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c491d8ee C |
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 | ||
34e49164 C |
25 | module Ast = Ast_cocci |
26 | module V = Visitor_ast | |
27 | module TC = Type_cocci | |
28 | ||
29 | (* Issues: | |
30 | ||
31 | 1. If a rule X depends on a rule Y (in a positive way), then we can ignore | |
32 | the constants in X. | |
33 | ||
34 | 2. If a rule X contains a metavariable that is not under a disjunction and | |
35 | that is inherited from rule Y, then we can ignore the constants in X. | |
36 | ||
37 | 3. If a rule contains a constant x in + code then subsequent rules that | |
38 | have it in - or context should not include it in their list of required | |
39 | constants. | |
40 | *) | |
41 | ||
90aeb998 C |
42 | (* This doesn't do the . -> trick of get_constants for record fields, as |
43 | that does not fit well with the recursive structure. It was not clear | |
44 | that that was completely safe either, although eg putting a newline | |
45 | after the . or -> is probably unusual. *) | |
46 | ||
34e49164 C |
47 | (* ----------------------------------------------------------------------- *) |
48 | (* This phase collects everything. One can then filter out what it not | |
49 | wanted *) | |
50 | ||
51 | (* True means nothing was found | |
52 | False should never drift to the top, it is the neutral element of or | |
53 | and an or is never empty *) | |
54 | type combine = | |
55 | And of combine list | Or of combine list | Elem of string | False | True | |
56 | ||
413ffc02 C |
57 | (* glimpse often fails on large queries. We can safely remove arguments of |
58 | && as long as we don't remove all of them (note that there is no negation). | |
59 | This tries just removing one of them and then orders the results by | |
60 | increasing number of ors (ors are long, increasing the chance of failure, | |
61 | and are less restrictive, possibly increasing the chance of irrelevant | |
62 | code. *) | |
63 | let reduce_glimpse x = | |
64 | let rec loop x k q = | |
65 | match x with | |
66 | Elem _ -> q() | |
67 | | And [x] -> loop x (function changed_l -> k (And [changed_l])) q | |
68 | | And l -> | |
69 | kloop l | |
70 | (function changed_l -> k (And changed_l)) | |
71 | (function _ -> | |
72 | let rec rloop l k = | |
73 | match l with | |
74 | [] -> q() | |
75 | | x::xs -> | |
76 | (k xs) :: | |
77 | rloop xs (function changed_xs -> k (x :: changed_xs)) in | |
78 | rloop l (function changed_l -> k (And changed_l))) | |
79 | | Or l -> kloop l (function changed_l -> k (Or changed_l)) q | |
80 | | _ -> failwith "not possible" | |
81 | and kloop l k q = | |
82 | match l with | |
83 | [] -> q() | |
84 | | x::xs -> | |
85 | loop x | |
86 | (function changed_x -> k (changed_x::xs)) | |
87 | (function _ -> | |
88 | kloop xs | |
89 | (function changed_xs -> k (x :: changed_xs)) | |
90 | q) in | |
91 | let rec count_ors = function | |
92 | Elem _ -> 0 | |
93 | | And l -> List.fold_left (+) 0 (List.map count_ors l) | |
94 | | Or l -> | |
95 | ((List.length l) - 1) + | |
96 | (List.fold_left (+) 0 (List.map count_ors l)) | |
97 | | _ -> failwith "not possible" in | |
98 | let res = loop x (function x -> x) (function _ -> []) in | |
99 | let res = List.map (function x -> (count_ors x,x)) res in | |
100 | let res = List.sort compare res in | |
101 | List.map (function (_,x) -> x) res | |
102 | ||
951c7801 | 103 | let interpret_glimpse strict x = |
34e49164 C |
104 | let rec loop = function |
105 | Elem x -> x | |
106 | | And [x] -> loop x | |
107 | | Or [x] -> loop x | |
