1/*
2 * Copyright © 2007,2008,2009 Red Hat, Inc.
3 * Copyright © 2011,2012 Google, Inc.
4 *
5 * This is part of HarfBuzz, a text shaping library.
6 *
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
12 *
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
17 * DAMAGE.
18 *
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 *
25 * Red Hat Author(s): Behdad Esfahbod
26 * Google Author(s): Behdad Esfahbod
27 */
28
29#ifndef HB_HH
30#define HB_HH
31
32#ifndef HB_NO_PRAGMA_GCC_DIAGNOSTIC
33#if defined(_MSC_VER)
34#pragma warning( disable: 4068 ) /* Unknown pragma */
35#endif
36#if defined(__GNUC__) || defined(__clang__)
37/* Rules:
38 *
39 * - All pragmas are declared GCC even if they are clang ones. Otherwise GCC
40 * nags, even though we instruct it to ignore -Wunknown-pragmas. ¯\_(ツ)_/¯
41 *
42 * - Within each category, keep sorted.
43 *
44 * - Warnings whose scope can be expanded in future compiler versions shall
45 * be declared as "warning". Otherwise, either ignored or error.
46 */
47
48/* Setup. Don't sort order within this category. */
49#ifndef HB_NO_PRAGMA_GCC_DIAGNOSTIC_WARNING
50#pragma GCC diagnostic warning "-Wall"
51#pragma GCC diagnostic warning "-Wextra"
52#endif
53#ifndef HB_NO_PRAGMA_GCC_DIAGNOSTIC_IGNORED
54#pragma GCC diagnostic ignored "-Wpragmas"
55#pragma GCC diagnostic ignored "-Wunknown-pragmas"
56#pragma GCC diagnostic ignored "-Wunknown-warning-option"
57#endif
58#ifndef HB_NO_PRAGMA_GCC_DIAGNOSTIC_WARNING
59//#pragma GCC diagnostic warning "-Weverything"
60#endif
61
62/* Error. Should never happen. */
63#ifndef HB_NO_PRAGMA_GCC_DIAGNOSTIC_ERROR
64#pragma GCC diagnostic error "-Wc++11-narrowing"
65#pragma GCC diagnostic error "-Wcast-align"
66#pragma GCC diagnostic error "-Wcast-function-type"
67#pragma GCC diagnostic error "-Wdelete-non-virtual-dtor"
68#pragma GCC diagnostic error "-Wformat-security"
69#pragma GCC diagnostic error "-Wimplicit-function-declaration"
70#pragma GCC diagnostic error "-Winit-self"
71#pragma GCC diagnostic error "-Wmissing-braces"
72#pragma GCC diagnostic error "-Wmissing-declarations"
73#pragma GCC diagnostic error "-Wmissing-prototypes"
74#pragma GCC diagnostic error "-Wnested-externs"
75#pragma GCC diagnostic error "-Wold-style-definition"
76#pragma GCC diagnostic error "-Wpointer-arith"
77#pragma GCC diagnostic error "-Wredundant-decls"
78#pragma GCC diagnostic error "-Wreorder"
79#pragma GCC diagnostic error "-Wsign-compare"
80#pragma GCC diagnostic error "-Wstrict-prototypes"
81#pragma GCC diagnostic error "-Wstring-conversion"
82#pragma GCC diagnostic error "-Wswitch-enum"
83#pragma GCC diagnostic error "-Wtautological-overlap-compare"
84#pragma GCC diagnostic error "-Wunneeded-internal-declaration"
85#pragma GCC diagnostic error "-Wunused"
86#pragma GCC diagnostic error "-Wunused-local-typedefs"
87#pragma GCC diagnostic error "-Wunused-value"
88#pragma GCC diagnostic error "-Wunused-variable"
89#pragma GCC diagnostic error "-Wvla"
90#pragma GCC diagnostic error "-Wwrite-strings"
91#endif
92
93/* Warning. To be investigated if happens. */
94#ifndef HB_NO_PRAGMA_GCC_DIAGNOSTIC_WARNING
95#pragma GCC diagnostic warning "-Wbuiltin-macro-redefined"
96#pragma GCC diagnostic warning "-Wdisabled-optimization"
97#pragma GCC diagnostic warning "-Wformat=2"
98#pragma GCC diagnostic warning "-Wignored-pragma-optimize"
99#pragma GCC diagnostic warning "-Wlogical-op"
100#pragma GCC diagnostic warning "-Wmaybe-uninitialized"
