parsing_cocci/visitor_ast.ml

   1 (*
   2 * Copyright 2005-2009, 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 module Ast0 = Ast0_cocci
  24 module Ast = Ast_cocci
  25
  26 (* --------------------------------------------------------------------- *)
  27 (* Generic traversal: combiner *)
  28 (* parameters:
  29    combining function
  30    treatment of: mcode, identifiers, expressions, fullTypes, types,
  31    declarations, statements, toplevels
  32    default value for options *)
  33
  34 type 'a combiner =
  35     {combiner_ident : Ast.ident -> 'a;
  36      combiner_expression : Ast.expression -> 'a;
  37      combiner_fullType : Ast.fullType -> 'a;
  38      combiner_typeC : Ast.typeC -> 'a;
  39      combiner_declaration : Ast.declaration -> 'a;
  40      combiner_initialiser : Ast.initialiser -> 'a;
  41      combiner_parameter : Ast.parameterTypeDef -> 'a;
  42      combiner_parameter_list : Ast.parameter_list -> 'a;
  43      combiner_rule_elem : Ast.rule_elem -> 'a;
  44      combiner_statement : Ast.statement -> 'a;
  45      combiner_case_line : Ast.case_line -> 'a;
  46      combiner_top_level : Ast.top_level -> 'a;
  47      combiner_anything : Ast.anything  -> 'a;
  48      combiner_expression_dots : Ast.expression Ast.dots -> 'a;
  49      combiner_statement_dots : Ast.statement Ast.dots -> 'a;
  50      combiner_declaration_dots : Ast.declaration Ast.dots -> 'a}
  51
  52 type ('mc,'a) cmcode = 'a combiner -> 'mc Ast_cocci.mcode -> 'a
  53 type ('cd,'a) ccode = 'a combiner -> ('cd -> 'a) -> 'cd -> 'a
  54
  55
  56 let combiner bind option_default
  57     meta_mcodefn string_mcodefn const_mcodefn assign_mcodefn fix_mcodefn
  58     unary_mcodefn binary_mcodefn
  59     cv_mcodefn sign_mcodefn struct_mcodefn storage_mcodefn
  60     inc_file_mcodefn
  61     expdotsfn paramdotsfn stmtdotsfn decldotsfn
  62     identfn exprfn ftfn tyfn initfn paramfn declfn rulefn stmtfn casefn
  63     topfn anyfn =
  64   let multibind l =
  65     let rec loop = function
  66         [] -> option_default
  67       | [x] -> x
  68       | x::xs -> bind x (loop xs) in
  69     loop l in
  70   let get_option f = function
  71       Some x -> f x
  72     | None -> option_default in
  73
  74   let rec meta_mcode x = meta_mcodefn all_functions x
  75   and string_mcode x = string_mcodefn all_functions x
  76   and const_mcode x = const_mcodefn all_functions x
  77   and assign_mcode x = assign_mcodefn all_functions x
  78   and fix_mcode x = fix_mcodefn all_functions x
  79   and unary_mcode x = unary_mcodefn all_functions x
  80   and binary_mcode x = binary_mcodefn all_functions x
  81   and cv_mcode x = cv_mcodefn all_functions x
  82   and sign_mcode x = sign_mcodefn all_functions x
  83   and struct_mcode x = struct_mcodefn all_functions x
  84   and storage_mcode x = storage_mcodefn all_functions x
  85   and inc_file_mcode x = inc_file_mcodefn all_functions x
  86
  87   and expression_dots d =
  88     let k d =
  89       match Ast.unwrap d with
  90         Ast.DOTS(l) | Ast.CIRCLES(l) | Ast.STARS(l) ->
  91           multibind (List.map expression l) in
  92     expdotsfn all_functions k d
  93
  94   and parameter_dots d =
  95     let k d =
  96       match Ast.unwrap d with
  97         Ast.DOTS(l) | Ast.CIRCLES(l) | Ast.STARS(l) ->
  98           multibind (List.map parameterTypeDef l) in
  99     paramdotsfn all_functions k d
 100
 101   and statement_dots d =
 102     let k d =
 103       match Ast.unwrap d with
 104         Ast.DOTS(l) | Ast.CIRCLES(l) | Ast.STARS(l) ->
 105           multibind (List.map statement l) in
 106     stmtdotsfn all_functions k d
 107
 108   and declaration_dots d =
 109     let k d =
 110       match Ast.unwrap d with
 111         Ast.DOTS(l) | Ast.CIRCLES(l) | Ast.STARS(l) ->
 112           multibind (List.map declaration l) in
 113     decldotsfn all_functions k d
 114
 115   and ident i =
 116     let k i =
 117       match Ast.unwrap i with
 118         Ast.Id(name) -> string_mcode name
 119       | Ast.MetaId(name,_,_,_) -> meta_mcode name
 120       | Ast.MetaFunc(name,_,_,_) -> meta_mcode name
 121       | Ast.MetaLocalFunc(name,_,_,_) -> meta_mcode name
 122       | Ast.OptIdent(id) -> ident id
 123       | Ast.UniqueIdent(id) -> ident id in
 124     identfn all_functions k i
 125
 126   and expression e =
 127     let k e =
 128       match Ast.unwrap e with
 129         Ast.Ident(id) -> ident id
 130       | Ast.Constant(const) -> const_mcode const
 131       | Ast.FunCall(fn,lp,args,rp) ->
 132           multibind [expression fn; string_mcode lp; expression_dots args;
 133                       string_mcode rp]
 134       | Ast.Assignment(left,op,right,simple) ->
 135           multibind [expression left; assign_mcode op; expression right]
 136       | Ast.CondExpr(exp1,why,exp2,colon,exp3) ->
 137           multibind [expression exp1; string_mcode why;
 138                       get_option expression exp2; string_mcode colon;
 139                       expression exp3]
 140       | Ast.Postfix(exp,op) -> bind (expression exp) (fix_mcode op)
 141       | Ast.Infix(exp,op) -> bind (fix_mcode op) (expression exp)
 142       | Ast.Unary(exp,op) -> bind (unary_mcode op) (expression exp)
 143       | Ast.Binary(left,op,right) ->
 144           multibind [expression left; binary_mcode op; expression right]
 145       | Ast.Nested(left,op,right) ->
 146           multibind [expression left; binary_mcode op; expression right]
 147       | Ast.Paren(lp,exp,rp) ->
 148           multibind [string_mcode lp; expression exp; string_mcode rp]
 149       | Ast.ArrayAccess(exp1,lb,exp2,rb) ->
 150           multibind
 151             [expression exp1; string_mcode lb; expression exp2;
 152               string_mcode rb]
 153       | Ast.RecordAccess(exp,pt,field) ->
 154           multibind [expression exp; string_mcode pt; ident field]
 155       | Ast.RecordPtAccess(exp,ar,field) ->
 156           multibind [expression exp; string_mcode ar; ident field]
 157       | Ast.Cast(lp,ty,rp,exp) ->
 158           multibind
 159             [string_mcode lp; fullType ty; string_mcode rp; expression exp]
 160       | Ast.SizeOfExpr(szf,exp) ->
 161           multibind [string_mcode szf; expression exp]
 162       | Ast.SizeOfType(szf,lp,ty,rp) ->
 163           multibind