108 | | And l -> Printf.sprintf "{%s}" (String.concat ";" (List.map loop l)) | |
109 | | Or l -> Printf.sprintf "{%s}" (String.concat "," (List.map loop l)) | |
90aeb998 C |
110 | | True -> |
111 | if strict | |
112 | then failwith "True should not be in the final result" | |
113 | else "True" | |
34e49164 C |
114 | | False -> |
115 | if strict | |
116 | then failwith "False should not be in the final result. Perhaps your rule doesn't contain any +/-/* code" | |
117 | else "False" in | |
118 | match x with | |
119 | True -> None | |
120 | | False when strict -> | |
121 | failwith "False should not be in the final result. Perhaps your rule doesn't contain any +/-/* code" | |
413ffc02 C |
122 | | _ -> |
123 | Some (if strict then List.map loop (x::reduce_glimpse x) else [loop x]) | |
951c7801 | 124 | |
90aeb998 C |
125 | (* grep only does or *) |
126 | let interpret_grep strict x = | |
127 | let rec loop = function | |
128 | Elem x -> [x] | |
129 | | And l -> List.concat (List.map loop l) | |
130 | | Or l -> List.concat (List.map loop l) | |
131 | | True -> | |
132 | if strict | |
133 | then failwith "True should not be in the final result" | |
134 | else ["True"] | |
135 | | False -> | |
136 | if strict | |
137 | then failwith "False should not be in the final result. Perhaps your rule doesn't contain any +/-/* code" | |
138 | else ["False"] in | |
139 | match x with | |
140 | True -> None | |
141 | | False when strict -> | |
142 | failwith "False should not be in the final result. Perhaps your rule doesn't contain any +/-/* code" | |
143 | | _ -> Some (loop x) | |
144 | ||
951c7801 C |
145 | let interpret_google strict x = |
146 | (* convert to dnf *) | |
147 | let rec dnf = function | |
148 | Elem x -> [x] | |
149 | | Or l -> List.fold_left Common.union_set [] (List.map dnf l) | |
150 | | And l -> | |
151 | let l = List.map dnf l in | |
152 | List.fold_left | |
153 | (function prev -> | |
154 | function cur -> | |
155 | List.fold_left Common.union_set [] | |
156 | (List.map | |
157 | (function x -> | |
158 | List.map (function y -> Printf.sprintf "%s %s" x y) prev) | |
159 | cur)) | |
160 | [] l | |
161 | | True -> ["True"] | |
162 | | False -> | |
163 | if strict | |
164 | then failwith "False should not be in the final result. Perhaps your rule doesn't contain any +/-/* code" | |
165 | else ["False"] in | |
166 | match x with | |
167 | True -> None | |
168 | | False when strict -> | |
169 | failwith "False should not be in the final result. Perhaps your rule doesn't contain any +/-/* code" | |
170 | | _ -> Some (dnf x) | |
171 | ||
34e49164 | 172 | let combine2c x = |
90aeb998 | 173 | match interpret_glimpse false x with |
34e49164 | 174 | None -> "None" |
951c7801 | 175 | | Some x -> String.concat " || " x |
34e49164 C |
176 | |
177 | let norm = function | |
178 | And l -> And (List.sort compare l) | |
179 | | Or l -> Or (List.sort compare l) | |
180 | | x -> x | |
181 | ||
182 | let rec merge l1 l2 = | |
183 | match (l1,l2) with | |
184 | ([],l2) -> l2 | |
185 | | (l1,[]) -> l1 | |
186 | | (x::xs,y::ys) -> | |
187 | (match compare x y with | |
188 | -1 -> x::(merge xs l2) | |
189 | | 0 -> x::(merge xs ys) | |
190 | | 1 -> y::(merge l1 ys) | |
191 | | _ -> failwith "not possible") | |
192 | ||
193 | let intersect l1 l2 = List.filter (function l1e -> List.mem l1e l2) l1 | |
194 | ||
195 | let minus_set l1 l2 = List.filter (function l1e -> not (List.mem l1e l2)) l1 | |
196 | ||
197 | let rec insert x l = merge [x] l | |
198 | ||
199 | let rec build_and x y = | |
200 | if x = y | |