101#pragma GCC diagnostic warning "-Wmissing-format-attribute"
102#pragma GCC diagnostic warning "-Wundef"
103#endif
104
105/* Ignored currently, but should be fixed at some point. */
106#ifndef HB_NO_PRAGMA_GCC_DIAGNOSTIC_IGNORED
107#pragma GCC diagnostic ignored "-Wconversion" // TODO fix
108#pragma GCC diagnostic ignored "-Wformat-signedness" // TODO fix
109#pragma GCC diagnostic ignored "-Wshadow" // TODO fix
110#pragma GCC diagnostic ignored "-Wunsafe-loop-optimizations" // TODO fix
111#pragma GCC diagnostic ignored "-Wunused-parameter" // TODO fix
112#endif
113
114/* Ignored intentionally. */
115#ifndef HB_NO_PRAGMA_GCC_DIAGNOSTIC_IGNORED
116#pragma GCC diagnostic ignored "-Wclass-memaccess"
117#pragma GCC diagnostic ignored "-Wformat-nonliteral"
118#pragma GCC diagnostic ignored "-Wformat-zero-length"
119#pragma GCC diagnostic ignored "-Wmissing-field-initializers"
120#pragma GCC diagnostic ignored "-Wpacked" // Erratic impl in clang
121#pragma GCC diagnostic ignored "-Wstrict-aliasing"
122#pragma GCC diagnostic ignored "-Wtype-limits"
123#endif
124
125#endif
126#endif
127
128#ifdef HAVE_CONFIG_H
129#include "config.h"
130#endif
131
132/*
133 * Following added based on what AC_USE_SYSTEM_EXTENSIONS adds to
134 * config.h.in. Copied here for the convenience of those embedding
135 * HarfBuzz and not using our build system.
136 */
137/* Enable extensions on AIX 3, Interix. */
138#ifndef _ALL_SOURCE
139# define _ALL_SOURCE 1
140#endif
141/* Enable GNU extensions on systems that have them. */
142#ifndef _GNU_SOURCE
143# define _GNU_SOURCE 1
144#endif
145/* Enable threading extensions on Solaris. */
146#ifndef _POSIX_PTHREAD_SEMANTICS
147# define _POSIX_PTHREAD_SEMANTICS 1
148#endif
149/* Enable extensions on HP NonStop. */
150#ifndef _TANDEM_SOURCE
151# define _TANDEM_SOURCE 1
152#endif
153/* Enable general extensions on Solaris. */
154#ifndef __EXTENSIONS__
155# define __EXTENSIONS__ 1
156#endif
157
158#if defined (_MSC_VER) && defined (HB_DLL_EXPORT)
159#define HB_EXTERN __declspec (dllexport) extern
160#endif
161
162#include "hb.h"
163#define HB_H_IN
164#include "hb-ot.h"
165#define HB_OT_H_IN
166#include "hb-aat.h"
167#define HB_AAT_H_IN
168
169#include "hb-aat.h"
170
171#include <math.h>
172#include <stdlib.h>
173#include <stddef.h>
174#include <string.h>
175#include <assert.h>
176#include <errno.h>
177#include <stdio.h>
178#include <stdarg.h>
179
180#if (defined(_MSC_VER) && _MSC_VER >= 1500) || defined(__MINGW32__)
181#include <intrin.h>
182#endif
183
184#define HB_PASTE1(a,b) a##b
185#define HB_PASTE(a,b) HB_PASTE1(a,b)
186
187
188/* Compile-time custom allocator support. */
189
190#if defined(hb_malloc_impl) \
191 && defined(hb_calloc_impl) \
192 && defined(hb_realloc_impl) \
193 && defined(hb_free_impl)
194extern "C" void* hb_malloc_impl(size_t size);
195extern "C" void* hb_calloc_impl(size_t nmemb, size_t size);
196extern "C" void* hb_realloc_impl(void *ptr, size_t size);
197extern "C" void hb_free_impl(void *ptr);
198#define malloc hb_malloc_impl
199#define calloc hb_calloc_impl
200#define realloc hb_realloc_impl
201#define free hb_free_impl
202
203#if defined(hb_memalign_impl)
204extern "C" int hb_memalign_impl(void **memptr, size_t alignment, size_t size);
205#define posix_memalign hb_memalign_impl
206#else
207#undef HAVE_POSIX_MEMALIGN
208#endif
209
210#endif
211
212
213/*
214 * Compiler attributes
215 */
216
217#if __cplusplus < 201103L
218
219#ifndef nullptr
