def __init__(self, debug=False, banner=BANNER, ps1=PS1, ps2=PS2):
self.debug = debug
self.banner = banner
self.ps1 = ps1
self.ps2 = ps2
self.frame = Frame()
self.compiler = Compiler()
class Interpreter(object):
def __init__(self, debug=False, banner=BANNER, ps1=PS1, ps2=PS2):
self.debug = debug
self.banner = banner
self.ps1 = ps1
self.ps2 = ps2
self.frame = Frame()
self.compiler = Compiler()
def runstring(self, s):
ast = parse(s)
bc = self.compiler.compile(ast)
if self.debug: # pragma: no cover
print bc.dump()
return self.run(bc)
def runfile(self, filename):
f = open_file_as_stream(filename)
s = f.readall()
f.close()
return self.runstring(s)
def repl(self, banner=None, ps1=None, ps2=None): # pragma: no cover
banner = banner or self.banner
ps1 = ps1 or self.ps1
ps2 = ps2 or self.ps2
print banner
while True:
try:
s = readline(ps1).strip()
except EOFError:
break
self.runstring(s)
def run(self, bc): # noqa
frame = self.frame
code = bc.code
pc = 0
while True:
# required hint indicating this is the top of the opcode dispatch
driver.jit_merge_point(
pc=pc, code=code, bc=bc, frame=frame, self=self
)
c = ord(code[pc])
arg = ord(code[pc + 1])
pc += 2
if c == bytecode.LOAD_CONSTANT:
w_constant = bc.constants[arg]
frame.push(w_constant)
elif c == bytecode.LOAD_STRING:
w_constant = bc.strconstants[arg]
frame.push(w_constant)
elif c == bytecode.DISCARD_TOP:
frame.pop()
elif c == bytecode.RETURN:
return
elif c == bytecode.BINARY_ADD:
right = frame.pop()
left = frame.pop()
w_res = left.add(right)
frame.push(w_res)
elif c == bytecode.BINARY_LT:
right = frame.pop()
left = frame.pop()
frame.push(left.lt(right))
elif c == bytecode.JUMP_IF_FALSE:
if not frame.pop().is_true():
pc = arg
elif c == bytecode.JUMP_BACKWARD:
pc = arg
# required hint indicating this is the end of a loop
driver.can_enter_jit(
pc=pc, code=code, bc=bc, frame=frame, self=self
)
elif c == bytecode.PRINT:
item = frame.pop()
print item.str()
elif c == bytecode.ASSIGN:
frame.vars[arg] = frame.pop()
elif c == bytecode.LOAD_VAR:
frame.push(frame.vars[arg])
elif c == bytecode.LOAD_FUNC:
w_function = bc.functions[arg]
frame.push(w_function)
elif c == bytecode.CALL:
w_function = frame.pop()
frame.push(self.run(w_function.bc))
else: # pragma: no cover
# This should never happen!
assert False