third_party/harfbuzz-ng/src/hb-private.hh

   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_PRIVATE_HH
  30 #define HB_PRIVATE_HH
  31
  32 #ifdef HAVE_CONFIG_H
  33 #include "config.h"
  34 #endif
  35
  36 #include "hb.h"
  37 #define HB_H_IN
  38 #ifdef HAVE_OT
  39 #include "hb-ot.h"
  40 #define HB_OT_H_IN
  41 #endif
  42
  43 #include <stdlib.h>
  44 #include <stddef.h>
  45 #include <string.h>
  46 #include <assert.h>
  47
  48 /* We only use these two for debug output.  However, the debug code is
  49  * always seen by the compiler (and optimized out in non-debug builds.
  50  * If including these becomes a problem, we can start thinking about
  51  * someway around that. */
  52 #include <stdio.h>
  53 #include <errno.h>
  54 #include <stdarg.h>
  55
  56
  57 /* Compiler attributes */
  58
  59
  60 #if defined(__GNUC__) && (__GNUC__ > 2) && defined(__OPTIMIZE__)
  61 #define _HB_BOOLEAN_EXPR(expr) ((expr) ? 1 : 0)
  62 #define likely(expr) (__builtin_expect (_HB_BOOLEAN_EXPR(expr), 1))
  63 #define unlikely(expr) (__builtin_expect (_HB_BOOLEAN_EXPR(expr), 0))
  64 #else
  65 #define likely(expr) (expr)
  66 #define unlikely(expr) (expr)
  67 #endif
  68
  69 #ifndef __GNUC__
  70 #undef __attribute__
  71 #define __attribute__(x)
  72 #endif
  73
  74 #if __GNUC__ >= 3
  75 #define HB_PURE_FUNC    __attribute__((pure))
  76 #define HB_CONST_FUNC   __attribute__((const))
  77 #define HB_PRINTF_FUNC(format_idx, arg_idx) __attribute__((__format__ (__printf__, format_idx, arg_idx)))
  78 #else
  79 #define HB_PURE_FUNC
  80 #define HB_CONST_FUNC
  81 #define HB_PRINTF_FUNC(format_idx, arg_idx)
  82 #endif
  83 #if __GNUC__ >= 4
  84 #define HB_UNUSED       __attribute__((unused))
  85 #else
  86 #define HB_UNUSED
  87 #endif
  88
  89 #ifndef HB_INTERNAL
  90 # if !defined(__MINGW32__) && !defined(__CYGWIN__)
  91 #  define HB_INTERNAL __attribute__((__visibility__("hidden")))
  92 # else
  93 #  define HB_INTERNAL
  94 # endif
  95 #endif
  96
  97 #if __GNUC__ >= 3
  98 #define HB_FUNC __PRETTY_FUNCTION__
  99 #elif defined(_MSC_VER)
 100 #define HB_FUNC __FUNCSIG__
 101 #else
 102 #define HB_FUNC __func__
 103 #endif
 104
 105 #if defined(_WIN32) || defined(__CYGWIN__)
 106    /* We need Windows Vista for both Uniscribe backend and for
 107     * MemoryBarrier.  We don't support compiling on Windows XP,
 108     * though we run on it fine. */
 109 #  if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0600
 110 #    undef _WIN32_WINNT
 111 #  endif
 112 #  ifndef _WIN32_WINNT
 113 #    define _WIN32_WINNT 0x0600
 114 #  endif
 115 #  ifndef WIN32_LEAN_AND_MEAN
 116 #    define WIN32_LEAN_AND_MEAN 1
 117 #  endif
 118 #  ifndef STRICT
 119 #    define STRICT 1
 120 #  endif
 121
 122 #  if defined(_WIN32_WCE)
 123      /* Some things not defined on Windows CE. */
 124 #    define getenv(Name) NULL
 125 #    define setlocale(Category, Locale) "C"
 126 static int errno = 0; /* Use something better? */
 127 #  elif defined(WINAPI_FAMILY) && (WINAPI_FAMILY==WINAPI_FAMILY_PC_APP || WINAPI_FAMILY==WINAPI_FAMILY_PHONE_APP)
 128 #    define getenv(Name) NULL
 129 #  endif
 130 #  if (defined(__WIN32__) && !defined(__WINE__)) || defined(_MSC_VER)
 131 #    define snprintf _snprintf
 132      /* Windows CE only has _strdup, while rest of Windows has both. */
 133 #    define strdup _strdup
 134 #  endif
 135 #endif
 136
 137 #if HAVE_ATEXIT
 138 /* atexit() is only safe to be called from shared libraries on certain
 139  * platforms.  Whitelist.