201 | then x | |
202 | else | |
203 | match (x,y) with | |
204 | (True,x) | (x,True) -> x | |
205 | | (False,x) | (x,False) -> False | |
206 | | (And l1,And l2) -> And (merge l1 l2) | |
207 | | (x,Or l) when List.mem x l -> x | |
208 | | (Or l,x) when List.mem x l -> x | |
209 | | (Or l1,Or l2) when not ((intersect l1 l2) = []) -> | |
210 | let inner = | |
211 | build_and | |
212 | (List.fold_left build_or False (minus_set l1 l2)) | |
213 | (List.fold_left build_or False (minus_set l2 l1)) in | |
214 | List.fold_left build_or inner (intersect l1 l2) | |
215 | | (x,And l) | (And l,x) -> | |
216 | if List.mem x l | |
217 | then And l | |
218 | else | |
219 | let others = | |
220 | List.filter | |
221 | (function | |
222 | Or l -> not(List.mem x l) | |
223 | | _ -> true) | |
224 | l in | |
225 | And (insert x others) | |
226 | | (x,y) -> norm(And [x;y]) | |
227 | ||
228 | and build_or x y = | |
229 | if x = y | |
230 | then x | |
231 | else | |
232 | match (x,y) with | |
233 | (True,x) | (x,True) -> True | |
234 | | (False,x) | (x,False) -> x | |
235 | | (Or l1,Or l2) -> Or (merge l1 l2) | |
236 | | (x,And l) when List.mem x l -> x | |
237 | | (And l,x) when List.mem x l -> x | |
238 | | (And l1,And l2) when not ((intersect l1 l2) = []) -> | |
239 | let inner = | |
240 | build_or | |
241 | (List.fold_left build_and True (minus_set l1 l2)) | |
242 | (List.fold_left build_and True (minus_set l2 l1)) in | |
243 | List.fold_left build_and inner (intersect l1 l2) | |
244 | | (x,Or l) | (Or l,x) -> | |
245 | if List.mem x l | |
246 | then Or l | |
247 | else | |
248 | let others = | |
249 | List.filter | |
250 | (function | |
251 | And l -> not(List.mem x l) | |
252 | | _ -> true) | |
253 | l in | |
254 | Or (insert x others) | |
255 | | (x,y) -> norm(Or [x;y]) | |
256 | ||
257 | let keep x = Elem x | |
258 | let drop x = True | |
259 | ||
260 | let do_get_constants constants keywords env neg_pos = | |
261 | let donothing r k e = k e in | |
262 | let option_default = True in | |
263 | let bind = build_and in | |
264 | let inherited ((nm1,_) as x) = | |
ae4735db C |
265 | (* ignore virtuals *) |
266 | if nm1 = "virtual" then option_default | |
34e49164 | 267 | (* perhaps inherited, but value not required, so no constraints *) |
ae4735db C |
268 | else if List.mem x neg_pos then option_default |
269 | else (try List.assoc nm1 env with Not_found -> False) in | |
34e49164 C |
270 | let minherited name = inherited (Ast.unwrap_mcode name) in |
271 | let mcode _ x = | |
272 | match Ast.get_pos_var x with | |
273 | Ast.MetaPos(name,constraints,_,keep,inh) -> minherited name | |
274 | | _ -> option_default in | |
275 | ||
276 | (* if one branch gives no information, then we have to take anything *) | |
277 | let disj_union_all = List.fold_left build_or False in | |
278 | ||
279 | let ident r k i = | |
280 | match Ast.unwrap i with | |
281 | Ast.Id(name) -> | |
282 | bind (k i) | |
283 | (match Ast.unwrap_mcode name with | |
284 | "NULL" -> keywords "NULL" | |
285 | | nm -> constants nm) | |
286 | | Ast.MetaId(name,_,_,_) | Ast.MetaFunc(name,_,_,_) | |
287 | | Ast.MetaLocalFunc(name,_,_,_) -> bind (k i) (minherited name) | |
288 | | _ -> k i in | |
289 | ||
290 | let rec type_collect res = function | |
291 | TC.ConstVol(_,ty) | TC.Pointer(ty) | TC.FunctionPointer(ty) | |
292 | | TC.Array(ty) -> type_collect res ty | |
ae4735db C |
293 | | TC.MetaType(tyname,_,_) -> |
294 | inherited tyname | |
34e49164 | 295 | | TC.TypeName(s) -> constants s |
e6509c05 C |
296 | | TC.EnumName(TC.Name s) -> constants s |
