parsing_cocci/visitor_ast.ml

   1 (*
   2  * Copyright 2012, INRIA
   3  * Julia Lawall, Gilles Muller
   4  * Copyright 2010-2011, INRIA, University of Copenhagen
   5  * Julia Lawall, Rene Rydhof Hansen, Gilles Muller, Nicolas Palix
   6  * Copyright 2005-2009, Ecole des Mines de Nantes, University of Copenhagen
   7  * Yoann Padioleau, Julia Lawall, Rene Rydhof Hansen, Henrik Stuart, Gilles Muller, Nicolas Palix
   8  * This file is part of Coccinelle.
   9  *
  10  * Coccinelle is free software: you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation, according to version 2 of the License.
  13  *
  14  * Coccinelle is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with Coccinelle.  If not, see <http://www.gnu.org/licenses/>.
  21  *
  22  * The authors reserve the right to distribute this or future versions of
  23  * Coccinelle under other licenses.
  24  *)
  25
  26
  27 module Ast0 = Ast0_cocci
  28 module Ast = Ast_cocci
  29
  30 (* --------------------------------------------------------------------- *)
  31 (* Generic traversal: combiner *)
  32 (* parameters:
  33    combining function
  34    treatment of: mcode, identifiers, expressions, fullTypes, types,
  35    declarations, statements, toplevels
  36    default value for options *)
  37
  38 type 'a combiner =
  39     {combiner_ident : Ast.ident -> 'a;
  40      combiner_expression : Ast.expression -> 'a;
  41      combiner_fullType : Ast.fullType -> 'a;
  42      combiner_typeC : Ast.typeC -> 'a;
  43      combiner_declaration : Ast.declaration -> 'a;
  44      combiner_initialiser : Ast.initialiser -> 'a;
  45      combiner_parameter : Ast.parameterTypeDef -> 'a;
  46      combiner_parameter_list : Ast.parameter_list -> 'a;
  47      combiner_rule_elem : Ast.rule_elem -> 'a;
  48      combiner_statement : Ast.statement -> 'a;
  49      combiner_case_line : Ast.case_line -> 'a;
  50      combiner_top_level : Ast.top_level -> 'a;
  51      combiner_anything : Ast.anything  -> 'a;
  52      combiner_expression_dots : Ast.expression Ast.dots -> 'a;
  53      combiner_statement_dots : Ast.statement Ast.dots -> 'a;
  54      combiner_declaration_dots : Ast.declaration Ast.dots -> 'a;
  55      combiner_initialiser_dots : Ast.initialiser Ast.dots -> 'a}
  56
  57 type ('mc,'a) cmcode = 'a combiner -> 'mc Ast_cocci.mcode -> 'a
  58 type ('cd,'a) ccode = 'a combiner -> ('cd -> 'a) -> 'cd -> 'a
  59
  60
  61 let combiner bind option_default
  62     meta_mcodefn string_mcodefn const_mcodefn assign_mcodefn fix_mcodefn
  63     unary_mcodefn binary_mcodefn
  64     cv_mcodefn sign_mcodefn struct_mcodefn storage_mcodefn
  65     inc_file_mcodefn
  66     expdotsfn paramdotsfn stmtdotsfn decldotsfn initdotsfn
  67     identfn exprfn ftfn tyfn initfn paramfn declfn rulefn stmtfn casefn
  68     topfn anyfn =
  69   let multibind l =
  70     let rec loop = function
  71         [] -> option_default
  72       | [x] -> x
  73       | x::xs -> bind x (loop xs) in
  74     loop l in
  75   let get_option f = function
  76       Some x -> f x
  77     | None -> option_default in
  78
  79   let dotsfn param default all_functions arg =
  80     let k d =
  81       match Ast.unwrap d with
  82         Ast.DOTS(l) | Ast.CIRCLES(l) | Ast.STARS(l) ->
  83           multibind (List.map default l) in
  84     param all_functions k arg in
  85
  86   let rec meta_mcode x = meta_mcodefn all_functions x
  87   and string_mcode x = string_mcodefn all_functions x
  88   and const_mcode x = const_mcodefn all_functions x
  89   and assign_mcode x = assign_mcodefn all_functions x
  90   and fix_mcode x = fix_mcodefn all_functions x
  91   and unary_mcode x = unary_mcodefn all_functions x
  92   and binary_mcode x = binary_mcodefn all_functions x
  93   and cv_mcode x = cv_mcodefn all_functions x
  94   and sign_mcode x = sign_mcodefn all_functions x
  95   and struct_mcode x = struct_mcodefn all_functions x
  96   and storage_mcode x = storage_mcodefn all_functions x
  97   and inc_file_mcode x = inc_file_mcodefn all_functions x
  98
  99   and expression_dots d = dotsfn expdotsfn expression all_functions d
 100   and parameter_dots d = dotsfn paramdotsfn parameterTypeDef all_functions d
 101   and statement_dots d = dotsfn stmtdotsfn statement all_functions d
 102   and declaration_dots d = dotsfn decldotsfn declaration all_functions d
 103   and initialiser_dots d = dotsfn initdotsfn initialiser all_functions d
 104
 105   and ident i =
 106     let k i =
 107       match Ast.unwrap i with
 108         Ast.Id(name) -> string_mcode name
 109       | Ast.MetaId(name,_,_,_) -> meta_mcode name
 110       | Ast.MetaFunc(name,_,_,_) -> meta_mcode name
 111       | Ast.MetaLocalFunc(name,_,_,_) -> meta_mcode name
 112       | Ast.DisjId(id_list) -> multibind (List.map ident id_list)
 113       | Ast.OptIdent(id) -> ident id
 114       | Ast.UniqueIdent(id) -> ident id in
 115     identfn all_functions k i
 116
 117   and expression e =
 118     let k e =
 119       match Ast.unwrap e with
 120         Ast.Ident(id) -> ident id
 121       | Ast.Constant(const) -> const_mcode const
 122       | Ast.FunCall(fn,lp,args,rp) ->
 123           multibind [expression fn; string_mcode lp; expression_dots args;
 124                       string_mcode rp]
 125       | Ast.Assignment(left,op,right,simple) ->
 126           multibind [expression left; assign_mcode op; expression right]
 127       | Ast.Sequence(left,op,right) ->
 128           multibind [expression left; string_mcode op; expression right]
 129       | Ast.CondExpr(exp1,why,exp2,colon,exp3) ->
 130           multibind [expression exp1; string_mcode why;
 131                       get_option expression exp2; string_mcode colon;
 132                       expression exp3]
 133       | Ast.Postfix(exp,op) -> bind (expression exp) (fix_mcode op)
 134       | Ast.Infix(exp,op) -> bind (fix_mcode op) (expression exp)
 135       | Ast.Unary(exp,op) -> bind (unary_mcode op) (expression exp)
 136       | Ast.Binary(left,op,right) ->
 137           multibind [expression left; binary_mcode op; expression right]
 138       | Ast.Nested(left,op,right) ->
 139           multibind [expression left; binary_mcode op; expression right]
 140       | Ast.Paren(lp,exp,rp) ->
 141           multibind [string_mcode lp; expression exp; string_mcode rp]
 142       | Ast.ArrayAccess(exp1,lb,exp2,rb) ->
 143           multibind
 144             [expression exp1; string_mcode lb; expression exp2;
 145               string_mcode rb]
 146       | Ast.RecordAccess(exp,pt,field) ->
 147           multibind [expression exp; string_mcode pt; ident field]
 148       | Ast.RecordPtAccess(exp,ar,field) ->
 149           multibind [expression exp; string_mcode ar; ident field]
 150       | Ast.Cast(lp,ty,rp,exp) ->
 151           multibind