 140  * https://bugs.freedesktop.org/show_bug.cgi?id=82246 */
 141 #  if defined(__linux) && defined(__GLIBC_PREREQ)
 142 #    if __GLIBC_PREREQ(2,3)
 143 /* From atexit() manpage, it's safe with glibc 2.2.3 on Linux. */
 144 #      define HB_USE_ATEXIT 1
 145 #    endif
 146 #  elif defined(_MSC_VER) || defined(__MINGW32__)
 147 /* For MSVC:
 148  * http://msdn.microsoft.com/en-ca/library/tze57ck3.aspx
 149  * http://msdn.microsoft.com/en-ca/library/zk17ww08.aspx
 150  * mingw32 headers say atexit is safe to use in shared libraries.
 151  */
 152 #    define HB_USE_ATEXIT 1
 153 #  elif defined(__ANDROID__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
 154 /* This was fixed in Android NKD r8 or r8b:
 155  * https://code.google.com/p/android/issues/detail?id=6455
 156  * which introduced GCC 4.6:
 157  * https://developer.android.com/tools/sdk/ndk/index.html
 158  */
 159 #    define HB_USE_ATEXIT 1
 160 #  endif
 161 #endif
 162
 163 /* Basics */
 164
 165
 166 #ifndef NULL
 167 # define NULL ((void *) 0)
 168 #endif
 169
 170 #undef MIN
 171 template <typename Type>
 172 static inline Type MIN (const Type &a, const Type &b) { return a < b ? a : b; }
 173
 174 #undef MAX
 175 template <typename Type>
 176 static inline Type MAX (const Type &a, const Type &b) { return a > b ? a : b; }
 177
 178 static inline unsigned int DIV_CEIL (const unsigned int a, unsigned int b)
 179 { return (a + (b - 1)) / b; }
 180
 181
 182 #undef  ARRAY_LENGTH
 183 template <typename Type, unsigned int n>
 184 static inline unsigned int ARRAY_LENGTH (const Type (&)[n]) { return n; }
 185 /* A const version, but does not detect erratically being called on pointers. */
 186 #define ARRAY_LENGTH_CONST(__array) ((signed int) (sizeof (__array) / sizeof (__array[0])))
 187
 188 #define HB_STMT_START do
 189 #define HB_STMT_END   while (0)
 190
 191 #define _ASSERT_STATIC1(_line, _cond)   HB_UNUSED typedef int _static_assert_on_line_##_line##_failed[(_cond)?1:-1]
 192 #define _ASSERT_STATIC0(_line, _cond)   _ASSERT_STATIC1 (_line, (_cond))
 193 #define ASSERT_STATIC(_cond)            _ASSERT_STATIC0 (__LINE__, (_cond))
 194
 195 #define ASSERT_STATIC_EXPR(_cond)((void) sizeof (char[(_cond) ? 1 : -1]))
 196 #define ASSERT_STATIC_EXPR_ZERO(_cond) (0 * sizeof (char[(_cond) ? 1 : -1]))
 197
 198 #define _PASTE1(a,b) a##b
 199 #define PASTE(a,b) _PASTE1(a,b)
 200
 201 /* Lets assert int types.  Saves trouble down the road. */
 202
 203 ASSERT_STATIC (sizeof (int8_t) == 1);
 204 ASSERT_STATIC (sizeof (uint8_t) == 1);
 205 ASSERT_STATIC (sizeof (int16_t) == 2);
 206 ASSERT_STATIC (sizeof (uint16_t) == 2);
 207 ASSERT_STATIC (sizeof (int32_t) == 4);
 208 ASSERT_STATIC (sizeof (uint32_t) == 4);
 209 ASSERT_STATIC (sizeof (int64_t) == 8);
 210 ASSERT_STATIC (sizeof (uint64_t) == 8);
 211
 212 ASSERT_STATIC (sizeof (hb_codepoint_t) == 4);
 213 ASSERT_STATIC (sizeof (hb_position_t) == 4);
 214 ASSERT_STATIC (sizeof (hb_mask_t) == 4);
 215 ASSERT_STATIC (sizeof (hb_var_int_t) == 4);
 216
 217
 218 /* We like our types POD */
 219
 220 #define _ASSERT_TYPE_POD1(_line, _type) union _type_##_type##_on_line_##_line##_is_not_POD { _type instance; }
 221 #define _ASSERT_TYPE_POD0(_line, _type) _ASSERT_TYPE_POD1 (_line, _type)
 222 #define ASSERT_TYPE_POD(_type)          _ASSERT_TYPE_POD0 (__LINE__, _type)
 223
 224 #ifdef __GNUC__
 225 # define _ASSERT_INSTANCE_POD1(_line, _instance) \
 226         HB_STMT_START { \
 227                 typedef __typeof__(_instance) _type_##_line; \
 228                 _ASSERT_TYPE_POD1 (_line, _type_##_line); \
