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Ad DEFER and friends. Aling more with forth-standard.org naming
This commit is contained in:
David Schmenk
parent
cdfb59846f
commit
a840f2b2ac
@ -13,17 +13,13 @@ There are quite a few missing word that a standard FORTH would have. Mostly due
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## PLFORTH built-in words
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## PLFORTH specific words
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### Words for looking at internal structures:
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`SHOW xxxx`: Displays the decompiled words making up the definition of `xxxx`
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`SHOWSTACK`: Displays the data stack
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`SHOWRSTACK`: Displays the return stack. Note: PLFORTH uses a software defined return stack, this is not the hardware stack
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`.RS`: Displays the return stack. Note: PLFORTH uses a software defined return stack, this is not the hardware stack
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### Words for tracing and single stepping execution:
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@ -75,17 +71,27 @@ While running code, `<CTRL-C>` will break out and return to the interpreter.
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`NUM?`: Convert string and length to number, returning number and valid flag
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Numbers entered with a preceeding `$` will be interpreted as hex values
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### Words for displaying hex numbers
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`$.`: Display TOS word in hex with leading `$`
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`C$.`: Display TOS byte in hex with leading `$`
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## Debugging vs Performance
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PLFORTH defaults to compiling using ITC (Indirect Threaded Code). This supports a list of inspection and debugging features while developing programs and scripts. However, the compiler can easily switch to PBC (PLASMA Byte Code) to greatly improve performance, but most of the debugging tools are lost. ITC compiled words and PBC compiled words can be intermingled and call each other seemlessly. PLASMA Byte Code is a direct match to many low-level FORTH constructs.
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## Hi-Res Graphics
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Due to the way the Apple II implements Hi-Res graphics, a stub loader is required to reserve the pages used.
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## Graphics
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Due to the way the Apple II implements Hi-Res, Lo-Res and Double Lo-Res graphics, a stub loader is required to reserve the pages used.
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`HRFORTH`: Reserve HGR page 1 before launching PLFORTH
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`HR2FORTH`: Reserve HGR pages 1 and 2 before launching PLFORTH
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`TX2FORTH`: Reserve GR and DGR pages 1 and 2 before launching PLFORTH
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## Scripts
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There are a few useful scripts located in the `scripts` directory. By far the most useful is `plasma.4th`
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Binary file not shown.
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Before Width: | Height: | Size: 18 KiB After Width: | Height: | Size: 19 KiB |
Binary file not shown.
Binary file not shown.
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@ -7,9 +7,10 @@ include "inc/longjmp.plh"
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// Internal variables
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//
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const JSR = $20 // 6502 JSR opcode needed for VM entry
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const RTS = $60
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const SRCREFS = 2
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const INBUF_SIZE = 128
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word vlist, infunc, inptr, IIP, W
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word latest, infunc, inptr, IIP, W
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word vmvect, startheap, arg
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byte srclevel = 0
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//
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@ -107,20 +108,20 @@ predef _branch_#0, _0branch_(a)#0, _if_#0, _else_#0, _then_#0
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predef _begin_#0, _again_#0, _until_#0, _while_#0, _repeat_#0
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predef _case_#0, _of_#0, _endof_#0, _endcase_#0
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predef _dodo_(a,b)#0, _do_#0, _doloop_#0, _doplusloop_(a)#0, _plusloop_#0, _loop_#0
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predef _unloop_#0, _leave_#0, _j_#1
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predef _unloop_#0, _leave_#0, _j_#1, _defer_#0, _is_(a)#0, _noname_#0
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predef _create_#0, _itcdoes_(a)#0, _does_#0, _compoff_#0, _compon_#0, _state_#1
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predef _compile_#0, _forcecomp_#0, _dictaddw_(a)#0, _dictaddb_(a)#0, _colon_#0, _semi_#0
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predef _componly_#0, _interponly_#0, _immediate_#0, _exit_#0, _pad_#1, _trailing_(a,b)#2
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predef _tors_(a)#0, _fromrs_#1, _toprs_#1, _lookup_#1, _latest_#1
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predef _tors_(a)#0, _fromrs_#1, _toprs_#1, _lookup_#1, _latest_#1, _recurse_#0
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predef _cmove_(a,b,c)#0, _move_(a,b,c)#0, _fill_(a,b,c)#0, _plasma_(a)#0
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predef _var_(a)#0, _const_(a)#0, _lit_#1, _slit_#1, _find_(a)#2
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predef _tick_#0, _forget_#0, _keypressed_#1, _key_#1, _prat_(a)#0
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predef _blank_#0, _char_#0, _str_#0, _prstr_#0, _prpstr_#0
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predef _prval_(a)#0, _prbyte_(a)#0, _prhex_(a)#0, _accept_(a,b)#1, _type_(a,b)#0
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predef _vlist_#0, _tron_#0, _troff_#0, _stepon_#0, _stepoff_#0
