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Add hb-string-array.hh 

Used to build static string arrays that use no relocation.
This commit is contained in:
Behdad Esfahbod 2017-10-26 19:48:33 -06:00
parent 6f08b12bc3
commit 2a74968044
3 changed files with 79 additions and 2 deletions
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1
src/Makefile.sources
View File

@ -39,6 +39,7 @@ HB_BASE_sources = \
hb-shaper-impl-private.hh \
hb-shaper-private.hh \
hb-shaper.cc \
hb-string-array.hh \
hb-unicode-private.hh \
hb-unicode.cc \
hb-utf-private.hh \

6
src/hb-private.hh
View File

@ -54,6 +54,10 @@
#include <stdarg.h>
#define HB_PASTE1(a,b) a##b
#define HB_PASTE(a,b) HB_PASTE1(a,b)
/* Compile-time custom allocator support. */
#if defined(hb_malloc_impl) \
@ -98,8 +102,6 @@ private:
// Static assertions
#ifndef static_assert
#define HB_PASTE1(a,b) a##b
#define HB_PASTE(a,b) HB_PASTE1(a,b)
#define static_assert(e, msg) \
HB_UNUSED typedef int HB_PASTE(static_assertion_failed_at_line_, __LINE__) [(e) ? 1 : -1]
#endif // static_assert

74
src/hb-string-array.hh Normal file
View File

@ -0,0 +1,74 @@
/*
* Copyright © 2017 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.
*
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_STRING_ARRAY_HH
#if 0 /* Make checks happy. */
#define HB_STRING_ARRAY_HH
#endif
#include "hb-private.hh"
/* Based on Bruno Haible's code in Appendix B of Ulrich Drepper's dsohowto.pdf:
* https://software.intel.com/sites/default/files/m/a/1/e/dsohowto.pdf */
#define HB_STRING_ARRAY_TYPE_NAME HB_PASTE(HB_STRING_ARRAY_NAME, _msgstr_t)
#define HB_STRING_ARRAY_POOL_NAME HB_PASTE(HB_STRING_ARRAY_NAME, _msgstr)
#define HB_STRING_ARRAY_OFFS_NAME HB_PASTE(HB_STRING_ARRAY_NAME, _msgidx)
static const union HB_STRING_ARRAY_TYPE_NAME {
struct {
#define _S(s) char HB_PASTE (str, __LINE__)[sizeof (s)];
#include HB_STRING_ARRAY_LIST
#undef _S
} st;
char str[0];
}
HB_STRING_ARRAY_POOL_NAME =
{
{
#define _S(s) s,
#include HB_STRING_ARRAY_LIST
#undef _S
}
};
static const unsigned int HB_STRING_ARRAY_OFFS_NAME[] =
{
#define _S(s) offsetof (union HB_STRING_ARRAY_TYPE_NAME, st.HB_PASTE(str, __LINE__)),
#include HB_STRING_ARRAY_LIST
#undef _S
};
static inline const char *
HB_STRING_ARRAY_NAME (unsigned int i)
{
return HB_STRING_ARRAY_POOL_NAME.str + HB_STRING_ARRAY_OFFS_NAME[i];
}
#undef HB_STRING_ARRAY_TYPE_NAME
#undef HB_STRING_ARRAY_POOL_NAME
#undef HB_STRING_ARRAY_OFFS_NAME
#endif /* HB_STRING_ARRAY_HH */