vsapsai updated this revision to Diff 139506.
vsapsai added a comment.
- Replace `function::operator=(nullptr);` with `*this = nullptr;`
https://reviews.llvm.org/D34331
Files:
libcxx/include/__functional_03
libcxx/include/functional
libcxx/test/libcxx/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/move_reentrant.pass.cpp
libcxx/test/libcxx/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign_reentrant.pass.cpp
Index: libcxx/test/libcxx/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign_reentrant.pass.cpp
===================================================================
--- /dev/null
+++ libcxx/test/libcxx/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/nullptr_t_assign_reentrant.pass.cpp
@@ -0,0 +1,46 @@
+//===----------------------------------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <functional>
+
+// class function<R(ArgTypes...)>
+
+// function& operator=(nullptr_t);
+
+#include <functional>
+#include <cassert>
+
+#include "test_macros.h"
+
+struct A
+{
+ static std::function<void()> global;
+ static bool cancel;
+
+ ~A() {
+ DoNotOptimize(cancel);
+ if (cancel)
+ global = nullptr;
+ }
+ void operator()() {}
+};
+
+std::function<void()> A::global;
+bool A::cancel = false;
+
+int main()
+{
+ A::global = A();
+ assert(A::global.target<A>());
+
+ // Check that we don't recurse in A::~A().
+ A::cancel = true;
+ A::global = nullptr;
+ assert(!A::global.target<A>());
+}
Index: libcxx/test/libcxx/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/move_reentrant.pass.cpp
===================================================================
--- /dev/null
+++ libcxx/test/libcxx/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.con/move_reentrant.pass.cpp
@@ -0,0 +1,46 @@
+//===----------------------------------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <functional>
+
+// class function<R(ArgTypes...)>
+
+// function& operator=(function &&);
+
+#include <functional>
+#include <cassert>
+
+#include "test_macros.h"
+
+struct A
+{
+ static std::function<void()> global;
+ static bool cancel;
+
+ ~A() {
+ DoNotOptimize(cancel);
+ if (cancel)
+ global = std::function<void()>(nullptr);
+ }
+ void operator()() {}
+};
+
+std::function<void()> A::global;
+bool A::cancel = false;
+
+int main()
+{
+ A::global = A();
+ assert(A::global.target<A>());
+
+ // Check that we don't recurse in A::~A().
+ A::cancel = true;
+ A::global = std::function<void()>(nullptr);
+ assert(!A::global.target<A>());
+}
Index: libcxx/include/functional
===================================================================
--- libcxx/include/functional
+++ libcxx/include/functional
@@ -1818,11 +1818,7 @@
function<_Rp(_ArgTypes...)>&
function<_Rp(_ArgTypes...)>::operator=(function&& __f) _NOEXCEPT
{
- if ((void *)__f_ == &__buf_)
- __f_->destroy();
- else if (__f_)
- __f_->destroy_deallocate();
- __f_ = 0;
+ *this = nullptr;
if (__f.__f_ == 0)
__f_ = 0;
else if ((void *)__f.__f_ == &__f.__buf_)
@@ -1842,11 +1838,12 @@
function<_Rp(_ArgTypes...)>&
function<_Rp(_ArgTypes...)>::operator=(nullptr_t) _NOEXCEPT
{
- if ((void *)__f_ == &__buf_)
- __f_->destroy();
- else if (__f_)
- __f_->destroy_deallocate();
+ __base* __t = __f_;
__f_ = 0;
+ if ((void *)__t == &__buf_)
+ __t->destroy();
+ else if (__t)
+ __t->destroy_deallocate();
return *this;
}
Index: libcxx/include/__functional_03
===================================================================
--- libcxx/include/__functional_03
+++ libcxx/include/__functional_03
@@ -600,19 +600,23 @@
function<_Rp()>&
function<_Rp()>::operator=(const function& __f)
{
- function(__f).swap(*this);
+ if (__f)
+ function(__f).swap(*this);
+ else
+ *this = nullptr;
return *this;
}
template<class _Rp>
function<_Rp()>&
function<_Rp()>::operator=(nullptr_t)
{
- if (__f_ == (__base*)&__buf_)
- __f_->destroy();
- else if (__f_)
- __f_->destroy_deallocate();
+ __base* __t = __f_;
__f_ = 0;
+ if (__t == (__base*)&__buf_)
+ __t->destroy();
+ else if (__t)
+ __t->destroy_deallocate();
return *this;
}
@@ -876,19 +880,23 @@
function<_Rp(_A0)>&
function<_Rp(_A0)>::operator=(const function& __f)
{
- function(__f).swap(*this);
+ if (__f)
+ function(__f).swap(*this);
+ else
+ *this = nullptr;
return *this;
}
template<class _Rp, class _A0>
function<_Rp(_A0)>&
function<_Rp(_A0)>::operator=(nullptr_t)
{
- if (__f_ == (__base*)&__buf_)
- __f_->destroy();
- else if (__f_)
- __f_->destroy_deallocate();
+ __base* __t = __f_;
__f_ = 0;
+ if (__t == (__base*)&__buf_)
+ __t->destroy();
+ else if (__t)
+ __t->destroy_deallocate();
return *this;
}
@@ -1152,19 +1160,23 @@
function<_Rp(_A0, _A1)>&
function<_Rp(_A0, _A1)>::operator=(const function& __f)
{
- function(__f).swap(*this);
+ if (__f)
+ function(__f).swap(*this);
+ else
+ *this = nullptr;
return *this;
}
template<class _Rp, class _A0, class _A1>
function<_Rp(_A0, _A1)>&
function<_Rp(_A0, _A1)>::operator=(nullptr_t)
{
- if (__f_ == (__base*)&__buf_)
- __f_->destroy();
- else if (__f_)
- __f_->destroy_deallocate();
+ __base* __t = __f_;
__f_ = 0;
+ if (__t == (__base*)&__buf_)
+ __t->destroy();
+ else if (__t)
+ __t->destroy_deallocate();
return *this;
}
@@ -1428,19 +1440,23 @@
function<_Rp(_A0, _A1, _A2)>&
function<_Rp(_A0, _A1, _A2)>::operator=(const function& __f)
{
- function(__f).swap(*this);
+ if (__f)
+ function(__f).swap(*this);
+ else
+ *this = nullptr;
return *this;
}
template<class _Rp, class _A0, class _A1, class _A2>
function<_Rp(_A0, _A1, _A2)>&
function<_Rp(_A0, _A1, _A2)>::operator=(nullptr_t)
{
- if (__f_ == (__base*)&__buf_)
- __f_->destroy();
- else if (__f_)
- __f_->destroy_deallocate();
+ __base* __t = __f_;
__f_ = 0;
+ if (__t == (__base*)&__buf_)
+ __t->destroy();
+ else if (__t)
+ __t->destroy_deallocate();
return *this;
}
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