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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/spec.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: spec.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 1.4 1995/09/06 16:29:32 pwe
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* exceptions now OK
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*
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* Revision 1.3 1995/09/05 16:25:12 pwe
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* specials and exception changes
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*
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* Revision 1.2 1995/01/30 12:56:51 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 1.2 1994/07/12 15:21:29 jmf
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* exit, abort and longjmp produce bottom shape.
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*
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* Revision 1.1 1994/07/12 14:41:19 jmf
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* Initial revision
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*
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**********************************************************************/
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/**********************************************************************
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spec.c
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Defines special_fn which recognises and replaces some special
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function calls.
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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 "externs.h"
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#include "expmacs.h"
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#include "shapemacs.h"
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#include "exp.h"
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#include "basicread.h"
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#include "flags.h"
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#include "table_fns.h"
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#include "installglob.h"
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#include "check.h"
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#include "localflags.h"
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#include "me_fns.h"
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#include "spec.h"
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/* PROCEDURES */
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speci special_fn
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PROTO_N ( (a1, a2, s) )
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PROTO_T ( exp a1 X exp a2 X shape s )
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{
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/* look for special functions */
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speci spr;
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dec* dp = brog (son (a1));
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char *id = dp -> dec_u.dec_val.dec_id;
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spr.is_special = 0;
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if (id == (char *) 0)
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return (spr);
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id += prefix_length;
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if (a2 != nilexp && last(a2) && !strcmp (id, "__trans386_special")) {
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exp r = me_b3(s, a1, a2, apply_tag);
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setbuiltin(r); /* dummy proc, so ignore state of do_special_fns */
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spr.is_special = 1;
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spr.special_exp = r;
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return (spr);
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};
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if (!strcmp (id, "setjmp")) {
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has_setjmp = 1;
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module_has_setjmp = 1;
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};
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if (!strcmp (id, "longjmp")) {
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exp r = getexp(f_bottom, nilexp, 0, a1, nilexp, 0, 0,apply_tag);
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has_setjmp = 1;
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if (last(a2) || bro(a2) == nilexp)
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return spr;
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bro(a1) = a2;
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clearlast(a1);
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parked(a2) = 0;
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clearlast(a2);
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a2 = bro(a2);
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setlast(a2);
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parked(a2) = 0;
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bro(a2) = r;
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spr.is_special = 1;
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spr.special_exp = r;
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};
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/* we must always set has_setjmp if it is longjmp,
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otherwise registers are not reset.
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so don't do do_special_fns test until after longjmp test. */
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if (!do_special_fns)
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return spr;
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if (a2 != nilexp && last(a2) && !strcmp (id, "__builtin_alloca")) {
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exp r = getexp (s, nilexp, 0, a2, nilexp, 0,
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0, alloca_tag);
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setfather(r, son(r));
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has_alloca = 1;
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spr.is_special = 1;
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spr.special_exp = r;
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kill_exp (a1, a1);
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return (spr);
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};
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if (a2 != nilexp && last(a2) && !strcmp (id, "exit")) {
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exp r = me_b3(f_bottom, a1, a2, apply_tag);
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spr.is_special = 1;
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spr.special_exp = r;
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return (spr);
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};
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if (a2 == nilexp && !strcmp (id, "abort")) {
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exp r = me_u3(f_bottom, a1, apply_tag);
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spr.is_special = 1;
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spr.special_exp = r;
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return (spr);
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};
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return (spr);
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}
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