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\ Hypervisor Software File: trace.fth
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id: @(#)trace.fth 1.3 94/09/06
purpose: Debugging tool - traces package calls
copyright: Copyright 1990 Sun Microsystems, Inc.  All Rights Reserved

\ Debugging tool for packages.
\   trace-on   ( -- )	Turns on package call tracing
\   trace-off  ( -- )	Turns off package call tracing
\
\ Tracing displays the stack contents, the name of the called package,
\ and the name of the called method each time that a package method is
\ invoked.  Calls to the stdin and stdout packages are not traced, as
\ doing so results in a screenful of hard-to-decipher messages.
headerless
: (trace)  ( adr len phandle -- adr len phandle )
   >r  >r >r  .s  r> r>           ( adr len )  ( r: phandle )
   also  r@ execute               ( adr len )  ( r: phandle )
   " name" get-property           ( adr len value-str false )  ( r: phandle )
   previous                       ( adr len value-str false )  ( r: phandle )
   drop get-encoded-string  type  ( adr len )  ( r: phandle )
   ." : "  2dup type space  cr    ( adr len )  ( r: phandle )
   r>                             ( adr len phandle )
;
: (safe-trace)  ( adr len phandle -- adr len phandle )
   dup   stdout @ pihandle=              ( adr len phandle flag )
   over  stdin  @ pihandle=  or  0=  if  ( adr len phandle )
      (trace)
   then
;
headers
: trace-on  ( -- )  ['] (safe-trace) is fm-hook  ;
: trace-off ( -- )  ['] noop is fm-hook  ;