 229         } HB_STMT_END
 230 #else
 231 # define _ASSERT_INSTANCE_POD1(_line, _instance)        typedef int _assertion_on_line_##_line##_not_tested
 232 #endif
 233 # define _ASSERT_INSTANCE_POD0(_line, _instance)        _ASSERT_INSTANCE_POD1 (_line, _instance)
 234 # define ASSERT_INSTANCE_POD(_instance)                 _ASSERT_INSTANCE_POD0 (__LINE__, _instance)
 235
 236 /* Check _assertion in a method environment */
 237 #define _ASSERT_POD1(_line) \
 238         HB_UNUSED inline void _static_assertion_on_line_##_line (void) const \
 239         { _ASSERT_INSTANCE_POD1 (_line, *this); /* Make sure it's POD. */ }
 240 # define _ASSERT_POD0(_line)    _ASSERT_POD1 (_line)
 241 # define ASSERT_POD()           _ASSERT_POD0 (__LINE__)
 242
 243
 244
 245 /* Misc */
 246
 247 /* Void! */
 248 struct _hb_void_t {};
 249 typedef const _hb_void_t &hb_void_t;
 250 #define HB_VOID (* (const _hb_void_t *) NULL)
 251
 252 /* Return the number of 1 bits in mask. */
 253 static inline HB_CONST_FUNC unsigned int
 254 _hb_popcount32 (uint32_t mask)
 255 {
 256 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
 257   return __builtin_popcount (mask);
 258 #else
 259   /* "HACKMEM 169" */
 260   uint32_t y;
 261   y = (mask >> 1) &033333333333;
 262   y = mask - y - ((y >>1) & 033333333333);
 263   return (((y + (y >> 3)) & 030707070707) % 077);
 264 #endif
 265 }
 266
 267 /* Returns the number of bits needed to store number */
 268 static inline HB_CONST_FUNC unsigned int
 269 _hb_bit_storage (unsigned int number)
 270 {
 271 #if defined(__GNUC__) && (__GNUC__ >= 4) && defined(__OPTIMIZE__)
 272   return likely (number) ? (sizeof (unsigned int) * 8 - __builtin_clz (number)) : 0;
 273 #else
 274   unsigned int n_bits = 0;
 275   while (number) {
 276     n_bits++;
 277     number >>= 1;
 278   }
 279   return n_bits;
 280 #endif
 281 }
 282
 283 /* Returns the number of zero bits in the least significant side of number */
 284 static inline HB_CONST_FUNC unsigned int
 285 _hb_ctz (unsigned int number)
 286 {
 287 #if defined(__GNUC__) && (__GNUC__ >= 4) && defined(__OPTIMIZE__)
 288   return likely (number) ? __builtin_ctz (number) : 0;
 289 #else
 290   unsigned int n_bits = 0;
 291   if (unlikely (!number)) return 0;
 292   while (!(number & 1)) {
 293     n_bits++;
 294     number >>= 1;
 295   }
 296   return n_bits;
 297 #endif
 298 }
 299
 300 static inline bool
 301 _hb_unsigned_int_mul_overflows (unsigned int count, unsigned int size)
 302 {
 303   return (size > 0) && (count >= ((unsigned int) -1) / size);
 304 }
 305
 306
 307 /* Type of bsearch() / qsort() compare function */
 308 typedef int (*hb_compare_func_t) (const void *, const void *);
 309
 310
 311
 312
 313 /* arrays and maps */
 314
 315
 316 #define HB_PREALLOCED_ARRAY_INIT {0, 0, NULL}
 317 template <typename Type, unsigned int StaticSize=16>
 318 struct hb_prealloced_array_t
 319 {
 320   unsigned int len;
 321   unsigned int allocated;
 322   Type *array;
 323   Type static_array[StaticSize];
 324
 325   void init (void) { memset (this, 0, sizeof (*this)); }
 326
 327   inline Type& operator [] (unsigned int i) { return array[i]; }
 328   inline const Type& operator [] (unsigned int i) const { return array[i]; }
 329
 330   inline Type *push (void)
 331   {
 332     if (!array) {
 333       array = static_array;
 334       allocated = ARRAY_LENGTH (static_array);
 335     }
 336     if (likely (len < allocated))
 337       return &array[len++];
 338
 339     /* Need to reallocate */
