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/*
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Crown Copyright (c) 1997
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This TenDRA(r) Computer Program is subject to Copyright
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owned by the United Kingdom Secretary of State for Defence
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acting through the Defence Evaluation and Research Agency
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(DERA). It is made available to Recipients with a
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royalty-free licence for its use, reproduction, transfer
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to other parties and amendment for any purpose not excluding
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product development provided that any such use et cetera
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shall be deemed to be acceptance of the following conditions:-
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(1) Its Recipients shall ensure that this Notice is
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reproduced upon any copies or amended versions of it;
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(2) Any amended version of it shall be clearly marked to
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show both the nature of and the organisation responsible
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for the relevant amendment or amendments;
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(3) Its onward transfer from a recipient to another
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party shall be deemed to be that party's acceptance of
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these conditions;
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(4) DERA gives no warranty or assurance as to its
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quality or suitability for any purpose and DERA accepts
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no liability whatsoever in relation to any use to which
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it may be put.
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*/
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/* 80x86/overlap.c */
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/**********************************************************************
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$Author: release $
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$Date: 1998/01/17 15:55:52 $
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$Revision: 1.1.1.1 $
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$Log: overlap.c,v $
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* Revision 1.1.1.1 1998/01/17 15:55:52 release
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* First version to be checked into rolling release.
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*
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* Revision 1.2 1995/01/30 12:56:41 pwe
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* Ownership -> PWE, tidy banners
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*
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* Revision 1.1 1994/10/27 14:15:22 jmf
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* Initial revision
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*
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* Revision 1.1 1994/07/12 14:39:22 jmf
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* Initial revision
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*
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**********************************************************************/
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#include "config.h"
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#include "common_types.h"
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#include "tags.h"
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#include "expmacs.h"
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#include "exp.h"
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#include "overlap.h"
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/* PROCEDURES */
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/* false if a value of shape sha at
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w1 cannot overlap with one at w2.
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true if it does or might overlap.
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only used by move, so we can assume
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that w1 and w2 are addressable.
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*/
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int might_overlap
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PROTO_N ( (sha, w1, w2) )
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PROTO_T ( shape sha X where w1 X where w2 )
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{
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exp e1 = w1.where_exp;
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exp e2 = w2.where_exp;
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exp i1, i2;
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int off1, off2, sz;
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if (name(e1) != name_tag) {
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if (name(e2) == name_tag && iscaonly(son(e2)))
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return 0;
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return 1;
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};
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if (name(e2) != name_tag) {
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if (name(e1) == name_tag && iscaonly(son(e1)))
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return 0;
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return 1;
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};
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/* both are name_tags */
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i1 = son(e1);
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i2 = son(e2);
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if (isglob(i1)) {
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if (i1 != i2)
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return 0;
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sz = shape_size(sha);
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off1 = no(e1) + w1.where_off;
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off2 = no(e2) + w2.where_off;
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if (off1 <= off2 && (off1 + sz) > off2)
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return 1;
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if (off2 <= off1 && (off2 + sz) > off1)
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return 1;
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return 0;
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};
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if (isglob(i2))
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return 0;
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/* both are local */
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if (ptno(i1) != ptno(i2))
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return 0;
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sz = shape_size(sha);
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off1 = no(e1) + no(i1) + w1.where_off;
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off2 = no(e2) + no(i2) + w2.where_off;
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if (off1 <= off2 && (off1 + sz) > off2)
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return 1;
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if (off2 <= off1 && (off2 + sz) > off1)
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return 1;
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return 0;
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}
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