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catch_pointer_reference.pass.cpp
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This test case checks specifically the cases under bullet 3.1 & 3.2:
//
// C++ ABI 15.3:
// A handler is a match for an exception object of type E if
// * The handler is of type cv T or cv T& and E and T are the same type
// (ignoring the top-level cv-qualifiers), or
// * the handler is of type cv T or cv T& and T is an unambiguous base
// class of E, or
// > * the handler is of type cv1 T* cv2 and E is a pointer type that can <
// > be converted to the type of the handler by either or both of <
// > o a standard pointer conversion (4.10 [conv.ptr]) not involving <
// > conversions to private or protected or ambiguous classes <
// > o a qualification conversion <
// * the handler is a pointer or pointer to member type and E is
// std::nullptr_t
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: no-exceptions
#include <exception>
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
struct Base {};
struct Derived : Base {};
struct Derived2 : Base {};
struct Ambiguous : Derived, Derived2 {};
struct Private : private Base {};
struct Protected : protected Base {};
template <typename T // Handler type
,typename E // Thrown exception type
,typename O // Object type
>
void assert_catches()
{
try
{
O o;
throw static_cast<E>(&o);
printf("%s\n", __PRETTY_FUNCTION__);
assert(false && "Statements after throw must be unreachable");
}
catch (T t)
{
assert(true);
return;
}
catch (...)
{
printf("%s\n", __PRETTY_FUNCTION__);
assert(false && "Should not have entered catch-all");
}
printf("%s\n", __PRETTY_FUNCTION__);
assert(false && "The catch should have returned");
}
template <typename T // Handler type
,typename E // Thrown exception type
,typename O // Object type
>
void assert_cannot_catch()
{
try
{
O o;
throw static_cast<E>(&o);
printf("%s\n", __PRETTY_FUNCTION__);
assert(false && "Statements after throw must be unreachable");
}
catch (T t)
{
printf("%s\n", __PRETTY_FUNCTION__);
assert(false && "Should not have entered the catch");
}
catch (...)
{
assert(true);
return;
}
printf("%s\n", __PRETTY_FUNCTION__);
assert(false && "The catch-all should have returned");
}
void f1()
{
// Test that every combination of handler of type:
// cv1 Base * cv2
// catches an exception of type:
// Derived *
assert_catches< Base * , Derived *, Derived>();
assert_catches<const Base * , Derived *, Derived>();
assert_catches< volatile Base * , Derived *, Derived>();
assert_catches<const volatile Base * , Derived *, Derived>();
assert_catches< Base * const , Derived *, Derived>();
assert_catches<const Base * const , Derived *, Derived>();
assert_catches< volatile Base * const , Derived *, Derived>();
assert_catches<const volatile Base * const , Derived *, Derived>();
assert_catches< Base * volatile, Derived *, Derived>();
assert_catches<const Base * volatile, Derived *, Derived>();
assert_catches< volatile Base * volatile, Derived *, Derived>();
assert_catches<const volatile Base * volatile, Derived *, Derived>();
assert_catches< Base * const volatile, Derived *, Derived>();
assert_catches<const Base * const volatile, Derived *, Derived>();
assert_catches< volatile Base * const volatile, Derived *, Derived>();
assert_catches<const volatile Base * const volatile, Derived *, Derived>();
}
void f2()
{
// Test that every combination of handler of type:
// cv1 Base * cv2
// catches an exception of type:
// Base *
assert_catches< Base * , Base *, Derived>();
assert_catches<const Base * , Base *, Derived>();
assert_catches< volatile Base * , Base *, Derived>();
assert_catches<const volatile Base * , Base *, Derived>();
assert_catches< Base * const , Base *, Derived>();
