| 1 | (* Yoann Padioleau |
| 2 | * |
| 3 | * Copyright (C) 2010, University of Copenhagen DIKU and INRIA. |
| 4 | * Copyright (C) 2006, 2007 Ecole des Mines de Nantes |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License (GPL) |
| 8 | * version 2 as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program 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 | * file license.txt for more details. |
| 14 | *) |
| 15 | open Common |
| 16 | |
| 17 | open Ast_c |
| 18 | open Control_flow_c |
| 19 | |
| 20 | open Ograph_extended |
| 21 | open Oassoc |
| 22 | open Oassocb |
| 23 | |
| 24 | module Lib = Lib_parsing_c |
| 25 | |
| 26 | (*****************************************************************************) |
| 27 | (* Wrappers *) |
| 28 | (*****************************************************************************) |
| 29 | let pr2, pr2_once = Common.mk_pr2_wrappers Flag_parsing_c.verbose_cfg |
| 30 | |
| 31 | (*****************************************************************************) |
| 32 | (* todo?: compute target level with goto (but rare that different I think) |
| 33 | * ver1: just do init, |
| 34 | * ver2: compute depth of label (easy, intercept compound in the visitor) |
| 35 | * |
| 36 | * checktodo: after a switch, need check that all the st in the |
| 37 | * compound start with a case: ? |
| 38 | * |
| 39 | * checktodo: how ensure that when we call aux_statement recursivly, we |
| 40 | * pass it xi_lbl and not just auxinfo ? how enforce that ? |
| 41 | * in fact we must either pass a xi_lbl or a newxi |
| 42 | * |
| 43 | * todo: can have code (and so nodes) in many places, in the size of an |
| 44 | * array, in the init of initializer, but also in StatementExpr, ... |
| 45 | * |
| 46 | * todo?: steal code from CIL ? (but seems complicated ... again) *) |
| 47 | (*****************************************************************************) |
| 48 | |
| 49 | (*****************************************************************************) |
| 50 | (* Types *) |
| 51 | (*****************************************************************************) |
| 52 | |
| 53 | type error = |
| 54 | | DeadCode of Common.parse_info option |
| 55 | | CaseNoSwitch of Common.parse_info |
| 56 | | OnlyBreakInSwitch of Common.parse_info |
| 57 | | WeirdSwitch of Common.parse_info |
| 58 | | NoEnclosingLoop of Common.parse_info |
| 59 | | GotoCantFindLabel of string * Common.parse_info |
| 60 | | NoExit of Common.parse_info |
| 61 | | DuplicatedLabel of string |
| 62 | | NestedFunc |
| 63 | | ComputedGoto |
| 64 | | Define of Common.parse_info |
| 65 | |
| 66 | exception Error of error |
| 67 | |
| 68 | (*****************************************************************************) |
| 69 | (* Helpers *) |
| 70 | (*****************************************************************************) |
| 71 | |
| 72 | let add_node node labels nodestr g = |
| 73 | g#add_node (Control_flow_c.mk_node node labels [] nodestr) |
| 74 | let add_bc_node node labels parent_labels nodestr g = |
| 75 | g#add_node (Control_flow_c.mk_node node labels parent_labels nodestr) |
| 76 | let add_arc_opt (starti, nodei) g = |
| 77 | starti +> do_option (fun starti -> g#add_arc ((starti, nodei), Direct)) |
| 78 | |
| 79 | |
| 80 | let lbl_0 = [] |
| 81 | |
| 82 | let pinfo_of_ii ii = Ast_c.get_opi (List.hd ii).Ast_c.pinfo |
| 83 | |
| 84 | |
| 85 | |
| 86 | (*****************************************************************************) |
| 87 | (* Contextual information passed in aux_statement *) |
| 88 | (*****************************************************************************) |
| 89 | |
| 90 | (* Sometimes have a continue/break and we must know where we must jump. |
| 91 | * |
| 92 | * ctl_brace: The node list in context_info record the number of '}' at the |
| 93 | * context point, for instance at the switch point. So that when deeper, |
| 94 | * we can compute the difference between the number of '}' from root to |
| 95 | * the context point to close the good number of '}' . For instance |
| 96 | * where there is a 'continue', we must close only until the for. |
| 97 | *) |
| 98 | type context_info = |
| 99 | | NoInfo |
| 100 | | LoopInfo of nodei * nodei (* start, end *) * node list * int list |
| 101 | | SwitchInfo of nodei * nodei (* start, end *) * node list * int list |
| 102 | |
| 103 | (* for the Compound case I need to do different things depending if |
| 104 | * the compound is the compound of the function definition, the compound of |
| 105 | * a switch, so this type allows to specify this and enable to factorize |
| 106 | * code for the Compound |
| 107 | *) |
| 108 | and compound_caller = |
| 109 | FunctionDef | Statement | Switch of (nodei -> xinfo -> xinfo) |
| 110 | |
| 111 | (* other information used internally in ast_to_flow and passed recursively *) |
| 112 | and xinfo = { |
| 113 | |
| 114 | ctx: context_info; (* cf above *) |
| 115 | ctx_stack: context_info list; |
| 116 | |
| 117 | (* are we under a ifthen[noelse]. Used for ErrorExit *) |
| 118 | under_ifthen: bool; |
| 119 | compound_caller: compound_caller; |
| 120 | |
| 121 | (* does not change recursively. Some kind of globals. *) |
| 122 | labels_assoc: (string, nodei) oassoc; |
| 123 | exiti: nodei option; |
| 124 | errorexiti: nodei option; |
| 125 | |
| 126 | (* ctl_braces: the nodei list is to handle current imbrication depth. |
| 127 | * It contains the must-close '}'. |
| 128 | * update: now it is instead a node list. |
| 129 | *) |
| 130 | braces: node list; |
| 131 | |
| 132 | (* ctl: *) |
| 133 | labels: int list; |
| 134 | } |
| 135 | |
| 136 | |
| 137 | let initial_info = { |
| 138 | ctx = NoInfo; |
| 139 | ctx_stack = []; |
| 140 | under_ifthen = false; |
| 141 | compound_caller = Statement; |
| 142 | braces = []; |
| 143 | labels = []; |
| 144 | |
| 145 | (* don't change when recurse *) |
| 146 | labels_assoc = new oassocb []; |
| 147 | exiti = None; |
| 148 | errorexiti = None; |
| 149 | } |
| 150 | |
| 151 | |
| 152 | (*****************************************************************************) |
| 153 | (* (Semi) Globals, Julia's style. *) |
| 154 | (*****************************************************************************) |
| 155 | (* global graph *) |
| 156 | let g = ref (new ograph_mutable) |
| 157 | |
| 158 | let counter_for_labels = ref 0 |
| 159 | let counter_for_braces = ref 0 |
| 160 | |
| 161 | (* For switch we use compteur too (or pass int ref) cos need know order of the |
| 162 | * case if then later want to go from CFG to (original) AST. |
| 163 | * update: obsolete now I think |
| 164 | *) |
| 165 | let counter_for_switch = ref 0 |
| 166 | |
| 167 | |
| 168 | (*****************************************************************************) |
| 169 | (* helpers *) |
| 170 | (*****************************************************************************) |
| 171 | |
| 172 | (* alt: do via a todo list, so can do all in one pass (but more complex) |
| 173 | * todo: can also count the depth level and associate it to the node, for |
| 174 | * the ctl_braces: |
| 175 | *) |
| 176 | let compute_labels_and_create_them st = |
| 177 | |
| 178 | (* map C label to index number in graph *) |
| 179 | let (h: (string, nodei) oassoc ref) = ref (new oassocb []) in |
