Add stripped version of HarfBuzz-NG 0.9.19 sources to 3rdparty

Change-Id: I06fbf58131ebce51ce95921d8dfd65dd3d3e236f
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

1 files changed, 909 insertions, 0 deletions

diff --git a/src/3rdparty/harfbuzz-ng/src/hb-private.hh b/src/3rdparty/harfbuzz-ng/src/hb-private.hh
new file mode 100644
index 0000000000..4152e27552
--- /dev/null
+++ b/src/3rdparty/harfbuzz-ng/src/hb-private.hh
@@ -0,0 +1,909 @@
+/*
+ * Copyright © 2007,2008,2009  Red Hat, Inc.
+ * Copyright © 2011,2012  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * 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
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_PRIVATE_HH
+#define HB_PRIVATE_HH
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "hb.h"
+#define HB_H_IN
+#ifdef HAVE_OT
+#include "hb-ot.h"
+#define HB_OT_H_IN
+#endif
+
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <assert.h>
+
+/* 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>
+
+
+
+/* Essentials */
+
+#ifndef NULL
+# define NULL ((void *) 0)
+#endif
+
+
+/* Void! */
+struct _hb_void_t {};
+typedef const _hb_void_t &hb_void_t;
+#define HB_VOID (* (const _hb_void_t *) NULL)
+
+
+/* Basics */
+
+
+#undef MIN
+template <typename Type>
+static inline Type MIN (const Type &a, const Type &b) { return a < b ? a : b; }
+
+#undef MAX
+template <typename Type>
+static inline Type MAX (const Type &a, const Type &b) { return a > b ? a : b; }
+
+
+#undef  ARRAY_LENGTH
+template <typename Type, unsigned int n>
+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])))
+
+#define HB_STMT_START do
+#define HB_STMT_END   while (0)
+
+#define _ASSERT_STATIC1(_line, _cond)	typedef int _static_assert_on_line_##_line##_failed[(_cond)?1:-1]
+#define _ASSERT_STATIC0(_line, _cond)	_ASSERT_STATIC1 (_line, (_cond))
+#define ASSERT_STATIC(_cond)		_ASSERT_STATIC0 (__LINE__, (_cond))
+
+#define ASSERT_STATIC_EXPR(_cond)((void) sizeof (char[(_cond) ? 1 : -1]))
+#define ASSERT_STATIC_EXPR_ZERO(_cond) (0 * sizeof (char[(_cond) ? 1 : -1]))
+
+#define _PASTE1(a,b) a##b
+#define PASTE(a,b) _PASTE1(a,b)
+
+/* 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);
+
+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);
+
+
+/* We like our types POD */
+
+#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)
+
+#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
+#else
+# define _ASSERT_INSTANCE_POD1(_line, _instance)	typedef int _assertion_on_line_##_line##_not_tested
+#endif
+# define _ASSERT_INSTANCE_POD0(_line, _instance)	_ASSERT_INSTANCE_POD1 (_line, _instance)
+# define ASSERT_INSTANCE_POD(_instance)			_ASSERT_INSTANCE_POD0 (__LINE__, _instance)
+
+/* Check _assertion in a method environment */
+#define _ASSERT_POD1(_line) \
+	inline void _static_assertion_on_line_##_line (void) const \
+	{ _ASSERT_INSTANCE_POD1 (_line, *this); /* Make sure it's POD. */ }
+# define _ASSERT_POD0(_line)	_ASSERT_POD1 (_line)
+# define ASSERT_POD()		_ASSERT_POD0 (__LINE__)
+
+
+
+/* Misc */
+
+
+#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)
+#endif
+
+#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
+# ifndef __MINGW32__
+#  define HB_INTERNAL __attribute__((__visibility__("hidden")))
+# else
+#  define HB_INTERNAL
+# endif
+#endif
+
+
+#if (defined(__WIN32__) && !defined(__WINE__)) || defined(_MSC_VER)
+#define snprintf _snprintf
+#endif
+
+#ifdef _MSC_VER
+#undef inline
+#define inline __inline
+#endif
+
+#ifdef __STRICT_ANSI__
+#undef inline
+#define inline __inline__
+#endif
+
+
+#if __GNUC__ >= 3
+#define HB_FUNC __PRETTY_FUNCTION__
+#elif defined(_MSC_VER)
+#define HB_FUNC __FUNCSIG__
+#else
+#define HB_FUNC __func__
+#endif
+
+
+/* Return the number of 1 bits in mask. */
+static inline HB_CONST_FUNC unsigned int
+_hb_popcount32 (uint32_t mask)
+{
+#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
+  return __builtin_popcount (mask);
+#else
+  /* "HACKMEM 169" */
+  register uint32_t y;
+  y = (mask >> 1) &033333333333;
+  y = mask - y - ((y >>1) & 033333333333);
