| 1 | (* |
| 2 | * Copyright 2005-2008, Ecole des Mines de Nantes, University of Copenhagen |
| 3 | * Yoann Padioleau, Julia Lawall, Rene Rydhof Hansen, Henrik Stuart, Gilles Muller |
| 4 | * This file is part of Coccinelle. |
| 5 | * |
| 6 | * Coccinelle is free software: you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation, according to version 2 of the License. |
| 9 | * |
| 10 | * Coccinelle is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with Coccinelle. If not, see <http://www.gnu.org/licenses/>. |
| 17 | * |
| 18 | * The authors reserve the right to distribute this or future versions of |
| 19 | * Coccinelle under other licenses. |
| 20 | *) |
| 21 | |
| 22 | |
| 23 | open Common |
| 24 | |
| 25 | (*****************************************************************************) |
| 26 | (* The functor argument *) |
| 27 | (*****************************************************************************) |
| 28 | |
| 29 | (* info passed recursively in monad in addition to binding *) |
| 30 | type xinfo = { |
| 31 | optional_storage_iso : bool; |
| 32 | optional_qualifier_iso : bool; |
| 33 | value_format_iso : bool; |
| 34 | } |
| 35 | |
| 36 | module XMATCH = struct |
| 37 | |
| 38 | (* ------------------------------------------------------------------------*) |
| 39 | (* Combinators history *) |
| 40 | (* ------------------------------------------------------------------------*) |
| 41 | (* |
| 42 | * version0: |
| 43 | * type ('a, 'b) matcher = 'a -> 'b -> bool |
| 44 | * |
| 45 | * version1: same but with a global variable holding the current binding |
| 46 | * BUT bug |
| 47 | * - can have multiple possibilities |
| 48 | * - globals sux |
| 49 | * - sometimes have to undo, cos if start match, then it binds, |
| 50 | * and if later it does not match, then must undo the first binds. |
| 51 | * ex: when match parameters, can try to match, but then we found far |
| 52 | * later that the last argument of a function does not match |
| 53 | * => have to uando the binding !!! |
| 54 | * (can handle that too with a global, by saving the |
| 55 | * global, ... but sux) |
| 56 | * => better not use global |
| 57 | * |
| 58 | * version2: |
| 59 | * type ('a, 'b) matcher = binding -> 'a -> 'b -> binding list |
| 60 | * |
| 61 | * Empty list mean failure (let matchfailure = []). |
| 62 | * To be able to have pretty code, have to use partial application |
| 63 | * powa, and so the type is in fact |
| 64 | * |
| 65 | * version3: |
| 66 | * type ('a, 'b) matcher = 'a -> 'b -> binding -> binding list |
| 67 | * |
| 68 | * Then by defining the correct combinators, can have quite pretty code (that |
| 69 | * looks like the clean code of version0). |
| 70 | * |
| 71 | * opti: return a lazy list of possible matchs ? |
| 72 | * |
| 73 | * version4: type tin = Lib_engine.metavars_binding |
| 74 | *) |
| 75 | |
| 76 | (* ------------------------------------------------------------------------*) |
| 77 | (* Standard type and operators *) |
| 78 | (* ------------------------------------------------------------------------*) |
| 79 | |
| 80 | type tin = { |
| 81 | extra: xinfo; |
| 82 | binding: Lib_engine.metavars_binding; |
| 83 | binding0: Lib_engine.metavars_binding; (* inherited bindings *) |
| 84 | } |
| 85 | (* 'x is a ('a * 'b) but in fact dont care about 'b, we just tag the SP *) |
| 86 | (* opti? use set instead of list *) |
| 87 | type 'x tout = ('x * Lib_engine.metavars_binding) list |
| 88 | |
| 89 | type ('a, 'b) matcher = 'a -> 'b -> tin -> ('a * 'b) tout |
| 90 | |
| 91 | (* was >&&> *) |
| 92 | let (>>=) m1 m2 = fun tin -> |
| 93 | let xs = m1 tin in |
| 94 | let xxs = xs +> List.map (fun ((a,b), binding) -> |
| 95 | m2 a b {tin with binding = binding} |
