diff -r 000000000000 -r 6474c204b198 memory/build/replace_malloc.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/memory/build/replace_malloc.c	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,505 @@
+/* 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 MOZ_MEMORY
+#  error Should not compile this file when MOZ_MEMORY is not set
+#endif
+
+#ifndef MOZ_REPLACE_MALLOC
+#  error Should not compile this file when replace-malloc is disabled
+#endif
+
+#ifdef MOZ_NATIVE_JEMALLOC
+#  error Should not compile this file when we want to use native jemalloc
+#endif
+
+#include "mozmemory_wrap.h"
+
+/* Declare all je_* functions */
+#define MALLOC_DECL(name, return_type, ...) \
+  return_type je_ ## name(__VA_ARGS__);
+#include "malloc_decls.h"
+
+#include "mozilla/Likely.h"
+/*
+ * Windows doesn't come with weak imports as they are possible with
+ * LD_PRELOAD or DYLD_INSERT_LIBRARIES on Linux/OSX. On this platform,
+ * the replacement functions are defined as variable pointers to the
+ * function resolved with GetProcAddress() instead of weak definitions
+ * of functions. On Android, the same needs to happen as well, because
+ * the Android linker doesn't handle weak linking with non LD_PRELOADed
+ * libraries, but LD_PRELOADing is not very convenient on Android, with
+ * the zygote.
+ */
+#ifdef XP_DARWIN
+#  define MOZ_REPLACE_WEAK __attribute__((weak_import))
+#elif defined(XP_WIN) || defined(MOZ_WIDGET_ANDROID)
+#  define MOZ_NO_REPLACE_FUNC_DECL
+#elif defined(__GNUC__)
+#  define MOZ_REPLACE_WEAK __attribute__((weak))
+#endif
+
+#include "replace_malloc.h"
+
+#define MALLOC_DECL(name, return_type, ...) \
+    je_ ## name,
+
+static const malloc_table_t malloc_table = {
+#include "malloc_decls.h"
+};
+
+#ifdef MOZ_NO_REPLACE_FUNC_DECL
+#  define MALLOC_DECL(name, return_type, ...) \
+    typedef return_type (replace_ ## name ## _impl_t)(__VA_ARGS__); \
+    replace_ ## name ## _impl_t *replace_ ## name = NULL;
+#  define MALLOC_FUNCS MALLOC_FUNCS_ALL
+#  include "malloc_decls.h"
+
+#  ifdef XP_WIN
+#    include <windows.h>
+static void
+replace_malloc_init_funcs()
+{
+  char replace_malloc_lib[1024];
+  if (GetEnvironmentVariableA("MOZ_REPLACE_MALLOC_LIB", (LPSTR)&replace_malloc_lib,
+                              sizeof(replace_malloc_lib)) > 0) {
+    HMODULE handle = LoadLibraryA(replace_malloc_lib);
+    if (handle) {
+#define MALLOC_DECL(name, ...) \
+  replace_ ## name = (replace_ ## name ## _impl_t *) GetProcAddress(handle, "replace_" # name);
+
+#  define MALLOC_FUNCS MALLOC_FUNCS_ALL
+#include "malloc_decls.h"
+    }
+  }
+}
+#  elif defined(MOZ_WIDGET_ANDROID)
+#    include <dlfcn.h>
+static void
+replace_malloc_init_funcs()
+{
+  char *replace_malloc_lib = getenv("MOZ_REPLACE_MALLOC_LIB");
+  if (replace_malloc_lib && *replace_malloc_lib) {
+    void *handle = dlopen(replace_malloc_lib, RTLD_LAZY);
+    if (handle) {
+#define MALLOC_DECL(name, ...) \
+  replace_ ## name = (replace_ ## name ## _impl_t *) dlsym(handle, "replace_" # name);
+
+#  define MALLOC_FUNCS MALLOC_FUNCS_ALL
+#include "malloc_decls.h"
+    }
+  }
+}
+#  else
+#    error No implementation for replace_malloc_init_funcs()
+#  endif
+
+#endif /* MOZ_NO_REPLACE_FUNC_DECL */
+
+/*
+ * Below is the malloc implementation overriding jemalloc and calling the
+ * replacement functions if they exist.
+ */
+
+/*
+ * On OSX, MOZ_MEMORY_API is defined to nothing, because malloc functions
+ * are meant to have hidden visibility. But since the functions are only
+ * used locally in the zone allocator further below, we can allow the
+ * compiler to optimize more by switching to static.