 152             [string_mcode lp; fullType ty; string_mcode rp; expression exp]
 153       | Ast.SizeOfExpr(szf,exp) ->
 154           multibind [string_mcode szf; expression exp]
 155       | Ast.SizeOfType(szf,lp,ty,rp) ->
 156           multibind
 157             [string_mcode szf; string_mcode lp; fullType ty; string_mcode rp]
 158       | Ast.TypeExp(ty) -> fullType ty
 159       | Ast.Constructor(lp,ty,rp,init) ->
 160           multibind
 161             [string_mcode lp; fullType ty; string_mcode rp; initialiser init]
 162       | Ast.MetaErr(name,_,_,_)
 163       | Ast.MetaExpr(name,_,_,_,_,_)
 164       | Ast.MetaExprList(name,_,_,_) -> meta_mcode name
 165       | Ast.AsExpr(exp,asexp) -> bind (expression exp) (expression asexp)
 166       | Ast.EComma(cm) -> string_mcode cm
 167       | Ast.DisjExpr(exp_list) -> multibind (List.map expression exp_list)
 168       | Ast.NestExpr(starter,expr_dots,ender,whencode,multi) ->
 169           bind (string_mcode starter)
 170             (bind (expression_dots expr_dots)
 171                (bind (string_mcode ender)
 172                   (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.AsType(ty,asty) -> bind (fullType ty) (fullType asty)
 185       | Ast.DisjType(types) -> multibind (List.map fullType types)
 186       | Ast.OptType(ty) -> fullType ty
 187       | Ast.UniqueType(ty) -> fullType ty in
 188     ftfn all_functions k ft
 189
 190   and function_pointer (ty,lp1,star,rp1,lp2,params,rp2) extra =
 191     (* have to put the treatment of the identifier into the right position *)
 192     multibind
 193       ([fullType ty; string_mcode lp1; string_mcode star] @ extra @
 194        [string_mcode rp1;
 195          string_mcode lp2; parameter_dots params; string_mcode rp2])
 196
 197   and function_type (ty,lp1,params,rp1) extra =
 198     (* have to put the treatment of the identifier into the right position *)
 199     multibind
 200       ([get_option fullType ty] @ extra @
 201        [string_mcode lp1; parameter_dots params; string_mcode rp1])
 202
 203   and array_type (ty,lb,size,rb) extra =
 204     multibind
 205       ([fullType ty] @ extra @
 206        [string_mcode lb; get_option expression size; string_mcode rb])
 207
 208   and typeC ty =
 209     let k ty =
 210       match Ast.unwrap ty with
 211         Ast.BaseType(ty,strings) -> multibind (List.map string_mcode strings)
 212       | Ast.SignedT(sgn,ty) -> bind (sign_mcode sgn) (get_option typeC ty)
 213       | Ast.Pointer(ty,star) ->
 214           bind (fullType ty) (string_mcode star)
 215       | Ast.FunctionPointer(ty,lp1,star,rp1,lp2,params,rp2) ->
 216           function_pointer (ty,lp1,star,rp1,lp2,params,rp2) []
 217       | Ast.FunctionType (_,ty,lp1,params,rp1) ->
 218           function_type (ty,lp1,params,rp1) []
 219       | Ast.Array(ty,lb,size,rb) -> array_type (ty,lb,size,rb) []
 220       | Ast.EnumName(kind,name) ->
 221           bind (string_mcode kind) (get_option ident name)
 222       | Ast.EnumDef(ty,lb,ids,rb) ->
 223           multibind
 224             [fullType ty; string_mcode lb; expression_dots ids;
 225               string_mcode rb]
 226       | Ast.StructUnionName(kind,name) ->
 227           bind (struct_mcode kind) (get_option ident name)
 228       | Ast.StructUnionDef(ty,lb,decls,rb) ->
 229           multibind
 230             [fullType ty; string_mcode lb; declaration_dots decls;
 231               string_mcode rb]
 232       | Ast.TypeName(name) -> string_mcode name
 233       | Ast.MetaType(name,_,_) -> meta_mcode name in
 234     tyfn all_functions k ty
 235
 236   and named_type ty id =
 237     match Ast.unwrap ty with
 238       Ast.Type(_,None,ty1) ->
 239         (match Ast.unwrap ty1 with
 240           Ast.FunctionPointer(ty,lp1,star,rp1,lp2,params,rp2) ->
 241             function_pointer (ty,lp1,star,rp1,lp2,params,rp2) [ident id]
 242         | Ast.FunctionType(_,ty,lp1,params,rp1) ->
 243             function_type (ty,lp1,params,rp1) [ident id]
 244         | Ast.Array(ty,lb,size,rb) -> array_type (ty,lb,size,rb) [ident id]
 245         | _ -> bind (fullType ty) (ident id))
 246     | _ -> bind (fullType ty) (ident id)
 247
 248   and declaration d =
 249     let k d =
 250       match Ast.unwrap d with
 251         Ast.MetaDecl(name,_,_) | Ast.MetaField(name,_,_)
 252       | Ast.MetaFieldList(name,_,_,_) ->
 253           meta_mcode name
 254       | Ast.AsDecl(decl,asdecl) ->
 255           bind (declaration decl) (declaration asdecl)
 256       | Ast.Init(stg,ty,id,eq,ini,sem) ->
 257           bind (get_option storage_mcode stg)
 258             (bind (named_type ty id)
 259                (multibind
 260                   [string_mcode eq; initialiser ini; string_mcode sem]))
 261       | Ast.UnInit(stg,ty,id,sem) ->
 262           bind (get_option storage_mcode stg)
 263             (bind (named_type ty id) (string_mcode sem))
 264       | Ast.MacroDecl(name,lp,args,rp,sem) ->
 265           multibind
 266             [ident name; string_mcode lp; expression_dots args;
 267               string_mcode rp; string_mcode sem]
 268       | Ast.MacroDeclInit(name,lp,args,rp,eq,ini,sem) ->
 269           multibind
 270             [ident name; string_mcode lp; expression_dots args;
 271               string_mcode rp; string_mcode eq; initialiser ini;
 272               string_mcode sem]
 273       | Ast.TyDecl(ty,sem) -> bind (fullType ty) (string_mcode sem)
 274       | Ast.Typedef(stg,ty,id,sem) ->
 275           bind (string_mcode stg)
 276             (bind (fullType ty) (bind (typeC id) (string_mcode sem)))
 277       | Ast.DisjDecl(decls) -> multibind (List.map declaration decls)
 278       | Ast.Ddots(dots,whencode) ->
 279           bind (string_mcode dots) (get_option declaration whencode)
 280       | Ast.OptDecl(decl) -> declaration decl
 281       | Ast.UniqueDecl(decl) -> declaration decl in
 282     declfn all_functions k d
 283
 284   and initialiser i =
 285     let k i =
 286       match Ast.unwrap i with
 287         Ast.MetaInit(name,_,_) -> meta_mcode name
 288       | Ast.MetaInitList(name,_,_,_) -> meta_mcode name
 289       | Ast.AsInit(init,asinit) ->
 290           bind (initialiser init) (initialiser asinit)
 291       | Ast.InitExpr(exp) -> expression exp
 292       | Ast.ArInitList(lb,initlist,rb) ->
 293           multibind
 294             [string_mcode lb; initialiser_dots initlist; string_mcode rb]
 295       | Ast.StrInitList(allminus,lb,initlist,rb,whencode) ->
 296           multibind
 297             [string_mcode lb;
 298               multibind (List.map initialiser initlist);
 299               string_mcode rb;
 300               multibind (List.map initialiser whencode)]
 301       | Ast.InitGccName(name,eq,ini) ->
 302           multibind [ident name; string_mcode eq; initialiser ini]
