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jemalloc_cpp.cpp
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308 lines (238 loc) · 7.51 KB
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#include <mutex>
#include <new>
// NOLINTBEGIN(misc-use-anonymous-namespace)
#ifdef __cplusplus
extern "C" {
#endif
#include "jemalloc/internal/jemalloc_preamble.h"
#include "jemalloc/internal/jemalloc_internal_includes.h"
#ifdef __cplusplus
}
#endif
// All operators in this file are exported.
// Possibly alias hidden versions of malloc and sdallocx to avoid an extra plt
// thunk?
//
// extern __typeof (sdallocx) sdallocx_int
// __attribute ((alias ("sdallocx"),
// visibility ("hidden")));
//
// ... but it needs to work with jemalloc namespaces.
void *operator new(std::size_t size);
void *operator new[](std::size_t size);
void *operator new(std::size_t size, const std::nothrow_t &) noexcept;
void *operator new[](std::size_t size, const std::nothrow_t &) noexcept;
void operator delete(void *ptr) noexcept;
void operator delete[](void *ptr) noexcept;
void operator delete(void *ptr, const std::nothrow_t &) noexcept;
void operator delete[](void *ptr, const std::nothrow_t &) noexcept;
#if __cpp_sized_deallocation >= 201309
/* C++14's sized-delete operators. */
void operator delete(void *ptr, std::size_t size) noexcept;
void operator delete[](void *ptr, std::size_t size) noexcept;
#endif
#if __cpp_aligned_new >= 201606
/* C++17's over-aligned operators. */
void *operator new(std::size_t size, std::align_val_t);
void *operator new(std::size_t size, std::align_val_t, const std::nothrow_t &) noexcept;
void *operator new[](std::size_t size, std::align_val_t);
void *operator new[](std::size_t size, std::align_val_t, const std::nothrow_t &) noexcept;
void operator delete(void* ptr, std::align_val_t) noexcept;
void operator delete(void* ptr, std::align_val_t, const std::nothrow_t &) noexcept;
void operator delete(void* ptr, std::size_t size, std::align_val_t al) noexcept;
void operator delete[](void* ptr, std::align_val_t) noexcept;
void operator delete[](void* ptr, std::align_val_t, const std::nothrow_t &) noexcept;
void operator delete[](void* ptr, std::size_t size, std::align_val_t al) noexcept;
#endif
JEMALLOC_NOINLINE
static void *
handleOOM(std::size_t size, bool nothrow) {
if (opt_experimental_infallible_new) {
const char *huge_warning = (size >= ((std::size_t)1 << 30)) ?
"This may be caused by heap corruption, if the large size "
"is unexpected (suggest building with sanitizers for "
"debugging)." : "";
safety_check_fail("<jemalloc>: Allocation of size %zu failed. "
"%s opt.experimental_infallible_new is true. Aborting.\n",
size, huge_warning);
return nullptr;
}
void *ptr = nullptr;
while (ptr == nullptr) {
std::new_handler handler;
// GCC-4.8 and clang 4.0 do not have std::get_new_handler.
{
static std::mutex mtx;
std::lock_guard<std::mutex> lock(mtx);
handler = std::set_new_handler(nullptr);
std::set_new_handler(handler);
}
if (handler == nullptr)
break;
try {
handler();
} catch (const std::bad_alloc &) {
break;
}
ptr = je_malloc(size);
}
if (ptr == nullptr && !nothrow)
std::__throw_bad_alloc();
return ptr;
}
template <bool IsNoExcept>
JEMALLOC_NOINLINE
static void *
fallbackNewImpl(std::size_t size) noexcept(IsNoExcept) {
void *ptr = malloc_default(size);
if (likely(ptr != nullptr)) {
return ptr;
}
return handleOOM(size, IsNoExcept);
}
template <bool IsNoExcept>
JEMALLOC_ALWAYS_INLINE
void *
newImpl(std::size_t size) noexcept(IsNoExcept) {
LOG("core.operator_new.entry", "size: %zu", size);
void * ret = imalloc_fastpath(size, &fallbackNewImpl<IsNoExcept>);
LOG("core.operator_new.exit", "result: %p", ret);
return ret;
}
void *
operator new(std::size_t size) {
return newImpl<false>(size);
}
void *
operator new[](std::size_t size) {
return newImpl<false>(size);
}
