forked from OSchip/llvm-project
147 lines
4.3 KiB
C++
147 lines
4.3 KiB
C++
//===--------------------- catch_pointer_nullptr.cpp ----------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: no-exceptions
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#include <cassert>
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#include <cstdlib>
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#include <iostream>
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// Roll our own assertion macro to get better error messages out of the tests.
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// In particular on systems that don't use __PRETTY_FUNCTION__ in assertions.
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#define my_assert(pred, msg) do_assert(pred, msg, __LINE__, __PRETTY_FUNCTION__)
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void do_assert(bool assert_passed, const char* msg, int line, const char* func) {
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if (assert_passed) return;
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std::cerr << __FILE__ << ":" << line << " " << func
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<< ": Assertion Failed `" << msg << "'\n\n";
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std::abort();
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}
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struct A {};
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struct Base {};
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struct Derived : public Base {};
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template <class To>
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bool test_conversion(To) { return true; }
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template <class To>
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bool test_conversion(...) { return false; }
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template <class Pointer>
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struct CreatePointer {
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Pointer operator()() const {
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return (Pointer)0;
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}
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};
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template <class Tp>
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struct CreatePointer<Tp*> {
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Tp* operator()() const {
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return (Tp*)42;
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}
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};
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template <class Throw, class Catch>
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void catch_pointer_test() {
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Throw throw_ptr = CreatePointer<Throw>()();
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// Use the compiler to determine if the exception of type Throw can be
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// implicitly converted to type Catch.
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const bool can_convert = test_conversion<Catch>(throw_ptr);
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try {
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throw throw_ptr;
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assert(false);
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} catch (Catch catch_ptr) {
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Catch catch2 = CreatePointer<Catch>()();
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my_assert(can_convert, "non-convertible type incorrectly caught");
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my_assert(catch_ptr == catch2,
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"Thrown pointer does not match caught ptr");
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} catch (...) {
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my_assert(!can_convert, "convertible type incorrectly not caught");
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}
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}
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// Generate CV qualified pointer typedefs.
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template <class Tp, bool First = false>
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struct TestTypes {
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typedef Tp* Type;
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typedef Tp const* CType;
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typedef Tp volatile* VType;
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typedef Tp const volatile* CVType;
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};
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// Special case for cv-qualifying a pointer-to-member without adding an extra
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// pointer to it.
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template <class Member, class Class>
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struct TestTypes<Member Class::*, true> {
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typedef Member (Class::*Type);
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typedef const Member (Class::*CType);
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typedef volatile Member (Class::*VType);
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typedef const volatile Member (Class::*CVType);
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};
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template <class Throw, class Catch, int level, bool first = false>
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struct generate_tests_imp {
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typedef TestTypes<Throw, first> ThrowTypes;
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typedef TestTypes<Catch, first> CatchTypes;
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void operator()() {
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typedef typename ThrowTypes::Type Type;
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typedef typename ThrowTypes::CType CType;
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typedef typename ThrowTypes::VType VType;
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typedef typename ThrowTypes::CVType CVType;
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run_catch_tests<Type>();
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run_catch_tests<CType>();
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run_catch_tests<VType>();
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run_catch_tests<CVType>();
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}
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template <class ThrowTp>
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void run_catch_tests() {
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typedef typename CatchTypes::Type Type;
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typedef typename CatchTypes::CType CType;
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typedef typename CatchTypes::VType VType;
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typedef typename CatchTypes::CVType CVType;
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catch_pointer_test<ThrowTp, Type>();
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catch_pointer_test<ThrowTp, CType>();
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catch_pointer_test<ThrowTp, VType>();
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catch_pointer_test<ThrowTp, CVType>();
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generate_tests_imp<ThrowTp, Type, level-1>()();
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generate_tests_imp<ThrowTp, CType, level-1>()();
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generate_tests_imp<ThrowTp, VType, level-1>()();
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generate_tests_imp<ThrowTp, CVType, level-1>()();
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}
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};
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template <class Throw, class Catch, bool first>
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struct generate_tests_imp<Throw, Catch, 0, first> {
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void operator()() {
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catch_pointer_test<Throw, Catch>();
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}
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};
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template <class Throw, class Catch, int level>
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struct generate_tests : generate_tests_imp<Throw, Catch, level, true> {};
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int main(int, char**)
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{
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generate_tests<int, int, 3>()();
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generate_tests<Base, Derived, 2>()();
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generate_tests<Derived, Base, 2>()();
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generate_tests<int, void, 2>()();
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generate_tests<void, int, 2>()();
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generate_tests<int A::*, int A::*, 3>()();
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generate_tests<int A::*, void, 2>()();
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generate_tests<void, int A::*, 2>()();
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return 0;
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}
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