version 1.24, 1999/04/16 22:19:50
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version 1.33, 2000/09/23 15:46:51
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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 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 45 Variable last-block
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Line 45 Variable last-block
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$20 Value buffers |
$20 Value buffers |
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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 87 Defer flush-blocks ( -- ) \ gforth
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Line 96 Defer flush-blocks ( -- ) \ gforth
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: block-position ( u -- ) \ block |
: block-position ( u -- ) \ block |
\G Position the block file to the start of block @i{u}. |
\G Position the block file to the start of block @i{u}. |
1- chars/block chars um* get-block-fid reposition-file throw ; |
offset @ - chars/block chars um* get-block-fid reposition-file throw ; |
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: update ( -- ) \ block |
: update ( -- ) \ block |
\G Mark the current block buffer as dirty. |
\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 -- ) \ gforth |
: save-buffer ( buffer -- ) \ gforth |
Line 108 Defer flush-blocks ( -- ) \ gforth
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Line 117 Defer flush-blocks ( -- ) \ gforth
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: save-buffers ( -- ) \ block |
: save-buffers ( -- ) \ block |
\G Transfer the contents of each @code{update}d block buffer to |
\G Transfer the contents of each @code{update}d block buffer to |
\G mass storage, then mark all block buffers as unassigned. |
\G mass storage, then mark all block buffers as assigned-clean. |
block-buffers @ |
block-buffers @ |
buffers 0 ?DO dup save-buffer next-buffer LOOP drop ; |
buffers 0 ?DO dup save-buffer next-buffer LOOP drop ; |
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Line 127 Defer flush-blocks ( -- ) \ gforth
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Line 136 Defer flush-blocks ( -- ) \ gforth
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' flush IS flush-blocks |
' flush IS flush-blocks |
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: get-buffer ( n -- a-addr ) \ gforth |
: 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- block |
: block ( u -- a-addr ) \ gforthman- block |
\G If a block buffer is assigned for block @i{u}, return its |
\G If a block buffer is assigned for block @i{u}, return its |
\G start address, @i{a-addr}. Otherwise, assign a block buffer |
\G start address, @i{a-addr}. Otherwise, assign a block buffer |
\G for block @i{u} (if the assigned block buffer has been |
\G for block @i{u} (if the assigned block buffer has been |
\G @code{update}d, transfer the contents to mass storage), read |
\G @code{update}d, transfer the contents to mass storage), read |
\G the block into the block buffer and return its start address, |
\G the block into the block buffer and return its start address, |
\G @i{a-addr}. |
\G @i{a-addr}. |
dup 0= -35 and throw |
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 167 Defer flush-blocks ( -- ) \ gforth
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Line 176 Defer flush-blocks ( -- ) \ gforth
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\ reading in the block is unnecessary, but simpler |
\ reading in the block is unnecessary, but simpler |
block ; |
block ; |
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User scr ( -- a-addr ) \ block-ext |
User scr ( -- a-addr ) \ block-ext s-c-r |
\G USER VARIABLE: @i{a-addr} is the address of a cell containing |
\G @code{User} variable -- @i{a-addr} is the address of a cell containing |
\G the block number of the block most recently processed by |
\G the block number of the block most recently processed by |
\G @code{list}. |
\G @code{list}. |
0 scr ! |
0 scr ! |
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\ nac31Mar1999 moved "scr @" to list to make the stack comment correct |
\ nac31Mar1999 moved "scr @" to list to make the stack comment correct |
: updated? ( n -- f ) \ gforth |
: updated? ( n -- f ) \ gforth |
\G Return true if block @i{n} has been marked as dirty. |
\G Return true if @code{updated} has been used to mark block @i{n} |
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\G as assigned-dirty. |
buffer |
buffer |
[ 0 buffer-dirty 0 block-buffer - ] Literal + @ ; |
[ 0 buffer-dirty 0 block-buffer - ] Literal + @ ; |
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Line 206 User scr ( -- a-addr ) \ block-ext
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Line 216 User scr ( -- a-addr ) \ block-ext
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\G Save the current input source specification. Store @i{n} in |
\G Save the current input source specification. Store @i{n} in |
\G @code{BLK}, set @code{>IN} to 0 and interpret. When the parse |
\G @code{BLK}, set @code{>IN} to 0 and interpret. When the parse |
\G area is exhausted, restore the input source specification. |
\G area is exhausted, restore the input source specification. |
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loadfilename# @ >r |
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2 loadfilename# ! \ "\a block/" |
push-file |
push-file |
dup loadline ! blk ! >in off ['] interpret catch |
dup loadline ! blk ! >in off ['] interpret catch |
pop-file throw ; |
pop-file |
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r> loadfilename# ! |
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throw ; |
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: thru ( i*x n1 n2 -- j*x ) \ block-ext |
: thru ( i*x n1 n2 -- j*x ) \ block-ext |
\G @code{load} the blocks @i{n1} through @i{n2} in sequence. |
\G @code{load} the blocks @i{n1} through @i{n2} in sequence. |
Line 224 User scr ( -- a-addr ) \ block-ext
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Line 238 User scr ( -- a-addr ) \ block-ext
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\G current block + @i{n1} thru the current block + @i{n2}. |
\G current block + @i{n1} thru the current block + @i{n2}. |
1+ swap ?DO I +load LOOP ; |
1+ swap ?DO I +load LOOP ; |
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: --> ( -- ) \ block- block chain |
: --> ( -- ) \ gforthman- gforth chain |
\G If this symbol is encountered whilst loading block @i{n}, |
\G If this symbol is encountered whilst loading block @i{n}, |
\G discard the remainder of the block and load block @i{n+1}. Used |
\G discard the remainder of the block and load block @i{n+1}. Used |
\G for chaining multiple blocks together as a single loadable unit. |
\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. |
refill drop ; immediate |
refill drop ; immediate |
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: block-included ( a-addr u -- ) \ gforth |
: block-included ( a-addr u -- ) \ gforth |