void *
operator new(std::size_t size, const std::nothrow_t &) noexcept {
return newImpl<true>(size);
}
void *
operator new[](std::size_t size, const std::nothrow_t &) noexcept {
return newImpl<true>(size);
}
#if __cpp_aligned_new >= 201606
template <bool IsNoExcept>
JEMALLOC_ALWAYS_INLINE
void *
alignedNewImpl(std::size_t size, std::align_val_t alignment) noexcept(IsNoExcept) {
void *ptr = je_aligned_alloc(static_cast<std::size_t>(alignment), size);
if (likely(ptr != nullptr)) {
return ptr;
}
return handleOOM(size, IsNoExcept);
}
void *
operator new(std::size_t size, std::align_val_t alignment) {
return alignedNewImpl<false>(size, alignment);
}
void *
operator new[](std::size_t size, std::align_val_t alignment) {
return alignedNewImpl<false>(size, alignment);
}
void *
operator new(std::size_t size, std::align_val_t alignment, const std::nothrow_t &) noexcept {
return alignedNewImpl<true>(size, alignment);
}
void *
operator new[](std::size_t size, std::align_val_t alignment, const std::nothrow_t &) noexcept {
return alignedNewImpl<true>(size, alignment);
}
#endif // __cpp_aligned_new
void
operator delete(void *ptr) noexcept {
LOG("core.operator_delete.entry", "ptr: %p", ptr);
je_free_impl(ptr);
LOG("core.operator_delete.exit", "");
}
void
operator delete[](void *ptr) noexcept {
LOG("core.operator_delete.entry", "ptr: %p", ptr);
je_free_impl(ptr);
LOG("core.operator_delete.exit", "");
}
void
operator delete(void *ptr, const std::nothrow_t &) noexcept {
LOG("core.operator_delete.entry", "ptr: %p", ptr);
je_free_impl(ptr);
LOG("core.operator_delete.exit", "");
}
void operator delete[](void *ptr, const std::nothrow_t &) noexcept {
LOG("core.operator_delete.entry", "ptr: %p", ptr);
je_free_impl(ptr);
LOG("core.operator_delete.exit", "");
}
#if __cpp_sized_deallocation >= 201309
JEMALLOC_ALWAYS_INLINE
void
sizedDeleteImpl(void* ptr, std::size_t size) noexcept {
if (unlikely(ptr == nullptr)) {
return;
}
LOG("core.operator_delete.entry", "ptr: %p, size: %zu", ptr, size);
je_sdallocx_noflags(ptr, size);
LOG("core.operator_delete.exit", "");
}
void
operator delete(void *ptr, std::size_t size) noexcept {
sizedDeleteImpl(ptr, size);
}
void
operator delete[](void *ptr, std::size_t size) noexcept {
sizedDeleteImpl(ptr, size);
}
#endif // __cpp_sized_deallocation
#if __cpp_aligned_new >= 201606
JEMALLOC_ALWAYS_INLINE
void
alignedSizedDeleteImpl(void* ptr, std::size_t size, std::align_val_t alignment)
noexcept {
if (config_debug) {
assert(((size_t)alignment & ((size_t)alignment - 1)) == 0);
}
if (unlikely(ptr == nullptr)) {
return;
}
LOG("core.operator_delete.entry", "ptr: %p, size: %zu, alignment: %zu",
ptr, size, alignment);
je_sdallocx_impl(ptr, size, MALLOCX_ALIGN(alignment));
LOG("core.operator_delete.exit", "");
}
void
operator delete(void* ptr, std::align_val_t) noexcept {
LOG("core.operator_delete.entry", "ptr: %p", ptr);
je_free_impl(ptr);
LOG("core.operator_delete.exit", "");
}
void
operator delete[](void* ptr, std::align_val_t) noexcept {
LOG("core.operator_delete.entry", "ptr: %p", ptr);
je_free_impl(ptr);
LOG("core.operator_delete.exit", "");
}
void
operator delete(void* ptr, std::align_val_t, const std::nothrow_t&) noexcept {
LOG("core.operator_delete.entry", "ptr: %p", ptr);
je_free_impl(ptr);
LOG("core.operator_delete.exit", "");
}
void
operator delete[](void* ptr, std::align_val_t, const std::nothrow_t&) noexcept {
LOG("core.operator_delete.entry", "ptr: %p", ptr);
je_free_impl(ptr);
LOG("core.operator_delete.exit", "");
}
void
operator delete(void* ptr, std::size_t size, std::align_val_t alignment) noexcept {
alignedSizedDeleteImpl(ptr, size, alignment);
}
void
operator delete[](void* ptr, std::size_t size, std::align_val_t alignment) noexcept {
alignedSizedDeleteImpl(ptr, size, alignment);
}
#endif // __cpp_aligned_new
// NOLINTEND(misc-use-anonymous-namespace)