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