memory/mozalloc/mozalloc.cpp
author Masayuki Nakano <masayuki@d-toybox.com>
Fri, 29 Jul 2016 13:29:45 +0900
changeset 394879 43eb79cff14baebb79ef8bc02df57b544d876534
parent 272102 7cd4ddde77e9743035bbeeca1b71cc59f9e8e960
child 400872 f9456fc7296950bfedab37e7511de6e8518300bb
permissions -rw-r--r--
Bug 1286464 part.17 ContentEventHandler::OnQueryTextRect() should compute a line breaker's rect from the last text frame if the queried range starts with a block frame r?smaug When queried range starts with a block frame, we cannot compute proper line breaker's rect at its open tag only with the frame's rect because the proper rect should be at the end of previous text frame. Therefore, this patch makes SetRangeFromFlatTextOffset() return the last text node found at scanning the range. Then, OnQueryTextRect() can compute the first line breaker's rect with it (if there is at least one text node). However, if the last text node is hidden by CSS or something, this patch won't work. We need to do something in another bug for hidden frame's issue, though. But note that IME typically doesn't request hidden text's rect because neither selection nor composition string is in such range. MozReview-Commit-ID: 2FFzNoubJ1y

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: sw=4 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/. */

#include <stddef.h>             // for size_t

// Building with USE_STATIC_LIBS = True sets -MT instead of -MD. -MT sets _MT,
// while -MD sets _MT and _DLL.
#if defined(_MT) && !defined(_DLL)
#define MOZ_STATIC_RUNTIME
#endif

#if defined(MOZ_MEMORY) && !defined(MOZ_STATIC_RUNTIME)
// mozalloc.cpp is part of the same library as mozmemory, thus MOZ_MEMORY_IMPL
// is needed.
#define MOZ_MEMORY_IMPL
#include "mozmemory_wrap.h"

#if defined(XP_DARWIN)
#include <malloc/malloc.h> // for malloc_size
#endif

// See mozmemory_wrap.h for more details. This file is part of libmozglue, so
// it needs to use _impl suffixes. However, with libmozglue growing, this is
// becoming cumbersome, so we will likely use a malloc.h wrapper of some sort
// and allow the use of the functions without a _impl suffix.
#define MALLOC_DECL(name, return_type, ...) \
  extern "C" MOZ_MEMORY_API return_type name ## _impl(__VA_ARGS__);
#define MALLOC_FUNS MALLOC_FUNCS_MALLOC
#include "malloc_decls.h"

extern "C" MOZ_MEMORY_API char *strdup_impl(const char *);
extern "C" MOZ_MEMORY_API char *strndup_impl(const char *, size_t);

#else
// When jemalloc is disabled, or when building the static runtime variant,
// we need not to use the suffixes.

#if defined(MALLOC_H)
#  include MALLOC_H             // for memalign, valloc, malloc_size, malloc_us
#endif // if defined(MALLOC_H)
#include <stdlib.h>             // for malloc, free
#if defined(XP_UNIX)
#  include <unistd.h>           // for valloc on *BSD
#endif //if defined(XP_UNIX)

#define malloc_impl malloc
#define posix_memalign_impl posix_memalign
#define calloc_impl calloc
#define realloc_impl realloc
#define free_impl free
#define memalign_impl memalign
#define valloc_impl valloc
#define malloc_usable_size_impl malloc_usable_size
#define strdup_impl strdup
#define strndup_impl strndup

#endif

#include <errno.h>
#include <new>                  // for std::bad_alloc
#include <string.h>

#include <sys/types.h>

#include "mozilla/mozalloc.h"
#include "mozilla/mozalloc_oom.h"  // for mozalloc_handle_oom