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predef _words_#0, _tron_#0, _troff_#0, _stepon_#0, _stepoff_#0
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predef _itc_#0, _pbc_#0, _comment_#0, _src_(a)#0, _srcstr_#0, _endsrc_#0, _ifendsrc_(a)#0
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predef _brk_#0, _brkon_#0, _brkoff_#0, _word_(a)#1, _count_(a)#2
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predef _space_#0, _spaces_(a)#0, _show_#0, _showstack_#0, _showrstack_#0
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predef _space_#0, _spaces_(a)#0, _see_#0, _prstack_#0, _prrstack_#0
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predef _cont_#0, _restart_#0, _bye_#0, _quit_#0
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predef _abort_(a)#0, _doabortstr_(a,b)#0, _abortstr_#0
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predef _compword_(dentry)#0, _compliteral_(a)#0, _execword_(dentry)#0, _isnum_(a,b)#2
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@ -247,14 +248,22 @@ word = @d_ugt, 0, @isult
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char d_0lt = "0<"
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byte = inlinew_flag
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word = @d_ult, 0, 0, $4600 // ZERO ISLT
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// GREATER THAN ZERO
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char d_0gt = "0>"
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byte = inlinew_flag
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word = @d_0lt, 0, 0, $4400 // ZERO ISGT
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// EQUALS ZERO
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char d_0eq = "0="
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byte = inlinew_flag
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word = @d_0lt, 0, 0, $4000 // ZERO ISEQ
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word = @d_0gt, 0, 0, $4000 // ZERO ISEQ
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// NOT EQUAL ZERO
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char d_0ne = "0<>"
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byte = inlinew_flag
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word = @d_0eq, 0, 0, $4200 // ZERO ISNE
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// ABS
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char d_abs = "ABS"
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byte = 0
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word = @d_0eq, 0, @_abs_
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word = @d_0ne, 0, @_abs_
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// MIN
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char d_min = "MIN"
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byte = 0
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@ -351,10 +360,14 @@ word = 0, 0, @_branch_, $C4
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char d_0branch = "(0BRANCH)"
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byte = param_flag | inline_flag | showcr_flag
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word = 0, 0, @_0branch_, $C2
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// RECURSE
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char d_recurse = "RECURSE"
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byte = imm_flag | componly_flag
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word = @d_allot, 0, @_recurse_
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// IF
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char d_if = "IF"
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byte = imm_flag | componly_flag
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word = @d_allot, 0, @_if_
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word = @d_recurse, 0, @_if_
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// ELSE
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char d_else = "ELSE"
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byte = imm_flag | componly_flag
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@ -471,10 +484,22 @@ word = @d_commab, 0, @_state_
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char d_colon = ":"
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byte = interponly_flag
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word = @d_state, 0, @_colon_
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// NONAME
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char d_noname = ":NONAME"
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byte = interponly_flag
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word = @d_colon, 0, @_noname_
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// DEFER
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char d_defer = "DEFER"
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byte = interponly_flag
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word = @d_noname, 0, @_defer_
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// IS
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char d_is = "IS"
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byte = interponly_flag
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word = @d_defer, 0, @_is_
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// COMP OFF
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char d_compoff = "["
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byte = imm_flag | componly_flag
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word = @d_colon, 0, @_compoff_
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word = @d_is, 0, @_compoff_
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// COMP ON
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char d_compon = "]"
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byte = interponly_flag
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@ -670,22 +695,22 @@ word = @d_exitforth, 0, @_comment_
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char d_bye = "BYE"
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byte = 0
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word = @d_comment, 0, @_bye_
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// SHOW DEFINITION
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char d_show = "SHOW"
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// SEE DEFINITION
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char d_see = "SEE"
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byte = interponly_flag
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word = @d_bye, 0, @_show_
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// SHOW STACK
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char d_showstack = "SHOWSTACK"
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word = @d_bye, 0, @_see_
