//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "__cxxabi_config.h"
#include "abort_message.h"
#include "include/overridable_function.h" // from libc++
#include <__memory/aligned_alloc.h>
#include <cstddef>
#include <cstdlib>
#include <new>
// Perform a few sanity checks on libc++ and libc++abi macros to ensure that
// the code below can be an exact copy of the code in libcxx/src/new.cpp.
#if !defined(_THROW_BAD_ALLOC)
# error The _THROW_BAD_ALLOC macro should be already defined by libc++
#endif
#ifndef _LIBCPP_WEAK
# error The _LIBCPP_WEAK macro should be already defined by libc++
#endif
#if defined(_LIBCXXABI_NO_EXCEPTIONS) != defined(_LIBCPP_HAS_NO_EXCEPTIONS)
# error libc++ and libc++abi seem to disagree on whether exceptions are enabled
#endif
inline void __throw_bad_alloc_shim() {
#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
throw std::bad_alloc();
#else
abort_message("bad_alloc was thrown in -fno-exceptions mode");
#endif
}
#define _LIBCPP_ASSERT_SHIM(expr, str) \
do { \
if (!expr) \
abort_message(str); \
} while (false)
// ------------------ BEGIN COPY ------------------
// Implement all new and delete operators as weak definitions
// in this shared library, so that they can be overridden by programs
// that define non-weak copies of the functions.
static void* operator_new_impl(std::size_t size) {
if (size == 0)
size = 1;
void* p;
while ((p = std::malloc(size)) == nullptr) {
// If malloc fails and there is a new_handler,
// call it to try free up memory.
std::new_handler nh = std::get_new_handler();
if (nh)
nh();
else
break;
}
return p;
}
_LIBCPP_MAKE_OVERRIDABLE_FUNCTION_DETECTABLE _LIBCPP_WEAK void* operator new(std::size_t size) _THROW_BAD_ALLOC {
void* p = operator_new_impl(size);
if (p == nullptr)
__throw_bad_alloc_shim();
return p;
}
_LIBCPP_WEAK void* operator new(size_t size, const std::nothrow_t&) noexcept {
#ifdef _LIBCPP_HAS_NO_EXCEPTIONS
# if _LIBCPP_CAN_DETECT_OVERRIDDEN_FUNCTION
_LIBCPP_ASSERT_SHIM(
!std::__is_function_overridden(static_cast<void* (*)(std::size_t)>(&operator new)),
"libc++ was configured with exceptions disabled and `operator new(size_t)` has been overridden, "
"but `operator new(size_t, nothrow_t)` has not been overridden. This is problematic because "
"`operator new(size_t, nothrow_t)` must call `operator new(size_t)`, which will terminate in case "
"it fails to allocate, making it impossible for `operator new(size_t, nothrow_t)` to fulfill its "
"contract (since it should return nullptr upon failure). Please make sure you override "
"`operator new(size_t, nothrow_t)` as well.");
# endif
return operator_new_impl(size);
#else
void* p = nullptr;
try {
p = ::operator new(size);
} catch (...) {
}
return p;
#endif
}
_LIBCPP_MAKE_OVERRIDABLE_FUNCTION_DETECTABLE _LIBCPP_WEAK void* operator new[](size_t size) _THROW_BAD_ALLOC {
return ::operator new(size);
}
_LIBCPP_WEAK void* operator new[](size_t size, const std::nothrow_t&) noexcept {
#ifdef _LIBCPP_HAS_NO_EXCEPTIONS
# if _LIBCPP_CAN_DETECT_OVERRIDDEN_FUNCTION
_LIBCPP_ASSERT_SHIM(
!std::__is_function_overridden(static_cast<void* (*)(std::size_t)>(&operator new[])),
"libc++ was configured with exceptions disabled and `operator new[](size_t)` has been overridden, "
"but `operator new[](size_t, nothrow_t)` has not been overridden. This is problematic because "
"`operator new[](size_t, nothrow_t)` must call `operator new[](size_t)`, which will terminate in case "
"it fails to allocate, making it impossible for `operator new[](size_t, nothrow_t)` to fulfill its "
"contract (since it should return nullptr upon failure). Please make sure you override "
"`operator new[](size_t, nothrow_t)` as well.");
# endif
return operator_new_impl(size);
#else
void* p = nullptr;
try {
p = ::operator new[](size);
} catch (...) {
}
return p;
#endif
}
_LIBCPP_WEAK void operator delete(void* ptr) noexcept { std::free(ptr); }
_LIBCPP_WEAK void operator delete(void* ptr, const std::nothrow_t&) noexcept { ::operator delete(ptr); }
_LIBCPP_WEAK void operator delete(void* ptr, size_t) noexcept { ::operator delete(ptr); }
_LIBCPP_WEAK void operator delete[](void* ptr) noexcept { ::operator delete(ptr); }
_LIBCPP_WEAK void operator delete[](void* ptr, const std::nothrow_t&) noexcept { ::operator delete[](ptr); }
_LIBCPP_WEAK void operator delete[](void* ptr, size_t) noexcept { ::operator delete[](ptr); }
#if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION)
static void* operator_new_aligned_impl(std::size_t size, std::align_val_t alignment) {
if (size == 0)
size = 1;
if (static_cast<size_t>(alignment) < sizeof(void*))
alignment = std::align_val_t(sizeof(void*));
// Try allocating memory. If allocation fails and there is a new_handler,
// call it to try free up memory, and try again until it succeeds, or until
// the new_handler decides to terminate.