 340     unsigned int new_allocated = allocated + (allocated >> 1) + 8;
 341     Type *new_array = NULL;
 342
 343     if (array == static_array) {
 344       new_array = (Type *) calloc (new_allocated, sizeof (Type));
 345       if (new_array)
 346         memcpy (new_array, array, len * sizeof (Type));
 347     } else {
 348       bool overflows = (new_allocated < allocated) || _hb_unsigned_int_mul_overflows (new_allocated, sizeof (Type));
 349       if (likely (!overflows)) {
 350         new_array = (Type *) realloc (array, new_allocated * sizeof (Type));
 351       }
 352     }
 353
 354     if (unlikely (!new_array))
 355       return NULL;
 356
 357     array = new_array;
 358     allocated = new_allocated;
 359     return &array[len++];
 360   }
 361
 362   inline void pop (void)
 363   {
 364     len--;
 365   }
 366
 367   inline void remove (unsigned int i)
 368   {
 369      if (unlikely (i >= len))
 370        return;
 371      memmove (static_cast<void *> (&array[i]),
 372               static_cast<void *> (&array[i + 1]),
 373               (len - i - 1) * sizeof (Type));
 374      len--;
 375   }
 376
 377   inline void shrink (unsigned int l)
 378   {
 379      if (l < len)
 380        len = l;
 381   }
 382
 383   template <typename T>
 384   inline Type *find (T v) {
 385     for (unsigned int i = 0; i < len; i++)
 386       if (array[i] == v)
 387         return &array[i];
 388     return NULL;
 389   }
 390   template <typename T>
 391   inline const Type *find (T v) const {
 392     for (unsigned int i = 0; i < len; i++)
 393       if (array[i] == v)
 394         return &array[i];
 395     return NULL;
 396   }
 397
 398   inline void qsort (void)
 399   {
 400     ::qsort (array, len, sizeof (Type), (hb_compare_func_t) Type::cmp);
 401   }
 402
 403   inline void qsort (unsigned int start, unsigned int end)
 404   {
 405     ::qsort (array + start, end - start, sizeof (Type), (hb_compare_func_t) Type::cmp);
 406   }
 407
 408   template <typename T>
 409   inline Type *bsearch (T *key)
 410   {
 411     return (Type *) ::bsearch (key, array, len, sizeof (Type), (hb_compare_func_t) Type::cmp);
 412   }
 413   template <typename T>
 414   inline const Type *bsearch (T *key) const
 415   {
 416     return (const Type *) ::bsearch (key, array, len, sizeof (Type), (hb_compare_func_t) Type::cmp);
 417   }
 418
 419   inline void finish (void)
 420   {
 421     if (array != static_array)
 422       free (array);
 423     array = NULL;
 424     allocated = len = 0;
 425   }
 426 };
 427
 428 template <typename Type>
 429 struct hb_auto_array_t : hb_prealloced_array_t <Type>
 430 {
 431   hb_auto_array_t (void) { hb_prealloced_array_t<Type>::init (); }
 432   ~hb_auto_array_t (void) { hb_prealloced_array_t<Type>::finish (); }
 433 };
 434
 435
 436 #define HB_LOCKABLE_SET_INIT {HB_PREALLOCED_ARRAY_INIT}
 437 template <typename item_t, typename lock_t>
 438 struct hb_lockable_set_t
 439 {
 440   hb_prealloced_array_t <item_t, 2> items;
 441
 442   inline void init (void) { items.init (); }
 443
 444   template <typename T>
 445   inline item_t *replace_or_insert (T v, lock_t &l, bool replace)
 446   {
 447     l.lock ();
 448     item_t *item = items.find (v);
 449     if (item) {
 450       if (replace) {
 451         item_t old = *item;
 452         *item = v;
 453         l.unlock ();
 454         old.finish ();
 455       }
 456       else {
 457         item = NULL;
 458         l.unlock ();
 459       }
 460     } else {
 461       item = items.push ();
 462       if (likely (item))
