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"""Tests for thread-local bytecode."""
import dis
import textwrap
import unittest
from test import support
from test.support import cpython_only, import_helper, requires_specialization_ft
from test.support.script_helper import assert_python_ok
from test.support.threading_helper import requires_working_threading
# Skip this test if the _testinternalcapi module isn't available
_testinternalcapi = import_helper.import_module("_testinternalcapi")
@cpython_only
@requires_working_threading()
@unittest.skipUnless(support.Py_GIL_DISABLED, "only in free-threaded builds")
class TLBCTests(unittest.TestCase):
@requires_specialization_ft
def test_new_threads_start_with_unspecialized_code(self):
code = textwrap.dedent("""
import dis
import queue
import threading
from _testinternalcapi import get_tlbc
def all_opnames(bc):
return {i.opname for i in dis._get_instructions_bytes(bc)}
def f(a, b, q=None):
if q is not None:
q.put(get_tlbc(f))
return a + b
for _ in range(100):
# specialize
f(1, 2)
q = queue.Queue()
t = threading.Thread(target=f, args=('a', 'b', q))
t.start()
t.join()
assert "BINARY_OP_ADD_INT" in all_opnames(get_tlbc(f))
assert "BINARY_OP_ADD_INT" not in all_opnames(q.get())
""")
assert_python_ok("-X", "tlbc=1", "-c", code)
@requires_specialization_ft
def test_threads_specialize_independently(self):
code = textwrap.dedent("""
import dis
import queue
import threading
from _testinternalcapi import get_tlbc
def all_opnames(bc):
return {i.opname for i in dis._get_instructions_bytes(bc)}
def f(a, b):
return a + b
def g(a, b, q=None):
for _ in range(100):
f(a, b)
if q is not None:
q.put(get_tlbc(f))
# specialize in main thread
g(1, 2)
# specialize in other thread
q = queue.Queue()
t = threading.Thread(target=g, args=('a', 'b', q))
t.start()
t.join()
assert "BINARY_OP_ADD_INT" in all_opnames(get_tlbc(f))
t_opnames = all_opnames(q.get())
assert "BINARY_OP_ADD_INT" not in t_opnames
assert "BINARY_OP_ADD_UNICODE" in t_opnames
""")
assert_python_ok("-X", "tlbc=1", "-c", code)
def test_reuse_tlbc_across_threads_different_lifetimes(self):
code = textwrap.dedent("""
import queue
import threading
from _testinternalcapi import get_tlbc_id
def f(a, b, q=None):
if q is not None:
q.put(get_tlbc_id(f))
return a + b
q = queue.Queue()
tlbc_ids = []
for _ in range(3):
t = threading.Thread(target=f, args=('a', 'b', q))
t.start()
t.join()
tlbc_ids.append(q.get())
assert tlbc_ids[0] == tlbc_ids[1]
assert tlbc_ids[1] == tlbc_ids[2]
""")
assert_python_ok("-X", "tlbc=1", "-c", code)
def test_no_copies_if_tlbc_disabled(self):
code = textwrap.dedent("""
import queue
import threading
from _testinternalcapi import get_tlbc_id
def f(a, b, q=None):
if q is not None:
q.put(get_tlbc_id(f))
return a + b
q = queue.Queue()
threads = []
for _ in range(3):
t = threading.Thread(target=f, args=('a', 'b', q))
t.start()
threads.append(t)
tlbc_ids = []
for t in threads:
t.join()
tlbc_ids.append(q.get())
main_tlbc_id = get_tlbc_id(f)
assert main_tlbc_id is not None
assert tlbc_ids[0] == main_tlbc_id
assert tlbc_ids[1] == main_tlbc_id
assert tlbc_ids[2] == main_tlbc_id
""")
assert_python_ok("-X", "tlbc=0", "-c", code)
def test_no_specialization_if_tlbc_disabled(self):
code = textwrap.dedent("""
import dis
import queue
import threading
from _testinternalcapi import get_tlbc
def all_opnames(f):
bc = get_tlbc(f)
return {i.opname for i in dis._get_instructions_bytes(bc)}
def f(a, b):
return a + b
for _ in range(100):
f(1, 2)
assert "BINARY_OP_ADD_INT" not in all_opnames(f)
""")
assert_python_ok("-X", "tlbc=0", "-c", code)
def test_generator_throw(self):
code = textwrap.dedent("""
import queue
import threading
from _testinternalcapi import get_tlbc_id
def g():
try:
yield
except:
yield get_tlbc_id(g)
def f(q):
gen = g()
next(gen)
q.put(gen.throw(ValueError))
q = queue.Queue()
t = threading.Thread(target=f, args=(q,))
t.start()
t.join()
gen = g()
next(gen)
main_id = gen.throw(ValueError)
assert main_id != q.get()
""")
assert_python_ok("-X", "tlbc=1", "-c", code)
if __name__ == "__main__":
unittest.main()
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