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1 | (* |
2 | * Copyright 2010, INRIA, University of Copenhagen | |
3 | * Julia Lawall, Rene Rydhof Hansen, Gilles Muller, Nicolas Palix | |
4 | * Copyright 2005-2009, Ecole des Mines de Nantes, University of Copenhagen | |
5 | * Yoann Padioleau, Julia Lawall, Rene Rydhof Hansen, Henrik Stuart, Gilles Muller, Nicolas Palix | |
6 | * This file is part of Coccinelle. | |
7 | * | |
8 | * Coccinelle is free software: you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation, according to version 2 of the License. | |
11 | * | |
12 | * Coccinelle is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with Coccinelle. If not, see <http://www.gnu.org/licenses/>. | |
19 | * | |
20 | * The authors reserve the right to distribute this or future versions of | |
21 | * Coccinelle under other licenses. | |
22 | *) | |
23 | ||
24 | ||
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25 | (* two goals: first drop from the environments things that are not used, |
26 | and second prompt for the names of fresh variables that are used *) | |
27 | ||
28 | (* have to add in the whole inherited env because inherited variables are | |
29 | not returned by get_fvs. It would be better if that were the case, but | |
30 | since at the moment I think we can only inherit one value per variable, | |
31 | perhaps it doesn't matter - these bindings will always be the same no matter | |
32 | how we reached a particular match *) | |
33 | ||
34 | module Ast = Ast_cocci | |
35 | ||
36 | let extra_counter = ref 0 | |
37 | let get_extra _ = | |
38 | let ctr = !extra_counter in | |
39 | extra_counter := !extra_counter + 1; | |
40 | "__extra_counter__"^(string_of_int ctr) | |
41 | ||
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42 | let get_seeded seed = |
43 | let ctr = !extra_counter in | |
44 | extra_counter := !extra_counter + 1; | |
45 | seed^(string_of_int ctr) | |
46 | ||
47 | let read_fresh_id _ = | |
ae4735db | 48 | try |
34e49164 | 49 | let s = read_line () in |
485bce71 | 50 | match Parse_c.tokens_of_string s with |
34e49164 | 51 | [Parser_c.TIdent _; Parser_c.EOF _] -> s |
b1b2de81 | 52 | | [Parser_c.EOF _] -> get_extra() |
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53 | | _ -> failwith ("wrong fresh id: " ^ s) |
54 | with End_of_file -> get_extra() | |
55 | ||
56 | let get_vars = function | |
57 | Lib_engine.Match(re) -> (Ast.get_fvs re, Ast.get_fresh re) | |
58 | | _ -> ([],[]) | |
59 | ||
5636bb2c | 60 | let string2val str = Lib_engine.NormalMetaVal(Ast_c.MetaIdVal(str,[])) |
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61 | |
62 | (* ----------------------------------------------------------------------- *) | |
63 | (* Get values for fresh variables *) | |
64 | ||
65 | let process_tree inherited_env l = | |
66 | let (all_fresh,local_freshs,new_triples) = | |
67 | List.fold_left | |
68 | (function (all_fresh,local_freshs,new_triples) -> | |
69 | function (node,env,pred) -> | |
70 | let (other,fresh) = get_vars pred in | |
71 | let env = List.filter (function (x,_) -> List.mem x other) env in | |
72 | (Common.union_set fresh all_fresh, | |
73 | fresh::local_freshs, | |
74 | (node,env@inherited_env,pred)::new_triples)) | |
75 | ([],[],[]) l in | |
76 | let local_freshs = List.rev local_freshs in | |
77 | let new_triples = List.rev new_triples in | |
78 | let fresh_env = | |
79 | List.map | |
b1b2de81 | 80 | (function |
978fd7e5 | 81 | ((r,n) as fresh,Ast.NoVal) -> |
b1b2de81 C |
82 | Printf.printf "%s: name for %s: " r n; (* not debugging code!!! *) |
83 | flush stdout; | |
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84 | (fresh,let v = string2val(read_fresh_id()) in function _ -> v) |
85 | | ((r,n) as fresh,Ast.StringSeed seed) -> | |
86 | (fresh,let v = string2val(get_seeded seed) in function _ -> v) | |
87 | | ((r,n) as fresh,Ast.ListSeed seed) -> | |
88 | (fresh, | |
89 | function env -> | |
90 | let strings = | |
91 | List.map | |
92 | (function | |
93 | Ast.SeedString s -> s | |
94 | | Ast.SeedId id -> | |
95 | try | |
96 | (match List.assoc id env with | |
5636bb2c | 97 | Lib_engine.NormalMetaVal(Ast_c.MetaIdVal(str,_)) -> |