 463         *item = v;
 464       l.unlock ();
 465     }
 466     return item;
 467   }
 468
 469   template <typename T>
 470   inline void remove (T v, lock_t &l)
 471   {
 472     l.lock ();
 473     item_t *item = items.find (v);
 474     if (item) {
 475       item_t old = *item;
 476       *item = items[items.len - 1];
 477       items.pop ();
 478       l.unlock ();
 479       old.finish ();
 480     } else {
 481       l.unlock ();
 482     }
 483   }
 484
 485   template <typename T>
 486   inline bool find (T v, item_t *i, lock_t &l)
 487   {
 488     l.lock ();
 489     item_t *item = items.find (v);
 490     if (item)
 491       *i = *item;
 492     l.unlock ();
 493     return !!item;
 494   }
 495
 496   template <typename T>
 497   inline item_t *find_or_insert (T v, lock_t &l)
 498   {
 499     l.lock ();
 500     item_t *item = items.find (v);
 501     if (!item) {
 502       item = items.push ();
 503       if (likely (item))
 504         *item = v;
 505     }
 506     l.unlock ();
 507     return item;
 508   }
 509
 510   inline void finish (lock_t &l)
 511   {
 512     if (!items.len) {
 513       /* No need for locking. */
 514       items.finish ();
 515       return;
 516     }
 517     l.lock ();
 518     while (items.len) {
 519       item_t old = items[items.len - 1];
 520         items.pop ();
 521         l.unlock ();
 522         old.finish ();
 523         l.lock ();
 524     }
 525     items.finish ();
 526     l.unlock ();
 527   }
 528
 529 };
 530
 531
 532 /* ASCII tag/character handling */
 533
 534 static inline bool ISALPHA (unsigned char c)
 535 { return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'); }
 536 static inline bool ISALNUM (unsigned char c)
 537 { return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9'); }
 538 static inline bool ISSPACE (unsigned char c)
 539 { return c == ' ' || c =='\f'|| c =='\n'|| c =='\r'|| c =='\t'|| c =='\v'; }
 540 static inline unsigned char TOUPPER (unsigned char c)
 541 { return (c >= 'a' && c <= 'z') ? c - 'a' + 'A' : c; }
 542 static inline unsigned char TOLOWER (unsigned char c)
 543 { return (c >= 'A' && c <= 'Z') ? c - 'A' + 'a' : c; }
 544
 545 #define HB_TAG_CHAR4(s)   (HB_TAG(((const char *) s)[0], \
 546                                   ((const char *) s)[1], \
 547                                   ((const char *) s)[2], \
 548                                   ((const char *) s)[3]))
 549
 550
 551 /* C++ helpers */
 552
 553 /* Makes class uncopyable.  Use in private: section. */
 554 #define NO_COPY(T) \
 555   T (const T &o); \
 556   T &operator = (const T &o)
 557
 558
 559 /* Debug */
 560
 561
 562 #ifndef HB_DEBUG
 563 #define HB_DEBUG 0
 564 #endif
 565
 566 static inline bool
 567 _hb_debug (unsigned int level,
 568            unsigned int max_level)
 569 {
 570   return level < max_level;
 571 }
 572
 573 #define DEBUG_LEVEL_ENABLED(WHAT, LEVEL) (_hb_debug ((LEVEL), HB_DEBUG_##WHAT))
 574 #define DEBUG_ENABLED(WHAT) (DEBUG_LEVEL_ENABLED (WHAT, 0))
 575
 576 static inline void
 577 _hb_print_func (const char *func)
 578 {
 579   if (func)
 580   {
 581     unsigned int func_len = strlen (func);
 582     /* Skip "static" */
 583     if (0 == strncmp (func, "static ", 7))
 584       func += 7;
 585     /* Skip "typename" */
 586     if (0 == strncmp (func, "typename ", 9))
 587       func += 9;
 588     /* Skip return type */
 589     const char *space = strchr (func, ' ');
 590     if (space)
 591       func = space + 1;
 592     /* Skip parameter list */