+ */
+#ifdef XP_DARWIN
+#undef MOZ_MEMORY_API
+#define MOZ_MEMORY_API static
+#endif
+
+/*
+ * Malloc implementation functions are MOZ_MEMORY_API, and jemalloc
+ * specific functions MOZ_JEMALLOC_API; see mozmemory_wrap.h
+ */
+#define MALLOC_DECL(name, return_type, ...) \
+  MOZ_MEMORY_API return_type name ## _impl(__VA_ARGS__);
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC
+#include "malloc_decls.h"
+
+#define MALLOC_DECL(name, return_type, ...) \
+  MOZ_JEMALLOC_API return_type name ## _impl(__VA_ARGS__);
+#define MALLOC_FUNCS MALLOC_FUNCS_JEMALLOC
+#include "malloc_decls.h"
+
+static int replace_malloc_initialized = 0;
+static void
+init()
+{
+#ifdef MOZ_NO_REPLACE_FUNC_DECL
+  replace_malloc_init_funcs();
+#endif
+  // Set this *before* calling replace_init, otherwise if replace_init calls
+  // malloc() we'll get an infinite loop.
+  replace_malloc_initialized = 1;
+  if (replace_init)
+    replace_init(&malloc_table);
+}
+
+void*
+malloc_impl(size_t size)
+{
+  if (MOZ_UNLIKELY(!replace_malloc_initialized))
+    init();
+  if (MOZ_LIKELY(!replace_malloc))
+    return je_malloc(size);
+  return replace_malloc(size);
+}
+
+int
+posix_memalign_impl(void **memptr, size_t alignment, size_t size)
+{
+  if (MOZ_UNLIKELY(!replace_malloc_initialized))
+    init();
+  if (MOZ_LIKELY(!replace_posix_memalign))
+    return je_posix_memalign(memptr, alignment, size);
+  return replace_posix_memalign(memptr, alignment, size);
+}
+
+void*
+aligned_alloc_impl(size_t alignment, size_t size)
+{
+  if (MOZ_UNLIKELY(!replace_malloc_initialized))
+    init();
+  if (MOZ_LIKELY(!replace_aligned_alloc))
+    return je_aligned_alloc(alignment, size);
+  return replace_aligned_alloc(alignment, size);
+}
+
+void*
+calloc_impl(size_t num, size_t size)
+{
+  if (MOZ_UNLIKELY(!replace_malloc_initialized))
+    init();
+  if (MOZ_LIKELY(!replace_calloc))
+    return je_calloc(num, size);
+  return replace_calloc(num, size);
+}
+
+void*
+realloc_impl(void *ptr, size_t size)
+{
+  if (MOZ_UNLIKELY(!replace_malloc_initialized))
+    init();
+  if (MOZ_LIKELY(!replace_realloc))
+    return je_realloc(ptr, size);
+  return replace_realloc(ptr, size);
+}
+
+void
+free_impl(void *ptr)
+{
+  if (MOZ_UNLIKELY(!replace_malloc_initialized))
+    init();
+  if (MOZ_LIKELY(!replace_free))
+    je_free(ptr);
+  else
+    replace_free(ptr);
+}
+
+void*
+memalign_impl(size_t alignment, size_t size)
+{
+  if (MOZ_UNLIKELY(!replace_malloc_initialized))
+    init();
+  if (MOZ_LIKELY(!replace_memalign))
+    return je_memalign(alignment, size);
+  return replace_memalign(alignment, size);
+}
+
+void*
+valloc_impl(size_t size)
+{
+  if (MOZ_UNLIKELY(!replace_malloc_initialized))
+    init();
+  if (MOZ_LIKELY(!replace_valloc))
+    return je_valloc(size);
+  return replace_valloc(size);
+}
+
+size_t
+malloc_usable_size_impl(usable_ptr_t ptr)
+{
+  if (MOZ_UNLIKELY(!replace_malloc_initialized))
+    init();
+  if (MOZ_LIKELY(!replace_malloc_usable_size))
+    return je_malloc_usable_size(ptr);
+  return replace_malloc_usable_size(ptr);
+}
+
+size_t
+malloc_good_size_impl(size_t size)
+{
+  if (MOZ_UNLIKELY(!replace_malloc_initialized))
+    init();
+  if (MOZ_LIKELY(!replace_malloc_good_size))
+    return je_malloc_good_size(size);
+  return replace_malloc_good_size(size);
+}
+
+void
+jemalloc_stats_impl(jemalloc_stats_t *stats)
+{
+  if (MOZ_UNLIKELY(!replace_malloc_initialized))
+    init();
+  if (MOZ_LIKELY(!replace_jemalloc_stats))
+    je_jemalloc_stats(stats);
+  else
+    replace_jemalloc_stats(stats);
