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The OpenBIOS forth engine was written by
Patrick Mauritz <oxygene@openbios.info>
Stefan Reinauer <stepan@openbios.info>
# tag: list of authors

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# tag: stepan's changelog for CVS
Mon Jul 14 02:16:49 CEST 2003
- fix segv overrun while dumping dictionary in unix.c
- implement first version of >number and $number
- add stack diagram to digit
- no newline after accept
- new version of the interpreter
- fix make run target
Mon Jul 14 20:15:40 CEST 2003
- negate true value in prims
- get rid of primitive word bounds.
- get rid of some obsolete code.
- implement io[cwl][@!]
- reorganize [in|out][bwl]
- start adding stack diagrams to primitives.
Mon Jul 14 23:57:46 CEST 2003
- added some more stack diagrams in forth.h
- move parse, parse-word, word to bootstrap.fs
- include memory.fs from bootstrap.fs for above.
Wed Jul 16 22:57:31 CEST 2003
- add include guards
- add banner
- fix primitives' dependencies
Sun Jul 20 03:27:40 CEST 2003
- remove unneeded readcell
- rename ' to ['] to meet specs
Sun Jul 20 14:08:43 CEST 2003
- add rest of stack diagrams in forth.h
- move here and here! to forth.h (from internal.h)
- indent includes
- merge system.h into forth.h
- Change tag of forth.h (!) because the old one
did not meet the meaning of the code.
- update comments in primitives.c
Sun Jul 27 01:53:18 CEST 2003
- include great new do/?do/loop/+loop
implementation from Patrick.
- include testsuite enhancement from Patrick
- include trampoline from Patrick (fixes execute)
Sun Jul 27 21:11:50 CEST 2003
- update x86 console code to become when using
multiboot (vga/keyboard).
- fix exit properly
- revert to old case..endcase code
- fix >number and $number
- add number parsing to interpreter
- add simple stack checking to interpreter
- add 2 testcases (exit and case2)
Mon Jul 28 14:49:31 CEST 2003
- move 7.3.7 Flag constants up in bootstrap.fs
- move 7.3.9.2.4 Miscellaneous dictionary down.
- add reveal, recursive, recurse, environment? to 7.3.9.2.4
- move (to) to bootstrap.fs
Mon Jul 28 17:08:58 CEST 2003
- add stack overflow check to interpreter
- check parse-word result in interpreter.
- add ascii and char, add helper handle-lit
Tue Jul 29 09:20:18 CEST 2003
- add s" and ."
- add [char] and control
- heavily move around words in bootstrap.fs
to get dependencies resolved.
- fix skipws crash
- rename query to refill
- interpreter reads several words in a line now
- interpreter stops now if error encountered in
currently parsed line.
- add forth definitions of ( and \
- change c parser/interpreter to handle comments
correctly.
- indent, clean up unix.c
Tue Jul 29 18:13:27 CEST 2003
- add .( (chapter 7.3.4.4)
- add pack, -trailing (chapter 7.3.4.8)
- add d#, h#, o# (chapter 7.3.5.2)
- let first stack element start at 1 instead of 0
to have a 1 cell guard band.
- set SA_NODEFER flag to signal handler to ensure
that it is entered recursively.
Tue Jul 29 19:06:18 CEST 2003
- more simplification for unix.c
- add ', ['], find
- fix pack, count
- add literal, compile, [compile], compile,
- fix [
Wed Jul 30 01:24:24 CEST 2003
- add >body, body>
- add helpers: flags?, immediate?, compile-only?, header
- add :, ;, constant, value, variable, buffer:
- parse word's flags in interpreter to make colon
definitions work
- add "compiled" acknowledge when interpreter is in compile mode
Wed Jul 30 07:27:58 CEST 2003
- fix flags handling in interpreter
- fix handle-text compile mode behaviour
- add defer, struct, field
- add behaviour, to
- add $create, create, does> (missing c code DODOES)
- add abort
Thu Jul 31 07:58:35 CEST 2003
- fix DODOES cfa code
- make 2@ and 2! colon definitions instead of primitives.
- add word "cell"
- add warning message as described in 7.3.9.1 if an already
existing word is created
Fri Aug 1 23:32:57 CEST 2003
- fix s" in C interpreter (compare case insensitive)
- fix forth source dependencies
- fix forth word sm/rem
Sat Aug 2 13:34:43 CEST 2003
- add band guard around input buffer
- make sure that "header" pads null bytes
- define -1,0,1,2,3 early to safe dictionary space
Sat Aug 2 16:58:31 CEST 2003
- use getopt/getopt_long for option parsing
- add include path option -I to unix
- don't create obsolete symlink in forth/Makefile
- fix recurse
- fix prim word /
- implement postpone
- fix 2!, ['] and '
- implement evaluate/eval
Sun Aug 3 11:48:18 CEST 2003
- implement "bye" to leave the engine
- change initial word to "initialize" and
make quit restart the forth engine.
- fix missing ; in u.
- fix return value of find when handling an immediate
- getting rid of primitives mod, /mod and /, replacing
them by floored variants as IEEE 1275-1994 says.
- clean up primitives.
Sun Aug 3 23:06:39 CEST 2003
- fix >body, body>
- make not a synonym for invert as described in IEEE 1275
- todigit can now switch between capital and small letters via
value capital-hex?
Mon Aug 4 21:57:06 CEST 2003
- indent unix.c
- reimplement do, ?do, loop, +loop with prim helpers. It now
passes hayes' ans forth test suite.
- adopt unix.c and bootstrap.fs to new (?)do..(+)loop
- remove unneeded if around ?do..loop in ",
- interpreter: clear input buffer before refilling it
- serialize PC changes in dobranch and do?branch
Thu Aug 7 19:00:43 CEST 2003
- add/change missing/incomplete copyright notices
