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Re: C++ PATCH for C++14 sized deallocation
- From: Jason Merrill <jason at redhat dot com>
- To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 30 Oct 2015 15:32:56 -0400
- Subject: Re: C++ PATCH for C++14 sized deallocation
- Authentication-results: sourceware.org; auth=none
- References: <548F28D2 dot 5090505 at redhat dot com>
On 12/15/2014 01:30 PM, Jason Merrill wrote:
This patch implements the last remaining language feature for C++14,
global sized deallocation. C++ has always had sized deallocation at
class scope, but didn't for deletes that use the global operator delete.
The support can be controlled separately from the -std level with the
-fsized-deallocation flag (same as clang).
The compiler will warn about the unsized variant being defined without
the sized variant (or vice versa) with the -Wsized-deallocation flag,
which is also enabled by -Wextra.
This patch also adds -Wc++14-compat, which currently only warns about a
deallocation function with a second size_t parameter changing from being
a placement delete to a usual deallocation function.
Tested x86_64-pc-linux-gnu, applying to trunk.
I suppose we should also declare these functions in <new>.
Jason
commit d37df45bae7ad7afb1825dd294eefea0781b245f
Author: Jason Merrill <jason@redhat.com>
Date: Thu Oct 29 11:27:33 2015 -0400
* libsupc++/new: Declare sized deletes.
diff --git a/libstdc++-v3/libsupc++/new b/libstdc++-v3/libsupc++/new
index bd50b6c..0f6a05a 100644
--- a/libstdc++-v3/libsupc++/new
+++ b/libstdc++-v3/libsupc++/new
@@ -116,6 +116,12 @@ void operator delete(void*) _GLIBCXX_USE_NOEXCEPT
__attribute__((__externally_visible__));
void operator delete[](void*) _GLIBCXX_USE_NOEXCEPT
__attribute__((__externally_visible__));
+#if __cpp_sized_deallocation
+void operator delete(void*, std::size_t) _GLIBCXX_USE_NOEXCEPT
+ __attribute__((__externally_visible__));
+void operator delete[](void*, std::size_t) _GLIBCXX_USE_NOEXCEPT
+ __attribute__((__externally_visible__));
+#endif
void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
__attribute__((__externally_visible__));
void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
@@ -124,6 +130,12 @@ void operator delete(void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
__attribute__((__externally_visible__));
void operator delete[](void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
__attribute__((__externally_visible__));
+#if __cpp_sized_deallocation
+void operator delete(void*, std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
+ __attribute__((__externally_visible__));
+void operator delete[](void*, std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
+ __attribute__((__externally_visible__));
+#endif
// Default placement versions of operator new.
inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT