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"""
Run tinyframe.py <input file> [int value reg0] [int value reg1] ...
Interpreter for a tiny interpreter with frame introspection. Supports
integer values and function values. The machine is
register based with untyped registers.
Opcodes:
ADD r1 r2 => r3 # integer addition or function combination,
# depending on argument types
# if r1 has a function f and r2 has a function g
# the result will be a function lambda arg : f(g(arg))
# this is also a way to achieve indirect call
INTROSPECT r1 => r2 # frame introspection - load a register with number
# pointed by r1 (must be int) to r2
PRINT r # print a register
CALL r1 r2 => r3 # call a function in register one with argument in r2 and
# result in r3
LOAD_FUNCTION <name> => r # load a function named name into register r
LOAD <int constant> => r # load an integer constant into register r
RETURN r1
JUMP @label # jump + or - by x opcodes
JUMP_IF_ABOVE r1 r2 @label # jump if value in r1 is above
# value in r2
function argument always comes in r0
"""
from rpython.rlib.streamio import open_file_as_stream
from rpython.jit.tl.tinyframe.support import sort
from rpython.rlib.unroll import unrolling_iterable
from rpython.rlib.jit import JitDriver, hint, dont_look_inside
opcodes = ['ADD', 'INTROSPECT', 'PRINT', 'CALL', 'LOAD', 'LOAD_FUNCTION',
'RETURN', 'JUMP', 'JUMP_IF_ABOVE']
unrolling_opcodes = unrolling_iterable(opcodes)
for i, opcode in enumerate(opcodes):
globals()[opcode] = i
class Code(object):
def __init__(self, code, regno, functions, name):
self.code = code
self.regno = regno
self.functions = functions
self.name = name
class Parser(object):
name = None
def compile(self, strrepr):
self.code = []
self.maxregno = 0
self.functions = {}
self.labels = {}
lines = strrepr.splitlines()
for line in lines:
comment = line.find('#')
if comment != -1:
assert comment >= 0
line = line[:comment]
line = line.strip(" ")
if not line:
continue
if line.endswith(':'):
# a name
self.finish_currect_code()
self.name = line[:-1]
continue
if line.startswith('@'):
self.labels[line[1:]] = len(self.code)
continue
firstspace = line.find(" ")
assert firstspace >= 0
opcode = line[:firstspace]
args = line[firstspace + 1:]
for name in unrolling_opcodes:
if opcode == name:
getattr(self, 'compile_' + name)(args)
values = self.functions.values()
sort(values)
functions = [code for i, code in values]
assert self.name == 'main'
return Code("".join([chr(i) for i in self.code]), self.maxregno + 1,
functions, self.name)
def finish_currect_code(self):
if self.name is None:
assert not self.code
return
code = Code("".join([chr(i) for i in self.code]), self.maxregno + 1,
[], self.name)
self.functions[self.name] = (len(self.functions), code)
self.name = None
self.labels = {}
self.code = []
self.maxregno = 0
def rint(self, arg):
assert arg.startswith('r')
no = int(arg[1:])
self.maxregno = max(self.maxregno, no)
return no
def compile_ADD(self, args):
args, result = args.split("=")
result = result[1:]
arg0, arg1 = args.strip(" ").split(" ")
self.code += [ADD, self.rint(arg0), self.rint(arg1),
self.rint(result.strip(" "))]
def compile_LOAD(self, args):
arg0, result = args.split("=")
result = result[1:]
arg0 = arg0.strip(" ")
self.code += [LOAD, int(arg0), self.rint(result.strip(" "))]
def compile_PRINT(self, args):
arg = self.rint(args.strip(" "))
self.code += [PRINT, arg]
def compile_RETURN(self, args):
arg = self.rint(args.strip(" "))
self.code += [RETURN, arg]
def compile_JUMP_IF_ABOVE(self, args):
arg0, arg1, label = args.split(" ")
self.code += [JUMP_IF_ABOVE, self.rint(arg0.strip(" ")),
self.rint(arg1.strip(" ")), self.labels[label[1:]]]
def compile_LOAD_FUNCTION(self, args):
name, res = args.split("=")
res = res[1:]
no, code = self.functions[name.strip(" ")]