- implement "
Sun Aug 10 19:52:20 CEST 2003
- reimplement catch, through
- implement abort"
- rephrase endcase
- change interpreter to use exception words
- implement forget
- add dummy "forth"
Sun Aug 10 22:12:28 CEST 2003
- fix "spaces"
- create subdir util for types.sh and new bin2hex
- enable forth.html again, running hayes test suite.
- include dictionary in char array instead of elf section
when building an x86 "full" image
- don't newline in accept.
- fix " compile mode behavior.
- move throw/catch and use it with ' and [']
- add :noname
Thu Aug 14 23:02:15 CEST 2003
- fix "field"
- implement second stage bootstrapping
NOTE: changes dictionary format!
- drop initxt from dictionary, since we know "last" now.
- output dictionary can be named on command line.
- make segfault handler optional
Mon Sep 1 19:41:23 CEST 2003
- move findword() et al to dict.c (needed by openbios.c due
to last dictionary change)
- fix findword() return values and optimize it slightly.
- indented some files.
Mon Sep 8 22:43:55 CEST 2003
- add initial AMD64 support (cloned x86 target)
- get vocabulary implementation working. maybe buggy, but operable
- enable vocabulary support by default (vocabularies? set to true)
- drop duplicate "forth"
- fix some comments in forth files.
Sun Sep 28 14:26:41 CEST 2003
- some documentation and comment fixes
- fix parameter passing for io words.
Thu Oct 2 08:21:06 CEST 2003
- clean up lit
- inline some functions from internal.h (reduces size and execution
time)
Fri Oct 3 15:20:44 CEST 2003
- make i and j primitives. This safes a lot of time in loops.
i.e. the following dummy loop executes 300% faster:
: fbar 1000 0 do 1000 0 do j drop i drop loop loop ;
Sat Oct 11 20:18:22 CEST 2003
- include plugin interface for unix hosted version.
- add plugin_pci and plugin_qt as examples.
- add simple set of pci functions for testing the pci plugin
- add state variable "runforth" to be changed by the qt plugin
on exit.
Sun Oct 12 14:57:54 CEST 2003
- move internal.h and forth.h to kernel/
- replace make by $(MAKE) in some places.
Tue Oct 14 01:06:39 CEST 2003
- add (immediate) and (compile-only)
Wed Oct 15 00:52:49 CEST 2003
- check whether dlopen() needs libdl.
- include BSD compile fixes from oxygene
- fix abort"
Tue Oct 21 22:08:00 CEST 2003
- fix forth.html dependencies
- yet another indent orgy
Thu Oct 30 16:10:01 CET 2003
- add "call" to execute native code functions
- plugin_qt: fix framebuffer address on 64bit systems
- plugin_pci: create position independent code.
Wed Nov 5 08:38:18 CET 2003
- fix "comp" (from Samuel Rydh)
- include instance support (from Samuel Rydh)
Sun Nov 9 15:53:33 CET 2003
- some changes for "see"
- apply more patches from Samuel.
- smaller, better implementation of handle-text
Mon Nov 10 22:06:32 CET 2003
- increase max dictionary size from 64k to 128k
- add simple fcode to qt plugin
- fix handle-text (move null-align up)
Tue Nov 11 22:53:27 CET 2003
- rename ?key to key?.
- clean up .s
- add (cr
Tue Nov 17 22:42:54 CET 2003
- enterforth rstack fix (from Samuel)
- include latest version of qt interface
fcode driver
- fix "header" (from Samuel)
Wed Nov 26 15:12:07 CET 2003
- merge patches from Samuel:
- add $buffer:
- fill all of "ib", not only 80 characters
- interpreted conditionals support
- late initializers
Sun Nov 30 23:04:28 CET 2003
- fix bug in enterforth (non-colon words would destroy PC)
Sat Dec 13 00:57:01 CET 2003
- add initial ppc infrastructure
- only search current wordlist in "header"
- seperate unix host binary and bootstrap interpreter.
Sun Dec 14 18:13:29 CET 2003
- add sys-debug word and use it to stop forth interpreter
during bootstrap if an error occurs.
Sat Mar 13 16:30:30 CET 2004
- fix digit problem

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TODO
booting
* support more arches than x86+amd64
* compressed + rommable dictionary
forth bootstrap
* make prompt configurable
* check state-variable when defining a new word.
tag: TODO for the forth system

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# tag: contains a description of the dictionary format
name | length of name in bytes + 0x80 | align with 0's | flags (bit 7 set) | LFA | CFA | PFA
LFA == link field address (backlink)
CFA == code field address ("word type")
PFA == program field address (definitions)

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# tag: glossary of openbios forth
# dictionary
LFA == link field address (backlink)
CFA == code field address ("word type")
PFA == program field address (definitions)
# forth engine
TIB == text input buffer
inner interpreter: interprets dictionary, does threading
outer interpreter: "user" interpreter, reads forth words from user.

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Initializers are called when the forth kernel is started, to do some
initialization stuff.
Pro: If code needs initialization you can keep this in place with the code
and don't need to patch the kernel itself to do so.
There are 2 types of initializers. "Normal" and "Late" initializers.
Since initializers are only called during startup, they don't need a name.
Definition:
initializer ( xt -- )
late-initializer ( xt -- )
Examples:
:noname <definition> ; initializer
:noname
some-base initializations
; late-initializer
Late initializers are run after all ordinary initializers have
been executed.