ext/pybind11/tests/test_exceptions.cpp - public/gem5 - Git at Google

 /*
     tests/test_custom-exceptions.cpp -- exception translation

     Copyright (c) 2016 Pim Schellart <P.Schellart@princeton.edu>

     All rights reserved. Use of this source code is governed by a
     BSD-style license that can be found in the LICENSE file.
 */
 #include "test_exceptions.h"

 #include "local_bindings.h"

 #include "pybind11_tests.h"
 #include <utility>

 // A type that should be raised as an exception in Python
 class MyException : public std::exception {
 public:
     explicit MyException(const char * m) : message{m} {}
     const char * what() const noexcept override {return message.c_str();}
 private:
     std::string message = "";
 };

 // A type that should be translated to a standard Python exception
 class MyException2 : public std::exception {
 public:
     explicit MyException2(const char * m) : message{m} {}
     const char * what() const noexcept override {return message.c_str();}
 private:
     std::string message = "";
 };

 // A type that is not derived from std::exception (and is thus unknown)
 class MyException3 {
 public:
     explicit MyException3(const char * m) : message{m} {}
     virtual const char * what() const noexcept {return message.c_str();}
     // Rule of 5 BEGIN: to preempt compiler warnings.
     MyException3(const MyException3&) = default;
     MyException3(MyException3&&) = default;
     MyException3& operator=(const MyException3&) = default;
     MyException3& operator=(MyException3&&) = default;
     virtual ~MyException3() = default;
     // Rule of 5 END.
 private:
     std::string message = "";
 };

 // A type that should be translated to MyException
 // and delegated to its exception translator
 class MyException4 : public std::exception {
 public:
     explicit MyException4(const char * m) : message{m} {}
     const char * what() const noexcept override {return message.c_str();}
 private:
     std::string message = "";
 };


 // Like the above, but declared via the helper function
 class MyException5 : public std::logic_error {
 public:
     explicit MyException5(const std::string &what) : std::logic_error(what) {}
 };

 // Inherits from MyException5
 class MyException5_1 : public MyException5 {
     using MyException5::MyException5;
 };


 // Exception that will be caught via the module local translator.
 class MyException6 : public std::exception {
 public:
     explicit MyException6(const char * m) : message{m} {}
     const char * what() const noexcept override {return message.c_str();}
 private:
     std::string message = "";
 };


 struct PythonCallInDestructor {
     explicit PythonCallInDestructor(const py::dict &d) : d(d) {}
     ~PythonCallInDestructor() { d["good"] = true; }

     py::dict d;
 };


 struct PythonAlreadySetInDestructor {
     explicit PythonAlreadySetInDestructor(const py::str &s) : s(s) {}
     ~PythonAlreadySetInDestructor() {
         py::dict foo;
         try {
             // Assign to a py::object to force read access of nonexistent dict entry
             py::object o = foo["bar"];
         }
         catch (py::error_already_set& ex) {
             ex.discard_as_unraisable(s);
         }
     }

     py::str s;
 };


 TEST_SUBMODULE(exceptions, m) {
     m.def("throw_std_exception", []() {
         throw std::runtime_error("This exception was intentionally thrown.");
     });

     // make a new custom exception and use it as a translation target
     static py::exception<MyException> ex(m, "MyException");
     py::register_exception_translator([](std::exception_ptr p) {
         try {
             if (p) std::rethrow_exception(p);
         } catch (const MyException &e) {
             // Set MyException as the active python error
             ex(e.what());
         }
     });

     // register new translator for MyException2
     // no need to store anything here because this type will
     // never by visible from Python
     py::register_exception_translator([](std::exception_ptr p) {
         try {
             if (p) std::rethrow_exception(p);
         } catch (const MyException2 &e) {
             // Translate this exception to a standard RuntimeError
             PyErr_SetString(PyExc_RuntimeError, e.what());
         }
     });

     // register new translator for MyException4
     // which will catch it and delegate to the previously registered
     // translator for MyException by throwing a new exception
     py::register_exception_translator([](std::exception_ptr p) {
         try {
             if (p) std::rethrow_exception(p);
         } catch (const MyException4 &e) {
             throw MyException(e.what());
         }
     });

     // A simple exception translation:
     auto ex5 = py::register_exception<MyException5>(m, "MyException5");
     // A slightly more complicated one that declares MyException5_1 as a subclass of MyException5
     py::register_exception<MyException5_1>(m, "MyException5_1", ex5.ptr());