+}
+
+void
+jemalloc_purge_freed_pages_impl()
+{
+  if (MOZ_UNLIKELY(!replace_malloc_initialized))
+    init();
+  if (MOZ_LIKELY(!replace_jemalloc_purge_freed_pages))
+    je_jemalloc_purge_freed_pages();
+  else
+    replace_jemalloc_purge_freed_pages();
+}
+
+void
+jemalloc_free_dirty_pages_impl()
+{
+  if (MOZ_UNLIKELY(!replace_malloc_initialized))
+    init();
+  if (MOZ_LIKELY(!replace_jemalloc_free_dirty_pages))
+    je_jemalloc_free_dirty_pages();
+  else
+    replace_jemalloc_free_dirty_pages();
+}
+
+/* The following comment and definitions are from jemalloc.c: */
+#if defined(__GLIBC__) && !defined(__UCLIBC__)
+
+/*
+ * glibc provides the RTLD_DEEPBIND flag for dlopen which can make it possible
+ * to inconsistently reference libc's malloc(3)-compatible functions
+ * (https://bugzilla.mozilla.org/show_bug.cgi?id=493541).
+ *
+ * These definitions interpose hooks in glibc.  The functions are actually
+ * passed an extra argument for the caller return address, which will be
+ * ignored.
+ */
+
+typedef void (* __free_hook_type)(void *ptr);
+typedef void *(* __malloc_hook_type)(size_t size);
+typedef void *(* __realloc_hook_type)(void *ptr, size_t size);
+typedef void *(* __memalign_hook_type)(size_t alignment, size_t size);
+
+MOZ_MEMORY_API __free_hook_type __free_hook = free_impl;
+MOZ_MEMORY_API __malloc_hook_type __malloc_hook = malloc_impl;
+MOZ_MEMORY_API __realloc_hook_type __realloc_hook = realloc_impl;
+MOZ_MEMORY_API __memalign_hook_type __memalign_hook = memalign_impl;
+
+#endif
+
+/*
+ * The following is a OSX zone allocator implementation.
+ * /!\ WARNING. It assumes the underlying malloc implementation's
+ * malloc_usable_size returns 0 when the given pointer is not owned by
+ * the allocator. Sadly, OSX does call zone_size with pointers not
+ * owned by the allocator.
+ */
+
+#ifdef XP_DARWIN
+#include <stdlib.h>
+#include <malloc/malloc.h>
+#include "mozilla/Assertions.h"
+
+static size_t
+zone_size(malloc_zone_t *zone, void *ptr)
+{
+  return malloc_usable_size_impl(ptr);
+}
+
+static void *
+zone_malloc(malloc_zone_t *zone, size_t size)
+{
+  return malloc_impl(size);
+}
+
+static void *
+zone_calloc(malloc_zone_t *zone, size_t num, size_t size)
+{
+  return calloc_impl(num, size);
+}
+
+static void *
+zone_realloc(malloc_zone_t *zone, void *ptr, size_t size)
+{
+  if (malloc_usable_size_impl(ptr))
+    return realloc_impl(ptr, size);
+  return realloc(ptr, size);
+}
+
+static void
+zone_free(malloc_zone_t *zone, void *ptr)
+{
+  if (malloc_usable_size_impl(ptr)) {
+    free_impl(ptr);
+    return;
+  }
+  free(ptr);
+}
+
+static void
+zone_free_definite_size(malloc_zone_t *zone, void *ptr, size_t size)
+{
+  size_t current_size = malloc_usable_size_impl(ptr);
+  if (current_size) {
+    MOZ_ASSERT(current_size == size);
+    free_impl(ptr);
+    return;
+  }
+  free(ptr);
+}
+
+static void *
+zone_memalign(malloc_zone_t *zone, size_t alignment, size_t size)
+{
+  void *ptr;
+  if (posix_memalign_impl(&ptr, alignment, size) == 0)
+    return ptr;
+  return NULL;
+}
+
+static void *
+zone_valloc(malloc_zone_t *zone, size_t size)
+{
+  return valloc_impl(size);
+}
+
+static void *
+zone_destroy(malloc_zone_t *zone)
+{
+  /* This function should never be called. */
+  MOZ_CRASH();
+}
+
+static size_t
+zone_good_size(malloc_zone_t *zone, size_t size)
+{
+  return malloc_good_size_impl(size);
+}
+
+#ifdef MOZ_JEMALLOC
+
+#include "jemalloc/internal/jemalloc_internal.h"
+
+static void
+zone_force_lock(malloc_zone_t *zone)
