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9f8e26f4 | 1 | (* |
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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 | |
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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 | (* get a list of all of the constants in the - slice of a SmPL file, to be |
26 | used to select which files to process *) | |
27 | ||
28 | (* This could be made more efficient, by finding only the important things. | |
29 | eg, if we have a function and its arguments, we could just pick the function. | |
30 | And we could try to pick only the things annotated with -, and only pick | |
31 | something else if there is no -. In general, we only want the most important | |
32 | constant, not all the constants. *) | |
33 | ||
34 | module Ast = Ast_cocci | |
35 | module V = Visitor_ast | |
36 | module TC = Type_cocci | |
37 | ||
38 | let keep_some_bind x y = match x with [] -> y | _ -> x | |
39 | let or_bind x y = match x with [] -> [] | _ -> x | |
40 | let keep_all_bind = Common.union_set | |
41 | ||
42 | let get_minus_constants bind orbind = | |
43 | let donothing r k e = k e in | |
44 | let option_default = [] in | |
45 | let mcode _ _ = option_default in | |
46 | ||
47 | (* if one branch gives no information, then we have to take anything *) | |
48 | let disj_union_all l = | |
49 | if List.exists (function [] -> true | _ -> false) l | |
50 | then orbind [] (Common.union_all l) | |
51 | else Common.union_all l in | |
52 | ||
53 | (* need special cases for everything with a disj, because the bind above | |
54 | would throw away all but the first disj *) | |
55 | ||
56 | let ident r k e = | |
57 | match Ast.unwrap e with | |
58 | Ast.Id(name) -> | |
59 | (match Ast.unwrap_mcode name with | |
60 | "NULL" -> [] (* special case, because this is too generic *) | |
61 | | nm -> [nm]) | |
62 | | _ -> k e in | |
63 | ||
64 | let expression r k e = | |
65 | match Ast.unwrap e with | |
66 | Ast.RecordAccess(exp,_,fld) | Ast.RecordPtAccess(exp,_,fld) -> | |
67 | bind | |
68 | (Common.union_all | |
69 | (List.map (function id -> ["."^id;"->"^id]) | |
70 | (r.V.combiner_ident fld))) | |
71 | (r.V.combiner_expression exp) | |
72 | | Ast.SizeOfExpr(sizeof,_) | Ast.SizeOfType(sizeof,_,_,_) -> | |
73 | bind (k e) [Ast.unwrap_mcode sizeof] | |
74 | | Ast.DisjExpr(exps) -> | |
75 | disj_union_all (List.map r.V.combiner_expression exps) | |
76 | | Ast.Edots(_,_) | Ast.Ecircles(_,_) | Ast.Estars(_,_) -> [] | |
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77 | | Ast.NestExpr(starter,expr_dots,ender,whencode,false) -> [] |
78 | | Ast.NestExpr(starter,expr_dots,ender,whencode,true) -> | |
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79 | r.V.combiner_expression_dots expr_dots |
80 | | _ -> k e in | |
81 | ||
82 | let typeC r k e = | |
83 | match Ast.unwrap e with | |
84 | Ast.TypeName(ty) -> | |
85 | if !Flag.sgrep_mode2 | |
86 | then | |
87 | match ty with | |
708f4980 | 88 | (_,_,Ast.MINUS(_,_,_,_),_) -> [Ast.unwrap_mcode ty] |
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89 | | _ -> [] |
90 | else [Ast.unwrap_mcode ty] | |
91 | | _ -> k e in | |
92 | ||
93 | let fullType r k e = | |
94 | match Ast.unwrap e with | |
95 | Ast.DisjType(types) -> | |
96 | disj_union_all (List.map r.V.combiner_fullType types) | |
97 | | _ -> k e in | |
98 | ||
99 | let declaration r k e = | |
100 | match Ast.unwrap e with | |
101 | Ast.DisjDecl(decls) -> | |
102 | disj_union_all (List.map r.V.combiner_declaration decls) | |
103 | | Ast.Ddots(dots,whencode) -> [] | |
104 | | _ -> k e in | |
105 | ||
106 | let rule_elem r k e = | |
107 | match Ast.unwrap e with | |
108 | Ast.DisjRuleElem(res) -> | |
109 | disj_union_all (List.map r.V.combiner_rule_elem res) | |
110 | | _ -> k e in | |
111 | ||
112 | let statement r k e = | |
113 | match Ast.unwrap e with | |
114 | Ast.Disj(stmt_dots) -> | |
115 | disj_union_all (List.map r.V.combiner_statement_dots stmt_dots) | |
116 | | Ast.Dots(d,whn,_,_) | Ast.Circles(d,whn,_,_) | Ast.Stars(d,whn,_,_) -> [] | |
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117 | | Ast.Nest(starter,stmt_dots,ender,whn,false,_,_) -> [] |
118 | | Ast.Nest(starter,stmt_dots,ender,whn,true,_,_) -> | |
119 | r.V.combiner_statement_dots stmt_dots | |
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120 | | _ -> k e in |
121 | ||
122 | V.combiner bind option_default | |
123 | mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode | |
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124 | donothing donothing donothing donothing |
