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f537ebc4 | 1 | (* |
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2 | * Copyright 2012, INRIA |
3 | * Julia Lawall, Gilles Muller | |
4 | * Copyright 2010-2011, INRIA, University of Copenhagen | |
f537ebc4 C |
5 | * Julia Lawall, Rene Rydhof Hansen, Gilles Muller, Nicolas Palix |
6 | * Copyright 2005-2009, Ecole des Mines de Nantes, University of Copenhagen | |
7 | * Yoann Padioleau, Julia Lawall, Rene Rydhof Hansen, Henrik Stuart, Gilles Muller, Nicolas Palix | |
8 | * This file is part of Coccinelle. | |
9 | * | |
10 | * Coccinelle is free software: you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation, according to version 2 of the License. | |
13 | * | |
14 | * Coccinelle is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with Coccinelle. If not, see <http://www.gnu.org/licenses/>. | |
21 | * | |
22 | * The authors reserve the right to distribute this or future versions of | |
23 | * Coccinelle under other licenses. | |
24 | *) | |
25 | ||
26 | ||
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27 | (* get a list of all of the constants in the - slice of a SmPL file, to be |
28 | used to select which files to process *) | |
29 | ||
30 | (* This could be made more efficient, by finding only the important things. | |
31 | eg, if we have a function and its arguments, we could just pick the function. | |
32 | And we could try to pick only the things annotated with -, and only pick | |
33 | something else if there is no -. In general, we only want the most important | |
34 | constant, not all the constants. *) | |
35 | ||
36 | module Ast = Ast_cocci | |
37 | module V = Visitor_ast | |
38 | module TC = Type_cocci | |
39 | ||
40 | let keep_some_bind x y = match x with [] -> y | _ -> x | |
41 | let or_bind x y = match x with [] -> [] | _ -> x | |
42 | let keep_all_bind = Common.union_set | |
43 | ||
44 | let get_minus_constants bind orbind = | |
45 | let donothing r k e = k e in | |
46 | let option_default = [] in | |
47 | let mcode _ _ = option_default in | |
48 | ||
49 | (* if one branch gives no information, then we have to take anything *) | |
50 | let disj_union_all l = | |
51 | if List.exists (function [] -> true | _ -> false) l | |
52 | then orbind [] (Common.union_all l) | |
53 | else Common.union_all l in | |
54 | ||
55 | (* need special cases for everything with a disj, because the bind above | |
56 | would throw away all but the first disj *) | |
57 | ||
58 | let ident r k e = | |
59 | match Ast.unwrap e with | |
60 | Ast.Id(name) -> | |
61 | (match Ast.unwrap_mcode name with | |
62 | "NULL" -> [] (* special case, because this is too generic *) | |
63 | | nm -> [nm]) | |
64 | | _ -> k e in | |
65 | ||
66 | let expression r k e = | |
67 | match Ast.unwrap e with | |
68 | Ast.RecordAccess(exp,_,fld) | Ast.RecordPtAccess(exp,_,fld) -> | |
69 | bind | |
70 | (Common.union_all | |
71 | (List.map (function id -> ["."^id;"->"^id]) | |
72 | (r.V.combiner_ident fld))) | |
73 | (r.V.combiner_expression exp) | |
74 | | Ast.SizeOfExpr(sizeof,_) | Ast.SizeOfType(sizeof,_,_,_) -> | |
75 | bind (k e) [Ast.unwrap_mcode sizeof] | |
76 | | Ast.DisjExpr(exps) -> | |
77 | disj_union_all (List.map r.V.combiner_expression exps) | |
78 | | Ast.Edots(_,_) | Ast.Ecircles(_,_) | Ast.Estars(_,_) -> [] | |
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79 | | Ast.NestExpr(starter,expr_dots,ender,whencode,false) -> [] |
80 | | Ast.NestExpr(starter,expr_dots,ender,whencode,true) -> | |
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81 | r.V.combiner_expression_dots expr_dots |
82 | | _ -> k e in | |
83 | ||
84 | let typeC r k e = | |
85 | match Ast.unwrap e with | |