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// PRINT STACK
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char d_prstack = ".S"
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byte = showcr_flag
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word = @d_show, 0, @_showstack_
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// SHOW RSTACK
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char d_showrstack = "SHOWRSTACK"
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word = @d_see, 0, @_prstack_
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// PRINT RSTACK
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char d_prrstack = ".RS"
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byte = showcr_flag
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word = @d_showstack, 0, @_showrstack_
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word = @d_prstack, 0, @_prrstack_
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// TRACE ON
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char d_tron = "TRON"
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byte = showcr_flag
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word = @d_showrstack, 0, @_tron_
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word = @d_prrstack, 0, @_tron_
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// TRACE OFF
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char d_troff = "TROFF"
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byte = showcr_flag
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@ -721,10 +746,10 @@ word = @d_itc, 0, @_pbc_
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//
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// Start of vocabulary
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//
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// LIST VOCAB
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char d_vlist = "VLIST"
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// LIST VOCAB WORDS
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char d_words = "WORDS"
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byte = showcr_flag
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word = @d_pbc, 0, @_vlist_
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word = @d_pbc, 0, @_words_
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//
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// Helper routines
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//
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@ -825,7 +850,7 @@ def buildhashtbl#0
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for i = 0 to HASH_MASK
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hashtbl[i] = 0
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next
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dentry = vlist
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dentry = latest
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while dentry
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hash = hashname(dentry + 1, ^dentry)
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*_hfa_(dentry) = hashtbl[hash])
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@ -842,8 +867,8 @@ def warmstart#0
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brkcfa = 0
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RSP = RSTK_SIZE
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if state & comp_flag // Undo compilation state
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heaprelease(vlist)
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vlist = *_lfa_(vlist)
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heaprelease(latest)
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latest = *_lfa_(latest)
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fin
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state = 0
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while !endsrc; loop
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@ -856,7 +881,7 @@ end
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//
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def coldstart#0
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warmstart
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vlist = @d_vlist
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latest = @d_words
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heaprelease(startheap)
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buildhashtbl
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end
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@ -937,7 +962,7 @@ end
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// Break handler
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//
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def showtrace(dentry)#0
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putln; puts("( "); _showstack_; puts(") "); puts(dentry); putc(' ')
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putln; puts("( "); _prstack_; puts(") "); puts(dentry); putc(' ')
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end
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def brkhandle(dentry)#0
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word brk_infn, brk_inptr, brk_iip
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@ -1066,8 +1091,8 @@ def _interpret_#0
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inchars, inlen = nextword(' ')
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dentry = find(inchars, inlen)
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if dentry
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if not state & comp_flag or ^_ffa_(dentry) & imm_flag
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if not state & comp_flag and ^_ffa_(dentry) & componly_flag
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if not (state & comp_flag) or (^_ffa_(dentry) & imm_flag)
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if not (state & comp_flag) and (^_ffa_(dentry) & componly_flag)
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puts(dentry)
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puts(" : Compile only word\n")
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_quit_
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@ -1193,16 +1218,16 @@ def _trailing_(a,b)#2
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return a, b
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end
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def _latest_#1
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return vlist
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return latest
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end
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def newdict#0
