version 1.19, 2002/12/13 21:20:39
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version 1.24, 2003/01/19 23:35:30
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Line 1
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Line 1
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\ LOOK.FS xt -> lfa 22may93jaw |
\ LOOK.FS xt -> lfa 22may93jaw |
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\ Copyright (C) 1995,1996,1997,2000 Free Software Foundation, Inc. |
\ Copyright (C) 1995-2003 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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Line 41 decimal
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Line 41 decimal
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@ |
@ |
then ; |
then ; |
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: (look) ( xt startlfa -- lfa flag ) |
: search-name ( xt startlfa -- nt|0 ) |
swap decompile-prim false rot |
\ look up name of primitive with code at xt |
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swap |
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>r false swap |
BEGIN |
BEGIN |
@ dup |
@ dup |
WHILE |
WHILE |
dup name>int xt>threaded |
dup name>int |
3 pick = IF |
r@ = IF |
nip dup |
nip dup |
THEN |
THEN |
REPEAT |
REPEAT |
drop nip |
drop rdrop ; |
dup 0<> ; |
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: threaded>xt ( ca -- xt|0 ) |
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\G For the code address ca of a primitive, find the xt (or 0). |
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[IFDEF] decompile-prim |
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decompile-prim |
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[THEN] |
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\ walk through the array of primitive CAs |
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>r ['] noop begin |
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dup @ while |
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dup xt>threaded r@ = if |
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rdrop exit |
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endif |
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cell+ |
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repeat |
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drop rdrop 0 ; |
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\ !!! nicht optimal! |
\ !!! nicht optimal! |
[IFUNDEF] look |
[IFUNDEF] look |
Line 61 has? ec [IF]
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Line 76 has? ec [IF]
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has? rom |
has? rom |
[IF] |
[IF] |
: look |
: prim>name ( xt -- nt|0 ) |
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forth-wordlist @ search-name ; |
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: look ( xt -- lfa flag ) |
dup [ unlock rom-dictionary area lock ] |
dup [ unlock rom-dictionary area lock ] |
literal literal within |
literal literal within |
IF |
IF |
>head-noprim dup ?? <> |
>head-noprim dup ?? <> |
ELSE |
ELSE |
forth-wordlist @ (look) |
prim>name dup 0<> |
THEN ; |
THEN ; |
[ELSE] |
[ELSE] |
: look ( cfa -- lfa flag ) |
: look ( cfa -- lfa flag ) |
Line 78 has? rom
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Line 96 has? rom
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: PrimStart ['] true >head-noprim ; |
: PrimStart ['] true >head-noprim ; |
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: look ( cfa -- lfa flag ) |
: prim>name ( xt -- nt|0 ) |
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PrimStart search-name ; |
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: look ( xt -- lfa flag ) |
dup in-dictionary? |
dup in-dictionary? |
IF |
IF |
>head-noprim dup ??? <> |
>head-noprim dup ??? <> |
ELSE |
ELSE |
PrimStart (look) |
prim>name dup 0<> |
THEN ; |
THEN ; |
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[THEN] |
[THEN] |
[THEN] |
[THEN] |
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: threaded>name ( ca -- nt|0 ) |
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threaded>xt prim>name ; |
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: >head ( cfa -- nt|0 ) \ gforth to-head |
: >head ( cfa -- nt|0 ) \ gforth to-head |
\G tries to find the name token nt of the word represented by cfa; |
\G tries to find the name token nt of the word represented by cfa; |
\G returns 0 if it fails. This word is not absolutely reliable, |
\G returns 0 if it fails. This word is not absolutely reliable, |