 303       | Ast.InitGccExt(designators,eq,ini) ->
 304           multibind
 305             ((List.map designator designators) @
 306              [string_mcode eq; initialiser ini])
 307       | Ast.IComma(cm) -> string_mcode cm
 308       | Ast.Idots(dots,whencode) ->
 309           bind (string_mcode dots) (get_option initialiser whencode)
 310       | Ast.OptIni(i) -> initialiser i
 311       | Ast.UniqueIni(i) -> initialiser i in
 312     initfn all_functions k i
 313
 314   and designator = function
 315       Ast.DesignatorField(dot,id) -> bind (string_mcode dot) (ident id)
 316     | Ast.DesignatorIndex(lb,exp,rb) ->
 317         bind (string_mcode lb) (bind (expression exp) (string_mcode rb))
 318     | Ast.DesignatorRange(lb,min,dots,max,rb) ->
 319         multibind
 320           [string_mcode lb; expression min; string_mcode dots;
 321             expression max; string_mcode rb]
 322
 323   and parameterTypeDef p =
 324     let k p =
 325       match Ast.unwrap p with
 326         Ast.VoidParam(ty) -> fullType ty
 327       | Ast.Param(ty,Some id) -> named_type ty id
 328       | Ast.Param(ty,None) -> fullType ty
 329       | Ast.MetaParam(name,_,_) -> meta_mcode name
 330       | Ast.MetaParamList(name,_,_,_) -> meta_mcode name
 331       | Ast.PComma(cm) -> string_mcode cm
 332       | Ast.Pdots(dots) -> string_mcode dots
 333       | Ast.Pcircles(dots) -> string_mcode dots
 334       | Ast.OptParam(param) -> parameterTypeDef param
 335       | Ast.UniqueParam(param) -> parameterTypeDef param in
 336     paramfn all_functions k p
 337
 338   and rule_elem re =
 339     let k re =
 340       match Ast.unwrap re with
 341         Ast.FunHeader(_,_,fi,name,lp,params,rp) ->
 342           multibind
 343             ((List.map fninfo fi) @
 344              [ident name;string_mcode lp;parameter_dots params;
 345                string_mcode rp])
 346       | Ast.Decl(_,_,decl) -> declaration decl
 347       | Ast.SeqStart(brace) -> string_mcode brace
 348       | Ast.SeqEnd(brace) -> string_mcode brace
 349       | Ast.ExprStatement(exp,sem) ->
 350           bind (get_option expression exp) (string_mcode sem)
 351       | Ast.IfHeader(iff,lp,exp,rp) ->
 352           multibind [string_mcode iff; string_mcode lp; expression exp;
 353                       string_mcode rp]
 354       | Ast.Else(els) -> string_mcode els
 355       | Ast.WhileHeader(whl,lp,exp,rp) ->
 356           multibind [string_mcode whl; string_mcode lp; expression exp;
 357                       string_mcode rp]
 358       | Ast.DoHeader(d) -> string_mcode d
 359       | Ast.WhileTail(whl,lp,exp,rp,sem) ->
 360           multibind [string_mcode whl; string_mcode lp; expression exp;
 361                       string_mcode rp; string_mcode sem]
 362       | Ast.ForHeader(fr,lp,e1,sem1,e2,sem2,e3,rp) ->
 363           multibind [string_mcode fr; string_mcode lp;
 364                       get_option expression e1; string_mcode sem1;
 365                       get_option expression e2; string_mcode sem2;
 366                       get_option expression e3; string_mcode rp]
 367       | Ast.IteratorHeader(nm,lp,args,rp) ->
 368           multibind [ident nm; string_mcode lp;
 369                       expression_dots args; string_mcode rp]
 370       | Ast.SwitchHeader(switch,lp,exp,rp) ->
 371           multibind [string_mcode switch; string_mcode lp; expression exp;
 372                       string_mcode rp]
 373       | Ast.Break(br,sem) -> bind (string_mcode br) (string_mcode sem)
 374       | Ast.Continue(cont,sem) -> bind (string_mcode cont) (string_mcode sem)
 375       | Ast.Label(l,dd) -> bind (ident l) (string_mcode dd)
 376       | Ast.Goto(goto,l,sem) ->
 377           bind (string_mcode goto) (bind (ident l) (string_mcode sem))
 378       | Ast.Return(ret,sem) -> bind (string_mcode ret) (string_mcode sem)
 379       | Ast.ReturnExpr(ret,exp,sem) ->
 380           multibind [string_mcode ret; expression exp; string_mcode sem]
 381       | Ast.MetaStmt(name,_,_,_) -> meta_mcode name
 382       | Ast.MetaStmtList(name,_,_) -> meta_mcode name
 383       | Ast.MetaRuleElem(name,_,_) -> meta_mcode name
 384       | Ast.Exp(exp) -> expression exp
 385       | Ast.TopExp(exp) -> expression exp
 386       | Ast.Ty(ty) -> fullType ty
 387       | Ast.TopInit(init) -> initialiser init
 388       | Ast.Include(inc,name) -> bind (string_mcode inc) (inc_file_mcode name)
 389       | Ast.Undef(def,id) ->
 390           multibind [string_mcode def; ident id]
 391       | Ast.DefineHeader(def,id,params) ->
 392           multibind [string_mcode def; ident id; define_parameters params]
 393       | Ast.Default(def,colon) -> bind (string_mcode def) (string_mcode colon)
 394       | Ast.Case(case,exp,colon) ->
 395           multibind [string_mcode case; expression exp; string_mcode colon]
 396       | Ast.DisjRuleElem(res) -> multibind (List.map rule_elem res) in
 397     rulefn all_functions k re
 398
 399   (* not parameterizable for now... *)
 400   and define_parameters p =
 401     let k p =
 402       match Ast.unwrap p with
 403         Ast.NoParams -> option_default
 404       | Ast.DParams(lp,params,rp) ->
 405           multibind
 406             [string_mcode lp; define_param_dots params; string_mcode rp] in
 407     k p
 408
 409   and define_param_dots d =
 410     let k d =
 411       match Ast.unwrap d with
 412         Ast.DOTS(l) | Ast.CIRCLES(l) | Ast.STARS(l) ->
 413           multibind (List.map define_param l) in
 414     k d
 415
 416   and define_param p =
 417     let k p =
 418       match Ast.unwrap p with
 419         Ast.DParam(id) -> ident id
 420       | Ast.DPComma(comma) -> string_mcode comma
 421       | Ast.DPdots(d) -> string_mcode d
 422       | Ast.DPcircles(c) -> string_mcode c
 423       | Ast.OptDParam(dp) -> define_param dp
 424       | Ast.UniqueDParam(dp) -> define_param dp in
 425     k p
 426
 427   (* discard the result, because the statement is assumed to be already
 428      represented elsewhere in the code *)
 429   and process_bef_aft s =
 430     match Ast.get_dots_bef_aft s with
 431       Ast.NoDots -> ()
 432     | Ast.DroppingBetweenDots(stm,ind) -> let _ = statement stm in ()
 433     | Ast.AddingBetweenDots(stm,ind) -> let _ = statement stm in ()
 434
 435   and statement s =
 436     process_bef_aft s;
 437     let k s =
 438       match Ast.unwrap s with
 439         Ast.Seq(lbrace,body,rbrace) ->
 440           multibind [rule_elem lbrace;
 441                       statement_dots body; rule_elem rbrace]
 442       | Ast.IfThen(header,branch,_) ->
 443           multibind [rule_elem header; statement branch]
 444       | Ast.IfThenElse(header,branch1,els,branch2,_) ->
 445           multibind [rule_elem header; statement branch1; rule_elem els;
 446                       statement branch2]