assert_catches<const Base * const , Base *, Derived>();
assert_catches< volatile Base * const , Base *, Derived>();
assert_catches<const volatile Base * const , Base *, Derived>();
assert_catches< Base * volatile, Base *, Derived>();
assert_catches<const Base * volatile, Base *, Derived>();
assert_catches< volatile Base * volatile, Base *, Derived>();
assert_catches<const volatile Base * volatile, Base *, Derived>();
assert_catches< Base * const volatile, Base *, Derived>();
assert_catches<const Base * const volatile, Base *, Derived>();
assert_catches< volatile Base * const volatile, Base *, Derived>();
assert_catches<const volatile Base * const volatile, Base *, Derived>();
}
void f3()
{
// Test that every combination of handler of type:
// cv1 Derived * cv2
// catches an exception of type:
// Derived *
assert_catches< Derived * , Derived *, Derived>();
assert_catches<const Derived * , Derived *, Derived>();
assert_catches< volatile Derived * , Derived *, Derived>();
assert_catches<const volatile Derived * , Derived *, Derived>();
assert_catches< Derived * const , Derived *, Derived>();
assert_catches<const Derived * const , Derived *, Derived>();
assert_catches< volatile Derived * const , Derived *, Derived>();
assert_catches<const volatile Derived * const , Derived *, Derived>();
assert_catches< Derived * volatile, Derived *, Derived>();
assert_catches<const Derived * volatile, Derived *, Derived>();
assert_catches< volatile Derived * volatile, Derived *, Derived>();
assert_catches<const volatile Derived * volatile, Derived *, Derived>();
assert_catches< Derived * const volatile, Derived *, Derived>();
assert_catches<const Derived * const volatile, Derived *, Derived>();
assert_catches< volatile Derived * const volatile, Derived *, Derived>();
assert_catches<const volatile Derived * const volatile, Derived *, Derived>();
}
void f4()
{
// Test that every combination of handler of type:
// cv1 Derived * cv2
// cannot catch an exception of type:
// Base *
assert_cannot_catch< Derived * , Base *, Derived>();
assert_cannot_catch<const Derived * , Base *, Derived>();
assert_cannot_catch< volatile Derived * , Base *, Derived>();
assert_cannot_catch<const volatile Derived * , Base *, Derived>();
assert_cannot_catch< Derived * const , Base *, Derived>();
assert_cannot_catch<const Derived * const , Base *, Derived>();
assert_cannot_catch< volatile Derived * const , Base *, Derived>();
assert_cannot_catch<const volatile Derived * const , Base *, Derived>();
assert_cannot_catch< Derived * volatile, Base *, Derived>();
assert_cannot_catch<const Derived * volatile, Base *, Derived>();
assert_cannot_catch< volatile Derived * volatile, Base *, Derived>();
assert_cannot_catch<const volatile Derived * volatile, Base *, Derived>();
assert_cannot_catch< Derived * const volatile, Base *, Derived>();
assert_cannot_catch<const Derived * const volatile, Base *, Derived>();
assert_cannot_catch< volatile Derived * const volatile, Base *, Derived>();
assert_cannot_catch<const volatile Derived * const volatile, Base *, Derived>();
}
void f5()
{
// Test that every combination of handler of type:
// cv1 Derived * cv2 &
// catches an exception of type:
// Derived *
assert_catches< Derived * &, Derived *, Derived>();
assert_catches<const Derived * &, Derived *, Derived>();
assert_catches< volatile Derived * &, Derived *, Derived>();
assert_catches<const volatile Derived * &, Derived *, Derived>();
assert_catches< Derived * const &, Derived *, Derived>();
assert_catches<const Derived * const &, Derived *, Derived>();
assert_catches< volatile Derived * const &, Derived *, Derived>();
assert_catches<const volatile Derived * const &, Derived *, Derived>();
assert_catches< Derived * volatile &, Derived *, Derived>();
assert_catches<const Derived * volatile &, Derived *, Derived>();