| 180 | |
| 181 | begin |
| 182 | st +> Visitor_c.vk_statement { Visitor_c.default_visitor_c with |
| 183 | Visitor_c.kstatement = (fun (k, bigf) st -> |
| 184 | match Ast_c.unwrap_st st with |
| 185 | | Labeled (Ast_c.Label (name, _st)) -> |
| 186 | let ii = Ast_c.get_ii_st_take_care st in |
| 187 | (* at this point I put a lbl_0, but later I will put the |
| 188 | * good labels. *) |
| 189 | let s = Ast_c.str_of_name name in |
| 190 | let newi = !g +> add_node (Label (st,name, ((),ii))) lbl_0 (s^":") |
| 191 | in |
| 192 | begin |
| 193 | (* the C label already exists ? *) |
| 194 | if (!h#haskey s) then raise (Error (DuplicatedLabel s)); |
| 195 | h := !h#add (s, newi); |
| 196 | (* not k _st !!! otherwise in lbl1: lbl2: i++; we miss lbl2 *) |
| 197 | k st; |
| 198 | end |
| 199 | | _st -> k st |
| 200 | ) |
| 201 | }; |
| 202 | !h; |
| 203 | end |
| 204 | |
| 205 | |
| 206 | (* ctl_braces: *) |
| 207 | let insert_all_braces xs starti = |
| 208 | xs +> List.fold_left (fun acc node -> |
| 209 | (* Have to build a new node (clone), cos cant share it. |
| 210 | * update: This is now done by the caller. The clones are in xs. |
| 211 | *) |
| 212 | let newi = !g#add_node node in |
| 213 | !g#add_arc ((acc, newi), Direct); |
| 214 | newi |
| 215 | ) starti |
| 216 | |
| 217 | (*****************************************************************************) |
| 218 | (* Statement *) |
| 219 | (*****************************************************************************) |
| 220 | |
| 221 | (* Take in a (optional) start node, return an (optional) end node. |
| 222 | * |
| 223 | * history: |
| 224 | * |
| 225 | * ver1: old code was returning an nodei, but goto has no end, so |
| 226 | * aux_statement should return nodei option. |
| 227 | * |
| 228 | * ver2: old code was taking a nodei, but should also take nodei |
| 229 | * option. |
| 230 | * |
| 231 | * ver3: deadCode detection. What is dead code ? When there is no |
| 232 | * starti to start from ? So make starti an option too ? Si on arrive |
| 233 | * sur un label: au moment d'un deadCode, on peut verifier les |
| 234 | * predecesseurs de ce label, auquel cas si y'en a, ca veut dire |
| 235 | * qu'en fait c'est pas du deadCode et que donc on peut se permettre |
| 236 | * de partir d'un starti à None. Mais si on a xx; goto far:; near: |
| 237 | * yy; zz; far: goto near:. Bon ca doit etre un cas tres tres rare, |
| 238 | * mais a cause de notre parcours, on va rejeter ce programme car au |
| 239 | * moment d'arriver sur near: on n'a pas encore de predecesseurs pour |
| 240 | * ce label. De meme, meme le cas simple ou la derniere instruction |
| 241 | * c'est un return, alors ca va generer un DeadCode :( |
| 242 | * |
| 243 | * So make a first pass where dont launch exn at all. Create nodes, |
| 244 | * if starti is None then dont add arc. Then make a second pass that |
| 245 | * just checks that all nodes (except enter) have predecessors. |
| 246 | * So make starti an option too. So type is now |
| 247 | * |
| 248 | * nodei option -> statement -> nodei option. |
| 249 | * |
| 250 | * todo?: if the pb is at a fake node, then try first successos that |
| 251 | * is non fake. |
| 252 | * |
| 253 | * ver4: because of special needs of coccinelle, need pass more info, cf |
| 254 | * type additionnal_info defined above. |
| 255 | * |
| 256 | * - to complete (break, continue (and enclosing loop), switch (and |
| 257 | * associated case, casedefault)) we need to pass additionnal info. |
| 258 | * The start/exit when enter in a loop, to know the current 'for'. |
| 259 | * |
| 260 | * - to handle the braces, need again pass additionnal info. |
| 261 | * |
| 262 | * - need pass the labels. |
| 263 | * |
| 264 | * convention: xi for the auxinfo passed recursively |
| 265 | * |
| 266 | *) |
| 267 | |
| 268 | let rec (aux_statement: (nodei option * xinfo) -> statement -> nodei option) = |
| 269 | fun (starti, xi) stmt -> |
| 270 | |
| 271 | if not !Flag_parsing_c.label_strategy_2 |
| 272 | then incr counter_for_labels; |
| 273 | |
| 274 | let lbl = |
| 275 | if !Flag_parsing_c.label_strategy_2 |
| 276 | then xi.labels |
| 277 | else xi.labels @ [!counter_for_labels] |
| 278 | in |
| 279 | |
| 280 | (* Normally the new auxinfo to pass recursively to the next aux_statement. |
| 281 | * But in some cases we add additionnal stuff in which case we don't use |
| 282 | * this 'xi_lbl' but a 'newxi' specially built. |
| 283 | *) |
| 284 | let xi_lbl = |
| 285 | if !Flag_parsing_c.label_strategy_2 |
| 286 | then { xi with |
| 287 | compound_caller = Statement; |
| 288 | } |
| 289 | else { xi with |
| 290 | labels = xi.labels @ [ !counter_for_labels ]; |
| 291 | compound_caller = Statement; |
| 292 | } |
| 293 | in |
| 294 | let ii = Ast_c.get_ii_st_take_care stmt in |
| 295 | |
| 296 | (* ------------------------- *) |
| 297 | match Ast_c.unwrap_st stmt with |
| 298 | |
| 299 | (* coupling: the Switch case copy paste parts of the Compound case *) |
| 300 | | Ast_c.Compound statxs -> |
| 301 | (* flow_to_ast: *) |
| 302 | let (i1, i2) = tuple_of_list2 ii in |
| 303 | |
| 304 | (* ctl_braces: *) |
| 305 | incr counter_for_braces; |
| 306 | let brace = !counter_for_braces in |
| 307 | |
| 308 | let s1 = "{" ^ i_to_s brace in |
| 309 | let s2 = "}" ^ i_to_s brace in |
| 310 | |
| 311 | let lbl = match xi.compound_caller with |
| 312 | | FunctionDef -> xi.labels (* share label with function header *) |
| 313 | | Statement -> xi.labels @ [!counter_for_labels] |
| 314 | | Switch _ -> xi.labels |
| 315 | in |
| 316 | |
| 317 | let newi = !g +> add_node (SeqStart (stmt, brace, i1)) lbl s1 in |
| 318 | let endnode = mk_node (SeqEnd (brace, i2)) lbl [] s2 in |
| 319 | let endnode_dup = mk_fake_node (SeqEnd (brace, i2)) lbl [] s2 in |
| 320 | (* |
| 321 | let _endnode_dup = |
| 322 | mk_node (SeqEnd (brace, Ast_c.fakeInfo())) lbl [] s2 in |
| 323 | *) |
| 324 | |
| 325 | let newxi = { xi_lbl with braces = endnode_dup:: xi_lbl.braces } in |
| 326 | |
| 327 | let newxi = match xi.compound_caller with |
| 328 | | Switch todo_in_compound -> |
| 329 | (* note that side effect in todo_in_compound *) |
| 330 | todo_in_compound newi newxi |
| 331 | | FunctionDef | Statement -> newxi |
| 332 | in |
| 333 | |
| 334 | !g +> add_arc_opt (starti, newi); |
| 335 | let finishi = Some newi in |
| 336 | |
| 337 | aux_statement_list finishi (xi, newxi) statxs |
| 338 | |
| 339 | (* braces: *) |
| 340 | +> Common.fmap (fun finishi -> |
| 341 | (* subtil: not always return a Some. |
| 342 | * Note that if finishi is None, alors forcement ca veut dire |
| 343 | * qu'il y'a eu un return (ou goto), et donc forcement les |
| 344 | * braces auront au moins ete crée une fois, et donc flow_to_ast |
| 345 | * marchera. |
| 346 | * Sauf si le goto revient en arriere ? mais dans ce cas |
| 347 | * ca veut dire que le programme boucle. Pour qu'il boucle pas |
| 348 | * il faut forcement au moins un return. |
| 349 | *) |
| 350 | let endi = !g#add_node endnode in |
| 351 | if xi.compound_caller = Statement |
| 352 | then |
| 353 | (* Problem! This edge is only created if the block does not |
| 354 | have return on all execution paths. *) |
| 355 | (let afteri = !g +> add_node AfterNode lbl "[after]" in |
| 356 | !g#add_arc ((newi, afteri), Direct); |