 447       | Ast.While(header,body,_) ->
 448           multibind [rule_elem header; statement body]
 449       | Ast.Do(header,body,tail) ->
 450           multibind [rule_elem header; statement body; rule_elem tail]
 451       | Ast.For(header,body,_) -> multibind [rule_elem header; statement body]
 452       | Ast.Iterator(header,body,_) ->
 453           multibind [rule_elem header; statement body]
 454       | Ast.Switch(header,lb,decls,cases,rb) ->
 455           multibind [rule_elem header;rule_elem lb;
 456                       statement_dots decls;
 457                       multibind (List.map case_line cases);
 458                       rule_elem rb]
 459       | Ast.Atomic(re) -> rule_elem re
 460       | Ast.Disj(stmt_dots_list) ->
 461           multibind (List.map statement_dots stmt_dots_list)
 462       | Ast.Nest(starter,stmt_dots,ender,whn,_,_,_) ->
 463           bind (string_mcode starter)
 464             (bind (statement_dots stmt_dots)
 465                (bind (string_mcode ender)
 466                   (multibind
 467                      (List.map (whencode statement_dots statement) whn))))
 468       | Ast.FunDecl(header,lbrace,body,rbrace) ->
 469           multibind [rule_elem header; rule_elem lbrace;
 470                       statement_dots body; rule_elem rbrace]
 471       | Ast.Define(header,body) ->
 472           bind (rule_elem header) (statement_dots body)
 473       | Ast.AsStmt(stm,asstm) ->
 474           bind (statement stm) (statement asstm)
 475       | Ast.Dots(d,whn,_,_) | Ast.Circles(d,whn,_,_) | Ast.Stars(d,whn,_,_) ->
 476           bind (string_mcode d)
 477             (multibind (List.map (whencode statement_dots statement) whn))
 478       | Ast.OptStm(stmt) | Ast.UniqueStm(stmt) ->
 479           statement stmt in
 480     stmtfn all_functions k s
 481
 482   and fninfo = function
 483       Ast.FStorage(stg) -> storage_mcode stg
 484     | Ast.FType(ty) -> fullType ty
 485     | Ast.FInline(inline) -> string_mcode inline
 486     | Ast.FAttr(attr) -> string_mcode attr
 487
 488   and whencode notfn alwaysfn = function
 489       Ast.WhenNot a -> notfn a
 490     | Ast.WhenAlways a -> alwaysfn a
 491     | Ast.WhenModifier(_) -> option_default
 492     | Ast.WhenNotTrue(e) -> rule_elem e
 493     | Ast.WhenNotFalse(e) -> rule_elem e
 494
 495   and case_line c =
 496     let k c =
 497       match Ast.unwrap c with
 498         Ast.CaseLine(header,code) ->
 499           bind (rule_elem header) (statement_dots code)
 500       | Ast.OptCase(case) -> case_line case in
 501     casefn all_functions k c
 502
 503   and top_level t =
 504     let k t =
 505       match Ast.unwrap t with
 506         Ast.FILEINFO(old_file,new_file) ->
 507           bind (string_mcode old_file) (string_mcode new_file)
 508       | Ast.NONDECL(stmt) -> statement stmt
 509       | Ast.CODE(stmt_dots) -> statement_dots stmt_dots
 510       | Ast.ERRORWORDS(exps) -> multibind (List.map expression exps) in
 511     topfn all_functions k t
 512
 513   and anything a =
 514     let k = function
 515         (*in many cases below, the thing is not even mcode, so we do nothing*)
 516         Ast.FullTypeTag(ft) -> fullType ft
 517       | Ast.BaseTypeTag(bt) -> option_default
 518       | Ast.StructUnionTag(su) -> option_default
 519       | Ast.SignTag(sgn) -> option_default
 520       | Ast.IdentTag(id) -> ident id
 521       | Ast.ExpressionTag(exp) -> expression exp
 522       | Ast.ConstantTag(cst) -> option_default
 523       | Ast.UnaryOpTag(unop) -> option_default
 524       | Ast.AssignOpTag(asgnop) -> option_default
 525       | Ast.FixOpTag(fixop) -> option_default
 526       | Ast.BinaryOpTag(binop) -> option_default
 527       | Ast.ArithOpTag(arithop) -> option_default
 528       | Ast.LogicalOpTag(logop) -> option_default
 529       | Ast.DeclarationTag(decl) -> declaration decl
 530       | Ast.InitTag(ini) -> initialiser ini
 531       | Ast.StorageTag(stg) -> option_default
 532       | Ast.IncFileTag(stg) -> option_default
 533       | Ast.Rule_elemTag(rule) -> rule_elem rule
 534       | Ast.StatementTag(rule) -> statement rule
 535       | Ast.CaseLineTag(case) -> case_line case
 536       | Ast.ConstVolTag(cv) -> option_default
 537       | Ast.Token(tok,info) -> option_default
 538       | Ast.Pragma(str) -> option_default
 539       | Ast.Code(cd) -> top_level cd
 540       | Ast.ExprDotsTag(ed) -> expression_dots ed
 541       | Ast.ParamDotsTag(pd) -> parameter_dots pd
 542       | Ast.StmtDotsTag(sd) -> statement_dots sd
 543       | Ast.DeclDotsTag(sd) -> declaration_dots sd
 544       | Ast.TypeCTag(ty) -> typeC ty
 545       | Ast.ParamTag(param) -> parameterTypeDef param
 546       | Ast.SgrepStartTag(tok) -> option_default
 547       | Ast.SgrepEndTag(tok) -> option_default in
 548     anyfn all_functions k a
 549
 550   and all_functions =
 551     {combiner_ident = ident;
 552       combiner_expression = expression;
 553       combiner_fullType = fullType;
 554       combiner_typeC = typeC;
 555       combiner_declaration = declaration;
 556       combiner_initialiser = initialiser;
 557       combiner_parameter = parameterTypeDef;
 558       combiner_parameter_list = parameter_dots;
 559       combiner_rule_elem = rule_elem;
 560       combiner_statement = statement;
 561       combiner_case_line = case_line;
 562       combiner_top_level = top_level;
 563       combiner_anything = anything;
 564       combiner_expression_dots = expression_dots;
 565       combiner_statement_dots = statement_dots;
 566       combiner_declaration_dots = declaration_dots;
 567       combiner_initialiser_dots = initialiser_dots} in
 568   all_functions
 569
 570 (* ---------------------------------------------------------------------- *)
 571
 572 type 'a inout = 'a -> 'a (* for specifying the type of rebuilder *)
 573
 574 type rebuilder =
 575     {rebuilder_ident : Ast.ident inout;
 576       rebuilder_expression : Ast.expression inout;
 577       rebuilder_fullType : Ast.fullType inout;
 578       rebuilder_typeC : Ast.typeC inout;
 579       rebuilder_declaration : Ast.declaration inout;
 580       rebuilder_initialiser : Ast.initialiser inout;
 581       rebuilder_parameter : Ast.parameterTypeDef inout;
 582       rebuilder_parameter_list : Ast.parameter_list inout;
 583       rebuilder_statement : Ast.statement inout;
 584       rebuilder_case_line : Ast.case_line inout;
 585       rebuilder_rule_elem : Ast.rule_elem inout;
 586       rebuilder_top_level : Ast.top_level inout;
 587       rebuilder_expression_dots : Ast.expression Ast.dots inout;
 588       rebuilder_statement_dots : Ast.statement Ast.dots inout;
 589       rebuilder_declaration_dots : Ast.declaration Ast.dots inout;
 590       rebuilder_initialiser_dots : Ast.initialiser Ast.dots inout;
