//===-- hwasan_new_delete.cpp ---------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file is a part of HWAddressSanitizer.
//
// Interceptors for operators new and delete.
//===----------------------------------------------------------------------===//

#include "hwasan.h"
#include "interception/interception.h"
#include "sanitizer_common/sanitizer_allocator.h"
#include "sanitizer_common/sanitizer_allocator_report.h"

#include <stddef.h>
#include <stdlib.h>

#if HWASAN_REPLACE_OPERATORS_NEW_AND_DELETE

// TODO(alekseys): throw std::bad_alloc instead of dying on OOM.
#define OPERATOR_NEW_BODY(nothrow) \
  GET_MALLOC_STACK_TRACE; \
  void *res = hwasan_malloc(size, &stack);\
  if (!nothrow && UNLIKELY(!res)) ReportOutOfMemory(size, &stack);\
  return res
#define OPERATOR_NEW_ALIGN_BODY(nothrow)                                    \
  GET_MALLOC_STACK_TRACE;                                                   \
  void *res = hwasan_aligned_alloc(static_cast<uptr>(align), size, &stack); \
  if (!nothrow && UNLIKELY(!res))                                           \
    ReportOutOfMemory(size, &stack);                                        \
  return res

#define OPERATOR_DELETE_BODY \
  GET_MALLOC_STACK_TRACE; \
  if (ptr) hwasan_free(ptr, &stack)

#elif defined(__ANDROID__)

// We don't actually want to intercept operator new and delete on Android, but
// since we previously released a runtime that intercepted these functions,
// removing the interceptors would break ABI. Therefore we simply forward to
// malloc and free.
#define OPERATOR_NEW_BODY(nothrow) return malloc(size)
#define OPERATOR_DELETE_BODY free(ptr)

#endif

#ifdef OPERATOR_NEW_BODY

using namespace __hwasan;

// Fake std::nothrow_t to avoid including <new>.
namespace std {
  struct nothrow_t {};
}  // namespace std


INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
void *operator new(size_t size) { OPERATOR_NEW_BODY(false /*nothrow*/); }
INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
void *operator new[](size_t size) { OPERATOR_NEW_BODY(false /*nothrow*/); }
INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
void *operator new(size_t size, std::nothrow_t const&) {
  OPERATOR_NEW_BODY(true /*nothrow*/);
}
INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
void *operator new[](size_t size, std::nothrow_t const&) {
  OPERATOR_NEW_BODY(true /*nothrow*/);
}

INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void operator delete(void *ptr)
    NOEXCEPT {
  OPERATOR_DELETE_BODY;
}
INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void operator delete[](
    void *ptr) NOEXCEPT {
  OPERATOR_DELETE_BODY;
}
INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void operator delete(
    void *ptr, std::nothrow_t const &) {
  OPERATOR_DELETE_BODY;
}
INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void operator delete[](
    void *ptr, std::nothrow_t const &) {
  OPERATOR_DELETE_BODY;
}

#endif  // OPERATOR_NEW_BODY

#ifdef OPERATOR_NEW_ALIGN_BODY

namespace std {
enum class align_val_t : size_t {};
}  // namespace std

INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void *operator new(
    size_t size, std::align_val_t align) {
  OPERATOR_NEW_ALIGN_BODY(false /*nothrow*/);
}
INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void *operator new[](
    size_t size, std::align_val_t align) {
  OPERATOR_NEW_ALIGN_BODY(false /*nothrow*/);
}
INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void *operator new(
    size_t size, std::align_val_t align, std::nothrow_t const &) {
  OPERATOR_NEW_ALIGN_BODY(true /*nothrow*/);
}
INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void *operator new[](
    size_t size, std::align_val_t align, std::nothrow_t const &) {
  OPERATOR_NEW_ALIGN_BODY(true /*nothrow*/);
}

INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void operator delete(
    void *ptr, std::align_val_t align) NOEXCEPT {
  OPERATOR_DELETE_BODY;
}
INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void operator delete[](
    void *ptr, std::align_val_t) NOEXCEPT {
  OPERATOR_DELETE_BODY;
}
INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void operator delete(
    void *ptr, std::align_val_t, std::nothrow_t const &) NOEXCEPT {
  OPERATOR_DELETE_BODY;
}
INTERCEPTOR_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void operator delete[](
    void *ptr, std::align_val_t, std::nothrow_t const &) NOEXCEPT {
  OPERATOR_DELETE_BODY;
}

#endif  // OPERATOR_NEW_ALIGN_BODY