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d598172993
The builtin exception handler currently doesn't work across modules
under clang/libc++ for builtin pybind exceptions like
`pybind11::error_already_set` or `pybind11::stop_iteration`: under
RTLD_LOCAL module loading clang considers each module's exception
classes distinct types. This then means that the base exception
translator fails to catch the exceptions and the fall through to the
generic `std::exception` handler, which completely breaks things like
`stop_iteration`: only the `stop_iteration` of the first module loaded
actually works properly; later modules raise a RuntimeError with no
message when trying to invoke their iterators.
For example, two modules defined like this exhibit the behaviour under
clang++/libc++:
z1.cpp:
#include <pybind11/pybind11.h>
#include <pybind11/stl_bind.h>
namespace py = pybind11;
PYBIND11_MODULE(z1, m) {
py::bind_vector<std::vector<long>>(m, "IntVector");
}
z2.cpp:
#include <pybind11/pybind11.h>
#include <pybind11/stl_bind.h>
namespace py = pybind11;
PYBIND11_MODULE(z2, m) {
py::bind_vector<std::vector<double>>(m, "FloatVector");
}
Python:
import z1, z2
for i in z2.FloatVector():
pass
results in:
Traceback (most recent call last):
File "zs.py", line 2, in <module>
for i in z2.FloatVector():
RuntimeError
This commit fixes the issue by adding a new exception translator each
time the internals pointer is initialized from python builtins: this
generally means the internals data was initialized by some other
module. (The extra translator(s) are skipped under libstdc++).
145 lines
4.6 KiB
Python
145 lines
4.6 KiB
Python
import pytest
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from pybind11_tests import exceptions as m
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import pybind11_cross_module_tests as cm
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def test_std_exception(msg):
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with pytest.raises(RuntimeError) as excinfo:
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m.throw_std_exception()
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assert msg(excinfo.value) == "This exception was intentionally thrown."
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def test_error_already_set(msg):
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with pytest.raises(RuntimeError) as excinfo:
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m.throw_already_set(False)
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assert msg(excinfo.value) == "Unknown internal error occurred"
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with pytest.raises(ValueError) as excinfo:
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m.throw_already_set(True)
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assert msg(excinfo.value) == "foo"
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def test_cross_module_exceptions():
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with pytest.raises(RuntimeError) as excinfo:
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cm.raise_runtime_error()
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assert str(excinfo.value) == "My runtime error"
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with pytest.raises(ValueError) as excinfo:
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cm.raise_value_error()
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assert str(excinfo.value) == "My value error"
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with pytest.raises(ValueError) as excinfo:
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cm.throw_pybind_value_error()
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assert str(excinfo.value) == "pybind11 value error"
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with pytest.raises(TypeError) as excinfo:
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cm.throw_pybind_type_error()
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assert str(excinfo.value) == "pybind11 type error"
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with pytest.raises(StopIteration) as excinfo:
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cm.throw_stop_iteration()
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def test_python_call_in_catch():
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d = {}
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assert m.python_call_in_destructor(d) is True
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assert d["good"] is True
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def test_exception_matches():
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m.exception_matches()
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def test_custom(msg):
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# Can we catch a MyException?
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with pytest.raises(m.MyException) as excinfo:
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m.throws1()
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assert msg(excinfo.value) == "this error should go to a custom type"
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# Can we translate to standard Python exceptions?
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with pytest.raises(RuntimeError) as excinfo:
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m.throws2()
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assert msg(excinfo.value) == "this error should go to a standard Python exception"
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# Can we handle unknown exceptions?
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with pytest.raises(RuntimeError) as excinfo:
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m.throws3()
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assert msg(excinfo.value) == "Caught an unknown exception!"
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# Can we delegate to another handler by rethrowing?
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with pytest.raises(m.MyException) as excinfo:
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m.throws4()
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assert msg(excinfo.value) == "this error is rethrown"
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# Can we fall-through to the default handler?
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with pytest.raises(RuntimeError) as excinfo:
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m.throws_logic_error()
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assert msg(excinfo.value) == "this error should fall through to the standard handler"
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# Can we handle a helper-declared exception?
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with pytest.raises(m.MyException5) as excinfo:
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m.throws5()
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assert msg(excinfo.value) == "this is a helper-defined translated exception"
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# Exception subclassing:
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with pytest.raises(m.MyException5) as excinfo:
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m.throws5_1()
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assert msg(excinfo.value) == "MyException5 subclass"
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assert isinstance(excinfo.value, m.MyException5_1)
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with pytest.raises(m.MyException5_1) as excinfo:
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m.throws5_1()
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assert msg(excinfo.value) == "MyException5 subclass"
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with pytest.raises(m.MyException5) as excinfo:
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try:
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m.throws5()
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except m.MyException5_1:
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raise RuntimeError("Exception error: caught child from parent")
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assert msg(excinfo.value) == "this is a helper-defined translated exception"
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def test_nested_throws(capture):
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"""Tests nested (e.g. C++ -> Python -> C++) exception handling"""
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def throw_myex():
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raise m.MyException("nested error")
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def throw_myex5():
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raise m.MyException5("nested error 5")
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# In the comments below, the exception is caught in the first step, thrown in the last step
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# C++ -> Python
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with capture:
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m.try_catch(m.MyException5, throw_myex5)
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assert str(capture).startswith("MyException5: nested error 5")
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# Python -> C++ -> Python
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with pytest.raises(m.MyException) as excinfo:
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m.try_catch(m.MyException5, throw_myex)
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assert str(excinfo.value) == "nested error"
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def pycatch(exctype, f, *args):
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try:
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f(*args)
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except m.MyException as e:
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print(e)
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# C++ -> Python -> C++ -> Python
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with capture:
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m.try_catch(
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m.MyException5, pycatch, m.MyException, m.try_catch, m.MyException, throw_myex5)
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assert str(capture).startswith("MyException5: nested error 5")
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# C++ -> Python -> C++
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with capture:
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m.try_catch(m.MyException, pycatch, m.MyException5, m.throws4)
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assert capture == "this error is rethrown"
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# Python -> C++ -> Python -> C++
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with pytest.raises(m.MyException5) as excinfo:
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m.try_catch(m.MyException, pycatch, m.MyException, m.throws5)
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assert str(excinfo.value) == "this is a helper-defined translated exception"
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