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word bldptr, plist, namechars, namelen
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namechars, namelen = nextword(' ')
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plist = vlist
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vlist = heapmark
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^vlist = namelen
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bldptr = vlist + 1
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plist = latest
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latest = heapmark
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^latest = namelen
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bldptr = latest + 1
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while namelen
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^bldptr = ^namechars
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bldptr++
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@ -1211,18 +1236,18 @@ def newdict#0
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loop
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^bldptr = 0 // Flags
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bldptr++
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*bldptr = plist; // Link ptr
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*bldptr = plist; // Link ptr
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bldptr = bldptr + 2
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*bldptr = 0; // Hash ptr
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*bldptr = 0; // Hash ptr
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bldptr = bldptr + 2
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*bldptr = bldptr + 2 // Point CFA to PFA
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heapalloc(bldptr - vlist + 2)
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*bldptr = bldptr + 2 // Point CFA to PFA
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heapalloc(bldptr - latest + 2)
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end
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def _plasma_(a)#0
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newdict
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^(_ffa_(vlist)) = showcr_flag
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*(_cfa_(vlist)) = a // PLASMA code address
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addhash(vlist)
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^(_ffa_(latest)) = showcr_flag
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*(_cfa_(latest)) = a // PLASMA code address
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addhash(latest)
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end
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def _var_(a)#0
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newdict
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@ -1231,7 +1256,7 @@ def _var_(a)#0
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_dictaddw_(heapmark + 3) // Poiner to variable in PFA
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_dictaddb_($5C) // RET
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_dictaddw_(a) // Variable storage
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addhash(vlist)
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addhash(latest)
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end
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def _const_(a)#0
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newdict
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@ -1239,7 +1264,7 @@ def _const_(a)#0
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_dictaddb_($2C) // CONSTANT WORD
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_dictaddw_(a)
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_dictaddb_($5C) // RET
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addhash(vlist)
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addhash(latest)
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end
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def _create_#0
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newdict
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@ -1248,7 +1273,7 @@ def _create_#0
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_dictaddw_(heapmark + 5) // Pointer to rest of PFA
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_dictaddb_($5C) // RET
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_dictaddw_(0) // reserved word for DOES>
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addhash(vlist)
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addhash(latest)
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//
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// 9 bytes after PFA, data follows...
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//
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@ -1264,16 +1289,16 @@ def _itcdoes_(a)#0
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//
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// Overwrite CREATE as ITC words
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//
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^(_ffa_(vlist)) = ^(_ffa_(vlist)) | itc_flag
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*(_cfa_(vlist)) = @_dodoes_
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*(_pfa_(vlist)) = a // Fill in DOES code address
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^(_ffa_(latest)) = ^(_ffa_(latest)) | itc_flag
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*(_cfa_(latest)) = @_dodoes_
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*(_pfa_(latest)) = a // Fill in DOES code address
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end
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def _pbcdoes_(a)#0
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//
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// Rewrite the end of CREATE
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//
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^(_pfa_(vlist) + 6) = $C4 // JUMP DOES> directly
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*(_pfa_(vlist) + 7) = a
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^(_pfa_(latest) + 6) = $C4 // JUMP DOES> directly
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*(_pfa_(latest) + 7) = a
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end
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def _does_#0
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if state & comp_itc_flag
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@ -1289,7 +1314,32 @@ def _does_#0
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_dictaddb_($54) // CALL
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_dictaddw_(@_pbcdoes_) // Fills in code address reserved in _compbuilds_
