[Cocci] [RFC PATCH 03/25] parsing_c: parsing_hacks: Commentize attributes before qualif/type

[Jaskaran Singh <jaskaransingh7654321@gmail.com>]

For the following example from fs/btrfs/ctree.h in Linux v5.6-rc7:

__cold __noreturn
static inline void assertfail(const char *expr, const char *file, int line)
{
	pr_err("assertion failed: %s, in %s:%d\n", expr, file, line);
	BUG();
}

__cold and __noreturn are not labeled correctly, leading to C parsing
errors. Add a case to commentize attributes before a storage
qualifier/type qualifier/type correctly.

Signed-off-by: Jaskaran Singh <jaskaransingh7654321@gmail.com>
---
 parsing_c/parsing_hacks.ml | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/parsing_c/parsing_hacks.ml b/parsing_c/parsing_hacks.ml
index 74c3ba60..0254fc7f 100644
--- a/parsing_c/parsing_hacks.ml
+++ b/parsing_c/parsing_hacks.ml
@@ -1952,6 +1952,29 @@ let is_type = function
   | Tshort _ -> true
   | _ -> false
 
+let is_type_qualif = function
+  | Tconst _
+  | Tvolatile _ -> true
+  | _ -> false
+
+let is_storage_spec = function
+  | Tstatic _
+  | Tregister _
+  | Textern _
+  | Tauto _ -> true
+  | _ -> false
+
+let rec is_idents ?(followed_by=fun _ -> true) ts =
+  let rec loop l =
+    match l with
+    | x::xs when ident x -> loop xs
+    | x::xs -> followed_by x
+    | [] -> failwith "unexpected end of token stream" in
+  match ts with
+  | x::xs when ident x -> loop xs
+  | x::xs -> followed_by x
+  | _ -> false
+
 let is_cparen = function (TCPar _) -> true | _ -> false
 let is_oparen = function (TOPar _) -> true | _ -> false
 
@@ -2134,6 +2157,16 @@ let lookahead2 ~pass next before =
 	  else
 	    TCommentCpp (Token_c.CppDirective, i1)
 
+	(* tt xx yy *)
+  | (TIdent (s, i1)::rest, _)
+    when not_struct_enum before
+	&& is_idents
+           ~followed_by:
+             (function x ->
+                is_type x || is_storage_spec x || is_type_qualif x) rest
+        && s ==~ regexp_annot ->
+	    TCommentCpp (Token_c.CppMacro, i1)
+
   | (TIdent (s2, i2)::_  , TIdent (s, i1)::seen::_)
     when not_struct_enum before
 	&& is_macro s2 && is_type seen ->
-- 
2.21.1

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