 591       rebuilder_define_param_dots : Ast.define_param Ast.dots inout;
 592       rebuilder_define_param : Ast.define_param inout;
 593       rebuilder_define_parameters : Ast.define_parameters inout;
 594       rebuilder_anything : Ast.anything inout}
 595
 596 type 'mc rmcode = 'mc Ast.mcode inout
 597 type 'cd rcode = rebuilder -> ('cd inout) -> 'cd inout
 598
 599
 600 let rebuilder
 601     meta_mcode string_mcode const_mcode assign_mcode fix_mcode unary_mcode
 602     binary_mcode cv_mcode sign_mcode struct_mcode storage_mcode
 603     inc_file_mcode
 604     expdotsfn paramdotsfn stmtdotsfn decldotsfn initdotsfn
 605     identfn exprfn ftfn tyfn initfn paramfn declfn rulefn stmtfn casefn
 606     topfn anyfn =
 607   let get_option f = function
 608       Some x -> Some (f x)
 609     | None -> None in
 610
 611   let dotsfn param default all_functions arg =
 612     let k d =
 613       Ast.rewrap d
 614         (match Ast.unwrap d with
 615           Ast.DOTS(l) -> Ast.DOTS(List.map default l)
 616         | Ast.CIRCLES(l) -> Ast.CIRCLES(List.map default l)
 617         | Ast.STARS(l) -> Ast.STARS(List.map default l)) in
 618     param all_functions k arg in
 619
 620   let rec expression_dots d = dotsfn expdotsfn expression all_functions d
 621   and parameter_dots d = dotsfn paramdotsfn parameterTypeDef all_functions d
 622   and statement_dots d = dotsfn stmtdotsfn statement all_functions d
 623   and declaration_dots d = dotsfn decldotsfn declaration all_functions d
 624   and initialiser_dots d = dotsfn initdotsfn initialiser all_functions d
 625
 626   and ident i =
 627     let k i =
 628       Ast.rewrap i
 629         (match Ast.unwrap i with
 630           Ast.Id(name) -> Ast.Id(string_mcode name)
 631         | Ast.MetaId(name,constraints,keep,inherited) ->
 632             Ast.MetaId(meta_mcode name,constraints,keep,inherited)
 633         | Ast.MetaFunc(name,constraints,keep,inherited) ->
 634             Ast.MetaFunc(meta_mcode name,constraints,keep,inherited)
 635         | Ast.MetaLocalFunc(name,constraints,keep,inherited) ->
 636             Ast.MetaLocalFunc(meta_mcode name,constraints,keep,inherited)
 637         | Ast.DisjId(id_list) -> Ast.DisjId(List.map ident id_list)
 638         | Ast.OptIdent(id) -> Ast.OptIdent(ident id)
 639         | Ast.UniqueIdent(id) -> Ast.UniqueIdent(ident id)) in
 640     identfn all_functions k i
 641
 642   and expression e =
 643     let k e =
 644       Ast.rewrap e
 645         (match Ast.unwrap e with
 646           Ast.Ident(id) -> Ast.Ident(ident id)
 647         | Ast.Constant(const) -> Ast.Constant(const_mcode const)
 648         | Ast.FunCall(fn,lp,args,rp) ->
 649             Ast.FunCall(expression fn, string_mcode lp, expression_dots args,
 650                         string_mcode rp)
 651         | Ast.Assignment(left,op,right,simple) ->
 652             Ast.Assignment(expression left, assign_mcode op, expression right,
 653                            simple)
 654         | Ast.Sequence(left,op,right) ->
 655             Ast.Sequence(expression left, string_mcode op, expression right)
 656         | Ast.CondExpr(exp1,why,exp2,colon,exp3) ->
 657             Ast.CondExpr(expression exp1, string_mcode why,
 658                          get_option expression exp2, string_mcode colon,
 659                          expression exp3)
 660         | Ast.Postfix(exp,op) -> Ast.Postfix(expression exp,fix_mcode op)
 661         | Ast.Infix(exp,op) -> Ast.Infix(expression exp,fix_mcode op)
 662         | Ast.Unary(exp,op) -> Ast.Unary(expression exp,unary_mcode op)
 663         | Ast.Binary(left,op,right) ->
 664             Ast.Binary(expression left, binary_mcode op, expression right)
 665         | Ast.Nested(left,op,right) ->
 666             Ast.Nested(expression left, binary_mcode op, expression right)
 667         | Ast.Paren(lp,exp,rp) ->
 668             Ast.Paren(string_mcode lp, expression exp, string_mcode rp)
 669         | Ast.ArrayAccess(exp1,lb,exp2,rb) ->
 670             Ast.ArrayAccess(expression exp1, string_mcode lb, expression exp2,
 671                             string_mcode rb)
 672         | Ast.RecordAccess(exp,pt,field) ->
 673             Ast.RecordAccess(expression exp, string_mcode pt, ident field)
 674         | Ast.RecordPtAccess(exp,ar,field) ->
 675             Ast.RecordPtAccess(expression exp, string_mcode ar, ident field)
 676         | Ast.Cast(lp,ty,rp,exp) ->
 677             Ast.Cast(string_mcode lp, fullType ty, string_mcode rp,
 678                      expression exp)
 679         | Ast.SizeOfExpr(szf,exp) ->
 680             Ast.SizeOfExpr(string_mcode szf, expression exp)
 681         | Ast.SizeOfType(szf,lp,ty,rp) ->
 682             Ast.SizeOfType(string_mcode szf,string_mcode lp, fullType ty,
 683                            string_mcode rp)
 684         | Ast.TypeExp(ty) -> Ast.TypeExp(fullType ty)
 685         | Ast.Constructor(lp,ty,rp,init) ->
 686             Ast.Constructor(string_mcode lp, fullType ty, string_mcode rp,
 687                      initialiser init)
 688         | Ast.MetaErr(name,constraints,keep,inherited) ->
 689             Ast.MetaErr(meta_mcode name,constraints,keep,inherited)
 690         | Ast.MetaExpr(name,constraints,keep,ty,form,inherited) ->
 691             Ast.MetaExpr(meta_mcode name,constraints,keep,ty,form,inherited)
 692         | Ast.MetaExprList(name,lenname_inh,keep,inherited) ->
 693             Ast.MetaExprList(meta_mcode name,lenname_inh,keep,inherited)
 694         | Ast.AsExpr(exp,asexp) -> Ast.AsExpr(expression exp,expression asexp)
 695         | Ast.EComma(cm) -> Ast.EComma(string_mcode cm)
 696         | Ast.DisjExpr(exp_list) -> Ast.DisjExpr(List.map expression exp_list)
 697         | Ast.NestExpr(starter,expr_dots,ender,whencode,multi) ->
 698             Ast.NestExpr(string_mcode starter,expression_dots expr_dots,
 699                          string_mcode ender,
 700                          get_option expression whencode,multi)
 701         | Ast.Edots(dots,whencode) ->
 702             Ast.Edots(string_mcode dots,get_option expression whencode)
 703         | Ast.Ecircles(dots,whencode) ->
 704             Ast.Ecircles(string_mcode dots,get_option expression whencode)
 705         | Ast.Estars(dots,whencode) ->
 706             Ast.Estars(string_mcode dots,get_option expression whencode)
 707         | Ast.OptExp(exp) -> Ast.OptExp(expression exp)
 708         | Ast.UniqueExp(exp) -> Ast.UniqueExp(expression exp)) in
 709     exprfn all_functions k e
 710
 711   and fullType ft =
 712     let k ft =
 713       Ast.rewrap ft
 714         (match Ast.unwrap ft with
 715           Ast.Type(allminus,cv,ty) ->
 716             Ast.Type (allminus,get_option cv_mcode cv, typeC ty)
 717         | Ast.AsType(ty,asty) -> Ast.AsType(fullType ty,fullType asty)