86 | Ast.TypeName(ty) -> | |
87 | if !Flag.sgrep_mode2 | |
88 | then | |
89 | match ty with | |
708f4980 | 90 | (_,_,Ast.MINUS(_,_,_,_),_) -> [Ast.unwrap_mcode ty] |
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91 | | _ -> [] |
92 | else [Ast.unwrap_mcode ty] | |
93 | | _ -> k e in | |
94 | ||
95 | let fullType r k e = | |
96 | match Ast.unwrap e with | |
97 | Ast.DisjType(types) -> | |
98 | disj_union_all (List.map r.V.combiner_fullType types) | |
99 | | _ -> k e in | |
100 | ||
101 | let declaration r k e = | |
102 | match Ast.unwrap e with | |
103 | Ast.DisjDecl(decls) -> | |
104 | disj_union_all (List.map r.V.combiner_declaration decls) | |
105 | | Ast.Ddots(dots,whencode) -> [] | |
106 | | _ -> k e in | |
107 | ||
108 | let rule_elem r k e = | |
109 | match Ast.unwrap e with | |
110 | Ast.DisjRuleElem(res) -> | |
111 | disj_union_all (List.map r.V.combiner_rule_elem res) | |
112 | | _ -> k e in | |
113 | ||
114 | let statement r k e = | |
115 | match Ast.unwrap e with | |
116 | Ast.Disj(stmt_dots) -> | |
117 | disj_union_all (List.map r.V.combiner_statement_dots stmt_dots) | |
118 | | Ast.Dots(d,whn,_,_) | Ast.Circles(d,whn,_,_) | Ast.Stars(d,whn,_,_) -> [] | |
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119 | | Ast.Nest(starter,stmt_dots,ender,whn,false,_,_) -> [] |
120 | | Ast.Nest(starter,stmt_dots,ender,whn,true,_,_) -> | |
121 | r.V.combiner_statement_dots stmt_dots | |
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122 | | _ -> k e in |
123 | ||
124 | V.combiner bind option_default | |
125 | mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode | |
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126 | donothing donothing donothing donothing |
127 | ident expression fullType typeC donothing donothing declaration | |
128 | rule_elem statement donothing donothing donothing | |
129 | ||
130 | (* ------------------------------------------------------------------------ *) | |
131 | ||
132 | let get_all_minus_constants = | |
133 | let donothing r k e = k e in | |
134 | let bind = Common.union_set in | |
135 | let option_default = [] in | |
136 | let mcode r (x,_,mcodekind,_) = | |
137 | match mcodekind with | |
708f4980 | 138 | Ast.MINUS(_,_,_,_) -> [x] |
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139 | | _ -> [] in |
140 | let other r (x,_,mcodekind,_) = [] in | |
141 | ||
142 | V.combiner bind option_default | |
143 | other mcode other other other other other other other other other other | |
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144 | |
145 | donothing donothing donothing donothing | |
146 | donothing donothing donothing donothing donothing donothing donothing | |
147 | donothing donothing donothing donothing donothing | |
148 | (* ------------------------------------------------------------------------ *) | |
149 | ||
150 | let get_plus_constants = | |
151 | let donothing r k e = k e in | |
152 | let bind = Common.union_set in | |
153 | let option_default = [] in | |
154 | let mcode r (_,_,mcodekind,_) = | |
155 | let recurse l = | |
156 | List.fold_left | |
157 | (List.fold_left | |
158 | (function prev -> | |
159 | function cur -> | |
160 | let fn = get_minus_constants keep_all_bind keep_all_bind in | |
161 | bind (fn.V.combiner_anything cur) prev)) | |
162 | [] l in | |
163 | match mcodekind with | |
708f4980 | 164 | Ast.MINUS(_,_,_,anythings) -> recurse anythings |
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165 | | Ast.CONTEXT(_,Ast.BEFORE(a,_)) -> recurse a |
166 | | Ast.CONTEXT(_,Ast.AFTER(a,_)) -> recurse a | |
167 | | Ast.CONTEXT(_,Ast.BEFOREAFTER(a1,a2,_)) -> | |
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168 | Common.union_set (recurse a1) (recurse a2) |
