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products/sources/formale Sprachen/C/Firefox/memory/mozalloc/ (Browser von der Mozilla Stiftung Version 136.0.1^©) Datei vom 10.2.2025 mit Größe 6 kB

Quelle mozalloc.h Sprache: C

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=4 et :
*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_mozalloc_h
#define mozilla_mozalloc_h

/*
* https://bugzilla.mozilla.org/show_bug.cgi?id=427099
*/

#if defined(__cplusplus)
#  include <new>
// Since libstdc++ 6, including the C headers (e.g. stdlib.h) instead of the
// corresponding C++ header (e.g. cstdlib) can cause confusion in C++ code
// using things defined there. Specifically, with stdlib.h, the use of abs()
// in gfx/graphite2/src/inc/UtfCodec.h somehow ends up picking the wrong abs()
#  include <cstdlib>
#else
#  include <stdlib.h>
#endif

#if defined(MOZ_MEMORY) && defined(IMPL_MFBT)
#  define MOZ_MEMORY_IMPL
#  include "mozmemory_wrap.h"
#  define MALLOC_FUNCS MALLOC_FUNCS_MALLOC
// See mozmemory_wrap.h for more details. Files that are part of libmozglue,
// need to use _impl suffixes, which is becoming cumbersome. We'll have to use
// something like a malloc.h wrapper and allow the use of the functions without
// a _impl suffix. In the meanwhile, this is enough to get by for C++ code.
#  define NOTHROW_MALLOC_DECL(name, return_type, ...) \
    MOZ_MEMORY_API return_type name##_impl(__VA_ARGS__) noexcept(true);
#  define MALLOC_DECL(name, return_type, ...) \
    MOZ_MEMORY_API return_type name##_impl(__VA_ARGS__);
#  include "malloc_decls.h"
#endif

#if defined(__cplusplus)
#  include "mozilla/fallible.h"
#  include "mozilla/mozalloc_abort.h"
#  include "mozilla/TemplateLib.h"
#endif
#include "mozilla/Attributes.h"
#include "mozilla/Types.h"

MOZ_BEGIN_EXTERN_C

/*
* We need to use malloc_impl and free_impl in this file when they are
* defined, because of how mozglue.dll is linked on Windows, where using
* malloc/free would end up using the symbols from the MSVCRT instead of
* ours.
*/
#ifndef free_impl
#  define free_impl free
#  define free_impl_
#endif
#ifndef malloc_impl
#  define malloc_impl malloc
#  define malloc_impl_
#endif

/*
* Each declaration below is analogous to a "standard" allocation
* function, except that the out-of-memory handling is made explicit.
* The |moz_x| versions will never return a NULL pointer; if memory
* is exhausted, they abort.  The |moz_| versions may return NULL
* pointers if memory is exhausted: their return value must be checked.
*
* All these allocation functions are *guaranteed* to return a pointer
* to memory allocated in such a way that that memory can be freed by
* passing that pointer to |free()|.
*/

MFBT_API void* moz_xmalloc(size_t size) MOZ_INFALLIBLE_ALLOCATOR;

MFBT_API void* moz_xcalloc(size_t nmemb, size_t size) MOZ_INFALLIBLE_ALLOCATOR;

MFBT_API void* moz_xrealloc(void* ptr, size_t size) MOZ_INFALLIBLE_ALLOCATOR;

MFBT_API char* moz_xstrdup(const char* str) MOZ_INFALLIBLE_ALLOCATOR;

#if defined(HAVE_STRNDUP)
MFBT_API char* moz_xstrndup(const char* str,
                            size_t strsize) MOZ_INFALLIBLE_ALLOCATOR;
#endif /* if defined(HAVE_STRNDUP) */

MFBT_API void* moz_xmemdup(const void* ptr,
                           size_t size) MOZ_INFALLIBLE_ALLOCATOR;

MFBT_API void* moz_xmemalign(size_t boundary,
                             size_t size) MOZ_INFALLIBLE_ALLOCATOR;

MFBT_API size_t moz_malloc_usable_size(void* ptr);

MFBT_API size_t moz_malloc_size_of(const void* ptr);

/*
* Like moz_malloc_size_of(), but works reliably with interior pointers, i.e.
* pointers into the middle of a live allocation.
*/
MFBT_API size_t moz_malloc_enclosing_size_of(const void* ptr);

MOZ_END_EXTERN_C

#ifdef __cplusplus

/* NB: This is defined with MFBT_API just to silence vacuous warnings
* about symbol visibility on OS X/gcc.
* These symbols are force-inline mainly for performance reasons, and
* not exported. While the standard doesn't allow that, we are in a
* controlled environment where the issues the standard tries to
* prevent don't apply, and we can't end up in situations where
* operator new and operator delete are inconsistent. */
#  ifdef __clang__
#    pragma clang diagnostic push
#    pragma clang diagnostic ignored "-Winline-new-delete"
#  endif

#  if defined(XP_MACOSX)
#    define MOZALLOC_EXPORT_NEW MFBT_API MOZ_ALWAYS_INLINE_EVEN_DEBUG
#  else
#    define MOZALLOC_EXPORT_NEW MOZ_ALWAYS_INLINE_EVEN_DEBUG
#  endif

#  include "mozilla/cxxalloc.h"
#  ifdef __clang__
#    pragma clang diagnostic pop
#  endif

/*
* This policy is identical to MallocAllocPolicy, except it uses
* moz_xmalloc/moz_xcalloc/moz_xrealloc instead of
* malloc/calloc/realloc.
*/
class InfallibleAllocPolicy {
public:
  template <typename T>
  T* maybe_pod_malloc(size_t aNumElems) {
    return pod_malloc<T>(aNumElems);
  }

  template <typename T>
  T* maybe_pod_calloc(size_t aNumElems) {
    return pod_calloc<T>(aNumElems);
  }

  template <typename T>
  T* maybe_pod_realloc(T* aPtr, size_t aOldSize, size_t aNewSize) {
    return pod_realloc<T>(aPtr, aOldSize, aNewSize);
  }

  template <typename T>
  T* pod_malloc(size_t aNumElems) {
    if (aNumElems & mozilla::tl::MulOverflowMask<sizeof(T)>::value) {
      reportAllocOverflow();
    }
    return static_cast<T*>(moz_xmalloc(aNumElems * sizeof(T)));
  }

  template <typename T>
  T* pod_calloc(size_t aNumElems) {
    return static_cast<T*>(moz_xcalloc(aNumElems, sizeof(T)));
  }

  template <typename T>
  T* pod_realloc(T* aPtr, size_t aOldSize, size_t aNewSize) {
    if (aNewSize & mozilla::tl::MulOverflowMask<sizeof(T)>::value) {
      reportAllocOverflow();
    }
    return static_cast<T*>(moz_xrealloc(aPtr, aNewSize * sizeof(T)));
  }

  template <typename T>
  void free_(T* aPtr, size_t aNumElems = 0) {
    free_impl(aPtr);
  }

  void reportAllocOverflow() const { mozalloc_abort("alloc overflow"); }

  bool checkSimulatedOOM() const { return true; }
};

#endif /* ifdef __cplusplus */

#ifdef malloc_impl_
#  undef malloc_impl_
#  undef malloc_impl
#endif
#ifdef free_impl_
#  undef free_impl_
#  undef free_impl
#endif

#endif /* ifndef mozilla_mozalloc_h */

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