harfbuzz/src/hb-private.hh

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/*
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* Copyright © 2007,2008,2009 Red Hat, Inc.
* 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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*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
#ifndef HB_PRIVATE_HH
#define HB_PRIVATE_HH
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#ifdef HAVE_CONFIG_H
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#include "config.h"
#endif
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#include "hb.h"
#define HB_H_IN
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#ifdef HAVE_OT
#include "hb-ot.h"
#define HB_OT_H_IN
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#endif
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
#include <assert.h>
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/* We only use these two for debug output. However, the debug code is
* always seen by the compiler (and optimized out in non-debug builds.
* If including these becomes a problem, we can start thinking about
* someway around that. */
#include <stdio.h>
#include <errno.h>
#include <stdarg.h>
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/* Compiler attributes */
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#if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
#define _HB_BOOLEAN_EXPR(expr) ((expr) ? 1 : 0)
#define likely(expr) (__builtin_expect (_HB_BOOLEAN_EXPR(expr), 1))
#define unlikely(expr) (__builtin_expect (_HB_BOOLEAN_EXPR(expr), 0))
#else
#define likely(expr) (expr)
#define unlikely(expr) (expr)
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#endif
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#ifndef __GNUC__
#undef __attribute__
#define __attribute__(x)
#endif
#if __GNUC__ >= 3
#define HB_PURE_FUNC __attribute__((pure))
#define HB_CONST_FUNC __attribute__((const))
#define HB_PRINTF_FUNC(format_idx, arg_idx) __attribute__((__format__ (__printf__, format_idx, arg_idx)))
#else
#define HB_PURE_FUNC
#define HB_CONST_FUNC
#define HB_PRINTF_FUNC(format_idx, arg_idx)
#endif
#if __GNUC__ >= 4
#define HB_UNUSED __attribute__((unused))
#else
#define HB_UNUSED
#endif
#ifndef HB_INTERNAL
# if !defined(__MINGW32__) && !defined(__CYGWIN__)
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# define HB_INTERNAL __attribute__((__visibility__("hidden")))
# else
# define HB_INTERNAL
# endif
#endif
#if __GNUC__ >= 3
#define HB_FUNC __PRETTY_FUNCTION__
#elif defined(_MSC_VER)
#define HB_FUNC __FUNCSIG__
#else
#define HB_FUNC __func__
#endif
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#if defined(_WIN32) || defined(__CYGWIN__)
/* We need Windows Vista for both Uniscribe backend and for
* MemoryBarrier. We don't support compiling on Windows XP,
* though we run on it fine. */
# if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0600
# undef _WIN32_WINNT
# endif
# ifndef _WIN32_WINNT
# define _WIN32_WINNT 0x0600
# endif
# ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN 1
# endif
# ifndef STRICT
# define STRICT 1
# endif
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# if defined(_WIN32_WCE)
/* Some things not defined on Windows CE. */
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# define strdup _strdup
# define getenv(Name) NULL
# if _WIN32_WCE < 0x800
# define setlocale(Category, Locale) "C"
static int errno = 0; /* Use something better? */
# endif
# elif defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_PC_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP)
# define getenv(Name) NULL
# endif
# if defined(_MSC_VER) && _MSC_VER < 1900
# define snprintf _snprintf
# endif
#endif
#if HAVE_ATEXIT
/* atexit() is only safe to be called from shared libraries on certain
* platforms. Whitelist.
* https://bugs.freedesktop.org/show_bug.cgi?id=82246 */
# if defined(__linux) && defined(__GLIBC_PREREQ)
# if __GLIBC_PREREQ(2,3)
/* From atexit() manpage, it's safe with glibc 2.2.3 on Linux. */
# define HB_USE_ATEXIT 1
# endif
# elif defined(_MSC_VER) || defined(__MINGW32__)
/* For MSVC:
* http://msdn.microsoft.com/en-ca/library/tze57ck3.aspx
* http://msdn.microsoft.com/en-ca/library/zk17ww08.aspx
* mingw32 headers say atexit is safe to use in shared libraries.
