma_tok)
   return stmt;
 }
 
+#define OACC_HOST_DATA_CLAUSE_MASK					\
+  ( (OMP_CLAUSE_MASK_1 << PRAGMA_OACC_CLAUSE_USE_DEVICE) )
+
+/* OpenACC 2.0:
+  # pragma acc host_data <clauses> new-line
+  structured-block  */
+
+static tree
+cp_parser_oacc_host_data (cp_parser *parser, cp_token *pragma_tok)
+{
+  tree stmt, clauses, block;
+  unsigned int save;
+
+  clauses = cp_parser_oacc_all_clauses (parser, OACC_HOST_DATA_CLAUSE_MASK,
+					"#pragma acc host_data", pragma_tok);
+
+  block = begin_omp_parallel ();
+  save = cp_parser_begin_omp_structured_block (parser);
+  cp_parser_statement (parser, NULL_TREE, false, NULL);
+  cp_parser_end_omp_structured_block (parser, save);
+  stmt = finish_oacc_host_data (clauses, block);
+  return stmt;
+}
+
 /* OpenACC 2.0:
    # pragma acc enter data oacc-enter-data-clause[optseq] new-line
 
@@ -35288,6 +35319,9 @@  cp_parser_omp_construct (cp_parser *parser, cp_token *pragma_tok)
     case PRAGMA_OACC_EXIT_DATA:
       stmt = cp_parser_oacc_enter_exit_data (parser, pragma_tok, false);
       break;
+    case PRAGMA_OACC_HOST_DATA:
+      stmt = cp_parser_oacc_host_data (parser, pragma_tok);
+      break;
     case PRAGMA_OACC_KERNELS:
       stmt = cp_parser_oacc_kernels (parser, pragma_tok);
       break;
@@ -35856,6 +35890,7 @@  cp_parser_pragma (cp_parser *parser, enum pragma_context context)
     case PRAGMA_OACC_DATA:
     case PRAGMA_OACC_ENTER_DATA:
     case PRAGMA_OACC_EXIT_DATA:
+    case PRAGMA_OACC_HOST_DATA:
     case PRAGMA_OACC_KERNELS:
     case PRAGMA_OACC_PARALLEL:
     case PRAGMA_OACC_LOOP:
diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index c0a8b32..25482e7 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -6689,6 +6689,7 @@  finish_omp_clauses (tree clauses, bool allow_fields, bool declare_simd)
 	case OMP_CLAUSE_SIMD:
 	case OMP_CLAUSE_DEFAULTMAP:
 	case OMP_CLAUSE__CILK_FOR_COUNT_:
+	case OMP_CLAUSE_USE_DEVICE:
 	  break;
 
 	case OMP_CLAUSE_INBRANCH:
@@ -7119,6 +7120,24 @@  finish_oacc_data (tree clauses, tree block)
   return add_stmt (stmt);
 }
 
+/* Generate OACC_HOST_DATA, with CLAUSES and BLOCK as its compound
+   statement.  */
+
+tree
+finish_oacc_host_data (tree clauses, tree block)
+{
+  tree stmt;
+
+  block = finish_omp_structured_block (block);
+
+  stmt = make_node (OACC_HOST_DATA);
+  TREE_TYPE (stmt) = void_type_node;
+  OACC_HOST_DATA_CLAUSES (stmt) = clauses;
+  OACC_HOST_DATA_BODY (stmt) = block;
+
+  return add_stmt (stmt);
+}
+
 /* Generate OACC_KERNELS, with CLAUSES and BLOCK as its compound
    statement.  LOC is the location of the OACC_KERNELS.  */