self.code += [LOAD_FUNCTION, no, self.rint(res.strip(" "))]
def compile_CALL(self, args):
args, res = args.split("=")
res = res[1:]
arg0, arg1 = args.strip(" ").split(" ")
self.code += [CALL, self.rint(arg0.strip(" ")),
self.rint(arg1.strip(" ")),
self.rint(res.strip(" "))]
def compile_INTROSPECT(self, args):
arg, res = args.split("=")
res = res[1:]
self.code += [INTROSPECT, self.rint(arg.strip(" ")),
self.rint(res.strip(" "))]
def compile_JUMP(self, args):
raise NotImplementedError
def compile(strrepr):
parser = Parser()
return parser.compile(strrepr)
def disassemble(code):
return [ord(i) for i in code.code]
class Object(object):
def __init__(self):
raise NotImplementedError("abstract base class")
def add(self, other):
raise NotImplementedError("abstract base class")
def gt(self, other):
raise NotImplementedError("abstract base class")
def repr(self):
raise NotImplementedError("abstract base class")
class Int(Object):
def __init__(self, val):
self.val = val
def add(self, other):
return Int(self.val + other.val)
def gt(self, other):
return self.val > other.val
def repr(self):
return str(self.val)
class Func(Object):
def __init__(self, code):
self.code = code
def call(self, arg):
f = Frame(self.code, arg)
return f.interpret()
def add(self, other):
return CombinedFunc(self, other)
def repr(self):
return "<function %s>" % self.code.name
class CombinedFunc(Func):
def __init__(self, outer, inner):
self.outer = outer
self.inner = inner
def call(self, arg):
return self.outer.call(self.inner.call(arg))
def repr(self):
return "<function %s(%s)>" % (self.outer.repr(), self.inner.repr())
driver = JitDriver(greens = ['i', 'code'], reds = ['self'],
virtualizables = ['self'])
class Frame(object):
_virtualizable_ = ['registers[*]', 'code']
def __init__(self, code, arg=None):
self = hint(self, access_directly=True, fresh_virtualizable=True)
self.code = code
self.registers = [None] * code.regno
self.registers[0] = arg
def interpret(self):
i = 0
code = self.code.code
while True:
driver.jit_merge_point(self=self, code=code, i=i)
opcode = ord(code[i])
if opcode == LOAD:
self.registers[ord(code[i + 2])] = Int(ord(code[i + 1]))
i += 3
elif opcode == ADD:
arg1 = self.registers[ord(code[i + 1])]
arg2 = self.registers[ord(code[i + 2])]
self.registers[ord(code[i + 3])] = arg1.add(arg2)
i += 4
elif opcode == RETURN:
return self.registers[ord(code[i + 1])]
elif opcode == JUMP_IF_ABOVE:
arg0 = self.registers[ord(code[i + 1])]
arg1 = self.registers[ord(code[i + 2])]
tgt = ord(code[i + 3])
if arg0.gt(arg1):
i = tgt
driver.can_enter_jit(code=code, i=tgt, self=self)
else:
i += 4
elif opcode == LOAD_FUNCTION:
f = self.code.functions[ord(code[i + 1])]
self.registers[ord(code[i + 2])] = Func(f)
i += 3
elif opcode == CALL:
f = self.registers[ord(code[i + 1])]
arg = self.registers[ord(code[i + 2])]
assert isinstance(f, Func)
self.registers[ord(code[i + 3])] = f.call(arg)
i += 4
elif opcode == PRINT:
arg = self.registers[ord(code[i + 1])]
print arg.repr()
i += 2
elif opcode == INTROSPECT:
self.introspect(ord(code[i + 1]), ord(code[i + 2]))
i += 3
else:
raise Exception("unimplemented opcode %s" % opcodes[opcode])
@dont_look_inside
def introspect(self, rarg, rresult):
source = self.registers[rarg]
assert isinstance(source, Int)
self.registers[rresult] = self.registers[source.val]
def interpret(code):
return Frame(code).interpret()
def main(fname, argv):
f = open_file_as_stream(fname, "r")
input = f.readall()
f.close()
code = compile(input)
mainframe = Frame(code)
for i in range(len(argv)):
mainframe.registers[i] = Int(int(argv[i]))
res = mainframe.interpret()
print "Result:", res.repr()
if __name__ == '__main__':
import sys
if len(sys.argv) < 2:
print __doc__
sys.exit(1)
fname = sys.argv[1]
main(fname, sys.argv[2:])
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