     //py::register_local_exception<LocalSimpleException>(m, "LocalSimpleException")

     py::register_local_exception_translator([](std::exception_ptr p) {
       try {
           if (p) {
             std::rethrow_exception(p);
           }
       } catch (const MyException6 &e) {
         PyErr_SetString(PyExc_RuntimeError, e.what());
       }
     });

     m.def("throws1", []() { throw MyException("this error should go to a custom type"); });
     m.def("throws2", []() { throw MyException2("this error should go to a standard Python exception"); });
     m.def("throws3", []() { throw MyException3("this error cannot be translated"); });
     m.def("throws4", []() { throw MyException4("this error is rethrown"); });
     m.def("throws5", []() { throw MyException5("this is a helper-defined translated exception"); });
     m.def("throws5_1", []() { throw MyException5_1("MyException5 subclass"); });
     m.def("throws6", []() { throw MyException6("MyException6 only handled in this module"); });
     m.def("throws_logic_error", []() { throw std::logic_error("this error should fall through to the standard handler"); });
     m.def("throws_overflow_error", []() { throw std::overflow_error(""); });
     m.def("throws_local_error", []() { throw LocalException("never caught"); });
     m.def("throws_local_simple_error", []() { throw LocalSimpleException("this mod"); });
     m.def("exception_matches", []() {
         py::dict foo;
         try {
             // Assign to a py::object to force read access of nonexistent dict entry
             py::object o = foo["bar"];
         }
         catch (py::error_already_set& ex) {
             if (!ex.matches(PyExc_KeyError)) throw;
             return true;
         }
         return false;
     });
     m.def("exception_matches_base", []() {
         py::dict foo;
         try {
             // Assign to a py::object to force read access of nonexistent dict entry
             py::object o = foo["bar"];
         }
         catch (py::error_already_set &ex) {
             if (!ex.matches(PyExc_Exception)) throw;
             return true;
         }
         return false;
     });
     m.def("modulenotfound_exception_matches_base", []() {
         try {
             // On Python >= 3.6, this raises a ModuleNotFoundError, a subclass of ImportError
             py::module_::import("nonexistent");
         }
         catch (py::error_already_set &ex) {
             if (!ex.matches(PyExc_ImportError)) throw;
             return true;
         }
         return false;
     });

     m.def("throw_already_set", [](bool err) {
         if (err)
             PyErr_SetString(PyExc_ValueError, "foo");
         try {
             throw py::error_already_set();
         } catch (const std::runtime_error& e) {
             if ((err && e.what() != std::string("ValueError: foo")) ||
                 (!err && e.what() != std::string("Unknown internal error occurred")))
             {
                 PyErr_Clear();
                 throw std::runtime_error("error message mismatch");
             }
         }
         PyErr_Clear();
         if (err)
             PyErr_SetString(PyExc_ValueError, "foo");
         throw py::error_already_set();
     });

     m.def("python_call_in_destructor", [](const py::dict &d) {
         bool retval = false;
         try {
             PythonCallInDestructor set_dict_in_destructor(d);
             PyErr_SetString(PyExc_ValueError, "foo");
             throw py::error_already_set();
         } catch (const py::error_already_set&) {
             retval = true;
         }
         return retval;
     });

     m.def("python_alreadyset_in_destructor", [](const py::str &s) {
         PythonAlreadySetInDestructor alreadyset_in_destructor(s);
         return true;
     });

     // test_nested_throws
     m.def("try_catch",
           [m](const py::object &exc_type, const py::function &f, const py::args &args) {
               try {
                   f(*args);
               } catch (py::error_already_set &ex) {
                   if (ex.matches(exc_type))
                       py::print(ex.what());
                   else
                       throw;
               }
           });

     // Test repr that cannot be displayed
     m.def("simple_bool_passthrough", [](bool x) {return x;});

     m.def("throw_should_be_translated_to_key_error", []() { throw shared_exception(); });

 #if PY_VERSION_HEX >= 0x03030000

     m.def("raise_from", []() {
         PyErr_SetString(PyExc_ValueError, "inner");
         py::raise_from(PyExc_ValueError, "outer");
         throw py::error_already_set();
     });

     m.def("raise_from_already_set", []() {
         try {
             PyErr_SetString(PyExc_ValueError, "inner");
             throw py::error_already_set();
         } catch (py::error_already_set& e) {
             py::raise_from(e, PyExc_ValueError, "outer");
             throw py::error_already_set();
         }
     });

