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34e49164 C |
1 | (* two goals: first drop from the environments things that are not used, |
2 | and second prompt for the names of fresh variables that are used *) | |
3 | ||
4 | (* have to add in the whole inherited env because inherited variables are | |
5 | not returned by get_fvs. It would be better if that were the case, but | |
6 | since at the moment I think we can only inherit one value per variable, | |
7 | perhaps it doesn't matter - these bindings will always be the same no matter | |
8 | how we reached a particular match *) | |
9 | ||
10 | module Ast = Ast_cocci | |
11 | ||
12 | let extra_counter = ref 0 | |
13 | let get_extra _ = | |
14 | let ctr = !extra_counter in | |
15 | extra_counter := !extra_counter + 1; | |
16 | "__extra_counter__"^(string_of_int ctr) | |
17 | ||
b1b2de81 C |
18 | let get_seeded seed = |
19 | let ctr = !extra_counter in | |
20 | extra_counter := !extra_counter + 1; | |
21 | seed^(string_of_int ctr) | |
22 | ||
23 | let read_fresh_id _ = | |
34e49164 C |
24 | try |
25 | let s = read_line () in | |
485bce71 | 26 | match Parse_c.tokens_of_string s with |
34e49164 | 27 | [Parser_c.TIdent _; Parser_c.EOF _] -> s |
b1b2de81 | 28 | | [Parser_c.EOF _] -> get_extra() |
34e49164 C |
29 | | _ -> failwith ("wrong fresh id: " ^ s) |
30 | with End_of_file -> get_extra() | |
31 | ||
32 | let get_vars = function | |
33 | Lib_engine.Match(re) -> (Ast.get_fvs re, Ast.get_fresh re) | |
34 | | _ -> ([],[]) | |
35 | ||
36 | let string2val str = Lib_engine.NormalMetaVal(Ast_c.MetaIdVal(str)) | |
37 | ||
38 | (* ----------------------------------------------------------------------- *) | |
39 | (* Get values for fresh variables *) | |
40 | ||
41 | let process_tree inherited_env l = | |
42 | let (all_fresh,local_freshs,new_triples) = | |
43 | List.fold_left | |
44 | (function (all_fresh,local_freshs,new_triples) -> | |
45 | function (node,env,pred) -> | |
46 | let (other,fresh) = get_vars pred in | |
47 | let env = List.filter (function (x,_) -> List.mem x other) env in | |
48 | (Common.union_set fresh all_fresh, | |
49 | fresh::local_freshs, | |
50 | (node,env@inherited_env,pred)::new_triples)) | |
51 | ([],[],[]) l in | |
52 | let local_freshs = List.rev local_freshs in | |
53 | let new_triples = List.rev new_triples in | |
54 | let fresh_env = | |
55 | List.map | |
b1b2de81 | 56 | (function |
978fd7e5 | 57 | ((r,n) as fresh,Ast.NoVal) -> |
b1b2de81 C |
58 | Printf.printf "%s: name for %s: " r n; (* not debugging code!!! *) |
59 | flush stdout; | |
978fd7e5 C |
60 | (fresh,let v = string2val(read_fresh_id()) in function _ -> v) |
61 | | ((r,n) as fresh,Ast.StringSeed seed) -> | |
62 | (fresh,let v = string2val(get_seeded seed) in function _ -> v) | |
63 | | ((r,n) as fresh,Ast.ListSeed seed) -> | |
64 | (fresh, | |
65 | function env -> | |
66 | let strings = | |
67 | List.map | |
68 | (function | |
69 | Ast.SeedString s -> s | |
70 | | Ast.SeedId id -> | |
71 | try | |
72 | (match List.assoc id env with | |
73 | Lib_engine.NormalMetaVal(Ast_c.MetaIdVal(str)) -> | |
74 | str | |
75 | | _ -> failwith "bad id value") | |
76 | with | |
77 | Not_found -> failwith "fresh: no binding for meta") | |
78 | seed in | |
79 | string2val(String.concat "" strings))) | |
34e49164 C |
80 | all_fresh in |
81 | let (_,res) = | |
82 | List.split | |
83 | (List.fold_left | |
84 | (function freshs_node_env_preds -> | |
978fd7e5 | 85 | function (fresh,fn) -> |
34e49164 C |
86 | List.map |
87 | (function (freshs,((node,env,pred) as cur)) -> | |
b1b2de81 C |
88 | try |
89 | let _ = List.assoc fresh freshs in | |
978fd7e5 | 90 | (freshs,(node,(fresh,fn env)::env,pred)) |
b1b2de81 | 91 | with Not_found -> (freshs,cur)) |
34e49164 C |
92 | freshs_node_env_preds) |
93 | (List.combine local_freshs new_triples) | |
94 | fresh_env) in | |
95 | (List.rev res, fresh_env) | |
96 | ||
97 | (* ----------------------------------------------------------------------- *) | |
98 | (* Create the environment to be used afterwards *) | |
978fd7e5 C |
99 | (* anything that a used after fresh variable refers to has to have a unique |
100 | value, by virtue of the placement of the quantifier. thus we augment | |
101 | inherited env with the first element of l, if any *) | |
102 | ||
103 | let collect_used_after used_after envs l inherited_env = | |
104 | List.map2 | |
105 | (function env -> function l -> | |
106 | let inherited_env = | |
107 | match l with | |
108 | [] -> inherited_env | |
109 | | (_,fse,_)::_ -> | |
110 | (* l represents the result from a single tree. fse is a complete | |
111 | environment in that tree. for a fresh seed, the environments | |
112 | for all leaves contain the same information *) | |
113 | fse@inherited_env in | |
114 | List.map | |
115 | (function (v,vl) -> (v,vl inherited_env)) | |
116 | (List.filter (function (v,vl) -> List.mem v used_after) env)) | |
117 | envs l | |
34e49164 | 118 | |
708f4980 C |
119 | (* ----------------------------------------------------------------------- *) |
120 | (* distinguish between distinct witness trees, each gets an index n *) | |
121 | ||
122 | let numberify trees = | |
123 | let trees = | |
124 | Common.fold_left_with_index | |
125 | (function acc -> function xs -> function n -> | |
126 | (List.map (function x -> (n,x)) xs) @ acc) | |
127 | [] trees in | |
128 | List.fold_left | |
129 | (function res -> | |
130 | function (n,x) -> | |
131 | let (same,diff) = List.partition (function (ns,xs) -> x = xs) res in | |
132 | match same with | |
133 | [(ns,xs)] -> (n::ns,xs)::diff | |
134 | | _ -> ([n],x)::res) | |
135 | [] trees | |
136 | ||
34e49164 C |
137 | (* ----------------------------------------------------------------------- *) |
138 | (* entry point *) | |
139 | ||
140 | let process used_after inherited_env l = | |
34e49164 C |
141 | let (trees, fresh_envs) = |
142 | List.split (List.map (process_tree inherited_env) l) in | |
708f4980 | 143 | let trees = numberify trees in |
978fd7e5 | 144 | (trees, collect_used_after used_after fresh_envs l inherited_env) |