*/
# define HB_USE_ATEXIT 1
# elif defined(__ANDROID__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
/* This was fixed in Android NKD r8 or r8b:
* https://code.google.com/p/android/issues/detail?id=6455
* which introduced GCC 4.6:
* https://developer.android.com/tools/sdk/ndk/index.html
*/
# define HB_USE_ATEXIT 1
# endif
#endif
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/* Basics */
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#ifndef NULL
# define NULL ((void *) 0)
#endif
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#undef MIN
template <typename Type>
static inline Type MIN (const Type &a, const Type &b) { return a < b ? a : b; }
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#undef MAX
template <typename Type>
static inline Type MAX (const Type &a, const Type &b) { return a > b ? a : b; }
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static inline unsigned int DIV_CEIL (const unsigned int a, unsigned int b)
{ return (a + (b - 1)) / b; }
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#undef ARRAY_LENGTH
template <typename Type, unsigned int n>
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static inline unsigned int ARRAY_LENGTH (const Type (&)[n]) { return n; }
/* A const version, but does not detect erratically being called on pointers. */
#define ARRAY_LENGTH_CONST(__array) ((signed int) (sizeof (__array) / sizeof (__array[0])))
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#define HB_STMT_START do
#define HB_STMT_END while (0)
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#define _ASSERT_STATIC1(_line, _cond) HB_UNUSED typedef int _static_assert_on_line_##_line##_failed[(_cond)?1:-1]
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#define _ASSERT_STATIC0(_line, _cond) _ASSERT_STATIC1 (_line, (_cond))
#define ASSERT_STATIC(_cond) _ASSERT_STATIC0 (__LINE__, (_cond))
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/* Note: C++ allows sizeof() of variable-lengh arrays. So, if _cond is not
* constant, it still compiles (ouch!), but at least we'll get a -Wvla warning. */
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#define ASSERT_STATIC_EXPR_ZERO(_cond) (0 * sizeof (char[(_cond) ? 1 : -1]))
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#define _PASTE1(a,b) a##b
#define PASTE(a,b) _PASTE1(a,b)
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/* Lets assert int types. Saves trouble down the road. */
ASSERT_STATIC (sizeof (int8_t) == 1);
ASSERT_STATIC (sizeof (uint8_t) == 1);
ASSERT_STATIC (sizeof (int16_t) == 2);
ASSERT_STATIC (sizeof (uint16_t) == 2);
ASSERT_STATIC (sizeof (int32_t) == 4);
ASSERT_STATIC (sizeof (uint32_t) == 4);
ASSERT_STATIC (sizeof (int64_t) == 8);
ASSERT_STATIC (sizeof (uint64_t) == 8);
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ASSERT_STATIC (sizeof (hb_codepoint_t) == 4);
ASSERT_STATIC (sizeof (hb_position_t) == 4);
ASSERT_STATIC (sizeof (hb_mask_t) == 4);
ASSERT_STATIC (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; }
#define _ASSERT_TYPE_POD0(_line, _type) _ASSERT_TYPE_POD1 (_line, _type)
#define ASSERT_TYPE_POD(_type) _ASSERT_TYPE_POD0 (__LINE__, _type)
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#ifdef __GNUC__
# define _ASSERT_INSTANCE_POD1(_line, _instance) \
HB_STMT_START { \
typedef __typeof__(_instance) _type_##_line; \
_ASSERT_TYPE_POD1 (_line, _type_##_line); \
} 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)
# define ASSERT_INSTANCE_POD(_instance) _ASSERT_INSTANCE_POD0 (__LINE__, _instance)
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/* Check _assertion in a method environment */
#define _ASSERT_POD1(_line) \
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. */ }
# define _ASSERT_POD0(_line) _ASSERT_POD1 (_line)
# define ASSERT_POD() _ASSERT_POD0 (__LINE__)
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/* Misc */
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/* Void! */
struct _hb_void_t {};
typedef const _hb_void_t *hb_void_t;
#define HB_VOID ((const _hb_void_t *) NULL)
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/* Return the number of 1 bits in mask. */
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static inline HB_CONST_FUNC unsigned int
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_hb_popcount32 (uint32_t mask)
