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#!/usr/bin/env python3
import sys
import unittest
from copy import copy
from bytecode import (
Bytecode,
CompilerFlags,
ConcreteBytecode,
ConcreteInstr,
ControlFlowGraph,
)
from bytecode.flags import infer_flags
from bytecode.instr import UNSET, FreeVar, Instr
from bytecode.utils import PY311, PY312
def trivial():
pass
def _fact(a):
def inner():
return a
return inner
hasfree = _fact(1)
def gen():
yield 1
async def trivial_async():
pass
async def async_await(a):
await a
async def async_with_comprehension():
return [await i for i in range(10)]
async def async_generator():
yield 1
FLAG_INFERENCE_TEST_CASES = [
trivial,
hasfree,
gen,
trivial_async,
async_await,
async_with_comprehension,
async_generator,
]
class FlagsTests(unittest.TestCase):
def test_type_validation_on_inference(self):
with self.assertRaises(ValueError):
infer_flags(1)
def test_flag_inference(self):
# Check no loss of non-infered flags
code = ControlFlowGraph()
code.flags |= (
CompilerFlags.NEWLOCALS
| CompilerFlags.VARARGS
| CompilerFlags.VARKEYWORDS
| CompilerFlags.NESTED
| CompilerFlags.FUTURE_GENERATOR_STOP
)
code.update_flags()
for f in (
CompilerFlags.NEWLOCALS,
CompilerFlags.VARARGS,
CompilerFlags.VARKEYWORDS,
CompilerFlags.NESTED,
CompilerFlags.NOFREE,
CompilerFlags.OPTIMIZED,
CompilerFlags.FUTURE_GENERATOR_STOP,
):
self.assertTrue(bool(code.flags & f))
# Infer optimized and nofree
code = Bytecode()
flags = infer_flags(code)
self.assertTrue(bool(flags & CompilerFlags.OPTIMIZED))
self.assertTrue(bool(flags & CompilerFlags.NOFREE))
code.append(Instr("STORE_NAME", "a"))
flags = infer_flags(code)
self.assertFalse(bool(flags & CompilerFlags.OPTIMIZED))
self.assertTrue(bool(flags & CompilerFlags.NOFREE))
code.append(Instr("STORE_DEREF", FreeVar("b")))
code.update_flags()
self.assertFalse(bool(code.flags & CompilerFlags.OPTIMIZED))
self.assertFalse(bool(code.flags & CompilerFlags.NOFREE))
def test_function_rountrip(self):
for f in FLAG_INFERENCE_TEST_CASES:
for cls in (Bytecode, ConcreteBytecode):
with self.subTest(f"Testing {f.__name__} with {cls}"):
b = cls.from_code(f.__code__)
existing = copy(b.flags)
b.update_flags()
# NOTE: as far as I can tell NOFREE is not used by CPython anymore
# it shows up nowhere in the interpreter logic and only exist in
# dis and inspect...
self.assertEqual(
existing & ~CompilerFlags.NOFREE,
b.flags & ~CompilerFlags.NOFREE,
)
def test_async_gen_no_flag_is_async_None(self):
# Test inference in the absence of any flag set on the bytecode
# Infer generator
code = ConcreteBytecode()
code.append(
ConcreteInstr("YIELD_VALUE", 0) if PY312 else ConcreteInstr("YIELD_VALUE")
)
if PY311:
code.append(ConcreteInstr("RESUME", 1))
code.update_flags()
self.assertTrue(bool(code.flags & CompilerFlags.GENERATOR))
# Infer coroutine
code = ConcreteBytecode()
code.append(
ConcreteInstr("GET_AWAITABLE", 0 if sys.version_info >= (3, 11) else UNSET)
)
code.update_flags()
self.assertTrue(bool(code.flags & CompilerFlags.COROUTINE))
# Infer coroutine or async generator
for i, r, expected in (
("YIELD_VALUE", 1, CompilerFlags.ASYNC_GENERATOR),
("YIELD_VALUE", 2, CompilerFlags.ASYNC_GENERATOR),
# YIELD_VALUE is used for normal await flow in Py 3.11+ when followed
# by a RESUME whose lowest two bits are set to 3
*((("YIELD_VALUE", 3, CompilerFlags.COROUTINE),) if PY311 else ()),
("YIELD_FROM", 0, CompilerFlags.COROUTINE),
):
