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diff --git a/memory/build/malloc_decls.h b/memory/build/malloc_decls.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+// Helper header to declare all the supported malloc functions.
+// MALLOC_DECL arguments are:
+//   - function name
+//   - return type
+//   - argument types
+
+#ifndef malloc_decls_h
+#  define malloc_decls_h
+
+#  include "mozjemalloc_types.h"
+
+#  define MALLOC_FUNCS_MALLOC_BASE 1
+#  define MALLOC_FUNCS_MALLOC_EXTRA 2
+#  define MALLOC_FUNCS_MALLOC \
+    (MALLOC_FUNCS_MALLOC_BASE | MALLOC_FUNCS_MALLOC_EXTRA)
+#  define MALLOC_FUNCS_JEMALLOC 4
+#  define MALLOC_FUNCS_ARENA_BASE 8
+#  define MALLOC_FUNCS_ARENA_ALLOC 16
+#  define MALLOC_FUNCS_ARENA \
+    (MALLOC_FUNCS_ARENA_BASE | MALLOC_FUNCS_ARENA_ALLOC)
+#  define MALLOC_FUNCS_ALL \
+    (MALLOC_FUNCS_MALLOC | MALLOC_FUNCS_JEMALLOC | MALLOC_FUNCS_ARENA)
+
+#endif  // malloc_decls_h
+
+#ifndef MALLOC_FUNCS
+#  define MALLOC_FUNCS MALLOC_FUNCS_ALL
+#endif
+
+#ifdef MALLOC_DECL
+// NOTHROW_MALLOC_DECL is intended for functions where the standard library
+// declares the functions in question as `throw()`.  Not all platforms
+// consistent declare certain functions as `throw()`, though.
+
+// Bionic and OS X don't seem to care about `throw()`ness.
+#  if defined(ANDROID) || defined(XP_DARWIN)
+#    undef NOTHROW_MALLOC_DECL
+#    define NOTHROW_MALLOC_DECL MALLOC_DECL
+// Some places don't care about the distinction.
+#  elif !defined(NOTHROW_MALLOC_DECL)
+#    define NOTHROW_MALLOC_DECL MALLOC_DECL
+#  endif
+
+#  if MALLOC_FUNCS & MALLOC_FUNCS_MALLOC_BASE
+MALLOC_DECL(malloc, void*, size_t)
+MALLOC_DECL(calloc, void*, size_t, size_t)
+MALLOC_DECL(realloc, void*, void*, size_t)
+NOTHROW_MALLOC_DECL(free, void, void*)
+NOTHROW_MALLOC_DECL(memalign, void*, size_t, size_t)
+#  endif
+#  if MALLOC_FUNCS & MALLOC_FUNCS_MALLOC_EXTRA
+NOTHROW_MALLOC_DECL(posix_memalign, int, void**, size_t, size_t)
+NOTHROW_MALLOC_DECL(aligned_alloc, void*, size_t, size_t)
+NOTHROW_MALLOC_DECL(valloc, void*, size_t)
+NOTHROW_MALLOC_DECL(malloc_usable_size, size_t, usable_ptr_t)
+MALLOC_DECL(malloc_good_size, size_t, size_t)
+#  endif
+
+#  if MALLOC_FUNCS & MALLOC_FUNCS_JEMALLOC
+// The 2nd argument points to an optional array exactly
+// jemalloc_stats_num_bins() long to be filled in (if non-null).
+MALLOC_DECL(jemalloc_stats_internal, void, jemalloc_stats_t*,
+            jemalloc_bin_stats_t*)
+
+// Return the size of the jemalloc_bin_stats_t array.
+MALLOC_DECL(jemalloc_stats_num_bins, size_t)
+
+// On some operating systems (Mac), we use madvise(MADV_FREE) to hand pages
+// back to the operating system.  On Mac, the operating system doesn't take
+// this memory back immediately; instead, the OS takes it back only when the
+// machine is running out of physical memory.