{
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
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return __builtin_popcount (mask);
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#else
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/* "HACKMEM 169" */
uint32_t y;
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y = (mask >> 1) &033333333333;
y = mask - y - ((y >>1) & 033333333333);
return (((y + (y >> 3)) & 030707070707) % 077);
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#endif
}
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/* Returns the number of bits needed to store number */
static inline HB_CONST_FUNC unsigned int
_hb_bit_storage (unsigned int number)
{
#if defined(__GNUC__) && (__GNUC__ >= 4) && defined(__OPTIMIZE__)
return likely (number) ? (sizeof (unsigned int) * 8 - __builtin_clz (number)) : 0;
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#else
unsigned int n_bits = 0;
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while (number) {
n_bits++;
number >>= 1;
}
return n_bits;
#endif
}
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/* Returns the number of zero bits in the least significant side of number */
static inline HB_CONST_FUNC unsigned int
_hb_ctz (unsigned int number)
{
#if defined(__GNUC__) && (__GNUC__ >= 4) && defined(__OPTIMIZE__)
return likely (number) ? __builtin_ctz (number) : 0;
#else
unsigned int n_bits = 0;
if (unlikely (!number)) return 0;
while (!(number & 1)) {
n_bits++;
number >>= 1;
}
return n_bits;
#endif
}
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static inline bool
_hb_unsigned_int_mul_overflows (unsigned int count, unsigned int size)
{
return (size > 0) && (count >= ((unsigned int) -1) / size);
}
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/* Type of bsearch() / qsort() compare function */
typedef int (*hb_compare_func_t) (const void *, const void *);
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/* arrays and maps */
#define HB_PREALLOCED_ARRAY_INIT {0, 0, NULL}
template <typename Type, unsigned int StaticSize=16>
struct hb_prealloced_array_t
{
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unsigned int len;
unsigned int allocated;
Type *array;
Type static_array[StaticSize];
void init (void) { memset (this, 0, sizeof (*this)); }
inline Type& operator [] (unsigned int i) { return array[i]; }
inline const Type& operator [] (unsigned int i) const { return array[i]; }
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inline Type *push (void)
{
if (!array) {
array = static_array;
allocated = ARRAY_LENGTH (static_array);
}
if (likely (len < allocated))
return &array[len++];
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/* Need to reallocate */
unsigned int new_allocated = allocated + (allocated >> 1) + 8;
Type *new_array = NULL;
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if (array == static_array) {
new_array = (Type *) calloc (new_allocated, sizeof (Type));
if (new_array)
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memcpy (new_array, array, len * sizeof (Type));
} else {
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bool overflows = (new_allocated < allocated) || _hb_unsigned_int_mul_overflows (new_allocated, sizeof (Type));
if (likely (!overflows)) {
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new_array = (Type *) realloc (array, new_allocated * sizeof (Type));
}
}
if (unlikely (!new_array))
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return NULL;
array = new_array;
allocated = new_allocated;
return &array[len++];
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}
inline void pop (void)
{
len--;
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}
inline void remove (unsigned int i)
{
if (unlikely (i >= len))
return;
memmove (static_cast<void *> (&array[i]),
static_cast<void *> (&array[i + 1]),
(len - i - 1) * sizeof (Type));
len--;
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}
inline void shrink (unsigned int l)
{
if (l < len)
len = l;
}
template <typename T>
inline Type *find (T v) {
for (unsigned int i = 0; i < len; i++)
if (array[i] == v)
return &array[i];
return NULL;
}
template <typename T>
inline const Type *find (T v) const {
for (unsigned int i = 0; i < len; i++)
if (array[i] == v)
return &array[i];