| 357 | !g#add_arc ((afteri, endi), Direct)); |
| 358 | !g#add_arc ((finishi, endi), Direct); |
| 359 | endi |
| 360 | ) |
| 361 | |
| 362 | |
| 363 | (* ------------------------- *) |
| 364 | | Labeled (Ast_c.Label (name, st)) -> |
| 365 | let s = Ast_c.str_of_name name in |
| 366 | let ilabel = xi.labels_assoc#find s in |
| 367 | let node = mk_node (unwrap (!g#nodes#find ilabel)) lbl [] (s ^ ":") in |
| 368 | !g#replace_node (ilabel, node); |
| 369 | !g +> add_arc_opt (starti, ilabel); |
| 370 | aux_statement (Some ilabel, xi_lbl) st |
| 371 | |
| 372 | |
| 373 | | Jump (Ast_c.Goto name) -> |
| 374 | let s = Ast_c.str_of_name name in |
| 375 | (* special_cfg_ast: *) |
| 376 | let newi = !g +> add_node (Goto (stmt, name, ((),ii))) lbl ("goto "^s^":") |
| 377 | in |
| 378 | !g +> add_arc_opt (starti, newi); |
| 379 | |
| 380 | if !Flag_parsing_c.no_gotos |
| 381 | then Some newi |
| 382 | else |
| 383 | begin |
| 384 | let ilabel = |
| 385 | try xi.labels_assoc#find s |
| 386 | with Not_found -> |
| 387 | (* jump vers ErrorExit a la place ? |
| 388 | * pourquoi tant de "cant jump" ? pas detecté par gcc ? |
| 389 | *) |
| 390 | raise (Error (GotoCantFindLabel (s, pinfo_of_ii ii))) |
| 391 | in |
| 392 | (* !g +> add_arc_opt (starti, ilabel); |
| 393 | * todo: special_case: suppose that always goto to toplevel of |
| 394 | * function, hence the Common.init |
| 395 | * todo?: can perhaps report when a goto is not a classic error_goto ? |
| 396 | * that is when it does not jump to the toplevel of the function. |
| 397 | *) |
| 398 | let newi = insert_all_braces (Common.list_init xi.braces) newi in |
| 399 | !g#add_arc ((newi, ilabel), Direct); |
| 400 | None |
| 401 | end |
| 402 | |
| 403 | | Jump (Ast_c.GotoComputed e) -> |
| 404 | raise (Error (ComputedGoto)) |
| 405 | |
| 406 | (* ------------------------- *) |
| 407 | | Ast_c.ExprStatement opte -> |
| 408 | (* flow_to_ast: old: when opte = None, then do not add in CFG. *) |
| 409 | let s = |
| 410 | match opte with |
| 411 | | None -> "empty;" |
| 412 | | Some e -> |
| 413 | (match Ast_c.unwrap_expr e with |
| 414 | | FunCall (e, _args) -> |
| 415 | (match Ast_c.unwrap_expr e with |
| 416 | | Ident namef -> |
| 417 | Ast_c.str_of_name namef ^ "(...)" |
| 418 | | _ -> "statement" |
| 419 | ) |
| 420 | | Assignment (e1, SimpleAssign, e2) -> |
| 421 | (match Ast_c.unwrap_expr e1 with |
| 422 | | Ident namevar -> |
| 423 | Ast_c.str_of_name namevar ^ " = ... ;" |
| 424 | | RecordAccess(e, field) -> |
| 425 | (match Ast_c.unwrap_expr e with |
| 426 | | Ident namevar -> |
| 427 | let sfield = Ast_c.str_of_name field in |
| 428 | Ast_c.str_of_name namevar ^ "." ^ sfield ^ " = ... ;" |
| 429 | | _ -> "statement" |
| 430 | ) |
| 431 | | _ -> "statement" |
| 432 | ) |
| 433 | | _ -> "statement" |
| 434 | ) |
| 435 | in |
| 436 | let newi = !g +> add_node (ExprStatement (stmt, (opte, ii))) lbl s in |
| 437 | !g +> add_arc_opt (starti, newi); |
| 438 | Some newi |
| 439 | |
| 440 | |
| 441 | (* ------------------------- *) |
| 442 | | Selection (Ast_c.If (e, st1, st2)) -> |
| 443 | |
| 444 | let iist2 = Ast_c.get_ii_st_take_care st2 in |
| 445 | (match Ast_c.unwrap_st st2 with |
| 446 | | Ast_c.ExprStatement (None) when null iist2 -> |
| 447 | (* sometime can have ExprStatement None but it is a if-then-else, |
| 448 | * because something like if() xx else ; |
| 449 | * so must force to have [] in the ii associated with ExprStatement |
| 450 | *) |
| 451 | |
| 452 | let (i1,i2,i3, iifakeend) = tuple_of_list4 ii in |
| 453 | let ii = [i1;i2;i3] in |
| 454 | (* starti -> newi ---> newfakethen -> ... -> finalthen --> lasti |
| 455 | * | | |
| 456 | * |-> newfakeelse -> ... -> finalelse -| |
| 457 | * update: there is now also a link directly to lasti. |
| 458 | * |
| 459 | * because of CTL, now do different things if we are in a ifthen or |
| 460 | * ifthenelse. |
| 461 | *) |
| 462 | let newi = !g +> add_node (IfHeader (stmt, (e, ii))) lbl ("if") in |
| 463 | !g +> add_arc_opt (starti, newi); |
| 464 | let newfakethen = !g +> add_node TrueNode lbl "[then]" in |
| 465 | let newfakeelse = !g +> add_node FallThroughNode lbl "[fallthrough]" in |
| 466 | let afteri = !g +> add_node AfterNode lbl "[after]" in |
| 467 | let lasti = !g +> add_node (EndStatement (Some iifakeend)) lbl "[endif]" |
| 468 | in |
| 469 | |
| 470 | (* for ErrorExit heuristic *) |
| 471 | let newxi = { xi_lbl with under_ifthen = true; } in |
| 472 | |
| 473 | !g#add_arc ((newi, newfakethen), Direct); |
| 474 | !g#add_arc ((newi, newfakeelse), Direct); |
| 475 | !g#add_arc ((newi, afteri), Direct); |
| 476 | !g#add_arc ((afteri, lasti), Direct); |
| 477 | !g#add_arc ((newfakeelse, lasti), Direct); |
| 478 | |
| 479 | let finalthen = aux_statement (Some newfakethen, newxi) st1 in |
| 480 | !g +> add_arc_opt (finalthen, lasti); |
| 481 | Some lasti |
| 482 | |
| 483 | | _unwrap_st2 -> |
| 484 | (* starti -> newi ---> newfakethen -> ... -> finalthen --> lasti |
| 485 | * | | |
| 486 | * |-> newfakeelse -> ... -> finalelse -| |
| 487 | * update: there is now also a link directly to lasti. |
| 488 | *) |
| 489 | let (iiheader, iielse, iifakeend) = |
| 490 | match ii with |
| 491 | | [i1;i2;i3;i4;i5] -> [i1;i2;i3], i4, i5 |
| 492 | | _ -> raise (Impossible 62) |
| 493 | in |
| 494 | let newi = !g +> add_node (IfHeader (stmt, (e, iiheader))) lbl "if" in |
| 495 | !g +> add_arc_opt (starti, newi); |
| 496 | let newfakethen = !g +> add_node TrueNode lbl "[then]" in |
| 497 | let newfakeelse = !g +> add_node FalseNode lbl "[else]" in |
| 498 | let elsenode = !g +> add_node (Else iielse) lbl "else" in |
| 499 | |
| 500 | |
| 501 | !g#add_arc ((newi, newfakethen), Direct); |
| 502 | !g#add_arc ((newi, newfakeelse), Direct); |
| 503 | |
| 504 | !g#add_arc ((newfakeelse, elsenode), Direct); |
| 505 | |
| 506 | let finalthen = aux_statement (Some newfakethen, xi_lbl) st1 in |
| 507 | let finalelse = aux_statement (Some elsenode, xi_lbl) st2 in |
| 508 | |
| 509 | (match finalthen, finalelse with |
| 510 | | (None, None) -> None |
| 511 | | _ -> |
| 512 | let lasti = |
| 513 | !g +> add_node (EndStatement(Some iifakeend)) lbl "[endif]" in |
| 514 | let afteri = |
| 515 | !g +> add_node AfterNode lbl "[after]" in |
| 516 | !g#add_arc ((newi, afteri), Direct); |
| 517 | !g#add_arc ((afteri, lasti), Direct); |
| 518 | begin |
| 519 | !g +> add_arc_opt (finalthen, lasti); |
| 520 | !g +> add_arc_opt (finalelse, lasti); |
| 521 | Some lasti |
| 522 | end) |
| 523 | ) |
| 524 | |
| 525 | (* ------------------------- *) |
| 526 | | Selection (Ast_c.Switch (e, st)) -> |
| 527 | let (i1,i2,i3, iifakeend) = tuple_of_list4 ii in |
| 528 | |
| 529 | let ii = [i1;i2;i3] in |
| 530 | |
| 531 | (* The newswitchi is for the labels to know where to attach. |
| 532 | * The newendswitch (endi) is for the 'break'. *) |
| 533 | let newswitchi= |
| 534 | !g +> add_node (SwitchHeader(stmt,(e,ii))) lbl "switch" in |
| 535 | let newendswitch = |
| 536 | !g +> add_node (EndStatement (Some iifakeend)) lbl "[endswitch]" in |
| 537 | |
| 538 | !g +> add_arc_opt (starti, newswitchi); |
| 539 | |
| 540 | (* call compound case. Need special info to pass to compound case |
| 541 | * because we need to build a context_info that need some of the |
