mfbt/Types.h
author Masayuki Nakano <masayuki@d-toybox.com>
Thu, 16 Mar 2017 16:26:43 +0900
changeset 398554 8e72178c3893c377972209cccd2e561e1ec06c7d
parent 324187 ee0b88d119191846e6bdf3a3b597c9f5a027f577
child 430104 a17a6af7ff937f4552d83017153ab6f4d7ffa7e3
permissions -rw-r--r--
Bug 1339331 TextEventDispatcher should replace \r in composition string with \n and TextComposition should allow to input \n with composition events r=m_kato According to ATOK's behavior, IME may send different line breaker from its platform's standard. Therefore, we should treat \r as \n too. Additionally, currently, TextComposition doesn't allow to input \n with composition. However, this was added for preventing to see odd control characters as boxes with code point. Therefore, we should allow \n for IMEs. (It was allowed, this limitation is unexpected when I reviewed the patch to reject control characters in TextComposition.) MozReview-Commit-ID: DzGSMgp89Av

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* mfbt foundational types and macros. */

#ifndef mozilla_Types_h
#define mozilla_Types_h

/*
 * This header must be valid C and C++, includable by code embedding either
 * SpiderMonkey or Gecko.
 */

/* Expose all <stdint.h> types and size_t. */
#include <stddef.h>
#include <stdint.h>

/* Implement compiler and linker macros needed for APIs. */

/*
 * MOZ_EXPORT is used to declare and define a symbol or type which is externally
 * visible to users of the current library.  It encapsulates various decorations
 * needed to properly export the method's symbol.
 *
 *   api.h:
 *     extern MOZ_EXPORT int MeaningOfLife(void);
 *     extern MOZ_EXPORT int LuggageCombination;
 *
 *   api.c:
 *     int MeaningOfLife(void) { return 42; }
 *     int LuggageCombination = 12345;
 *
 * If you are merely sharing a method across files, just use plain |extern|.
 * These macros are designed for use by library interfaces -- not for normal
 * methods or data used cross-file.
 */
#if defined(WIN32)
#  define MOZ_EXPORT   __declspec(dllexport)
#else /* Unix */
#  ifdef HAVE_VISIBILITY_ATTRIBUTE
#    define MOZ_EXPORT       __attribute__((visibility("default")))
#  elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
#    define MOZ_EXPORT      __global
#  else
#    define MOZ_EXPORT /* nothing */
#  endif
#endif


/*
 * Whereas implementers use MOZ_EXPORT to declare and define library symbols,
 * users use MOZ_IMPORT_API and MOZ_IMPORT_DATA to access them.  Most often the
 * implementer of the library will expose an API macro which expands to either
 * the export or import version of the macro, depending upon the compilation
 * mode.
 */
#ifdef _WIN32
#  if defined(__MWERKS__)
#    define MOZ_IMPORT_API /* nothing */
#  else
#    define MOZ_IMPORT_API __declspec(dllimport)
#  endif
#else
#  define MOZ_IMPORT_API MOZ_EXPORT
#endif

#if defined(_WIN32) && !defined(__MWERKS__)
#  define MOZ_IMPORT_DATA  __declspec(dllimport)
#else
#  define MOZ_IMPORT_DATA  MOZ_EXPORT
#endif

/*
 * Consistent with the above comment, the MFBT_API and MFBT_DATA macros expose
 * export mfbt declarations when building mfbt, and they expose import mfbt
 * declarations when using mfbt.
 */
#if defined(IMPL_MFBT)
#  define MFBT_API     MOZ_EXPORT
#  define MFBT_DATA    MOZ_EXPORT
#else
  /*
   * On linux mozglue is linked in the program and we link libxul.so with
   * -z,defs. Normally that causes the linker to reject undefined references in
   * libxul.so, but as a loophole it allows undefined references to weak
   * symbols. We add the weak attribute to the import version of the MFBT API
   * macros to exploit this.
   */
#  if defined(MOZ_GLUE_IN_PROGRAM)
#    define MFBT_API   __attribute__((weak)) MOZ_IMPORT_API
#    define MFBT_DATA  __attribute__((weak)) MOZ_IMPORT_DATA
#  else
#    define MFBT_API   MOZ_IMPORT_API
#    define MFBT_DATA  MOZ_IMPORT_DATA
#  endif
#endif

/*
 * C symbols in C++ code must be declared immediately within |extern "C"|
 * blocks.  However, in C code, they need not be declared specially.  This
 * difference is abstracted behind the MOZ_BEGIN_EXTERN_C and MOZ_END_EXTERN_C
 * macros, so that the user need not know whether he is being used in C or C++
 * code.
 *
 *   MOZ_BEGIN_EXTERN_C
 *
 *   extern MOZ_EXPORT int MostRandomNumber(void);
 *   ...other declarations...
 *
 *   MOZ_END_EXTERN_C
 *
 * This said, it is preferable to just use |extern "C"| in C++ header files for
 * its greater clarity.
 */
#ifdef __cplusplus
#  define MOZ_BEGIN_EXTERN_C    extern "C" {
#  define MOZ_END_EXTERN_C      }
#else
#  define MOZ_BEGIN_EXTERN_C
#  define MOZ_END_EXTERN_C
#endif

/*
 * GCC's typeof is available when decltype is not.
 */
#if defined(__GNUC__) && defined(__cplusplus) && \
  !defined(__GXX_EXPERIMENTAL_CXX0X__) && __cplusplus < 201103L
#  define decltype __typeof__
#endif

#endif /* mozilla_Types_h */