return NULL;
}
inline void qsort (void)
{
::qsort (array, len, sizeof (Type), (hb_compare_func_t) Type::cmp);
}
inline void qsort (unsigned int start, unsigned int end)
{
::qsort (array + start, end - start, sizeof (Type), (hb_compare_func_t) Type::cmp);
}
template <typename T>
inline Type *bsearch (T *key)
{
return (Type *) ::bsearch (key, array, len, sizeof (Type), (hb_compare_func_t) Type::cmp);
}
template <typename T>
inline const Type *bsearch (T *key) const
{
return (const Type *) ::bsearch (key, array, len, sizeof (Type), (hb_compare_func_t) Type::cmp);
}
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inline void finish (void)
{
if (array != static_array)
free (array);
array = NULL;
allocated = len = 0;
}
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};
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template <typename Type>
struct hb_auto_array_t : hb_prealloced_array_t <Type>
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{
hb_auto_array_t (void) { hb_prealloced_array_t<Type>::init (); }
~hb_auto_array_t (void) { hb_prealloced_array_t<Type>::finish (); }
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};
#define HB_LOCKABLE_SET_INIT {HB_PREALLOCED_ARRAY_INIT}
template <typename item_t, typename lock_t>
struct hb_lockable_set_t
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{
hb_prealloced_array_t <item_t, 2> items;
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inline void init (void) { items.init (); }
template <typename T>
inline item_t *replace_or_insert (T v, lock_t &l, bool replace)
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{
l.lock ();
item_t *item = items.find (v);
if (item) {
if (replace) {
item_t old = *item;
*item = v;
l.unlock ();
old.finish ();
}
else {
item = NULL;
l.unlock ();
}
} else {
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item = items.push ();
if (likely (item))
*item = v;
l.unlock ();
}
return item;
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}
template <typename T>
inline void remove (T v, lock_t &l)
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{
l.lock ();
item_t *item = items.find (v);
if (item) {
item_t old = *item;
*item = items[items.len - 1];
items.pop ();
l.unlock ();
old.finish ();
} else {
l.unlock ();
}
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}
template <typename T>
inline bool find (T v, item_t *i, lock_t &l)
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{
l.lock ();
item_t *item = items.find (v);
if (item)
*i = *item;
l.unlock ();
return !!item;
}
template <typename T>
inline item_t *find_or_insert (T v, lock_t &l)
{
l.lock ();
item_t *item = items.find (v);
if (!item) {
item = items.push ();
if (likely (item))
*item = v;
}
l.unlock ();
return item;
}
inline void finish (lock_t &l)
{
if (!items.len) {
/* No need for locking. */
items.finish ();
return;
}
l.lock ();
while (items.len) {
item_t old = items[items.len - 1];
items.pop ();
l.unlock ();
old.finish ();
l.lock ();
}
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items.finish ();
l.unlock ();
}
};
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/* ASCII tag/character handling */
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static inline bool ISALPHA (unsigned char c)
{ return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'); }
static inline bool ISALNUM (unsigned char c)
{ return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9'); }
static inline bool ISSPACE (unsigned char c)
{ return c == ' ' || c =='\f'|| c =='\n'|| c =='\r'|| c =='\t'|| c =='\v'; }
static inline unsigned char TOUPPER (unsigned char c)
{ return (c >= 'a' && c <= 'z') ? c - 'a' + 'A' : c; }
static inline unsigned char TOLOWER (unsigned char c)
{ return (c >= 'A' && c <= 'Z') ? c - 'A' + 'a' : c; }
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#define HB_TAG_CHAR4(s) (HB_TAG(((const char *) s)[0], \
((const char *) s)[1], \
((const char *) s)[2], \
((const char *) s)[3]))
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/* C++ helpers */
/* Makes class uncopyable. Use in private: section. */
#define NO_COPY(T) \
T (const T &o); \
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T &operator = (const T &o)
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/* Debug */
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#ifndef HB_DEBUG