297 | | TC.StructUnionName(_,TC.Name s) -> constants s | |
34e49164 C |
298 | | ty -> res in |
299 | ||
300 | (* no point to do anything special for records because glimpse is | |
301 | word-oriented *) | |
302 | let expression r k e = | |
303 | match Ast.unwrap e with | |
304 | Ast.Constant(const) -> | |
305 | bind (k e) | |
306 | (match Ast.unwrap_mcode const with | |
307 | Ast.String s -> constants s | |
308 | | Ast.Char "\\0" -> option_default (* glimpse doesn't like it *) | |
fc1ad971 | 309 | | Ast.Char s -> option_default (* probably not chars either *) |
34e49164 | 310 | (* the following were eg keywords "1", but not good for glimpse *) |
fc1ad971 C |
311 | | Ast.Int s -> option_default (* glimpse doesn't index integers *) |
312 | | Ast.Float s -> option_default (* probably not floats either *)) | |
34e49164 C |
313 | | Ast.MetaExpr(name,_,_,Some type_list,_,_) -> |
314 | let types = List.fold_left type_collect option_default type_list in | |
315 | bind (k e) (bind (minherited name) types) | |
316 | | Ast.MetaErr(name,_,_,_) | Ast.MetaExpr(name,_,_,_,_,_) -> | |
317 | bind (k e) (minherited name) | |
88e71198 | 318 | | Ast.MetaExprList(name,Ast.MetaListLen (lenname,_,_),_,_) -> |
34e49164 | 319 | bind (k e) (bind (minherited name) (minherited lenname)) |
88e71198 | 320 | | Ast.MetaExprList(name,_,_,_) -> minherited name |
34e49164 C |
321 | | Ast.SizeOfExpr(sizeof,exp) -> bind (keywords "sizeof") (k e) |
322 | | Ast.SizeOfType(sizeof,lp,ty,rp) -> bind (keywords "sizeof") (k e) | |
5636bb2c C |
323 | | Ast.NestExpr(starter,expr_dots,ender,wc,false) -> option_default |
324 | | Ast.NestExpr(starter,expr_dots,ender,wc,true) -> | |
34e49164 C |
325 | r.V.combiner_expression_dots expr_dots |
326 | | Ast.DisjExpr(exps) -> | |
327 | disj_union_all (List.map r.V.combiner_expression exps) | |
328 | | Ast.OptExp(exp) -> option_default | |
329 | | Ast.Edots(_,_) | Ast.Ecircles(_,_) | Ast.Estars(_,_) -> option_default | |
330 | | _ -> k e in | |
faf9a90c | 331 | |
34e49164 C |
332 | let fullType r k ft = |
333 | match Ast.unwrap ft with | |
334 | Ast.DisjType(decls) -> | |
335 | disj_union_all (List.map r.V.combiner_fullType decls) | |
336 | | Ast.OptType(ty) -> option_default | |
337 | | _ -> k ft in | |
faf9a90c | 338 | |
34e49164 C |
339 | let baseType = function |
340 | Ast.VoidType -> keywords "void " | |
341 | | Ast.CharType -> keywords "char " | |
342 | | Ast.ShortType -> keywords "short " | |
343 | | Ast.IntType -> keywords "int " | |
344 | | Ast.DoubleType -> keywords "double " | |
345 | | Ast.FloatType -> keywords "float " | |
1eddfd50 C |
346 | | Ast.LongType | Ast.LongLongType -> keywords "long " |
347 | | Ast.SizeType -> keywords "size_t " | |
348 | | Ast.SSizeType -> keywords "ssize_t " | |
349 | | Ast.PtrDiffType -> keywords "ptrdiff_t " in | |
34e49164 C |
350 | |
351 | let typeC r k ty = | |
352 | match Ast.unwrap ty with | |
faf9a90c | 353 | Ast.BaseType(ty1,strings) -> bind (k ty) (baseType ty1) |
34e49164 C |
354 | | Ast.TypeName(name) -> bind (k ty) (constants (Ast.unwrap_mcode name)) |
355 | | Ast.MetaType(name,_,_) -> bind (minherited name) (k ty) | |
356 | | _ -> k ty in | |
357 | ||
358 | let declaration r k d = | |
359 | match Ast.unwrap d with | |
413ffc02 C |
360 | Ast.MetaDecl(name,_,_) | Ast.MetaField(name,_,_) -> |
361 | bind (k d) (minherited name) | |
362 | | Ast.DisjDecl(decls) -> | |
34e49164 C |
363 | disj_union_all (List.map r.V.combiner_declaration decls) |
364 | | Ast.OptDecl(decl) -> option_default | |
365 | | Ast.Ddots(dots,whencode) -> option_default | |
366 | | _ -> k d in | |
