Diff for /gforth/except.fs between versions 1.13 and 1.25

version 1.13, 2006/10/13 17:36:07 version 1.25, 2010/12/31 18:09:02
Line 1 Line 1
 \ catch, throw, etc.  \ catch, throw, etc.
   
 \ Copyright (C) 1999,2000,2003 Free Software Foundation, Inc.  \ Copyright (C) 1999,2000,2003,2006,2007,2010 Free Software Foundation, Inc.
   
 \ This file is part of Gforth.  \ This file is part of Gforth.
   
 \ Gforth is free software; you can redistribute it and/or  \ Gforth is free software; you can redistribute it and/or
 \ modify it under the terms of the GNU General Public License  \ modify it under the terms of the GNU General Public License
 \ as published by the Free Software Foundation; either version 2  \ as published by the Free Software Foundation, either version 3
 \ of the License, or (at your option) any later version.  \ of the License, or (at your option) any later version.
   
 \ This program is distributed in the hope that it will be useful,  \ This program is distributed in the hope that it will be useful,
Line 15 Line 15
 \ GNU General Public License for more details.  \ GNU General Public License for more details.
   
 \ You should have received a copy of the GNU General Public License  \ You should have received a copy of the GNU General Public License
 \ along with this program; if not, write to the Free Software  \ along with this program. If not, see http://www.gnu.org/licenses/.
 \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.  
   
 \ !! use a separate exception stack?           anton  \ !! use a separate exception stack?           anton
   
 \ user-definable rollback actions  
   
 Defer 'catch  
 Defer 'throw  
   
 ' noop IS 'catch  
 ' noop IS 'throw  
   
 \ has? backtrace [IF]  \ has? backtrace [IF]
 Defer store-backtrace  Defer store-backtrace
 ' noop IS store-backtrace  ' noop IS store-backtrace
Line 84  Variable first-throw Line 75  Variable first-throw
     \G backtrace.      \G backtrace.
     first-throw on ;      first-throw on ;
   
   : (try0) ( -- aoldhandler )
       first-throw on
       handler @ ;
   
   [undefined] (try1) [if]
   : (try1) ( aoldhandler arecovery -- anewhandler )
       r>
       swap >r \ recovery address
       sp@ cell+ >r
       fp@ >r
       lp@ >r
       swap >r \ old handler
       rp@ swap \ new handler
       >r ;
   [endif]
   
   : (try2)
       handler ! ;
   
 : (try) ( ahandler -- )  : (try) ( ahandler -- )
     first-throw on      first-throw on
     r>      r>
     swap >r \ recovery address      swap >r \ recovery address
     rp@ 'catch >r  
     sp@ >r      sp@ >r
     fp@ >r      fp@ >r
     lp@ >r      lp@ >r
Line 96  Variable first-throw Line 105  Variable first-throw
     rp@ handler !      rp@ handler !
     >r ;      >r ;
   
 : 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
   \     r> POSTPONE literal POSTPONE (try) ; immediate compile-only
   
   : try ( compilation  -- orig ; run-time  -- R:sys1 ) \ gforth
       \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      POSTPONE (try0) r> POSTPONE literal POSTPONE (try1) POSTPONE (try2)
   ; immediate compile-only
   
 : (recover) ( -- )  
   : (endtry) ( -- )
     \ normal end of try block: restore handler, forget rest      \ normal end of try block: restore handler, forget rest
     r>      r>
     r> handler !      r> handler !
     rdrop \ lp      rdrop \ lp
     rdrop \ fp      rdrop \ fp
     rdrop \ sp      rdrop \ sp
     r> rp!  
     rdrop \ recovery address      rdrop \ recovery address
     >r ;      >r ;
   
 : recover ( compilation  orig1 -- orig2 ; run-time  -- ) \ gforth  : handler-intro, ( -- )
     \ !! check using a special tag  
     POSTPONE (recover)  
     POSTPONE else  
     docol: here 0 , 0 , code-address! \ start a colon def       docol: here 0 , 0 , code-address! \ start a colon def 
     postpone rdrop                    \ drop the return address      postpone rdrop                    \ drop the return address
   ;
   
   : iferror ( compilation  orig1 -- orig2 ; run-time  -- ) \ gforth
       \G Starts the exception handling code (executed if there is an
       \G exception between @code{try} and @code{endtry}).  This part has
       \G to be finished with @code{then}.
       \ !! check using a special tag
       POSTPONE else handler-intro,
   ; immediate compile-only
   
   : restore ( compilation  orig1 -- ; run-time  -- ) \ gforth
       \G Starts restoring code, that is executed if there is an
       \G exception, and if there is no exception.
       POSTPONE iferror POSTPONE then
 ; immediate compile-only  ; immediate compile-only
   
 : endtry ( compilation  orig -- ; run-time  -- ) \ gforth  : endtry ( compilation  -- ; run-time  R:sys1 -- ) \ gforth
     POSTPONE then ; immediate compile-only      \G End an exception-catching region.
       POSTPONE (endtry)
   ; immediate compile-only
   
   : endtry-iferror ( compilation  orig1 -- orig2 ; run-time  R:sys1 -- ) \ gforth
       \G End an exception-catching region while starting
       \G exception-handling code outside that region (executed if there
       \G is an exception between @code{try} and @code{endtry-iferror}).
       \G This part has to be finished with @code{then} (or
       \G @code{else}...@code{then}).
       POSTPONE (endtry) POSTPONE iferror POSTPONE (endtry)
   ; immediate compile-only
   
 :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
     recover      iferror
         nip          nip
     endtry ;      then endtry ;
 is catch  is catch
   
   [undefined] (throw1) [if]
   : (throw1) ( ... ball frame -- ... ball )
       dup rp! ( ... ball frame )
       cell+ dup @ lp!
       cell+ dup @ fp!
       cell+ dup @ ( ... ball addr sp ) -rot 2>r sp! drop 2r>
       cell+ @ perform ;
   [endif]
       
 :noname ( y1 .. ym error/0 -- y1 .. ym / z1 .. zn error ) \ exception  :noname ( y1 .. ym error/0 -- y1 .. ym / z1 .. zn error ) \ exception
     ?DUP IF      ?DUP IF
         [ here forthstart 9 cells + ! ]          [ here forthstart 9 cells + ! ]
Line 143  is catch Line 189  is catch
             2 (bye)              2 (bye)
 \           quit  \           quit
         THEN          THEN
         rp!          \ cr .s dup 64 dump
         r> handler !          (throw1)
         r> lp!  
         r> fp!  
         r> swap >r sp! drop r>  
         rdrop 'throw r> perform  
     THEN ;      THEN ;
 is throw  is throw
 [IFDEF] rethrow  
 :noname ( y1 .. ym error/0 -- y1 .. ym / z1 .. zn error ) \ exception  
     ?DUP IF  
         handler @ ?dup-0=-IF  
             >stderr cr ." uncaught exception: " .error cr  
             2 (bye)  
 \           quit  
         THEN  
         rp!  
         r> handler !  
         r> lp!  
         r> fp!  
         r> swap >r sp! drop r>  
         rdrop 'throw r> perform  
     THEN ;  
 is rethrow  
 [THEN]  
   

Removed from v.1.13  
changed lines
  Added in v.1.25


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