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pl0.py
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from codegen import *
import sys
def get_op(code):
return code[0]
def get_l(code):
return code[1]
def get_m(code):
return code[2]
def pl0(codes):
def base(bar):
b = bp
for i in range(0,bar):
b = stack[b-1];
return b
pc,sp,ar,bp = 0,0,0,1
flag = False
stack = [0] * 1000
lever = [-1] * 20
lever[0] = 0
while pc < len(codes) and ar >= 0:
code = codes[pc]
print (code)
pc += 1
op,l,m = get_op(code),get_l(code),get_m(code)
if op == 'LIT':
stack[sp] = m
sp += 1
elif op == 'OPR':
if m == 'OPR_RET':
sp = bp - 1
bp,pc = stack[sp+1],stack[sp+2]
lever[ar] = -1
ar -= 1
elif m == 'OPR_NEG':
stack[sp - 1] = - stack[sp - 1]
elif m == 'OPR_ADD':
sp -= 1
stack[sp - 1] += stack[sp]
elif m == 'OPR_SUB':
sp -= 1
stack[sp - 1] -= stack[sp]
elif m == 'OPR_MUL':
sp -= 1
stack[sp - 1] *= stack[sp]
elif m == 'OPR_DIV':
sp -= 1
stack[sp - 1] /= stack[sp]
elif m == 'OPR_ODD':
stack[sp - 1] = int(stack[sp - 1])%2
elif m == 'OPR_MOD':
sp -= 1
stack[sp - 1] %= stack[sp]
elif m == 'OPR_EQL':
sp -= 1
if stack[sp] == stack[sp -1]:
stack[sp - 1] = 1
else:
stack[sp - 1] = 0
elif m == 'OPR_NEQ':
sp -= 1
if stack[sp] == stack[sp - 1]:
stack[sp - 1] = 0
else:
stack[sp - 1] = 1
elif m == 'OPR_LSS':
sp -= 1
if stack[sp - 1] < stack[sp]:
stack[sp - 1] = 1
else:
stack[sp - 1] = 0
elif m == 'OPR_LEQ':
sp -= 1
if stack[sp - 1] <= stack[sp]:
stack[sp - 1] = 1
else:
stack[sp - 1] = 0
elif m == 'OPR_GTR':
sp -= 1
if stack[sp - 1] > stack[sp]:
stack[sp - 1] = 1
else:
stack[sp - 1] = 0
elif m == 'OPR_GEQ':
sp -= 1
if stack[sp - 1] >= stack[sp]:
stack[sp - 1] = 1
else:
stack[sp - 1] = 0
else:
pass
elif op == 'LOD':
stack[sp] = stack[base(l)-1+m]
sp +=1
elif op == 'STO':
sp -= 1
stack[base(l)-1+m] = stack[sp]
elif op == 'CAL':
stack[sp] = base(l)
stack[sp+1],stack[sp+2] = bp,pc
bp,pc = sp + 1,m
lever[ar] = sp
for i in range(0,ar):
lever[ar] -= lever[i]
ar += 1
lever[ar] = 3
elif op == 'INC':
sp += m
elif op == 'JMP':
pc = m
elif op == 'JPC':
sp -= 1
if stack[sp] == 0:
pc = m
elif op == 'SIO_OUT':
flag = True
elif op == 'SIO_IN':
flag = True
else:
print ("Error in code {0}".format(pc))
print (pc,bp,sp,ar,stack[0:sp])
if flag == True:
if op == 'SIO_OUT':
sp -= 1
print (stack[sp])
if op == 'SIO_IN':
stack[sp] = input()
sp += 1
flag =False
if __name__ == '__main__':
print(len(sys.argv))
if len(sys.argv) != 2:
print('Usage: python pl0.py filepath!')
exit(1)
ast = pl0_parse(sys.argv[1])
codegen(ast)
print(len(code))
for ins in code:
print(ins)
pl0(code)