void* p;
while ((p = std::__libcpp_aligned_alloc(static_cast<std::size_t>(alignment), size)) == nullptr) {
std::new_handler nh = std::get_new_handler();
if (nh)
nh();
else
break;
}
return p;
}
_LIBCPP_MAKE_OVERRIDABLE_FUNCTION_DETECTABLE _LIBCPP_WEAK void*
operator new(std::size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC {
void* p = operator_new_aligned_impl(size, alignment);
if (p == nullptr)
__throw_bad_alloc_shim();
return p;
}
_LIBCPP_WEAK void* operator new(size_t size, std::align_val_t alignment, const std::nothrow_t&) noexcept {
# ifdef _LIBCPP_HAS_NO_EXCEPTIONS
# if _LIBCPP_CAN_DETECT_OVERRIDDEN_FUNCTION
_LIBCPP_ASSERT_SHIM(
!std::__is_function_overridden(static_cast<void* (*)(std::size_t, std::align_val_t)>(&operator new)),
"libc++ was configured with exceptions disabled and `operator new(size_t, align_val_t)` has been overridden, "
"but `operator new(size_t, align_val_t, nothrow_t)` has not been overridden. This is problematic because "
"`operator new(size_t, align_val_t, nothrow_t)` must call `operator new(size_t, align_val_t)`, which will "
"terminate in case it fails to allocate, making it impossible for `operator new(size_t, align_val_t, nothrow_t)` "
"to fulfill its contract (since it should return nullptr upon failure). Please make sure you override "
"`operator new(size_t, align_val_t, nothrow_t)` as well.");
# endif
return operator_new_aligned_impl(size, alignment);
# else
void* p = nullptr;
try {
p = ::operator new(size, alignment);
} catch (...) {
}
return p;
# endif
}
_LIBCPP_MAKE_OVERRIDABLE_FUNCTION_DETECTABLE _LIBCPP_WEAK void*
operator new[](size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC {
return ::operator new(size, alignment);
}
_LIBCPP_WEAK void* operator new[](size_t size, std::align_val_t alignment, const std::nothrow_t&) noexcept {
# ifdef _LIBCPP_HAS_NO_EXCEPTIONS
# if _LIBCPP_CAN_DETECT_OVERRIDDEN_FUNCTION
_LIBCPP_ASSERT_SHIM(
!std::__is_function_overridden(static_cast<void* (*)(std::size_t, std::align_val_t)>(&operator new[])),
"libc++ was configured with exceptions disabled and `operator new[](size_t, align_val_t)` has been overridden, "
"but `operator new[](size_t, align_val_t, nothrow_t)` has not been overridden. This is problematic because "
"`operator new[](size_t, align_val_t, nothrow_t)` must call `operator new[](size_t, align_val_t)`, which will "
"terminate in case it fails to allocate, making it impossible for `operator new[](size_t, align_val_t, "
"nothrow_t)` to fulfill its contract (since it should return nullptr upon failure). Please make sure you "
"override "
"`operator new[](size_t, align_val_t, nothrow_t)` as well.");
# endif
return operator_new_aligned_impl(size, alignment);
# else
void* p = nullptr;
try {
p = ::operator new[](size, alignment);
} catch (...) {
}
return p;
# endif
}
_LIBCPP_WEAK void operator delete(void* ptr, std::align_val_t) noexcept { std::__libcpp_aligned_free(ptr); }
_LIBCPP_WEAK void operator delete(void* ptr, std::align_val_t alignment, const std::nothrow_t&) noexcept {
::operator delete(ptr, alignment);
}
_LIBCPP_WEAK void operator delete(void* ptr, size_t, std::align_val_t alignment) noexcept {
::operator delete(ptr, alignment);
}
_LIBCPP_WEAK void operator delete[](void* ptr, std::align_val_t alignment) noexcept {
::operator delete(ptr, alignment);
}
_LIBCPP_WEAK void operator delete[](void* ptr, std::align_val_t alignment, const std::nothrow_t&) noexcept {
::operator delete[](ptr, alignment);
}
_LIBCPP_WEAK void operator delete[](void* ptr, size_t, std::align_val_t alignment) noexcept {
::operator delete[](ptr, alignment);
}
#endif // !_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
// ------------------ END COPY ------------------
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