1 ! :folding=indent:collapseFolds=1:
5 ! Copyright (C) 2004 Slava Pestov.
7 ! Redistribution and use in source and binary forms, with or without
8 ! modification, are permitted provided that the following conditions are met:
10 ! 1. Redistributions of source code must retain the above copyright notice,
11 ! this list of conditions and the following disclaimer.
13 ! 2. Redistributions in binary form must reproduce the above copyright notice,
14 ! this list of conditions and the following disclaimer in the documentation
15 ! and/or other materials provided with the distribution.
17 ! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
18 ! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
19 ! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
20 ! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 ! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 ! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 ! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 ! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
25 ! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
26 ! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43 ! This is a very lightweight exception handling system.
45 : catchstack* ( -- cs ) 6 getenv ;
46 : catchstack ( -- cs ) catchstack* clone ;
47 : set-catchstack* ( cs -- ) 6 setenv ;
48 : set-catchstack ( cs -- ) clone set-catchstack* ;
50 : kernel-error? ( obj -- ? )
51 dup cons? [ car fixnum? ] [ drop f ] ifte ;
53 : ?nth ( n list -- obj )
54 over [ dup >r length min 0 max r> nth ] [ 2drop f ] ifte ;
64 "Incompatible handle: "
67 "Incomparable types: "
70 : ?kernel-error ( cons -- error# param )
71 dup cons? [ uncons dup cons? [ car ] when ] [ f ] ifte ;
73 : kernel-error. ( error -- )
74 ?kernel-error swap error# dup "" ? write
75 dup [ . ] [ drop terpri ] ifte ;
77 : error. ( error -- str )
78 dup kernel-error? [ kernel-error. ] [ . ] ifte ;
82 DEFER: default-error-handler
85 64 <vector> set-catchstack*
86 [ 1 exit* ] >c ( last resort )
87 [ default-error-handler 1 exit* ] >c
88 [ throw ] 5 setenv ( kernel calls on error ) ;