зеркало из https://github.com/mozilla/gecko-dev.git
481 строка
14 KiB
C++
481 строка
14 KiB
C++
/*
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* Copyright © 2007,2008,2009 Red Hat, Inc.
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* Copyright © 2011,2012 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_PRIVATE_HH
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#define HB_PRIVATE_HH
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#define _GNU_SOURCE 1
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "hb.h"
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#define HB_H_IN
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#ifdef HAVE_OT
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#include "hb-ot.h"
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#define HB_OT_H_IN
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#endif
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#include <math.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdarg.h>
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#if (defined(_MSC_VER) && _MSC_VER >= 1500) || defined(__MINGW32__)
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#include <intrin.h>
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#endif
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#define HB_PASTE1(a,b) a##b
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#define HB_PASTE(a,b) HB_PASTE1(a,b)
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/* Compile-time custom allocator support. */
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#if defined(hb_malloc_impl) \
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&& defined(hb_calloc_impl) \
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&& defined(hb_realloc_impl) \
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&& defined(hb_free_impl)
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extern "C" void* hb_malloc_impl(size_t size);
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extern "C" void* hb_calloc_impl(size_t nmemb, size_t size);
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extern "C" void* hb_realloc_impl(void *ptr, size_t size);
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extern "C" void hb_free_impl(void *ptr);
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#define malloc hb_malloc_impl
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#define calloc hb_calloc_impl
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#define realloc hb_realloc_impl
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#define free hb_free_impl
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#if defined(hb_memalign_impl)
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extern "C" int hb_memalign_impl(void **memptr, size_t alignment, size_t size);
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#define posix_memalign hb_memalign_impl
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#else
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#undef HAVE_POSIX_MEMALIGN
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#endif
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#endif
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/*
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* Compiler attributes
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*/
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#if __cplusplus < 201103L
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#ifndef nullptr
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#define nullptr NULL
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#endif
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#ifndef constexpr
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#define constexpr const
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#endif
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#ifndef static_assert
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#define static_assert(e, msg) \
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HB_UNUSED typedef int HB_PASTE(static_assertion_failed_at_line_, __LINE__) [(e) ? 1 : -1]
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#endif // static_assert
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#ifdef __GNUC__
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#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8))
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#define thread_local __thread
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#endif
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#else
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#define thread_local
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#endif
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template <typename T>
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struct _hb_alignof
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{
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struct s
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{
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char c;
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T t;
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};
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static constexpr size_t value = offsetof (s, t);
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};
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#ifndef alignof
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#define alignof(x) (_hb_alignof<x>::value)
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#endif
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/* https://github.com/harfbuzz/harfbuzz/issues/1127 */
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#ifndef explicit_operator
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#define explicit_operator
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#endif
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#else /* __cplusplus >= 201103L */
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/* https://github.com/harfbuzz/harfbuzz/issues/1127 */
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#ifndef explicit_operator
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#define explicit_operator explicit
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#endif
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#endif /* __cplusplus < 201103L */
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#if (defined(__GNUC__) || defined(__clang__)) && defined(__OPTIMIZE__)
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#define likely(expr) (__builtin_expect (!!(expr), 1))
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#define unlikely(expr) (__builtin_expect (!!(expr), 0))
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#else
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#define likely(expr) (expr)
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#define unlikely(expr) (expr)
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#endif
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#if !defined(__GNUC__) && !defined(__clang__)
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#undef __attribute__
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#define __attribute__(x)
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#endif
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#if __GNUC__ >= 3
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#define HB_PURE_FUNC __attribute__((pure))
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#define HB_CONST_FUNC __attribute__((const))
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#define HB_PRINTF_FUNC(format_idx, arg_idx) __attribute__((__format__ (__printf__, format_idx, arg_idx)))
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#else
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#define HB_PURE_FUNC
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#define HB_CONST_FUNC
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#define HB_PRINTF_FUNC(format_idx, arg_idx)
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#endif
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#if __GNUC__ >= 4
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#define HB_UNUSED __attribute__((unused))
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#elif defined(_MSC_VER) /* https://github.com/harfbuzz/harfbuzz/issues/635 */
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#define HB_UNUSED __pragma(warning(suppress: 4100 4101))
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#else
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#define HB_UNUSED