assert_catches< volatile Derived * volatile &, Derived *, Derived>();
assert_catches<const volatile Derived * volatile &, Derived *, Derived>();
assert_catches< Derived * const volatile &, Derived *, Derived>();
assert_catches<const Derived * const volatile &, Derived *, Derived>();
assert_catches< volatile Derived * const volatile &, Derived *, Derived>();
assert_catches<const volatile Derived * const volatile &, Derived *, Derived>();
}
void f6()
{
// Test that every combination of handler of type:
// cv1 Base * cv2 &
// catches an exception of type:
// Base *
assert_catches< Base * &, Base *, Derived>();
assert_catches<const Base * &, Base *, Derived>();
assert_catches< volatile Base * &, Base *, Derived>();
assert_catches<const volatile Base * &, Base *, Derived>();
assert_catches< Base * const &, Base *, Derived>();
assert_catches<const Base * const &, Base *, Derived>();
assert_catches< volatile Base * const &, Base *, Derived>();
assert_catches<const volatile Base * const &, Base *, Derived>();
assert_catches< Base * volatile &, Base *, Derived>();
assert_catches<const Base * volatile &, Base *, Derived>();
assert_catches< volatile Base * volatile &, Base *, Derived>();
assert_catches<const volatile Base * volatile &, Base *, Derived>();
assert_catches< Base * const volatile &, Base *, Derived>();
assert_catches<const Base * const volatile &, Base *, Derived>();
assert_catches< volatile Base * const volatile &, Base *, Derived>();
assert_catches<const volatile Base * const volatile &, Base *, Derived>();
}
void f7()
{
// Test that every combination of handler of type:
// cv1 Derived * cv2 &
// cannot catch an exception of type:
// Base *
assert_cannot_catch< Derived * &, Base *, Derived>();
assert_cannot_catch<const Derived * &, Base *, Derived>();
assert_cannot_catch< volatile Derived * &, Base *, Derived>();
assert_cannot_catch<const volatile Derived * &, Base *, Derived>();
assert_cannot_catch< Derived * const &, Base *, Derived>();
assert_cannot_catch<const Derived * const &, Base *, Derived>();
assert_cannot_catch< volatile Derived * const &, Base *, Derived>();
assert_cannot_catch<const volatile Derived * const &, Base *, Derived>();
assert_cannot_catch< Derived * volatile &, Base *, Derived>();
assert_cannot_catch<const Derived * volatile &, Base *, Derived>();
assert_cannot_catch< volatile Derived * volatile &, Base *, Derived>();
assert_cannot_catch<const volatile Derived * volatile &, Base *, Derived>();
assert_cannot_catch< Derived * const volatile &, Base *, Derived>();
assert_cannot_catch<const Derived * const volatile &, Base *, Derived>();
assert_cannot_catch< volatile Derived * const volatile &, Base *, Derived>();
assert_cannot_catch<const volatile Derived * const volatile &, Base *, Derived>();
}
void f8()
{
// This test case has a caveat noted in the discussion here:
// https://gcc.gnu.org/ml/gcc-patches/2009-08/msg00264.html
// Specifically:
// This [test exposes a] corner case of the ARM C++ ABI. The generic C++
// ABI also gets this wrong, because I failed to notice the subtlety here.
// The issue is that 15.3/3 3rd bullet says:
// The handler is of type cv1 T* cv2 and E is a pointer type that
// can be converted to the type of the handler by either or both of:
// * a standard pointer conversion (4.10) not involving conversions
// to pointers to private or protected or ambiguous classes
// Notice that the handlers of type "cv1 T*cv2&" are not allowed such
// freedom to find a base class. The ABI error is that we treat handlers
// of reference type exactly the same as the corresponding hander of
// non-reference type. Elsewhere in the exception handling this makes no
// difference (for instance bullet 1 explicitly says 'cv T or cv T&').
