245 lines
3.6 KiB
NASM
245 lines
3.6 KiB
NASM
; brainfuck_compiler_v1.asm - Brainfuck compiler for the 8086 employing some optimisations
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;
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; This file is part of the 9086 project.
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;
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; Copyright (c) 2023 Efthymios Kritikos
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <http://www.gnu.org/licenses/>.
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mov sp,#STACK
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mov bx,#bootup_msg
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mov ah,#0x02
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bootup_print:
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mov dl,[bx]
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int #0x21
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inc bx
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cmp dl,#0x0A
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jne bootup_print
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MOV SI,#prog
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MOV DI,#output_program
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;CL: write concat CH: move concat
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MOV CX,#0
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JMP COMPILE ; Moving some functions above the main switch to make shot jumps work
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;;;;;;;;; . ;;;;;;;;;
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WAS_PRINT:
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CALL FLUSH_MOVES
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CALL FLUSH_WRITES
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MOV AX,#0x02B4 ; mov $0x2,%ah
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STOSW
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MOV AX,#0x178A ; mov (%bx),%dl
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STOSW
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MOV AX,#0x21CD ; int $0x21
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STOSW
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JMP COMPILE
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;;;;;;;;; ] ;;;;;;;;;
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WAS_PR:
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CALL FLUSH_MOVES
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CALL FLUSH_WRITES
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MOV AX,#0x078a ; mov (%bx),%al
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STOSW
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MOV AX,#0x003C ; cmp $0x0,%al
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STOSW
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MOV AX,#0x0574 ; je [after the absolute short jump instruction]
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STOSW
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MOV AL,#0xb8 ; [opcode only] mov 0x????,%ax
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STOSB
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POP BX
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ADD BX,#4
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MOV [DI],BX
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INC DI
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INC DI
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SUB BX,#4
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MOV AX,#0xE0FF ; jmp *%ax
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STOSW
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MOV [BX],DI
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JMP COMPILE
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;;;;;;;;;;; ACTUAL START ;;;;;;;;;;;;;;;
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COMPILE:
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MOV AL,[SI]
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INC SI
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CMP AL,#'+
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JZ WAS_PLUS
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CMP AL,#'-
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JZ WAS_MINUS
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CMP AL,#'>
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JZ WAS_MR
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CMP AL,#'<
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JZ WAS_ML
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CMP AL,#'[
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JZ WAS_PL
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CMP AL,#']
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JZ WAS_PR
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CMP AL,#'.
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JZ WAS_PRINT
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MOV AL,#0xF4 ; hlt
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MOV [DI],AL
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MOV BX,#DATA
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MOV AX,#output_program
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JMP AX
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;;;;;;;;; + ;;;;;;;;;
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WAS_PLUS:
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CALL FLUSH_MOVES
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INC CL
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JMP COMPILE
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;;;;;;;;; - ;;;;;;;;;
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WAS_MINUS:
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CALL FLUSH_MOVES
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DEC CL
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JMP COMPILE
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;;;;;;;;; > ;;;;;;;;;
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WAS_MR:
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CALL FLUSH_WRITES
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INC CH
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JMP COMPILE
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;;;;;;;;; < ;;;;;;;;;
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WAS_ML:
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CALL FLUSH_WRITES
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DEC CH
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JMP COMPILE
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;;;;;;;;; [ ;;;;;;;;;
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WAS_PL:
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CALL FLUSH_MOVES
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; optimise [-]
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CMP WORD [SI],#0x5D2D
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JNZ ACTUAL_LOOP
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MOV CL,#0
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INC SI
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INC SI
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MOV AX,#0x07C6
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STOSW
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MOV AL,#0
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STOSB
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JMP COMPILE
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ACTUAL_LOOP:
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CALL FLUSH_WRITES
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MOV AX,#0x078a ; mov (%bx),%al
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STOSW
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MOV AX,#0x003c ; cmp $0x0,%al
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STOSW
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MOV AX,#0x0575 ; jne [after the absolute short jump instruction]
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STOSW
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MOV AL,#0xb8 ; [opcode only] mov 0x????,%ax
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STOSB
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PUSH DI
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INC DI
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INC DI
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MOV AX,#0xe0ff ; jmp *%ax
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STOSW
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JMP COMPILE
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FLUSH_WRITES:
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CMP CL,#0
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JZ WRITES_FLUSHED
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CMP CL,#1
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JZ WRITES_ADD_ONE
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CMP CL,#0xFF
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JZ WRITES_DEC_ONE
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;; General case
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MOV AX,#0x0780 ; add %cl,(%bx)
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STOSW
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MOV AL,CL
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STOSB
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JMP WRITES_FLUSHED
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WRITES_ADD_ONE:
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MOV AX,#0x07fe ; incb (%bx)
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STOSW
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JMP WRITES_FLUSHED
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WRITES_DEC_ONE:
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MOV AX,#0x0ffe ; incb (%bx)
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STOSW
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JMP WRITES_FLUSHED
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WRITES_FLUSHED:
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MOV CL,#0
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RET
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FLUSH_MOVES:
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CMP CH,#0
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JZ MOVES_FLUSHED
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CMP CH,#1
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JZ MOVES_ONE_RIGHT
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CMP CH,#0XFF
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JZ MOVES_ONE_LEFT
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;; General case
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MOV AX,#0xC381 ; ADD $....,%bx
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STOSW
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MOV AL,CH
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STOSB
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TEST CH,#0x80
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jz POSITIVE
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MOV AL,#0xFF
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STOSB
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JMP MOVES_FLUSHED
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POSITIVE:
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MOV AL,#0x00
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STOSB
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JMP MOVES_FLUSHED
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MOVES_ONE_RIGHT:
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MOV AL,#0x43 ; inc %bx
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STOSB
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JMP MOVES_FLUSHED
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MOVES_ONE_LEFT:
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MOV AL,#0x4b ; dec %bx
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STOSB
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JMP MOVES_FLUSHED
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MOVES_FLUSHED:
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MOV CH,#0
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RET
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bootup_msg: .ASCII 'Native brainfuck compiler v1\n'
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DATA: .BLKB 560
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.BLKB 200
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STACK:
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