367 | ||
368 | let initialiser r k i = | |
369 | match Ast.unwrap i with | |
370 | Ast.OptIni(ini) -> option_default | |
371 | | _ -> k i in | |
372 | ||
373 | let parameter r k p = | |
374 | match Ast.unwrap p with | |
375 | Ast.OptParam(param) -> option_default | |
376 | | Ast.MetaParam(name,_,_) -> bind (k p) (minherited name) | |
88e71198 | 377 | | Ast.MetaParamList(name,Ast.MetaListLen(lenname,_,_),_,_) -> |
34e49164 | 378 | bind (minherited name) (bind (minherited lenname) (k p)) |
88e71198 | 379 | | Ast.MetaParamList(name,_,_,_) -> bind (k p) (minherited name) |
34e49164 | 380 | | _ -> k p in |
faf9a90c | 381 | |
34e49164 C |
382 | let rule_elem r k re = |
383 | match Ast.unwrap re with | |
384 | Ast.MetaRuleElem(name,_,_) | Ast.MetaStmt(name,_,_,_) | |
385 | | Ast.MetaStmtList(name,_,_) -> bind (minherited name) (k re) | |
386 | | Ast.WhileHeader(whl,lp,exp,rp) -> | |
387 | bind (keywords "while") (k re) | |
388 | | Ast.WhileTail(whl,lp,exp,rp,sem) -> | |
389 | bind (keywords "do") (k re) | |
390 | | Ast.ForHeader(fr,lp,e1,sem1,e2,sem2,e3,rp) -> | |
391 | bind (keywords "for") (k re) | |
392 | | Ast.SwitchHeader(switch,lp,exp,rp) -> | |
393 | bind (keywords "switch") (k re) | |
394 | | Ast.Break(br,sem) -> | |
395 | bind (keywords "break") (k re) | |
396 | | Ast.Continue(cont,sem) -> | |
397 | bind (keywords "continue") (k re) | |
398 | | Ast.Goto(_,i,_) -> | |
399 | bind (keywords "goto") (k re) | |
400 | | Ast.Default(def,colon) -> | |
401 | bind (keywords "default") (k re) | |
402 | | Ast.Include(inc,s) -> | |
403 | bind (k re) | |
404 | (match Ast.unwrap_mcode s with | |
405 | Ast.Local l | Ast.NonLocal l -> | |
406 | let strings = | |
407 | List.fold_left | |
408 | (function prev -> | |
409 | function | |
410 | (* just take the last thing, probably the most | |
411 | specific. everything is necessary anyway. *) | |
412 | Ast.IncPath s -> [Elem s] | |
413 | | Ast.IncDots -> prev) | |
414 | [] l in | |
415 | (match strings with | |
416 | [] -> True | |
417 | | x::xs -> List.fold_left bind x xs)) | |
418 | | Ast.DisjRuleElem(res) -> | |
419 | disj_union_all (List.map r.V.combiner_rule_elem res) | |
420 | | _ -> k re in | |
faf9a90c | 421 | |
34e49164 C |
422 | let statement r k s = |
423 | match Ast.unwrap s with | |
424 | Ast.Disj(stmt_dots) -> | |
425 | disj_union_all (List.map r.V.combiner_statement_dots stmt_dots) | |
5636bb2c C |
426 | | Ast.Nest(starter,stmt_dots,ender,whn,false,_,_) -> option_default |
427 | | Ast.Nest(starter,stmt_dots,ender,whn,true,_,_) -> | |
34e49164 C |
428 | r.V.combiner_statement_dots stmt_dots |
429 | | Ast.OptStm(s) -> option_default | |
430 | | Ast.Dots(d,whn,_,_) | Ast.Circles(d,whn,_,_) | Ast.Stars(d,whn,_,_) -> | |
431 | option_default | |
432 | | _ -> k s in | |
433 | ||
434 | V.combiner bind option_default | |
435 | mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode | |
c491d8ee | 436 | donothing donothing donothing donothing donothing |
34e49164 C |
437 | ident expression fullType typeC initialiser parameter declaration |
438 | rule_elem statement donothing donothing donothing | |
439 | ||
440 | (* ------------------------------------------------------------------------ *) | |
441 | ||
442 | let filter_combine combine to_drop = | |
443 | let rec and_loop = function | |
444 | Elem x when List.mem x to_drop -> True | |
445 | | Or l -> List.fold_left build_or False (List.map or_loop l) | |
446 | | x -> x | |
447 | and or_loop = function | |
448 | Elem x when List.mem x to_drop -> False | |
449 | | And l -> List.fold_left build_and True (List.map and_loop l) | |