 164             [string_mcode szf; string_mcode lp; fullType ty; string_mcode rp]
 165       | Ast.TypeExp(ty) -> fullType ty
 166       | Ast.MetaErr(name,_,_,_)
 167       | Ast.MetaExpr(name,_,_,_,_,_)
 168       | Ast.MetaExprList(name,_,_,_) -> meta_mcode name
 169       | Ast.EComma(cm) -> string_mcode cm
 170       | Ast.DisjExpr(exp_list) -> multibind (List.map expression exp_list)
 171       | Ast.NestExpr(expr_dots,whencode,multi) ->
 172           bind (expression_dots expr_dots) (get_option expression whencode)
 173       | Ast.Edots(dots,whencode) | Ast.Ecircles(dots,whencode)
 174       | Ast.Estars(dots,whencode) ->
 175           bind (string_mcode dots) (get_option expression whencode)
 176       | Ast.OptExp(exp) | Ast.UniqueExp(exp) ->
 177           expression exp in
 178     exprfn all_functions k e
 179
 180   and fullType ft =
 181     let k ft =
 182       match Ast.unwrap ft with
 183         Ast.Type(cv,ty) -> bind (get_option cv_mcode cv) (typeC ty)
 184       | Ast.DisjType(types) -> multibind (List.map fullType types)
 185       | Ast.OptType(ty) -> fullType ty
 186       | Ast.UniqueType(ty) -> fullType ty in
 187     ftfn all_functions k ft
 188
 189   and function_pointer (ty,lp1,star,rp1,lp2,params,rp2) extra =
 190     (* have to put the treatment of the identifier into the right position *)
 191     multibind
 192       ([fullType ty; string_mcode lp1; string_mcode star] @ extra @
 193        [string_mcode rp1;
 194          string_mcode lp2; parameter_dots params; string_mcode rp2])
 195
 196   and function_type (ty,lp1,params,rp1) extra =
 197     (* have to put the treatment of the identifier into the right position *)
 198     multibind
 199       ([get_option fullType ty] @ extra @
 200        [string_mcode lp1; parameter_dots params; string_mcode rp1])
 201
 202   and array_type (ty,lb,size,rb) extra =
 203     multibind
 204       ([fullType ty] @ extra @
 205        [string_mcode lb; get_option expression size; string_mcode rb])
 206
 207   and typeC ty =
 208     let k ty =
 209       match Ast.unwrap ty with
 210         Ast.BaseType(ty,strings) -> multibind (List.map string_mcode strings)
 211       | Ast.SignedT(sgn,ty) -> bind (sign_mcode sgn) (get_option typeC ty)
 212       | Ast.Pointer(ty,star) ->
 213           bind (fullType ty) (string_mcode star)
 214       | Ast.FunctionPointer(ty,lp1,star,rp1,lp2,params,rp2) ->
 215           function_pointer (ty,lp1,star,rp1,lp2,params,rp2) []
 216       | Ast.FunctionType (_,ty,lp1,params,rp1) ->
 217           function_type (ty,lp1,params,rp1) []
 218       | Ast.Array(ty,lb,size,rb) -> array_type (ty,lb,size,rb) []
 219       | Ast.EnumName(kind,name) -> bind (string_mcode kind) (ident name)
 220       | Ast.StructUnionName(kind,name) ->
 221           bind (struct_mcode kind) (get_option ident name)
 222       | Ast.StructUnionDef(ty,lb,decls,rb) ->
 223           multibind
 224             [fullType ty; string_mcode lb; declaration_dots decls;
 225               string_mcode rb]
 226       | Ast.TypeName(name) -> string_mcode name
 227       | Ast.MetaType(name,_,_) -> meta_mcode name in
 228     tyfn all_functions k ty
 229
 230   and named_type ty id =
 231     match Ast.unwrap ty with
 232       Ast.Type(None,ty1) ->
 233         (match Ast.unwrap ty1 with
 234           Ast.FunctionPointer(ty,lp1,star,rp1,lp2,params,rp2) ->
 235             function_pointer (ty,lp1,star,rp1,lp2,params,rp2) [ident id]
 236         | Ast.FunctionType(_,ty,lp1,params,rp1) ->
 237             function_type (ty,lp1,params,rp1) [ident id]
 238         | Ast.Array(ty,lb,size,rb) -> array_type (ty,lb,size,rb) [ident id]
 239         | _ -> bind (fullType ty) (ident id))
 240     | _ -> bind (fullType ty) (ident id)
 241
 242   and declaration d =
 243     let k d =
 244       match Ast.unwrap d with
 245         Ast.Init(stg,ty,id,eq,ini,sem) ->
 246           bind (get_option storage_mcode stg)
 247             (bind (named_type ty id)
 248                (multibind
 249                   [string_mcode eq; initialiser ini; string_mcode sem]))
 250       | Ast.UnInit(stg,ty,id,sem) ->
 251           bind (get_option storage_mcode stg)
 252             (bind (named_type ty id) (string_mcode sem))
 253       | Ast.MacroDecl(name,lp,args,rp,sem) ->
 254           multibind
 255             [ident name; string_mcode lp; expression_dots args;
 256               string_mcode rp; string_mcode sem]
 257       | Ast.TyDecl(ty,sem) -> bind (fullType ty) (string_mcode sem)
 258       | Ast.Typedef(stg,ty,id,sem) ->
 259           bind (string_mcode stg)
 260             (bind (fullType ty) (bind (typeC id) (string_mcode sem)))
 261       | Ast.DisjDecl(decls) -> multibind (List.map declaration decls)
 262       | Ast.Ddots(dots,whencode) ->
 263           bind (string_mcode dots) (get_option declaration whencode)
 264       | Ast.MetaDecl(name,_,_) -> meta_mcode name
 265       | Ast.OptDecl(decl) -> declaration decl
 266       | Ast.UniqueDecl(decl) -> declaration decl in
 267     declfn all_functions k d
 268
 269   and initialiser i =
 270     let k i =
 271       match Ast.unwrap i with
 272         Ast.MetaInit(name,_,_) -> meta_mcode name
 273       | Ast.InitExpr(exp) -> expression exp
 274       | Ast.InitList(lb,initlist,rb,whencode) ->
 275           multibind
 276             [string_mcode lb;
 277               multibind (List.map initialiser initlist);
 278               string_mcode rb;
 279               multibind (List.map initialiser whencode)]
 280       | Ast.InitGccName(name,eq,ini) ->
 281           multibind [ident name; string_mcode eq; initialiser ini]
 282       | Ast.InitGccExt(designators,eq,ini) ->
 283           multibind
 284             ((List.map designator designators) @
 285              [string_mcode eq; initialiser ini])
 286       | Ast.IComma(cm) -> string_mcode cm
 287       | Ast.OptIni(i) -> initialiser i
 288       | Ast.UniqueIni(i) -> initialiser i in
 289     initfn all_functions k i
 290
 291   and designator = function
 292       Ast.DesignatorField(dot,id) -> bind (string_mcode dot) (ident id)
 293     | Ast.DesignatorIndex(lb,exp,rb) ->
 294         bind (string_mcode lb) (bind (expression exp) (string_mcode rb))
 295     | Ast.DesignatorRange(lb,min,dots,max,rb) ->
 296         multibind
 297           [string_mcode lb; expression min; string_mcode dots;
