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Re: The most severe ghostscript error I've been able to conjure so far

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luser- -droog wrote:

> Here it is. Kablooey!
> Look, you can see the flags!
> 
> 520(1)10:35 PM:ps 0> vi currot.ps
> 
> GPL Ghostscript 8.62 (2008-02-29)
> Copyright (C) 2008 Artifex Software, Inc.  All rights reserved.
> This software comes with NO WARRANTY: see the file PUBLIC for details.
> Unrecoverable error: stackunderflow in exch
> Operand stack:
>     --nostringval--
> 
> Unexpected interpreter error -17.
> Error object: (f80)op(4:exch)0xb787ba60
> Operand stack at 0x8f68fb8:
> 0x8f5d5e4: 0x02 dict --Lwrx--- 0x0018 0x08f5acf8
> Execution stack at 0x8f68f7c:
> 0x8f5ef4c: 0x0f oper --F---e-- 0x0000 0xb785e800 = %interp_exit
> 0x8f5ef54: 0x0d name --S---e-- 0x0307 0x08f4cd98 = .runexec2
> 0x8f5ef5c: 0x03 file --S-rx--- 0x0001 0x08faa328
> 0x8f5ef64: 0x05 mpry --G-rxe-- 0x0006 0x08f8202c
> 0x8f5ef6c: 0x0e null --F---e-- 0x0003 0xb786e480
> 0x8f5ef74: 0x0e null --F------ 0xbffc 0xbffc2ff8
> 0x8f5ef7c: 0x0b int  --F------ 0x0002 0x00000002 = 2
> 0x8f5ef84: 0x0f oper --F---e-- 0x0000 0xb786e410 = %stopped_push
> 0x8f5ef8c: 0x03 file --S-rxe-- 0x0001 0x08faa328
> 0x8f5ef94: 0x05 mpry --G-rxe-- 0x0002 0x08f82aec
> 0x8f5ef9c: 0x05 mpry --G-rxe-- 0x0007 0x08f82ac0
> 0x8f5efa4: 0x0e null --F---e-- 0x0003 0xb786e480
> 0x8f5efac: 0x01 bool --F------ 0x0001 0x08fa0000 = false
> 0x8f5efb4: 0x0b int  --F------ 0x0000 0x00000001 = 1
> 0x8f5efbc: 0x0f oper --F---e-- 0x0000 0xb786e410 = %stopped_push
> 0x8f5efc4: 0x0e null --F---e-- 0x0000 0xb785ead0
> 0x8f5efcc: 0x0b int  --F------ 0x0000 0x00000771 = 1905
> 0x8f5efd4: 0x0b int  --F------ 0x0000 0x00000001 = 1
> 0x8f5efdc: 0x0b int  --F------ 0x0000 0x00000003 = 3
> 0x8f5efe4: 0x0f oper --F---e-- 0x0000 0xb785e810 = %oparray_pop
> 0x8f5efec: 0x0e null --F---e-- 0x0000 0xb785ead0
> 0x8f5eff4: 0x0b int  --F------ 0x0005 0x00000770 = 1904
> 0x8f5effc: 0x0b int  --F------ 0x0002 0x00000001 = 1
> 0x8f5f004: 0x0b int  --F------ 0x0000 0x00000003 = 3
> 0x8f5f00c: 0x0f oper --F---e-- 0x0000 0xb785e810 = %oparray_pop
> 0x8f5f014: 0x0e null --F---e-- 0x0000 0xb785ead0
> 0x8f5f01c: 0x0b int  --F------ 0x0000 0x00000760 = 1888
> 0x8f5f024: 0x0b int  --F------ 0x0000 0x00000001 = 1
> 0x8f5f02c: 0x0b int  --F------ 0x0003 0x00000003 = 3
> 0x8f5f034: 0x0f oper --F---e-- 0x0000 0xb785e810 = %oparray_pop
> 0x8f5f03c: 0x0e null --F---e-- 0x0000 0xb785ead0
> 0x8f5f044: 0x0b int  --F------ 0x0002 0x000006eb = 1771
> 0x8f5f04c: 0x0b int  --F------ 0x000e 0x00000001 = 1
> 0x8f5f054: 0x0b int  --F------ 0x0000 0x00000003 = 3
> 0x8f5f05c: 0x0f oper --F---e-- 0x0000 0xb785e810 = %oparray_pop
> 0x8f5f064: 0x0e null --F---e-- 0x0000 0xb785e860
> 0x8f5f06c: 0x0e null --F------ 0xbffc 0xbffc2ff8
> 0x8f5f074: 0x0f oper --F---e-- 0x0000 0xb785e840 = %errorexec_pop
> 0x8f5f07c: 0x0d name --S---e-- 0x0307 0x08f4cd98 = .runexec2
> 0x8f5f084: 0x03 file --S-rx--- 0x0001 0x08faa418
> 0x8f5f08c: 0x05 mpry --G-rxe-- 0x0006 0x08f8202c
> 0x8f5f094: 0x0e null --F---e-- 0x0003 0xb786e480
> 0x8f5f09c: 0x0e null --F------ 0xbffc 0xbffc2ff8
> 0x8f5f0a4: 0x0b int  --F------ 0x0002 0x00000002 = 2
> 0x8f5f0ac: 0x0f oper --F---e-- 0x0000 0xb786e410 = %stopped_push
> 0x8f5f0b4: 0x03 file --S-rxe-- 0x0001 0x08faa418
> 0x8f5f0bc: 0x04 arry -nLwrxe-- 0x0001 0x09187d80
> 0x8f5f0c4: 0x0e null --F---e-- 0x0002 0xb786e480
> 0x8f5f0cc: 0x04 arry -nLwrxe-- 0x000a 0x09187bf4
> 0x8f5f0d4: 0x0f oper --F---e-- 0x0000 0xb786e3d0 = %loop_continue
> 0x8f5f0dc: 0x05 mpry --G-rxe-- 0x002a 0x08f82f98
> 0x8f5f0e4: 0x05 mpry --G-rxe-- 0x003f 0x08f82f6e
> Dictionary stack at 0x8f68f24:
> 0x8f68bec: 0x02 dict --Gwrx--- 0x0000 0x08f4f73c
> 0x8f68bf4: 0x02 dict --Gwrx--- 0x0000 0x08fadb60
> 0x8f68bfc: 0x02 dict --Lwrx--- 0x0000 0x08f59ea8
> 0x8f68c04: 0x02 dict -nLwrx--- 0xb787 0x09187e1c
> 
> shell returned 255
> 
> Press ENTER or type command to continue
> 
> 
> Now, can anyone tell what I did wrong?
> I'll wait 24 hours before saying what I think.
> We'll make a little contest out of it.
> Related question: What's the "correct" way
> to explicitly invoke the error mechanism?
> 
> 
> %!
> 
> /resolve {
>     6 dict begin
>     matrix currentmatrix
>     matrix defaultmatrix
>     matrix invertmatrix
>     matrix concatmatrix aload pop
>     /ty exch def
>     /tx exch def
>     /d exch def
>     /c exch def
>     /b exch def
>     /a exch def
>     {
>         a d ne
>         b neg c ne or
>         { errordict /undefinedresult get exec } if
>     } loop
>     end
> } def
> 
> 1 2 scale
> resolve