 718         | Ast.DisjType(types) -> Ast.DisjType(List.map fullType types)
 719         | Ast.OptType(ty) -> Ast.OptType(fullType ty)
 720         | Ast.UniqueType(ty) -> Ast.UniqueType(fullType ty)) in
 721     ftfn all_functions k ft
 722
 723   and typeC ty =
 724     let k ty =
 725       Ast.rewrap ty
 726         (match Ast.unwrap ty with
 727           Ast.BaseType(ty,strings) ->
 728             Ast.BaseType (ty, List.map string_mcode strings)
 729         | Ast.SignedT(sgn,ty) ->
 730             Ast.SignedT(sign_mcode sgn,get_option typeC ty)
 731         | Ast.Pointer(ty,star) ->
 732             Ast.Pointer (fullType ty, string_mcode star)
 733         | Ast.FunctionPointer(ty,lp1,star,rp1,lp2,params,rp2) ->
 734             Ast.FunctionPointer(fullType ty,string_mcode lp1,string_mcode star,
 735                                 string_mcode rp1,string_mcode lp2,
 736                                 parameter_dots params,
 737                                 string_mcode rp2)
 738         | Ast.FunctionType(allminus,ty,lp,params,rp) ->
 739             Ast.FunctionType(allminus,get_option fullType ty,string_mcode lp,
 740                              parameter_dots params,string_mcode rp)
 741         | Ast.Array(ty,lb,size,rb) ->
 742             Ast.Array(fullType ty, string_mcode lb,
 743                       get_option expression size, string_mcode rb)
 744         | Ast.EnumName(kind,name) ->
 745             Ast.EnumName(string_mcode kind, get_option ident name)
 746         | Ast.EnumDef(ty,lb,ids,rb) ->
 747             Ast.EnumDef (fullType ty, string_mcode lb, expression_dots ids,
 748                          string_mcode rb)
 749         | Ast.StructUnionName(kind,name) ->
 750             Ast.StructUnionName (struct_mcode kind, get_option ident name)
 751         | Ast.StructUnionDef(ty,lb,decls,rb) ->
 752             Ast.StructUnionDef (fullType ty,
 753                                 string_mcode lb, declaration_dots decls,
 754                                 string_mcode rb)
 755         | Ast.TypeName(name) -> Ast.TypeName(string_mcode name)
 756         | Ast.MetaType(name,keep,inherited) ->
 757             Ast.MetaType(meta_mcode name,keep,inherited)) in
 758     tyfn all_functions k ty
 759
 760   and declaration d =
 761     let k d =
 762       Ast.rewrap d
 763         (match Ast.unwrap d with
 764           Ast.MetaDecl(name,keep,inherited) ->
 765             Ast.MetaDecl(meta_mcode name,keep,inherited)
 766         | Ast.MetaField(name,keep,inherited) ->
 767             Ast.MetaField(meta_mcode name,keep,inherited)
 768         | Ast.MetaFieldList(name,lenname_inh,keep,inherited) ->
 769             Ast.MetaFieldList(meta_mcode name,lenname_inh,keep,inherited)
 770         | Ast.AsDecl(decl,asdecl) ->
 771             Ast.AsDecl(declaration decl,declaration asdecl)
 772         | Ast.Init(stg,ty,id,eq,ini,sem) ->
 773             Ast.Init(get_option storage_mcode stg, fullType ty, ident id,
 774                      string_mcode eq, initialiser ini, string_mcode sem)
 775         | Ast.UnInit(stg,ty,id,sem) ->
 776             Ast.UnInit(get_option storage_mcode stg, fullType ty, ident id,
 777                        string_mcode sem)
 778         | Ast.MacroDecl(name,lp,args,rp,sem) ->
 779             Ast.MacroDecl(ident name, string_mcode lp, expression_dots args,
 780                           string_mcode rp,string_mcode sem)
 781         | Ast.MacroDeclInit(name,lp,args,rp,eq,ini,sem) ->
 782             Ast.MacroDeclInit
 783               (ident name, string_mcode lp, expression_dots args,
 784                string_mcode rp,string_mcode eq,initialiser ini,
 785                string_mcode sem)
 786         | Ast.TyDecl(ty,sem) -> Ast.TyDecl(fullType ty, string_mcode sem)
 787         | Ast.Typedef(stg,ty,id,sem) ->
 788             Ast.Typedef(string_mcode stg, fullType ty, typeC id,
 789                         string_mcode sem)
 790         | Ast.DisjDecl(decls) -> Ast.DisjDecl(List.map declaration decls)
 791         | Ast.Ddots(dots,whencode) ->
 792             Ast.Ddots(string_mcode dots, get_option declaration whencode)
 793         | Ast.OptDecl(decl) -> Ast.OptDecl(declaration decl)
 794         | Ast.UniqueDecl(decl) -> Ast.UniqueDecl(declaration decl)) in
 795     declfn all_functions k d
 796
 797   and initialiser i =
 798     let k i =
 799       Ast.rewrap i
 800         (match Ast.unwrap i with
 801           Ast.MetaInit(name,keep,inherited) ->
 802             Ast.MetaInit(meta_mcode name,keep,inherited)
 803         | Ast.MetaInitList(name,lenname_inh,keep,inherited) ->
 804             Ast.MetaInitList(meta_mcode name,lenname_inh,keep,inherited)
 805         | Ast.AsInit(ini,asini) ->
 806             Ast.AsInit(initialiser ini,initialiser asini)
 807         | Ast.InitExpr(exp) -> Ast.InitExpr(expression exp)
 808         | Ast.ArInitList(lb,initlist,rb) ->
 809             Ast.ArInitList(string_mcode lb, initialiser_dots initlist,
 810                            string_mcode rb)
 811         | Ast.StrInitList(allminus,lb,initlist,rb,whencode) ->
 812             Ast.StrInitList(allminus,
 813                          string_mcode lb, List.map initialiser initlist,
 814                          string_mcode rb, List.map initialiser whencode)
 815         | Ast.InitGccName(name,eq,ini) ->
 816             Ast.InitGccName(ident name, string_mcode eq, initialiser ini)
 817         | Ast.InitGccExt(designators,eq,ini) ->
 818             Ast.InitGccExt
 819               (List.map designator designators, string_mcode eq,
 820                initialiser ini)
 821         | Ast.IComma(cm) -> Ast.IComma(string_mcode cm)
 822         | Ast.Idots(dots,whencode) ->
 823             Ast.Idots(string_mcode dots,get_option initialiser whencode)
 824         | Ast.OptIni(i) -> Ast.OptIni(initialiser i)
 825         | Ast.UniqueIni(i) -> Ast.UniqueIni(initialiser i)) in
 826     initfn all_functions k i
 827
 828   and designator = function
 829       Ast.DesignatorField(dot,id) ->
 830         Ast.DesignatorField(string_mcode dot,ident id)
 831     | Ast.DesignatorIndex(lb,exp,rb) ->
 832         Ast.DesignatorIndex(string_mcode lb,expression exp,string_mcode rb)
 833     | Ast.DesignatorRange(lb,min,dots,max,rb) ->
 834         Ast.DesignatorRange(string_mcode lb,expression min,string_mcode dots,
 835                              expression max,string_mcode rb)
 836
 837   and parameterTypeDef p =
 838     let k p =
 839       Ast.rewrap p
 840         (match Ast.unwrap p with
 841           Ast.VoidParam(ty) -> Ast.VoidParam(fullType ty)
 842         | Ast.Param(ty,id) -> Ast.Param(fullType ty, get_option ident id)
 843         | Ast.MetaParam(name,keep,inherited) ->
 844             Ast.MetaParam(meta_mcode name,keep,inherited)
 845         | Ast.MetaParamList(name,lenname_inh,keep,inherited) ->