169 | | _ -> [] in | |
170 | ||
171 | V.combiner bind option_default | |
172 | mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode | |
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173 | donothing donothing donothing donothing |
174 | donothing donothing donothing donothing donothing donothing donothing | |
175 | donothing donothing donothing donothing donothing | |
176 | ||
177 | (* ------------------------------------------------------------------------ *) | |
178 | (* see if there are any inherited variables that must be bound for this rule | |
179 | to match *) | |
180 | ||
181 | let check_inherited nm = | |
182 | let donothing r k e = k e in | |
183 | let option_default = false in | |
184 | let bind x y = x or y in | |
185 | let inherited (nm1,_) = not(nm = nm1) in | |
186 | let minherited mc = inherited (Ast.unwrap_mcode mc) in | |
187 | let mcode _ x = | |
188 | match Ast.get_pos_var x with | |
189 | Ast.MetaPos(name,constraints,_,keep,inh) -> minherited name | |
190 | | _ -> option_default in | |
191 | ||
192 | (* a case for everything for there is a metavariable, also disjunctions | |
193 | or optional things *) | |
194 | ||
195 | let strictident recursor k i = | |
196 | match Ast.unwrap i with | |
197 | Ast.MetaId(name,_,_,_) | Ast.MetaFunc(name,_,_,_) | |
198 | | Ast.MetaLocalFunc(name,_,_,_) -> bind (k i) (minherited name) | |
199 | | _ -> k i in | |
200 | ||
201 | let rec type_collect res = function | |
202 | TC.ConstVol(_,ty) | TC.Pointer(ty) | TC.FunctionPointer(ty) | |
203 | | TC.Array(ty) -> type_collect res ty | |
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204 | | TC.MetaType(tyname,_,_) -> |
205 | inherited tyname | |
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206 | | ty -> res in |
207 | ||
208 | let strictexpr recursor k e = | |
209 | match Ast.unwrap e with | |
210 | Ast.MetaExpr(name,_,_,Some type_list,_,_) -> | |
211 | let types = List.fold_left type_collect option_default type_list in | |
212 | bind (minherited name) types | |
213 | | Ast.MetaErr(name,_,_,_) | Ast.MetaExpr(name,_,_,_,_,_) -> | |
214 | bind (k e) (minherited name) | |
215 | | Ast.MetaExprList(name,None,_,_) -> bind (k e) (minherited name) | |
216 | | Ast.MetaExprList(name,Some (lenname,_,_),_,_) -> | |
217 | bind (k e) (bind (minherited name) (minherited lenname)) | |
218 | | Ast.DisjExpr(exps) -> | |
219 | (* could see if there are any variables that appear in all branches, | |
220 | but perhaps not worth it *) | |
221 | option_default | |
222 | | _ -> k e in | |
223 | ||
224 | let strictdecls recursor k d = | |
225 | match Ast.unwrap d with | |
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226 | Ast.MetaDecl(name,_,_) | Ast.MetaField(name,_,_) -> |
227 | bind (k p) (minherited name) | |
228 | | Ast.DisjDecl(decls) -> option_default | |
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229 | | _ -> k d in |
230 | ||
231 | let strictfullType recursor k ty = | |
232 | match Ast.unwrap ty with | |
233 | Ast.DisjType(types) -> option_default | |
234 | | _ -> k ty in | |
235 | ||
236 | let stricttypeC recursor k ty = | |
237 | match Ast.unwrap ty with | |
238 | Ast.MetaType(name,_,_) -> bind (k ty) (minherited name) | |
239 | | _ -> k ty in | |
240 | ||
241 | let strictparam recursor k p = | |
242 | match Ast.unwrap p with | |
243 | Ast.MetaParam(name,_,_) -> bind (k p) (minherited name) | |
244 | | Ast.MetaParamList(name,None,_,_) -> bind (k p) (minherited name) | |
245 | | Ast.MetaParamList(name,Some(lenname,_,_),_,_) -> | |
246 | bind (k p) (bind (minherited name) (minherited lenname)) | |
247 | | _ -> k p in | |
248 | ||
249 | let strictrule_elem recursor k re = | |
