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splc.py
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splc.py
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#!/usr/bin/python3
import re
import sys
# 总共的reg数量
num_registers = 10
# 预存的reg数，用来转移和计算的为号码大于11的寄存器
save_reg = 11
# 无法通过±实现栈的存取，200及以上为栈中存变量的部分，0-199为调用函数时预留的栈空间，此处没有左移2，在函数中调用时有
max_var_num = 200
register_table = [None] * num_registers
# 留一个0，避免变量或者函数调用占据（也可以去掉）
stack = ['empty']
data = """.data
array: .space 400
_prmpt: .asciiz "Enter an integer:"
_eol: .asciiz "\\n"
.globl main
.text"""
# 用来打印，读取，$8在预存的寄存器中，在调用之后会从$8转移到特定变量
pre = """read:
li $v0, 4
move $s6, $a0
la $a0, _prmpt
syscall
move $a0, $8
li $v0, 5
syscall
jr $ra
write:
li $v0, 1
syscall
li $v0, 4
move $8, $a0
la $a0, _eol
syscall
jr $ra"""
function_params: "dict[str, list[str]]" = {} # {id->[v1,v2,...]}
# 先读一遍，把函数中要调用的参数收集好
def collect_params(ir_path) -> None:
with open(ir_path, 'r') as ir:
params = []
for tac in ir.read().splitlines():
if 'FUNCTION' in tac:
params = []
func = tac.split()[1]
function_params[func] = params
elif 'PARAM' in tac:
param = tac.split()[1]
params.append(param)
collect_params(sys.argv[1])
num_var = 0
# the register allocation algorithm
# 分配+查询reg
def reg(var: str) -> str:
try:
if var == '0':
return '$0'
int(var)
return var
except:
reg = find_reg(var)
if reg:
return reg
# # 尝试分配一个未被使用的寄存器
# for index, reg in enumerate(register_table):
# if not reg:
# register_table[index] = var
# return f'${index + save_reg +1 }'
# 如果没有可用寄存器，将变量存储到栈上
stack.append(var)
return f'{stack.index(var) + max_var_num << 2}($sp)'
def find_reg(var: str):
if var in register_table:
return f'${register_table.index(var) + save_reg}'
elif var in stack:
return f'{(stack.index(var) + max_var_num) << 2}($sp)'
else:
return None
# 把栈上的变量存到另一个栈上变量
def from_heap2heap(wf, wt, fi_command):
fi_command.append(f'lw ${save_reg}, {wf}')
fi_command.append(f'sw ${save_reg}, {wt}')
# 把寄存器的值存到栈上
# 小于$sp原本值进行操作时，不会报错，但不会有效果（可能是我mars的特定效果？）
def lw_stackfreg(fi_command, desreg, reg1=save_reg - 2, reg2=save_reg - 1):
fi_command.append(f'lw {desreg},0(${reg2})')
fi_command.append(f'addi ${reg1},${reg1},-4')
fi_command.append(f'add ${reg2},${reg1},$sp')
# 把在栈的值存到目标寄存器上
def sw_stackfreg(fi_command, desreg, reg1=save_reg - 2, reg2=save_reg - 1):
fi_command.append(f'addi ${reg1},${reg1},4')
fi_command.append(f'add ${reg2},${reg1},$sp')
fi_command.append(f'sw {desreg},0(${reg2})')
# 把在栈的值存到栈上
def lw_stack2stack(fi_command, des, reg1=save_reg - 2, reg2=save_reg - 1):
fi_command.append(f'lw ${save_reg},0(${reg2})')
fi_command.append(f'sw ${save_reg},{des}')
fi_command.append(f'addi ${reg1},${reg1},-4')
fi_command.append(f'add ${reg2},${reg1},$sp')
# 把在栈上的值存到在栈的变量里
def sw_stack2stack(fi_command, fr, reg1=save_reg - 2, reg2=save_reg - 1):
fi_command.append(f'addi ${reg1},${reg1},4')
fi_command.append(f'add ${reg2},${reg1},$sp')
fi_command.append(f'lw ${save_reg},{fr}')
fi_command.append(f'sw ${save_reg},0(${reg2})')
arg_stack = [] # store the `ARG x` in order, need to be popped before invoking subfunction
active_vars = set() # the active variables in current function, need to be stored to memory before invoking subfunction
# Translate TAC to assembly code
def translate(tac: str) -> "list[str]":
global active_vars
id = '[^\\d#*]\\w*'
num = '#\\d+'
id_num = f'({id}|{num})'
command = []
fi_command = []
if re.fullmatch(f'{id} := .+', tac): # x := ...
