Implement LWG2296 helper intrinsic c-family/

	Implement LWG2296 helper intrinsic
c-family/
	* c-common.h (enum rid): Add RID_ADDRESSOF.
	* c-common.c (c_common_reswords): Add __builtin_addressof.
cp/
	* parser.c (cp_parser_postfix_expression): Handle RID_ADDRESSOF.
	* cp-objcp-common.c (cp_common_init_ts): Handle ADDRESSOF_EXPR.
	* constexpr.c (potential_constant_expression_1): Likewise.
	* error.c (dump_expr): Likewise.
	* typeck.c (cp_build_addressof): New function.
	* cp-tree.h (cp_build_addressof): Declare.
	* cxx-pretty-print.h (pp_cxx_addressof_expression): Declare.
	* cp-tree.def (ADDRESSOF_EXPR): New tree code.
	* cxx-pretty-print.c (cxx_pretty_printer::primary_expression): Handle
	ADDRESSOF_EXPR.  Add __builtin_addressof and
	__has_unique_object_representations into syntax in function comment.
	(pp_cxx_addressof_expression): New function.
	* pt.c (tsubst_copy_and_build): Handle ADDRESSOF_EXPR.
testsuite/
	* g++.dg/cpp0x/addressof1.C: New test.
	* g++.dg/cpp0x/addressof2.C: New test.

From-SVN: r240873

11 files changed, 102 insertions, 13 deletions

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 085e0a5..ce875ce 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,20 @@
+2016-10-07  Jakub Jelinek  <jakub@redhat.com>
+
+	Implement LWG2296 helper intrinsic
+	* parser.c (cp_parser_postfix_expression): Handle RID_ADDRESSOF.
+	* cp-objcp-common.c (cp_common_init_ts): Handle ADDRESSOF_EXPR.
+	* constexpr.c (potential_constant_expression_1): Likewise.
+	* error.c (dump_expr): Likewise.
+	* typeck.c (cp_build_addressof): New function.
+	* cp-tree.h (cp_build_addressof): Declare.
+	* cxx-pretty-print.h (pp_cxx_addressof_expression): Declare.
+	* cp-tree.def (ADDRESSOF_EXPR): New tree code.
+	* cxx-pretty-print.c (cxx_pretty_printer::primary_expression): Handle
+	ADDRESSOF_EXPR.  Add __builtin_addressof and
+	__has_unique_object_representations into syntax in function comment.
+	(pp_cxx_addressof_expression): New function.
+	* pt.c (tsubst_copy_and_build): Handle ADDRESSOF_EXPR.
+
 2016-10-07  Bernd Edlinger  <bernd.edlinger@hotmail.de>
 
 	PR c++/77700
diff --git a/gcc/cp/constexpr.c b/gcc/cp/constexpr.c
index 4acbb26..f5235fc 100644
--- a/gcc/cp/constexpr.c
+++ b/gcc/cp/constexpr.c
@@ -5025,6 +5025,11 @@ potential_constant_expression_1 (tree t, bool want_rval, bool strict,
         return (RECUR (from, TREE_CODE (t) != VIEW_CONVERT_EXPR));
       }
 
+    case ADDRESSOF_EXPR:
+      /* This is like ADDR_EXPR, except it won't form pointer-to-member.  */
+      t = TREE_OPERAND (t, 0);
+      goto handle_addr_expr;
+
     case ADDR_EXPR:
       /* -- a unary operator & that is applied to an lvalue that
             designates an object with thread or automatic storage
@@ -5035,6 +5040,7 @@ potential_constant_expression_1 (tree t, bool want_rval, bool strict,
 	/* A pointer-to-member constant.  */
 	return true;
 
+    handle_addr_expr:
 #if 0
       /* FIXME adjust when issue 1197 is fully resolved.  For now don't do
          any checking here, as we might dereference the pointer later.  If
diff --git a/gcc/cp/cp-objcp-common.c b/gcc/cp/cp-objcp-common.c
index 9cb9dd7..ac1bb63 100644
--- a/gcc/cp/cp-objcp-common.c
+++ b/gcc/cp/cp-objcp-common.c
@@ -315,6 +315,7 @@ cp_common_init_ts (void)
   MARK_TS_TYPED (STMT_EXPR);
   MARK_TS_TYPED (OFFSET_REF);
   MARK_TS_TYPED (OFFSETOF_EXPR);
+  MARK_TS_TYPED (ADDRESSOF_EXPR);
   MARK_TS_TYPED (PTRMEM_CST);
   MARK_TS_TYPED (EMPTY_CLASS_EXPR);
   MARK_TS_TYPED (VEC_INIT_EXPR);
diff --git a/gcc/cp/cp-tree.def b/gcc/cp/cp-tree.def
index 6cb5a69..9e44076 100644
--- a/gcc/cp/cp-tree.def
+++ b/gcc/cp/cp-tree.def
@@ -334,6 +334,11 @@ DEFTREECODE (TAG_DEFN, "tag_defn", tcc_expression, 0)
 /* Represents an 'offsetof' expression during template expansion.  */
 DEFTREECODE (OFFSETOF_EXPR, "offsetof_expr", tcc_expression, 1)
 