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_dictaddb_($5C) // RET
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// End of BUILDS, beginning of DOES> code
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// End of <BUILDS, beginning of DOES> code
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fin
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end
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def _dodefer_#0
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_execword_(*(W + 2)) // Exec deferred word
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end
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def _defer_#0
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newdict
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_dictaddb_(RTS); _dictaddb_(0) // NO-OP and space for deferred pfa
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addhash(latest)
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end
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def _is_(a)#0
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word dentry
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dentry = find(nextword(' '))
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if dentry
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if ^_ffa_(a) & itc_flag
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*_cfa_(dentry) = @_dodefer_
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*_pfa_(dentry) = a
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^(_ffa_(dentry)) = ^(_ffa_(dentry)) | itc_flag
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else // comp_pbc_flag
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*_cfa_(dentry) = *_cfa_(a)
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fin
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else
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puts(a); puts(" Not found")
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_quit_
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fin
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end
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def _docolon_#0
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@ -1299,14 +1349,41 @@ def _colon_#0
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newdict
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state = state | comp_mode
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if state & comp_itc_flag
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^(_ffa_(vlist)) = itc_flag | showcr_flag
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*(_cfa_(vlist)) = @_docolon_
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^(_ffa_(latest)) = itc_flag | showcr_flag
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*(_cfa_(latest)) = @_docolon_
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else // comp_pbc_flag
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^(_ffa_(vlist)) = showcr_flag
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^(_ffa_(latest)) = showcr_flag
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_dictaddb_(JSR); _dictaddw_(vmvect)
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fin
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if state & trace_flag
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puts(vlist); putc(' ')
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puts(latest); putc(' ')
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fin
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end
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def _noname_#0
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word bldptr, plist
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plist = latest
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latest = heapmark
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^latest = 0 // Anonymous definition
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bldptr = latest + 1
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||||
^bldptr = 0 // Flags
|
||||
bldptr++
|
||||
*bldptr = plist; // Link ptr
|
||||
bldptr = bldptr + 2
|
||||
*bldptr = 0; // Hash ptr
|
||||
bldptr = bldptr + 2
|
||||
*bldptr = bldptr + 2 // Point CFA to PFA
|
||||
heapalloc(bldptr - latest + 2)
|
||||
state = state | comp_mode
|
||||
if state & comp_itc_flag
|
||||
^(_ffa_(latest)) = itc_flag | showcr_flag
|
||||
*(_cfa_(latest)) = @_docolon_
|
||||
else // comp_pbc_flag
|
||||
^(_ffa_(latest)) = showcr_flag
|
||||
_dictaddb_(JSR); _dictaddw_(vmvect)
|
||||
fin
|
||||
if state & trace_flag
|
||||
puts(latest); putc(' ')
|
||||
fin
|
||||
end
|
||||
def _exit_#0
|
||||
@ -1321,7 +1398,11 @@ def _semi_#0
|
||||
if state & comp_itc_flag // Add double zero at end of definition for SHOW
|
||||
_dictaddw_(0)
|
||||
fin
|
||||
addhash(vlist)
|
||||
if ^latest
|
||||
addhash(latest) // COLON definition
|
||||
else
|
||||
(@push)(latest)#0 // NONAME definition
|
||||
fin
|
||||
state = state & ~comp_flag
|
||||
end
|
||||
def _compile_#0
|
||||
@ -1359,13 +1440,13 @@ def _compon_#0
|
||||
state = state | comp_mode
|
||||
end
|
||||
def _componly_#0
|
||||
^_ffa_(vlist) = ^_ffa_(vlist) | componly_flag
|
||||
^_ffa_(latest) = ^_ffa_(latest) | componly_flag
|
||||
end
|
||||
def _interponly_#0
|
||||
^_ffa_(vlist) = ^_ffa_(vlist) | interponly_flag
|
||||
^_ffa_(latest) = ^_ffa_(latest) | interponly_flag
|
||||
end
|
||||
def _immediate_#0
|
||||
^_ffa_(vlist) = ^_ffa_(vlist) | imm_flag
|
||||
^_ffa_(latest) = ^_ffa_(latest) | imm_flag
|
||||
end
|
||||
def _branch_#0
|
||||
IIP = *IIP
|
||||
@ -1377,6 +1458,9 @@ def _0branch_(a)#0
|
||||
IIP = *IIP
|
||||
fin
|
||||
end
|
||||
def _recurse_#0
|
||||
_compword_(latest)
|
||||
end
|
||||
def _if_#0
|
||||
_compword_(@d_0branch)
|
||||
_tors_(heapalloc(2)) // Save backfill address
|
||||
@ -1563,10 +1647,10 @@ def _forget_#0
|
||||
dentry = find(nextword(' '))
|
||||
if dentry
|
||||
if isult(dentry, startheap)
|
||||
vlist = @d_vlist
|
||||
latest = @d_words
|
||||
dentry = startheap
|
||||
else
|
||||
vlist = *_lfa_(dentry)
|
||||
latest = *_lfa_(dentry)
|
||||
fin
|
||||
heaprelease(dentry)
|
||||
buildhashtbl
|
||||
@ -1772,16 +1856,24 @@ def _ifendsrc_(a)#0
|
||||
endsrc
|
||||
fin
|
||||
end
|
||||
def _show_#0
|
||||
def _see_#0
|
||||
word dentry, pfa, w
|
||||
|
||||
dentry = find(nextword(' '))
|
||||
if dentry and ^_ffa_(dentry) & itc_flag // Only show ITC words
|
||||
if *_cfa_(dentry) == @_docolon_
|
||||
pfa = _pfa_(dentry)
|
||||
else // @d_dodoes
|
||||
pfa = *_pfa_(dentry)
|
||||
fin
|
||||
when *_cfa_(dentry)
|
||||
is @_docolon_
|
||||
pfa = _pfa_(dentry)
|
||||
break
|
||||
is @_dodefer_
|
||||
pfa = *_pfa_(*_pfa_(dentry))
|
||||
break
|
||||
is @_dodoes_
|
||||
pfa = *_pfa_(dentry)
|
||||
break
|
||||
otherwise // ???
