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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
commit | 43a97878ce14b72f0981164f87f2e35e14151312 (patch) | |
tree | 620249daf56c0258faa40cbdcf9cfba06de2a846 /memory/mozalloc/mozalloc.h | |
parent | Initial commit. (diff) | |
download | firefox-43a97878ce14b72f0981164f87f2e35e14151312.tar.xz firefox-43a97878ce14b72f0981164f87f2e35e14151312.zip |
Adding upstream version 110.0.1.upstream/110.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'memory/mozalloc/mozalloc.h')
-rw-r--r-- | memory/mozalloc/mozalloc.h | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/memory/mozalloc/mozalloc.h b/memory/mozalloc/mozalloc.h new file mode 100644 index 0000000000..549f92eded --- /dev/null +++ b/memory/mozalloc/mozalloc.h @@ -0,0 +1,186 @@ +/* -*- 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 just to silence vacuous warnings about symbol + * visibility on OS X/gcc. These symbols are force-inline and not + * exported. */ +# 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" + +/* + * 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 */ |