#define HB_DEBUG 0
#endif
static inline bool
_hb_debug (unsigned int level,
unsigned int max_level)
{
return level < max_level;
}
#define DEBUG_LEVEL_ENABLED(WHAT, LEVEL) (_hb_debug ((LEVEL), HB_DEBUG_##WHAT))
#define DEBUG_ENABLED(WHAT) (DEBUG_LEVEL_ENABLED (WHAT, 0))
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static inline void
_hb_print_func (const char *func)
{
if (func)
{
unsigned int func_len = strlen (func);
/* Skip "static" */
if (0 == strncmp (func, "static ", 7))
func += 7;
/* Skip "typename" */
if (0 == strncmp (func, "typename ", 9))
func += 9;
/* Skip return type */
const char *space = strchr (func, ' ');
if (space)
func = space + 1;
/* Skip parameter list */
const char *paren = strchr (func, '(');
if (paren)
func_len = paren - func;
fprintf (stderr, "%.*s", func_len, func);
}
}
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template <int max_level> static inline void
_hb_debug_msg_va (const char *what,
const void *obj,
const char *func,
bool indented,
unsigned int level,
int level_dir,
const char *message,
va_list ap) HB_PRINTF_FUNC(7, 0);
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template <int max_level> static inline void
_hb_debug_msg_va (const char *what,
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const void *obj,
const char *func,
bool indented,
unsigned int level,
int level_dir,
const char *message,
va_list ap)
{
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if (!_hb_debug (level, max_level))
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return;
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fprintf (stderr, "%-10s", what ? what : "");
if (obj)
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fprintf (stderr, "(%0*lx) ", (unsigned int) (2 * sizeof (void *)), (unsigned long) obj);
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else
fprintf (stderr, " %*s ", (unsigned int) (2 * sizeof (void *)), "");
if (indented) {
/* One may want to add ASCII version of these. See:
* https://bugs.freedesktop.org/show_bug.cgi?id=50970 */
#define VBAR "\342\224\202" /* U+2502 BOX DRAWINGS LIGHT VERTICAL */
#define VRBAR "\342\224\234" /* U+251C BOX DRAWINGS LIGHT VERTICAL AND RIGHT */
#define DLBAR "\342\225\256" /* U+256E BOX DRAWINGS LIGHT ARC DOWN AND LEFT */
#define ULBAR "\342\225\257" /* U+256F BOX DRAWINGS LIGHT ARC UP AND LEFT */
#define LBAR "\342\225\264" /* U+2574 BOX DRAWINGS LIGHT LEFT */
static const char bars[] = VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR VBAR;
fprintf (stderr, "%2u %s" VRBAR "%s",
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level,
bars + sizeof (bars) - 1 - MIN ((unsigned int) sizeof (bars), (unsigned int) (sizeof (VBAR) - 1) * level),
level_dir ? (level_dir > 0 ? DLBAR : ULBAR) : LBAR);
} else
fprintf (stderr, " " VRBAR LBAR);
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_hb_print_func (func);
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if (message)
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{
fprintf (stderr, ": ");
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vfprintf (stderr, message, ap);
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}
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fprintf (stderr, "\n");
}
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template <> inline void
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_hb_debug_msg_va<0> (const char *what HB_UNUSED,
const void *obj HB_UNUSED,
const char *func HB_UNUSED,
bool indented HB_UNUSED,
unsigned int level HB_UNUSED,
int level_dir HB_UNUSED,
const char *message HB_UNUSED,
va_list ap HB_UNUSED) {}
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template <int max_level> static inline void
_hb_debug_msg (const char *what,
const void *obj,
const char *func,
bool indented,
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unsigned int level,
int level_dir,
const char *message,
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...) HB_PRINTF_FUNC(7, 8);
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template <int max_level> static inline void
_hb_debug_msg (const char *what,
const void *obj,
const char *func,
bool indented,
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unsigned int level,
int level_dir,
const char *message,
...)