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#endif
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#ifndef HB_INTERNAL
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# if !defined(HB_NO_VISIBILITY) && !defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(_MSC_VER) && !defined(__SUNPRO_CC)
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# define HB_INTERNAL __attribute__((__visibility__("hidden")))
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# elif defined(__MINGW32__)
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/* We use -export-symbols on mingw32, since it does not support visibility
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* attribute. */
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# define HB_INTERNAL
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#else
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# define HB_INTERNAL
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# define HB_NO_VISIBILITY 1
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# endif
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#endif
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#if __GNUC__ >= 3
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#define HB_FUNC __PRETTY_FUNCTION__
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#elif defined(_MSC_VER)
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#define HB_FUNC __FUNCSIG__
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#else
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#define HB_FUNC __func__
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#endif
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#if defined(__SUNPRO_CC) && (__SUNPRO_CC < 0x5140)
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/* https://github.com/harfbuzz/harfbuzz/issues/630 */
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#define __restrict
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#endif
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/*
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* Borrowed from https://bugzilla.mozilla.org/show_bug.cgi?id=1215411
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* HB_FALLTHROUGH is an annotation to suppress compiler warnings about switch
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* cases that fall through without a break or return statement. HB_FALLTHROUGH
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* is only needed on cases that have code:
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*
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* switch (foo) {
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* case 1: // These cases have no code. No fallthrough annotations are needed.
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* case 2:
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* case 3:
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* foo = 4; // This case has code, so a fallthrough annotation is needed:
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* HB_FALLTHROUGH;
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* default:
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* return foo;
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* }
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*/
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#if defined(__clang__) && __cplusplus >= 201103L
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/* clang's fallthrough annotations are only available starting in C++11. */
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# define HB_FALLTHROUGH [[clang::fallthrough]]
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#elif __GNUC__ >= 7
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/* GNU fallthrough attribute is available from GCC7 */
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# define HB_FALLTHROUGH __attribute__((fallthrough))
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#elif defined(_MSC_VER)
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/*
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* MSVC's __fallthrough annotations are checked by /analyze (Code Analysis):
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* https://msdn.microsoft.com/en-us/library/ms235402%28VS.80%29.aspx
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*/
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# include <sal.h>
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# define HB_FALLTHROUGH __fallthrough
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#else
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# define HB_FALLTHROUGH /* FALLTHROUGH */
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#endif
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#if defined(_WIN32) || defined(__CYGWIN__)
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/* We need Windows Vista for both Uniscribe backend and for
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* MemoryBarrier. We don't support compiling on Windows XP,
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* though we run on it fine. */
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# if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0600
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# undef _WIN32_WINNT
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# endif
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# ifndef _WIN32_WINNT
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# define _WIN32_WINNT 0x0600
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# endif
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# ifndef WIN32_LEAN_AND_MEAN
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# define WIN32_LEAN_AND_MEAN 1
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# endif
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# ifndef STRICT
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# define STRICT 1
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# endif
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# if defined(_WIN32_WCE)
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/* Some things not defined on Windows CE. */
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# define vsnprintf _vsnprintf
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# define getenv(Name) nullptr
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# if _WIN32_WCE < 0x800
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# define setlocale(Category, Locale) "C"
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static int errno = 0; /* Use something better? */
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# endif
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# elif defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_PC_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP)
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# define getenv(Name) nullptr
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# endif
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# if defined(_MSC_VER) && _MSC_VER < 1900
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# define snprintf _snprintf
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# endif
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#endif
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#if HAVE_ATEXIT
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/* atexit() is only safe to be called from shared libraries on certain
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* platforms. Whitelist.
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* https://bugs.freedesktop.org/show_bug.cgi?id=82246 */
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# if defined(__linux) && defined(__GLIBC_PREREQ)
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# if __GLIBC_PREREQ(2,3)
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/* From atexit() manpage, it's safe with glibc 2.2.3 on Linux. */
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# define HB_USE_ATEXIT 1
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# endif
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# elif defined(_MSC_VER) || defined(__MINGW32__)
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/* For MSVC:
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* https://msdn.microsoft.com/en-us/library/tze57ck3.aspx
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* https://msdn.microsoft.com/en-us/library/zk17ww08.aspx
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* mingw32 headers say atexit is safe to use in shared libraries.