| 542 | * information build inside the compound case: the nodei of { |
| 543 | *) |
| 544 | let finalthen = |
| 545 | match Ast_c.unwrap_st st with |
| 546 | | Ast_c.Compound statxs -> |
| 547 | |
| 548 | let statxs = Lib.stmt_elems_of_sequencable statxs in |
| 549 | |
| 550 | (* todo? we should not allow to match a stmt that corresponds |
| 551 | * to a compound of a switch, so really SeqStart (stmt, ...) |
| 552 | * here ? so maybe should change the SeqStart labeling too. |
| 553 | * So need pass a todo_in_compound2 function. |
| 554 | *) |
| 555 | let todo_in_compound newi newxi = |
| 556 | let newxi' = { newxi with |
| 557 | ctx = SwitchInfo (newi(*!!*), newendswitch, xi.braces, lbl); |
| 558 | ctx_stack = newxi.ctx::newxi.ctx_stack |
| 559 | } |
| 560 | in |
| 561 | !g#add_arc ((newswitchi, newi), Direct); |
| 562 | (* new: if have not a default case, then must add an edge |
| 563 | * between start to end. |
| 564 | * todo? except if the case[range] coverthe whole spectrum |
| 565 | *) |
| 566 | if not (statxs +> List.exists (fun x -> |
| 567 | match Ast_c.unwrap_st x with |
| 568 | | Labeled (Ast_c.Default _) -> true |
| 569 | | _ -> false |
| 570 | )) |
| 571 | then begin |
| 572 | (* when there is no default, then a valid path is |
| 573 | * from the switchheader to the end. In between we |
| 574 | * add a Fallthrough. |
| 575 | *) |
| 576 | |
| 577 | let newafter = !g+>add_node FallThroughNode lbl "[switchfall]" |
| 578 | in |
| 579 | !g#add_arc ((newafter, newendswitch), Direct); |
| 580 | !g#add_arc ((newswitchi, newafter), Direct); |
| 581 | (* old: |
| 582 | !g#add_arc ((newswitchi, newendswitch), Direct) +> adjust_g; |
| 583 | *) |
| 584 | end; |
| 585 | newxi' |
| 586 | in |
| 587 | let newxi = { xi_lbl with compound_caller = (* was xi *) |
| 588 | Switch todo_in_compound |
| 589 | } |
| 590 | in |
| 591 | aux_statement (None (* no starti *), newxi) st |
| 592 | | _x -> |
| 593 | (* apparently gcc allows some switch body such as |
| 594 | * switch (i) case 0 : printf("here\n"); |
| 595 | * cf tests-bis/switch_no_body.c |
| 596 | * but I don't think it's worthwile to handle |
| 597 | * such pathological and rare case. Not worth |
| 598 | * the complexity. Safe to assume a coumpound. |
| 599 | *) |
| 600 | raise (Error (WeirdSwitch (pinfo_of_ii [i1]))) |
| 601 | in |
| 602 | !g +> add_arc_opt (finalthen, newendswitch); |
| 603 | |
| 604 | |
| 605 | (* what if has only returns inside. We must try to see if the |
| 606 | * newendswitch has been used via a 'break;' or because no |
| 607 | * 'default:') |
| 608 | *) |
| 609 | let res = |
| 610 | (match finalthen with |
| 611 | | Some finalthen -> |
| 612 | |
| 613 | let afteri = !g +> add_node AfterNode lbl "[after]" in |
| 614 | !g#add_arc ((newswitchi, afteri), Direct); |
| 615 | !g#add_arc ((afteri, newendswitch), Direct); |
| 616 | |
| 617 | |
| 618 | !g#add_arc ((finalthen, newendswitch), Direct); |
| 619 | Some newendswitch |
| 620 | | None -> |
| 621 | if (!g#predecessors newendswitch)#null |
| 622 | then begin |
| 623 | assert ((!g#successors newendswitch)#null); |
| 624 | !g#del_node newendswitch; |
| 625 | None |
| 626 | end |
| 627 | else begin |
| 628 | |
| 629 | let afteri = !g +> add_node AfterNode lbl "[after]" in |
| 630 | !g#add_arc ((newswitchi, afteri), Direct); |
| 631 | !g#add_arc ((afteri, newendswitch), Direct); |
| 632 | |
| 633 | |
| 634 | Some newendswitch |
| 635 | end |
| 636 | ) |
| 637 | in |
| 638 | res |
| 639 | |
| 640 | |
| 641 | | Labeled (Ast_c.Case (_, _)) |
| 642 | | Labeled (Ast_c.CaseRange (_, _, _)) -> |
| 643 | |
| 644 | incr counter_for_switch; |
| 645 | let switchrank = !counter_for_switch in |
| 646 | let node, st = |
| 647 | match Ast_c.get_st_and_ii stmt with |
| 648 | | Labeled (Ast_c.Case (e, st)), ii -> |
| 649 | (Case (stmt, (e, ii))), st |
| 650 | | Labeled (Ast_c.CaseRange (e, e2, st)), ii -> |
| 651 | (CaseRange (stmt, ((e, e2), ii))), st |
| 652 | | _ -> raise (Impossible 63) |
| 653 | in |
| 654 | |
| 655 | let newi = !g +> add_node node lbl "case:" in |
| 656 | |
| 657 | (match Common.optionise (fun () -> |
| 658 | (* old: xi.ctx *) |
| 659 | (xi.ctx::xi.ctx_stack) +> Common.find_some (function |
| 660 | | SwitchInfo (a, b, c, _) -> Some (a, b, c) |
| 661 | | _ -> None |
| 662 | )) |
| 663 | with |
| 664 | | Some (startbrace, switchendi, _braces) -> |
| 665 | (* no need to attach to previous for the first case, cos would be |
| 666 | * redundant. *) |
| 667 | starti +> do_option (fun starti -> |
| 668 | if starti <> startbrace |
| 669 | then !g +> add_arc_opt (Some starti, newi); |
| 670 | ); |
| 671 | |
| 672 | let s = ("[casenode] " ^ i_to_s switchrank) in |
| 673 | let newcasenodei = !g +> add_node (CaseNode switchrank) lbl s in |
| 674 | !g#add_arc ((startbrace, newcasenodei), Direct); |
| 675 | !g#add_arc ((newcasenodei, newi), Direct); |
| 676 | | None -> raise (Error (CaseNoSwitch (pinfo_of_ii ii))) |
| 677 | ); |
| 678 | aux_statement (Some newi, xi_lbl) st |
| 679 | |
| 680 | |
| 681 | | Labeled (Ast_c.Default st) -> |
| 682 | incr counter_for_switch; |
| 683 | let switchrank = !counter_for_switch in |
| 684 | |
| 685 | let newi = !g +> add_node (Default(stmt, ((),ii))) lbl "case default:" in |
| 686 | !g +> add_arc_opt (starti, newi); |
| 687 | |
| 688 | (match xi.ctx with |
| 689 | | SwitchInfo (startbrace, switchendi, _braces, _parent_lbl) -> |
| 690 | let s = ("[casenode] " ^ i_to_s switchrank) in |
| 691 | let newcasenodei = !g +> add_node (CaseNode switchrank) lbl s in |
| 692 | !g#add_arc ((startbrace, newcasenodei), Direct); |
| 693 | !g#add_arc ((newcasenodei, newi), Direct); |
| 694 | | _ -> raise (Error (CaseNoSwitch (pinfo_of_ii ii))) |
| 695 | ); |
| 696 | aux_statement (Some newi, xi_lbl) st |
| 697 | |
| 698 | |
| 699 | |
| 700 | |
| 701 | |
| 702 | |
| 703 | (* ------------------------- *) |
| 704 | | Iteration (Ast_c.While (e, st)) -> |
| 705 | (* starti -> newi ---> newfakethen -> ... -> finalthen - |
| 706 | * |---|-----------------------------------| |
| 707 | * |-> newfakelse |
| 708 | *) |
| 709 | |
| 710 | let (i1,i2,i3, iifakeend) = tuple_of_list4 ii in |
| 711 | let ii = [i1;i2;i3] in |
| 712 | |
| 713 | let newi = !g +> add_node (WhileHeader (stmt, (e,ii))) lbl "while" in |
| 714 | !g +> add_arc_opt (starti, newi); |
| 715 | let newfakethen = !g +> add_node InLoopNode lbl "[whiletrue]" in |
| 716 | (* let newfakeelse = !g +> add_node FalseNode lbl "[endwhile]" in *) |
| 717 | let newafter = !g +> add_node LoopFallThroughNode lbl "[whilefall]" in |
| 718 | let newfakeelse = |
| 719 | !g +> add_node (EndStatement (Some iifakeend)) lbl "[endwhile]" in |
| 720 | |
| 721 | let newxi = { xi_lbl with |
| 722 | ctx = LoopInfo (newi, newfakeelse, xi_lbl.braces, lbl); |
| 723 | ctx_stack = xi_lbl.ctx::xi_lbl.ctx_stack |
| 724 | } |
| 725 | in |
| 726 | |
| 727 | !g#add_arc ((newi, newfakethen), Direct); |
| 728 | !g#add_arc ((newafter, newfakeelse), Direct); |
| 729 | !g#add_arc ((newi, newafter), Direct); |
| 730 | let finalthen = aux_statement (Some newfakethen, newxi) st in |
| 731 | !g +> add_arc_opt |
| 732 | (finalthen, if !Flag_parsing_c.no_loops then newafter else newi); |
| 733 | Some newfakeelse |
| 734 | |
| 735 | |
| 736 | (* This time, may return None, for instance if goto in body of dowhile |