x, _ = tac.split(' := ')
active_vars.add(x)
if re.fullmatch(f'{id} := {num}', tac): # x := #k
x, k = tac.split(' := #')
command.append(f'li {reg(x)}, {k}')
if re.fullmatch(f'{id} := {id}', tac): # x := y
x, y = tac.split(' := ')
command.append(f'move {reg(x)}, {reg(y)}')
if re.fullmatch(fr'{id} := {id_num} \+ {num}', tac): # x := y + #k
x, y, k = re.split(r' := #?| \+ #', tac)
if y.isdigit():
resn = int(y) + int(k)
if resn > 32767:
fi_command.append(f'li ${save_reg + 2},0')
while resn > 32767:
command.append(f'addi ${save_reg + 2}, ${save_reg + 2}, {32767}')
resn = resn - 32767
command.append(f'addi ${save_reg + 2}, ${save_reg + 2}, {resn}')
command.append(f'move {reg(x)}, ${save_reg + 2}')
else:
command.append(f'li {reg(x)}, {resn}')
else:
n = int(k)
while n > 32767:
command.append(f'addi {reg(y)}, {reg(y)}, {32767}')
n = n - 32767
command.append(f'addi {reg(x)}, {reg(y)}, {n}')
elif re.fullmatch(fr'{id} := {num} \+ {id}', tac): # x := #y + k
x, y, k = re.split(r' := #| \+ ', tac)
n = int(y)
while n > 32767:
command.append(f'addi {reg(k)}, {reg(k)}, {32767}')
n = n - 32767
command.append(f'addi {reg(x)}, {reg(k)}, {n}')
elif re.fullmatch(fr'{id} := {id_num} \+ {id}', tac): # x := y + z
x, y, z = re.split(r' := | \+ ', tac)
command.append(f'add {reg(x)}, {reg(y)}, {reg(z)}')
if re.fullmatch(f'{id} := {id_num} - {num}', tac): # x := y - #k
x, y, k = re.split(' := #?| - #', tac)
if reg(y).isdigit():
resn = int(y) - int(k)
if resn < -32767:
fi_command.append(f'li ${save_reg + 2},0')
while resn < -32767:
command.append(f'addi ${save_reg + 2}, ${save_reg + 2}, {-32767}')
resn = resn + 32767
command.append(f'addi ${save_reg + 2}, ${save_reg + 2}, {resn}')
command.append(f'move {reg(x)}, ${save_reg+2}')
else:
command.append(f'li {reg(x)}, {resn}')
else:
n = -int(k)
while n < -32767:
command.append(f'addi {reg(y)}, {reg(y)}, {-32767}')
n = n + 32767
command.append(f'addi {reg(x)}, {reg(y)}, {n}')
elif re.fullmatch(f'{id} := {num} - {id}', tac): # x := #y - k
x, y, k = re.split(' := #| - ', tac)
n = int(y)
while n > 32767:
command.append(f'addi {reg(k)}, {reg(y)}, {32767}')
n = n - 32767
command.append(f'addi {reg(x)}, {reg(k)}, -{n}')
command.append(f'sub {reg(x)}, $0, {reg(x)}')
elif re.fullmatch(f'{id} := {id_num} - {id}', tac): # x := y - z
x, y, z = re.split(' := | - ', tac)
command.append(f'sub {reg(x)}, {reg(y)}, {reg(z)}')
if re.fullmatch(fr'{id} := {id_num} \* {id_num}', tac): # x := y * z
x, y, z = re.split(r' := #?| \* #?', tac)
if reg(y).isdigit():
if reg(z).isdigit():
command.append(f'li {reg(x)}, {int(y) * int(z)}')
else:
fi_command.append(f'li ${save_reg + 1}, {y}')
fi_command.append(f'lw ${save_reg + 2}, {reg(z)}')
command.append(f'mul {reg(x)}, ${save_reg + 1}, ${save_reg + 2}')
else:
command.append(f'mul {reg(x)}, {reg(y)}, {reg(z)}')
if re.fullmatch(f'{id} := {id_num} / {id_num}', tac): # x := y / z
x, y, z = re.split(' := #?| / #?', tac)
if z.isdigit():
if reg(y).isdigit():
command.append(f'li {reg(x)}, {int(y) // int(z)}')
else:
fi_command.append(f'lw ${save_reg},{reg(y)}')
fi_command.append(f'li ${save_reg + 1},{z}')
fi_command.append(f'div ${save_reg},${save_reg + 1}')
else:
command.append(f'div {reg(y)}, {reg(z)}')
command.append(f'mflo {reg(x)}')
if re.fullmatch(fr'{id} := \*{id_num}', tac): # x := *y
x, y = tac.split(' := *')
command.append(f'lw {reg(x)}, 0({reg(y)})')
if re.fullmatch(fr'\*{id_num} := {id_num}', tac): # *x := y
_, x, y = re.split(r'\*| := ', tac)
command.append(f'sw {reg(y)}, 0({reg(x)})')
if re.fullmatch(f'GOTO {id}', tac): # GOTO x
x = tac.split('GOTO ')[1]
command.append(f'j {x}')
if re.fullmatch(f'{id} := CALL {id}', tac): # x := CALL f
x, f = tac.split(' := CALL ')
active_var_list = list(active_vars)