with self.subTest(i):
if PY311 and i == "YIELD_FROM":
self.skipTest("YIELD_FROM does not exist on 3.11")
code = ConcreteBytecode()
code.append(ConcreteInstr("GET_AWAITABLE", 0 if PY311 else UNSET))
code.append(ConcreteInstr(i, 0) if PY312 else ConcreteInstr(i))
if PY311:
code.append(ConcreteInstr("RESUME", r))
code.update_flags()
self.assertTrue(bool(code.flags & expected))
def test_async_gen_no_flag_is_async_True(self):
# Test inference when we request an async function
# Force coroutine
code = ConcreteBytecode()
code.update_flags(is_async=True)
self.assertTrue(bool(code.flags & CompilerFlags.COROUTINE))
# Infer coroutine or async generator
for i, r, expected in (
("YIELD_VALUE", 1, CompilerFlags.ASYNC_GENERATOR),
("YIELD_VALUE", 2, CompilerFlags.ASYNC_GENERATOR),
# YIELD_VALUE is used for normal await flow in Py 3.11+ when followed
# by a RESUME whose lowest two bits are set to 3
*((("YIELD_VALUE", 3, CompilerFlags.COROUTINE),) if PY311 else ()),
("YIELD_FROM", 0, CompilerFlags.COROUTINE),
):
with self.subTest(i):
if PY311 and i == "YIELD_FROM":
self.skipTest("YIELD_FROM does not exist on 3.11")
code = ConcreteBytecode()
code.append(ConcreteInstr(i, 0) if PY312 else ConcreteInstr(i))
if PY311:
code.append(ConcreteInstr("RESUME", r))
code.update_flags(is_async=True)
self.assertEqual(code.flags & expected, expected)
def test_async_gen_no_flag_is_async_False(self):
# Test inference when we request a non-async function
# Infer generator
code = ConcreteBytecode()
code.append(
ConcreteInstr("YIELD_VALUE", 0) if PY312 else ConcreteInstr("YIELD_VALUE")
)
if PY311:
code.append(ConcreteInstr("RESUME", 1))
code.flags = CompilerFlags(CompilerFlags.COROUTINE)
code.update_flags(is_async=False)
self.assertTrue(bool(code.flags & CompilerFlags.GENERATOR))
# Abort on coroutine
code = ConcreteBytecode()
code.append(
ConcreteInstr("GET_AWAITABLE", 0 if sys.version_info >= (3, 11) else UNSET)
)
code.flags = CompilerFlags(CompilerFlags.COROUTINE)
with self.assertRaises(ValueError):
code.update_flags(is_async=False)
def test_async_gen_flags(self):
# Test inference in the presence of pre-existing flags
for is_async in (None, True):
# Infer generator
code = ConcreteBytecode()
code.append(
ConcreteInstr("YIELD_VALUE", 0)
if PY312
else ConcreteInstr("YIELD_VALUE")
)
if PY311:
code.append(ConcreteInstr("RESUME", 1))
for f, expected in (
(CompilerFlags.COROUTINE, CompilerFlags.ASYNC_GENERATOR),
(CompilerFlags.ASYNC_GENERATOR, CompilerFlags.ASYNC_GENERATOR),
(CompilerFlags.ITERABLE_COROUTINE, CompilerFlags.ITERABLE_COROUTINE),
):
code.flags = CompilerFlags(f)
code.update_flags(is_async=is_async)
self.assertTrue(bool(code.flags & expected))
# Infer coroutine
if not PY311:
code = ConcreteBytecode()
code.append(ConcreteInstr("YIELD_FROM"))
for f, expected in (
(CompilerFlags.COROUTINE, CompilerFlags.COROUTINE),
(CompilerFlags.ASYNC_GENERATOR, CompilerFlags.COROUTINE),
(
CompilerFlags.ITERABLE_COROUTINE,
CompilerFlags.ITERABLE_COROUTINE,
),
):
code.flags = CompilerFlags(f)
code.update_flags(is_async=is_async)
self.assertTrue(bool(code.flags & expected))
# Crash on ITERABLE_COROUTINE with async bytecode
code = ConcreteBytecode()
code.append(ConcreteInstr("GET_AWAITABLE", 0 if PY311 else UNSET))
code.flags = CompilerFlags(CompilerFlags.ITERABLE_COROUTINE)
with self.assertRaises(ValueError):
code.update_flags(is_async=is_async)
if __name__ == "__main__":
unittest.main() # pragma: no cover
|