220#define nullptr NULL
221#endif
222
223#ifndef constexpr
224#define constexpr const
225#endif
226
227#ifndef static_assert
228#define static_assert(e, msg) \
229 HB_UNUSED typedef int HB_PASTE(static_assertion_failed_at_line_, __LINE__) [(e) ? 1 : -1]
230#endif // static_assert
231
232#if defined(__GNUC__)
233#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8))
234#define thread_local __thread
235#endif
236#else
237#define thread_local
238#endif
239
240template <typename T>
241struct _hb_alignof
242{
243 struct s
244 {
245 char c;
246 T t;
247 };
248 static constexpr size_t value = offsetof (s, t);
249};
250#ifndef alignof
251#define alignof(x) (_hb_alignof<x>::value)
252#endif
253
254/* https://github.com/harfbuzz/harfbuzz/issues/1127 */
255#ifndef explicit_operator
256#define explicit_operator operator
257#endif
258
259#else /* __cplusplus >= 201103L */
260
261/* https://github.com/harfbuzz/harfbuzz/issues/1127 */
262#ifndef explicit_operator
263#define explicit_operator explicit operator
264#endif
265
266#endif /* __cplusplus < 201103L */
267
268
269#if (defined(__GNUC__) || defined(__clang__)) && defined(__OPTIMIZE__)
270#define likely(expr) (__builtin_expect (!!(expr), 1))
271#define unlikely(expr) (__builtin_expect (!!(expr), 0))
272#else
273#define likely(expr) (expr)
274#define unlikely(expr) (expr)
275#endif
276
277#if !defined(__GNUC__) && !defined(__clang__)
278#undef __attribute__
279#define __attribute__(x)
280#endif
281
282#if defined(__GNUC__) && (__GNUC__ >= 3)
283#define HB_PURE_FUNC __attribute__((pure))
284#define HB_CONST_FUNC __attribute__((const))
285#define HB_PRINTF_FUNC(format_idx, arg_idx) __attribute__((__format__ (__printf__, format_idx, arg_idx)))
286#else
287#define HB_PURE_FUNC
288#define HB_CONST_FUNC
289#define HB_PRINTF_FUNC(format_idx, arg_idx)
290#endif
291#if defined(__GNUC__) && (__GNUC__ >= 4)
292#define HB_UNUSED __attribute__((unused))
293#elif defined(_MSC_VER) /* https://github.com/harfbuzz/harfbuzz/issues/635 */
294#define HB_UNUSED __pragma(warning(suppress: 4100 4101))
295#else
296#define HB_UNUSED
297#endif
298
299#ifndef HB_INTERNAL
300# if !defined(HB_NO_VISIBILITY) && !defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(_MSC_VER) && !defined(__SUNPRO_CC)
301# define HB_INTERNAL __attribute__((__visibility__("hidden")))
302# elif defined(__MINGW32__)
303 /* We use -export-symbols on mingw32, since it does not support visibility attributes. */
304# define HB_INTERNAL
305# elif defined (_MSC_VER) && defined (HB_DLL_EXPORT)
306 /* We do not try to export internal symbols on Visual Studio */
307# define HB_INTERNAL
308#else
309# define HB_INTERNAL
310# define HB_NO_VISIBILITY 1
311# endif
312#endif
313
314#if defined(__GNUC__) && (__GNUC__ >= 3)
315#define HB_FUNC __PRETTY_FUNCTION__
316#elif defined(_MSC_VER)
317#define HB_FUNC __FUNCSIG__
318#else
319#define HB_FUNC __func__
320#endif
321
322#if defined(__SUNPRO_CC) && (__SUNPRO_CC < 0x5140)
323/* https://github.com/harfbuzz/harfbuzz/issues/630 */
324#define __restrict
325#endif
326
327/*
328 * Borrowed from https://bugzilla.mozilla.org/show_bug.cgi?id=1215411
329 * HB_FALLTHROUGH is an annotation to suppress compiler warnings about switch
330 * cases that fall through without a break or return statement. HB_FALLTHROUGH
331 * is only needed on cases that have code:
332 *
333 * switch (foo) {
334 * case 1: // These cases have no code. No fallthrough annotations are needed.