 298             expression max; string_mcode rb]
 299
 300   and parameterTypeDef p =
 301     let k p =
 302       match Ast.unwrap p with
 303         Ast.VoidParam(ty) -> fullType ty
 304       | Ast.Param(ty,Some id) -> named_type ty id
 305       | Ast.Param(ty,None) -> fullType ty
 306       | Ast.MetaParam(name,_,_) -> meta_mcode name
 307       | Ast.MetaParamList(name,_,_,_) -> meta_mcode name
 308       | Ast.PComma(cm) -> string_mcode cm
 309       | Ast.Pdots(dots) -> string_mcode dots
 310       | Ast.Pcircles(dots) -> string_mcode dots
 311       | Ast.OptParam(param) -> parameterTypeDef param
 312       | Ast.UniqueParam(param) -> parameterTypeDef param in
 313     paramfn all_functions k p
 314
 315   and rule_elem re =
 316     let k re =
 317       match Ast.unwrap re with
 318         Ast.FunHeader(_,_,fi,name,lp,params,rp) ->
 319           multibind
 320             ((List.map fninfo fi) @
 321              [ident name;string_mcode lp;parameter_dots params;
 322                string_mcode rp])
 323       | Ast.Decl(_,_,decl) -> declaration decl
 324       | Ast.SeqStart(brace) -> string_mcode brace
 325       | Ast.SeqEnd(brace) -> string_mcode brace
 326       | Ast.ExprStatement(exp,sem) ->
 327           bind (expression exp) (string_mcode sem)
 328       | Ast.IfHeader(iff,lp,exp,rp) ->
 329           multibind [string_mcode iff; string_mcode lp; expression exp;
 330                       string_mcode rp]
 331       | Ast.Else(els) -> string_mcode els
 332       | Ast.WhileHeader(whl,lp,exp,rp) ->
 333           multibind [string_mcode whl; string_mcode lp; expression exp;
 334                       string_mcode rp]
 335       | Ast.DoHeader(d) -> string_mcode d
 336       | Ast.WhileTail(whl,lp,exp,rp,sem) ->
 337           multibind [string_mcode whl; string_mcode lp; expression exp;
 338                       string_mcode rp; string_mcode sem]
 339       | Ast.ForHeader(fr,lp,e1,sem1,e2,sem2,e3,rp) ->
 340           multibind [string_mcode fr; string_mcode lp;
 341                       get_option expression e1; string_mcode sem1;
 342                       get_option expression e2; string_mcode sem2;
 343                       get_option expression e3; string_mcode rp]
 344       | Ast.IteratorHeader(nm,lp,args,rp) ->
 345           multibind [ident nm; string_mcode lp;
 346                       expression_dots args; string_mcode rp]
 347       | Ast.SwitchHeader(switch,lp,exp,rp) ->
 348           multibind [string_mcode switch; string_mcode lp; expression exp;
 349                       string_mcode rp]
 350       | Ast.Break(br,sem) -> bind (string_mcode br) (string_mcode sem)
 351       | Ast.Continue(cont,sem) -> bind (string_mcode cont) (string_mcode sem)
 352       | Ast.Label(l,dd) -> bind (ident l) (string_mcode dd)
 353       | Ast.Goto(goto,l,sem) ->
 354           bind (string_mcode goto) (bind (ident l) (string_mcode sem))
 355       | Ast.Return(ret,sem) -> bind (string_mcode ret) (string_mcode sem)
 356       | Ast.ReturnExpr(ret,exp,sem) ->
 357           multibind [string_mcode ret; expression exp; string_mcode sem]
 358       | Ast.MetaStmt(name,_,_,_) -> meta_mcode name
 359       | Ast.MetaStmtList(name,_,_) -> meta_mcode name
 360       | Ast.MetaRuleElem(name,_,_) -> meta_mcode name
 361       | Ast.Exp(exp) -> expression exp
 362       | Ast.TopExp(exp) -> expression exp
 363       | Ast.Ty(ty) -> fullType ty
 364       | Ast.TopInit(init) -> initialiser init
 365       | Ast.Include(inc,name) -> bind (string_mcode inc) (inc_file_mcode name)
 366       | Ast.DefineHeader(def,id,params) ->
 367           multibind [string_mcode def; ident id; define_parameters params]
 368       | Ast.Default(def,colon) -> bind (string_mcode def) (string_mcode colon)
 369       | Ast.Case(case,exp,colon) ->
 370           multibind [string_mcode case; expression exp; string_mcode colon]
 371       | Ast.DisjRuleElem(res) -> multibind (List.map rule_elem res) in
 372     rulefn all_functions k re
 373
 374   (* not parameterizable for now... *)
 375   and define_parameters p =
 376     let k p =
 377       match Ast.unwrap p with
 378         Ast.NoParams -> option_default
 379       | Ast.DParams(lp,params,rp) ->
 380           multibind
 381             [string_mcode lp; define_param_dots params; string_mcode rp] in
 382     k p
 383
 384   and define_param_dots d =
 385     let k d =
 386       match Ast.unwrap d with
 387         Ast.DOTS(l) | Ast.CIRCLES(l) | Ast.STARS(l) ->
 388           multibind (List.map define_param l) in
 389     k d
 390
 391   and define_param p =
 392     let k p =
 393       match Ast.unwrap p with
 394         Ast.DParam(id) -> ident id
 395       | Ast.DPComma(comma) -> string_mcode comma
 396       | Ast.DPdots(d) -> string_mcode d
 397       | Ast.DPcircles(c) -> string_mcode c
 398       | Ast.OptDParam(dp) -> define_param dp
 399       | Ast.UniqueDParam(dp) -> define_param dp in
 400     k p
 401
 402   (* discard the result, because the statement is assumed to be already
 403      represented elsewhere in the code *)
 404   and process_bef_aft s =
 405     match Ast.get_dots_bef_aft s with
 406       Ast.NoDots -> ()
 407     | Ast.DroppingBetweenDots(stm,ind) -> let _ = statement stm in ()
 408     | Ast.AddingBetweenDots(stm,ind) -> let _ = statement stm in ()
 409
 410   and statement s =
 411     process_bef_aft s;
 412     let k s =
 413       match Ast.unwrap s with
 414         Ast.Seq(lbrace,decls,body,rbrace) ->
 415           multibind [rule_elem lbrace; statement_dots decls;
 416                       statement_dots body; rule_elem rbrace]
 417       | Ast.IfThen(header,branch,_) ->
 418           multibind [rule_elem header; statement branch]
 419       | Ast.IfThenElse(header,branch1,els,branch2,_) ->
 420           multibind [rule_elem header; statement branch1; rule_elem els;
 421                       statement branch2]
 422       | Ast.While(header,body,_) ->
 423           multibind [rule_elem header; statement body]
 424       | Ast.Do(header,body,tail) ->
 425           multibind [rule_elem header; statement body; rule_elem tail]
 426       | Ast.For(header,body,_) -> multibind [rule_elem header; statement body]
 427       | Ast.Iterator(header,body,_) ->
 428           multibind [rule_elem header; statement body]
