package goblint-cil

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in-package search v0.2.0

A front-end for the C programming language that facilitates program analysis and transformation

Install

Dune Dependency

github.com Readme Changelog Edit opam file Versions (11)

Authors

Maintainers

Sources

goblint-cil-2.0.4.tbz

sha256=adea96efdb7611a688849491b363bcd5fc1e1fb8d6a937185560faefb42dd9cb

sha512=b8d8d835e9425cbbd59aeb06ce457e110cbd91c982d99c51e5a24bd5b7b9362f545db32c33ac6abc87a02015f29c8dc19e97ceb756ae1aefc659914f3598df19

doc/src/goblint-cil.pta/uref.ml.html

Source file `uref.ml`

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(*

   Copyright (c) 2001-2002, 
    John Kodumal        <jkodumal@eecs.berkeley.edu>
   All rights reserved.
   
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are
   met:

   1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

   2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

   3. The names of the contributors may not be used to endorse or promote
   products derived from this software without specific prior written
   permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
   IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *)
exception Bad_find

type 'a urefC =
    Ecr of 'a * int
  | Link of 'a uref
and 'a uref = 'a urefC ref

let rec find p = 
  match !p with
    | Ecr _ -> p
    | Link p' ->
	let p'' = find p' 
	in p := Link p''; p''

let uref x = ref (Ecr(x,0))

let equal (p,p') = (find p == find p')

let deref p = 
  match ! (find p) with 
    | Ecr (x,_) -> x
    | _ -> raise Bad_find

let update (p,x) = 
  let p' = find p 
  in
    match !p' with
      | Ecr (_,rank) -> p' := Ecr(x,rank)
      | _ -> raise Bad_find
	  
let unify f (p,q) = 
  let p',q' = find p, find q in
    match (!p',!q') with 
      | (Ecr(px,pr),Ecr(qx,qr)) ->
	let x () = f(px,qx) in
	  if (p' == q') then
	    p' := Ecr(x (),pr)
	  else if pr == qr then
            (p' := Link q'; q' := Ecr(x (),qr+1))
	  else if pr < qr then
            (p' := Link q'; q' := Ecr(x (),qr))
	  else (* pr > qr *)
            (q' := Link p'; p' := Ecr(x (),pr))
      | _ -> raise Bad_find
	  
let union (p,q) = 
  let p',q' = find p, find q in
    match (!p',!q') with 
      | (Ecr(px,pr),Ecr(qx,qr)) ->
	  if (p' == q') then 
	    ()
	  else if pr == qr then
	    (q' := Ecr(qx, qr+1); p' := Link q')
	  else if pr < qr then
	    p' := Link q'
	  else (* pr > qr *)
	    q' := Link p'
      | _ -> raise Bad_find