335 * case 2:
336 * case 3:
337 * foo = 4; // This case has code, so a fallthrough annotation is needed:
338 * HB_FALLTHROUGH;
339 * default:
340 * return foo;
341 * }
342 */
343#if defined(__clang__) && __cplusplus >= 201103L
344 /* clang's fallthrough annotations are only available starting in C++11. */
345# define HB_FALLTHROUGH [[clang::fallthrough]]
346#elif defined(__GNUC__) && (__GNUC__ >= 7)
347 /* GNU fallthrough attribute is available from GCC7 */
348# define HB_FALLTHROUGH __attribute__((fallthrough))
349#elif defined(_MSC_VER)
350 /*
351 * MSVC's __fallthrough annotations are checked by /analyze (Code Analysis):
352 * https://msdn.microsoft.com/en-us/library/ms235402%28VS.80%29.aspx
353 */
354# include <sal.h>
355# define HB_FALLTHROUGH __fallthrough
356#else
357# define HB_FALLTHROUGH /* FALLTHROUGH */
358#endif
359
360#if defined(__clang__)
361/* Disable certain sanitizer errors. */
362/* https://github.com/harfbuzz/harfbuzz/issues/1247 */
363#define HB_NO_SANITIZE_SIGNED_INTEGER_OVERFLOW __attribute__((no_sanitize("signed-integer-overflow")))
364#else
365#define HB_NO_SANITIZE_SIGNED_INTEGER_OVERFLOW
366#endif
367
368
369#ifdef _WIN32
370 /* We need Windows Vista for both Uniscribe backend and for
371 * MemoryBarrier. We don't support compiling on Windows XP,
372 * though we run on it fine. */
373# if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0600
374# undef _WIN32_WINNT
375# endif
376# ifndef _WIN32_WINNT
377# if !defined(WINAPI_FAMILY) || !(WINAPI_FAMILY==WINAPI_FAMILY_PC_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP)
378# define _WIN32_WINNT 0x0600
379# endif
380# endif
381# ifndef WIN32_LEAN_AND_MEAN
382# define WIN32_LEAN_AND_MEAN 1
383# endif
384# ifndef STRICT
385# define STRICT 1
386# endif
387
388# if defined(_WIN32_WCE)
389 /* Some things not defined on Windows CE. */
390# define vsnprintf _vsnprintf
391# define getenv(Name) nullptr
392# if _WIN32_WCE < 0x800
393# define setlocale(Category, Locale) "C"
394static int errno = 0; /* Use something better? */
395# endif
396# elif defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_PC_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP)
397# define getenv(Name) nullptr
398# endif
399# if defined(_MSC_VER) && _MSC_VER < 1900
400# define snprintf _snprintf
401# endif
402#endif
403
404#if defined(HAVE_ATEXIT) && !defined(HB_USE_ATEXIT)
405/* atexit() is only safe to be called from shared libraries on certain
406 * platforms. Whitelist.