| 737 | * (whereas While cant return None). But if return None, certainly |
| 738 | * some deadcode. |
| 739 | *) |
| 740 | | Iteration (Ast_c.DoWhile (st, e)) -> |
| 741 | (* starti -> doi ---> ... ---> finalthen (opt) ---> whiletaili |
| 742 | * |--------- newfakethen ---------------| |---> newfakelse |
| 743 | *) |
| 744 | let is_zero = |
| 745 | match Ast_c.unwrap_expr e with |
| 746 | | Constant (Int ("0",_)) -> true |
| 747 | | _ -> false |
| 748 | in |
| 749 | |
| 750 | let (iido, iiwhiletail, iifakeend) = |
| 751 | match ii with |
| 752 | | [i1;i2;i3;i4;i5;i6] -> i1, [i2;i3;i4;i5], i6 |
| 753 | | _ -> raise (Impossible 64) |
| 754 | in |
| 755 | let doi = !g +> add_node (DoHeader (stmt, iido)) lbl "do" in |
| 756 | !g +> add_arc_opt (starti, doi); |
| 757 | let taili = !g +> add_node (DoWhileTail (e, iiwhiletail)) lbl "whiletail" |
| 758 | in |
| 759 | |
| 760 | |
| 761 | (*let newfakeelse = !g +> add_node FalseNode lbl "[enddowhile]" in *) |
| 762 | let newafter = !g +> add_node FallThroughNode lbl "[dowhilefall]" in |
| 763 | let newfakeelse = |
| 764 | !g +> add_node (EndStatement (Some iifakeend)) lbl "[enddowhile]" in |
| 765 | |
| 766 | let afteri = !g +> add_node AfterNode lbl "[after]" in |
| 767 | !g#add_arc ((doi,afteri), Direct); |
| 768 | !g#add_arc ((afteri,newfakeelse), Direct); |
| 769 | |
| 770 | let newxi = { xi_lbl with |
| 771 | ctx = LoopInfo (taili, newfakeelse, xi_lbl.braces, lbl); |
| 772 | ctx_stack = xi_lbl.ctx::xi_lbl.ctx_stack |
| 773 | } |
| 774 | in |
| 775 | |
| 776 | if not is_zero && (not !Flag_parsing_c.no_loops) |
| 777 | then begin |
| 778 | let newfakethen = !g +> add_node InLoopNode lbl "[dowhiletrue]" in |
| 779 | !g#add_arc ((taili, newfakethen), Direct); |
| 780 | !g#add_arc ((newfakethen, doi), Direct); |
| 781 | end; |
| 782 | |
| 783 | !g#add_arc ((newafter, newfakeelse), Direct); |
| 784 | !g#add_arc ((taili, newafter), Direct); |
| 785 | |
| 786 | |
| 787 | let finalthen = aux_statement (Some doi, newxi) st in |
| 788 | (match finalthen with |
| 789 | | None -> |
| 790 | if (!g#predecessors taili)#null |
| 791 | then raise (Error (DeadCode (Some (pinfo_of_ii ii)))) |
| 792 | else Some newfakeelse |
| 793 | | Some finali -> |
| 794 | !g#add_arc ((finali, taili), Direct); |
| 795 | Some newfakeelse |
| 796 | ) |
| 797 | |
| 798 | |
| 799 | |
| 800 | | Iteration (Ast_c.For (e1opt, e2opt, e3opt, st)) -> |
| 801 | let (i1,i2,i3, iifakeend) = tuple_of_list4 ii in |
| 802 | let ii = [i1;i2;i3] in |
| 803 | |
| 804 | let newi = |
| 805 | !g+>add_node(ForHeader(stmt,((e1opt,e2opt,e3opt),ii))) lbl "for" in |
| 806 | !g +> add_arc_opt (starti, newi); |
| 807 | let newfakethen = !g +> add_node InLoopNode lbl "[fortrue]" in |
| 808 | (*let newfakeelse = !g +> add_node FalseNode lbl "[endfor]" in*) |
| 809 | let newafter = !g +> add_node LoopFallThroughNode lbl "[forfall]" in |
| 810 | let newfakeelse = |
| 811 | !g +> add_node (EndStatement (Some iifakeend)) lbl "[endfor]" in |
| 812 | |
| 813 | let newxi = { xi_lbl with |
| 814 | ctx = LoopInfo (newi, newfakeelse, xi_lbl.braces, lbl); |
| 815 | ctx_stack = xi_lbl.ctx::xi_lbl.ctx_stack |
| 816 | } |
| 817 | in |
| 818 | |
| 819 | !g#add_arc ((newi, newfakethen), Direct); |
| 820 | !g#add_arc ((newafter, newfakeelse), Direct); |
| 821 | !g#add_arc ((newi, newafter), Direct); |
| 822 | let finalthen = aux_statement (Some newfakethen, newxi) st in |
| 823 | !g +> add_arc_opt |
| 824 | (finalthen, |
| 825 | if !Flag_parsing_c.no_loops then newafter else newi); |
| 826 | Some newfakeelse |
| 827 | |
| 828 | |
| 829 | (* to generate less exception with the breakInsideLoop, analyse |
| 830 | * correctly the loop deguisé comme list_for_each. Add a case ForMacro |
| 831 | * in ast_c (and in lexer/parser), and then do code that imitates the |
| 832 | * code for the For. |
| 833 | * update: the list_for_each was previously converted into Tif by the |
| 834 | * lexer, now they are returned as Twhile so less pbs. But not perfect. |
| 835 | * update: now I recognize the list_for_each macro so no more problems. |
| 836 | *) |
| 837 | | Iteration (Ast_c.MacroIteration (s, es, st)) -> |
| 838 | let (i1,i2,i3, iifakeend) = tuple_of_list4 ii in |
| 839 | let ii = [i1;i2;i3] in |
| 840 | |
| 841 | let newi = |
| 842 | !g+>add_node(MacroIterHeader(stmt,((s,es),ii))) lbl "foreach" in |
| 843 | !g +> add_arc_opt (starti, newi); |
| 844 | let newfakethen = !g +> add_node InLoopNode lbl "[fortrue]" in |
| 845 | (*let newfakeelse = !g +> add_node FalseNode lbl "[endfor]" in*) |
| 846 | let newafter = !g +> add_node LoopFallThroughNode lbl "[foreachfall]" in |
| 847 | let newfakeelse = |
| 848 | !g +> add_node (EndStatement (Some iifakeend)) lbl "[endforeach]" in |
| 849 | |
| 850 | let newxi = { xi_lbl with |
| 851 | ctx = LoopInfo (newi, newfakeelse, xi_lbl.braces, lbl); |
| 852 | ctx_stack = xi_lbl.ctx::xi_lbl.ctx_stack |
| 853 | } |
| 854 | in |
| 855 | |
| 856 | !g#add_arc ((newi, newfakethen), Direct); |
| 857 | !g#add_arc ((newafter, newfakeelse), Direct); |
| 858 | !g#add_arc ((newi, newafter), Direct); |
| 859 | let finalthen = aux_statement (Some newfakethen, newxi) st in |
| 860 | !g +> add_arc_opt |
| 861 | (finalthen, |
| 862 | if !Flag_parsing_c.no_loops then newafter else newi); |
| 863 | Some newfakeelse |
| 864 | |
| 865 | |
| 866 | |
| 867 | (* ------------------------- *) |
| 868 | | Jump ((Ast_c.Continue|Ast_c.Break) as x) -> |
| 869 | let context_info = |
| 870 | match xi.ctx with |
| 871 | SwitchInfo (startbrace, loopendi, braces, parent_lbl) -> |
| 872 | if x =*= Ast_c.Break |
| 873 | then xi.ctx |
| 874 | else |
| 875 | (try |
| 876 | xi.ctx_stack +> Common.find_some (function |
| 877 | LoopInfo (_,_,_,_) as c -> Some c |
| 878 | | _ -> None) |
| 879 | with Not_found -> |
| 880 | raise (Error (OnlyBreakInSwitch (pinfo_of_ii ii)))) |
| 881 | | LoopInfo (loopstarti, loopendi, braces, parent_lbl) -> xi.ctx |
| 882 | | NoInfo -> raise (Error (NoEnclosingLoop (pinfo_of_ii ii))) in |
| 883 | |
| 884 | let parent_label = |
| 885 | match context_info with |
| 886 | LoopInfo (loopstarti, loopendi, braces, parent_lbl) -> parent_lbl |
| 887 | | SwitchInfo (startbrace, loopendi, braces, parent_lbl) -> parent_lbl |
| 888 | | NoInfo -> raise (Impossible 65) in |
| 889 | |
| 890 | (* flow_to_ast: *) |
| 891 | let (node_info, string) = |
| 892 | let parent_string = |
| 893 | String.concat "," (List.map string_of_int parent_label) in |
| 894 | (match x with |
| 895 | | Ast_c.Continue -> |
| 896 | (Continue (stmt, ((), ii)), |
| 897 | Printf.sprintf "continue; [%s]" parent_string) |
| 898 | | Ast_c.Break -> |
| 899 | (Break (stmt, ((), ii)), |
| 900 | Printf.sprintf "break; [%s]" parent_string) |
| 901 | | _ -> raise (Impossible 66) |
| 902 | ) in |
| 903 | |
| 904 | (* idea: break or continue records the label of its parent loop or |
| 905 | switch *) |
| 906 | let newi = !g +> add_bc_node node_info lbl parent_label string in |
| 907 | !g +> add_arc_opt (starti, newi); |
| 908 | |
| 909 | (* let newi = some starti in *) |
| 910 | |
| 911 | (match context_info with |
| 912 | | LoopInfo (loopstarti, loopendi, braces, parent_lbl) -> |
| 913 | let desti = |
| 914 | (match x with |
| 915 | | Ast_c.Break -> loopendi |
| 916 | | Ast_c.Continue -> |
| 917 | (* if no loops, then continue behaves like break - just |