+/* Represents an '__builtin_addressof' expression during template
+   expansion.  This is similar to ADDR_EXPR, but it doesn't invoke
+   overloaded & operators.  */
+DEFTREECODE (ADDRESSOF_EXPR, "addressof_expr", tcc_expression, 1)
+
 /* Represents the -> operator during template expansion.  */
 DEFTREECODE (ARROW_EXPR, "arrow_expr", tcc_expression, 1)
 
diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
index 9282bbe..6a08627 100644
--- a/gcc/cp/cp-tree.h
+++ b/gcc/cp/cp-tree.h
@@ -6658,6 +6658,8 @@ extern tree build_x_array_ref			(location_t, tree, tree,
 extern tree build_x_unary_op			(location_t,
 						 enum tree_code, cp_expr,
                                                  tsubst_flags_t);
+extern tree cp_build_addressof			(location_t, tree,
+						 tsubst_flags_t);
 extern tree cp_build_addr_expr			(tree, tsubst_flags_t);
 extern tree cp_build_unary_op                   (enum tree_code, tree, bool,
                                                  tsubst_flags_t);
diff --git a/gcc/cp/cxx-pretty-print.c b/gcc/cp/cxx-pretty-print.c
index 68dcf58..5157fab 100644
--- a/gcc/cp/cxx-pretty-print.c
+++ b/gcc/cp/cxx-pretty-print.c
@@ -380,6 +380,7 @@ pp_cxx_userdef_literal (cxx_pretty_printer *pp, tree t)
    GNU Extensions:
      __builtin_va_arg ( assignment-expression , type-id )
      __builtin_offsetof ( type-id, offsetof-expression )
+     __builtin_addressof ( expression )
 
      __has_nothrow_assign ( type-id )   
      __has_nothrow_constructor ( type-id )
@@ -387,6 +388,7 @@ pp_cxx_userdef_literal (cxx_pretty_printer *pp, tree t)
      __has_trivial_assign ( type-id )   
      __has_trivial_constructor ( type-id )
      __has_trivial_copy ( type-id )
+     __has_unique_object_representations ( type-id )
      __has_trivial_destructor ( type-id )
      __has_virtual_destructor ( type-id )     
      __is_abstract ( type-id )
@@ -456,6 +458,10 @@ cxx_pretty_printer::primary_expression (tree t)
       pp_cxx_offsetof_expression (this, t);
       break;
 
+    case ADDRESSOF_EXPR:
+      pp_cxx_addressof_expression (this, t);
+      break;
+
     case REQUIRES_EXPR:
       pp_cxx_requires_expr (this, t);
       break;
@@ -2437,6 +2443,15 @@ pp_cxx_offsetof_expression (cxx_pretty_printer *pp, tree t)
   pp_cxx_right_paren (pp);
 }
 
+void
+pp_cxx_addressof_expression (cxx_pretty_printer *pp, tree t)
+{
+  pp_cxx_ws_string (pp, "__builtin_addressof");
+  pp_cxx_left_paren (pp);
+  pp->expression (TREE_OPERAND (t, 0));
+  pp_cxx_right_paren (pp);
+}
+
 static char const*
 get_fold_operator (tree t)
 {
diff --git a/gcc/cp/cxx-pretty-print.h b/gcc/cp/cxx-pretty-print.h
index 2f0e35a..1eb55df 100644
--- a/gcc/cp/cxx-pretty-print.h
+++ b/gcc/cp/cxx-pretty-print.h
@@ -90,6 +90,7 @@ void pp_cxx_canonical_template_parameter (cxx_pretty_printer *, tree);
 void pp_cxx_trait_expression (cxx_pretty_printer *, tree);
 void pp_cxx_va_arg_expression (cxx_pretty_printer *, tree);
 void pp_cxx_offsetof_expression (cxx_pretty_printer *, tree);
+void pp_cxx_addressof_expression (cxx_pretty_printer *, tree);
 void pp_cxx_userdef_literal (cxx_pretty_printer *, tree);
 void pp_cxx_requires_clause (cxx_pretty_printer *, tree);
 void pp_cxx_requires_expr (cxx_pretty_printer *, tree);
diff --git a/gcc/cp/error.c b/gcc/cp/error.c
index 20b20b4..4cf0041 100644
--- a/gcc/cp/error.c
+++ b/gcc/cp/error.c
@@ -2678,6 +2678,10 @@ dump_expr (cxx_pretty_printer *pp, tree t, int flags)
       pp_cxx_offsetof_expression (pp, t);
       break;
 
