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1 | (* |
2 | * Copyright 2005-2009, Ecole des Mines de Nantes, University of Copenhagen | |
3 | * Yoann Padioleau, Julia Lawall, Rene Rydhof Hansen, Henrik Stuart, Gilles Muller, Nicolas Palix | |
4 | * This file is part of Coccinelle. | |
5 | * | |
6 | * Coccinelle is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, according to version 2 of the License. | |
9 | * | |
10 | * Coccinelle is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with Coccinelle. If not, see <http://www.gnu.org/licenses/>. | |
17 | * | |
18 | * The authors reserve the right to distribute this or future versions of | |
19 | * Coccinelle under other licenses. | |
20 | *) | |
21 | ||
22 | ||
34e49164 | 23 | module V0 = Visitor_ast0 |
b1b2de81 | 24 | module VT0 = Visitor_ast0_types |
34e49164 C |
25 | module Ast0 = Ast0_cocci |
26 | module Ast = Ast_cocci | |
27 | ||
28 | (* Detects where position variables can be present in the match of an | |
29 | isomorpshims. This is allowed if all elements of an isomorphism have only | |
30 | one token or if we can somehow match up equal tokens of all of the | |
31 | isomorphic variants. *) | |
32 | ||
33 | let sequence_tokens = | |
34 | let mcode x = | |
35 | (* sort of unpleasant to convert the token representation to a string | |
36 | but we can't make a list of mcodes otherwise because the types are all | |
37 | different *) | |
38 | [(Common.dump (Ast0.unwrap_mcode x),Ast0.get_pos_ref x)] in | |
39 | let donothing r k e = k e in | |
40 | let bind x y = x @ y in | |
41 | let option_default = [] in | |
b1b2de81 | 42 | V0.flat_combiner bind option_default |
34e49164 | 43 | mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode |
34e49164 C |
44 | donothing donothing donothing donothing donothing donothing |
45 | donothing donothing | |
46 | donothing donothing donothing donothing donothing donothing donothing | |
47 | ||
48 | (* In general, we will get a list of lists: | |
49 | ||
50 | [[tokens1;tokens2;tokens3];[tokens4;tokens5;tokens6];[tokens7;tokens8]] | |
51 | ||
52 | If all of the lists tokens contain only one element, we are done. | |
53 | ||
54 | Otherwise, we focus on tokens1. For each of its elements, if they are | |
55 | present in all of the others, then a position is assigned, and if not then | |
56 | a position is not. The order of the elements in the other lists is | |
57 | irrelevant; we just take the first unannotated element that matches. Once | |
58 | we are done with the elements of tokens1, we skip to tokens 4 and repeat, | |
59 | including considering the one-element special case. *) | |
60 | ||
61 | let pctr = ref 0 | |
62 | let get_p _ = | |
63 | let c = !pctr in | |
64 | pctr := c + 1; | |
65 | let name = ("",Printf.sprintf "p%d" c) in | |
66 | Ast0.MetaPos(Ast0.make_mcode name,[],Ast.PER) | |
67 | ||
68 | let process_info l = | |
69 | let rec loop = function | |
70 | [] -> () | |
71 | | ((f::r)::xs) as a -> | |
72 | if List.for_all (List.for_all (function e -> List.length e = 1)) a | |
73 | then | |
74 | let p = get_p() in | |
75 | List.iter (List.iter (List.iter (function (_,pos) -> pos := p))) a | |
76 | else | |
77 | let all = r @ List.concat xs in | |
78 | let rec find_first_available a = function | |
79 | [] -> raise Not_found | |
80 | | (str,pos)::xs -> | |
81 | if str = a && !pos = Ast0.NoMetaPos | |
82 | then pos | |
83 | else find_first_available a xs in | |
84 | List.iter | |
85 | (function (str,pos) -> | |
86 | match !pos with | |
87 | Ast0.NoMetaPos -> | |
88 | (try | |
89 | let entries = List.map (find_first_available str) all in | |
90 | let p = get_p() in | |
91 | pos := p; | |
92 | List.iter (function pos -> pos := p) entries | |
93 | with Not_found -> ()) | |
94 | | _ -> (* already have a variable *) ()) | |
95 | f; | |
96 | loop xs | |
97 | | _ -> failwith "bad iso" in | |
98 | loop l | |
99 | ||
100 | (* Entry point *) | |
101 | ||
102 | let process (metavars,alts,name) = | |
103 | let toks = | |
b1b2de81 | 104 | List.map (List.map sequence_tokens.VT0.combiner_rec_anything) alts in |
34e49164 | 105 | process_info toks |