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Use static pointer to member when catching nullptr

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libstdc++-v3:

	* libsupc++/pbase_type_info.cc (__pbase_type_info::__do_catch): Use
	static objects for catching nullptr as pointer to member types.

gcc/testsuite:

	* g++.dg/cpp0x/nullptr35.C: Change expected result for catching as
	pointer to member function and also test catching by reference.

From-SVN: r238532
This commit is contained in:
Jonathan Wakely 2016-07-20 19:21:48 +01:00 committed by Jonathan Wakely
parent 4c07fd98b8
commit 18407bfb2c
4 changed files with 48 additions and 7 deletions
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5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2016-07-20 Jonathan Wakely <jwakely@redhat.com>
* g++.dg/cpp0x/nullptr35.C: Change expected result for catching as
pointer to member function and also test catching by reference.
2016-07-20 Dominik Vogt <vogt@linux.vnet.ibm.com>
* gcc.target/s390/pr67443.c: Fix test case.

33
gcc/testsuite/g++.dg/cpp0x/nullptr35.C
View File

@ -39,7 +39,7 @@ int main()
caught(4);
throw;
}
} catch (int (A::*pmf)()) { // FIXME: currently unsupported
} catch (int (A::*pmf)()) {
if (pmf == nullptr)
caught(8);
throw;
@ -47,6 +47,35 @@ int main()
} catch (nullptr_t) {
}
if (result != 7) // should be 15
try {
try {
try {
try {
try {
throw nullptr;
} catch (void* const& p) {
if (p == nullptr)
caught(16);
throw;
}
} catch (void(* const& pf)()) {
if (pf == nullptr)
caught(32);
throw;
}
} catch (int A::* const& pm) {
if (pm == nullptr)
caught(64);
throw;
}
} catch (int (A::* const& pmf)()) {
if (pmf == nullptr)
caught(128);
throw;
}
} catch (nullptr_t) {
}
if (result != 255)
abort ();
}

5
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,8 @@
2016-07-20 Jonathan Wakely <jwakely@redhat.com>
* libsupc++/pbase_type_info.cc (__pbase_type_info::__do_catch): Use
static objects for catching nullptr as pointer to member types.
2016-07-18 Ville Voutilainen <ville.voutilainen@gmail.com>
Clean up optional's comments.

12
libstdc++-v3/libsupc++/pbase_type_info.cc
View File

@ -50,14 +50,16 @@ __do_catch (const type_info *thr_type,
{
if (__pointee->__is_function_p ())
{
// A pointer-to-member-function is two words <ptr,adj> but the
// nullptr_t exception object at *(nullptr_t*)*thr_obj is only
// one word, so we can't safely return it as a PMF. FIXME.
return false;
using pmf_type = void (__pbase_type_info::*)();
static const pmf_type pmf = nullptr;
*thr_obj = const_cast<pmf_type*>(&pmf);
return true;
}
else
{
*(ptrdiff_t*)*thr_obj = -1; // null pointer to data member
using pm_type = int __pbase_type_info::*;
static const pm_type pm = nullptr;
*thr_obj = const_cast<pm_type*>(&pm);
return true;
}
}