| 918 | one iteration *) |
| 919 | if !Flag_parsing_c.no_loops then loopendi else loopstarti |
| 920 | | x -> raise (Impossible 67) |
| 921 | ) in |
| 922 | let difference = List.length xi.braces - List.length braces in |
| 923 | assert (difference >= 0); |
| 924 | let toend = take difference xi.braces in |
| 925 | let newi = insert_all_braces toend newi in |
| 926 | !g#add_arc ((newi, desti), Direct); |
| 927 | None |
| 928 | |
| 929 | | SwitchInfo (startbrace, loopendi, braces, parent_lbl) -> |
| 930 | assert (x =*= Ast_c.Break); |
| 931 | let difference = List.length xi.braces - List.length braces in |
| 932 | assert (difference >= 0); |
| 933 | let toend = take difference xi.braces in |
| 934 | let newi = insert_all_braces toend newi in |
| 935 | !g#add_arc ((newi, loopendi), Direct); |
| 936 | None |
| 937 | | NoInfo -> raise (Impossible 68) |
| 938 | ) |
| 939 | |
| 940 | | Jump ((Ast_c.Return | Ast_c.ReturnExpr _) as kind) -> |
| 941 | (match xi.exiti, xi.errorexiti with |
| 942 | | None, None -> raise (Error (NoExit (pinfo_of_ii ii))) |
| 943 | | Some exiti, Some errorexiti -> |
| 944 | |
| 945 | (* flow_to_ast: *) |
| 946 | let s = |
| 947 | match kind with |
| 948 | | Ast_c.Return -> "return" |
| 949 | | Ast_c.ReturnExpr _ -> "return ..." |
| 950 | | _ -> raise (Impossible 69) |
| 951 | in |
| 952 | let newi = |
| 953 | !g +> add_node |
| 954 | (match kind with |
| 955 | | Ast_c.Return -> Return (stmt, ((),ii)) |
| 956 | | Ast_c.ReturnExpr e -> ReturnExpr (stmt, (e, ii)) |
| 957 | | _ -> raise (Impossible 70) |
| 958 | ) |
| 959 | lbl s |
| 960 | in |
| 961 | !g +> add_arc_opt (starti, newi); |
| 962 | let newi = insert_all_braces xi.braces newi in |
| 963 | |
| 964 | if xi.under_ifthen |
| 965 | then !g#add_arc ((newi, errorexiti), Direct) |
| 966 | else !g#add_arc ((newi, exiti), Direct) |
| 967 | ; |
| 968 | None |
| 969 | | _ -> raise (Impossible 71) |
| 970 | ) |
| 971 | |
| 972 | |
| 973 | (* ------------------------- *) |
| 974 | | Ast_c.Decl decl -> |
| 975 | let s = |
| 976 | match decl with |
| 977 | | (Ast_c.DeclList |
| 978 | ([{v_namei = Some (name, _); v_type = typ; v_storage = sto}, _], _)) -> |
| 979 | "decl:" ^ Ast_c.str_of_name name |
| 980 | | _ -> "decl_novar_or_multivar" |
| 981 | in |
| 982 | |
| 983 | let newi = !g +> add_node (Decl (decl)) lbl s in |
| 984 | !g +> add_arc_opt (starti, newi); |
| 985 | Some newi |
| 986 | |
| 987 | (* ------------------------- *) |
| 988 | | Ast_c.Asm body -> |
| 989 | let newi = !g +> add_node (Asm (stmt, ((body,ii)))) lbl "asm;" in |
| 990 | !g +> add_arc_opt (starti, newi); |
| 991 | Some newi |
| 992 | |
| 993 | | Ast_c.MacroStmt -> |
| 994 | let newi = !g +> add_node (MacroStmt (stmt, ((),ii))) lbl "macro;" in |
| 995 | !g +> add_arc_opt (starti, newi); |
| 996 | Some newi |
| 997 | |
| 998 | |
| 999 | (* ------------------------- *) |
| 1000 | | Ast_c.NestedFunc def -> |
| 1001 | raise (Error NestedFunc) |
| 1002 | |
| 1003 | |
| 1004 | |
| 1005 | |
| 1006 | |
| 1007 | |
| 1008 | |
| 1009 | and aux_statement_list starti (xi, newxi) statxs = |
| 1010 | statxs |
| 1011 | +> List.fold_left (fun starti statement_seq -> |
| 1012 | if !Flag_parsing_c.label_strategy_2 |
| 1013 | then incr counter_for_labels; |
| 1014 | |
| 1015 | let newxi' = |
| 1016 | if !Flag_parsing_c.label_strategy_2 |
| 1017 | then { newxi with labels = xi.labels @ [ !counter_for_labels ] } |
| 1018 | else newxi |
| 1019 | in |
| 1020 | |
| 1021 | match statement_seq with |
| 1022 | | Ast_c.StmtElem statement -> |
| 1023 | aux_statement (starti, newxi') statement |
| 1024 | |
| 1025 | | Ast_c.CppDirectiveStmt directive -> |
| 1026 | pr2_once ("ast_to_flow: filter a directive"); |
| 1027 | starti |
| 1028 | |
| 1029 | | Ast_c.IfdefStmt ifdef -> |
| 1030 | pr2_once ("ast_to_flow: filter a directive"); |
| 1031 | starti |
| 1032 | |
| 1033 | | Ast_c.IfdefStmt2 (ifdefs, xxs) -> |
| 1034 | |
| 1035 | let (head, body, tail) = Common.head_middle_tail ifdefs in |
| 1036 | |
| 1037 | let newi = |
| 1038 | !g +> add_node (IfdefHeader (head)) newxi'.labels "[ifdef]" in |
| 1039 | let taili = |
| 1040 | !g +> add_node (IfdefEndif (tail)) newxi'.labels "[endif]" in |
| 1041 | (* do like for a close brace, see endi.{c,cocci} *) |
| 1042 | let taili_dup = |
| 1043 | mk_fake_node (IfdefEndif (tail)) newxi'.labels [] "[endif]" in |
| 1044 | !g +> add_arc_opt (starti, newi); |
| 1045 | |
| 1046 | let elsenodes = |
| 1047 | body +> List.map (fun elseif -> |
| 1048 | let elsei = |
| 1049 | !g +> add_node (IfdefElse (elseif)) newxi'.labels "[elseif]" in |
| 1050 | !g#add_arc ((newi, elsei), Direct); |
| 1051 | elsei |
| 1052 | ) in |
| 1053 | |
| 1054 | let _finalxs = |
| 1055 | Common.zip (newi::elsenodes) xxs +> List.map (fun (start_nodei, xs)-> |
| 1056 | (* not sure if this is correct... newxi seems to relate to |
| 1057 | the assigned level number *) |
| 1058 | let newerxi = |
| 1059 | { newxi with braces = taili_dup:: newxi.braces } in |
| 1060 | let finalthen = |
| 1061 | aux_statement_list (Some start_nodei) (newxi, newerxi) xs in |
| 1062 | !g +> add_arc_opt (finalthen, taili); |
| 1063 | ) |
| 1064 | in |
| 1065 | |
| 1066 | (* |
| 1067 | This is an attempt to let a statement metavariable match this |
| 1068 | construct, but it doesn't work because #ifdef is not a statement. |
| 1069 | Not sure if this is a good or bad thing, at least if there is no else |
| 1070 | because then no statement might be there. |
| 1071 | let afteri = !g +> add_node AfterNode newxi'.labels "[after]" in |
| 1072 | !g#add_arc ((newi, afteri), Direct); |
| 1073 | !g#add_arc ((afteri, taili), Direct); |
| 1074 | *) |
| 1075 | |
| 1076 | Some taili |
| 1077 | |
| 1078 | ) starti |
| 1079 | |
| 1080 | |
| 1081 | (*****************************************************************************) |
| 1082 | (* Definition of function *) |
| 1083 | (*****************************************************************************) |
| 1084 | |
| 1085 | let (aux_definition: nodei -> definition -> unit) = fun topi funcdef -> |
| 1086 | |
| 1087 | let lbl_start = [!counter_for_labels] in |
| 1088 | |
| 1089 | let ({f_name = namefuncs; |
| 1090 | f_type = functype; |
| 1091 | f_storage= sto; |
| 1092 | f_body= compound; |
| 1093 | f_attr= attrs; |
| 1094 | f_old_c_style = oldstyle; |
| 1095 | }, ii) = funcdef in |
| 1096 | let iifunheader, iicompound = |
| 1097 | (match ii with |
| 1098 | | ioparen::icparen::iobrace::icbrace::iifake::isto -> |
| 1099 | ioparen::icparen::iifake::isto, |
| 1100 | [iobrace;icbrace] |
| 1101 | | _ -> raise (Impossible 72) |
| 1102 | ) |
| 1103 | in |
| 1104 | |
| 1105 | let topstatement = Ast_c.mk_st (Ast_c.Compound compound) iicompound in |
| 1106 | |
| 1107 | let headi = !g +> add_node |
| 1108 | (FunHeader ({ |
| 1109 | Ast_c.f_name = namefuncs; |
| 1110 | f_type = functype; |
| 1111 | f_storage = sto; |
| 1112 | f_attr = attrs; |
| 1113 | f_body = [] (* empty body *); |
| 1114 | f_old_c_style = oldstyle; |
| 1115 | }, iifunheader)) |
| 1116 | lbl_start ("function " ^ Ast_c.str_of_name namefuncs) in |
| 1117 | let enteri = !g +> add_node Enter lbl_0 "[enter]" in |
| 1118 | let exiti = !g +> add_node Exit lbl_0 "[exit]" in |
| 1119 | let errorexiti = !g +> add_node ErrorExit lbl_0 "[errorexit]" in |
