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e8aa5ac59c
Bug 818922 made MOZ_REPLACE_MALLOC a global define, and that changed the defines set when building mozjemalloc_compat.c for the jemalloc3 replace-malloc library. In turn, this made the symbol munging wrong for that library, making the jemalloc_* functions exported as je_jemalloc_* instead of replace_jemalloc_*.
220 lines
8.1 KiB
C
220 lines
8.1 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozmemory_wrap_h
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#define mozmemory_wrap_h
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/*
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* This header contains #defines which tweak the names of various memory
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* allocation functions.
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*
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* There are several types of functions related to memory allocation
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* that are meant to be used publicly by the Gecko codebase:
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*
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* - malloc implementation functions:
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* - malloc
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* - posix_memalign
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* - aligned_alloc
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* - calloc
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* - realloc
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* - free
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* - memalign
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* - valloc
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* - malloc_usable_size
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* - malloc_good_size
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* Some of these functions are specific to some systems, but for
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* convenience, they are treated as being cross-platform, and available
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* as such.
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*
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* - duplication functions:
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* - strndup
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* - strdup
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* - wcsdup (Windows only)
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*
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* - jemalloc specific functions:
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* - jemalloc_stats
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* - jemalloc_purge_freed_pages
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* - jemalloc_free_dirty_pages
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* (these functions are native to mozjemalloc, and have compatibility
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* implementations for jemalloc3)
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*
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* These functions are all exported as part of libmozglue (see
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* $(topsrcdir)/mozglue/build/Makefile.in), with a few implementation
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* peculiarities:
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*
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* - On Windows, the malloc implementation functions are all prefixed with
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* "je_", the duplication functions are prefixed with "wrap_", and jemalloc
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* specific functions are left unprefixed. All these functions are however
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* aliased when exporting them, such that the resulting mozglue.dll exports
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* them unprefixed (see $(topsrcdir)/mozglue/build/mozglue.def.in). The
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* prefixed malloc implementation and duplication functions are not
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* exported.
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*
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* - On MacOSX, the system libc has a zone allocator, which allows us to
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* hook custom malloc implementation functions without exporting them.
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* The malloc implementation functions are all prefixed with "je_" and used
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* this way from the custom zone allocator. They are not exported.
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* Duplication functions are not included, since they will call the custom
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* zone allocator anyways. Jemalloc-specific functions are also left
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* unprefixed.
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*
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* - On Android and Gonk, all functions are left unprefixed. Additionally,
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* C++ allocation functions (operator new/delete) are also exported and
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* unprefixed.
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*
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* - On other systems (mostly Linux), all functions are left unprefixed.
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*
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* Only Android and Gonk add C++ allocation functions.
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*
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* Proper exporting of the various functions is done with the MOZ_MEMORY_API
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* and MOZ_JEMALLOC_API macros. MOZ_MEMORY_API is meant to be used for malloc
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* implementation and duplication functions, while MOZ_JEMALLOC_API is
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* dedicated to jemalloc specific functions.
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*
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*
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* All these functions are meant to be called with no prefix from Gecko code.
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* In most cases, this is because that's how they are available at runtime.
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* However, on Android, this relies on faulty.lib (the custom dynamic linker)
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* resolving mozglue symbols before libc symbols, which is guaranteed by the
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* way faulty.lib works (it respects the DT_NEEDED order, and libc always
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* appears after mozglue ; which we double check when building anyways)
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*
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*
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* Within libmozglue (when MOZ_MEMORY_IMPL is defined), all the functions
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* should be suffixed with "_impl" both for declarations and use.
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* That is, the implementation declaration for e.g. strdup would look like:
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* char* strdup_impl(const char *)
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* That implementation would call malloc by using "malloc_impl".
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*
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* While mozjemalloc uses these "_impl" suffixed helpers, jemalloc3, being
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* third-party code, doesn't, but instead has an elaborate way to mangle
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* individual functions. See under "Run jemalloc configure script" in
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* $(topsrcdir)/configure.in.
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*
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*
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* When building with replace-malloc support, the above still holds, but
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* the malloc implementation and jemalloc specific functions are the
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* replace-malloc functions from replace_malloc.c.
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*
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* The actual jemalloc/mozjemalloc implementation is prefixed with "je_".
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*
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* Thus, when MOZ_REPLACE_MALLOC is defined, the "_impl" suffixed macros
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* expand to "je_" prefixed function when building mozjemalloc or
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* jemalloc3/mozjemalloc_compat, where MOZ_JEMALLOC_IMPL is defined.
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*
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* In other cases, the "_impl" suffixed macros follow the original scheme,
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* except on Windows and MacOSX, where they would expand to "je_" prefixed
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* functions. Instead, they are left unmodified (malloc_impl expands to
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* malloc_impl).
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*/
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#ifndef MOZ_MEMORY
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# error Should only include mozmemory_wrap.h when MOZ_MEMORY is set.