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*/
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# define HB_USE_ATEXIT 1
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# elif defined(__ANDROID__)
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/* This is available since Android NKD r8 or r8b:
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* https://issuetracker.google.com/code/p/android/issues/detail?id=6455
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*/
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# define HB_USE_ATEXIT 1
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# elif defined(__APPLE__)
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/* For macOS and related platforms, the atexit man page indicates
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* that it will be invoked when the library is unloaded, not only
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* at application exit.
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*/
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# define HB_USE_ATEXIT 1
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# endif
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#endif
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#ifdef HB_NO_ATEXIT
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# undef HB_USE_ATEXIT
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#endif
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#define HB_STMT_START do
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#define HB_STMT_END while (0)
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/* Static-assert as expression. */
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template <unsigned int cond> class hb_assert_constant_t;
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template <> class hb_assert_constant_t<1> {};
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#define ASSERT_STATIC_EXPR_ZERO(_cond) (0 * (unsigned int) sizeof (hb_assert_constant_t<_cond>))
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/* Lets assert int types. Saves trouble down the road. */
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static_assert ((sizeof (int8_t) == 1), "");
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static_assert ((sizeof (uint8_t) == 1), "");
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static_assert ((sizeof (int16_t) == 2), "");
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static_assert ((sizeof (uint16_t) == 2), "");
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static_assert ((sizeof (int32_t) == 4), "");
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static_assert ((sizeof (uint32_t) == 4), "");
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static_assert ((sizeof (int64_t) == 8), "");
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static_assert ((sizeof (uint64_t) == 8), "");
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static_assert ((sizeof (hb_codepoint_t) == 4), "");
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static_assert ((sizeof (hb_position_t) == 4), "");
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static_assert ((sizeof (hb_mask_t) == 4), "");
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static_assert ((sizeof (hb_var_int_t) == 4), "");
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/* We like our types POD */
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#define _ASSERT_TYPE_POD1(_line, _type) union _type_##_type##_on_line_##_line##_is_not_POD { _type instance; }
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#define _ASSERT_TYPE_POD0(_line, _type) _ASSERT_TYPE_POD1 (_line, _type)
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#define ASSERT_TYPE_POD(_type) _ASSERT_TYPE_POD0 (__LINE__, _type)
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#ifdef __GNUC__
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# define _ASSERT_INSTANCE_POD1(_line, _instance) \
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HB_STMT_START { \
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typedef __typeof__(_instance) _type_##_line; \
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_ASSERT_TYPE_POD1 (_line, _type_##_line); \
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} HB_STMT_END
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#else
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# define _ASSERT_INSTANCE_POD1(_line, _instance) typedef int _assertion_on_line_##_line##_not_tested
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#endif
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# define _ASSERT_INSTANCE_POD0(_line, _instance) _ASSERT_INSTANCE_POD1 (_line, _instance)
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# define ASSERT_INSTANCE_POD(_instance) _ASSERT_INSTANCE_POD0 (__LINE__, _instance)
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/* Check _assertion in a method environment */
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#define _ASSERT_POD1(_line) \
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HB_UNUSED inline void _static_assertion_on_line_##_line (void) const \
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{ _ASSERT_INSTANCE_POD1 (_line, *this); /* Make sure it's POD. */ }
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# define _ASSERT_POD0(_line) _ASSERT_POD1 (_line)
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# define ASSERT_POD() _ASSERT_POD0 (__LINE__)
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#define HB_DISALLOW_COPY_AND_ASSIGN(TypeName) \
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TypeName(const TypeName&); \
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void operator=(const TypeName&)
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/*
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* Compiler-assisted vectorization parameters.
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*/
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/*
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* Disable vectorization for now. To correctly use them, we should
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* use posix_memalign() to allocate in hb_vector_t. Otherwise, can
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* cause misaligned access.