 593     const char *paren = strchr (func, '(');
 594     if (paren)
 595       func_len = paren - func;
 596     fprintf (stderr, "%.*s", func_len, func);
 597   }
 598 }
 599
 600 template <int max_level> static inline void
 601 _hb_debug_msg_va (const char *what,
 602                   const void *obj,
 603                   const char *func,
 604                   bool indented,
 605                   unsigned int level,
 606                   int level_dir,
 607                   const char *message,
 608                   va_list ap) HB_PRINTF_FUNC(7, 0);
 609 template <int max_level> static inline void
 610 _hb_debug_msg_va (const char *what,
 611                   const void *obj,
 612                   const char *func,
 613                   bool indented,
 614                   unsigned int level,
 615                   int level_dir,
 616                   const char *message,
 617                   va_list ap)
 618 {
 619   if (!_hb_debug (level, max_level))
 620     return;
 621
 622   fprintf (stderr, "%-10s", what ? what : "");
 623
 624   if (obj)
 625     fprintf (stderr, "(%0*lx) ", (unsigned int) (2 * sizeof (void *)), (unsigned long) obj);
 626   else
 627     fprintf (stderr, " %*s  ", (unsigned int) (2 * sizeof (void *)), "");
 628
 629   if (indented) {
 630 /* One may want to add ASCII version of these.  See:
 631  * https://bugs.freedesktop.org/show_bug.cgi?id=50970 */
 632 #define VBAR    "\342\224\202"  /* U+2502 BOX DRAWINGS LIGHT VERTICAL */
 633 #define VRBAR   "\342\224\234"  /* U+251C BOX DRAWINGS LIGHT VERTICAL AND RIGHT */
 634 #define DLBAR   "\342\225\256"  /* U+256E BOX DRAWINGS LIGHT ARC DOWN AND LEFT */
 635 #define ULBAR   "\342\225\257"  /* U+256F BOX DRAWINGS LIGHT ARC UP AND LEFT */
 636 #define LBAR    "\342\225\264"  /* U+2574 BOX DRAWINGS LIGHT LEFT */
 637     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;
 638     fprintf (stderr, "%2u %s" VRBAR "%s",
 639              level,
 640              bars + sizeof (bars) - 1 - MIN ((unsigned int) sizeof (bars), (unsigned int) (sizeof (VBAR) - 1) * level),
 641              level_dir ? (level_dir > 0 ? DLBAR : ULBAR) : LBAR);
 642   } else
 643     fprintf (stderr, "   " VRBAR LBAR);
 644
 645   _hb_print_func (func);
 646
 647   if (message)
 648   {
 649     fprintf (stderr, ": ");
 650     vfprintf (stderr, message, ap);
 651   }
 652
 653   fprintf (stderr, "\n");
 654 }
 655 template <> inline void
 656 _hb_debug_msg_va<0> (const char *what HB_UNUSED,
 657                      const void *obj HB_UNUSED,
 658                      const char *func HB_UNUSED,
 659                      bool indented HB_UNUSED,
 660                      unsigned int level HB_UNUSED,
 661                      int level_dir HB_UNUSED,
 662                      const char *message HB_UNUSED,
 663                      va_list ap HB_UNUSED) {}
 664
 665 template <int max_level> static inline void
 666 _hb_debug_msg (const char *what,
 667                const void *obj,
 668                const char *func,
 669                bool indented,
 670                unsigned int level,
 671                int level_dir,
 672                const char *message,
 673                ...) HB_PRINTF_FUNC(7, 8);
 674 template <int max_level> static inline void
 675 _hb_debug_msg (const char *what,
 676                const void *obj,
 677                const char *func,
 678                bool indented,
 679                unsigned int level,
 680                int level_dir,
 681                const char *message,
 682                ...)