407 * https://bugs.freedesktop.org/show_bug.cgi?id=82246 */
408# if defined(__linux) && defined(__GLIBC_PREREQ)
409# if __GLIBC_PREREQ(2,3)
410/* From atexit() manpage, it's safe with glibc 2.2.3 on Linux. */
411# define HB_USE_ATEXIT 1
412# endif
413# elif defined(_MSC_VER) || defined(__MINGW32__)
414/* For MSVC:
415 * https://msdn.microsoft.com/en-us/library/tze57ck3.aspx
416 * https://msdn.microsoft.com/en-us/library/zk17ww08.aspx
417 * mingw32 headers say atexit is safe to use in shared libraries.
418 */
419# define HB_USE_ATEXIT 1
420# elif defined(__ANDROID__)
421/* This is available since Android NKD r8 or r8b:
422 * https://issuetracker.google.com/code/p/android/issues/detail?id=6455
423 */
424# define HB_USE_ATEXIT 1
425# elif defined(__APPLE__)
426/* For macOS and related platforms, the atexit man page indicates
427 * that it will be invoked when the library is unloaded, not only
428 * at application exit.
429 */
430# define HB_USE_ATEXIT 1
431# endif
432#endif
433#ifdef HB_NO_ATEXIT
434# undef HB_USE_ATEXIT
435#endif
436#ifndef HB_USE_ATEXIT
437# define HB_USE_ATEXIT 0
438#endif
439
440#define HB_STMT_START do
441#define HB_STMT_END while (0)
442
443/* Static-assert as expression. */
444template <unsigned int cond> class hb_assert_constant_t;
445template <> class hb_assert_constant_t<1> {};
446#define ASSERT_STATIC_EXPR_ZERO(_cond) (0 * (unsigned int) sizeof (hb_assert_constant_t<_cond>))
447
448/* Lets assert int types. Saves trouble down the road. */
449static_assert ((sizeof (int8_t) == 1), "");
450static_assert ((sizeof (uint8_t) == 1), "");
451static_assert ((sizeof (int16_t) == 2), "");
452static_assert ((sizeof (uint16_t) == 2), "");
453static_assert ((sizeof (int32_t) == 4), "");
454static_assert ((sizeof (uint32_t) == 4), "");
455static_assert ((sizeof (int64_t) == 8), "");
456static_assert ((sizeof (uint64_t) == 8), "");
457static_assert ((sizeof (hb_codepoint_t) == 4), "");
458static_assert ((sizeof (hb_position_t) == 4), "");
459static_assert ((sizeof (hb_mask_t) == 4), "");
460static_assert ((sizeof (hb_var_int_t) == 4), "");
461
462
463#if __cplusplus >= 201103L
464
465/* We only enable these with C++11 or later, since earlier language
466 * does not allow structs with constructors in unions, and we need
467 * those. */
468
469#define HB_NO_COPY_ASSIGN(TypeName) \
470 TypeName(const TypeName&); \
471 void operator=(const TypeName&)
472#define HB_NO_COPY_ASSIGN_TEMPLATE(TypeName, T) \
473 TypeName(const TypeName<T>&); \
474 void operator=(const TypeName<T>&)
475#define HB_NO_COPY_ASSIGN_TEMPLATE2(TypeName, T1, T2) \
476 TypeName(const TypeName<T1, T2>&); \
477 void operator=(const TypeName<T1, T2>&)
478#define HB_NO_CREATE_COPY_ASSIGN(TypeName) \
479 TypeName(); \
480 TypeName(const TypeName&); \
481 void operator=(const TypeName&)
482#define HB_NO_CREATE_COPY_ASSIGN_TEMPLATE(TypeName, T) \
483 TypeName(); \
484 TypeName(const TypeName<T>&); \
485 void operator=(const TypeName<T>&)
486#define HB_NO_CREATE_COPY_ASSIGN_TEMPLATE2(TypeName, T1, T2) \
487 TypeName(); \
488 TypeName(const TypeName<T1, T2>&); \
489 void operator=(const TypeName<T1, T2>&)
490
491#else /* __cpluspplus >= 201103L */
492
493#define HB_NO_COPY_ASSIGN(TypeName) static_assert (true, "")
494#define HB_NO_COPY_ASSIGN_TEMPLATE(TypeName, T) static_assert (true, "")
495#define HB_NO_COPY_ASSIGN_TEMPLATE2(TypeName, T1, T2) static_assert (true, "")
496#define HB_NO_CREATE_COPY_ASSIGN(TypeName) static_assert (true, "")
497#define HB_NO_CREATE_COPY_ASSIGN_TEMPLATE(TypeName, T) static_assert (true, "")
498#define HB_NO_CREATE_COPY_ASSIGN_TEMPLATE2(TypeName, T1, T2) static_assert (true, "")
499
500#endif /* __cpluspplus >= 201103L */
501
502
503/*
504 * Compiler-assisted vectorization parameters.