+{
+  /* /!\ This calls into jemalloc. It works because we're linked in the
+   * same library. Stolen from jemalloc's zone.c. */
+  if (isthreaded)
+    jemalloc_prefork();
+}
+
+static void
+zone_force_unlock(malloc_zone_t *zone)
+{
+  /* /!\ This calls into jemalloc. It works because we're linked in the
+   * same library. Stolen from jemalloc's zone.c. */
+  if (isthreaded)
+    jemalloc_postfork_parent();
+}
+
+#else
+
+#define JEMALLOC_ZONE_VERSION 6
+
+/* Empty implementations are needed, because fork() calls zone->force_(un)lock
+ * unconditionally. */
+static void
+zone_force_lock(malloc_zone_t *zone)
+{
+}
+
+static void
+zone_force_unlock(malloc_zone_t *zone)
+{
+}
+
+#endif
+
+static malloc_zone_t zone;
+static struct malloc_introspection_t zone_introspect;
+
+__attribute__((constructor)) void
+register_zone(void)
+{
+  zone.size = (void *)zone_size;
+  zone.malloc = (void *)zone_malloc;
+  zone.calloc = (void *)zone_calloc;
+  zone.valloc = (void *)zone_valloc;
+  zone.free = (void *)zone_free;
+  zone.realloc = (void *)zone_realloc;
+  zone.destroy = (void *)zone_destroy;
+  zone.zone_name = "replace_malloc_zone";
+  zone.batch_malloc = NULL;
+  zone.batch_free = NULL;
+  zone.introspect = &zone_introspect;
+  zone.version = JEMALLOC_ZONE_VERSION;
+  zone.memalign = zone_memalign;
+  zone.free_definite_size = zone_free_definite_size;
+#if (JEMALLOC_ZONE_VERSION >= 8)
+  zone.pressure_relief = NULL;
+#endif
+  zone_introspect.enumerator = NULL;
+  zone_introspect.good_size = (void *)zone_good_size;
+  zone_introspect.check = NULL;
+  zone_introspect.print = NULL;
+  zone_introspect.log = NULL;
+  zone_introspect.force_lock = (void *)zone_force_lock;
+  zone_introspect.force_unlock = (void *)zone_force_unlock;
+  zone_introspect.statistics = NULL;
+  zone_introspect.zone_locked = NULL;
+#if (JEMALLOC_ZONE_VERSION >= 7)
+  zone_introspect.enable_discharge_checking = NULL;
+  zone_introspect.disable_discharge_checking = NULL;
+  zone_introspect.discharge = NULL;
+#ifdef __BLOCKS__
+  zone_introspect.enumerate_discharged_pointers = NULL;
+#else
+  zone_introspect.enumerate_unavailable_without_blocks = NULL;
+#endif
+#endif
+
+  /*
+   * The default purgeable zone is created lazily by OSX's libc.  It uses
+   * the default zone when it is created for "small" allocations
+   * (< 15 KiB), but assumes the default zone is a scalable_zone.  This
+   * obviously fails when the default zone is the jemalloc zone, so
+   * malloc_default_purgeable_zone is called beforehand so that the
+   * default purgeable zone is created when the default zone is still
+   * a scalable_zone.  As purgeable zones only exist on >= 10.6, we need
+   * to check for the existence of malloc_default_purgeable_zone() at
+   * run time.
+   */
+  malloc_default_purgeable_zone();
+
+  /* Register the custom zone.  At this point it won't be the default. */
+  malloc_zone_register(&zone);
+
+  /*
+   * Unregister and reregister the default zone.  On OSX >= 10.6,
+   * unregistering takes the last registered zone and places it at the
+   * location of the specified zone.  Unregistering the default zone thus
+   * makes the last registered one the default.  On OSX < 10.6,
+   * unregistering shifts all registered zones.  The first registered zone
+   * then becomes the default.
+   */
+  do {
+    malloc_zone_t *default_zone = malloc_default_zone();
+    malloc_zone_unregister(default_zone);
+    malloc_zone_register(default_zone);
+  } while (malloc_default_zone() != &zone);
+}
+#endif