+  return (((y + (y >> 3)) & 030707070707) % 077);
+#endif
+}
+
+/* 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;
+#else
+  register unsigned int n_bits = 0;
+  while (number) {
+    n_bits++;
+    number >>= 1;
+  }
+  return n_bits;
+#endif
+}
+
+/* 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
+  register unsigned int n_bits = 0;
+  if (unlikely (!number)) return 0;
+  while (!(number & 1)) {
+    n_bits++;
+    number >>= 1;
+  }
+  return n_bits;
+#endif
+}
+
+static inline bool
+_hb_unsigned_int_mul_overflows (unsigned int count, unsigned int size)
+{
+  return (size > 0) && (count >= ((unsigned int) -1) / size);
+}
+
+
+/* Type of bsearch() / qsort() compare function */
+typedef int (*hb_compare_func_t) (const void *, const void *);
+
+
+
+
+/* arrays and maps */
+
+
+#define HB_PREALLOCED_ARRAY_INIT {0}
+template <typename Type, unsigned int StaticSize>
+struct hb_prealloced_array_t
+{
+  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]; }
+
+  inline Type *push (void)
+  {
+    if (!array) {
+      array = static_array;
+      allocated = ARRAY_LENGTH (static_array);
+    }
+    if (likely (len < allocated))
+      return &array[len++];
+
+    /* Need to reallocate */
+    unsigned int new_allocated = allocated + (allocated >> 1) + 8;
+    Type *new_array = NULL;
+
+    if (array == static_array) {
+      new_array = (Type *) calloc (new_allocated, sizeof (Type));
+      if (new_array)
+        memcpy (new_array, array, len * sizeof (Type));
+    } else {
+      bool overflows = (new_allocated < allocated) || _hb_unsigned_int_mul_overflows (new_allocated, sizeof (Type));
+      if (likely (!overflows)) {
+	new_array = (Type *) realloc (array, new_allocated * sizeof (Type));
+      }
+    }
+
+    if (unlikely (!new_array))
+      return NULL;
+
+    array = new_array;
+    allocated = new_allocated;
+    return &array[len++];
+  }
+
+  inline void pop (void)
+  {
+    len--;
+  }
+
+  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--;
+  }
+
+  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 sort (void)
+  {
+    qsort (array, len, sizeof (Type), (hb_compare_func_t) Type::cmp);
+  }
+
+  inline void sort (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);
+  }
+
+  inline void finish (void)
+  {
+    if (array != static_array)
+      free (array);
+    array = NULL;
+    allocated = len = 0;
+  }
+};
+
+#define HB_AUTO_ARRAY_PREALLOCED 16
+template <typename Type>
+struct hb_auto_array_t : hb_prealloced_array_t <Type, HB_AUTO_ARRAY_PREALLOCED>
+{
+  hb_auto_array_t (void) { hb_prealloced_array_t<Type, HB_AUTO_ARRAY_PREALLOCED>::init (); }
+  ~hb_auto_array_t (void) { hb_prealloced_array_t<Type, HB_AUTO_ARRAY_PREALLOCED>::finish (); }
+};
+
+
+#define HB_LOCKABLE_SET_INIT {HB_PREALLOCED_ARRAY_INIT}
+template <typename item_t, typename lock_t>
+struct hb_lockable_set_t
+{
+  hb_prealloced_array_t <item_t, 2> items;
+
+  inline void init (void) { items.init (); }
+
+  template <typename T>
+  inline item_t *replace_or_insert (T v, lock_t &l, bool replace)
+  {
+    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 {
+      item = items.push ();
+      if (likely (item))
+	*item = v;
+      l.unlock ();
+    }
+    return item;
+  }
+
+  template <typename T>
+  inline void remove (T v, lock_t &l)
+  {
+    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 ();
+    }
+  }
+
+  template <typename T>
+  inline bool find (T v, item_t *i, lock_t &l)
+  {
+    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 ();
+    }
+    items.finish ();
+    l.unlock ();
+  }
+
+};
+
+
+
+
+/* Big-endian handling */
+
+static inline uint16_t hb_be_uint16 (const uint16_t v)
+{
+  const uint8_t *V = (const uint8_t *) &v;
+  return (V[0] << 8) | V[1];
+}
+
+static inline uint16_t hb_uint16_swap (const uint16_t v)
+{
+  return (v >> 8) | (v << 8);
+}
+
+static inline uint32_t hb_uint32_swap (const uint32_t v)
+{
+  return (hb_uint16_swap (v) << 16) | hb_uint16_swap (v >> 16);
+}
+
+/* Note, of the following macros, uint16_get is the one called many many times.
