version 1.19, 1998/12/08 22:02:36
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version 1.41, 2003/03/09 15:16:46
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\ A less simple implementation of the blocks wordset. |
\ A less simple implementation of the blocks wordset. |
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\ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc. |
\ Copyright (C) 1995,1996,1997,1998,2000,2003 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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\ 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, write to the Free Software |
\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
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\ A more efficient implementation would use mmap on OSs that |
\ A more efficient implementation would use mmap on OSs that |
Line 44 Variable last-block
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Line 44 Variable last-block
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$20 Value buffers |
$20 Value buffers |
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\ limit block files to 2GB; gforth <0.6.0 erases larger block files on |
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\ 32-bit systems |
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$200000 Value block-limit |
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User block-fid |
User block-fid |
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User block-offset ( -- addr ) \ gforth |
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\G User variable containing the number of the first block (default |
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\G since 0.5.0: 0). Block files created with Gforth versions before |
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\G 0.5.0 have the offset 1. If you use these files you can: @code{1 |
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\G offset !}; or add 1 to every block number used; or prepend 1024 |
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\G characters to the file. |
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0 block-offset ! \ store 1 here fore 0.4.0 compatibility |
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' block-offset alias offset \ !! eliminate this? |
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: block-cold ( -- ) |
: block-cold ( -- ) |
block-fid off last-block off |
block-fid off last-block off |
Line 55 User block-fid
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Line 68 User block-fid
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block-cold |
block-cold |
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Defer flush-blocks |
Defer flush-blocks ( -- ) \ gforth |
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: open-blocks ( addr u -- ) \ gforth |
: open-blocks ( c-addr u -- ) \ gforth |
\g use the file, whose name is given by @var{addr u}, as blocks file |
\g Use the file, whose name is given by @i{c-addr u}, as the blocks file. |
2dup open-fpath-file 0<> |
try ( c-addr u ) |
if |
2dup open-fpath-file throw |
r/w bin create-file throw |
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else |
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rot close-file throw 2dup file-status throw bin open-file throw |
rot close-file throw 2dup file-status throw bin open-file throw |
>r 2drop r> |
>r 2drop r> |
then |
recover ( c-addr u ior ) |
block-fid @ IF flush-blocks block-fid @ close-file throw THEN |
>r 2dup file-status nip 0= r> and throw \ does it really not exist? |
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r/w bin create-file throw |
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endtry |
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block-fid @ IF |
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flush-blocks block-fid @ close-file throw |
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THEN |
block-fid ! ; |
block-fid ! ; |
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: use ( "file" -- ) \ gforth |
: use ( "file" -- ) \ gforth |
\g use @var{file} as blocks file |
\g Use @i{file} as the blocks file. |
name open-blocks ; |
name open-blocks ; |
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\ the file is opened as binary file, since it either will contain text |
\ the file is opened as binary file, since it either will contain text |
\ without newlines or binary data |
\ without newlines or binary data |
: get-block-fid ( -- fid ) |
: get-block-fid ( -- wfileid ) \ gforth |
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\G Return the file-id of the current blocks file. If no blocks |
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\G file has been opened, use @file{blocks.fb} as the default |
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\G blocks file. |
block-fid @ 0= |
block-fid @ 0= |
if |
if |
s" blocks.fb" open-blocks |
s" blocks.fb" open-blocks |
then |
then |
block-fid @ ; |
block-fid @ ; |
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: block-position ( u -- ) |
: block-position ( u -- ) \ block |
\ positions the block file to the start of block u |
\G Position the block file to the start of block @i{u}. |
1- chars/block chars um* get-block-fid reposition-file throw ; |
dup block-limit u>= -35 and throw |
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offset @ - chars/block chars um* get-block-fid reposition-file throw ; |
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: update ( -- ) |
: update ( -- ) \ block |
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\G Mark the state of the current block buffer as assigned-dirty. |
last-block @ ?dup IF buffer-dirty on THEN ; |
last-block @ ?dup IF buffer-dirty on THEN ; |
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: save-buffer ( buffer -- ) >r |
: save-buffer ( buffer -- ) \ gforth |
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>r |
r@ buffer-dirty @ r@ buffer-block @ 0<> and |
r@ buffer-dirty @ r@ buffer-block @ 0<> and |
if |
if |
r@ buffer-block @ block-position |
r@ buffer-block @ block-position |
r@ block-buffer chars/block r@ buffer-fid @ write-file throw |
r@ block-buffer chars/block r@ buffer-fid @ write-file throw |
r@ buffer-dirty off |
r@ buffer-fid @ flush-file throw |