# 1.store current active variables to memory
for v in active_var_list:
sw_stack2stack(fi_command, reg(v))
# 2.传参
for p in function_params[f]:
arg = arg_stack.pop()
if arg.isdigit():
fi_command.append(f'li ${save_reg},{arg}')
fi_command.append(f'sw ${save_reg},{reg(p)}')
else:
from_heap2heap(reg(arg), reg(p), fi_command)
fi_command.append(f'jal {f}')
# 此时返回的值存在栈上
# 3.将返回值从栈调出到v0
lw_stackfreg(fi_command, '$v0')
# 4.恢复
for v in reversed(active_var_list):
lw_stack2stack(fi_command, reg(v))
command.append(f'move {reg(x)}, $v0')
if re.fullmatch(f'RETURN {id_num}', tac): # RETURN x
_, x = re.split('RETURN #?| ', tac)
# command.append(f'move $v0, {reg(x)}')
lw_stackfreg(fi_command, '$ra')
if x.isdigit():
fi_command.append(f'li $v0,{x}')
sw_stackfreg(fi_command, '$v0')
# 把v0（返回结果）存入栈
else:
sw_stack2stack(fi_command, reg(x))
command.append(f'jr $ra')
if re.fullmatch(f'IF {id_num} < {id_num} GOTO {id}', tac): # IF x < y GOTO z
_, x, y, z = re.split('IF | < #?| GOTO ', tac)
command.append(f'blt {reg(x)}, {reg(y)}, {z}')
if re.fullmatch(f'IF {id_num} <= {id_num} GOTO {id}', tac): # IF x <= y GOTO z
_, x, y, z = re.split('IF | <= #?| GOTO ', tac)
command.append(f'ble {reg(x)}, {reg(y)}, {z}')
if re.fullmatch(f'IF {id_num} > {id_num} GOTO {id}', tac): # IF x > y GOTO z
_, x, y, z = re.split('IF | > #?| GOTO ', tac)
command.append(f'bgt {reg(x)}, {reg(y)}, {z}')
if re.fullmatch(f'IF {id_num} >= {id_num} GOTO {id}', tac): # IF x >= y GOTO z
_, x, y, z = re.split('IF | >= #?| GOTO ', tac)
command.append(f'bge {reg(x)}, {reg(y)}, {z}')
if re.fullmatch(f'IF {id_num} != {id_num}+ GOTO {id}', tac): # IF x != y GOTO z
_, x, y, z = re.split('IF | != #?| GOTO ', tac)
command.append(f'bne {reg(x)}, {reg(y)}, {z}')
if re.fullmatch(f'IF {id_num} == {id_num} GOTO {id}', tac): # IF x == y GOTO z
_, x, y, z = re.split('IF | == #?| GOTO ', tac)
command.append(f'beq {reg(x)}, {reg(y)}, {z}')
if re.fullmatch(f'FUNCTION {id} :', tac): # FUNCTION f :
f = tac.split(' ')[1]
active_vars = set() # start new function's active variables
fi_command.append(f'{f}:')
sw_stackfreg(fi_command, '$ra')
if re.fullmatch(f'LABEL {id} :', tac): # LABEL l :
l = tac.split(' ')[1]
command.append(f'{l}:')
if re.fullmatch(f'PARAM {id}', tac): # PARAM x
x = tac.split(' ')[1]
active_vars.add(x)
if re.fullmatch(f'ARG {id_num}', tac): # ARG x
_, x = re.split('ARG #?| ', tac)
# FIXME: ARG #10
arg_stack.append(x)
if re.fullmatch(f'WRITE {id_num}', tac): # WRITE x
_, x = re.split('WRITE #?| ', tac)
if x.isdigit():
fi_command.append(f'li $4,{x}')
else:
fi_command.append(f'lw $4, {reg(x)}')
fi_command.append(f'jal write')
if re.fullmatch(f'READ {id}', tac): # READ x
x = tac.split(' ')[1]
active_vars.add(x)
fi_command.append(f'jal read')
fi_command.append(f'sw $2,{reg(x)}')
for index, c in enumerate(command):
co = c.replace(',', '')
regs = [s for s in co.split()[1:] if '$' in s]
for ind, r in enumerate(regs):
if '$sp' in r:
fi_command.append(f'lw ${ind + save_reg},{r}')
c = c.replace(r, f'${ind + save_reg}')
fi_command.append(c)
if ':=' in tac:
x, _ = tac.split(' := ')
r = regs[0]
if '$sp' in r:
fi_command.append(f'sw ${save_reg},{r}')
return fi_command
if len(sys.argv) < 2:
print("Usage: splc <ir_path>")
sys.exit(1)
# 最后的结果在对应.s文件中
ir_path = sys.argv[1]
assembly_path = ir_path.replace('.ir', '.s')
with open(assembly_path, 'w') as asm:
asm.write(f'{data}\n'
f'jal main\n'
f'j end\n'
f'{pre}\n')
with open(ir_path, 'r') as ir:
for tac in ir.read().splitlines():
res = translate(tac)
if not res:
# print(f'no translate: {tac}')
pass
else:
with open(assembly_path, 'a') as asm:
asm.write("\n".join(res))
asm.write("\n")
asm.write("\n")
with open(assembly_path, 'a') as asm:
asm.write('end:')