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\ Hypervisor Software File: makecent9.fth
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id: @(#)makecent9.fth 1.1 94/11/08
copyright: Copyright 1991-1994 Sun Microsystems, Inc.  All Rights Reserved

\ Processor-dependent code to create entry points to allow C code to call
\ Forth words.
\
\ make-c-entry  ( #args #returns acf -- entry-code-adr )
\
\	Creates an interface routine to allow the Forth word whose
\	compilation address is "acf" to be called from C.  #args is
\	the number of stack arguments expected by the Forth word,
\	and #results is the number of results returned on the stack.
\
\	#returns must be either 0 or 1, since C functions have at most 1
\	return value.

decimal

headerless
: make-c-entry  ( #args #returns acf -- c-entry-code-adr )
   align
   here >r              ( #args #returns acf )

   [ also assembler ]

   %o6 /entry-frame  %o6  save  \ Allocate space for locals, globals, stacks

   forth-entry call
   nop

   [ previous ]         ( #args #returns acf )

   token,               ( #args #returns )
   2drop                ( )
   compile return-to-c
   r>
;
: $c-entry  ( #args #results forth-acf C-name$ -- )
   2>r make-c-entry  origin-  2r>  ( entry-adr C-name$ )
   external-procedure $add-symbol
;
: $double-return-c-entry  ( #args #results forth-acf C-name$ -- )
   $c-entry
   ['] double-return-to-c here /token - token!
;
headers