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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/is_worth.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: is_worth.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 12:56:29 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 1.5 1994/07/15 13:58:07 jmf
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* Admit global real consts. Safeguard father.
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*
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* Revision 1.4 1994/07/12 15:13:07 jmf
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* protected father for test_tag
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*
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* Revision 1.3 1994/07/12 15:12:11 jmf
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* Replaced keywords
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*
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* Revision 1.1 1994/07/12 14:35:40 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 "shapemacs.h"
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#include "is_worth.h"
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/* PROCEDURES */
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int is_worth
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PROTO_N ( (c) )
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PROTO_T ( exp c )
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{
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/* decide if constant c is worth declaring
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separately */
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unsigned char cnam = name (c);
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if (name(sh(c)) == realhd && cnam == cont_tag &&
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name(son(c)) == name_tag && isvar(son(son(c))) &&
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isglob(son(son(c))))
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return 1;
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if (cnam == cont_tag && name(son(c)) == name_tag &&
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!isvar(son(son(c)))) {
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return 1;
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}
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return ((!is_o (cnam) && cnam != clear_tag &&
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cnam != int_to_bitf_tag && cnam != bitf_to_int_tag) ||
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/* ignore simple things unless ... */
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(cnam == cont_tag && name (son (c)) == cont_tag &&
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name (son (son (c))) == name_tag)
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|| (cnam == name_tag &&
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(isloadparam(son(c)) || isparam(son(c))) &&
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!isvar(son(c)) &&
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shape_size(sh(c)) <= 32
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&& name(sh(c)) != shrealhd
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)
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|| (cnam == cont_tag && name(son(c)) == name_tag &&
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isvar(son(son(c))) && isglob(son(son(c))) &&
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((last(c) && bro(c) != nilexp) ||
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(!last(c) && last(bro(c)) && bro(bro(c)) != nilexp)) &&
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name(father(c)) == test_tag)
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);
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}
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