112 lines
2.1 KiB
NASM
112 lines
2.1 KiB
NASM
; *** Requirements ***
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; blockdev
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; JUMP_STRNCMP
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; JUMP_ADDDE
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; JUMP_ADDHL
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; JUMP_UPCASE
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; JUMP_UNSETZ
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; JUMP_INTODE
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; JUMP_FINDCHAR
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; RAMSTART (where we put our variables in RAM)
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; *** Code ***
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; Read file through GetC routine pointer at HL and outputs its upcodes through
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; the PutC routine pointer at DE.
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main:
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ld (ioGetCPtr), hl
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ld (ioPutCPtr), de
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ld hl, 0
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ld (curOutputOffset), hl
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.loop:
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call ioReadLine
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or a ; is A 0?
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jr z, .stop ; We have EOF
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call parseLine
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jr nz, .stop
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jr .loop
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.stop:
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ret
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#include "util.asm"
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#include "io.asm"
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#include "parse.asm"
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#include "literal.asm"
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#include "instr.asm"
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#include "directive.asm"
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.equ SYM_RAMSTART RAMSTART
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#include "symbol.asm"
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; Increase (curOutputOffset) by A
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incOutputOffset:
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push de
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ld de, (curOutputOffset)
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call JUMP_ADDDE
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ld (curOutputOffset), de
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pop de
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ret
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; Parse line in (HL), write the resulting opcode(s) in (DE) and increases
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; (curOutputOffset) by the number of bytes written. Advances HL where
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; tokenization stopped and DE to where we should write the next upcode.
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; Sets Z if parse was successful, unset if there was an error or EOF.
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parseLine:
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push bc
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call tokenize
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ld a, b ; TOK_*
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cp TOK_INSTR
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jr z, .instr
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cp TOK_DIRECTIVE
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jr z, .direc
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cp TOK_LABEL
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jr z, .label
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cp TOK_EMPTY
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jr z, .success ; empty line? do nothing but don't error out.
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jr .error ; token not supported
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.instr:
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ld a, c ; I_*
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call parseInstruction
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or a ; is zero?
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jr z, .error
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call incOutputOffset
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ld b, a
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ld hl, instrUpcode
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.loopInstr:
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ld a, (hl)
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call ioPutC
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inc hl
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djnz .loopInstr
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jr .success
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.direc:
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ld a, c ; D_*
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call parseDirective
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call incOutputOffset
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ld b, a
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ld hl, direcData
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.loopDirec:
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ld a, (hl)
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call ioPutC
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inc hl
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djnz .loopDirec
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jr .success
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.label:
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; The string in (scratchpad) is a label with its trailing ':' removed.
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ld hl, scratchpad
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ld de, (curOutputOffset)
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call symRegister
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jr .success
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.success:
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xor a ; ensure Z
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jr .end
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.error:
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call JUMP_UNSETZ
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.end:
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pop bc
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ret
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; *** Variables ***
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; The offset where we currently are with regards to outputting opcodes
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curOutputOffset:
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.fill 2
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