| 1 | (* *********************************************************************) |
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| 2 | (* *) |
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| 3 | (* The Compcert verified compiler *) |
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| 4 | (* *) |
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| 5 | (* Xavier Leroy, INRIA Paris-Rocquencourt *) |
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| 6 | (* *) |
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| 7 | (* Copyright Institut National de Recherche en Informatique et en *) |
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| 8 | (* Automatique. All rights reserved. This file is distributed *) |
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| 9 | (* under the terms of the GNU General Public License as published by *) |
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| 10 | (* the Free Software Foundation, either version 2 of the License, or *) |
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| 11 | (* (at your option) any later version. This file is also distributed *) |
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| 12 | (* under the terms of the INRIA Non-Commercial License Agreement. *) |
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| 13 | (* *) |
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| 14 | (* *********************************************************************) |
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| 15 | |
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| 16 | (* Generic program transformation *) |
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| 17 | |
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| 18 | open C |
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| 19 | open Cutil |
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| 20 | open Env |
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| 21 | |
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| 22 | (* Recording fresh temporaries *) |
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| 23 | |
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| 24 | let temporaries = ref ([]: decl list) |
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| 25 | |
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| 26 | let reset_temps () = |
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| 27 | temporaries := [] |
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| 28 | |
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| 29 | let new_temp_var ?(name = "t") ty = |
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| 30 | let id = Env.fresh_ident name in |
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| 31 | temporaries := (Storage_default, id, ty, None) :: !temporaries; |
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| 32 | id |
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| 33 | |
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| 34 | let new_temp ?(name = "t") ty = |
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| 35 | let id = new_temp_var ~name ty in |
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| 36 | { edesc = EVar id; etyp = ty } |
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| 37 | |
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| 38 | let get_temps () = |
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| 39 | let temps = !temporaries in |
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| 40 | temporaries := []; |
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| 41 | List.rev temps |
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| 42 | |
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| 43 | (* Generic transformation *) |
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| 44 | |
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| 45 | let program |
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| 46 | ?(decl = fun env d -> d) |
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| 47 | ?(fundef = fun env fd -> fd) |
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| 48 | ?(composite = fun env su id fl -> fl) |
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| 49 | ?(typedef = fun env id ty -> ty) |
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| 50 | p = |
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| 51 | |
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| 52 | (* In all transformations of interest so far, the environment is used only |
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| 53 | for its type definitions and struct/union definitions, |
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| 54 | so we do not update it for other definitions. *) |
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| 55 | |
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| 56 | let rec transf_globdecls env accu = function |
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| 57 | | [] -> List.rev accu |
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| 58 | | g :: gl -> |
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| 59 | let (desc', env') = |
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| 60 | match g.gdesc with |
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| 61 | | Gdecl((sto, id, ty, init) as d) -> |
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| 62 | (Gdecl(decl env d), Env.add_ident env id sto ty) |
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| 63 | | Gfundef f -> |
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| 64 | (Gfundef(fundef env f), |
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| 65 | Env.add_ident env f.fd_name f.fd_storage (fundef_typ f)) |
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| 66 | | Gcompositedecl(su, id) -> |
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| 67 | (Gcompositedecl(su, id), |
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| 68 | Env.add_composite env id (composite_info_decl env su)) |
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| 69 | | Gcompositedef(su, id, fl) -> |
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| 70 | (Gcompositedef(su, id, composite env su id fl), |
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| 71 | Env.add_composite env id (composite_info_def env su fl)) |
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| 72 | | Gtypedef(id, ty) -> |
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| 73 | (Gtypedef(id, typedef env id ty), Env.add_typedef env id ty) |
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| 74 | | Genumdef _ as gd -> (gd, env) |
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| 75 | | Gpragma _ as gd -> (gd, env) |
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| 76 | in |
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| 77 | transf_globdecls env' ({g with gdesc = desc'} :: accu) gl |
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| 78 | |
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| 79 | in transf_globdecls (Builtins.environment()) [] p |
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