 683 {
 684   va_list ap;
 685   va_start (ap, message);
 686   _hb_debug_msg_va<max_level> (what, obj, func, indented, level, level_dir, message, ap);
 687   va_end (ap);
 688 }
 689 template <> inline void
 690 _hb_debug_msg<0> (const char *what HB_UNUSED,
 691                   const void *obj HB_UNUSED,
 692                   const char *func HB_UNUSED,
 693                   bool indented HB_UNUSED,
 694                   unsigned int level HB_UNUSED,
 695                   int level_dir HB_UNUSED,
 696                   const char *message HB_UNUSED,
 697                   ...) HB_PRINTF_FUNC(7, 8);
 698 template <> inline void
 699 _hb_debug_msg<0> (const char *what HB_UNUSED,
 700                   const void *obj HB_UNUSED,
 701                   const char *func HB_UNUSED,
 702                   bool indented HB_UNUSED,
 703                   unsigned int level HB_UNUSED,
 704                   int level_dir HB_UNUSED,
 705                   const char *message HB_UNUSED,
 706                   ...) {}
 707
 708 #define DEBUG_MSG_LEVEL(WHAT, OBJ, LEVEL, LEVEL_DIR, ...)       _hb_debug_msg<HB_DEBUG_##WHAT> (#WHAT, (OBJ), NULL,    true, (LEVEL), (LEVEL_DIR), __VA_ARGS__)
 709 #define DEBUG_MSG(WHAT, OBJ, ...)                               _hb_debug_msg<HB_DEBUG_##WHAT> (#WHAT, (OBJ), NULL,    false, 0, 0, __VA_ARGS__)
 710 #define DEBUG_MSG_FUNC(WHAT, OBJ, ...)                          _hb_debug_msg<HB_DEBUG_##WHAT> (#WHAT, (OBJ), HB_FUNC, false, 0, 0, __VA_ARGS__)
 711
 712
 713 /*
 714  * Printer
 715  */
 716
 717 template <typename T>
 718 struct hb_printer_t {
 719   const char *print (const T&) { return "something"; }
 720 };
 721
 722 template <>
 723 struct hb_printer_t<bool> {
 724   const char *print (bool v) { return v ? "true" : "false"; }
 725 };
 726
 727 template <>
 728 struct hb_printer_t<hb_void_t> {
 729   const char *print (hb_void_t) { return ""; }
 730 };
 731
 732
 733 /*
 734  * Trace
 735  */
 736
 737 template <typename T>
 738 static inline void _hb_warn_no_return (bool returned)
 739 {
 740   if (unlikely (!returned)) {
 741     fprintf (stderr, "OUCH, returned with no call to TRACE_RETURN.  This is a bug, please report.\n");
 742   }
 743 }
 744 template <>
 745 /*static*/ inline void _hb_warn_no_return<hb_void_t> (bool returned HB_UNUSED)
 746 {}
 747
 748 template <int max_level, typename ret_t>
 749 struct hb_auto_trace_t {
 750   explicit inline hb_auto_trace_t (unsigned int *plevel_,
 751                                    const char *what_,
 752                                    const void *obj_,
 753                                    const char *func,
 754                                    const char *message,
 755                                    ...) : plevel (plevel_), what (what_), obj (obj_), returned (false)
 756   {
 757     if (plevel) ++*plevel;
 758
 759     va_list ap;
 760     va_start (ap, message);
 761     _hb_debug_msg_va<max_level> (what, obj, func, true, plevel ? *plevel : 0, +1, message, ap);
 762     va_end (ap);
 763   }
 764   inline ~hb_auto_trace_t (void)
 765   {
 766     _hb_warn_no_return<ret_t> (returned);
 767     if (!returned) {
 768       _hb_debug_msg<max_level> (what, obj, NULL, true, plevel ? *plevel : 1, -1, " ");
 769     }
 770     if (plevel) --*plevel;
 771   }
 772
 773   inline ret_t ret (ret_t v, unsigned int line = 0)
 774   {
 775     if (unlikely (returned)) {
 776       fprintf (stderr, "OUCH, double calls to TRACE_RETURN.  This is a bug, please report.\n");
 777       return v;
 778     }
 779
 780     _hb_debug_msg<max_level> (what, obj, NULL, true, plevel ? *plevel : 1, -1,
 781                               "return %s (line %d)",
 782                               hb_printer_t<ret_t>().print (v), line);
 783     if (plevel) --*plevel;
 784     plevel = NULL;
 785     returned = true;
 786     return v;
 787   }
 788
 789   private:
 790   unsigned int *plevel;
 791   const char *what;
 792   const void *obj;
 793   bool returned;
 794 };
 795 template <typename ret_t> /* Optimize when tracing is disabled */
 796 struct hb_auto_trace_t<0, ret_t> {
 797   explicit inline hb_auto_trace_t (unsigned int *plevel_ HB_UNUSED,
 798                                    const char *what HB_UNUSED,
 799                                    const void *obj HB_UNUSED,
 800                                    const char *func HB_UNUSED,
 801                                    const char *message HB_UNUSED,
 802                                    ...) {}
 803
 804   inline ret_t ret (ret_t v, unsigned int line HB_UNUSED = 0) { return v; }
 805 };
 806
 807 #define TRACE_RETURN(RET) trace.ret (RET, __LINE__)
 808
 809 /* Misc */
 810
 811 template <typename T> class hb_assert_unsigned_t;
 812 template <> class hb_assert_unsigned_t<unsigned char> {};
 813 template <> class hb_assert_unsigned_t<unsigned short> {};
 814 template <> class hb_assert_unsigned_t<unsigned int> {};
 815 template <> class hb_assert_unsigned_t<unsigned long> {};
 816
 817 template <typename T> static inline bool
 818 hb_in_range (T u, T lo, T hi)
 819 {
 820   /* The sizeof() is here to force template instantiation.