//
// See also: http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#388
//
// TL;DR: it is an unresolved C++ ABI defect that these do catch
// Test that every combination of handler of type:
// cv1 Base * cv2 &
// catches an exception of type:
// Derived *
assert_catches< Base * &, Derived *, Derived>();
assert_catches<const Base * &, Derived *, Derived>();
assert_catches< volatile Base * &, Derived *, Derived>();
assert_catches<const volatile Base * &, Derived *, Derived>();
assert_catches< Base * const &, Derived *, Derived>();
assert_catches<const Base * const &, Derived *, Derived>();
assert_catches< volatile Base * const &, Derived *, Derived>();
assert_catches<const volatile Base * const &, Derived *, Derived>();
assert_catches< Base * volatile &, Derived *, Derived>();
assert_catches<const Base * volatile &, Derived *, Derived>();
assert_catches< volatile Base * volatile &, Derived *, Derived>();
assert_catches<const volatile Base * volatile &, Derived *, Derived>();
assert_catches< Base * const volatile &, Derived *, Derived>();
assert_catches<const Base * const volatile &, Derived *, Derived>();
assert_catches< volatile Base * const volatile &, Derived *, Derived>();
assert_catches<const volatile Base * const volatile &, Derived *, Derived>();
}
void f9()
{
// Test that every combination of handler of type:
// cv1 Base * cv2
// cannot catch an exception of type:
// Ambiguous *
assert_cannot_catch< Base * , Ambiguous *, Ambiguous>();
assert_cannot_catch<const Base * , Ambiguous *, Ambiguous>();
assert_cannot_catch< volatile Base * , Ambiguous *, Ambiguous>();
assert_cannot_catch<const volatile Base * , Ambiguous *, Ambiguous>();
assert_cannot_catch< Base * const , Ambiguous *, Ambiguous>();
assert_cannot_catch<const Base * const , Ambiguous *, Ambiguous>();
assert_cannot_catch< volatile Base * const , Ambiguous *, Ambiguous>();
assert_cannot_catch<const volatile Base * const , Ambiguous *, Ambiguous>();
assert_cannot_catch< Base * volatile, Ambiguous *, Ambiguous>();
assert_cannot_catch<const Base * volatile, Ambiguous *, Ambiguous>();
assert_cannot_catch< volatile Base * volatile, Ambiguous *, Ambiguous>();
assert_cannot_catch<const volatile Base * volatile, Ambiguous *, Ambiguous>();
assert_cannot_catch< Base * const volatile, Ambiguous *, Ambiguous>();
assert_cannot_catch<const Base * const volatile, Ambiguous *, Ambiguous>();
assert_cannot_catch< volatile Base * const volatile, Ambiguous *, Ambiguous>();
assert_cannot_catch<const volatile Base * const volatile, Ambiguous *, Ambiguous>();
}
void f10()
{
// Test that every combination of handler of type:
// cv1 Base * cv2
// cannot catch an exception of type:
// Private *
assert_cannot_catch< Base * , Private *, Private>();
assert_cannot_catch<const Base * , Private *, Private>();
assert_cannot_catch< volatile Base * , Private *, Private>();
assert_cannot_catch<const volatile Base * , Private *, Private>();
assert_cannot_catch< Base * const , Private *, Private>();
assert_cannot_catch<const Base * const , Private *, Private>();
assert_cannot_catch< volatile Base * const , Private *, Private>();
assert_cannot_catch<const volatile Base * const , Private *, Private>();
assert_cannot_catch< Base * volatile, Private *, Private>();
assert_cannot_catch<const Base * volatile, Private *, Private>();
assert_cannot_catch< volatile Base * volatile, Private *, Private>();
assert_cannot_catch<const volatile Base * volatile, Private *, Private>();
assert_cannot_catch< Base * const volatile, Private *, Private>();
assert_cannot_catch<const Base * const volatile, Private *, Private>();
assert_cannot_catch< volatile Base * const volatile, Private *, Private>();
assert_cannot_catch<const volatile Base * const volatile, Private *, Private>();
}
void f11()
{
// Test that every combination of handler of type:
// cv1 Base * cv2