| 96 | ) in |
| 97 | List.flatten xxs |
| 98 | |
| 99 | (* Je compare les bindings retournés par les differentes branches. |
| 100 | * Si la deuxieme branche amene a des bindings qui sont deja presents |
| 101 | * dans la premiere branche, alors je ne les accepte pas. |
| 102 | * |
| 103 | * update: still useful now that julia better handle Exp directly via |
| 104 | * ctl tricks using positions ? |
| 105 | *) |
| 106 | let (>|+|>) m1 m2 = fun tin -> |
| 107 | (* CHOICE |
| 108 | let xs = m1 tin in |
| 109 | if null xs |
| 110 | then m2 tin |
| 111 | else xs |
| 112 | *) |
| 113 | let res1 = m1 tin in |
| 114 | let res2 = m2 tin in |
| 115 | let list_bindings_already = List.map snd res1 in |
| 116 | res1 ++ |
| 117 | (res2 +> List.filter (fun (x, binding) -> |
| 118 | not |
| 119 | (list_bindings_already +> List.exists (fun already -> |
| 120 | Lib_engine.equal_binding binding already)) |
| 121 | )) |
| 122 | |
| 123 | |
| 124 | |
| 125 | |
| 126 | let (>||>) m1 m2 = fun tin -> |
| 127 | (* CHOICE |
| 128 | let xs = m1 tin in |
| 129 | if null xs |
| 130 | then m2 tin |
| 131 | else xs |
| 132 | *) |
| 133 | (* opti? use set instead of list *) |
| 134 | m1 tin ++ m2 tin |
| 135 | |
| 136 | |
| 137 | let return res = fun tin -> |
| 138 | [res, tin.binding] |
| 139 | |
| 140 | let fail = fun tin -> |
| 141 | [] |
| 142 | |
| 143 | let (>&&>) f m = fun tin -> |
| 144 | if f tin |
| 145 | then m tin |
| 146 | else fail tin |
| 147 | |
| 148 | |
| 149 | let mode = Cocci_vs_c_3.PatternMode |
| 150 | |
| 151 | (* ------------------------------------------------------------------------*) |
| 152 | (* Exp *) |
| 153 | (* ------------------------------------------------------------------------*) |
| 154 | let cocciExp = fun expf expa node -> fun tin -> |
| 155 | |
| 156 | let globals = ref [] in |
| 157 | let bigf = { |
| 158 | (* julia's style *) |
| 159 | Visitor_c.default_visitor_c with |
| 160 | Visitor_c.kexpr = (fun (k, bigf) expb -> |
| 161 | match expf expa expb tin with |
| 162 | | [] -> (* failed *) k expb |
| 163 | | xs -> |
| 164 | globals := xs @ !globals; |
| 165 | if not !Flag_engine.disallow_nested_exps then k expb (* CHOICE *) |
| 166 | ); |
| 167 | (* pad's style. |
| 168 | * push2 expr globals; k expr |
| 169 | * ... |
| 170 | * !globals +> List.fold_left (fun acc e -> acc >||> match_e_e expr e) |
| 171 | * (return false) |
| 172 | * |
| 173 | *) |
| 174 | } |
| 175 | in |
| 176 | Visitor_c.vk_node bigf node; |
| 177 | !globals +> List.map (fun ((a, _exp), binding) -> |
| 178 | (a, node), binding |
| 179 | ) |
| 180 | |
| 181 | (* same as cocciExp, but for expressions in an expression, not expressions |
| 182 | in a node *) |
| 183 | let cocciExpExp = fun expf expa expb -> fun tin -> |
| 184 | |
| 185 | let globals = ref [] in |
| 186 | let bigf = { |
| 187 | (* julia's style *) |
| 188 | Visitor_c.default_visitor_c with |
| 189 | Visitor_c.kexpr = (fun (k, bigf) expb -> |
| 190 | match expf expa expb tin with |
| 191 | | [] -> (* failed *) k expb |
| 192 | | xs -> |
| 193 | globals := xs @ !globals; |
| 194 | if not !Flag_engine.disallow_nested_exps then k expb (* CHOICE *) |
| 195 | ); |
| 196 | (* pad's style. |
| 197 | * push2 expr globals; k expr |
| 198 | * ... |
| 199 | * !globals +> List.fold_left (fun acc e -> acc >||> match_e_e expr e) |
| 200 | * (return false) |
| 201 | * |
| 202 | *) |
| 203 | } |
| 204 | in |
| 205 | Visitor_c.vk_expr bigf expb; |
| 206 | !globals +> List.map (fun ((a, _exp), binding) -> |
| 207 | (a, expb), binding |
| 208 | ) |
| 209 | |
| 210 | let cocciTy = fun expf expa node -> fun tin -> |
| 211 | |
| 212 | let globals = ref [] in |
| 213 | let bigf = { |
| 214 | Visitor_c.default_visitor_c with |