 429       | Ast.Switch(header,lb,cases,rb) ->
 430           multibind [rule_elem header;rule_elem lb;
 431                       multibind (List.map case_line cases);
 432                       rule_elem rb]
 433       | Ast.Atomic(re) -> rule_elem re
 434       | Ast.Disj(stmt_dots_list) ->
 435           multibind (List.map statement_dots stmt_dots_list)
 436       | Ast.Nest(stmt_dots,whn,_,_,_) ->
 437           bind (statement_dots stmt_dots)
 438             (multibind (List.map (whencode statement_dots statement) whn))
 439       | Ast.FunDecl(header,lbrace,decls,body,rbrace) ->
 440           multibind [rule_elem header; rule_elem lbrace;
 441                       statement_dots decls; statement_dots body;
 442                       rule_elem rbrace]
 443       | Ast.Define(header,body) ->
 444           bind (rule_elem header) (statement_dots body)
 445       | Ast.Dots(d,whn,_,_) | Ast.Circles(d,whn,_,_) | Ast.Stars(d,whn,_,_) ->
 446           bind (string_mcode d)
 447             (multibind (List.map (whencode statement_dots statement) whn))
 448       | Ast.OptStm(stmt) | Ast.UniqueStm(stmt) ->
 449           statement stmt in
 450     stmtfn all_functions k s
 451
 452   and fninfo = function
 453       Ast.FStorage(stg) -> storage_mcode stg
 454     | Ast.FType(ty) -> fullType ty
 455     | Ast.FInline(inline) -> string_mcode inline
 456     | Ast.FAttr(attr) -> string_mcode attr
 457
 458   and whencode notfn alwaysfn = function
 459       Ast.WhenNot a -> notfn a
 460     | Ast.WhenAlways a -> alwaysfn a
 461     | Ast.WhenModifier(_) -> option_default
 462     | Ast.WhenNotTrue(e) -> rule_elem e
 463     | Ast.WhenNotFalse(e) -> rule_elem e
 464
 465   and case_line c =
 466     let k c =
 467       match Ast.unwrap c with
 468         Ast.CaseLine(header,code) ->
 469           bind (rule_elem header) (statement_dots code)
 470       | Ast.OptCase(case) -> case_line case in
 471     casefn all_functions k c
 472
 473   and top_level t =
 474     let k t =
 475       match Ast.unwrap t with
 476         Ast.FILEINFO(old_file,new_file) ->
 477           bind (string_mcode old_file) (string_mcode new_file)
 478       | Ast.DECL(stmt) -> statement stmt
 479       | Ast.CODE(stmt_dots) -> statement_dots stmt_dots
 480       | Ast.ERRORWORDS(exps) -> multibind (List.map expression exps) in
 481     topfn all_functions k t
 482
 483   and anything a =
 484     let k = function
 485         (*in many cases below, the thing is not even mcode, so we do nothing*)
 486         Ast.FullTypeTag(ft) -> fullType ft
 487       | Ast.BaseTypeTag(bt) -> option_default
 488       | Ast.StructUnionTag(su) -> option_default
 489       | Ast.SignTag(sgn) -> option_default
 490       | Ast.IdentTag(id) -> ident id
 491       | Ast.ExpressionTag(exp) -> expression exp
 492       | Ast.ConstantTag(cst) -> option_default
 493       | Ast.UnaryOpTag(unop) -> option_default
 494       | Ast.AssignOpTag(asgnop) -> option_default
 495       | Ast.FixOpTag(fixop) -> option_default
 496       | Ast.BinaryOpTag(binop) -> option_default
 497       | Ast.ArithOpTag(arithop) -> option_default
 498       | Ast.LogicalOpTag(logop) -> option_default
 499       | Ast.DeclarationTag(decl) -> declaration decl
 500       | Ast.InitTag(ini) -> initialiser ini
 501       | Ast.StorageTag(stg) -> option_default
 502       | Ast.IncFileTag(stg) -> option_default
 503       | Ast.Rule_elemTag(rule) -> rule_elem rule
 504       | Ast.StatementTag(rule) -> statement rule
 505       | Ast.CaseLineTag(case) -> case_line case
 506       | Ast.ConstVolTag(cv) -> option_default
 507       | Ast.Token(tok,info) -> option_default
 508       | Ast.Pragma(str) -> option_default
 509       | Ast.Code(cd) -> top_level cd
 510       | Ast.ExprDotsTag(ed) -> expression_dots ed
 511       | Ast.ParamDotsTag(pd) -> parameter_dots pd
 512       | Ast.StmtDotsTag(sd) -> statement_dots sd
 513       | Ast.DeclDotsTag(sd) -> declaration_dots sd
 514       | Ast.TypeCTag(ty) -> typeC ty
 515       | Ast.ParamTag(param) -> parameterTypeDef param
 516       | Ast.SgrepStartTag(tok) -> option_default
 517       | Ast.SgrepEndTag(tok) -> option_default in
 518     anyfn all_functions k a
 519
 520   and all_functions =
 521     {combiner_ident = ident;
 522       combiner_expression = expression;
 523       combiner_fullType = fullType;
 524       combiner_typeC = typeC;
 525       combiner_declaration = declaration;
 526       combiner_initialiser = initialiser;
 527       combiner_parameter = parameterTypeDef;
 528       combiner_parameter_list = parameter_dots;
 529       combiner_rule_elem = rule_elem;
 530       combiner_statement = statement;
 531       combiner_case_line = case_line;
 532       combiner_top_level = top_level;
 533       combiner_anything = anything;
 534       combiner_expression_dots = expression_dots;
 535       combiner_statement_dots = statement_dots;
 536       combiner_declaration_dots = declaration_dots} in
 537   all_functions
 538
 539 (* ---------------------------------------------------------------------- *)
 540
 541 type 'a inout = 'a -> 'a (* for specifying the type of rebuilder *)
 542
 543 type rebuilder =
 544     {rebuilder_ident : Ast.ident inout;
 545       rebuilder_expression : Ast.expression inout;
 546       rebuilder_fullType : Ast.fullType inout;
 547       rebuilder_typeC : Ast.typeC inout;
 548       rebuilder_declaration : Ast.declaration inout;
 549       rebuilder_initialiser : Ast.initialiser inout;
 550       rebuilder_parameter : Ast.parameterTypeDef inout;
 551       rebuilder_parameter_list : Ast.parameter_list inout;
 552       rebuilder_statement : Ast.statement inout;
 553       rebuilder_case_line : Ast.case_line inout;
 554       rebuilder_rule_elem : Ast.rule_elem inout;
 555       rebuilder_top_level : Ast.top_level inout;
 556       rebuilder_expression_dots : Ast.expression Ast.dots inout;
 557       rebuilder_statement_dots : Ast.statement Ast.dots inout;
 558       rebuilder_declaration_dots : Ast.declaration Ast.dots inout;
 559       rebuilder_define_param_dots : Ast.define_param Ast.dots inout;
 560       rebuilder_define_param : Ast.define_param inout;
 561       rebuilder_define_parameters : Ast.define_parameters inout;
 562       rebuilder_anything : Ast.anything inout}
 563
