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\ *****************************************************************************
\ * Copyright (c) 2004, 2008 IBM Corporation
\ * All rights reserved.
\ * This program and the accompanying materials
\ * are made available under the terms of the BSD License
\ * which accompanies this distribution, and is available at
\ * http://www.opensource.org/licenses/bsd-license.php
\ *
\ * Contributors:
\ * IBM Corporation - initial implementation
\ ****************************************************************************/
: ?offset16 ( -- true|false )
fcode-offset 2 =
;
: ?arch64 ( -- true|false )
cell 8 =
;
: ?bigendian ( -- true|false )
deadbeef fcode-num !
fcode-num ?arch64 IF 4 + THEN
c@ de =
;
: reset-fcode-end ( -- )
false fcode-end !
;
: get-ip ( -- n )
ip @
;
: set-ip ( n -- )
ip !
;
: next-ip ( -- )
get-ip 1+ set-ip
;
: jump-n-ip ( n -- )
get-ip + set-ip
;
: read-byte ( -- n )
get-ip fcode-rb@
;
: ?compile-mode ( -- on|off )
state @
;
: save-evaluator-state
get-ip eva-debug? IF ." saved ip " dup . cr THEN
fcode-end @ eva-debug? IF ." saved fcode-end " dup . cr THEN
fcode-offset eva-debug? IF ." saved fcode-offset " dup . cr THEN
\ local fcodes are currently NOT saved!
fcode-spread eva-debug? IF ." saved fcode-spread " dup . cr THEN
['] fcode@ behavior eva-debug? IF ." saved fcode@ " dup . cr THEN
;
: restore-evaluator-state
eva-debug? IF ." restored fcode@ " dup . cr THEN to fcode@
eva-debug? IF ." restored fcode-spread " dup . cr THEN to fcode-spread
\ local fcodes are currently NOT restored!
eva-debug? IF ." restored fcode-offset " dup . cr THEN to fcode-offset
eva-debug? IF ." restored fcode-end " dup . cr THEN fcode-end !
eva-debug? IF ." restored ip " dup . cr THEN set-ip
;
: token-table-index ( fcode# -- addr )
cells token-table +
;
: join-immediate ( xt immediate? addr -- xt+immediate? addr )
-rot + swap
;
: split-immediate ( xt+immediate? -- xt immediate? )
dup 1 and 2dup - rot drop swap
;
: literal, ( n -- )
postpone literal
;
: fc-string,
postpone sliteral
dup c, bounds ?do i c@ c, loop
;
: set-token ( xt immediate? fcode# -- )
token-table-index join-immediate !
;
: get-token ( fcode# -- xt immediate? )
token-table-index @ split-immediate
;
( ---------------------------------------------------- )
#include "little-big.fs"
( ---------------------------------------------------- )
: read-fcode# ( -- FCode# )
read-byte
dup 01 0F between IF drop read-fcode-num16 THEN
;
: read-header ( adr -- )
next-ip read-byte drop
next-ip read-fcode-num16 drop
next-ip read-fcode-num32 drop
;
: read-fcode-string ( -- str len )
read-byte \ get string length ( -- len )
next-ip get-ip \ get string addr ( -- len str )
swap \ type needs the parameters swapped ( -- str len )
dup 1- jump-n-ip \ jump to the end of the string in FCode
;
-1 VALUE break-fcode-addr
0 VALUE break-fcode-steps
: evaluate-fcode ( -- )
BEGIN
get-ip break-fcode-addr = IF
TRUE fcode-end !
THEN
fcode-end @ 0=
WHILE
fcode@ ( fcode# )
eva-debug? IF
dup
get-ip 8 u.r ." : "
." [" 3 u.r ." ] "
THEN
\ When it is not immediate and in compile-mode, then compile
get-token 0= ?compile-mode AND IF ( xt )
compile,
ELSE \ immediate or "interpretation" mode
eva-debug? IF dup xt>name type space THEN
execute
THEN
eva-debug? IF .s cr THEN
break-fcode-steps IF
break-fcode-steps 1- TO break-fcode-steps
break-fcode-steps 0= IF
TRUE fcode-end !
THEN
THEN
next-ip
REPEAT
;
\ Run FCODE for n steps
: steps-fcode ( n -- )
to break-fcode-steps
break-fcode-addr >r -1 to break-fcode-addr
reset-fcode-end
evaluate-fcode
r> to break-fcode-addr
;
\ Step through one FCODE instruction
: step-fcode ( -- )
1 steps-fcode
;
|