| 215 | Visitor_c.ktype = (fun (k, bigf) expb -> |
| 216 | match expf expa expb tin with |
| 217 | | [] -> (* failed *) k expb |
| 218 | | xs -> globals := xs @ !globals); |
| 219 | |
| 220 | } |
| 221 | in |
| 222 | Visitor_c.vk_node bigf node; |
| 223 | !globals +> List.map (fun ((a, _exp), binding) -> |
| 224 | (a, node), binding |
| 225 | ) |
| 226 | |
| 227 | |
| 228 | (* ------------------------------------------------------------------------*) |
| 229 | (* Distribute mcode *) |
| 230 | (* ------------------------------------------------------------------------*) |
| 231 | let tag_mck_pos mck posmck = |
| 232 | match mck with |
| 233 | | Ast_cocci.PLUS -> Ast_cocci.PLUS |
| 234 | | Ast_cocci.CONTEXT (pos, xs) -> |
| 235 | assert (pos = Ast_cocci.NoPos || pos = Ast_cocci.DontCarePos); |
| 236 | Ast_cocci.CONTEXT (posmck, xs) |
| 237 | | Ast_cocci.MINUS (pos, xs) -> |
| 238 | assert (pos = Ast_cocci.NoPos || pos = Ast_cocci.DontCarePos); |
| 239 | Ast_cocci.MINUS (posmck, xs) |
| 240 | |
| 241 | |
| 242 | let tag_mck_pos_mcode (x,info,mck,pos) posmck stuff = fun tin -> |
| 243 | [((x, info, tag_mck_pos mck posmck, pos),stuff), tin.binding] |
| 244 | |
| 245 | |
| 246 | let distrf (ii_of_x_f) = |
| 247 | fun mcode x -> fun tin -> |
| 248 | let (max, min) = Lib_parsing_c.max_min_by_pos (ii_of_x_f x) |
| 249 | in |
| 250 | let posmck = Ast_cocci.FixPos (min, max) (* subtil: and not max, min !!*) |
| 251 | in |
| 252 | tag_mck_pos_mcode mcode posmck x tin |
| 253 | |
| 254 | let distrf_e = distrf (Lib_parsing_c.ii_of_expr) |
| 255 | let distrf_args = distrf (Lib_parsing_c.ii_of_args) |
| 256 | let distrf_type = distrf (Lib_parsing_c.ii_of_type) |
| 257 | let distrf_param = distrf (Lib_parsing_c.ii_of_param) |
| 258 | let distrf_params = distrf (Lib_parsing_c.ii_of_params) |
| 259 | let distrf_ini = distrf (Lib_parsing_c.ii_of_ini) |
| 260 | let distrf_node = distrf (Lib_parsing_c.ii_of_node) |
| 261 | let distrf_struct_fields = distrf (Lib_parsing_c.ii_of_struct_fields) |
| 262 | let distrf_cst = distrf (Lib_parsing_c.ii_of_cst) |
| 263 | let distrf_define_params = distrf (Lib_parsing_c.ii_of_define_params) |
| 264 | |
| 265 | |
| 266 | (* ------------------------------------------------------------------------*) |
| 267 | (* Constraints on metavariable values *) |
| 268 | (* ------------------------------------------------------------------------*) |
| 269 | let check_constraints matcher constraints exp = fun f tin -> |
| 270 | let rec loop = function |
| 271 | [] -> f () tin (* success *) |
| 272 | | c::cs -> |
| 273 | match matcher c exp tin with |
| 274 | [] (* failure *) -> loop cs |
| 275 | | _ (* success *) -> fail tin in |
| 276 | loop constraints |
| 277 | |
| 278 | let check_pos_constraints constraints pvalu f tin = |
| 279 | check_constraints |
| 280 | (fun c exp tin -> |
| 281 | let success = [[]] in |
| 282 | let failure = [] in |
| 283 | (* relies on the fact that constraints on pos variables must refer to |
| 284 | inherited variables *) |
| 285 | (match Common.optionise (fun () -> tin.binding0 +> List.assoc c) with |
| 286 | Some valu' -> |
| 287 | if Cocci_vs_c_3.equal_metavarval exp valu' |
| 288 | then success else failure |
| 289 | | None -> |
| 290 | (* if the variable is not there, it puts no constraints *) |
| 291 | (* not sure this is still useful *) |
| 292 | failure)) |
| 293 | constraints pvalu f tin |
| 294 | |
| 295 | (* ------------------------------------------------------------------------*) |
| 296 | (* Environment *) |
| 297 | (* ------------------------------------------------------------------------*) |
| 298 | (* pre: if have declared a new metavar that hide another one, then |