+ * If there is any optimizations to be done, it's in that macro.  However, I
+ * already confirmed that on my T400 ThinkPad at least, using bswap_16(), which
+ * results in a single ror instruction, does NOT speed this up.  In fact, it
+ * resulted in a minor slowdown.  At any rate, note that v may not be correctly
+ * aligned, so I think the current implementation is optimal.
+ */
+
+#define hb_be_uint16_put(v,V)	HB_STMT_START { v[0] = (V>>8); v[1] = (V); } HB_STMT_END
+#define hb_be_uint16_get(v)	(uint16_t) ((v[0] << 8) + v[1])
+#define hb_be_uint16_eq(a,b)	(a[0] == b[0] && a[1] == b[1])
+
+#define hb_be_uint32_put(v,V)	HB_STMT_START { v[0] = (V>>24); v[1] = (V>>16); v[2] = (V>>8); v[3] = (V); } HB_STMT_END
+#define hb_be_uint32_get(v)	(uint32_t) ((v[0] << 24) + (v[1] << 16) + (v[2] << 8) + v[3])
+#define hb_be_uint32_eq(a,b)	(a[0] == b[0] && a[1] == b[1] && a[2] == b[2] && a[3] == b[3])
+
+#define hb_be_uint24_put(v,V)	HB_STMT_START { v[0] = (V>>16); v[1] = (V>>8); v[2] = (V); } HB_STMT_END
+#define hb_be_uint24_get(v)	(uint32_t) ((v[0] << 16) + (v[1] << 8) + v[2])
+#define hb_be_uint24_eq(a,b)	(a[0] == b[0] && a[1] == b[1] && a[2] == b[2])
+
+
+/* ASCII tag/character handling */
+
+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; }
+
+#define HB_TAG_CHAR4(s)   (HB_TAG(((const char *) s)[0], \
+				  ((const char *) s)[1], \
+				  ((const char *) s)[2], \
+				  ((const char *) s)[3]))
+
+
+/* C++ helpers */
+
+/* Makes class uncopyable.  Use in private: section. */
+#define NO_COPY(T) \
+  T (const T &o); \
+  T &operator = (const T &o)
+
+
+/* Debug */
+
+
+#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))
+
+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)
+{
+  if (!_hb_debug (level, max_level))
+    return;
+
+  fprintf (stderr, "%-10s", what ? what : "");
+
+  if (obj)
+    fprintf (stderr, "(%0*lx) ", (unsigned int) (2 * sizeof (void *)), (unsigned long) obj);
+  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",
+	     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);
+
+  if (func)
+  {
+    unsigned int func_len = strlen (func);
+#ifndef HB_DEBUG_VERBOSE
+    /* 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;
+#endif
+    fprintf (stderr, "%.*s: ", func_len, func);
+  }
+
+  if (message)
+    vfprintf (stderr, message, ap);
+
+  fprintf (stderr, "\n");
+}
+template <> inline void
+_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) {}
+
+template <int max_level> static inline void
+_hb_debug_msg (const char *what,
+	       const void *obj,
+	       const char *func,
+	       bool indented,
+	       unsigned int level,
+	       int level_dir,
+	       const char *message,
+	       ...) HB_PRINTF_FUNC(7, 8);
+template <int max_level> static inline void
+_hb_debug_msg (const char *what,
+	       const void *obj,
+	       const char *func,
+	       bool indented,
+	       unsigned int level,
+	       int level_dir,
+	       const char *message,
+	       ...)
