//===-- dfsan_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 DataflowSanitizer.
//
// Interceptors for operators new and delete.
//===----------------------------------------------------------------------===//

#include <stddef.h>

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

using namespace __dfsan;

// Fake std::nothrow_t and std::align_val_t to avoid including <new>.
namespace std {
struct nothrow_t {};
enum class align_val_t : size_t {};
}  // namespace std

// TODO(alekseys): throw std::bad_alloc instead of dying on OOM.
#define OPERATOR_NEW_BODY(nothrow)   \
  void *res = dfsan_malloc(size);    \
  if (!nothrow && UNLIKELY(!res)) {  \
    BufferedStackTrace stack;        \
    ReportOutOfMemory(size, &stack); \
  }                                  \
  return res
#define OPERATOR_NEW_BODY_ALIGN(nothrow)         \
  void *res = dfsan_memalign((uptr)align, size); \
  if (!nothrow && UNLIKELY(!res)) {              \
    BufferedStackTrace stack;                    \
    ReportOutOfMemory(size, &stack);             \
  }                                              \
  return res;

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

#define OPERATOR_DELETE_BODY \
  if (ptr)                   \
  dfsan_deallocate(ptr)

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