 846             Ast.MetaParamList(meta_mcode name,lenname_inh,keep,inherited)
 847         | Ast.PComma(cm) -> Ast.PComma(string_mcode cm)
 848         | Ast.Pdots(dots) -> Ast.Pdots(string_mcode dots)
 849         | Ast.Pcircles(dots) -> Ast.Pcircles(string_mcode dots)
 850         | Ast.OptParam(param) -> Ast.OptParam(parameterTypeDef param)
 851         | Ast.UniqueParam(param) -> Ast.UniqueParam(parameterTypeDef param)) in
 852     paramfn all_functions k p
 853
 854   and rule_elem re =
 855     let k re =
 856       Ast.rewrap re
 857         (match Ast.unwrap re with
 858           Ast.FunHeader(bef,allminus,fi,name,lp,params,rp) ->
 859             Ast.FunHeader(bef,allminus,List.map fninfo fi,ident name,
 860                           string_mcode lp, parameter_dots params,
 861                           string_mcode rp)
 862         | Ast.Decl(bef,allminus,decl) ->
 863             Ast.Decl(bef,allminus,declaration decl)
 864         | Ast.SeqStart(brace) -> Ast.SeqStart(string_mcode brace)
 865         | Ast.SeqEnd(brace) -> Ast.SeqEnd(string_mcode brace)
 866         | Ast.ExprStatement(exp,sem) ->
 867             Ast.ExprStatement (get_option expression exp, string_mcode sem)
 868         | Ast.IfHeader(iff,lp,exp,rp) ->
 869             Ast.IfHeader(string_mcode iff, string_mcode lp, expression exp,
 870               string_mcode rp)
 871         | Ast.Else(els) -> Ast.Else(string_mcode els)
 872         | Ast.WhileHeader(whl,lp,exp,rp) ->
 873             Ast.WhileHeader(string_mcode whl, string_mcode lp, expression exp,
 874                             string_mcode rp)
 875         | Ast.DoHeader(d) -> Ast.DoHeader(string_mcode d)
 876         | Ast.WhileTail(whl,lp,exp,rp,sem) ->
 877             Ast.WhileTail(string_mcode whl, string_mcode lp, expression exp,
 878                           string_mcode rp, string_mcode sem)
 879         | Ast.ForHeader(fr,lp,e1,sem1,e2,sem2,e3,rp) ->
 880             Ast.ForHeader(string_mcode fr, string_mcode lp,
 881                           get_option expression e1, string_mcode sem1,
 882                           get_option expression e2, string_mcode sem2,
 883                           get_option expression e3, string_mcode rp)
 884         | Ast.IteratorHeader(whl,lp,args,rp) ->
 885             Ast.IteratorHeader(ident whl, string_mcode lp,
 886                                expression_dots args, string_mcode rp)
 887         | Ast.SwitchHeader(switch,lp,exp,rp) ->
 888             Ast.SwitchHeader(string_mcode switch, string_mcode lp,
 889                              expression exp, string_mcode rp)
 890         | Ast.Break(br,sem) ->
 891             Ast.Break(string_mcode br, string_mcode sem)
 892         | Ast.Continue(cont,sem) ->
 893             Ast.Continue(string_mcode cont, string_mcode sem)
 894         | Ast.Label(l,dd) -> Ast.Label(ident l, string_mcode dd)
 895         | Ast.Goto(goto,l,sem) ->
 896             Ast.Goto(string_mcode goto,ident l,string_mcode sem)
 897         | Ast.Return(ret,sem) ->
 898             Ast.Return(string_mcode ret, string_mcode sem)
 899         | Ast.ReturnExpr(ret,exp,sem) ->
 900             Ast.ReturnExpr(string_mcode ret, expression exp, string_mcode sem)
 901         | Ast.MetaStmt(name,keep,seqible,inherited) ->
 902             Ast.MetaStmt(meta_mcode name,keep,seqible,inherited)
 903         | Ast.MetaStmtList(name,keep,inherited) ->
 904             Ast.MetaStmtList(meta_mcode name,keep,inherited)
 905         | Ast.MetaRuleElem(name,keep,inherited) ->
 906             Ast.MetaRuleElem(meta_mcode name,keep,inherited)
 907         | Ast.Exp(exp) -> Ast.Exp(expression exp)
 908         | Ast.TopExp(exp) -> Ast.TopExp(expression exp)
 909         | Ast.Ty(ty) -> Ast.Ty(fullType ty)
 910         | Ast.TopInit(init) -> Ast.TopInit(initialiser init)
 911         | Ast.Include(inc,name) ->
 912             Ast.Include(string_mcode inc,inc_file_mcode name)
 913         | Ast.Undef(def,id) ->
 914             Ast.Undef(string_mcode def,ident id)
 915         | Ast.DefineHeader(def,id,params) ->
 916             Ast.DefineHeader(string_mcode def,ident id,
 917                              define_parameters params)
 918         | Ast.Default(def,colon) ->
 919             Ast.Default(string_mcode def,string_mcode colon)
 920         | Ast.Case(case,exp,colon) ->
 921             Ast.Case(string_mcode case,expression exp,string_mcode colon)
 922         | Ast.DisjRuleElem(res) -> Ast.DisjRuleElem(List.map rule_elem res)) in
 923     rulefn all_functions k re
 924
 925   (* not parameterizable for now... *)
 926   and define_parameters p =
 927     let k p =
 928       Ast.rewrap p
 929         (match Ast.unwrap p with
 930           Ast.NoParams -> Ast.NoParams
 931         | Ast.DParams(lp,params,rp) ->
 932             Ast.DParams(string_mcode lp,define_param_dots params,
 933                         string_mcode rp)) in
 934     k p
 935
 936   and define_param_dots d =
 937     let k d =
 938       Ast.rewrap d
 939         (match Ast.unwrap d with
 940           Ast.DOTS(l) -> Ast.DOTS(List.map define_param l)
 941         | Ast.CIRCLES(l) -> Ast.CIRCLES(List.map define_param l)
 942         | Ast.STARS(l) -> Ast.STARS(List.map define_param l)) in
 943     k d
 944
 945   and define_param p =
 946     let k p =
 947       Ast.rewrap p
 948         (match Ast.unwrap p with
 949           Ast.DParam(id) -> Ast.DParam(ident id)
 950         | Ast.DPComma(comma) -> Ast.DPComma(string_mcode comma)
 951         | Ast.DPdots(d) -> Ast.DPdots(string_mcode d)
 952         | Ast.DPcircles(c) -> Ast.DPcircles(string_mcode c)
 953         | Ast.OptDParam(dp) -> Ast.OptDParam(define_param dp)
 954         | Ast.UniqueDParam(dp) -> Ast.UniqueDParam(define_param dp)) in
 955     k p
 956
 957   and process_bef_aft s =
 958     Ast.set_dots_bef_aft
 959       (match Ast.get_dots_bef_aft s with
 960         Ast.NoDots -> Ast.NoDots
 961       | Ast.DroppingBetweenDots(stm,ind) ->
 962           Ast.DroppingBetweenDots(statement stm,ind)
 963       | Ast.AddingBetweenDots(stm,ind) ->
 964           Ast.AddingBetweenDots(statement stm,ind))
 965       s
 966
 967   and statement s =
 968     let k s =
 969       Ast.rewrap s
 970         (match Ast.unwrap s with
 971           Ast.Seq(lbrace,body,rbrace) ->
 972             Ast.Seq(rule_elem lbrace,
 973                     statement_dots body, rule_elem rbrace)
 974         | Ast.IfThen(header,branch,aft) ->
 975             Ast.IfThen(rule_elem header, statement branch,aft)
 976         | Ast.IfThenElse(header,branch1,els,branch2,aft) ->
 977             Ast.IfThenElse(rule_elem header, statement branch1, rule_elem els,
 978                            statement branch2, aft)
 979         | Ast.While(header,body,aft) ->
