hardened_malloc/new.cc

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#include <stdlib.h>
#include <new>
#include <bits/functexcept.h>
#define noreturn
extern "C" {
#include "malloc.h"
#include "util.h"
}
COLD static void *handle_out_of_memory(size_t size, bool nothrow) {
void *ptr;
do {
std::new_handler handler = std::get_new_handler();
if (handler == nullptr) {
break;
}
try {
handler();
} catch (const std::bad_alloc &) {
break;
}
ptr = h_malloc(size);
} while (ptr == nullptr);
if (ptr == nullptr && !nothrow) {
std::__throw_bad_alloc();
}
return ptr;
}
static inline void *new_impl(size_t size, bool nothrow) {
void *ptr = h_malloc(size);
if (likely(ptr != nullptr)) {
return ptr;
}
return handle_out_of_memory(size, nothrow);
}
void *operator new(size_t size) {
return new_impl(size, false);
}
void *operator new[](size_t size) {
return new_impl(size, false);
}
void *operator new(size_t size, const std::nothrow_t &) noexcept {
return new_impl(size, true);
}
void *operator new[](size_t size, const std::nothrow_t &) noexcept {
return new_impl(size, true);
}
void operator delete(void *ptr) noexcept {
h_free(ptr);
}
void operator delete[](void *ptr) noexcept {
h_free(ptr);
}
void operator delete(void *ptr, const std::nothrow_t &) noexcept {
h_free(ptr);
}
void operator delete[](void *ptr, const std::nothrow_t &) noexcept {
h_free(ptr);
}
void operator delete(void *ptr, size_t size) noexcept {
h_free_sized(ptr, size);
}
void operator delete[](void *ptr, size_t size) noexcept {
h_free_sized(ptr, size);
}