{
va_list ap;
va_start (ap, message);
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_hb_debug_msg_va<max_level> (what, obj, func, indented, level, level_dir, message, ap);
va_end (ap);
}
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template <> inline void
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_hb_debug_msg<0> (const char *what HB_UNUSED,
const void *obj HB_UNUSED,
const char *func HB_UNUSED,
bool indented HB_UNUSED,
unsigned int level HB_UNUSED,
int level_dir HB_UNUSED,
const char *message HB_UNUSED,
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...) HB_PRINTF_FUNC(7, 8);
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template <> inline void
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_hb_debug_msg<0> (const char *what HB_UNUSED,
const void *obj HB_UNUSED,
const char *func HB_UNUSED,
bool indented HB_UNUSED,
unsigned int level HB_UNUSED,
int level_dir HB_UNUSED,
const char *message HB_UNUSED,
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...) {}
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#define DEBUG_MSG_LEVEL(WHAT, OBJ, LEVEL, LEVEL_DIR, ...) _hb_debug_msg<HB_DEBUG_##WHAT> (#WHAT, (OBJ), NULL, true, (LEVEL), (LEVEL_DIR), __VA_ARGS__)
#define DEBUG_MSG(WHAT, OBJ, ...) _hb_debug_msg<HB_DEBUG_##WHAT> (#WHAT, (OBJ), NULL, false, 0, 0, __VA_ARGS__)
#define DEBUG_MSG_FUNC(WHAT, OBJ, ...) _hb_debug_msg<HB_DEBUG_##WHAT> (#WHAT, (OBJ), HB_FUNC, false, 0, 0, __VA_ARGS__)
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/*
* Printer
*/
template <typename T>
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struct hb_printer_t {
const char *print (const T&) { return "something"; }
};
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template <>
struct hb_printer_t<bool> {
const char *print (bool v) { return v ? "true" : "false"; }
};
template <>
struct hb_printer_t<hb_void_t> {
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const char *print (hb_void_t) { return ""; }
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};
/*
* Trace
*/
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template <typename T>
static inline void _hb_warn_no_return (bool returned)
{
if (unlikely (!returned)) {
fprintf (stderr, "OUCH, returned with no call to TRACE_RETURN. This is a bug, please report.\n");
}
}
template <>
/*static*/ inline void _hb_warn_no_return<hb_void_t> (bool returned HB_UNUSED)
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{}
template <int max_level, typename ret_t>
struct hb_auto_trace_t {
explicit inline hb_auto_trace_t (unsigned int *plevel_,
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const char *what_,
const void *obj_,
const char *func,
const char *message,
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...) : plevel (plevel_), what (what_), obj (obj_), returned (false)
{
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if (plevel) ++*plevel;
va_list ap;
va_start (ap, message);
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_hb_debug_msg_va<max_level> (what, obj, func, true, plevel ? *plevel : 0, +1, message, ap);
va_end (ap);
}
inline ~hb_auto_trace_t (void)
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{
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_hb_warn_no_return<ret_t> (returned);
if (!returned) {
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_hb_debug_msg<max_level> (what, obj, NULL, true, plevel ? *plevel : 1, -1, " ");
}
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if (plevel) --*plevel;
}
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inline ret_t ret (ret_t v, unsigned int line = 0)
{
if (unlikely (returned)) {
fprintf (stderr, "OUCH, double calls to TRACE_RETURN. This is a bug, please report.\n");
return v;
}
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_hb_debug_msg<max_level> (what, obj, NULL, true, plevel ? *plevel : 1, -1,
"return %s (line %d)",
hb_printer_t<ret_t>().print (v), line);
if (plevel) --*plevel;
plevel = NULL;
returned = true;
return v;
}
private:
unsigned int *plevel;
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const char *what;
const void *obj;
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bool returned;
};
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template <typename ret_t> /* Optimize when tracing is disabled */
struct hb_auto_trace_t<0, ret_t> {
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explicit inline hb_auto_trace_t (unsigned int *plevel_ HB_UNUSED,
const char *what HB_UNUSED,
const void *obj HB_UNUSED,
const char *func HB_UNUSED,
const char *message HB_UNUSED,
...) {}
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inline ret_t ret (ret_t v, unsigned int line HB_UNUSED = 0) { return v; }
};
#define TRACE_RETURN(RET) trace.ret (RET, __LINE__)
/* Misc */
template <typename T> class hb_assert_unsigned_t;
template <> class hb_assert_unsigned_t<unsigned char> {};
template <> class hb_assert_unsigned_t<unsigned short> {};
template <> class hb_assert_unsigned_t<unsigned int> {};
template <> class hb_assert_unsigned_t<unsigned long> {};
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template <typename T> static inline bool
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hb_in_range (T u, T lo, T hi)
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{
/* The sizeof() is here to force template instantiation.
