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Diffstat (limited to 'cil/src/ext/pta/uref.ml')
| -rw-r--r-- | cil/src/ext/pta/uref.ml | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/cil/src/ext/pta/uref.ml b/cil/src/ext/pta/uref.ml deleted file mode 100644 index 53f3640..0000000 --- a/cil/src/ext/pta/uref.ml +++ /dev/null @@ -1,94 +0,0 @@ -(* - * - * 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 - (q' := Ecr(x,qr+1); p' := Link q') - else if pr < qr then - (q' := Ecr(x,qr); p' := Link q') - else (* pr > qr *) - (p' := Ecr(x,pr); q' := Link p') - | _ -> 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 - - |