505 */
506
507/*
508 * Disable vectorization for now. To correctly use them, we should
509 * use posix_memalign() to allocate in hb_vector_t. Otherwise, can
510 * cause misaligned access.
511 *
512 * https://bugs.chromium.org/p/chromium/issues/detail?id=860184
513 */
514#if !defined(HB_VECTOR_SIZE)
515# define HB_VECTOR_SIZE 0
516#endif
517
518/* The `vector_size' attribute was introduced in gcc 3.1. */
519#if !defined(HB_VECTOR_SIZE)
520# if defined( __GNUC__ ) && ( __GNUC__ >= 4 )
521# define HB_VECTOR_SIZE 128
522# else
523# define HB_VECTOR_SIZE 0
524# endif
525#endif
526static_assert (0 == (HB_VECTOR_SIZE & (HB_VECTOR_SIZE - 1)), "HB_VECTOR_SIZE is not power of 2.");
527static_assert (0 == (HB_VECTOR_SIZE % 64), "HB_VECTOR_SIZE is not multiple of 64.");
528#if HB_VECTOR_SIZE
529typedef uint64_t hb_vector_size_impl_t __attribute__((vector_size (HB_VECTOR_SIZE / 8)));
530#else
531typedef uint64_t hb_vector_size_impl_t;
532#endif
533
534
535/* HB_NDEBUG disables some sanity checks that are very safe to disable and
536 * should be disabled in production systems. If NDEBUG is defined, enable
537 * HB_NDEBUG; but if it's desirable that normal assert()s (which are very
538 * light-weight) to be enabled, then HB_DEBUG can be defined to disable
539 * the costlier checks. */
540#ifdef NDEBUG
541#define HB_NDEBUG 1
542#endif
543
544
545/* Flags */
546
547/* Enable bitwise ops on enums marked as flags_t */
548/* To my surprise, looks like the function resolver is happy to silently cast
549 * one enum to another... So this doesn't provide the type-checking that I
550 * originally had in mind... :(.
551 *
552 * For MSVC warnings, see: https://github.com/harfbuzz/harfbuzz/pull/163
553 */
554#ifdef _MSC_VER
555# pragma warning(disable:4200)
556# pragma warning(disable:4800)
557#endif
558#define HB_MARK_AS_FLAG_T(T) \
559 extern "C++" { \
560 static inline T operator | (T l, T r) { return T ((unsigned) l | (unsigned) r); } \
561 static inline T operator & (T l, T r) { return T ((unsigned) l & (unsigned) r); } \
562 static inline T operator ^ (T l, T r) { return T ((unsigned) l ^ (unsigned) r); } \
563 static inline T operator ~ (T r) { return T (~(unsigned int) r); } \
564 static inline T& operator |= (T &l, T r) { l = l | r; return l; } \
565 static inline T& operator &= (T& l, T r) { l = l & r; return l; } \
566 static inline T& operator ^= (T& l, T r) { l = l ^ r; return l; } \
567 } \
568 static_assert (true, "")
569
570/* Useful for set-operations on small enums.