450 | | x -> x in | |
451 | or_loop combine | |
452 | ||
453 | (* ------------------------------------------------------------------------ *) | |
454 | ||
455 | let get_all_constants minus_only = | |
456 | let donothing r k e = k e in | |
457 | let bind = Common.union_set in | |
458 | let option_default = [] in | |
459 | let mcode r (x,_,mcodekind,_) = | |
460 | match mcodekind with | |
708f4980 | 461 | Ast.MINUS(_,_,_,_) -> [x] |
34e49164 C |
462 | | _ when minus_only -> [] |
463 | | _ -> [x] in | |
464 | let other r _ = [] in | |
465 | ||
466 | V.combiner bind option_default | |
467 | other mcode other other other other other other other other other other | |
34e49164 | 468 | |
c491d8ee | 469 | donothing donothing donothing donothing donothing |
34e49164 C |
470 | donothing donothing donothing donothing donothing donothing donothing |
471 | donothing donothing donothing donothing donothing | |
472 | ||
473 | (* ------------------------------------------------------------------------ *) | |
474 | ||
475 | let get_plus_constants = | |
476 | let donothing r k e = k e in | |
477 | let bind = Common.union_set in | |
478 | let option_default = [] in | |
90aeb998 C |
479 | |
480 | let recurse l = | |
481 | List.fold_left | |
482 | (List.fold_left | |
483 | (function prev -> | |
484 | function cur -> | |
485 | bind ((get_all_constants false).V.combiner_anything cur) prev)) | |
486 | [] l in | |
487 | let process_mcodekind = function | |
708f4980 | 488 | Ast.MINUS(_,_,_,anythings) -> recurse anythings |
951c7801 C |
489 | | Ast.CONTEXT(_,Ast.BEFORE(a,_)) -> recurse a |
490 | | Ast.CONTEXT(_,Ast.AFTER(a,_)) -> recurse a | |
491 | | Ast.CONTEXT(_,Ast.BEFOREAFTER(a1,a2,_)) -> | |
34e49164 C |
492 | Common.union_set (recurse a1) (recurse a2) |
493 | | _ -> [] in | |
494 | ||
90aeb998 C |
495 | let mcode r mc = process_mcodekind (Ast.get_mcodekind mc) in |
496 | let end_info (_,_,_,mc) = process_mcodekind mc in | |
497 | ||
498 | let rule_elem r k e = | |
499 | match Ast.unwrap e with | |
500 | Ast.FunHeader(bef,_,_,_,_,_,_) | |
501 | | Ast.Decl(bef,_,_) -> bind (process_mcodekind bef) (k e) | |
502 | | _ -> k e in | |
503 | ||
504 | let statement r k e = | |
505 | match Ast.unwrap e with | |
506 | Ast.IfThen(_,_,ei) | Ast.IfThenElse(_,_,_,_,ei) | |
507 | | Ast.While(_,_,ei) | Ast.For(_,_,ei) | |
508 | | Ast.Iterator(_,_,ei) -> bind (k e) (end_info ei) | |
509 | | _ -> k e in | |
510 | ||
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511 | V.combiner bind option_default |
512 | mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode | |
c491d8ee | 513 | donothing donothing donothing donothing donothing |
34e49164 | 514 | donothing donothing donothing donothing donothing donothing donothing |
90aeb998 | 515 | rule_elem statement donothing donothing donothing |
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516 | |
517 | (* ------------------------------------------------------------------------ *) | |
518 | ||
519 | (* true means the rule should be analyzed, false means it should be ignored *) | |
520 | let rec dependencies env = function | |
521 | Ast.Dep s -> (try List.assoc s env with Not_found -> False) | |
522 | | Ast.AntiDep s -> True | |
523 | | Ast.EverDep s -> (try List.assoc s env with Not_found -> False) | |
524 | | Ast.NeverDep s -> True | |
525 | | Ast.AndDep (d1,d2) -> build_and (dependencies env d1) (dependencies env d2) | |
526 | | Ast.OrDep (d1,d2) -> build_or (dependencies env d1) (dependencies env d2) | |
527 | | Ast.NoDep -> True | |