// cannot catch an exception of type:
// Protected *
assert_cannot_catch< Base * , Protected *, Protected>();
assert_cannot_catch<const Base * , Protected *, Protected>();
assert_cannot_catch< volatile Base * , Protected *, Protected>();
assert_cannot_catch<const volatile Base * , Protected *, Protected>();
assert_cannot_catch< Base * const , Protected *, Protected>();
assert_cannot_catch<const Base * const , Protected *, Protected>();
assert_cannot_catch< volatile Base * const , Protected *, Protected>();
assert_cannot_catch<const volatile Base * const , Protected *, Protected>();
assert_cannot_catch< Base * volatile, Protected *, Protected>();
assert_cannot_catch<const Base * volatile, Protected *, Protected>();
assert_cannot_catch< volatile Base * volatile, Protected *, Protected>();
assert_cannot_catch<const volatile Base * volatile, Protected *, Protected>();
assert_cannot_catch< Base * const volatile, Protected *, Protected>();
assert_cannot_catch<const Base * const volatile, Protected *, Protected>();
assert_cannot_catch< volatile Base * const volatile, Protected *, Protected>();
assert_cannot_catch<const volatile Base * const volatile, Protected *, Protected>();
}
void f12()
{
// Test that every combination of handler of type:
// cv1 Base * cv2 &
// cannot catch an exception of type:
// Private *
assert_cannot_catch< Base * &, Private *, Private>();
assert_cannot_catch<const Base * &, Private *, Private>();
assert_cannot_catch< volatile Base * &, Private *, Private>();
assert_cannot_catch<const volatile Base * &, Private *, Private>();
assert_cannot_catch< Base * const &, Private *, Private>();
assert_cannot_catch<const Base * const &, Private *, Private>();
assert_cannot_catch< volatile Base * const &, Private *, Private>();
assert_cannot_catch<const volatile Base * const &, Private *, Private>();
assert_cannot_catch< Base * volatile &, Private *, Private>();
assert_cannot_catch<const Base * volatile &, Private *, Private>();
assert_cannot_catch< volatile Base * volatile &, Private *, Private>();
assert_cannot_catch<const volatile Base * volatile &, Private *, Private>();
assert_cannot_catch< Base * const volatile &, Private *, Private>();
assert_cannot_catch<const Base * const volatile &, Private *, Private>();
assert_cannot_catch< volatile Base * const volatile &, Private *, Private>();
assert_cannot_catch<const volatile Base * const volatile &, Private *, Private>();
}
void f13()
{
// Test that every combination of handler of type:
// cv1 Base * cv2 &
// cannot catch an exception of type:
// Protected *
assert_cannot_catch< Base * &, Protected *, Protected>();
assert_cannot_catch<const Base * &, Protected *, Protected>();
assert_cannot_catch< volatile Base * &, Protected *, Protected>();
assert_cannot_catch<const volatile Base * &, Protected *, Protected>();
assert_cannot_catch< Base * const &, Protected *, Protected>();
assert_cannot_catch<const Base * const &, Protected *, Protected>();
assert_cannot_catch< volatile Base * const &, Protected *, Protected>();
assert_cannot_catch<const volatile Base * const &, Protected *, Protected>();
assert_cannot_catch< Base * volatile &, Protected *, Protected>();
assert_cannot_catch<const Base * volatile &, Protected *, Protected>();
assert_cannot_catch< volatile Base * volatile &, Protected *, Protected>();
assert_cannot_catch<const volatile Base * volatile &, Protected *, Protected>();
assert_cannot_catch< Base * const volatile &, Protected *, Protected>();
assert_cannot_catch<const Base * const volatile &, Protected *, Protected>();
assert_cannot_catch< volatile Base * const volatile &, Protected *, Protected>();
assert_cannot_catch<const volatile Base * const volatile &, Protected *, Protected>();
}
int main(int, char**)
{
f1();
f2();
f3();
f4();
f5();
f6();
f7();
f8();
f9();
f10();
f11();
f12();
f13();
return 0;
}