+{
+  va_list ap;
+  va_start (ap, message);
+  _hb_debug_msg_va<max_level> (what, obj, func, indented, level, level_dir, message, ap);
+  va_end (ap);
+}
+template <> inline void
+_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,
+		  ...) HB_PRINTF_FUNC(7, 8);
+template <> inline void
+_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,
+		  ...) {}
+
+#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__)
+
+
+/*
+ * Printer
+ */
+
+template <typename T>
+struct hb_printer_t {};
+
+template <>
+struct hb_printer_t<bool> {
+  const char *print (bool v) { return v ? "true" : "false"; }
+};
+
+template <>
+struct hb_printer_t<hb_void_t> {
+  const char *print (hb_void_t) { return ""; }
+};
+
+
+/*
+ * Trace
+ */
+
+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 <>
+inline void _hb_warn_no_return<hb_void_t> (bool returned HB_UNUSED)
+{}
+
+template <int max_level, typename ret_t>
+struct hb_auto_trace_t {
+  explicit inline hb_auto_trace_t (unsigned int *plevel_,
+				   const char *what_,
+				   const void *obj_,
+				   const char *func,
+				   const char *message,
+				   ...) : plevel (plevel_), what (what_), obj (obj_), returned (false)
+  {
+    if (plevel) ++*plevel;
+
+    va_list ap;
+    va_start (ap, message);
+    _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)
+  {
+    _hb_warn_no_return<ret_t> (returned);
+    if (!returned) {
+      _hb_debug_msg<max_level> (what, obj, NULL, true, plevel ? *plevel : 1, -1, " ");
+    }
+    if (plevel) --*plevel;
+  }
+
+  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;
+    }
+
+    _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;
+  const char *what;
+  const void *obj;
+  bool returned;
+};
+template <typename ret_t> /* Optimize when tracing is disabled */
+struct hb_auto_trace_t<0, ret_t> {
+  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,
+				   ...) {}
+
+  inline ret_t ret (ret_t v, unsigned int line HB_UNUSED = 0) { return v; }
+};
+
+#define TRACE_RETURN(RET) trace.ret (RET, __LINE__)
+
+/* Misc */
+
+
+/* Pre-mature optimization:
+ * Checks for lo <= u <= hi but with an optimization if lo and hi
+ * are only different in a contiguous set of lower-most bits.
+ */
+template <typename T> static inline bool
+hb_in_range (T u, T lo, T hi)
+{
+  if ( ((lo^hi) & lo) == 0 &&
+       ((lo^hi) & hi) == (lo^hi) &&
+       ((lo^hi) & ((lo^hi) + 1)) == 0 )
+    return (u & ~(lo^hi)) == lo;
+  else
+    return lo <= u && u <= hi;
+}
+
+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);
+}
+
+
+/* Useful for set-operations on small enums.
+ * For example, for testing "x ∈ {x1, x2, x3}" use:
+ * (FLAG(x) & (FLAG(x1) | FLAG(x2) | FLAG(x3)))
+ */
+#define FLAG(x) (1<<(x))
+#define FLAG_RANGE(x,y) (ASSERT_STATIC_EXPR_ZERO ((x) < (y)) + FLAG(y+1) - FLAG(x))
+
+
+template <typename T, typename T2> 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);
+}
+
+template <typename T> inline void
+hb_bubble_sort (T *array, unsigned int len, int(*compar)(const T *, const T *))
+{
+  hb_bubble_sort (array, len, compar, (int *) NULL);
+}
+
+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';
+
+  char *end;
+  errno = 0;
+  unsigned long v = strtoul (buf, &end, base);
+  if (errno) return false;
+  if (*end) return false;
+  *out = v;
+  return true;
+}
+
+
+/* Global runtime options. */
+
+struct hb_options_t
+{
+  int initialized : 1;
+  int uniscribe_bug_compatible : 1;
+};
+
+union hb_options_union_t {
+  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 */