298 lines
6.6 KiB
Python
Executable file
298 lines
6.6 KiB
Python
Executable file
#!/usr/bin/env python3
|
|
|
|
# Nga: a Virtual Machine
|
|
# Copyright (c) 2010 - 2018, Charles Childers
|
|
# Optimizations and process() rewrite by Greg Copeland
|
|
# -----------------------------------------------------
|
|
|
|
import os, sys, math, time, struct
|
|
from struct import pack, unpack
|
|
|
|
ip = 0
|
|
stack = [] * 128
|
|
address = []
|
|
memory = []
|
|
|
|
def rxDivMod( a, b ):
|
|
x = abs(a)
|
|
y = abs(b)
|
|
q, r = divmod(x, y)
|
|
if a < 0 and b < 0:
|
|
r *= -1
|
|
elif a > 0 and b < 0:
|
|
q *= -1
|
|
elif a < 0 and b > 0:
|
|
r *= -1
|
|
q *= -1
|
|
return q, r
|
|
|
|
|
|
def findEntry(named):
|
|
header = memory[2]
|
|
Done = False
|
|
while (header != 0 and not Done):
|
|
if named == extractString(header + 3):
|
|
Done = True
|
|
else:
|
|
header = memory[header]
|
|
return header
|
|
|
|
def rxGetInput():
|
|
return ord(sys.stdin.read(1))
|
|
|
|
def rxDisplayCharacter():
|
|
global stack
|
|
if stack[-1] > 0 and stack[-1] < 128:
|
|
if stack[-1] == 8:
|
|
sys.stdout.write(chr(stack.pop()))
|
|
sys.stdout.write(chr(32))
|
|
sys.stdout.write(chr(8))
|
|
else:
|
|
sys.stdout.write(chr(stack.pop()))
|
|
else:
|
|
sys.stdout.write("\033[2J\033[1;1H")
|
|
stack.pop()
|
|
sys.stdout.flush()
|
|
|
|
def i_no():
|
|
pass
|
|
|
|
def i_li():
|
|
global ip, memory, stack, address
|
|
ip += 1
|
|
stack.append( memory[ip] )
|
|
|
|
def i_du():
|
|
global ip, memory, stack, address
|
|
stack.append( stack[-1] )
|
|
|
|
def i_dr():
|
|
global ip, memory, stack, address
|
|
stack.pop()
|
|
|
|
def i_sw():
|
|
global ip, memory, stack, address
|
|
a = stack[-2]
|
|
stack[-2] = stack[-1]
|
|
stack[-1] = a
|
|
|
|
def i_pu():
|
|
global ip, memory, stack, address
|
|
address.append(stack.pop())
|
|
|
|
def i_po():
|
|
global ip, memory, stack, address
|
|
stack.append(address.pop())
|
|
|
|
def i_ju():
|
|
global ip, memory, stack, address
|
|
ip = stack.pop() - 1
|
|
|
|
def i_ca():
|
|
global ip, memory, stack, address
|
|
address.append(ip)
|
|
ip = stack.pop() - 1
|
|
|
|
def i_cc():
|
|
global ip, memory, stack, address
|
|
target = stack.pop()
|
|
if stack.pop() != 0:
|
|
address.append(ip)
|
|
ip = target - 1
|
|
|
|
def i_re():
|
|
global ip, memory, stack, address
|
|
ip = address.pop()
|
|
|
|
def i_eq():
|
|
global ip, memory, stack, address
|
|
a = stack.pop()
|
|
b = stack.pop()
|
|
if b == a:
|
|
stack.append(-1)
|
|
else:
|
|
stack.append(0)
|
|
|
|
def i_ne():
|
|
global ip, memory, stack, address
|
|
a = stack.pop()
|
|
b = stack.pop()
|
|
if b != a:
|
|
stack.append(-1)
|
|
else:
|
|
stack.append(0)
|
|
|
|
def i_lt():
|
|
global ip, memory, stack, address
|
|
a = stack.pop()
|
|
b = stack.pop()
|
|
if b < a:
|
|
stack.append(-1)
|
|
else:
|
|
stack.append(0)
|
|
|
|
def i_gt():
|
|
global ip, memory, stack, address
|
|
a = stack.pop()
|
|
b = stack.pop()
|
|
if b > a:
|
|
stack.append(-1)
|
|
else:
|
|
stack.append(0)
|
|
|
|
def i_fe():
|
|
global ip, memory, stack, address
|
|
stack[-1] = memory[stack[-1]]
|
|
|
|
def i_st():
|
|
global ip, memory, stack, address
|
|
mi = stack.pop()
|
|
memory[mi] = stack.pop()
|
|
|
|
def i_ad():
|
|
global ip, memory, stack, address
|
|
t = stack.pop()
|
|
stack[ -1 ] += t
|
|
stack[-1] = unpack('=l', pack('=L', stack[-1] & 0xffffffff))[0]
|
|
|
|
def i_su():
|
|
global ip, memory, stack, address
|
|