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*
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* https://bugs.chromium.org/p/chromium/issues/detail?id=860184
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*/
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#if !defined(HB_VECTOR_SIZE)
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# define HB_VECTOR_SIZE 0
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#endif
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/* The `vector_size' attribute was introduced in gcc 3.1. */
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#if !defined(HB_VECTOR_SIZE)
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# if defined( __GNUC__ ) && ( __GNUC__ >= 4 )
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# define HB_VECTOR_SIZE 128
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# else
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# define HB_VECTOR_SIZE 0
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# endif
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#endif
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static_assert (0 == (HB_VECTOR_SIZE & (HB_VECTOR_SIZE - 1)), "HB_VECTOR_SIZE is not power of 2.");
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static_assert (0 == (HB_VECTOR_SIZE % 64), "HB_VECTOR_SIZE is not multiple of 64.");
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#if HB_VECTOR_SIZE
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typedef uint64_t hb_vector_size_impl_t __attribute__((vector_size (HB_VECTOR_SIZE / 8)));
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#else
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typedef uint64_t hb_vector_size_impl_t;
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#endif
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/* HB_NDEBUG disables some sanity checks that are very safe to disable and
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* should be disabled in production systems. If NDEBUG is defined, enable
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* HB_NDEBUG; but if it's desirable that normal assert()s (which are very
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* light-weight) to be enabled, then HB_DEBUG can be defined to disable
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* the costlier checks. */
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#ifdef NDEBUG
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#define HB_NDEBUG 1
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#endif
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/* Flags */
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/* Enable bitwise ops on enums marked as flags_t */
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/* To my surprise, looks like the function resolver is happy to silently cast
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* one enum to another... So this doesn't provide the type-checking that I
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* originally had in mind... :(.
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*
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* For MSVC warnings, see: https://github.com/harfbuzz/harfbuzz/pull/163
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*/
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#ifdef _MSC_VER
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# pragma warning(disable:4200)
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# pragma warning(disable:4800)
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#endif
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#define HB_MARK_AS_FLAG_T(T) \
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extern "C++" { \
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static inline T operator | (T l, T r) { return T ((unsigned) l | (unsigned) r); } \
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static inline T operator & (T l, T r) { return T ((unsigned) l & (unsigned) r); } \
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static inline T operator ^ (T l, T r) { return T ((unsigned) l ^ (unsigned) r); } \
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static inline T operator ~ (T r) { return T (~(unsigned int) r); } \
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static inline T& operator |= (T &l, T r) { l = l | r; return l; } \
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static inline T& operator &= (T& l, T r) { l = l & r; return l; } \
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static inline T& operator ^= (T& l, T r) { l = l ^ r; return l; } \
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}
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/* Useful for set-operations on small enums.
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* For example, for testing "x ∈ {x1, x2, x3}" use:
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* (FLAG_UNSAFE(x) & (FLAG(x1) | FLAG(x2) | FLAG(x3)))
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*/
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#define FLAG(x) (ASSERT_STATIC_EXPR_ZERO ((unsigned int)(x) < 32) + (1U << (unsigned int)(x)))
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#define FLAG_UNSAFE(x) ((unsigned int)(x) < 32 ? (1U << (unsigned int)(x)) : 0)
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#define FLAG_RANGE(x,y) (ASSERT_STATIC_EXPR_ZERO ((x) < (y)) + FLAG(y+1) - FLAG(x))
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/* Size signifying variable-sized array */
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#define VAR 1
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/* fallback for round() */
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static inline double
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_hb_round (double x)
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{
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if (x >= 0)
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return floor (x + 0.5);
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else
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return ceil (x - 0.5);
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}
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#if !defined (HAVE_ROUND) && !defined (HAVE_DECL_ROUND)
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#define round(x) _hb_round(x)
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#endif
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/* fallback for posix_memalign() */
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static inline int
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_hb_memalign(void **memptr, size_t alignment, size_t size)
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{
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if (unlikely (0 != (alignment & (alignment - 1)) ||
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!alignment ||
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0 != (alignment & (sizeof (void *) - 1))))
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return EINVAL;
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char *p = (char *) malloc (size + alignment - 1);
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if (unlikely (!p))
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return ENOMEM;
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size_t off = (size_t) p & (alignment - 1);
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if (off)
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p += alignment - off;
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*memptr = (void *) p;
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return 0;
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}
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#if !defined(posix_memalign) && !defined(HAVE_POSIX_MEMALIGN)
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#define posix_memalign _hb_memalign
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#endif
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/* Headers we include for everyone. Keep sorted. They express dependency amongst
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* themselves, but no other file should include them.*/
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#include "hb-atomic-private.hh"
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#include "hb-debug.hh"
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#include "hb-dsalgs.hh"
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#include "hb-mutex-private.hh"
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#include "hb-null.hh"
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#include "hb-object-private.hh"
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#endif /* HB_PRIVATE_HH */
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