 564 type 'mc rmcode = 'mc Ast.mcode inout
 565 type 'cd rcode = rebuilder -> ('cd inout) -> 'cd inout
 566
 567
 568 let rebuilder
 569     meta_mcode string_mcode const_mcode assign_mcode fix_mcode unary_mcode
 570     binary_mcode cv_mcode sign_mcode struct_mcode storage_mcode
 571     inc_file_mcode
 572     expdotsfn paramdotsfn stmtdotsfn decldotsfn
 573     identfn exprfn ftfn tyfn initfn paramfn declfn rulefn stmtfn casefn
 574     topfn anyfn =
 575   let get_option f = function
 576       Some x -> Some (f x)
 577     | None -> None in
 578   let rec expression_dots d =
 579     let k d =
 580       Ast.rewrap d
 581         (match Ast.unwrap d with
 582           Ast.DOTS(l) -> Ast.DOTS(List.map expression l)
 583         | Ast.CIRCLES(l) -> Ast.CIRCLES(List.map expression l)
 584         | Ast.STARS(l) -> Ast.STARS(List.map expression l)) in
 585     expdotsfn all_functions k d
 586
 587   and parameter_dots d =
 588     let k d =
 589       Ast.rewrap d
 590         (match Ast.unwrap d with
 591           Ast.DOTS(l) -> Ast.DOTS(List.map parameterTypeDef l)
 592         | Ast.CIRCLES(l) -> Ast.CIRCLES(List.map parameterTypeDef l)
 593         | Ast.STARS(l) -> Ast.STARS(List.map parameterTypeDef l)) in
 594     paramdotsfn all_functions k d
 595
 596   and statement_dots d =
 597     let k d =
 598       Ast.rewrap d
 599         (match Ast.unwrap d with
 600           Ast.DOTS(l) -> Ast.DOTS(List.map statement l)
 601         | Ast.CIRCLES(l) -> Ast.CIRCLES(List.map statement l)
 602         | Ast.STARS(l) -> Ast.STARS(List.map statement l)) in
 603     stmtdotsfn all_functions k d
 604
 605   and declaration_dots d =
 606     let k d =
 607       Ast.rewrap d
 608         (match Ast.unwrap d with
 609           Ast.DOTS(l) -> Ast.DOTS(List.map declaration l)
 610         | Ast.CIRCLES(l) -> Ast.CIRCLES(List.map declaration l)
 611         | Ast.STARS(l) -> Ast.STARS(List.map declaration l)) in
 612     decldotsfn all_functions k d
 613
 614   and ident i =
 615     let k i =
 616       Ast.rewrap i
 617         (match Ast.unwrap i with
 618           Ast.Id(name) -> Ast.Id(string_mcode name)
 619         | Ast.MetaId(name,constraints,keep,inherited) ->
 620             Ast.MetaId(meta_mcode name,constraints,keep,inherited)
 621         | Ast.MetaFunc(name,constraints,keep,inherited) ->
 622             Ast.MetaFunc(meta_mcode name,constraints,keep,inherited)
 623         | Ast.MetaLocalFunc(name,constraints,keep,inherited) ->
 624             Ast.MetaLocalFunc(meta_mcode name,constraints,keep,inherited)
 625         | Ast.OptIdent(id) -> Ast.OptIdent(ident id)
 626         | Ast.UniqueIdent(id) -> Ast.UniqueIdent(ident id)) in
 627     identfn all_functions k i
 628
 629   and expression e =
 630     let k e =
 631       Ast.rewrap e
 632         (match Ast.unwrap e with
 633           Ast.Ident(id) -> Ast.Ident(ident id)
 634         | Ast.Constant(const) -> Ast.Constant(const_mcode const)
 635         | Ast.FunCall(fn,lp,args,rp) ->
 636             Ast.FunCall(expression fn, string_mcode lp, expression_dots args,
 637                         string_mcode rp)
 638         | Ast.Assignment(left,op,right,simple) ->
 639             Ast.Assignment(expression left, assign_mcode op, expression right,
 640                            simple)
 641         | Ast.CondExpr(exp1,why,exp2,colon,exp3) ->
 642             Ast.CondExpr(expression exp1, string_mcode why,
 643                          get_option expression exp2, string_mcode colon,
 644                          expression exp3)
 645         | Ast.Postfix(exp,op) -> Ast.Postfix(expression exp,fix_mcode op)
 646         | Ast.Infix(exp,op) -> Ast.Infix(expression exp,fix_mcode op)
 647         | Ast.Unary(exp,op) -> Ast.Unary(expression exp,unary_mcode op)
 648         | Ast.Binary(left,op,right) ->
 649             Ast.Binary(expression left, binary_mcode op, expression right)
 650         | Ast.Nested(left,op,right) ->
 651             Ast.Nested(expression left, binary_mcode op, expression right)
 652         | Ast.Paren(lp,exp,rp) ->
 653             Ast.Paren(string_mcode lp, expression exp, string_mcode rp)
 654         | Ast.ArrayAccess(exp1,lb,exp2,rb) ->
 655             Ast.ArrayAccess(expression exp1, string_mcode lb, expression exp2,
 656                             string_mcode rb)
 657         | Ast.RecordAccess(exp,pt,field) ->
 658             Ast.RecordAccess(expression exp, string_mcode pt, ident field)
 659         | Ast.RecordPtAccess(exp,ar,field) ->
 660             Ast.RecordPtAccess(expression exp, string_mcode ar, ident field)
 661         | Ast.Cast(lp,ty,rp,exp) ->
 662             Ast.Cast(string_mcode lp, fullType ty, string_mcode rp,
 663                      expression exp)
 664         | Ast.SizeOfExpr(szf,exp) ->
 665             Ast.SizeOfExpr(string_mcode szf, expression exp)
 666         | Ast.SizeOfType(szf,lp,ty,rp) ->
 667             Ast.SizeOfType(string_mcode szf,string_mcode lp, fullType ty,
 668                            string_mcode rp)
 669         | Ast.TypeExp(ty) -> Ast.TypeExp(fullType ty)
 670         | Ast.MetaErr(name,constraints,keep,inherited) ->
 671             Ast.MetaErr(meta_mcode name,constraints,keep,inherited)
 672         | Ast.MetaExpr(name,constraints,keep,ty,form,inherited) ->
 673             Ast.MetaExpr(meta_mcode name,constraints,keep,ty,form,inherited)
 674         | Ast.MetaExprList(name,lenname_inh,keep,inherited) ->
 675             Ast.MetaExprList(meta_mcode name,lenname_inh,keep,inherited)
 676         | Ast.EComma(cm) -> Ast.EComma(string_mcode cm)
 677         | Ast.DisjExpr(exp_list) -> Ast.DisjExpr(List.map expression exp_list)
 678         | Ast.NestExpr(expr_dots,whencode,multi) ->
 679             Ast.NestExpr(expression_dots expr_dots,
 680                          get_option expression whencode,multi)
 681         | Ast.Edots(dots,whencode) ->
 682             Ast.Edots(string_mcode dots,get_option expression whencode)
 683         | Ast.Ecircles(dots,whencode) ->
 684             Ast.Ecircles(string_mcode dots,get_option expression whencode)
 685         | Ast.Estars(dots,whencode) ->
 686             Ast.Estars(string_mcode dots,get_option expression whencode)
 687         | Ast.OptExp(exp) -> Ast.OptExp(expression exp)
 688         | Ast.UniqueExp(exp) -> Ast.UniqueExp(expression exp)) in