 980             Ast.While(rule_elem header, statement body, aft)
 981         | Ast.Do(header,body,tail) ->
 982             Ast.Do(rule_elem header, statement body, rule_elem tail)
 983         | Ast.For(header,body,aft) ->
 984             Ast.For(rule_elem header, statement body, aft)
 985         | Ast.Iterator(header,body,aft) ->
 986             Ast.Iterator(rule_elem header, statement body, aft)
 987         | Ast.Switch(header,lb,decls,cases,rb) ->
 988             Ast.Switch(rule_elem header,rule_elem lb,
 989                        statement_dots decls,
 990                        List.map case_line cases,rule_elem rb)
 991         | Ast.Atomic(re) -> Ast.Atomic(rule_elem re)
 992         | Ast.Disj(stmt_dots_list) ->
 993             Ast.Disj (List.map statement_dots stmt_dots_list)
 994         | Ast.Nest(starter,stmt_dots,ender,whn,multi,bef,aft) ->
 995             Ast.Nest(string_mcode starter,statement_dots stmt_dots,
 996                      string_mcode ender,
 997                      List.map (whencode statement_dots statement) whn,
 998                      multi,bef,aft)
 999         | Ast.FunDecl(header,lbrace,body,rbrace) ->
1000             Ast.FunDecl(rule_elem header,rule_elem lbrace,
1001                         statement_dots body, rule_elem rbrace)
1002         | Ast.Define(header,body) ->
1003             Ast.Define(rule_elem header,statement_dots body)
1004         | Ast.AsStmt(stm,asstm) -> Ast.AsStmt(statement stm,statement asstm)
1005         | Ast.Dots(d,whn,bef,aft) ->
1006             Ast.Dots(string_mcode d,
1007                      List.map (whencode statement_dots statement) whn,bef,aft)
1008         | Ast.Circles(d,whn,bef,aft) ->
1009             Ast.Circles(string_mcode d,
1010                         List.map (whencode statement_dots statement) whn,
1011                         bef,aft)
1012         | Ast.Stars(d,whn,bef,aft) ->
1013             Ast.Stars(string_mcode d,
1014                       List.map (whencode statement_dots statement) whn,bef,aft)
1015         | Ast.OptStm(stmt) -> Ast.OptStm(statement stmt)
1016         | Ast.UniqueStm(stmt) -> Ast.UniqueStm(statement stmt)) in
1017     let s = stmtfn all_functions k s in
1018     (* better to do this after, in case there is an equality test on the whole
1019        statement, eg in free_vars.  equality test would require that this
1020        subterm not already be changed *)
1021     process_bef_aft s
1022
1023   and fninfo = function
1024       Ast.FStorage(stg) -> Ast.FStorage(storage_mcode stg)
1025     | Ast.FType(ty) -> Ast.FType(fullType ty)
1026     | Ast.FInline(inline) -> Ast.FInline(string_mcode inline)
1027     | Ast.FAttr(attr) -> Ast.FAttr(string_mcode attr)
1028
1029   and whencode notfn alwaysfn = function
1030       Ast.WhenNot a -> Ast.WhenNot (notfn a)
1031     | Ast.WhenAlways a -> Ast.WhenAlways (alwaysfn a)
1032     | Ast.WhenModifier(x)    -> Ast.WhenModifier(x)
1033     | Ast.WhenNotTrue(e) -> Ast.WhenNotTrue(rule_elem e)
1034     | Ast.WhenNotFalse(e) -> Ast.WhenNotFalse(rule_elem e)
1035
1036   and case_line c =
1037     let k c =
1038       Ast.rewrap c
1039         (match Ast.unwrap c with
1040           Ast.CaseLine(header,code) ->
1041             Ast.CaseLine(rule_elem header,statement_dots code)
1042         | Ast.OptCase(case) -> Ast.OptCase(case_line case)) in
1043     casefn all_functions k c
1044
1045   and top_level t =
1046     let k t =
1047       Ast.rewrap t
1048         (match Ast.unwrap t with
1049           Ast.FILEINFO(old_file,new_file) ->
1050             Ast.FILEINFO (string_mcode old_file, string_mcode new_file)
1051         | Ast.NONDECL(stmt) -> Ast.NONDECL(statement stmt)
1052         | Ast.CODE(stmt_dots) -> Ast.CODE(statement_dots stmt_dots)
1053         | Ast.ERRORWORDS(exps) -> Ast.ERRORWORDS (List.map expression exps)) in
1054     topfn all_functions k t
1055
1056   and anything a =
1057     let k = function
1058         (*in many cases below, the thing is not even mcode, so we do nothing*)
1059         Ast.FullTypeTag(ft) -> Ast.FullTypeTag(fullType ft)
1060       | Ast.BaseTypeTag(bt) as x -> x
1061       | Ast.StructUnionTag(su) as x -> x
1062       | Ast.SignTag(sgn) as x -> x
1063       | Ast.IdentTag(id) -> Ast.IdentTag(ident id)
1064       | Ast.ExpressionTag(exp) -> Ast.ExpressionTag(expression exp)
1065       | Ast.ConstantTag(cst) as x -> x
1066       | Ast.UnaryOpTag(unop) as x -> x
1067       | Ast.AssignOpTag(asgnop) as x -> x
1068       | Ast.FixOpTag(fixop) as x -> x
1069       | Ast.BinaryOpTag(binop) as x -> x
1070       | Ast.ArithOpTag(arithop) as x -> x
1071       | Ast.LogicalOpTag(logop) as x -> x
1072       | Ast.InitTag(decl) -> Ast.InitTag(initialiser decl)
1073       | Ast.DeclarationTag(decl) -> Ast.DeclarationTag(declaration decl)
1074       | Ast.StorageTag(stg) as x -> x
1075       | Ast.IncFileTag(stg) as x -> x
1076       | Ast.Rule_elemTag(rule) -> Ast.Rule_elemTag(rule_elem rule)
1077       | Ast.StatementTag(rule) -> Ast.StatementTag(statement rule)
1078       | Ast.CaseLineTag(case) -> Ast.CaseLineTag(case_line case)
1079       | Ast.ConstVolTag(cv) as x -> x
1080       | Ast.Token(tok,info) as x -> x
1081       | Ast.Pragma(str) as x -> x
1082       | Ast.Code(cd) -> Ast.Code(top_level cd)
1083       | Ast.ExprDotsTag(ed) -> Ast.ExprDotsTag(expression_dots ed)
1084       | Ast.ParamDotsTag(pd) -> Ast.ParamDotsTag(parameter_dots pd)
1085       | Ast.StmtDotsTag(sd) -> Ast.StmtDotsTag(statement_dots sd)
1086       | Ast.DeclDotsTag(sd) -> Ast.DeclDotsTag(declaration_dots sd)
1087       | Ast.TypeCTag(ty) -> Ast.TypeCTag(typeC ty)
1088       | Ast.ParamTag(param) -> Ast.ParamTag(parameterTypeDef param)
1089       | Ast.SgrepStartTag(tok) as x -> x
1090       | Ast.SgrepEndTag(tok) as x -> x in
1091     anyfn all_functions k a
1092
1093   and all_functions =
1094     {rebuilder_ident = ident;
1095       rebuilder_expression = expression;
1096       rebuilder_fullType = fullType;
1097       rebuilder_typeC = typeC;
1098       rebuilder_declaration = declaration;
1099       rebuilder_initialiser = initialiser;
1100       rebuilder_parameter = parameterTypeDef;
1101       rebuilder_parameter_list = parameter_dots;
1102       rebuilder_rule_elem = rule_elem;
1103       rebuilder_statement = statement;
1104       rebuilder_case_line = case_line;
1105       rebuilder_top_level = top_level;
1106       rebuilder_expression_dots = expression_dots;
1107       rebuilder_statement_dots = statement_dots;
1108       rebuilder_declaration_dots = declaration_dots;
1109       rebuilder_initialiser_dots = initialiser_dots;
1110       rebuilder_define_param_dots = define_param_dots;
1111       rebuilder_define_param = define_param;
1112       rebuilder_define_parameters = define_parameters;
1113       rebuilder_anything = anything} in
1114   all_functions
1115