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code = []
code.append('format elf64 executable 3')
code.append('entry start')
code.append('read:')
code.append('xor rax, rax')
code.append('xor rdi, rdi')
code.append('mov rsi, int_buffer')
code.append('mov rdx, 20')
code.append('syscall')
code.append('xor rcx, rcx')
code.append('mov cl, [int_buffer + rax - 1]')
code.append('cmp rcx, 10')
code.append('jne newlineskip')
code.append('dec rax')
code.append('newlineskip:')
code.append('mov rsi, rax')
code.append('xor rax, rax')
code.append('cmp rsi, 0')
code.append('je skipread')
code.append('xor rcx, rcx')
code.append('mov rdi, 10')
code.append('keepreading:')
code.append('mul rdi')
code.append('mov dl, [int_buffer + rcx]')
code.append('sub rdx, 48')
code.append('add rax, rdx')
code.append('inc rcx')
code.append('cmp rcx, rsi')
code.append('jl keepreading')
code.append('skipread:')
code.append('ret')
code.append('print:')
code.append('mov [rsp - 8], rbx')
code.append('mov rax, [rsp + 8]')
code.append('mov rdi, 10')
code.append('xor rcx, rcx')
code.append('print_loop0:')
code.append('mov [int_buffer + rcx], 48')
code.append('inc rcx')
code.append('cmp rcx, 20')
code.append('jl print_loop0')
code.append('xor rbx, rbx')
code.append('xor rdx, rdx')
code.append('print_loop1:')
code.append('div rdi')
code.append('dec rcx')
code.append('inc rbx')
code.append('add [int_buffer + rcx], dl')
code.append('xor rdx, rdx')
code.append('cmp rax, 0')
code.append('jg print_loop1')
code.append('mov rax, 1')
code.append('mov rdi, 1')
code.append('lea rsi, [int_buffer + rcx]')
code.append('mov rdx, rbx')
code.append('syscall')
code.append('mov [int_buffer], 10')
code.append('mov rax, 1')
code.append('mov rdi, 1')
code.append('mov rsi, int_buffer')
code.append('mov rdx, 1')
code.append('syscall')
code.append('mov rbx, [rsp - 8]')
code.append('ret')
code.append('start:')
loop_stack = []
loop_index = -1
with open('input.stk', 'r') as f:
text = f.read()
words = text.replace('\n', ' ').strip().split(' ')
for word in words:
if word.isdecimal():
code.append('push ' + word)
elif word == '+':
code.append('pop rax')
code.append('pop rdi')
code.append('add rax, rdi')
code.append('push rax')
elif word == '-':
code.append('pop rdi')
code.append('pop rax')
code.append('sub rax, rdi')
code.append('push rax')
elif word == '++':
code.append('pop rax')
code.append('inc rax')
code.append('push rax')
elif word == '--':
code.append('pop rax')
code.append('dec rax')
code.append('push rax')
elif word == '*':
code.append('pop rax')
code.append('pop rdi')
code.append('mul rdi')
code.append('push rax')
elif word == '!':
code.append('pop rax')
elif word == '~':
code.append('pop rax')
code.append('push rax')
code.append('push rax')
elif word == '.':
code.append('call print')
code.append('pop rax')
elif word == ',':
code.append('call read')
code.append('push rax')
elif word == '[':
loop_index += 1
loop_stack.append(loop_index)
code.append('l' + str(loop_index) + ':')
code.append('cmp DWORD [rsp], 0')
code.append('je e' + str(loop_index))
elif word == ']':
loop_end = loop_stack.pop()
code.append('jmp l' + str(loop_end))
code.append('e' + str(loop_end) + ':')
code.append('pop rax')
code.append('mov rax, 60')
code.append('mov rdi, 0')
code.append('syscall')
code.append('segment writable')
code.append('int_buffer rb 20')
for line in code:
print(line)
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