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#endif
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#if defined(MOZ_JEMALLOC_IMPL) && !defined(MOZ_MEMORY_IMPL)
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# define MOZ_MEMORY_IMPL
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#endif
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#if defined(MOZ_MEMORY_IMPL) && !defined(IMPL_MFBT)
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# ifdef MFBT_API /* mozilla/Types.h was already included */
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# error mozmemory_wrap.h has to be included before mozilla/Types.h when MOZ_MEMORY_IMPL is set and IMPL_MFBT is not.
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# endif
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# define IMPL_MFBT
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#endif
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#include "mozilla/Types.h"
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#if !defined(MOZ_NATIVE_JEMALLOC)
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# ifdef MOZ_MEMORY_IMPL
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# if defined(MOZ_JEMALLOC_IMPL) && defined(MOZ_REPLACE_MALLOC) && !defined(MOZ_REPLACE_JEMALLOC)
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# define mozmem_malloc_impl(a) je_ ## a
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# define mozmem_jemalloc_impl(a) je_ ## a
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# else
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# define MOZ_JEMALLOC_API MFBT_API
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# ifdef MOZ_REPLACE_JEMALLOC
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# define MOZ_MEMORY_API MFBT_API
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# define mozmem_malloc_impl(a) replace_ ## a
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# define mozmem_jemalloc_impl(a) replace_ ## a
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# elif (defined(XP_WIN) || defined(XP_DARWIN))
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# if defined(MOZ_REPLACE_MALLOC)
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# define mozmem_malloc_impl(a) a ## _impl
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# else
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# define mozmem_malloc_impl(a) je_ ## a
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# endif
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# else
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# define MOZ_MEMORY_API MFBT_API
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# if defined(MOZ_WIDGET_ANDROID) || defined(MOZ_WIDGET_GONK)
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# define MOZ_WRAP_NEW_DELETE
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# endif
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# endif
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# endif
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# ifdef XP_WIN
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# define mozmem_dup_impl(a) wrap_ ## a
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# endif
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# endif
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/* All other jemalloc3 functions are prefixed with "je_", except when
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* building against an unprefixed system jemalloc library */
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# define je_(a) je_ ## a
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#else /* defined(MOZ_NATIVE_JEMALLOC) */
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# define je_(a) a
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#endif
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#if !defined(MOZ_MEMORY_IMPL) || defined(MOZ_NATIVE_JEMALLOC)
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# define MOZ_MEMORY_API MFBT_API
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# define MOZ_JEMALLOC_API MFBT_API
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#endif
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#ifndef MOZ_MEMORY_API
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# define MOZ_MEMORY_API
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#endif
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#ifndef MOZ_JEMALLOC_API
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# define MOZ_JEMALLOC_API
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#endif
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#ifndef mozmem_malloc_impl
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# define mozmem_malloc_impl(a) a
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#endif
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#ifndef mozmem_dup_impl
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# define mozmem_dup_impl(a) a
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#endif
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#ifndef mozmem_jemalloc_impl
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# define mozmem_jemalloc_impl(a) a
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#endif
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/* Malloc implementation functions */
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#define malloc_impl mozmem_malloc_impl(malloc)
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#define posix_memalign_impl mozmem_malloc_impl(posix_memalign)
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#define aligned_alloc_impl mozmem_malloc_impl(aligned_alloc)
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#define calloc_impl mozmem_malloc_impl(calloc)
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#define realloc_impl mozmem_malloc_impl(realloc)
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#define free_impl mozmem_malloc_impl(free)
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#define memalign_impl mozmem_malloc_impl(memalign)
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#define valloc_impl mozmem_malloc_impl(valloc)
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#define malloc_usable_size_impl mozmem_malloc_impl(malloc_usable_size)
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#define malloc_good_size_impl mozmem_malloc_impl(malloc_good_size)
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/* Duplication functions */
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#define strndup_impl mozmem_dup_impl(strndup)
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#define strdup_impl mozmem_dup_impl(strdup)
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#ifdef XP_WIN
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# define wcsdup_impl mozmem_dup_impl(wcsdup)
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#endif
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/* String functions */
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#ifdef ANDROID
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/* Bug 801571 and Bug 879668, libstagefright uses vasprintf, causing malloc()/
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* free() to be mismatched between bionic and mozglue implementation.
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*/
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#define vasprintf_impl mozmem_dup_impl(vasprintf)
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#define asprintf_impl mozmem_dup_impl(asprintf)
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#endif
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/* Jemalloc specific function */
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#define jemalloc_stats_impl mozmem_jemalloc_impl(jemalloc_stats)
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#define jemalloc_purge_freed_pages_impl mozmem_jemalloc_impl(jemalloc_purge_freed_pages)
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#define jemalloc_free_dirty_pages_impl mozmem_jemalloc_impl(jemalloc_free_dirty_pages)
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#endif /* mozmemory_wrap_h */
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