7f004419 | 528 | | Ast.FailDep -> False |
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529 | |
530 | (* ------------------------------------------------------------------------ *) | |
531 | ||
532 | let all_context = | |
533 | let bind x y = x && y in | |
534 | let option_default = true in | |
535 | ||
536 | let donothing recursor k e = k e in | |
537 | ||
90aeb998 | 538 | let process_mcodekind = function |
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539 | Ast.CONTEXT(_,Ast.NOTHING) -> true |
540 | | _ -> false in | |
541 | ||
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542 | let mcode r e = process_mcodekind (Ast.get_mcodekind e) in |
543 | ||
544 | let end_info (_,_,_,mc) = process_mcodekind mc in | |
545 | ||
546 | let initialiser r k e = | |
547 | match Ast.unwrap e with | |
c491d8ee | 548 | Ast.StrInitList(all_minus,_,_,_,_) -> |
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549 | not all_minus && k e |
550 | | _ -> k e in | |
551 | ||
552 | let rule_elem r k e = | |
553 | match Ast.unwrap e with | |
554 | Ast.FunHeader(bef,_,_,_,_,_,_) | |
555 | | Ast.Decl(bef,_,_) -> bind (process_mcodekind bef) (k e) | |
556 | | _ -> k e in | |
557 | ||
558 | let statement r k e = | |
559 | match Ast.unwrap e with | |
560 | Ast.IfThen(_,_,ei) | Ast.IfThenElse(_,_,_,_,ei) | |
561 | | Ast.While(_,_,ei) | Ast.For(_,_,ei) | |
562 | | Ast.Iterator(_,_,ei) -> bind (k e) (end_info ei) | |
563 | | _ -> k e in | |
564 | ||
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565 | V.combiner bind option_default |
566 | mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode mcode | |
c491d8ee | 567 | donothing donothing donothing donothing donothing |
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568 | donothing donothing donothing donothing initialiser donothing |
569 | donothing rule_elem statement donothing donothing donothing | |
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570 | |
571 | (* ------------------------------------------------------------------------ *) | |
572 | ||
573 | let rule_fn tls in_plus env neg_pos = | |
574 | List.fold_left | |
575 | (function (rest_info,in_plus) -> | |
576 | function (cur,neg_pos) -> | |
577 | let minuses = | |
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578 | let getter = do_get_constants keep drop env neg_pos in |
579 | getter.V.combiner_top_level cur in | |
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580 | let all_minuses = |
581 | if !Flag.sgrep_mode2 | |
582 | then [] (* nothing removed for sgrep *) | |
583 | else (get_all_constants true).V.combiner_top_level cur in | |
584 | let plusses = get_plus_constants.V.combiner_top_level cur in | |
585 | (* the following is for eg -foo(2) +foo(x) then in another rule | |
586 | -foo(10); don't want to consider that foo is guaranteed to be | |
587 | created by the rule. not sure this works completely: what if foo is | |
588 | in both - and +, but in an or, so the cases aren't related? | |
589 | not sure this whole thing is a good idea. how do we know that | |
590 | something that is only in plus is really freshly created? *) | |
591 | let plusses = Common.minus_set plusses all_minuses in | |
592 | let was_bot = minuses = True in | |
593 | let new_minuses = filter_combine minuses in_plus in | |
594 | let new_plusses = Common.union_set plusses in_plus in | |
595 | (* perhaps it should be build_and here? we don't realy have multiple | |
596 | minirules anymore anyway. *) | |
597 | match new_minuses with | |
598 | True -> | |