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98 | str |
99 | | _ -> failwith "bad id value") | |
100 | with | |
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101 | Not_found -> |
102 | failwith | |
103 | ("fresh: no binding for meta "^(Dumper.dump id))) | |
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104 | seed in |
105 | string2val(String.concat "" strings))) | |
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106 | all_fresh in |
107 | let (_,res) = | |
108 | List.split | |
109 | (List.fold_left | |
110 | (function freshs_node_env_preds -> | |
978fd7e5 | 111 | function (fresh,fn) -> |
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112 | List.map |
113 | (function (freshs,((node,env,pred) as cur)) -> | |
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114 | try |
115 | let _ = List.assoc fresh freshs in | |
978fd7e5 | 116 | (freshs,(node,(fresh,fn env)::env,pred)) |
b1b2de81 | 117 | with Not_found -> (freshs,cur)) |
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118 | freshs_node_env_preds) |
119 | (List.combine local_freshs new_triples) | |
120 | fresh_env) in | |
121 | (List.rev res, fresh_env) | |
122 | ||
123 | (* ----------------------------------------------------------------------- *) | |
124 | (* Create the environment to be used afterwards *) | |
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125 | (* anything that a used after fresh variable refers to has to have a unique |
126 | value, by virtue of the placement of the quantifier. thus we augment | |
127 | inherited env with the first element of l, if any *) | |
128 | ||
129 | let collect_used_after used_after envs l inherited_env = | |
130 | List.map2 | |
131 | (function env -> function l -> | |
132 | let inherited_env = | |
133 | match l with | |
134 | [] -> inherited_env | |
135 | | (_,fse,_)::_ -> | |
136 | (* l represents the result from a single tree. fse is a complete | |
137 | environment in that tree. for a fresh seed, the environments | |
138 | for all leaves contain the same information *) | |
139 | fse@inherited_env in | |
140 | List.map | |
141 | (function (v,vl) -> (v,vl inherited_env)) | |
142 | (List.filter (function (v,vl) -> List.mem v used_after) env)) | |
143 | envs l | |
34e49164 | 144 | |
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145 | (* ----------------------------------------------------------------------- *) |
146 | (* distinguish between distinct witness trees, each gets an index n *) | |
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147 | (* index should be global, so that it can extend over environments *) |
148 | ||
149 | let index = ref (-1) | |
150 | ||
151 | let fold_left_with_index f acc = | |
152 | let rec fold_lwi_aux acc = function | |
153 | | [] -> acc | |
154 | | x::xs -> | |
155 | let n = !index in | |
156 | index := !index + 1; | |
157 | fold_lwi_aux (f acc x n) xs | |
158 | in fold_lwi_aux acc | |
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159 | |
160 | let numberify trees = | |
161 | let trees = | |
8babbc8f | 162 | fold_left_with_index |
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163 | (function acc -> function xs -> function n -> |
164 | (List.map (function x -> (n,x)) xs) @ acc) | |
165 | [] trees in | |
8babbc8f | 166 | List.fold_left |
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167 | (function res -> |
168 | function (n,x) -> | |
169 | let (same,diff) = List.partition (function (ns,xs) -> x = xs) res in | |
170 | match same with | |
171 | [(ns,xs)] -> (n::ns,xs)::diff | |
172 | | _ -> ([n],x)::res) | |
173 | [] trees | |
174 | ||
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175 | (* ----------------------------------------------------------------------- *) |
176 | (* entry point *) | |
177 | ||
178 | let process used_after inherited_env l = | |
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179 | let (trees, fresh_envs) = |
180 | List.split (List.map (process_tree inherited_env) l) in | |
708f4980 | 181 | let trees = numberify trees in |
978fd7e5 | 182 | (trees, collect_used_after used_after fresh_envs l inherited_env) |