#ifdef __GNUC__
#define LIKELY(x)    (__builtin_expect(!!(x), 1))
#define UNLIKELY(x)  (__builtin_expect(!!(x), 0))
#else
#define LIKELY(x)    (x)
#define UNLIKELY(x)  (x)
#endif

void*
moz_xmalloc(size_t size)
{
    void* ptr = malloc_impl(size);
    if (UNLIKELY(!ptr && size)) {
        mozalloc_handle_oom(size);
        return moz_xmalloc(size);
    }
    return ptr;
}

void*
moz_xcalloc(size_t nmemb, size_t size)
{
    void* ptr = calloc_impl(nmemb, size);
    if (UNLIKELY(!ptr && nmemb && size)) {
        mozalloc_handle_oom(size);
        return moz_xcalloc(nmemb, size);
    }
    return ptr;
}

void*
moz_xrealloc(void* ptr, size_t size)
{
    void* newptr = realloc_impl(ptr, size);
    if (UNLIKELY(!newptr && size)) {
        mozalloc_handle_oom(size);
        return moz_xrealloc(ptr, size);
    }
    return newptr;
}

char*
moz_xstrdup(const char* str)
{
    char* dup = strdup_impl(str);
    if (UNLIKELY(!dup)) {
        mozalloc_handle_oom(0);
        return moz_xstrdup(str);
    }
    return dup;
}

#if defined(HAVE_STRNDUP)
char*
moz_xstrndup(const char* str, size_t strsize)
{
    char* dup = strndup_impl(str, strsize);
    if (UNLIKELY(!dup)) {
        mozalloc_handle_oom(strsize);
        return moz_xstrndup(str, strsize);
    }
    return dup;
}
#endif  // if defined(HAVE_STRNDUP)

#if defined(HAVE_POSIX_MEMALIGN)
int
moz_xposix_memalign(void **ptr, size_t alignment, size_t size)
{
    int err = posix_memalign_impl(ptr, alignment, size);
    if (UNLIKELY(err && ENOMEM == err)) {
        mozalloc_handle_oom(size);
        return moz_xposix_memalign(ptr, alignment, size);
    }
    // else: (0 == err) or (EINVAL == err)
    return err;
}
int
moz_posix_memalign(void **ptr, size_t alignment, size_t size)
{
    int code = posix_memalign_impl(ptr, alignment, size);
    if (code)
        return code;

#if defined(XP_DARWIN)
    // Workaround faulty OSX posix_memalign, which provides memory with the
    // incorrect alignment sometimes, but returns 0 as if nothing was wrong.
    size_t mask = alignment - 1;
    if (((size_t)(*ptr) & mask) != 0) {
        void* old = *ptr;
        code = moz_posix_memalign(ptr, alignment, size);
        free(old);
    }
#endif

    return code;

}
#endif // if defined(HAVE_POSIX_MEMALIGN)

#if defined(HAVE_MEMALIGN)
void*
moz_xmemalign(size_t boundary, size_t size)
{
    void* ptr = memalign_impl(boundary, size);
    if (UNLIKELY(!ptr && EINVAL != errno)) {
        mozalloc_handle_oom(size);
        return moz_xmemalign(boundary, size);
    }
    // non-NULL ptr or errno == EINVAL
    return ptr;
}
#endif // if defined(HAVE_MEMALIGN)

#if defined(HAVE_VALLOC)
void*
moz_xvalloc(size_t size)
{
    void* ptr = valloc_impl(size);
    if (UNLIKELY(!ptr)) {
        mozalloc_handle_oom(size);
        return moz_xvalloc(size);
    }
    return ptr;
}
#endif // if defined(HAVE_VALLOC)

#ifndef MOZ_STATIC_RUNTIME
size_t
moz_malloc_usable_size(void *ptr)
{
    if (!ptr)
        return 0;

#if defined(XP_DARWIN)
    return malloc_size(ptr);
#elif defined(HAVE_MALLOC_USABLE_SIZE) || defined(MOZ_MEMORY)
    return malloc_usable_size_impl(ptr);
#elif defined(XP_WIN)
    return _msize(ptr);
#else
    return 0;
#endif
}

size_t moz_malloc_size_of(const void *ptr)
{
    return moz_malloc_usable_size((void *)ptr);
}
#endif