* I'm sure there are better ways to do this but can't think of
* one right now. Declaring a variable won't work as HB_UNUSED
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* is unusable on some platforms and unused types are less likely
* to generate a warning than unused variables. */
ASSERT_STATIC (sizeof (hb_assert_unsigned_t<T>) >= 0);
/* The casts below are important as if T is smaller than int,
* the subtract results will become a signed int! */
return (T)(u - lo) <= (T)(hi - lo);
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}
template <typename T> static inline bool
hb_in_ranges (T u, T lo1, T hi1, T lo2, T hi2)
{
return hb_in_range (u, lo1, hi1) || hb_in_range (u, lo2, hi2);
}
template <typename T> static inline bool
hb_in_ranges (T u, T lo1, T hi1, T lo2, T hi2, T lo3, T hi3)
{
return hb_in_range (u, lo1, hi1) || hb_in_range (u, lo2, hi2) || hb_in_range (u, lo3, hi3);
}
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/* Useful for set-operations on small enums.
* For example, for testing "x ∈ {x1, x2, x3}" use:
* (FLAG_SAFE(x) & (FLAG(x1) | FLAG(x2) | FLAG(x3)))
*/
#define FLAG(x) (ASSERT_STATIC_EXPR_ZERO ((x) < 32) + (1U << (x)))
#define FLAG_SAFE(x) (1U << (x))
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#define FLAG_UNSAFE(x) ((x) < 32 ? FLAG_SAFE(x) : 0)
#define FLAG_RANGE(x,y) (ASSERT_STATIC_EXPR_ZERO ((x) < (y)) + FLAG(y+1) - FLAG(x))
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template <typename T, typename T2> static inline void
hb_bubble_sort (T *array, unsigned int len, int(*compar)(const T *, const T *), T2 *array2)
{
if (unlikely (!len))
return;
unsigned int k = len - 1;
do {
unsigned int new_k = 0;
for (unsigned int j = 0; j < k; j++)
if (compar (&array[j], &array[j+1]) > 0)
{
{
T t;
t = array[j];
array[j] = array[j + 1];
array[j + 1] = t;
}
if (array2)
{
T2 t;
t = array2[j];
array2[j] = array2[j + 1];
array2[j + 1] = t;
}
new_k = j;
}
k = new_k;
} while (k);
}
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template <typename T> static inline void
hb_bubble_sort (T *array, unsigned int len, int(*compar)(const T *, const T *))
{
hb_bubble_sort (array, len, compar, (int *) NULL);
}
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static inline hb_bool_t
hb_codepoint_parse (const char *s, unsigned int len, int base, hb_codepoint_t *out)
{
/* Pain because we don't know whether s is nul-terminated. */
char buf[64];
len = MIN (ARRAY_LENGTH (buf) - 1, len);
strncpy (buf, s, len);
buf[len] = '\0';
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char *end;
errno = 0;
unsigned long v = strtoul (buf, &end, base);
if (errno) return false;
if (*end) return false;
*out = v;
return true;
}
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/* Global runtime options. */
struct hb_options_t
{
unsigned int initialized : 1;
unsigned int uniscribe_bug_compatible : 1;
};
union hb_options_union_t {
unsigned int i;
hb_options_t opts;
};
ASSERT_STATIC (sizeof (int) == sizeof (hb_options_union_t));
HB_INTERNAL void
_hb_options_init (void);
extern HB_INTERNAL hb_options_union_t _hb_options;
static inline hb_options_t
hb_options (void)
{
if (unlikely (!_hb_options.i))
_hb_options_init ();
return _hb_options.opts;
}
#endif /* HB_PRIVATE_HH */