| 1120 | |
| 1121 | !g#add_arc ((topi, headi), Direct); |
| 1122 | !g#add_arc ((headi, enteri), Direct); |
| 1123 | |
| 1124 | (* ---------------------------------------------------------------- *) |
| 1125 | (* todocheck: assert ? such as we have "consommer" tous les labels *) |
| 1126 | let info = |
| 1127 | { initial_info with |
| 1128 | labels = lbl_start; |
| 1129 | labels_assoc = compute_labels_and_create_them topstatement; |
| 1130 | exiti = Some exiti; |
| 1131 | errorexiti = Some errorexiti; |
| 1132 | compound_caller = FunctionDef; |
| 1133 | } |
| 1134 | in |
| 1135 | |
| 1136 | let lasti = aux_statement (Some enteri, info) topstatement in |
| 1137 | !g +> add_arc_opt (lasti, exiti) |
| 1138 | |
| 1139 | (*****************************************************************************) |
| 1140 | (* Entry point *) |
| 1141 | (*****************************************************************************) |
| 1142 | |
| 1143 | (* Helpers for SpecialDeclMacro. |
| 1144 | * |
| 1145 | * could also force the coccier to define |
| 1146 | * the toplevel macro statement as in @@ toplevel_declarator MACRO_PARAM;@@ |
| 1147 | * and so I would not need this hack and instead I would to a cleaner |
| 1148 | * match in cocci_vs_c_3.ml of a A.MacroTop vs B.MacroTop |
| 1149 | * |
| 1150 | * todo: update: now I do what I just described, so can remove this code ? |
| 1151 | *) |
| 1152 | let specialdeclmacro_to_stmt (s, args, ii) = |
| 1153 | let (iis, iiopar, iicpar, iiptvirg) = tuple_of_list4 ii in |
| 1154 | let ident = Ast_c.RegularName (s, [iis]) in |
| 1155 | let identfinal = Ast_c.mk_e (Ast_c.Ident (ident)) Ast_c.noii in |
| 1156 | let f = Ast_c.mk_e (Ast_c.FunCall (identfinal, args)) [iiopar;iicpar] in |
| 1157 | let stmt = Ast_c.mk_st (Ast_c.ExprStatement (Some f)) [iiptvirg] in |
| 1158 | stmt, (f, [iiptvirg]) |
| 1159 | |
| 1160 | |
| 1161 | |
| 1162 | let rec ast_to_control_flow e = |
| 1163 | |
| 1164 | (* globals (re)initialialisation *) |
| 1165 | g := (new ograph_mutable); |
| 1166 | counter_for_labels := 1; |
| 1167 | counter_for_braces := 0; |
| 1168 | counter_for_switch := 0; |
| 1169 | |
| 1170 | let topi = !g +> add_node TopNode lbl_0 "[top]" in |
| 1171 | |
| 1172 | match e with |
| 1173 | | Ast_c.Namespace (defs, _) -> |
| 1174 | (* todo: incorporate the other defs *) |
| 1175 | let rec loop defs = |
| 1176 | match defs with |
| 1177 | | [] -> None |
| 1178 | | def :: defs -> |
| 1179 | match ast_to_control_flow def with |
| 1180 | | None -> loop defs |
| 1181 | | x -> x in |
| 1182 | loop defs |
| 1183 | | Ast_c.Definition ((defbis,_) as def) -> |
| 1184 | let _funcs = defbis.f_name in |
| 1185 | let _c = defbis.f_body in |
| 1186 | (* if !Flag.show_misc then pr2 ("build info function " ^ funcs); *) |
| 1187 | aux_definition topi def; |
| 1188 | Some !g |
| 1189 | |
| 1190 | | Ast_c.Declaration _ |
| 1191 | | Ast_c.CppTop (Ast_c.Include _) |
| 1192 | | Ast_c.MacroTop _ |
| 1193 | -> |
| 1194 | let (elem, str) = |
| 1195 | match e with |
| 1196 | | Ast_c.Declaration decl -> |
| 1197 | (Control_flow_c.Decl decl), "decl" |
| 1198 | | Ast_c.CppTop (Ast_c.Include inc) -> |
| 1199 | (Control_flow_c.Include inc), "#include" |
| 1200 | | Ast_c.MacroTop (s, args, ii) -> |
| 1201 | let (st, (e, ii)) = specialdeclmacro_to_stmt (s, args, ii) in |
| 1202 | (Control_flow_c.ExprStatement (st, (Some e, ii))), "macrotoplevel" |
| 1203 | (*(Control_flow_c.MacroTop (s, args,ii), "macrotoplevel") *) |
| 1204 | | _ -> raise (Impossible 73) |
| 1205 | in |
| 1206 | let ei = !g +> add_node elem lbl_0 str in |
| 1207 | let endi = !g +> add_node EndNode lbl_0 "[end]" in |
| 1208 | |
| 1209 | !g#add_arc ((topi, ei),Direct); |
| 1210 | !g#add_arc ((ei, endi),Direct); |
| 1211 | Some !g |
| 1212 | |
| 1213 | | Ast_c.CppTop (Ast_c.Define ((id,ii), (defkind, defval))) -> |
| 1214 | let s = |
| 1215 | match defkind with |
| 1216 | Ast_c.Undef -> "#undef " ^ id |
| 1217 | | _ -> "#define " ^ id in |
| 1218 | let headeri = !g+>add_node (DefineHeader ((id, ii), defkind)) lbl_0 s in |
| 1219 | !g#add_arc ((topi, headeri),Direct); |
| 1220 | |
| 1221 | (match defval with |
| 1222 | | Ast_c.DefineExpr e -> |
| 1223 | let ei = !g +> add_node (DefineExpr e) lbl_0 "defexpr" in |
| 1224 | let endi = !g +> add_node EndNode lbl_0 "[end]" in |
| 1225 | !g#add_arc ((headeri, ei) ,Direct); |
| 1226 | !g#add_arc ((ei, endi) ,Direct); |
| 1227 | |
| 1228 | | Ast_c.DefineType ft -> |
| 1229 | let ei = !g +> add_node (DefineType ft) lbl_0 "deftyp" in |
| 1230 | let endi = !g +> add_node EndNode lbl_0 "[end]" in |
| 1231 | !g#add_arc ((headeri, ei) ,Direct); |
| 1232 | !g#add_arc ((ei, endi) ,Direct); |
| 1233 | |
| 1234 | | Ast_c.DefineStmt st -> |
| 1235 | (* can have some return; inside the statement *) |
| 1236 | let exiti = !g +> add_node Exit lbl_0 "[exit]" in |
| 1237 | let errorexiti = !g +> add_node ErrorExit lbl_0 "[errorexit]" in |
| 1238 | let goto_labels = compute_labels_and_create_them st in |
| 1239 | |
| 1240 | let info = { initial_info with |
| 1241 | labels_assoc = goto_labels; |
| 1242 | exiti = Some exiti; |
| 1243 | errorexiti = Some errorexiti; |
| 1244 | } |
| 1245 | in |
| 1246 | |
| 1247 | let lasti = aux_statement (Some headeri , info) st in |
| 1248 | lasti +> do_option (fun lasti -> |
| 1249 | (* todo? if don't have a lasti ? no EndNode ? CTL will work ? *) |
| 1250 | let endi = !g +> add_node EndNode lbl_0 "[end]" in |
| 1251 | !g#add_arc ((lasti, endi), Direct) |
| 1252 | ) |
| 1253 | |
| 1254 | |
| 1255 | | Ast_c.DefineDoWhileZero ((st,_e), ii) -> |
| 1256 | let goto_labels = compute_labels_and_create_them st in |
| 1257 | let info = { initial_info with |
| 1258 | labels_assoc = goto_labels } in |
| 1259 | |
| 1260 | let headerdoi = |
| 1261 | !g +> add_node (DefineDoWhileZeroHeader ((),ii)) lbl_0 "do0" in |
| 1262 | !g#add_arc ((headeri, headerdoi), Direct); |
| 1263 | let lasti = aux_statement (Some headerdoi , info) st in |
| 1264 | lasti +> do_option (fun lasti -> |
| 1265 | let endi = !g +> add_node EndNode lbl_0 "[end]" in |
| 1266 | !g#add_arc ((lasti, endi), Direct) |
| 1267 | ) |
| 1268 | |
| 1269 | | Ast_c.DefineFunction def -> |
| 1270 | aux_definition headeri def; |
| 1271 | |
| 1272 | | Ast_c.DefineText (s, s_ii) -> |
| 1273 | raise (Error(Define(pinfo_of_ii ii))) |
| 1274 | | Ast_c.DefineEmpty -> |
| 1275 | let endi = !g +> add_node EndNode lbl_0 "[end]" in |
| 1276 | !g#add_arc ((headeri, endi),Direct); |
| 1277 | | Ast_c.DefineInit _ -> |
| 1278 | raise (Error(Define(pinfo_of_ii ii))) |
| 1279 | | Ast_c.DefineMulti sts -> (* christia: todo *) |
| 1280 | raise (Error(Define(pinfo_of_ii ii))) |
| 1281 | | Ast_c.DefineTodo -> |
| 1282 | raise (Error(Define(pinfo_of_ii ii))) |
| 1283 | |
| 1284 | (* old: |
| 1285 | | Ast_c.DefineText (s, ii) -> |
| 1286 | let endi = !g +> add_node EndNode lbl_0 "[end]" in |
| 1287 | !g#add_arc ((headeri, endi),Direct); |
| 1288 | | Ast_c.DefineInit _ -> |
| 1289 | let endi = !g +> add_node EndNode lbl_0 "[end]" in |
| 1290 | !g#add_arc ((headeri, endi),Direct); |
| 1291 | | Ast_c.DefineTodo -> |
| 1292 | let endi = !g +> add_node EndNode lbl_0 "[end]" in |
| 1293 | !g#add_arc ((headeri, endi),Direct); |
| 1294 | *) |
| 1295 | ); |
| 1296 | |
| 1297 | Some !g |
| 1298 | |
| 1299 | | _ -> None |