 821    * I'm sure there are better ways to do this but can't think of
 822    * one right now.  Declaring a variable won't work as HB_UNUSED
 823    * is unusable on some platforms and unused types are less likely
 824    * to generate a warning than unused variables. */
 825   ASSERT_STATIC (sizeof (hb_assert_unsigned_t<T>) >= 0);
 826
 827   /* The casts below are important as if T is smaller than int,
 828    * the subtract results will become a signed int! */
 829   return (T)(u - lo) <= (T)(hi - lo);
 830 }
 831
 832 template <typename T> static inline bool
 833 hb_in_ranges (T u, T lo1, T hi1, T lo2, T hi2)
 834 {
 835   return hb_in_range (u, lo1, hi1) || hb_in_range (u, lo2, hi2);
 836 }
 837
 838 template <typename T> static inline bool
 839 hb_in_ranges (T u, T lo1, T hi1, T lo2, T hi2, T lo3, T hi3)
 840 {
 841   return hb_in_range (u, lo1, hi1) || hb_in_range (u, lo2, hi2) || hb_in_range (u, lo3, hi3);
 842 }
 843
 844
 845 /* Useful for set-operations on small enums.
 846  * For example, for testing "x ∈ {x1, x2, x3}" use:
 847  * (FLAG(x) & (FLAG(x1) | FLAG(x2) | FLAG(x3)))
 848  */
 849 #define FLAG(x) (1<<(x))
 850 #define FLAG_RANGE(x,y) (ASSERT_STATIC_EXPR_ZERO ((x) < (y)) + FLAG(y+1) - FLAG(x))
 851
 852
 853 template <typename T, typename T2> static inline void
 854 hb_bubble_sort (T *array, unsigned int len, int(*compar)(const T *, const T *), T2 *array2)
 855 {
 856   if (unlikely (!len))
 857     return;
 858
 859   unsigned int k = len - 1;
 860   do {
 861     unsigned int new_k = 0;
 862
 863     for (unsigned int j = 0; j < k; j++)
 864       if (compar (&array[j], &array[j+1]) > 0)
 865       {
 866         {
 867           T t;
 868           t = array[j];
 869           array[j] = array[j + 1];
 870           array[j + 1] = t;
 871         }
 872         if (array2)
 873         {
 874           T2 t;
 875           t = array2[j];
 876           array2[j] = array2[j + 1];
 877           array2[j + 1] = t;
 878         }
 879
 880         new_k = j;
 881       }
 882     k = new_k;
 883   } while (k);
 884 }
 885
 886 template <typename T> static inline void
 887 hb_bubble_sort (T *array, unsigned int len, int(*compar)(const T *, const T *))
 888 {
 889   hb_bubble_sort (array, len, compar, (int *) NULL);
 890 }
 891
 892 static inline hb_bool_t
 893 hb_codepoint_parse (const char *s, unsigned int len, int base, hb_codepoint_t *out)
 894 {
 895   /* Pain because we don't know whether s is nul-terminated. */
 896   char buf[64];
 897   len = MIN (ARRAY_LENGTH (buf) - 1, len);
 898   strncpy (buf, s, len);
 899   buf[len] = '\0';
 900
 901   char *end;
 902   errno = 0;
 903   unsigned long v = strtoul (buf, &end, base);
 904   if (errno) return false;
 905   if (*end) return false;
 906   *out = v;
 907   return true;
 908 }
 909
 910
 911 /* Global runtime options. */
 912
 913 struct hb_options_t
 914 {
 915   unsigned int initialized : 1;
 916   unsigned int uniscribe_bug_compatible : 1;
 917 };
 918
 919 union hb_options_union_t {
 920   unsigned int i;
 921   hb_options_t opts;
 922 };
 923 ASSERT_STATIC (sizeof (int) == sizeof (hb_options_union_t));
 924
 925 HB_INTERNAL void
 926 _hb_options_init (void);
 927
 928 extern HB_INTERNAL hb_options_union_t _hb_options;
 929
 930 static inline hb_options_t
 931 hb_options (void)
 932 {
 933   if (unlikely (!_hb_options.i))
 934     _hb_options_init ();
 935
 936   return _hb_options.opts;
 937 }
 938
 939
 940 #endif /* HB_PRIVATE_HH */