 689     exprfn all_functions k e
 690
 691   and fullType ft =
 692     let k ft =
 693       Ast.rewrap ft
 694         (match Ast.unwrap ft with
 695           Ast.Type(cv,ty) -> Ast.Type (get_option cv_mcode cv, typeC ty)
 696         | Ast.DisjType(types) -> Ast.DisjType(List.map fullType types)
 697         | Ast.OptType(ty) -> Ast.OptType(fullType ty)
 698         | Ast.UniqueType(ty) -> Ast.UniqueType(fullType ty)) in
 699     ftfn all_functions k ft
 700
 701   and typeC ty =
 702     let k ty =
 703       Ast.rewrap ty
 704         (match Ast.unwrap ty with
 705           Ast.BaseType(ty,strings) ->
 706             Ast.BaseType (ty, List.map string_mcode strings)
 707         | Ast.SignedT(sgn,ty) ->
 708             Ast.SignedT(sign_mcode sgn,get_option typeC ty)
 709         | Ast.Pointer(ty,star) ->
 710             Ast.Pointer (fullType ty, string_mcode star)
 711         | Ast.FunctionPointer(ty,lp1,star,rp1,lp2,params,rp2) ->
 712             Ast.FunctionPointer(fullType ty,string_mcode lp1,string_mcode star,
 713                                 string_mcode rp1,string_mcode lp2,
 714                                 parameter_dots params,
 715                                 string_mcode rp2)
 716         | Ast.FunctionType(allminus,ty,lp,params,rp) ->
 717             Ast.FunctionType(allminus,get_option fullType ty,string_mcode lp,
 718                              parameter_dots params,string_mcode rp)
 719         | Ast.Array(ty,lb,size,rb) ->
 720             Ast.Array(fullType ty, string_mcode lb,
 721                       get_option expression size, string_mcode rb)
 722         | Ast.EnumName(kind,name) ->
 723             Ast.EnumName(string_mcode kind, ident name)
 724         | Ast.StructUnionName(kind,name) ->
 725             Ast.StructUnionName (struct_mcode kind, get_option ident name)
 726         | Ast.StructUnionDef(ty,lb,decls,rb) ->
 727             Ast.StructUnionDef (fullType ty,
 728                                 string_mcode lb, declaration_dots decls,
 729                                 string_mcode rb)
 730         | Ast.TypeName(name) -> Ast.TypeName(string_mcode name)
 731         | Ast.MetaType(name,keep,inherited) ->
 732             Ast.MetaType(meta_mcode name,keep,inherited)) in
 733     tyfn all_functions k ty
 734
 735   and declaration d =
 736     let k d =
 737       Ast.rewrap d
 738         (match Ast.unwrap d with
 739           Ast.Init(stg,ty,id,eq,ini,sem) ->
 740             Ast.Init(get_option storage_mcode stg, fullType ty, ident id,
 741                      string_mcode eq, initialiser ini, string_mcode sem)
 742         | Ast.UnInit(stg,ty,id,sem) ->
 743             Ast.UnInit(get_option storage_mcode stg, fullType ty, ident id,
 744                        string_mcode sem)
 745         | Ast.MacroDecl(name,lp,args,rp,sem) ->
 746             Ast.MacroDecl(ident name, string_mcode lp, expression_dots args,
 747                           string_mcode rp,string_mcode sem)
 748         | Ast.TyDecl(ty,sem) -> Ast.TyDecl(fullType ty, string_mcode sem)
 749         | Ast.Typedef(stg,ty,id,sem) ->
 750             Ast.Typedef(string_mcode stg, fullType ty, typeC id,
 751                         string_mcode sem)
 752         | Ast.DisjDecl(decls) -> Ast.DisjDecl(List.map declaration decls)
 753         | Ast.Ddots(dots,whencode) ->
 754             Ast.Ddots(string_mcode dots, get_option declaration whencode)
 755         | Ast.MetaDecl(name,keep,inherited) ->
 756             Ast.MetaDecl(meta_mcode name,keep,inherited)
 757         | Ast.OptDecl(decl) -> Ast.OptDecl(declaration decl)
 758         | Ast.UniqueDecl(decl) -> Ast.UniqueDecl(declaration decl)) in
 759     declfn all_functions k d
 760
 761   and initialiser i =
 762     let k i =
 763       Ast.rewrap i
 764         (match Ast.unwrap i with
 765           Ast.MetaInit(name,keep,inherited) ->
 766             Ast.MetaInit(meta_mcode name,keep,inherited)
 767         | Ast.InitExpr(exp) -> Ast.InitExpr(expression exp)
 768         | Ast.InitList(lb,initlist,rb,whencode) ->
 769             Ast.InitList(string_mcode lb, List.map initialiser initlist,
 770                          string_mcode rb, List.map initialiser whencode)
 771         | Ast.InitGccName(name,eq,ini) ->
 772             Ast.InitGccName(ident name, string_mcode eq, initialiser ini)
 773         | Ast.InitGccExt(designators,eq,ini) ->
 774             Ast.InitGccExt
 775               (List.map designator designators, string_mcode eq,
 776                initialiser ini)
 777         | Ast.IComma(cm) -> Ast.IComma(string_mcode cm)
 778         | Ast.OptIni(i) -> Ast.OptIni(initialiser i)
 779         | Ast.UniqueIni(i) -> Ast.UniqueIni(initialiser i)) in
 780     initfn all_functions k i
 781
 782   and designator = function
 783       Ast.DesignatorField(dot,id) ->
 784         Ast.DesignatorField(string_mcode dot,ident id)
 785     | Ast.DesignatorIndex(lb,exp,rb) ->
 786         Ast.DesignatorIndex(string_mcode lb,expression exp,string_mcode rb)
 787     | Ast.DesignatorRange(lb,min,dots,max,rb) ->
 788         Ast.DesignatorRange(string_mcode lb,expression min,string_mcode dots,
 789                              expression max,string_mcode rb)
 790
 791   and parameterTypeDef p =
 792     let k p =
 793       Ast.rewrap p
 794         (match Ast.unwrap p with
 795           Ast.VoidParam(ty) -> Ast.VoidParam(fullType ty)
 796         | Ast.Param(ty,id) -> Ast.Param(fullType ty, get_option ident id)
 797         | Ast.MetaParam(name,keep,inherited) ->
 798             Ast.MetaParam(meta_mcode name,keep,inherited)
 799         | Ast.MetaParamList(name,lenname_inh,keep,inherited) ->
 800             Ast.MetaParamList(meta_mcode name,lenname_inh,keep,inherited)
 801         | Ast.PComma(cm) -> Ast.PComma(string_mcode cm)
 802         | Ast.Pdots(dots) -> Ast.Pdots(string_mcode dots)
 803         | Ast.Pcircles(dots) -> Ast.Pcircles(string_mcode dots)
 804         | Ast.OptParam(param) -> Ast.OptParam(parameterTypeDef param)
 805         | Ast.UniqueParam(param) -> Ast.UniqueParam(parameterTypeDef param)) in
 806     paramfn all_functions k p
 807
 808   and rule_elem re =
 809     let k re =
 810       Ast.rewrap re
 811         (match Ast.unwrap re with
 812           Ast.FunHeader(bef,allminus,fi,name,lp,params,rp) ->
