version 1.17, 2007/02/18 18:30:51
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version 1.20, 2007/12/31 17:34:58
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\ catch, throw, etc. |
\ catch, throw, etc. |
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\ Copyright (C) 1999,2000,2003,2006 Free Software Foundation, Inc. |
\ Copyright (C) 1999,2000,2003,2006,2007 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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Line 87 Variable first-throw
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Line 87 Variable first-throw
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rp@ handler ! |
rp@ handler ! |
>r ; |
>r ; |
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: try ( compilation -- orig ; run-time -- ) \ gforth |
: try ( compilation -- orig ; run-time -- R:sys1 ) \ gforth |
\ !! does not work correctly for gforth-native |
\G Start an exception-catching region. |
POSTPONE ahead here >r >mark 1 cs-roll POSTPONE then |
POSTPONE ahead here >r >mark 1 cs-roll POSTPONE then |
r> POSTPONE literal POSTPONE (try) ; immediate compile-only |
r> POSTPONE literal POSTPONE (try) ; immediate compile-only |
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Line 108 Variable first-throw
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Line 108 Variable first-throw
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; |
; |
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: iferror ( compilation orig1 -- orig2 ; run-time -- ) \ gforth |
: iferror ( compilation orig1 -- orig2 ; run-time -- ) \ gforth |
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\G Starts the exception handling code (executed if there is an |
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\G exception between @code{try} and @code{endtry}). This part has |
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\G to be finished with @code{then}. |
\ !! check using a special tag |
\ !! check using a special tag |
POSTPONE else handler-intro, |
POSTPONE else handler-intro, |
; immediate compile-only |
; immediate compile-only |
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: restore ( compilation orig1 -- ; run-time -- ) \ gforth |
: restore ( compilation orig1 -- ; run-time -- ) \ gforth |
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\G Starts restoring code, that is executed if there is an |
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\G exception, and if there is no exception. |
POSTPONE iferror POSTPONE then |
POSTPONE iferror POSTPONE then |
; immediate compile-only |
; immediate compile-only |
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: endtry ( compilation -- ; run-time -- ) \ gforth |
: endtry ( compilation -- ; run-time R:sys1 -- ) \ gforth |
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\G End an exception-catching region. |
POSTPONE (endtry) |
POSTPONE (endtry) |
; immediate compile-only |
; immediate compile-only |
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: endtry-iferror ( compilation orig1 -- orig2 ; run-time R:sys1 -- ) \ gforth |
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\G End an exception-catching region while starting |
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\G exception-handling code outside that region (executed if there |
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\G is an exception between @code{try} and @code{endtry-iferror}). |
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\G This part has to be finished with @code{then} (or |
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\G @code{else}...@code{then}). |
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POSTPONE (endtry) POSTPONE iferror POSTPONE (endtry) |
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; immediate compile-only |
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:noname ( x1 .. xn xt -- y1 .. ym 0 / z1 .. zn error ) \ exception |
:noname ( x1 .. xn xt -- y1 .. ym 0 / z1 .. zn error ) \ exception |
try |
try |
execute 0 |
execute 0 |
Line 140 is catch
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Line 155 is catch
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2 (bye) |
2 (bye) |
\ quit |
\ quit |
THEN |
THEN |
dup rp! |
dup rp! ( ... ball frame ) |
rdrop |
cell+ dup @ lp! |
r> lp! |
cell+ dup @ fp! |
r> fp! |
cell+ dup @ ( ... ball addr sp ) -rot 2>r sp! drop 2r> |
r> -rot 2>r sp! drop 2r> |
cell+ @ perform |
r@ swap rp! perform |
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THEN ; |
THEN ; |
is throw |
is throw |