+//
+// This is great from the standpoint of efficiency, but it makes measuring our
+// actual RSS difficult, because pages which we've MADV_FREE'd shouldn't count
+// against our RSS.
+//
+// This function explicitly purges any MADV_FREE'd pages from physical memory,
+// causing our reported RSS match the amount of memory we're actually using.
+//
+// Note that this call is expensive in two ways.  First, it may be slow to
+// execute, because it may make a number of slow syscalls to free memory.  This
+// function holds the big jemalloc locks, so basically all threads are blocked
+// while this function runs.
+//
+// This function is also expensive in that the next time we go to access a page
+// which we've just explicitly decommitted, the operating system has to attach
+// to it a physical page!  If we hadn't run this function, the OS would have
+// less work to do.
+//
+// If MALLOC_DOUBLE_PURGE is not defined, this function does nothing.
+MALLOC_DECL(jemalloc_purge_freed_pages, void)
+
+// Free all unused dirty pages in all arenas. Calling this function will slow
+// down subsequent allocations so it is recommended to use it only when
+// memory needs to be reclaimed at all costs (see bug 805855). This function
+// provides functionality similar to mallctl("arenas.purge") in jemalloc 3.
+MALLOC_DECL(jemalloc_free_dirty_pages, void)
+
+// Opt in or out of a thread local arena (bool argument is whether to opt-in
+// (true) or out (false)).
+MALLOC_DECL(jemalloc_thread_local_arena, void, bool)
+
+// Provide information about any allocation enclosing the given address.
+MALLOC_DECL(jemalloc_ptr_info, void, const void*, jemalloc_ptr_info_t*)
+#  endif
+
+#  if MALLOC_FUNCS & MALLOC_FUNCS_ARENA_BASE
+
+// Creates a separate arena, and returns its id, valid to use with moz_arena_*
+// functions. A helper is provided in mozmemory.h that doesn't take any
+// arena_params_t: moz_create_arena.
+MALLOC_DECL(moz_create_arena_with_params, arena_id_t, arena_params_t*)
+
+// Dispose of the given arena. Subsequent uses of the arena will crash.
+// Passing an invalid id (inexistent or already disposed) to this function
+// will crash. The arena must be empty prior to calling this function.
+MALLOC_DECL(moz_dispose_arena, void, arena_id_t)
+
+// Set the default modifier for mMaxDirty. The value is the number of shifts
+// applied to the value. Positive value is handled as <<, negative >>.
+// Arenas may override the default modifier.
+MALLOC_DECL(moz_set_max_dirty_page_modifier, void, int32_t)
+
+#  endif
+
+#  if MALLOC_FUNCS & MALLOC_FUNCS_ARENA_ALLOC
+// Same as the functions without the moz_arena_ prefix, but using arenas
+// created with moz_create_arena.
+// The contract, even if not enforced at runtime in some configurations,
+// is that moz_arena_realloc and moz_arena_free will crash if the given
+// arena doesn't own the given pointer. All functions will crash if the
+// arena id is invalid.
+// Although discouraged, plain realloc and free can still be used on
+// pointers allocated with these functions. Realloc will properly keep
+// new pointers in the same arena as the original.
+MALLOC_DECL(moz_arena_malloc, void*, arena_id_t, size_t)
+MALLOC_DECL(moz_arena_calloc, void*, arena_id_t, size_t, size_t)
+MALLOC_DECL(moz_arena_realloc, void*, arena_id_t, void*, size_t)
+MALLOC_DECL(moz_arena_free, void, arena_id_t, void*)
+MALLOC_DECL(moz_arena_memalign, void*, arena_id_t, size_t, size_t)
+#  endif
+
+#endif  // MALLOC_DECL
+
+#undef NOTHROW_MALLOC_DECL
+#undef MALLOC_DECL
+#undef MALLOC_FUNCS