125 | ident expression fullType typeC donothing donothing declaration | |
126 | rule_elem statement donothing donothing donothing | |
127 | ||
128 | (* ------------------------------------------------------------------------ *) | |
129 | ||
130 | let get_all_minus_constants = | |
131 | let donothing r k e = k e in | |
132 | let bind = Common.union_set in | |
133 | let option_default = [] in | |
134 | let mcode r (x,_,mcodekind,_) = | |
135 | match mcodekind with | |
708f4980 | 136 | Ast.MINUS(_,_,_,_) -> [x] |
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137 | | _ -> [] in |
138 | let other r (x,_,mcodekind,_) = [] in | |
139 | ||
140 | V.combiner bind option_default | |
141 | other mcode other other other other other other other other other other | |
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142 | |
143 | donothing donothing donothing donothing | |
144 | donothing donothing donothing donothing donothing donothing donothing | |
145 | donothing donothing donothing donothing donothing | |
146 | (* ------------------------------------------------------------------------ *) | |
147 | ||
148 | let get_plus_constants = | |
149 | let donothing r k e = k e in | |
150 | let bind = Common.union_set in | |
151 | let option_default = [] in | |
152 | let mcode r (_,_,mcodekind,_) = | |
153 | let recurse l = | |
154 | List.fold_left | |
155 | (List.fold_left | |
156 | (function prev -> | |
157 | function cur -> | |
158 | let fn = get_minus_constants keep_all_bind keep_all_bind in | |
159 | bind (fn.V.combiner_anything cur) prev)) | |
160 | [] l in | |
161 | match mcodekind with | |
708f4980 | 162 | Ast.MINUS(_,_,_,anythings) -> recurse anythings |
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163 | | Ast.CONTEXT(_,Ast.BEFORE(a,_)) -> recurse a |
164 | | Ast.CONTEXT(_,Ast.AFTER(a,_)) -> recurse a | |
165 | | Ast.CONTEXT(_,Ast.BEFOREAFTER(a1,a2,_)) -> | |
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166 | Common.union_set (recurse a1) (recurse a2) |
167 | | _ -> [] in | |
168 | ||
169 | V.combiner bind option_default | |
170 | mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode | |
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171 | donothing donothing donothing donothing |
172 | donothing donothing donothing donothing donothing donothing donothing | |
173 | donothing donothing donothing donothing donothing | |
174 | ||
175 | (* ------------------------------------------------------------------------ *) | |
176 | (* see if there are any inherited variables that must be bound for this rule | |
177 | to match *) | |
178 | ||
179 | let check_inherited nm = | |
180 | let donothing r k e = k e in | |
181 | let option_default = false in | |
182 | let bind x y = x or y in | |
183 | let inherited (nm1,_) = not(nm = nm1) in | |
184 | let minherited mc = inherited (Ast.unwrap_mcode mc) in | |
185 | let mcode _ x = | |
186 | match Ast.get_pos_var x with | |
187 | Ast.MetaPos(name,constraints,_,keep,inh) -> minherited name | |
188 | | _ -> option_default in | |
189 | ||
190 | (* a case for everything for there is a metavariable, also disjunctions | |
191 | or optional things *) | |
192 | ||
193 | let strictident recursor k i = | |
194 | match Ast.unwrap i with | |
195 | Ast.MetaId(name,_,_,_) | Ast.MetaFunc(name,_,_,_) | |
196 | | Ast.MetaLocalFunc(name,_,_,_) -> bind (k i) (minherited name) | |
197 | | _ -> k i in | |
198 | ||
199 | let rec type_collect res = function | |
200 | TC.ConstVol(_,ty) | TC.Pointer(ty) | TC.FunctionPointer(ty) | |
201 | | TC.Array(ty) -> type_collect res ty | |
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202 | | TC.MetaType(tyname,_,_) -> |
203 | inherited tyname | |
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204 | | ty -> res in |
205 | ||
206 | let strictexpr recursor k e = | |
207 | match Ast.unwrap e with | |
208 | Ast.MetaExpr(name,_,_,Some type_list,_,_) -> | |
209 | let types = List.fold_left type_collect option_default type_list in | |
210 | bind (minherited name) types | |
211 | | Ast.MetaErr(name,_,_,_) | Ast.MetaExpr(name,_,_,_,_,_) -> | |
212 | bind (k e) (minherited name) | |
213 | | Ast.MetaExprList(name,None,_,_) -> bind (k e) (minherited name) | |
214 | | Ast.MetaExprList(name,Some (lenname,_,_),_,_) -> | |
215 | bind (k e) (bind (minherited name) (minherited lenname)) | |
216 | | Ast.DisjExpr(exps) -> | |
217 | (* could see if there are any variables that appear in all branches, | |
218 | but perhaps not worth it *) | |
219 | option_default | |
220 | | _ -> k e in | |
221 | ||
222 | let strictdecls recursor k d = | |
223 | match Ast.unwrap d with | |