571 * For example, for testing "x ∈ {x1, x2, x3}" use:
572 * (FLAG_UNSAFE(x) & (FLAG(x1) | FLAG(x2) | FLAG(x3)))
573 */
574#define FLAG(x) (ASSERT_STATIC_EXPR_ZERO ((unsigned)(x) < 32) + (((uint32_t) 1U) << (unsigned)(x)))
575#define FLAG_UNSAFE(x) ((unsigned)(x) < 32 ? (((uint32_t) 1U) << (unsigned)(x)) : 0)
576#define FLAG_RANGE(x,y) (ASSERT_STATIC_EXPR_ZERO ((x) < (y)) + FLAG(y+1) - FLAG(x))
577#define FLAG64(x) (ASSERT_STATIC_EXPR_ZERO ((unsigned)(x) < 64) + (((uint64_t) 1ULL) << (unsigned)(x)))
578#define FLAG64_UNSAFE(x) ((unsigned)(x) < 64 ? (((uint64_t) 1ULL) << (unsigned)(x)) : 0)
579
580
581/* Size signifying variable-sized array */
582#define VAR 1
583
584
585/* fallback for round() */
586static inline double
587_hb_round (double x)
588{
589 if (x >= 0)
590 return floor (x + 0.5);
591 else
592 return ceil (x - 0.5);
593}
594#if !defined (HAVE_ROUND) && !defined (HAVE_DECL_ROUND)
595#define round(x) _hb_round(x)
596#endif
597
598
599/* fallback for posix_memalign() */
600static inline int
601_hb_memalign(void **memptr, size_t alignment, size_t size)
602{
603 if (unlikely (0 != (alignment & (alignment - 1)) ||
604 !alignment ||
605 0 != (alignment & (sizeof (void *) - 1))))
606 return EINVAL;
607
608 char *p = (char *) malloc (size + alignment - 1);
609 if (unlikely (!p))
610 return ENOMEM;
611
612 size_t off = (size_t) p & (alignment - 1);
613 if (off)
614 p += alignment - off;
615
616 *memptr = (void *) p;
617
618 return 0;
619}
620#if !defined(posix_memalign) && !defined(HAVE_POSIX_MEMALIGN)
621#define posix_memalign _hb_memalign
622#endif
623
624
625/*
626 * For lack of a better place, put Zawgyi script hack here.
627 * https://github.com/harfbuzz/harfbuzz/issues/1162
628 */
629
630#define HB_SCRIPT_MYANMAR_ZAWGYI ((hb_script_t) HB_TAG ('Q','a','a','g'))
631
632
633/* Some really basic things everyone wants. */
634template <typename T> struct hb_remove_const { typedef T value; };
635template <typename T> struct hb_remove_const<const T> { typedef T value; };
636#define hb_remove_const(T) hb_remove_const<T>::value
637template <typename T> struct hb_remove_reference { typedef T value; };
638template <typename T> struct hb_remove_reference<T &> { typedef T value; };
639#define hb_remove_reference(T) hb_remove_reference<T>::value
640template <typename T> struct hb_remove_pointer { typedef T value; };
641template <typename T> struct hb_remove_pointer<T *> { typedef T value; };
642#define hb_remove_pointer(T) hb_remove_pointer<T>::value
643
644
645/* Headers we include for everyone. Keep topologically sorted by dependency.
646 * They express dependency amongst themselves, but no other file should include
647 * them directly.*/
648#include "hb-atomic.hh"
649#include "hb-mutex.hh"
650#include "hb-null.hh"
651#include "hb-dsalgs.hh" // Requires: hb-null
652#include "hb-iter.hh" // Requires: hb-null
653#include "hb-debug.hh" // Requires: hb-atomic hb-dsalgs
654#include "hb-array.hh" // Requires: hb-dsalgs hb-iter hb-null
655#include "hb-vector.hh" // Requires: hb-array hb-null
656#include "hb-object.hh" // Requires: hb-atomic hb-mutex hb-vector
657
658#endif /* HB_HH */
659