66 lines
2.3 KiB
OCaml
66 lines
2.3 KiB
OCaml
(* $OpenBSD: randomvars.ml,v 1.2 2006/05/28 15:44:14 avsm Exp $ *)
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(*
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* Copyright (c) 2005 Anil Madhavapeddy <anil@recoil.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* $Id: randomvars.ml,v 1.2 2006/05/28 15:44:14 avsm Exp $
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*)
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(* introduce log messages to trace kernel messages *)
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open Pretty
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open Cil
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module E = Errormsg
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class randomVarsVisitor f = object
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inherit nopCilVisitor
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method vfunc fundec =
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(* make list of local variables which we will erase as
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* they are initialized *)
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let locals = ref fundec.slocals in
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let stmts = List.fold_left (fun a v -> match v.vtype with
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|TInt (ik,_) ->
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let ie = kinteger64 ik (Int64.max_int) in
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mkStmt (Instr[Set(var v,ie,!currentLoc)]) :: a
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|TArray (ty,exp,_) ->
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let expify fundec = Lval(Var(fundec.svar), NoOffset) in
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let m = expify (emptyFunction "memset") in
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let addr = mkAddrOrStartOf (Var v, NoOffset) in
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let i = kinteger64 IUInt (Int64.max_int) in
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begin match exp with
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|Some sz ->
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let size = BinOp(Mult,(sizeOf ty),sz,(TInt(IUInt,[]))) in
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mkStmt (Instr[Call(None,m,[addr;i;size],locUnknown)]) :: a
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|None -> a
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end
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|_ -> a
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) [] fundec.slocals in
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fundec.sbody.bstmts <- stmts @ fundec.sbody.bstmts;
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ChangeTo(fundec)
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end
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let randomvars f =
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visitCilFileSameGlobals (new randomVarsVisitor f) f
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let feature : featureDescr =
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{ fd_name = "randomvars";
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fd_enabled = ref false;
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fd_description = "randomize values of uninitialized local variables";
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fd_extraopt = [];
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fd_doit = (function (f: file) -> randomvars f);
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fd_post_check = true;
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}
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