| 1300 | |
| 1301 | |
| 1302 | (*****************************************************************************) |
| 1303 | (* CFG loop annotation *) |
| 1304 | (*****************************************************************************) |
| 1305 | |
| 1306 | let annotate_loop_nodes g = |
| 1307 | let firsti = Control_flow_c.first_node g in |
| 1308 | |
| 1309 | (* just for opti a little *) |
| 1310 | let already = Hashtbl.create 101 in |
| 1311 | |
| 1312 | g +> Ograph_extended.dfs_iter_with_path firsti (fun xi path -> |
| 1313 | Hashtbl.add already xi true; |
| 1314 | let succ = g#successors xi in |
| 1315 | let succ = succ#tolist in |
| 1316 | succ +> List.iter (fun (yi,_edge) -> |
| 1317 | if Hashtbl.mem already yi && List.mem yi (xi::path) |
| 1318 | then |
| 1319 | let node = g#nodes#find yi in |
| 1320 | let ((node2, nodeinfo), nodestr) = node in |
| 1321 | let node' = ((node2, {nodeinfo with is_loop = true}), (nodestr ^ "*")) |
| 1322 | in g#replace_node (yi, node'); |
| 1323 | ); |
| 1324 | ); |
| 1325 | |
| 1326 | |
| 1327 | g |
| 1328 | |
| 1329 | |
| 1330 | (*****************************************************************************) |
| 1331 | (* CFG checks *) |
| 1332 | (*****************************************************************************) |
| 1333 | |
| 1334 | (* the second phase, deadcode detection. Old code was raising DeadCode if |
| 1335 | * lasti = None, but maybe not. In fact if have 2 return in the then |
| 1336 | * and else of an if ? |
| 1337 | * |
| 1338 | * alt: but can assert that at least there exist |
| 1339 | * a node to exiti, just check #pred of exiti. |
| 1340 | * |
| 1341 | * Why so many deadcode in Linux ? Ptet que le label est utilisé |
| 1342 | * mais dans le corps d'une macro et donc on le voit pas :( |
| 1343 | * |
| 1344 | *) |
| 1345 | let deadcode_detection g = |
| 1346 | |
| 1347 | g#nodes#iter (fun (k, node) -> |
| 1348 | let pred = g#predecessors k in |
| 1349 | if pred#null then |
| 1350 | (match unwrap node with |
| 1351 | (* old: |
| 1352 | * | Enter -> () |
| 1353 | * | EndStatement _ -> pr2 "deadcode sur fake node, pas grave"; |
| 1354 | *) |
| 1355 | | TopNode -> () |
| 1356 | | FunHeader _ -> () |
| 1357 | | ErrorExit -> () |
| 1358 | | Exit -> () (* if have 'loop: if(x) return; i++; goto loop' *) |
| 1359 | | SeqEnd _ -> () (* todo?: certaines '}' deviennent orphelins *) |
| 1360 | | x -> |
| 1361 | (match Control_flow_c.extract_fullstatement node with |
| 1362 | | Some st -> |
| 1363 | let ii = Ast_c.get_ii_st_take_care st in |
| 1364 | raise (Error (DeadCode (Some (pinfo_of_ii ii)))) |
| 1365 | | _ -> pr2 "CFG: orphelin nodes, maybe something weird happened" |
| 1366 | ) |
| 1367 | ) |
| 1368 | ) |
| 1369 | |
| 1370 | (*------------------------------------------------------------------------*) |
| 1371 | (* special_cfg_braces: the check are really specific to the way we |
| 1372 | * have build our control_flow, with the { } in the graph so normally |
| 1373 | * all those checks here are useless. |
| 1374 | * |
| 1375 | * ver1: to better error reporting, to report earlier the message, pass |
| 1376 | * the list of '{' (containing morover a brace_identifier) instead of |
| 1377 | * just the depth. |
| 1378 | *) |
| 1379 | |
| 1380 | let (check_control_flow: cflow -> unit) = fun g -> |
| 1381 | |
| 1382 | let nodes = g#nodes in |
| 1383 | let starti = first_node g in |
| 1384 | let visited = ref (new oassocb []) in |
| 1385 | |
| 1386 | let print_trace_error xs = pr2 "PB with flow:"; Common.pr2_gen xs; in |
| 1387 | |
| 1388 | let rec dfs (nodei, (* Depth depth,*) startbraces, trace) = |
| 1389 | let trace2 = nodei::trace in |
| 1390 | if !visited#haskey nodei |
| 1391 | then |
| 1392 | (* if loop back, just check that go back to a state where have same depth |
| 1393 | number *) |
| 1394 | let (*(Depth depth2)*) startbraces2 = !visited#find nodei in |
| 1395 | if (*(depth = depth2)*) startbraces <> startbraces2 |
| 1396 | then |
| 1397 | begin |
| 1398 | pr2 (sprintf "PB with flow: the node %d has not same braces count" |
| 1399 | nodei); |
| 1400 | print_trace_error trace2 |
| 1401 | end |
| 1402 | else |
| 1403 | let children = g#successors nodei in |
| 1404 | let _ = visited := !visited#add (nodei, (* Depth depth*) startbraces) in |
| 1405 | |
| 1406 | (* old: good, but detect a missing } too late, only at the end |
| 1407 | let newdepth = |
| 1408 | (match fst (nodes#find nodei) with |
| 1409 | | StartBrace i -> Depth (depth + 1) |
| 1410 | | EndBrace i -> Depth (depth - 1) |
| 1411 | | _ -> Depth depth |
| 1412 | ) |
| 1413 | in |
| 1414 | *) |
| 1415 | let newdepth = |
| 1416 | (match unwrap (nodes#find nodei), startbraces with |
| 1417 | | SeqStart (_,i,_), xs -> i::xs |
| 1418 | | SeqEnd (i,_), j::xs -> |
| 1419 | if i =|= j |
| 1420 | then xs |
| 1421 | else |
| 1422 | begin |
| 1423 | pr2 (sprintf ("PB with flow: not corresponding match between }%d and excpeted }%d at node %d") i j nodei); |
| 1424 | print_trace_error trace2; |
| 1425 | xs |
| 1426 | end |
| 1427 | | SeqEnd (i,_), [] -> |
| 1428 | pr2 (sprintf "PB with flow: too much } at }%d " i); |
| 1429 | print_trace_error trace2; |
| 1430 | [] |
| 1431 | | _, xs -> xs |
| 1432 | ) |
| 1433 | in |
| 1434 | |
| 1435 | |
| 1436 | if null children#tolist |
| 1437 | then |
| 1438 | if (* (depth = 0) *) startbraces <> [] |
| 1439 | then print_trace_error trace2 |
| 1440 | else |
| 1441 | children#tolist +> List.iter (fun (nodei,_) -> |
| 1442 | dfs (nodei, newdepth, trace2) |
| 1443 | ) |
| 1444 | in |
| 1445 | |
| 1446 | dfs (starti, (* Depth 0*) [], []) |
| 1447 | |
| 1448 | (*****************************************************************************) |
| 1449 | (* Error report *) |
| 1450 | (*****************************************************************************) |
| 1451 | |
| 1452 | let report_error error = |
| 1453 | let error_from_info info = |
| 1454 | Common.error_message_short info.file ("", info.charpos) |
| 1455 | in |
| 1456 | match error with |
| 1457 | | DeadCode infoopt -> |
| 1458 | (match infoopt with |
| 1459 | | None -> pr2 "FLOW: deadcode detected, but cant trace back the place" |
| 1460 | | Some info -> pr2 ("FLOW: deadcode detected: " ^ error_from_info info) |
| 1461 | ) |
| 1462 | | CaseNoSwitch info -> |
| 1463 | pr2 ("FLOW: case without corresponding switch: " ^ error_from_info info) |
| 1464 | | OnlyBreakInSwitch info -> |
| 1465 | pr2 ("FLOW: only break are allowed in switch: " ^ error_from_info info) |
| 1466 | | WeirdSwitch info -> |
| 1467 | pr2 ("FLOW: weird switch: " ^ error_from_info info) |
| 1468 | | NoEnclosingLoop (info) -> |
| 1469 | pr2 ("FLOW: can't find enclosing loop: " ^ error_from_info info) |
| 1470 | | GotoCantFindLabel (s, info) -> |
| 1471 | pr2 ("FLOW: cant jump to " ^ s ^ ": because we can't find this label") |
| 1472 | | NoExit info -> |
| 1473 | pr2 ("FLOW: can't find exit or error exit: " ^ error_from_info info) |
| 1474 | | DuplicatedLabel s -> |
| 1475 | pr2 ("FLOW: duplicate label " ^ s) |
| 1476 | | NestedFunc -> |
| 1477 | pr2 ("FLOW: not handling yet nested function") |
| 1478 | | ComputedGoto -> |
| 1479 | pr2 ("FLOW: not handling computed goto yet") |
| 1480 | | Define info -> |
| 1481 | pr2 ("Unsupported form of #define: " ^ error_from_info info) |