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599 | let getter = do_get_constants drop keep env neg_pos in |
600 | let retry = getter.V.combiner_top_level cur in | |
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601 | (match retry with |
602 | True when not was_bot -> (rest_info, new_plusses) | |
603 | | x -> (build_or x rest_info, new_plusses)) | |
604 | | x -> (build_or x rest_info, new_plusses)) | |
605 | (False,in_plus) (List.combine tls neg_pos) | |
606 | ||
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607 | let run rules neg_pos_vars = |
608 | let (info,_,_,_) = | |
609 | List.fold_left | |
610 | (function (rest_info,in_plus,env,locals(*dom of env*)) -> | |
611 | function | |
413ffc02 | 612 | (Ast.ScriptRule (nm,_,deps,mv,_,_),_) -> |
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613 | let extra_deps = |
614 | List.fold_left | |
615 | (function prev -> | |
174d1640 | 616 | function (_,(rule,_),_) -> |
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617 | if rule = "virtual" |
618 | then prev | |
619 | else Ast.AndDep (Ast.Dep rule,prev)) | |
620 | deps mv in | |
621 | (match dependencies env extra_deps with | |
413ffc02 | 622 | False -> (rest_info, in_plus, (nm,True)::env, nm::locals) |
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623 | | dependencies -> |
624 | (build_or dependencies rest_info, in_plus, env, locals)) | |
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625 | | (Ast.InitialScriptRule (_,_,deps,_),_) |
626 | | (Ast.FinalScriptRule (_,_,deps,_),_) -> | |
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627 | (* initialize and finalize dependencies are irrelevant to |
628 | get_constants *) | |
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629 | (rest_info, in_plus, env, locals) |
630 | | (Ast.CocciRule (nm,(dep,_,_),cur,_,_),neg_pos_vars) -> | |
631 | let (cur_info,cur_plus) = | |
632 | rule_fn cur in_plus ((nm,True)::env) | |
633 | neg_pos_vars in | |
634 | (match dependencies env dep with | |
635 | False -> (rest_info,cur_plus,env,locals) | |
636 | | dependencies -> | |
637 | if List.for_all all_context.V.combiner_top_level cur | |
638 | then (rest_info,cur_plus,(nm,cur_info)::env,nm::locals) | |
639 | else | |
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640 | (* no constants if dependent on another rule; then we need to |
641 | find the constants of that rule *) | |
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642 | (build_or (build_and dependencies cur_info) rest_info, |
643 | cur_plus,env,locals))) | |
644 | (False,[],[],[]) | |
645 | (List.combine (rules : Ast.rule list) neg_pos_vars) in | |
646 | info | |
647 | ||
648 | let get_constants rules neg_pos_vars = | |
649 | match !Flag.scanner with | |
1eddfd50 | 650 | Flag.NoScanner -> (None,None,None) |
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651 | | Flag.Grep -> |
652 | let res = run rules neg_pos_vars in | |
1eddfd50 | 653 | (interpret_grep true res,None,None) |
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654 | | Flag.Glimpse -> |
655 | let res = run rules neg_pos_vars in | |
1eddfd50 | 656 | (interpret_grep true res,interpret_glimpse true res,None) |
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657 | | Flag.Google _ -> |
658 | let res = run rules neg_pos_vars in | |
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659 | (interpret_grep true res,interpret_google true res,None) |
660 | | Flag.IdUtils _ -> | |
661 | let res = run rules neg_pos_vars in | |
662 | (interpret_grep true res,None,Some res) | |
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