| 299 | * must be passed with a binding that deleted this metavar |
| 300 | * |
| 301 | * Here we dont use the keep argument of julia. cf f(X,X), J'ai |
| 302 | * besoin de garder le X en interne, meme si julia s'en fout elle du |
| 303 | * X et qu'elle a mis X a DontSaved. |
| 304 | *) |
| 305 | let check_add_metavars_binding strip _keep inherited = fun (k, valu) tin -> |
| 306 | if inherited |
| 307 | then |
| 308 | match Common.optionise (fun () -> tin.binding0 +> List.assoc k) with |
| 309 | | Some (valu') -> |
| 310 | if Cocci_vs_c_3.equal_metavarval valu valu' |
| 311 | then Some tin.binding |
| 312 | else None |
| 313 | | None -> None |
| 314 | else |
| 315 | match Common.optionise (fun () -> tin.binding +> List.assoc k) with |
| 316 | | Some (valu') -> |
| 317 | if Cocci_vs_c_3.equal_metavarval valu valu' |
| 318 | then Some tin.binding |
| 319 | else None |
| 320 | |
| 321 | | None -> |
| 322 | let valu' = |
| 323 | match valu with |
| 324 | Ast_c.MetaIdVal a -> Ast_c.MetaIdVal a |
| 325 | | Ast_c.MetaFuncVal a -> Ast_c.MetaFuncVal a |
| 326 | | Ast_c.MetaLocalFuncVal a -> Ast_c.MetaLocalFuncVal a (*more?*) |
| 327 | | Ast_c.MetaExprVal a -> |
| 328 | Ast_c.MetaExprVal |
| 329 | (if strip |
| 330 | then Lib_parsing_c.al_expr a |
| 331 | else Lib_parsing_c.semi_al_expr a) |
| 332 | | Ast_c.MetaExprListVal a -> |
| 333 | Ast_c.MetaExprListVal |
| 334 | (if strip |
| 335 | then Lib_parsing_c.al_arguments a |
| 336 | else Lib_parsing_c.semi_al_arguments a) |
| 337 | |
| 338 | | Ast_c.MetaStmtVal a -> |
| 339 | Ast_c.MetaStmtVal |
| 340 | (if strip |
| 341 | then Lib_parsing_c.al_statement a |
| 342 | else Lib_parsing_c.semi_al_statement a) |
| 343 | | Ast_c.MetaTypeVal a -> |
| 344 | Ast_c.MetaTypeVal |
| 345 | (if strip |
| 346 | then Lib_parsing_c.al_type a |
| 347 | else Lib_parsing_c.semi_al_type a) |
| 348 | |
| 349 | | Ast_c.MetaListlenVal a -> Ast_c.MetaListlenVal a |
| 350 | |
| 351 | | Ast_c.MetaParamVal a -> failwith "not handling MetaParamVal" |
| 352 | | Ast_c.MetaParamListVal a -> |
| 353 | Ast_c.MetaParamListVal |
| 354 | (if strip |
| 355 | then Lib_parsing_c.al_params a |
| 356 | else Lib_parsing_c.semi_al_params a) |
| 357 | |
| 358 | | Ast_c.MetaPosVal (pos1,pos2) -> Ast_c.MetaPosVal (pos1,pos2) |
| 359 | | Ast_c.MetaPosValList l -> Ast_c.MetaPosValList l |
| 360 | in Some (tin.binding +> Common.insert_assoc (k, valu')) |
| 361 | |
| 362 | let envf keep inherited = fun (k, valu, get_max_min) f tin -> |
| 363 | let x = Ast_cocci.unwrap_mcode k in |
| 364 | match check_add_metavars_binding true keep inherited (x, valu) tin with |
| 365 | | Some binding -> |
| 366 | let new_tin = {tin with binding = binding} in |
| 367 | (match Ast_cocci.get_pos_var k with |
| 368 | Ast_cocci.MetaPos(name,constraints,per,keep,inherited) -> |
| 369 | let pvalu = |
| 370 | let (file,min,max) = get_max_min() in |
| 371 | Ast_c.MetaPosValList[(file,min,max)] in |
| 372 | (* check constraints. success means that there is a match with |
| 373 | one of the constraints, which will ultimately result in |
| 374 | failure. *) |
| 375 | check_pos_constraints constraints pvalu |
| 376 | (function () -> |
| 377 | (* constraints are satisfied, now see if we are compatible |
| 378 | with existing bindings *) |
| 379 | function new_tin -> |
| 380 | let x = Ast_cocci.unwrap_mcode name in |
| 381 | (match |
| 382 | check_add_metavars_binding false keep inherited (x, pvalu) |
| 383 | new_tin with |
| 384 | | Some binding -> |
| 385 | f () {new_tin with binding = binding} |
| 386 | | None -> fail tin)) |
| 387 | new_tin |
| 388 | | Ast_cocci.NoMetaPos -> f () new_tin) |
| 389 | | None -> fail tin |
| 390 | |
| 391 | (* ------------------------------------------------------------------------*) |