 813             Ast.FunHeader(bef,allminus,List.map fninfo fi,ident name,
 814                           string_mcode lp, parameter_dots params,
 815                           string_mcode rp)
 816         | Ast.Decl(bef,allminus,decl) ->
 817             Ast.Decl(bef,allminus,declaration decl)
 818         | Ast.SeqStart(brace) -> Ast.SeqStart(string_mcode brace)
 819         | Ast.SeqEnd(brace) -> Ast.SeqEnd(string_mcode brace)
 820         | Ast.ExprStatement(exp,sem) ->
 821             Ast.ExprStatement (expression exp, string_mcode sem)
 822         | Ast.IfHeader(iff,lp,exp,rp) ->
 823             Ast.IfHeader(string_mcode iff, string_mcode lp, expression exp,
 824               string_mcode rp)
 825         | Ast.Else(els) -> Ast.Else(string_mcode els)
 826         | Ast.WhileHeader(whl,lp,exp,rp) ->
 827             Ast.WhileHeader(string_mcode whl, string_mcode lp, expression exp,
 828                             string_mcode rp)
 829         | Ast.DoHeader(d) -> Ast.DoHeader(string_mcode d)
 830         | Ast.WhileTail(whl,lp,exp,rp,sem) ->
 831             Ast.WhileTail(string_mcode whl, string_mcode lp, expression exp,
 832                           string_mcode rp, string_mcode sem)
 833         | Ast.ForHeader(fr,lp,e1,sem1,e2,sem2,e3,rp) ->
 834             Ast.ForHeader(string_mcode fr, string_mcode lp,
 835                           get_option expression e1, string_mcode sem1,
 836                           get_option expression e2, string_mcode sem2,
 837                           get_option expression e3, string_mcode rp)
 838         | Ast.IteratorHeader(whl,lp,args,rp) ->
 839             Ast.IteratorHeader(ident whl, string_mcode lp,
 840                                expression_dots args, string_mcode rp)
 841         | Ast.SwitchHeader(switch,lp,exp,rp) ->
 842             Ast.SwitchHeader(string_mcode switch, string_mcode lp,
 843                              expression exp, string_mcode rp)
 844         | Ast.Break(br,sem) ->
 845             Ast.Break(string_mcode br, string_mcode sem)
 846         | Ast.Continue(cont,sem) ->
 847             Ast.Continue(string_mcode cont, string_mcode sem)
 848         | Ast.Label(l,dd) -> Ast.Label(ident l, string_mcode dd)
 849         | Ast.Goto(goto,l,sem) ->
 850             Ast.Goto(string_mcode goto,ident l,string_mcode sem)
 851         | Ast.Return(ret,sem) ->
 852             Ast.Return(string_mcode ret, string_mcode sem)
 853         | Ast.ReturnExpr(ret,exp,sem) ->
 854             Ast.ReturnExpr(string_mcode ret, expression exp, string_mcode sem)
 855         | Ast.MetaStmt(name,keep,seqible,inherited) ->
 856             Ast.MetaStmt(meta_mcode name,keep,seqible,inherited)
 857         | Ast.MetaStmtList(name,keep,inherited) ->
 858             Ast.MetaStmtList(meta_mcode name,keep,inherited)
 859         | Ast.MetaRuleElem(name,keep,inherited) ->
 860             Ast.MetaRuleElem(meta_mcode name,keep,inherited)
 861         | Ast.Exp(exp) -> Ast.Exp(expression exp)
 862         | Ast.TopExp(exp) -> Ast.TopExp(expression exp)
 863         | Ast.Ty(ty) -> Ast.Ty(fullType ty)
 864         | Ast.TopInit(init) -> Ast.TopInit(initialiser init)
 865         | Ast.Include(inc,name) ->
 866             Ast.Include(string_mcode inc,inc_file_mcode name)
 867         | Ast.DefineHeader(def,id,params) ->
 868             Ast.DefineHeader(string_mcode def,ident id,
 869                              define_parameters params)
 870         | Ast.Default(def,colon) ->
 871             Ast.Default(string_mcode def,string_mcode colon)
 872         | Ast.Case(case,exp,colon) ->
 873             Ast.Case(string_mcode case,expression exp,string_mcode colon)
 874         | Ast.DisjRuleElem(res) -> Ast.DisjRuleElem(List.map rule_elem res)) in
 875     rulefn all_functions k re
 876
 877   (* not parameterizable for now... *)
 878   and define_parameters p =
 879     let k p =
 880       Ast.rewrap p
 881         (match Ast.unwrap p with
 882           Ast.NoParams -> Ast.NoParams
 883         | Ast.DParams(lp,params,rp) ->
 884             Ast.DParams(string_mcode lp,define_param_dots params,
 885                         string_mcode rp)) in
 886     k p
 887
 888   and define_param_dots d =
 889     let k d =
 890       Ast.rewrap d
 891         (match Ast.unwrap d with
 892           Ast.DOTS(l) -> Ast.DOTS(List.map define_param l)
 893         | Ast.CIRCLES(l) -> Ast.CIRCLES(List.map define_param l)
 894         | Ast.STARS(l) -> Ast.STARS(List.map define_param l)) in
 895     k d
 896
 897   and define_param p =
 898     let k p =
 899       Ast.rewrap p
 900         (match Ast.unwrap p with
 901           Ast.DParam(id) -> Ast.DParam(ident id)
 902         | Ast.DPComma(comma) -> Ast.DPComma(string_mcode comma)
 903         | Ast.DPdots(d) -> Ast.DPdots(string_mcode d)
 904         | Ast.DPcircles(c) -> Ast.DPcircles(string_mcode c)
 905         | Ast.OptDParam(dp) -> Ast.OptDParam(define_param dp)
 906         | Ast.UniqueDParam(dp) -> Ast.UniqueDParam(define_param dp)) in
 907     k p
 908
 909   and process_bef_aft s =
 910     Ast.set_dots_bef_aft
 911       (match Ast.get_dots_bef_aft s with
 912         Ast.NoDots -> Ast.NoDots
 913       | Ast.DroppingBetweenDots(stm,ind) ->
 914           Ast.DroppingBetweenDots(statement stm,ind)
 915       | Ast.AddingBetweenDots(stm,ind) ->
 916           Ast.AddingBetweenDots(statement stm,ind))
 917       s
 918
 919   and statement s =
 920     let k s =
 921       Ast.rewrap s
 922         (match Ast.unwrap s with
 923           Ast.Seq(lbrace,decls,body,rbrace) ->
 924             Ast.Seq(rule_elem lbrace, statement_dots decls,
 925                     statement_dots body, rule_elem rbrace)
 926         | Ast.IfThen(header,branch,aft) ->
 927             Ast.IfThen(rule_elem header, statement branch,aft)
 928         | Ast.IfThenElse(header,branch1,els,branch2,aft) ->
 929             Ast.IfThenElse(rule_elem header, statement branch1, rule_elem els,
 930                            statement branch2, aft)
 931         | Ast.While(header,body,aft) ->
 932             Ast.While(rule_elem header, statement body, aft)
 933         | Ast.Do(header,body,tail) ->
 934             Ast.Do(rule_elem header, statement body, rule_elem tail)
 935         | Ast.For(header,body,aft) ->
 936             Ast.For(rule_elem header, statement body, aft)
