gcc/c-family/c-target.def

   1 /* Target hook definitions for C-family front ends.
   2    Copyright (C) 2001-2018 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify it
   5    under the terms of the GNU General Public License as published by the
   6    Free Software Foundation; either version 3, or (at your option) any
   7    later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; see the file COPYING3.  If not see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /* See target-hooks-macros.h for details of macros that should be
  19    provided by the including file, and how to use them here.  */
  20 #include "target-hooks-macros.h"
  21
  22 #undef HOOK_TYPE
  23 #define HOOK_TYPE "C Target Hook"
  24
  25 HOOK_VECTOR (TARGETCM_INITIALIZER, gcc_targetcm)
  26
  27 #undef HOOK_PREFIX
  28 #define HOOK_PREFIX "TARGET_"
  29
  30 /* Handle target switch CODE (an OPT_* value).  ARG is the argument
  31    passed to the switch; it is NULL if no argument was.  VALUE is the
  32    value of ARG if CODE specifies a UInteger option, otherwise it is
  33    1 if the positive form of the switch was used and 0 if the negative
  34    form was.  Return true if the switch was valid.  */
  35 DEFHOOK
  36 (handle_c_option,
  37  "",
  38  bool, (size_t code, const char *arg, int value),
  39  default_handle_c_option)
  40
  41 /* Targets may provide a string object type that can be used within
  42    and between C, C++, and Objective-C dialects.  */
  43
  44 DEFHOOK
  45 (objc_construct_string_object,
  46  "Targets may provide a string object type that can be used within\
  47  and between C, C++ and their respective Objective-C dialects.\
  48  A string object might, for example, embed encoding and length information.\
  49  These objects are considered opaque to the compiler and handled as references.\
  50  An ideal implementation makes the composition of the string object\
  51  match that of the Objective-C @code{NSString} (@code{NXString} for GNUStep),\
  52  allowing efficient interworking between C-only and Objective-C code.\
  53  If a target implements string objects then this hook should return a\
  54  reference to such an object constructed from the normal `C' string\
  55  representation provided in @var{string}.\
  56  At present, the hook is used by Objective-C only, to obtain a\
  57  common-format string object when the target provides one.",
  58  tree, (tree string),
  59  NULL)
  60
  61 DEFHOOK
  62 (objc_declare_unresolved_class_reference,
  63  "Declare that Objective C class @var{classname} is referenced\
  64   by the current TU.",
  65  void, (const char *classname),
  66  NULL)
  67
  68 DEFHOOK
  69 (objc_declare_class_definition,
  70  "Declare that Objective C class @var{classname} is defined\
  71   by the current TU.",
  72  void, (const char *classname),
  73  NULL)
  74
  75 DEFHOOK
  76 (string_object_ref_type_p,
  77  "If a target implements string objects then this hook should return\
  78  @code{true} if @var{stringref} is a valid reference to such an object.",
  79  bool, (const_tree stringref),
  80  hook_bool_const_tree_false)
  81
  82 DEFHOOK
  83 (check_string_object_format_arg,
  84  "If a target implements string objects then this hook should should\
  85   provide a facility to check the function arguments in @var{args_list}\
  86   against the format specifiers in @var{format_arg} where the type of\
  87   @var{format_arg} is one recognized as a valid string reference type.",
  88  void, (tree format_arg, tree args_list),
  89  NULL)
  90
  91 DEFHOOK
  92 (c_preinclude,
  93  "Define this hook to return the name of a header file to be included at\
  94  the start of all compilations, as if it had been included with\
  95  @code{#include <@var{file}>}.  If this hook returns @code{NULL}, or is\
  96  not defined, or the header is not found, or if the user specifies\
  97  @option{-ffreestanding} or @option{-nostdinc}, no header is included.\n\
  98 \n\
  99  This hook can be used together with a header provided by the system C\
 100  library to implement ISO C requirements for certain macros to be\
 101  predefined that describe properties of the whole implementation rather\
 102  than just the compiler.",
 103  const char *, (void),
 104  hook_constcharptr_void_null)
 105
 106 DEFHOOK
 107 (cxx_implicit_extern_c,
 108  "Define this hook to add target-specific C++ implicit extern C functions.\
 109  If this function returns true for the name of a file-scope function, that\
 110  function implicitly gets extern \"C\" linkage rather than whatever language\
 111  linkage the declaration would normally have.  An example of such function\
 112  is WinMain on Win32 targets.",
 113  bool, (const char*),
 114  NULL)
 115
 116 HOOK_VECTOR_END (C90_EMPTY_HACK)