t = stack.pop()
|
|
stack[-1] -= t
|
|
stack[-1] = unpack('=l', pack('=L', stack[-1] & 0xffffffff))[0]
|
|
|
|
def i_mu():
|
|
global ip, memory, stack, address
|
|
t = stack.pop()
|
|
stack[-1] *= t
|
|
stack[-1] = unpack('=l', pack('=L', stack[-1] & 0xffffffff))[0]
|
|
|
|
def i_di():
|
|
global ip, memory, stack, address
|
|
a = stack[-1]
|
|
b = stack[-2]
|
|
stack[-1], stack[-2] = rxDivMod( b, a )
|
|
stack[-1] = unpack('=l', pack('=L', stack[-1] & 0xffffffff))[0]
|
|
stack[-2] = unpack('=l', pack('=L', stack[-2] & 0xffffffff))[0]
|
|
|
|
def i_an():
|
|
global ip, memory, stack, address
|
|
t = stack.pop()
|
|
stack[-1] &= t
|
|
|
|
def i_or():
|
|
global ip, memory, stack, address
|
|
t = stack.pop()
|
|
stack[-1] |= t
|
|
|
|
def i_xo():
|
|
global ip, memory, stack, address
|
|
t = stack.pop()
|
|
stack[-1] ^= t
|
|
|
|
def i_sh():
|
|
global ip, memory, stack, address
|
|
t = stack.pop()
|
|
stack[-1] <<= t
|
|
t = stack.pop()
|
|
stack[-1] >>= t
|
|
|
|
def i_zr():
|
|
global ip, memory, stack, address
|
|
if stack[-1] == 0:
|
|
stack.pop()
|
|
ip = address.pop()
|
|
|
|
def i_en():
|
|
global ip, memory, stack, address
|
|
ip = 9000000
|
|
|
|
def i_ie():
|
|
stack.push(1)
|
|
|
|
def i_iq():
|
|
stack.pop()
|
|
stack.push(0)
|
|
stack.push(0)
|
|
|
|
def i_ii():
|
|
stack.pop()
|
|
rxDisplayCharacter()
|
|
|
|
instructions = [i_no, i_li, i_du, i_dr, i_sw, i_pu, i_po, i_ju, i_ca, i_cc, i_re, i_eq, i_ne, i_lt, i_gt, i_fe, i_st, i_ad, i_su, i_mu, i_di, i_an, i_or, i_xo, i_sh, i_zr, i_en, i_ie, i_iq, i_ii]
|
|
|
|
def validateOpcode(opcode):
|
|
I0 = opcode & 0xFF
|
|
I1 = (opcode >> 8) & 0xFF
|
|
I2 = (opcode >> 16) & 0xFF
|
|
I3 = (opcode >> 24) & 0xFF
|
|
if (I0 >= 0 and I0 <= 29) and (I1 >= 0 and I1 <= 29) and (I2 >= 0 and I2 <= 29) and (I3 >= 0 and I3 <= 29):
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
def extractString( at ):
|
|
i = at
|
|
s = ''
|
|
while (memory[i] != 0):
|
|
s = s + chr(memory[i])
|
|
i = i + 1
|
|
return s
|
|
|
|
def injectString( s, to ):
|
|
global memory
|
|
i = to
|
|
for c in s:
|
|
memory[i] = ord(c)
|
|
i = i + 1
|
|
memory[i] = 0
|
|
|
|
def execute(word, output = 'console'):
|
|
global ip, memory, stack, address
|
|
ip = word
|
|
address.append(0)
|
|
notfound = memory[findEntry('err:notfound') + 1]
|
|
while ip < 100000 and len(address) > 0:
|
|
if ip == notfound:
|
|
print('ERROR: word not found!')
|
|
opcode = memory[ip]
|
|
if validateOpcode(opcode):
|
|
I0 = opcode & 0xFF
|
|
I1 = (opcode >> 8) & 0xFF
|
|
I2 = (opcode >> 16) & 0xFF
|
|
I3 = (opcode >> 24) & 0xFF
|
|
if I0 != 0: instructions[I0]()
|
|
if I1 != 0: instructions[I1]()
|
|
if I2 != 0: instructions[I2]()
|
|
if I3 != 0: instructions[I3]()
|
|
else:
|
|
print('Invalid Bytecode', opcode, ip)
|
|
ip = 2000000
|
|
ip = ip + 1
|
|
return
|
|
|
|
def load_image():
|
|
global memory
|
|
cells = int(os.path.getsize('ngaImage') / 4)
|
|
f = open( 'ngaImage', 'rb' )
|
|
memory = list(struct.unpack( cells * 'i', f.read() ))
|
|
f.close()
|
|
remaining = 1000000 - cells
|
|
memory.extend( [0] * remaining )
|
|
|
|
def run():
|
|
Done = False
|
|
Interpreter = memory[findEntry('interpret') + 1]
|
|
while not Done:
|
|
Line = input('\nOk> ')
|
|
if Line == 'bye': Done = True
|
|
else:
|
|
for Token in Line.split(' '):
|
|
injectString(Token, 1025)
|
|
stack.append(1025)
|
|
execute(Interpreter)
|
|
|
|
if __name__ == "__main__":
|
|
load_image()
|
|
run()
|
|
|