* attribs.c (c_common_attribute_table): Add visibility.

	(handle_visibility_attribute): New function.
	* varasm.c (assemble_visibility): New function.
	* output.h (assemble_visibility): Add prototype.
	* tree.h (MODULE_LOCAL_P): Define.
	* crtstuff.c (__dso_handle): Use visibility attribute.
	* config/i386/i386.h (ENCODE_SECTION_INFO): Set SYMBOL_REF_FLAG
	for MODULE_LOCAL_P symbols too.
	* config/ia64/ia64.c (ia64_encode_section_info): Handle
	MODULE_LOCAL_P symbols the same way as local symbols.
	Add SDATA_NAME_FLAG_CHAR even if decl was explicitely forced
	into .sdata/.sbss by the user.
	* doc/extend.texi (Function Attributes): Document visibility
	attribute.

	* gcc.dg/ia64-visibility-1.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@50061 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 48 insertions, 0 deletions

diff --git a/gcc/attribs.c b/gcc/attribs.c
index d046a6242ba..2879d100a30 100644
--- a/gcc/attribs.c
+++ b/gcc/attribs.c
@@ -75,6 +75,8 @@ static tree handle_weak_attribute	PARAMS ((tree *, tree, tree, int,
 						 bool *));
 static tree handle_alias_attribute	PARAMS ((tree *, tree, tree, int,
 						 bool *));
+static tree handle_visibility_attribute	PARAMS ((tree *, tree, tree, int,
+						 bool *));
 static tree handle_no_instrument_function_attribute PARAMS ((tree *, tree,
 							     tree, int,
 							     bool *));
@@ -148,6 +150,8 @@ static const struct attribute_spec c_common_attribute_table[] =
 			      handle_deprecated_attribute },
   { "vector_size",	      1, 1, false, true, false,
 			      handle_vector_size_attribute },
+  { "visibility",	      1, 1, true,  false, false,
+			      handle_visibility_attribute },
   { NULL,                     0, 0, false, false, false, NULL }
 };
 
@@ -1061,6 +1065,50 @@ handle_alias_attribute (node, name, args, flags, no_add_attrs)
   return NULL_TREE;
 }
 
+/* Handle an "visibility" attribute; arguments as in
+   struct attribute_spec.handler.  */
+
+static tree
+handle_visibility_attribute (node, name, args, flags, no_add_attrs)
+     tree *node;
+     tree name;
+     tree args;
+     int flags ATTRIBUTE_UNUSED;
+     bool *no_add_attrs;
+{
+  tree decl = *node;
+
+  if (decl_function_context (decl) != 0 || ! TREE_PUBLIC (decl))
+    {
+      warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
+      *no_add_attrs = true;
+    }
+  else
+    {
+      tree id;
+
+      id = TREE_VALUE (args);
+      if (TREE_CODE (id) != STRING_CST)
+	{
+	  error ("visibility arg not a string");
+	  *no_add_attrs = true;
+	  return NULL_TREE;
+	}
+      if (strcmp (TREE_STRING_POINTER (id), "hidden")
+	  && strcmp (TREE_STRING_POINTER (id), "protected")
+	  && strcmp (TREE_STRING_POINTER (id), "internal"))
+	{
+	  error ("visibility arg must be one of \"hidden\", \"protected\" or \"internal\"");
+	  *no_add_attrs = true;
+	  return NULL_TREE;
+	}
+
+      assemble_visibility (decl, TREE_STRING_POINTER (id));
+    }
+
+  return NULL_TREE;
+}
+
 /* Handle a "no_instrument_function" attribute; arguments as in
    struct attribute_spec.handler.  */