 937         | Ast.Iterator(header,body,aft) ->
 938             Ast.Iterator(rule_elem header, statement body, aft)
 939         | Ast.Switch(header,lb,cases,rb) ->
 940             Ast.Switch(rule_elem header,rule_elem lb,
 941                        List.map case_line cases,rule_elem rb)
 942         | Ast.Atomic(re) -> Ast.Atomic(rule_elem re)
 943         | Ast.Disj(stmt_dots_list) ->
 944             Ast.Disj (List.map statement_dots stmt_dots_list)
 945         | Ast.Nest(stmt_dots,whn,multi,bef,aft) ->
 946             Ast.Nest(statement_dots stmt_dots,
 947                      List.map (whencode statement_dots statement) whn,
 948                      multi,bef,aft)
 949         | Ast.FunDecl(header,lbrace,decls,body,rbrace) ->
 950             Ast.FunDecl(rule_elem header,rule_elem lbrace,
 951                         statement_dots decls,
 952                         statement_dots body, rule_elem rbrace)
 953         | Ast.Define(header,body) ->
 954             Ast.Define(rule_elem header,statement_dots body)
 955         | Ast.Dots(d,whn,bef,aft) ->
 956             Ast.Dots(string_mcode d,
 957                      List.map (whencode statement_dots statement) whn,bef,aft)
 958         | Ast.Circles(d,whn,bef,aft) ->
 959             Ast.Circles(string_mcode d,
 960                         List.map (whencode statement_dots statement) whn,
 961                         bef,aft)
 962         | Ast.Stars(d,whn,bef,aft) ->
 963             Ast.Stars(string_mcode d,
 964                       List.map (whencode statement_dots statement) whn,bef,aft)
 965         | Ast.OptStm(stmt) -> Ast.OptStm(statement stmt)
 966         | Ast.UniqueStm(stmt) -> Ast.UniqueStm(statement stmt)) in
 967     let s = stmtfn all_functions k s in
 968     (* better to do this after, in case there is an equality test on the whole
 969        statement, eg in free_vars.  equality test would require that this
 970        subterm not already be changed *)
 971     process_bef_aft s
 972
 973   and fninfo = function
 974       Ast.FStorage(stg) -> Ast.FStorage(storage_mcode stg)
 975     | Ast.FType(ty) -> Ast.FType(fullType ty)
 976     | Ast.FInline(inline) -> Ast.FInline(string_mcode inline)
 977     | Ast.FAttr(attr) -> Ast.FAttr(string_mcode attr)
 978
 979   and whencode notfn alwaysfn = function
 980       Ast.WhenNot a -> Ast.WhenNot (notfn a)
 981     | Ast.WhenAlways a -> Ast.WhenAlways (alwaysfn a)
 982     | Ast.WhenModifier(x)    -> Ast.WhenModifier(x)
 983     | Ast.WhenNotTrue(e) -> Ast.WhenNotTrue(rule_elem e)
 984     | Ast.WhenNotFalse(e) -> Ast.WhenNotFalse(rule_elem e)
 985
 986   and case_line c =
 987     let k c =
 988       Ast.rewrap c
 989         (match Ast.unwrap c with
 990           Ast.CaseLine(header,code) ->
 991             Ast.CaseLine(rule_elem header,statement_dots code)
 992         | Ast.OptCase(case) -> Ast.OptCase(case_line case)) in
 993     casefn all_functions k c
 994
 995   and top_level t =
 996     let k t =
 997       Ast.rewrap t
 998         (match Ast.unwrap t with
 999           Ast.FILEINFO(old_file,new_file) ->
1000             Ast.FILEINFO (string_mcode old_file, string_mcode new_file)
1001         | Ast.DECL(stmt) -> Ast.DECL(statement stmt)
1002         | Ast.CODE(stmt_dots) -> Ast.CODE(statement_dots stmt_dots)
1003         | Ast.ERRORWORDS(exps) -> Ast.ERRORWORDS (List.map expression exps)) in
1004     topfn all_functions k t
1005
1006   and anything a =
1007     let k = function
1008         (*in many cases below, the thing is not even mcode, so we do nothing*)
1009         Ast.FullTypeTag(ft) -> Ast.FullTypeTag(fullType ft)
1010       | Ast.BaseTypeTag(bt) as x -> x
1011       | Ast.StructUnionTag(su) as x -> x
1012       | Ast.SignTag(sgn) as x -> x
1013       | Ast.IdentTag(id) -> Ast.IdentTag(ident id)
1014       | Ast.ExpressionTag(exp) -> Ast.ExpressionTag(expression exp)
1015       | Ast.ConstantTag(cst) as x -> x
1016       | Ast.UnaryOpTag(unop) as x -> x
1017       | Ast.AssignOpTag(asgnop) as x -> x
1018       | Ast.FixOpTag(fixop) as x -> x
1019       | Ast.BinaryOpTag(binop) as x -> x
1020       | Ast.ArithOpTag(arithop) as x -> x
1021       | Ast.LogicalOpTag(logop) as x -> x
1022       | Ast.InitTag(decl) -> Ast.InitTag(initialiser decl)
1023       | Ast.DeclarationTag(decl) -> Ast.DeclarationTag(declaration decl)
1024       | Ast.StorageTag(stg) as x -> x
1025       | Ast.IncFileTag(stg) as x -> x
1026       | Ast.Rule_elemTag(rule) -> Ast.Rule_elemTag(rule_elem rule)
1027       | Ast.StatementTag(rule) -> Ast.StatementTag(statement rule)
1028       | Ast.CaseLineTag(case) -> Ast.CaseLineTag(case_line case)
1029       | Ast.ConstVolTag(cv) as x -> x
1030       | Ast.Token(tok,info) as x -> x
1031       | Ast.Pragma(str) as x -> x
1032       | Ast.Code(cd) -> Ast.Code(top_level cd)
1033       | Ast.ExprDotsTag(ed) -> Ast.ExprDotsTag(expression_dots ed)
1034       | Ast.ParamDotsTag(pd) -> Ast.ParamDotsTag(parameter_dots pd)
1035       | Ast.StmtDotsTag(sd) -> Ast.StmtDotsTag(statement_dots sd)
1036       | Ast.DeclDotsTag(sd) -> Ast.DeclDotsTag(declaration_dots sd)
1037       | Ast.TypeCTag(ty) -> Ast.TypeCTag(typeC ty)
1038       | Ast.ParamTag(param) -> Ast.ParamTag(parameterTypeDef param)
1039       | Ast.SgrepStartTag(tok) as x -> x
1040       | Ast.SgrepEndTag(tok) as x -> x in
1041     anyfn all_functions k a
1042
1043   and all_functions =
1044     {rebuilder_ident = ident;
1045       rebuilder_expression = expression;
1046       rebuilder_fullType= fullType;
1047       rebuilder_typeC = typeC;
1048       rebuilder_declaration = declaration;
1049       rebuilder_initialiser = initialiser;
1050       rebuilder_parameter = parameterTypeDef;
1051       rebuilder_parameter_list = parameter_dots;
1052       rebuilder_rule_elem = rule_elem;
1053       rebuilder_statement = statement;
1054       rebuilder_case_line = case_line;
1055       rebuilder_top_level = top_level;
1056       rebuilder_expression_dots = expression_dots;
1057       rebuilder_statement_dots = statement_dots;
1058       rebuilder_declaration_dots = declaration_dots;
1059       rebuilder_define_param_dots = define_param_dots;
1060       rebuilder_define_param = define_param;
1061       rebuilder_define_parameters = define_parameters;
1062       rebuilder_anything = anything} in
1063   all_functions
1064