allocator_shim_override_cpp_symbols.h

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef BASE_ALLOCATOR_ALLOCATOR_SHIM_OVERRIDE_CPP_SYMBOLS_H_
#error This header is meant to be included only once by allocator_shim.cc
#endif
#define BASE_ALLOCATOR_ALLOCATOR_SHIM_OVERRIDE_CPP_SYMBOLS_H_

// Preempt the default new/delete C++ symbols so they call the shim entry
// points. This file is strongly inspired by tcmalloc's
// libc_override_redefine.h.

#include <new>

#include "base/allocator/allocator_shim_internals.h"
#include "build/build_config.h"

// std::align_val_t isn't available until C++17, but we want to override aligned
// new/delete anyway to prevent a possible situation where a library gets loaded
// in that uses the aligned operators.  We want to avoid a situation where
// separate heaps are used.
// TODO(thomasanderson): Remove this once building with C++17 or later.
#if defined(__cpp_aligned_new) && __cpp_aligned_new >= 201606
#define ALIGN_VAL_T std::align_val_t
#define ALIGN_LINKAGE
#define ALIGN_NEW operator new
#define ALIGN_NEW_NOTHROW operator new
#define ALIGN_DEL operator delete
#define ALIGN_DEL_SIZED operator delete
#define ALIGN_DEL_NOTHROW operator delete
#define ALIGN_NEW_ARR operator new[]
#define ALIGN_NEW_ARR_NOTHROW operator new[]
#define ALIGN_DEL_ARR operator delete[]
#define ALIGN_DEL_ARR_SIZED operator delete[]
#define ALIGN_DEL_ARR_NOTHROW operator delete[]
#else
#define ALIGN_VAL_T size_t
#define ALIGN_LINKAGE extern "C"
#if defined(OS_MACOSX) || defined(OS_WIN)
#error "Mangling is different on these platforms."
#else
#define ALIGN_NEW _ZnwmSt11align_val_t
#define ALIGN_NEW_NOTHROW _ZnwmSt11align_val_tRKSt9nothrow_t
#define ALIGN_DEL _ZdlPvSt11align_val_t
#define ALIGN_DEL_SIZED _ZdlPvmSt11align_val_t
#define ALIGN_DEL_NOTHROW _ZdlPvSt11align_val_tRKSt9nothrow_t
#define ALIGN_NEW_ARR _ZnamSt11align_val_t
#define ALIGN_NEW_ARR_NOTHROW _ZnamSt11align_val_tRKSt9nothrow_t
#define ALIGN_DEL_ARR _ZdaPvSt11align_val_t
#define ALIGN_DEL_ARR_SIZED _ZdaPvmSt11align_val_t
#define ALIGN_DEL_ARR_NOTHROW _ZdaPvSt11align_val_tRKSt9nothrow_t
#endif
#endif

SHIM_ALWAYS_EXPORT void* operator new(size_t size) {
  return ShimCppNew(size);
}

SHIM_ALWAYS_EXPORT void operator delete(void* p) __THROW {
  ShimCppDelete(p);
}

SHIM_ALWAYS_EXPORT void* operator new[](size_t size) {
  return ShimCppNew(size);
}

SHIM_ALWAYS_EXPORT void operator delete[](void* p) __THROW {
  ShimCppDelete(p);
}

SHIM_ALWAYS_EXPORT void* operator new(size_t size,
                                      const std::nothrow_t&) __THROW {
  return ShimCppNew(size);
}

SHIM_ALWAYS_EXPORT void* operator new[](size_t size,
                                        const std::nothrow_t&) __THROW {
  return ShimCppNew(size);
}

SHIM_ALWAYS_EXPORT void operator delete(void* p, const std::nothrow_t&) __THROW {
  ShimCppDelete(p);
}

SHIM_ALWAYS_EXPORT void operator delete[](void* p,
                                          const std::nothrow_t&) __THROW {
  ShimCppDelete(p);
}

SHIM_ALWAYS_EXPORT void operator delete(void* p, size_t) __THROW {
  ShimCppDelete(p);
}

SHIM_ALWAYS_EXPORT void operator delete[](void* p, size_t) __THROW {
  ShimCppDelete(p);
}

ALIGN_LINKAGE SHIM_ALWAYS_EXPORT void* ALIGN_NEW(std::size_t size,
                                                 ALIGN_VAL_T alignment) {
  return ShimCppAlignedNew(size, static_cast<size_t>(alignment));
}

ALIGN_LINKAGE SHIM_ALWAYS_EXPORT void* ALIGN_NEW_NOTHROW(
    std::size_t size,
    ALIGN_VAL_T alignment,
    const std::nothrow_t&) __THROW {
  return ShimCppAlignedNew(size, static_cast<size_t>(alignment));
}

ALIGN_LINKAGE SHIM_ALWAYS_EXPORT void ALIGN_DEL(void* p, ALIGN_VAL_T) __THROW {
  ShimCppDelete(p);
}

ALIGN_LINKAGE SHIM_ALWAYS_EXPORT void ALIGN_DEL_SIZED(void* p,
                                                      std::size_t size,
                                                      ALIGN_VAL_T) __THROW {
  ShimCppDelete(p);
}

ALIGN_LINKAGE SHIM_ALWAYS_EXPORT void
ALIGN_DEL_NOTHROW(void* p, ALIGN_VAL_T, const std::nothrow_t&) __THROW {
  ShimCppDelete(p);
}

ALIGN_LINKAGE SHIM_ALWAYS_EXPORT void* ALIGN_NEW_ARR(std::size_t size,
                                                     ALIGN_VAL_T alignment) {
  return ShimCppAlignedNew(size, static_cast<size_t>(alignment));
}

ALIGN_LINKAGE SHIM_ALWAYS_EXPORT void* ALIGN_NEW_ARR_NOTHROW(
    std::size_t size,
    ALIGN_VAL_T alignment,
    const std::nothrow_t&) __THROW {
  return ShimCppAlignedNew(size, static_cast<size_t>(alignment));
}

ALIGN_LINKAGE SHIM_ALWAYS_EXPORT void ALIGN_DEL_ARR(void* p,
                                                    ALIGN_VAL_T) __THROW {
  ShimCppDelete(p);
}

ALIGN_LINKAGE SHIM_ALWAYS_EXPORT void ALIGN_DEL_ARR_SIZED(void* p,
                                                          std::size_t size,
                                                          ALIGN_VAL_T) __THROW {
  ShimCppDelete(p);
}

ALIGN_LINKAGE SHIM_ALWAYS_EXPORT void
ALIGN_DEL_ARR_NOTHROW(void* p, ALIGN_VAL_T, const std::nothrow_t&) __THROW {
  ShimCppDelete(p);
}