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from rpython.rlib.jit import JitDriver
class W_Object:
def getrepr(self):
"""
Return an RPython string which represent the object
"""
raise NotImplementedError
def is_true(self):
raise NotImplementedError
def add(self, w_other):
raise NotImplementedError
class W_IntObject(W_Object):
def __init__(self, intvalue):
self.intvalue = intvalue
def getrepr(self):
return str(self.intvalue)
def is_true(self):
return self.intvalue != 0
def add(self, w_other):
if isinstance(w_other, W_IntObject):
sum = self.intvalue + w_other.intvalue
return W_IntObject(sum)
else:
raise OperationError
def sub(self, w_other):
if isinstance(w_other, W_IntObject):
sum = self.intvalue - w_other.intvalue
return W_IntObject(sum)
else:
raise OperationError
class W_StringObject(W_Object):
def __init__(self, strvalue):
self.strvalue = strvalue
def getrepr(self):
return self.strvalue
def is_true(self):
return len(self.strvalue) != 0
class OperationError(Exception):
pass
# ____________________________________________________________
CONST_INT = 1
POP = 2
ADD = 3
RETURN = 4
JUMP_IF = 5
DUP = 6
SUB = 7
NEWSTR = 8
# ____________________________________________________________
def get_printable_location(pc, bytecode):
return str(pc)
jitdriver = JitDriver(greens=['pc', 'bytecode'],
reds=['self'],
virtualizables=['self'],
get_printable_location=get_printable_location)
class Frame(object):
_virtualizable_ = ['stackpos', 'stack[*]']
def __init__(self, bytecode):
self.bytecode = bytecode
self.stack = [None] * 8
self.stackpos = 0
def push(self, w_x):
self.stack[self.stackpos] = w_x
self.stackpos += 1
def pop(self):
stackpos = self.stackpos - 1
assert stackpos >= 0
self.stackpos = stackpos
res = self.stack[stackpos]
self.stack[stackpos] = None
return res
def interp(self):
bytecode = self.bytecode
pc = 0
while pc < len(bytecode):
jitdriver.jit_merge_point(bytecode=bytecode, pc=pc, self=self)
opcode = ord(bytecode[pc])
pc += 1
if opcode == CONST_INT:
value = ord(bytecode[pc])
pc += 1
w_z = W_IntObject(value)
self.push(w_z)
elif opcode == POP:
self.pop()
elif opcode == DUP:
w_x = self.pop()
self.push(w_x)
self.push(w_x)
elif opcode == ADD:
w_y = self.pop()
w_x = self.pop()
w_z = w_x.add(w_y)
self.push(w_z)
elif opcode == SUB:
w_y = self.pop()
w_x = self.pop()
w_z = w_x.sub(w_y)
self.push(w_z)
elif opcode == JUMP_IF:
target = ord(bytecode[pc])
pc += 1
w_x = self.pop()
if w_x.is_true():
pc = target
jitdriver.can_enter_jit(bytecode=bytecode, pc=pc, self=self)
elif opcode == NEWSTR:
char = bytecode[pc]
pc += 1
w_z = W_StringObject(char)
self.push(w_z)
elif opcode == RETURN:
w_x = self.pop()
assert self.stackpos == 0
return w_x
else:
assert False, 'Unknown opcode: %d' % opcode
def run(bytecode, w_arg):
frame = Frame(bytecode)
frame.push(w_arg)
w_result = frame.interp()
return w_result
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