| 392 | (* Environment, allbounds *) |
| 393 | (* ------------------------------------------------------------------------*) |
| 394 | (* all referenced inherited variables have to be bound. This would |
| 395 | * be naturally checked for the minus or context ones in the |
| 396 | * matching process, but have to check the plus ones as well. The |
| 397 | * result of get_inherited contains all of these, but the potential |
| 398 | * redundant checking for the minus and context ones is probably not |
| 399 | * a big deal. If it's a problem, could fix free_vars to distinguish |
| 400 | * between + variables and the other ones. *) |
| 401 | |
| 402 | let (all_bound : Ast_cocci.meta_name list -> tin -> bool) = fun l tin -> |
| 403 | l +> List.for_all (fun inhvar -> |
| 404 | match Common.optionise (fun () -> tin.binding0 +> List.assoc inhvar) with |
| 405 | | Some _ -> true |
| 406 | | None -> false |
| 407 | ) |
| 408 | |
| 409 | let optional_storage_flag f = fun tin -> |
| 410 | f (tin.extra.optional_storage_iso) tin |
| 411 | |
| 412 | let optional_qualifier_flag f = fun tin -> |
| 413 | f (tin.extra.optional_qualifier_iso) tin |
| 414 | |
| 415 | let value_format_flag f = fun tin -> |
| 416 | f (tin.extra.value_format_iso) tin |
| 417 | |
| 418 | |
| 419 | (* ------------------------------------------------------------------------*) |
| 420 | (* Tokens *) |
| 421 | (* ------------------------------------------------------------------------*) |
| 422 | let tokenf ia ib = fun tin -> |
| 423 | let pos = Ast_c.info_to_fixpos ib in |
| 424 | let posmck = Ast_cocci.FixPos (pos, pos) in |
| 425 | let finish tin = tag_mck_pos_mcode ia posmck ib tin in |
| 426 | match Ast_cocci.get_pos_var ia with |
| 427 | Ast_cocci.MetaPos(name,constraints,per,keep,inherited) -> |
| 428 | let mpos = Lib_parsing_c.lin_col_by_pos [ib] in |
| 429 | let pvalu = Ast_c.MetaPosValList [mpos] in |
| 430 | check_pos_constraints constraints pvalu |
| 431 | (function () -> |
| 432 | (* constraints are satisfied, now see if we are compatible |
| 433 | with existing bindings *) |
| 434 | function new_tin -> |
| 435 | let x = Ast_cocci.unwrap_mcode name in |
| 436 | (match |
| 437 | check_add_metavars_binding false keep inherited (x, pvalu) tin |
| 438 | with |
| 439 | Some binding -> finish {tin with binding = binding} |
| 440 | | None -> fail tin)) |
| 441 | tin |
| 442 | | _ -> finish tin |
| 443 | |
| 444 | let tokenf_mck mck ib = fun tin -> |
| 445 | let pos = Ast_c.info_to_fixpos ib in |
| 446 | let posmck = Ast_cocci.FixPos (pos, pos) in |
| 447 | [(tag_mck_pos mck posmck, ib), tin.binding] |
| 448 | |
| 449 | end |
| 450 | |
| 451 | (*****************************************************************************) |
| 452 | (* Entry point *) |
| 453 | (*****************************************************************************) |
| 454 | module MATCH = Cocci_vs_c_3.COCCI_VS_C (XMATCH) |
| 455 | |
| 456 | |
| 457 | let match_re_node2 dropped_isos a b binding0 = |
| 458 | |
| 459 | let tin = { |
| 460 | XMATCH.extra = { |
| 461 | optional_storage_iso = not(List.mem "optional_storage" dropped_isos); |
| 462 | optional_qualifier_iso = not(List.mem "optional_qualifier" dropped_isos); |
| 463 | value_format_iso = not(List.mem "value_format" dropped_isos); |
| 464 | }; |
| 465 | XMATCH.binding = []; |
| 466 | XMATCH.binding0 = binding0; |
| 467 | } in |
| 468 | |
| 469 | MATCH.rule_elem_node a b tin |
| 470 | (* take only the tagged-SP, the 'a' *) |
| 471 | +> List.map (fun ((a,_b), binding) -> a, binding) |
| 472 | |
| 473 | |
| 474 | let match_re_node a b c d = |
| 475 | Common.profile_code "Pattern3.match_re_node" |
| 476 | (fun () -> match_re_node2 a b c d) |