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'''https://en.wikipedia.org/wiki/Brainfuck#Commands''' | |
import sys, mit | |
mit.State().globalize(globals()) | |
def ass_inc(): ass(LIT_1); ass(ADD) | |
def ass_dec(): ass(LIT_1); ass(NEGATE); ass(ADD) | |
def ass_dup(): ass(LIT_0); ass(DUP); | |
def ass_over(): ass(LIT_1); ass(DUP); | |
def ass_loadb(): ass(LIT_0); ass(LOAD); | |
def ass_storeb(): ass(LIT_0); ass(STORE); | |
lit(0) # Data pointer. | |
stack = [] # [(start of loop, word to patch)] | |
for c in sys.stdin.read(): | |
if c == '>': ass_inc() | |
elif c == '<': ass_dec() | |
elif c == '+': ass_dup(); ass_loadb(); ass_inc(); ass_over(); ass_storeb() | |
elif c == '-': ass_dup(); ass_loadb(); ass_dec(); ass_over(); ass_storeb() | |
elif c == '.': | |
ass_dup() # buffer | |
ass(LIT_1) # length | |
lit(LIB_C_STDOUT); ass_extra(LIB_C, type=BRANCH) | |
lit(LIB_C_WRITE); ass_extra(LIB_C, type=BRANCH) | |
ass(LIT_1); ass(POP); | |
elif c == ',': | |
ass_dup() # buffer | |
ass(LIT_1) # length | |
lit(LIB_C_STDIN); ass_extra(LIB_C, type=BRANCH) | |
lit(LIB_C_READ); ass_extra(LIB_C, type=BRANCH) | |
ass(LIT_1); ass(POP); | |
elif c == '[': | |
loop = label() | |
ass_dup() | |
ass_loadb() | |
lit(0xDEADBEEF) | |
patch = assembler.pc - mit.word_bytes | |
ass(BRANCHZ) | |
stack.append((loop, patch)) | |
elif c == ']': | |
loop, patch = stack.pop() | |
lit(loop) | |
ass(BRANCH) | |
M_word[patch] = label() | |
ass_extra(EXTRA_HALT) | |
M_word[mit.word_bytes] = label() # Patch data pointer. | |
save(sys.argv[1]) |
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