 #endif
 }
	/*
	tests/test_custom-exceptions.cpp -- exception translation

	Copyright (c) 2016 Pim Schellart <P.Schellart@princeton.edu>

	All rights reserved. Use of this source code is governed by a
	BSD-style license that can be found in the LICENSE file.
	*/
	#include "test_exceptions.h"

	#include "local_bindings.h"

	#include "pybind11_tests.h"
	#include <utility>

	// A type that should be raised as an exception in Python
	class MyException : public std::exception {
	public:
	explicit MyException(const char * m) : message{m} {}
	const char * what() const noexcept override {return message.c_str();}
	private:
	std::string message = "";
	};

	// A type that should be translated to a standard Python exception
	class MyException2 : public std::exception {
	public:
	explicit MyException2(const char * m) : message{m} {}
	const char * what() const noexcept override {return message.c_str();}
	private:
	std::string message = "";
	};

	// A type that is not derived from std::exception (and is thus unknown)
	class MyException3 {
	public:
	explicit MyException3(const char * m) : message{m} {}
	virtual const char * what() const noexcept {return message.c_str();}
	// Rule of 5 BEGIN: to preempt compiler warnings.
	MyException3(const MyException3&) = default;
	MyException3(MyException3&&) = default;
	MyException3& operator=(const MyException3&) = default;
	MyException3& operator=(MyException3&&) = default;
	virtual ~MyException3() = default;
	// Rule of 5 END.
	private:
	std::string message = "";
	};

	// A type that should be translated to MyException
	// and delegated to its exception translator
	class MyException4 : public std::exception {
	public:
	explicit MyException4(const char * m) : message{m} {}
	const char * what() const noexcept override {return message.c_str();}
	private:
	std::string message = "";
	};


	// Like the above, but declared via the helper function
	class MyException5 : public std::logic_error {
	public:
	explicit MyException5(const std::string &what) : std::logic_error(what) {}
	};

	// Inherits from MyException5
	class MyException5_1 : public MyException5 {
	using MyException5::MyException5;
	};


	// Exception that will be caught via the module local translator.
	class MyException6 : public std::exception {
	public:
	explicit MyException6(const char * m) : message{m} {}
	const char * what() const noexcept override {return message.c_str();}
	private:
	std::string message = "";
	};


	struct PythonCallInDestructor {
	explicit PythonCallInDestructor(const py::dict &d) : d(d) {}
	~PythonCallInDestructor() { d["good"] = true; }

	py::dict d;
	};



	struct PythonAlreadySetInDestructor {
	explicit PythonAlreadySetInDestructor(const py::str &s) : s(s) {}
	~PythonAlreadySetInDestructor() {
	py::dict foo;
	try {
	// Assign to a py::object to force read access of nonexistent dict entry
	py::object o = foo["bar"];
	}
	catch (py::error_already_set& ex) {
	ex.discard_as_unraisable(s);
	}
	}

	py::str s;
	};


	TEST_SUBMODULE(exceptions, m) {
	m.def("throw_std_exception", []() {
	throw std::runtime_error("This exception was intentionally thrown.");
	});

	// make a new custom exception and use it as a translation target
	static py::exception<MyException> ex(m, "MyException");
	py::register_exception_translator([](std::exception_ptr p) {
	try {
	if (p) std::rethrow_exception(p);
	} catch (const MyException &e) {
	// Set MyException as the active python error
	ex(e.what());
	}
	});

	// register new translator for MyException2
	// no need to store anything here because this type will
	// never by visible from Python
	py::register_exception_translator([](std::exception_ptr p) {
	try {
	if (p) std::rethrow_exception(p);
	} catch (const MyException2 &e) {
	// Translate this exception to a standard RuntimeError
	PyErr_SetString(PyExc_RuntimeError, e.what());
	}
	});

	// register new translator for MyException4
	// which will catch it and delegate to the previously registered
	// translator for MyException by throwing a new exception
	py::register_exception_translator([](std::exception_ptr p) {
	try {
	if (p) std::rethrow_exception(p);
	} catch (const MyException4 &e) {
	throw MyException(e.what());
	}
	});

	// A simple exception translation:
	auto ex5 = py::register_exception<MyException5>(m, "MyException5");
	// A slightly more complicated one that declares MyException5_1 as a subclass of MyException5
	py::register_exception<MyException5_1>(m, "MyException5_1", ex5.ptr());

