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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 C |
23 | module Ast0 = Ast0_cocci |
24 | module Ast = Ast_cocci | |
25 | module V0 = Visitor_ast0 | |
b1b2de81 | 26 | module VT0 = Visitor_ast0_types |
34e49164 C |
27 | |
28 | (* find assignments that can match an initialization *) | |
29 | ||
30 | let pure_mcodekind = function | |
31 | Ast0.CONTEXT(mc) -> | |
32 | (match !mc with | |
33 | (Ast.NOTHING,_,_) -> true | |
34 | | _ -> false) | |
35 | | _ -> false | |
36 | ||
37 | let is_simple_assign left op = | |
38 | (match Ast0.unwrap left with | |
39 | Ast0.Ident(_) | Ast0.MetaExpr(_,_,_,_,_) -> true | |
40 | | _ -> false) | |
41 | && | |
42 | ((Ast0.unwrap_mcode op) = Ast.SimpleAssign) | |
43 | ||
44 | let is_simple_ast_assign left op minus_left = | |
45 | (match Ast.unwrap left with | |
46 | Ast.Ident(_) -> true | |
47 | | Ast.MetaExpr(name,_,_,_,_,_) -> | |
48 | (match Ast0.unwrap minus_left with | |
49 | Ast0.MetaExpr(name1,_,_,_,_) -> | |
50 | Ast.unwrap_mcode name = Ast0.unwrap_mcode name1 | |
51 | | _ -> false) | |
52 | | _ -> false) | |
53 | && | |
54 | ((Ast.unwrap_mcode op) = Ast.SimpleAssign) | |
55 | ||
56 | let warning e msg = | |
57 | Common.pr2 | |
58 | ("the simple assignment expression on line "^ | |
59 | (string_of_int (Ast0.get_line e))^ | |
60 | " contains transformations\n"^ | |
61 | "that prevent it from matching a declaration ("^msg^")\n"); | |
62 | e | |
63 | ||
64 | let rebuild e1 left right op simple = | |
65 | Ast0.rewrap e1 (Ast0.Assignment(left,op,right,simple)) | |
66 | ||
67 | let rec exp mc e1 = | |
68 | match Ast0.unwrap e1 with | |
69 | Ast0.Assignment(left,op,right,_) -> | |
70 | if is_simple_assign left op | |
71 | then | |
72 | (if !Flag.sgrep_mode2 | |
73 | then rebuild e1 left right op true | |
74 | else | |
75 | match mc with | |
76 | Ast0.MINUS(mc) -> | |
77 | (match !mc with | |
78 | ([[Ast.ExpressionTag(e2)]],_) -> | |
79 | (match Ast.unwrap e2 with | |
80 | Ast.Assignment(left',op',_,_) -> | |
81 | if is_simple_ast_assign left' op' left | |
82 | then rebuild e1 left right op true | |
83 | else warning e1 "replacement is not simple" | |
84 | | _ -> warning e1 "replacement is not an assignment") | |
85 | | _ -> warning e1 "multiple replacements") | |
86 | | m -> | |
87 | let pure = | |
88 | (pure_mcodekind m) && | |
89 | (pure_mcodekind (Ast0.get_mcodekind left)) && | |
90 | (pure_mcodekind (Ast0.get_mcode_mcodekind op)) in | |
91 | if not pure | |
92 | then warning e1 "not pure" | |
93 | else rebuild e1 left right op pure) | |
94 | else e1 | |
95 | | Ast0.DisjExpr(lp,exps,mids,rp) -> | |
96 | Ast0.rewrap e1 | |
97 | (Ast0.DisjExpr | |
98 | (lp,List.map (function x -> exp (Ast0.get_mcodekind x) x) exps, | |
99 | mids,rp)) | |
100 | | Ast0.OptExp(e) -> | |
101 | Ast0.rewrap e1 (Ast0.OptExp(exp (Ast0.get_mcodekind e) e)) | |
102 | | Ast0.UniqueExp(e) -> | |
103 | Ast0.rewrap e1 (Ast0.UniqueExp(exp (Ast0.get_mcodekind e) e)) | |
104 | | _ -> e1 | |
105 | ||
106 | let simple_assignments l = | |
34e49164 C |
107 | let statement r k e = |
108 | match Ast0.unwrap e with | |
109 | Ast0.Exp(e1) -> Ast0.rewrap e (Ast0.Exp(exp (Ast0.get_mcodekind e) e1)) | |
110 | | _ -> k e in | |
111 | let fn = | |
112 | V0.rebuilder | |
b1b2de81 C |
113 | {V0.rebuilder_functions with VT0.rebuilder_stmtfn = statement} in |
114 | List.map fn.VT0.rebuilder_rec_top_level l |