224 | Ast.DisjDecl(decls) -> option_default | |
225 | | _ -> k d in | |
226 | ||
227 | let strictfullType recursor k ty = | |
228 | match Ast.unwrap ty with | |
229 | Ast.DisjType(types) -> option_default | |
230 | | _ -> k ty in | |
231 | ||
232 | let stricttypeC recursor k ty = | |
233 | match Ast.unwrap ty with | |
234 | Ast.MetaType(name,_,_) -> bind (k ty) (minherited name) | |
235 | | _ -> k ty in | |
236 | ||
237 | let strictparam recursor k p = | |
238 | match Ast.unwrap p with | |
239 | Ast.MetaParam(name,_,_) -> bind (k p) (minherited name) | |
240 | | Ast.MetaParamList(name,None,_,_) -> bind (k p) (minherited name) | |
241 | | Ast.MetaParamList(name,Some(lenname,_,_),_,_) -> | |
242 | bind (k p) (bind (minherited name) (minherited lenname)) | |
243 | | _ -> k p in | |
244 | ||
245 | let strictrule_elem recursor k re = | |
246 | (*within a rule_elem, pattern3 manages the coherence of the bindings*) | |
247 | match Ast.unwrap re with | |
248 | Ast.MetaRuleElem(name,_,_) | Ast.MetaStmt(name,_,_,_) | |
249 | | Ast.MetaStmtList(name,_,_) -> bind (k re) (minherited name) | |
250 | | _ -> k re in | |
251 | ||
252 | let strictstatement recursor k s = | |
253 | match Ast.unwrap s with | |
254 | Ast.Disj(stms) -> option_default | |
255 | | _ -> k s in | |
256 | ||
257 | V.combiner bind option_default | |
258 | mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode | |
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259 | donothing donothing donothing donothing |
260 | strictident strictexpr strictfullType stricttypeC donothing strictparam | |
261 | strictdecls strictrule_elem strictstatement donothing donothing donothing | |
262 | ||
263 | (* ------------------------------------------------------------------------ *) | |
264 | ||
265 | let rec dependent = function | |
266 | Ast.Dep s -> true | |
267 | | Ast.AntiDep s -> false | |
268 | | Ast.EverDep s -> true | |
269 | | Ast.NeverDep s -> false | |
270 | | Ast.AndDep (d1,d2) -> dependent d1 or dependent d2 | |
271 | | Ast.OrDep (d1,d2) -> dependent d1 && dependent d2 | |
272 | | Ast.NoDep -> false | |
7f004419 | 273 | | Ast.FailDep -> true |
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274 | |
275 | (* ------------------------------------------------------------------------ *) | |
276 | ||
277 | let rule_fn tls in_plus = | |
278 | List.fold_left | |
279 | (function (rest_info,in_plus) -> | |
280 | function cur -> | |
281 | let mfn = get_minus_constants keep_some_bind or_bind in | |
282 | let minuses = mfn.V.combiner_top_level cur in | |
283 | let all_minuses = | |
284 | if !Flag.sgrep_mode2 | |
285 | then [] (* nothing removed for sgrep *) | |
286 | else get_all_minus_constants.V.combiner_top_level cur in | |
287 | let plusses = get_plus_constants.V.combiner_top_level cur in | |
288 | (* the following is for eg -foo(2) +foo(x) then in another rule | |
289 | -foo(10); don't want to consider that foo is guaranteed to be | |
290 | created by the rule. not sure this works completely: what if foo is | |
291 | in both - and +, but in an or, so the cases aren't related? | |
292 | not sure this whole thing is a good idea. how do we know that | |
293 | something that is only in plus is really freshly created? *) | |
294 | let plusses = Common.minus_set plusses all_minuses in | |
295 | let new_minuses = Common.minus_set minuses in_plus in | |
296 | let new_plusses = Common.union_set plusses in_plus in | |
297 | (Common.union_set new_minuses rest_info, new_plusses)) | |
298 | ([],in_plus) tls | |
299 | ||
300 | exception No_info | |
301 | ||
302 | let get_constants rules = | |
303 | try | |
304 | let (info,_) = | |
305 | List.fold_left | |
306 | (function (rest_info,in_plus) -> | |
307 | function r -> | |
308 | match r with | |
b1b2de81 | 309 | Ast.ScriptRule (_,_,_,_) |
c3e37e97 | 310 | | Ast.InitialScriptRule (_,_,_) | Ast.FinalScriptRule (_,_,_) -> |
b1b2de81 | 311 | (rest_info, in_plus) |
faf9a90c | 312 | | Ast.CocciRule (nm, (dep,_,_), cur, _, _) -> |
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313 | let (cur_info,cur_plus) = rule_fn cur in_plus in |
314 | let cur_info = | |
315 | (* no dependencies if dependent on another rule; then we | |
316 | need to find the constants of that rule *) | |
317 | if dependent dep or | |
318 | List.for_all (check_inherited nm).V.combiner_top_level cur | |
319 | then [] | |
320 | else | |
321 | if cur_info = [] then raise No_info else cur_info in | |
322 | (Common.union_set [cur_info] rest_info,cur_plus)) | |
323 | ([],[]) rules in | |
324 | List.rev info | |
325 | with No_info -> List.map (function _ -> []) rules |