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r@ buffer-dirty off |
endif |
endif |
rdrop ; |
rdrop ; |
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: empty-buffer ( buffer -- ) |
: empty-buffer ( buffer -- ) \ gforth |
buffer-block off ; |
buffer-block off ; |
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: save-buffers ( -- ) block-buffers @ |
: save-buffers ( -- ) \ block |
buffers 0 ?DO dup save-buffer next-buffer LOOP drop ; |
\G Transfer the contents of each @code{update}d block buffer to |
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\G mass storage, then mark all block buffers as assigned-clean. |
: empty-buffers ( -- ) block-buffers @ |
block-buffers @ |
buffers 0 ?DO dup empty-buffer next-buffer LOOP drop ; |
buffers 0 ?DO dup save-buffer next-buffer LOOP drop ; |
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: flush ( -- ) |
: empty-buffers ( -- ) \ block-ext |
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\G Mark all block buffers as unassigned; if any had been marked as |
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\G assigned-dirty (by @code{update}), the changes to those blocks |
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\G will be lost. |
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block-buffers @ |
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buffers 0 ?DO dup empty-buffer next-buffer LOOP drop ; |
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: flush ( -- ) \ block |
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\G Perform the functions of @code{save-buffers} then |
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\G @code{empty-buffers}. |
save-buffers |
save-buffers |
empty-buffers ; |
empty-buffers ; |
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' flush IS flush-blocks |
' flush IS flush-blocks |
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: get-buffer ( n -- a-addr ) |
: get-buffer ( u -- a-addr ) \ gforth |
buffers mod buffer-struct %size * block-buffers @ + ; |
0 buffers um/mod drop buffer-struct %size * block-buffers @ + ; |
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: block ( u -- a-addr ) |
: block ( u -- a-addr ) \ gforthman- block |
dup 0= -35 and throw |
\G If a block buffer is assigned for block @i{u}, return its |
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\G start address, @i{a-addr}. Otherwise, assign a block buffer |
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\G for block @i{u} (if the assigned block buffer has been |
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\G @code{update}d, transfer the contents to mass storage), read |
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\G the block into the block buffer and return its start address, |
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\G @i{a-addr}. |
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dup offset @ u< -35 and throw |
dup get-buffer >r |
dup get-buffer >r |
dup r@ buffer-block @ <> |
dup r@ buffer-block @ <> |
r@ buffer-fid @ block-fid @ <> or |
r@ buffer-fid @ block-fid @ <> or |
Line 134 Defer flush-blocks
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Line 172 Defer flush-blocks
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then |
then |
r> dup last-block ! block-buffer ; |
r> dup last-block ! block-buffer ; |
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: buffer ( u -- a-addr ) |
: buffer ( u -- a-addr ) \ block |
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\G If a block buffer is assigned for block @i{u}, return its |
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\G start address, @i{a-addr}. Otherwise, assign a block buffer |
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\G for block @i{u} (if the assigned block buffer has been |
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\G @code{update}d, transfer the contents to mass storage) and |
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\G return its start address, @i{a-addr}. The subtle difference |
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\G between @code{buffer} and @code{block} mean that you should |
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\G only use @code{buffer} if you don't care about the previous |
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\G contents of block @i{u}. In Gforth, this simply calls |
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\G @code{block}. |
\ reading in the block is unnecessary, but simpler |
\ reading in the block is unnecessary, but simpler |
block ; |
block ; |
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User scr 0 scr ! |
User scr ( -- a-addr ) \ block-ext s-c-r |
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\G @code{User} variable -- @i{a-addr} is the address of a cell containing |
: updated? ( n -- f ) scr @ buffer |
\G the block number of the block most recently processed by |
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\G @code{list}. |
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0 scr ! |
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\ nac31Mar1999 moved "scr @" to list to make the stack comment correct |
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: updated? ( n -- f ) \ gforth |
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\G Return true if @code{updated} has been used to mark block @i{n} |
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\G as assigned-dirty. |
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buffer |
[ 0 buffer-dirty 0 block-buffer - ] Literal + @ ; |
[ 0 buffer-dirty 0 block-buffer - ] Literal + @ ; |
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: list ( u -- ) |
: list ( u -- ) \ block-ext |
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\G Display block @i{u}. In Gforth, the block is displayed as 16 |
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\G numbered lines, each of 64 characters. |
\ calling block again and again looks inefficient but is necessary |
\ calling block again and again looks inefficient but is necessary |
\ in a multitasking environment |
\ in a multitasking environment |
dup scr ! |
dup scr ! |
." Screen " u. |
." Screen " u. |
updated? 0= IF ." not " THEN ." modified " cr |
scr @ updated? 0= IF ." not " THEN ." modified " cr |
16 0 |
16 0 |
?do |
?do |