|
||||
pfa = @d_exit
|
||||
wend
|
||||
putc('$'); puth(pfa); putc(' ')
|
||||
w = *pfa
|
||||
while w
|
||||
@ -1826,7 +1918,7 @@ def _show_#0
|
||||
puts("EXIT\n")
|
||||
fin
|
||||
end
|
||||
def _showstack_#0
|
||||
def _prstack_#0
|
||||
word val
|
||||
byte depth
|
||||
|
||||
@ -1835,7 +1927,7 @@ def _showstack_#0
|
||||
puti(val); putc(' ')
|
||||
next
|
||||
end
|
||||
def _showrstack_#0
|
||||
def _prrstack_#0
|
||||
byte depth
|
||||
|
||||
depth = RSTK_SIZE - 1
|
||||
@ -1910,23 +2002,25 @@ def typelist(typestr, typemask, type)#0
|
||||
|
||||
puts(typestr)
|
||||
tab = ^typestr
|
||||
d = vlist
|
||||
d = latest
|
||||
while d
|
||||
if (typemask & ^_ffa_(d)) == type
|
||||
tab = tab + 1 + ^d
|
||||
if tab > 39
|
||||
putln;
|
||||
tab = ^d
|
||||
else
|
||||
puts(" ")
|
||||
if ^d // Skip NONAME definitions
|
||||
if (typemask & ^_ffa_(d)) == type
|
||||
tab = tab + 1 + ^d
|
||||
if tab > 39
|
||||
putln;
|
||||
tab = ^d
|
||||
else
|
||||
puts(" ")
|
||||
fin
|
||||
puts(d)
|
||||
if conio:keypressed(); conio:getkey(); conio:getkey(); fin
|
||||
fin
|
||||
puts(d)
|
||||
if conio:keypressed(); conio:getkey(); conio:getkey(); fin
|
||||
fin
|
||||
d = *_lfa_(d)
|
||||
loop
|
||||
end
|
||||
def _vlist_#0
|
||||
def _words_#0
|
||||
putln
|
||||
typelist("Compile only: ", componly_flag, componly_flag)
|
||||
putln; putln
|
||||
@ -1992,22 +2086,22 @@ fin
|
||||
// Compile ITC version of inline words ( speeds it up a smidge )
|
||||
//
|
||||
vmvect = *(@divmod + 1) // Hack - get VM entry vector from divmod
|
||||
vlist = @d_vlist
|
||||
while vlist
|
||||
if *_cfa_(vlist) == 0
|
||||
*_cfa_(vlist) = heapmark
|
||||
latest = @d_words
|
||||
while latest
|
||||
if *_cfa_(latest) == 0
|
||||
*_cfa_(latest) = heapmark
|
||||
_dictaddb_(JSR); _dictaddw_(vmvect)
|
||||
if ^_ffa_(vlist) & inline_flag
|
||||
_dictaddb_(^_pfa_(vlist))
|
||||
elsif ^_ffa_(vlist) & inlinew_flag
|
||||
_dictaddw_(*_pfa_(vlist))
|
||||
if ^_ffa_(latest) & inline_flag
|
||||
_dictaddb_(^_pfa_(latest))
|
||||
elsif ^_ffa_(latest) & inlinew_flag
|
||||
_dictaddw_(*_pfa_(latest))
|
||||
else
|
||||
puts(vlist); puts(": Invalid dictionary\n")
|
||||
puts(latest); puts(": Invalid dictionary\n")
|
||||
return -1
|
||||
fin
|
||||
_dictaddb_($5C) // RET
|
||||
fin
|
||||
vlist = *_lfa_(vlist)
|
||||
latest = *_lfa_(latest)
|
||||
loop
|
||||
_estkl = ^(@syscall + 1) // Hack to fill in parameter stack locations
|
||||
_estkh = ^(@syscall + 3)
|
||||
@ -2028,6 +2122,9 @@ while ^inptr and ^(inptr + 1) == '-'
|
||||
is 'T' // Trace flag
|
||||
_tron_
|
||||
break
|
||||
otherwise
|
||||
puts("Usage: +PLFORTH [-T] [-F] [SCRIPT NAME]\n")
|
||||
return 0
|
||||
wend
|
||||
inptr = argNext(inptr)
|
||||
loop
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user