+    case ADDRESSOF_EXPR:
+      pp_cxx_addressof_expression (pp, t);
+      break;
+
     case SCOPE_REF:
       dump_decl (pp, t, flags);
       break;
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 8728991..643c1e7 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -6602,6 +6602,7 @@ cp_parser_postfix_expression (cp_parser *parser, bool address_p, bool cast_p,
 	break;
       }
 
+    case RID_ADDRESSOF:
     case RID_BUILTIN_SHUFFLE:
       {
 	vec<tree, va_gc> *vec;
@@ -6618,19 +6619,29 @@ cp_parser_postfix_expression (cp_parser *parser, bool address_p, bool cast_p,
 	FOR_EACH_VEC_ELT (*vec, i, p)
 	  mark_exp_read (p);
 
-	if (vec->length () == 2)
-	  return build_x_vec_perm_expr (loc, (*vec)[0], NULL_TREE, (*vec)[1],
-					 tf_warning_or_error);
-	else if (vec->length () == 3)
-	  return build_x_vec_perm_expr (loc, (*vec)[0], (*vec)[1], (*vec)[2],
-					 tf_warning_or_error);
-	else
-	{
-	  error_at (loc, "wrong number of arguments to "
-	      "%<__builtin_shuffle%>");
-	  return error_mark_node;
-	}
-	break;
+	switch (keyword)
+	  {
+	  case RID_ADDRESSOF:
+	    if (vec->length () == 1)
+	      return cp_build_addressof (loc, (*vec)[0], tf_warning_or_error);
+	    error_at (loc, "wrong number of arguments to "
+			   "%<__builtin_addressof%>");
+	    return error_mark_node;
+
+	  case RID_BUILTIN_SHUFFLE:
+	    if (vec->length () == 2)
+	      return build_x_vec_perm_expr (loc, (*vec)[0], NULL_TREE,
+					    (*vec)[1], tf_warning_or_error);
+	    else if (vec->length () == 3)
+	      return build_x_vec_perm_expr (loc, (*vec)[0], (*vec)[1],
+					    (*vec)[2], tf_warning_or_error);
+	    error_at (loc, "wrong number of arguments to "
+			   "%<__builtin_shuffle%>");
+	    return error_mark_node;
+
+	  default:
+	    gcc_unreachable ();
+	  }
       }
 
     default:
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index e6bacdf..f6cd3ea 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -17204,6 +17204,10 @@ tsubst_copy_and_build (tree t,
       RETURN (finish_offsetof (RECUR (TREE_OPERAND (t, 0)),
 			       EXPR_LOCATION (t)));
 
+    case ADDRESSOF_EXPR:
+      RETURN (cp_build_addressof (EXPR_LOCATION (t),
+				  RECUR (TREE_OPERAND (t, 0)), complain));
+
     case TRAIT_EXPR:
       {
 	tree type1 = tsubst (TRAIT_EXPR_TYPE1 (t), args,
diff --git a/gcc/cp/typeck.c b/gcc/cp/typeck.c
index f1abb40..6456269 100644
--- a/gcc/cp/typeck.c
+++ b/gcc/cp/typeck.c
@@ -5456,6 +5456,29 @@ build_x_unary_op (location_t loc, enum tree_code code, cp_expr xarg,
   return exp;
 }
 
+/* Construct and perhaps optimize a tree representation
+   for __builtin_addressof operation.  ARG specifies the operand.  */
+
+tree
+cp_build_addressof (location_t loc, tree arg, tsubst_flags_t complain)
+{
+  tree orig_expr = arg;
+
+  if (processing_template_decl)
+    {
+      if (type_dependent_expression_p (arg))
+	return build_min_nt_loc (loc, ADDRESSOF_EXPR, arg, NULL_TREE);
+
+      arg = build_non_dependent_expr (arg);
+    }
+
+  tree exp = cp_build_addr_expr_strict (arg, complain);
+
+  if (processing_template_decl && exp != error_mark_node)
+    exp = build_min_non_dep (ADDRESSOF_EXPR, exp, orig_expr, NULL_TREE);
+  return exp;
+}
+
 /* Like c_common_truthvalue_conversion, but handle pointer-to-member
    constants, where a null value is represented by an INTEGER_CST of
    -1.  */