i 2 .r space scr @ block i 64 * chars + 64 type cr |
i 2 .r space scr @ block i 64 * chars + 64 type cr |
loop ; |
loop ; |
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: (source) ( -- addr len ) |
[IFDEF] current-input |
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:noname 2 <> -12 and throw >in ! blk ! ; |
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\ restore-input |
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:noname blk @ >in @ 2 ; \ save-input |
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:noname 2 ; \ source-id "*a block*" |
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:noname 1 blk +! 1 loadline +! true ; \ refill |
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:noname blk @ block chars/block ; \ source |
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Create block-input A, A, A, A, A, |
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: load ( i*x n -- j*x ) \ block |
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\G Save the current input source specification. Store @i{n} in |
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\G @code{BLK}, set @code{>IN} to 0 and interpret. When the parse |
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\G area is exhausted, restore the input source specification. |
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block-input 0 new-tib dup loadline ! blk ! s" * a block*" loadfilename 2! |
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['] interpret catch pop-file throw ; |
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[ELSE] |
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: (source) ( -- c-addr u ) |
blk @ ?dup |
blk @ ?dup |
IF block chars/block |
IF block chars/block |
ELSE tib #tib @ |
ELSE tib #tib @ |
THEN ; |
THEN ; |
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' (source) IS source |
' (source) IS source ( -- c-addr u ) \ core |
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\G @i{c-addr} is the address of the input buffer and @i{u} is the |
: load ( i*x n -- j*x ) |
\G number of characters in it. |
push-file |
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dup loadline ! blk ! >in off ['] interpret catch |
: load ( i*x n -- j*x ) \ block |
pop-file throw ; |
\G Save the current input source specification. Store @i{n} in |
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\G @code{BLK}, set @code{>IN} to 0 and interpret. When the parse |
: thru ( i*x n1 n2 -- j*x ) |
\G area is exhausted, restore the input source specification. |
1+ swap ?DO I load LOOP ; |
s" * a block*" loadfilename>r |
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push-file |
: +load ( i*x n -- j*x ) blk @ + load ; |
dup loadline ! blk ! >in off ['] interpret catch |
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pop-file |
: +thru ( i*x n1 n2 -- j*x ) |
r>loadfilename |
1+ swap ?DO I +load LOOP ; |
throw ; |
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[THEN] |
: --> ( -- ) refill drop ; immediate |
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: thru ( i*x n1 n2 -- j*x ) \ block-ext |
: block-included ( addr u -- ) |
\G @code{load} the blocks @i{n1} through @i{n2} in sequence. |
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1+ swap ?DO I load LOOP ; |
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: +load ( i*x n -- j*x ) \ gforth |
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\G Used within a block to load the block specified as the |
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\G current block + @i{n}. |
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blk @ + load ; |
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: +thru ( i*x n1 n2 -- j*x ) \ gforth |
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\G Used within a block to load the range of blocks specified as the |
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\G current block + @i{n1} thru the current block + @i{n2}. |
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1+ swap ?DO I +load LOOP ; |
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: --> ( -- ) \ gforthman- gforth chain |
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\G If this symbol is encountered whilst loading block @i{n}, |
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\G discard the remainder of the block and load block @i{n+1}. Used |
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\G for chaining multiple blocks together as a single loadable |
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\G unit. Not recommended, because it destroys the independence of |
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\G loading. Use @code{thru} (which is standard) or @code{+thru} |
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\G instead. |
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refill drop ; immediate |
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: block-included ( a-addr u -- ) \ gforth |
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\G Use within a block that is to be processed by @code{load}. Save |
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\G the current blocks file specification, open the blocks file |
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\G specified by @i{a-addr u} and @code{load} block 1 from that |
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\G file (which may in turn chain or load other blocks). Finally, |
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\G close the blocks file and restore the original blocks file. |
block-fid @ >r block-fid off open-blocks |
block-fid @ >r block-fid off open-blocks |
1 load block-fid @ close-file throw flush |
1 load block-fid @ close-file throw flush |
r> block-fid ! ; |
r> block-fid ! ; |
Line 192 true constant block
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Line 293 true constant block
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true constant block-ext |
true constant block-ext |
set-current |
set-current |
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: bye ['] flush catch drop bye ; |
: bye ( -- ) \ tools-ext |
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\G Return control to the host operating system (if any). |
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['] flush catch drop bye ; |