	//py::register_local_exception<LocalSimpleException>(m, "LocalSimpleException")

	py::register_local_exception_translator([](std::exception_ptr p) {
	try {
	if (p) {
	std::rethrow_exception(p);
	}
	} catch (const MyException6 &e) {
	PyErr_SetString(PyExc_RuntimeError, e.what());
	}
	});

	m.def("throws1", []() { throw MyException("this error should go to a custom type"); });
	m.def("throws2", []() { throw MyException2("this error should go to a standard Python exception"); });
	m.def("throws3", []() { throw MyException3("this error cannot be translated"); });
	m.def("throws4", []() { throw MyException4("this error is rethrown"); });
	m.def("throws5", []() { throw MyException5("this is a helper-defined translated exception"); });
	m.def("throws5_1", []() { throw MyException5_1("MyException5 subclass"); });
	m.def("throws6", []() { throw MyException6("MyException6 only handled in this module"); });
	m.def("throws_logic_error", []() { throw std::logic_error("this error should fall through to the standard handler"); });
	m.def("throws_overflow_error", []() { throw std::overflow_error(""); });
	m.def("throws_local_error", []() { throw LocalException("never caught"); });
	m.def("throws_local_simple_error", []() { throw LocalSimpleException("this mod"); });
	m.def("exception_matches", []() {
	py::dict foo;
	try {
	// Assign to a py::object to force read access of nonexistent dict entry
	py::object o = foo["bar"];
	}
	catch (py::error_already_set& ex) {
	if (!ex.matches(PyExc_KeyError)) throw;
	return true;
	}
	return false;
	});
	m.def("exception_matches_base", []() {
	py::dict foo;
	try {
	// Assign to a py::object to force read access of nonexistent dict entry
	py::object o = foo["bar"];
	}
	catch (py::error_already_set &ex) {
	if (!ex.matches(PyExc_Exception)) throw;
	return true;
	}
	return false;
	});
	m.def("modulenotfound_exception_matches_base", []() {
	try {
	// On Python >= 3.6, this raises a ModuleNotFoundError, a subclass of ImportError
	py::module_::import("nonexistent");
	}
	catch (py::error_already_set &ex) {
	if (!ex.matches(PyExc_ImportError)) throw;
	return true;
	}
	return false;
	});

	m.def("throw_already_set", [](bool err) {
	if (err)
	PyErr_SetString(PyExc_ValueError, "foo");
	try {
	throw py::error_already_set();
	} catch (const std::runtime_error& e) {
	if ((err && e.what() != std::string("ValueError: foo")) \|\|
	(!err && e.what() != std::string("Unknown internal error occurred")))
	{
	PyErr_Clear();
	throw std::runtime_error("error message mismatch");
	}
	}
	PyErr_Clear();
	if (err)
	PyErr_SetString(PyExc_ValueError, "foo");
	throw py::error_already_set();
	});

	m.def("python_call_in_destructor", [](const py::dict &d) {
	bool retval = false;
	try {
	PythonCallInDestructor set_dict_in_destructor(d);
	PyErr_SetString(PyExc_ValueError, "foo");
	throw py::error_already_set();
	} catch (const py::error_already_set&) {
	retval = true;
	}
	return retval;
	});

	m.def("python_alreadyset_in_destructor", [](const py::str &s) {
	PythonAlreadySetInDestructor alreadyset_in_destructor(s);
	return true;
	});

	// test_nested_throws
	m.def("try_catch",
	[m](const py::object &exc_type, const py::function &f, const py::args &args) {
	try {
	f(*args);
	} catch (py::error_already_set &ex) {
	if (ex.matches(exc_type))
	py::print(ex.what());
	else
	throw;
	}
	});

	// Test repr that cannot be displayed
	m.def("simple_bool_passthrough", [](bool x) {return x;});

	m.def("throw_should_be_translated_to_key_error", []() { throw shared_exception(); });

	#if PY_VERSION_HEX >= 0x03030000

	m.def("raise_from", []() {
	PyErr_SetString(PyExc_ValueError, "inner");
	py::raise_from(PyExc_ValueError, "outer");
	throw py::error_already_set();
	});

	m.def("raise_from_already_set", []() {
	try {
	PyErr_SetString(PyExc_ValueError, "inner");
	throw py::error_already_set();
	} catch (py::error_already_set& e) {
	py::raise_from(e, PyExc_ValueError, "outer");
	throw py::error_already_set();
	}
	});

	#endif
	}