250 | (*within a rule_elem, pattern3 manages the coherence of the bindings*) | |
251 | match Ast.unwrap re with | |
252 | Ast.MetaRuleElem(name,_,_) | Ast.MetaStmt(name,_,_,_) | |
253 | | Ast.MetaStmtList(name,_,_) -> bind (k re) (minherited name) | |
254 | | _ -> k re in | |
255 | ||
256 | let strictstatement recursor k s = | |
257 | match Ast.unwrap s with | |
258 | Ast.Disj(stms) -> option_default | |
259 | | _ -> k s in | |
260 | ||
261 | V.combiner bind option_default | |
262 | mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode | |
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263 | donothing donothing donothing donothing |
264 | strictident strictexpr strictfullType stricttypeC donothing strictparam | |
265 | strictdecls strictrule_elem strictstatement donothing donothing donothing | |
266 | ||
267 | (* ------------------------------------------------------------------------ *) | |
268 | ||
269 | let rec dependent = function | |
270 | Ast.Dep s -> true | |
271 | | Ast.AntiDep s -> false | |
272 | | Ast.EverDep s -> true | |
273 | | Ast.NeverDep s -> false | |
274 | | Ast.AndDep (d1,d2) -> dependent d1 or dependent d2 | |
275 | | Ast.OrDep (d1,d2) -> dependent d1 && dependent d2 | |
276 | | Ast.NoDep -> false | |
7f004419 | 277 | | Ast.FailDep -> true |
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278 | |
279 | (* ------------------------------------------------------------------------ *) | |
280 | ||
281 | let rule_fn tls in_plus = | |
282 | List.fold_left | |
283 | (function (rest_info,in_plus) -> | |
284 | function cur -> | |
285 | let mfn = get_minus_constants keep_some_bind or_bind in | |
286 | let minuses = mfn.V.combiner_top_level cur in | |
287 | let all_minuses = | |
288 | if !Flag.sgrep_mode2 | |
289 | then [] (* nothing removed for sgrep *) | |
290 | else get_all_minus_constants.V.combiner_top_level cur in | |
291 | let plusses = get_plus_constants.V.combiner_top_level cur in | |
292 | (* the following is for eg -foo(2) +foo(x) then in another rule | |
293 | -foo(10); don't want to consider that foo is guaranteed to be | |
294 | created by the rule. not sure this works completely: what if foo is | |
295 | in both - and +, but in an or, so the cases aren't related? | |
296 | not sure this whole thing is a good idea. how do we know that | |
297 | something that is only in plus is really freshly created? *) | |
298 | let plusses = Common.minus_set plusses all_minuses in | |
299 | let new_minuses = Common.minus_set minuses in_plus in | |
300 | let new_plusses = Common.union_set plusses in_plus in | |
301 | (Common.union_set new_minuses rest_info, new_plusses)) | |
302 | ([],in_plus) tls | |
303 | ||
304 | exception No_info | |
305 | ||
306 | let get_constants rules = | |
307 | try | |
308 | let (info,_) = | |
309 | List.fold_left | |
310 | (function (rest_info,in_plus) -> | |
311 | function r -> | |
312 | match r with | |
b1b2de81 | 313 | Ast.ScriptRule (_,_,_,_) |
c3e37e97 | 314 | | Ast.InitialScriptRule (_,_,_) | Ast.FinalScriptRule (_,_,_) -> |
b1b2de81 | 315 | (rest_info, in_plus) |
faf9a90c | 316 | | Ast.CocciRule (nm, (dep,_,_), cur, _, _) -> |
34e49164 C |
317 | let (cur_info,cur_plus) = rule_fn cur in_plus in |
318 | let cur_info = | |
319 | (* no dependencies if dependent on another rule; then we | |
320 | need to find the constants of that rule *) | |
321 | if dependent dep or | |
322 | List.for_all (check_inherited nm).V.combiner_top_level cur | |
323 | then [] | |
324 | else | |
325 | if cur_info = [] then raise No_info else cur_info in | |
326 | (Common.union_set [cur_info] rest_info,cur_plus)) | |
327 | ([],[]) rules in | |
328 | List.rev info | |
329 | with No_info -> List.map (function _ -> []) rules |