version 1.10, 2000/09/23 15:47:09
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version 1.25, 2011/08/19 17:57:56
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\ Structural Conditionals 12dec92py |
\ Structural Conditionals 12dec92py |
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\ Copyright (C) 1995,1996,1997,2000 Free Software Foundation, Inc. |
\ Copyright (C) 1995,1996,1997,2000,2003,2004,2007,2010 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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\ Gforth is free software; you can redistribute it and/or |
\ Gforth is free software; you can redistribute it and/or |
\ modify it under the terms of the GNU General Public License |
\ modify it under the terms of the GNU General Public License |
\ as published by the Free Software Foundation; either version 2 |
\ as published by the Free Software Foundation, either version 3 |
\ of the License, or (at your option) any later version. |
\ of the License, or (at your option) any later version. |
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\ This program is distributed in the hope that it will be useful, |
\ This program is distributed in the hope that it will be useful, |
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\ GNU General Public License for more details. |
\ GNU General Public License for more details. |
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\ You should have received a copy of the GNU General Public License |
\ You should have received a copy of the GNU General Public License |
\ along with this program; if not, write to the Free Software |
\ along with this program. If not, see http://www.gnu.org/licenses/. |
\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
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here 0 , \ just a dummy, the real value of locals-list is patched into it in glocals.fs |
here 0 , \ just a dummy, the real value of locals-list is patched into it in glocals.fs |
AConstant locals-list \ acts like a variable that contains |
AConstant locals-list \ acts like a variable that contains |
Line 92 variable backedge-locals
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Line 91 variable backedge-locals
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rdrop |
rdrop |
dup cs-item? ; |
dup cs-item? ; |
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: CS-DROP ( dest -- ) \ gforth |
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dest? 2drop ; |
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: cs-push-part ( -- list addr ) |
: cs-push-part ( -- list addr ) |
locals-list @ here ; |
locals-list @ here ; |
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Line 105 variable backedge-locals
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Line 107 variable backedge-locals
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\ Structural Conditionals 12dec92py |
\ Structural Conditionals 12dec92py |
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defer other-control-flow ( -- ) |
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\ hook for control-flow stuff that's not handled by begin-like etc. |
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: ?struc ( flag -- ) abort" unstructured " ; |
: ?struc ( flag -- ) abort" unstructured " ; |
: sys? ( sys -- ) dup 0= ?struc ; |
: sys? ( sys -- ) dup 0= ?struc ; |
: >mark ( -- orig ) |
: >mark ( -- orig ) |
cs-push-orig 0 , ; |
cs-push-orig 0 , other-control-flow ; |
: >resolve ( addr -- ) here over - swap ! ; |
: >resolve ( addr -- ) |
: <resolve ( addr -- ) here - , ; |
here swap ! |
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basic-block-end ; |
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: <resolve ( addr -- ) , ; |
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: BUT |
: BUT |
1 cs-roll ; immediate restrict |
1 cs-roll ; immediate restrict |
Line 146 immediate restrict
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Line 153 immediate restrict
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\ people who have not been brought up with Forth (or who have been |
\ people who have not been brought up with Forth (or who have been |
\ brought up with fig-Forth). |
\ brought up with fig-Forth). |
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: ELSE ( compilation orig1 -- orig2 ; run-time f -- ) \ core |
: ELSE ( compilation orig1 -- orig2 ; run-time -- ) \ core |
POSTPONE ahead |
POSTPONE ahead |
1 cs-roll |
1 cs-roll |
POSTPONE then ; immediate restrict |
POSTPONE then ; immediate restrict |
Line 155 Defer begin-like ( -- )
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Line 162 Defer begin-like ( -- )
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' noop IS begin-like |
' noop IS begin-like |
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: BEGIN ( compilation -- dest ; run-time -- ) \ core |
: BEGIN ( compilation -- dest ; run-time -- ) \ core |
begin-like cs-push-part dest ; immediate restrict |
begin-like cs-push-part dest |
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basic-block-end ; immediate restrict |
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Defer again-like ( dest -- addr ) |
Defer again-like ( dest -- addr ) |
' nip IS again-like |
' nip IS again-like |
Line 219 Avariable leave-sp leave-stack 3 cells
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Line 227 Avariable leave-sp leave-stack 3 cells
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leave-sp ! ; |
leave-sp ! ; |
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: DONE ( compilation orig -- ; run-time -- ) \ gforth |
: DONE ( compilation orig -- ; run-time -- ) \ gforth |
\ !! the original done had ( addr -- ) |
\g resolves all LEAVEs up to the compilaton orig (from a BEGIN) |
drop >r drop |
drop >r drop |
begin |
begin |
leave> |
leave> |
Line 299 Defer exit-like ( -- )
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Line 307 Defer exit-like ( -- )
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' noop IS exit-like |
' noop IS exit-like |
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: EXIT ( compilation -- ; run-time nest-sys -- ) \ core |
: EXIT ( compilation -- ; run-time nest-sys -- ) \ core |
\G Return to the calling definition; usually used as a way of |
\G Return to the calling definition; usually used as a way of |
\G forcing an early return from a definition. Before |
\G forcing an early return from a definition. Before |
\G @code{EXIT}ing you must clean up the return stack and |
\G @code{EXIT}ing you must clean up the return stack and |
\G @code{UNLOOP} any outstanding @code{?DO}...@code{LOOP}s. |
\G @code{UNLOOP} any outstanding @code{?DO}...@code{LOOP}s. |
exit-like |
exit-like |
POSTPONE ;s |
POSTPONE ;s |
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basic-block-end |
POSTPONE unreachable ; immediate restrict |
POSTPONE unreachable ; immediate restrict |
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: ?EXIT ( -- ) ( compilation -- ; run-time nest-sys f -- | nest-sys ) \ gforth |
: ?EXIT ( -- ) ( compilation -- ; run-time nest-sys f -- | nest-sys ) \ gforth |