I replaced the line
        { errordict /undefinedresult get exec } if
by
        {(this is an object) errordict/undefinedresult get exec} if
and got the result

Error: /undefinedresult in (this is an object)
Operand stack:

Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --
nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --
nostringval--   false   1   %stopped_push   1941   1   3   %oparray_pop   
1835   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   
--nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --
nostringval--   --nostringval--   --nostringval--   %loop_continue
Dictionary stack:
   --dict:1181/1684(ro)(G)--   --dict:0/20(G)--   --dict:80/200(L)--   --
dict:6/6(L)--
Current allocation mode is local
Last OS error: 2
Current file position is 594
GPL Ghostscript 9.05: Unrecoverable error, exit code 1


BTW, the "correct" way of calling the error handler with Ghostscript is

error_object /error_name signalerror .

Helge

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The most severe ghostscript error I've been able to conjure so far luser- -droog <mijoryx@yahoo.com> - 2012-08-12 20:56 -0700
  Re: The most severe ghostscript error I've been able to conjure so far tlvp <mPiOsUcB.EtLlLvEp@att.net> - 2012-08-13 01:53 -0400
  Re: The most severe ghostscript error I've been able to conjure so far Helge Blischke <h.blischke@acm.org> - 2012-08-13 16:34 +0200
    Re: The most severe ghostscript error I've been able to conjure so far luser- -droog <mijoryx@yahoo.com> - 2012-08-13 15:14 -0700
  Re: The most severe ghostscript error I've been able to conjure so far luser- -droog <mijoryx@yahoo.com> - 2012-08-22 03:31 -0700

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