239 lines
4.6 KiB
Plaintext
Executable file
239 lines
4.6 KiB
Plaintext
Executable file
s" defs.jrt" loadfile
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s" asm.jrt" loadfile
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( tinyjort calling convention:
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SP - data stack pointer, grows down
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BP - return stack pointer, grows up
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SI - instruction pointer
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BX - W register - code pointer for current word
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all other registers can and will be clobbered.
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DF must be cleared before calling NEXT, as LODSW is used to
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increment the instruction pointer.
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)
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JMP 9 @>
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: NEXT
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LODSW
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MOV BX AX
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JMP @[ BX] ;
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( dictionary format:
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DICTIONARY - an array of 16 pointers to linked lists of entries.
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The dictlist for a given word is chosen by taking the
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first character of the word and taking its first 4
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bits.
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Entry:
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LINK - pointer to next word in the dictionary
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FLAGS - byte
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LENGTH - byte
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NAME - bytes ending in \0
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CODE POINTER - pointer to machine code routine )
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L: DICTIONARY
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0 w>t 0 w>t 0 w>t 0 w>t 0 w>t 0 w>t 0 w>t 0 w>t
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0 w>t 0 w>t 0 w>t 0 w>t 0 w>t 0 w>t 0 w>t 0 w>t
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L: LATEST 0 w>t
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: savelabel ( word -- )
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here swap begin dup b@ dup while b, 1 + repeat b, drop lastlabel ! ;
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: DICTLIST ( word -- tptr ) b@ 0x0f & cells [ L@ DICTIONARY lit ] + ;
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: strlen ( word -- len ) 0 swap begin dup b@ while swap 1 + swap 1 + repeat drop ;
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: str>t ( word -- ) begin dup b@ dup while >t 1 + repeat >t drop ;
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: link>t ( tptr-head -- ) dup @t swap target @ swap !t w>t ;
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: DEF word dup savelabel dup DICTLIST link>t 0 >t dup strlen >t str>t ;
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: WORD= ( word len tptr -- f )
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3 + dup b@t <rot != if 2drop 0 return then 1 + ( word tword )
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begin over b@ over b@t = while
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over b@ not if 2drop 1 return then ( 0 byte, matched )
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1 + swap 1 + swap
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repeat 2drop 0 ;
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: t' word dup strlen over DICTLIST ( word len tptr-next-entry )
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begin dup while 3dup WORD= if 5 + + swap drop return then @t repeat
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drop drop drop 0 ;
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: :ASM DEF target @ 2 + w>t ;
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L: $$CONST
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INC BX INC BX
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PUSH @[ BX]
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NEXT
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: CONST DEF [ L@ $$CONST lit ] w>t w>t ;
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L@ DICTIONARY CONST dictionary
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L@ LATEST CONST latest
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L: $$VAR
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INC BX INC BX
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PUSH BX
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NEXT
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: ARRAY DEF [ L@ $$VAR lit ] w>t ;
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: VAR, ARRAY w>t ;
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( "codepointer words" that evaluate to a pointer to the assembly -
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useful to define things like $DOCOLON. )
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: :CP ARRAY ;
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L@ $$VAR CONST $DOVAR
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:CP $DOCOLON
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L: $$COLON
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MOV @[ BP] SI
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INC BP INC BP
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INC BX INC BX
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MOV SI BX
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NEXT
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:ASM return
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DEC BP DEC BP
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MOV @[ BP] SI
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NEXT
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:CP $DODEFERRED
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INC BX INC BX
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MOV BX @[ BX]
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JMP @[ BX]
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:ASM LIT_
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LODSW
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PUSH AX
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NEXT
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:ASM BZ_
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POP CX
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JCXZ 0 @>
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LODSW
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NEXT
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L: GOTO_IMPL 0 <:
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LODSW
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MOV SI AX
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NEXT
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DEF GOTO_ L@ GOTO_IMPL w>t
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L: BASE 10 w>t
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:ASM number ( str -- num 1 | str 0 )
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( AX - current number
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BX - saved IP, as SI will be clobbered by LODSB
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CX - current digit count, used to detect 0x prefix
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DX - clobbered by IMUL
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SI - remainder of string to be parsed )
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MOV BX SI ( save IP )
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POP SI
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PUSH SI
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MOV BASE 10 #
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XOR AX AX
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XOR CX CX
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L: next-digit
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IMUL BASE
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MOV BL AL
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LODSB
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CMP AL 0 #
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JZ 1 @> ( string end )
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CMP AL key 9 #
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JG 2 @> ( hex or fail )
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SUB AL key 0 #
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JL 0 @> ( not a number )
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L: parsed-digit
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ADD BL AL
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ADC AH 0 #
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INC CX
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JMP next-digit
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L: fail-digit 0 <:
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MOV SI BX
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PUSH 0 #
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NEXT
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1 <: ( string end )
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JCXZ fail-digit ( empty string is not zero )
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MOV SI BX
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POP DX
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PUSH AX
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PUSH 1 #
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NEXT
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2 <: ( hex or fail )
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CMP AL key x ( lowercase x )
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JNZ 0 @>
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CMP CX 1 # ( x is second character )
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JNZ 1 @>
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CMP BL 0 # ( first character was a 0 )
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JNZ 2 @>
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MOV BASE 16 #
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JMP next-digit
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0 <: 1 <: 2 <: ( actual parsing of hex digit )
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SUB AL key A #
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JL fail-digit
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ADD AL 10 #
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CMP AL BASE
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JL parsed-digit
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SUB AL key a key A - 10 - #
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JL fail-digit
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ADD AL 10 #
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CMP AL BASE
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JL parsed-digit
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JMP fail-digit
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:ASM drop
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POP AX
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NEXT
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:ASM dup
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POP AX
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PUSH AX
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PUSH AX
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NEXT
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:ASM swap
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POP AX
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POP BX
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PUSH AX
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PUSH BX
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NEXT
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:ASM over
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POP AX
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POP BX
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POP BX
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POP AX
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POP BX
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NEXT
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:ASM <rot
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POP AX
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POP BX
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POP CX
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PUSH BX
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PUSH AX
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PUSH CX
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NEXT
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:ASM emit
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MOV AH 5 #
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POP DX
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INT 0x21 #
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NEXT
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:ASM terminate
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MOV AH 0x4c #
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MOV AL 0 # ( todo: pop )
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INT 0x21 #
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( test program )
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ARRAY hex65 key 0 >t key x >t key 6 >t key 5 >t 0 >t
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L: test-word L@ $$COLON w>t t' hex65 w>t t' emit w>t t' terminate w>t
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9 <: ( actual entry point )
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LEA SI test-word
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( TODO: configure stacks )
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NEXT
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.s
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s" tinyjort.com" overwrite
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0x100 target @ :noname for i tseg b@far fputc next ; execute
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close
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