[PATCH 3/9] c-family: Add debug_annotate attribute handlers

[David Faust <david.faust@oracle.com>]

This patch adds attribute handlers for two new attributes:
"debug_annotate_decl" and "debug_annotate_type". Both attributes accept
a single string argument, and are used to add arbitrary annotations to
debug information generated for the decls or types to which they apply.

gcc/c-family/

	* c-attribs.cc (c_common_attribute_table): Add new attributes
	debug_annotate_decl and debug_annotate_type.
	(handle_debug_annotate_decl_attribute): New.
	(handle_debug_annotate_type_attribute): Likewise.
---
 gcc/c-family/c-attribs.cc | 43 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/gcc/c-family/c-attribs.cc b/gcc/c-family/c-attribs.cc
index c8d96723f4c..50e8fc1b695 100644
--- a/gcc/c-family/c-attribs.cc
+++ b/gcc/c-family/c-attribs.cc
@@ -174,6 +174,9 @@ static tree handle_signed_bool_precision_attribute (tree *, tree, tree, int,
 						    bool *);
 static tree handle_retain_attribute (tree *, tree, tree, int, bool *);
 
+static tree handle_debug_annotate_decl_attribute (tree *, tree, tree, int, bool *);
+static tree handle_debug_annotate_type_attribute (tree *, tree, tree, int, bool *);
+
 /* Helper to define attribute exclusions.  */
 #define ATTR_EXCL(name, function, type, variable)	\
   { name, function, type, variable }
@@ -555,6 +558,10 @@ const struct attribute_spec c_common_attribute_table[] =
 			      handle_dealloc_attribute, NULL },
   { "tainted_args",	      0, 0, true,  false, false, false,
 			      handle_tainted_args_attribute, NULL },
+  { "debug_annotate_decl",    1, 1, false, false, false, false,
+			      handle_debug_annotate_decl_attribute, NULL },
+  { "debug_annotate_type",    1, 1, false, true, false, false,
+			      handle_debug_annotate_type_attribute, NULL },
   { NULL,                     0, 0, false, false, false, false, NULL, NULL }
 };
 
@@ -5868,6 +5875,42 @@ handle_tainted_args_attribute (tree *node, tree name, tree, int,
   return NULL_TREE;
 }
 
+/* Handle a "debug_annotate_decl" attribute; arguments as in
+   struct attribute_spec.handler.   */
+
+static tree
+handle_debug_annotate_decl_attribute (tree *, tree name, tree args, int,
+				      bool *no_add_attrs)
+{
+  if (!args)
+    *no_add_attrs = true;
+  else if (TREE_CODE (TREE_VALUE (args)) != STRING_CST)
+    {
+      error ("%qE attribute requires a string", name);
+      *no_add_attrs = true;
+    }
+
+  return NULL_TREE;
+}
+
+/* Handle a "debug_annotate_type" attribute; arguments as in
+   struct attribute_spec.handler.   */
+
+static tree
+handle_debug_annotate_type_attribute (tree *, tree name, tree args, int,
+				      bool *no_add_attrs)
+{
+  if (!args)
+    *no_add_attrs = true;
+  else if (TREE_CODE (TREE_VALUE (args)) != STRING_CST)
+    {
+      error ("%qE attribute requires a string", name);
+      *no_add_attrs = true;
+    }
+
+  return NULL_TREE;
+}
+
 /* Attempt to partially validate a single attribute ATTR as if
    it were to be applied to an entity OPER.  */
 
-- 
2.36.1