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34acbb653a
First reformat with clang-format 10 # ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D68802
83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_cxxalloc_h
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#define mozilla_cxxalloc_h
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/*
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* We implement the default operators new/delete as part of
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* libmozalloc, replacing their definitions in libstdc++. The
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* operator new* definitions in libmozalloc will never return a NULL
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* pointer.
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*
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* Each operator new immediately below returns a pointer to memory
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* that can be delete'd by any of
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*
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* (1) the matching infallible operator delete immediately below
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* (2) the matching system |operator delete(void*, std::nothrow)|
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* (3) the matching system |operator delete(void*) noexcept(false)|
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*
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* NB: these are declared |noexcept(false)|, though they will never
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* throw that exception. This declaration is consistent with the rule
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* that |::operator new() noexcept(false)| will never return NULL.
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*
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* NB: mozilla::fallible can be used instead of std::nothrow.
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*/
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#ifndef MOZALLOC_EXPORT_NEW
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# define MOZALLOC_EXPORT_NEW MFBT_API
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#endif
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MOZALLOC_EXPORT_NEW void* operator new(size_t size) noexcept(false) {
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return moz_xmalloc(size);
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}
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MOZALLOC_EXPORT_NEW void* operator new(size_t size,
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const std::nothrow_t&) noexcept(true) {
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return malloc_impl(size);
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}
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MOZALLOC_EXPORT_NEW void* operator new[](size_t size) noexcept(false) {
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return moz_xmalloc(size);
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}
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MOZALLOC_EXPORT_NEW void* operator new[](size_t size,
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const std::nothrow_t&) noexcept(true) {
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return malloc_impl(size);
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}
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MOZALLOC_EXPORT_NEW void operator delete(void* ptr) noexcept(true) {
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return free_impl(ptr);
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}
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MOZALLOC_EXPORT_NEW void operator delete(void* ptr,
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const std::nothrow_t&) noexcept(true) {
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return free_impl(ptr);
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}
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MOZALLOC_EXPORT_NEW void operator delete[](void* ptr) noexcept(true) {
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return free_impl(ptr);
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}
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MOZALLOC_EXPORT_NEW void operator delete[](
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void* ptr, const std::nothrow_t&) noexcept(true) {
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return free_impl(ptr);
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}
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#if defined(XP_WIN)
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// We provide the global sized delete overloads unconditionally because the
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// MSVC runtime headers do, despite compiling with /Zc:sizedDealloc-
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MOZALLOC_EXPORT_NEW void operator delete(void* ptr,
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size_t /*size*/) noexcept(true) {
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return free_impl(ptr);
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}
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MOZALLOC_EXPORT_NEW void operator delete[](void* ptr,
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size_t /*size*/) noexcept(true) {
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return free_impl(ptr);
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}
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#endif
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#endif /* mozilla_cxxalloc_h */
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