gcc/builtin-attrs.def

   1 /* Copyright (C) 2001, 2002 Free Software Foundation, Inc.
   2    Contributed by Joseph Myers <jsm28@cam.ac.uk>.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 2, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING.  If not, write to the Free
  18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  19 02111-1307, USA.  */
  20
  21 /* This header provides a declarative way of describing the attributes
  22    that are applied to some functions by default.
  23
  24    Before including this header, you must define the following macros.
  25    In each case where there is an ENUM, it is an identifier used to
  26    reference the tree in subsequent definitions.
  27
  28    DEF_ATTR_NULL_TREE (ENUM)
  29
  30      Constructs a NULL_TREE.
  31
  32    DEF_ATTR_INT (ENUM, VALUE)
  33
  34      Constructs an INTEGER_CST with value VALUE (an integer representable
  35      in HOST_WIDE_INT).
  36
  37    DEF_ATTR_IDENT (ENUM, STRING)
  38
  39      Constructs an IDENTIFIER_NODE for STRING.
  40
  41    DEF_ATTR_TREE_LIST (ENUM, PURPOSE, VALUE, CHAIN)
  42
  43      Constructs a TREE_LIST with given PURPOSE, VALUE and CHAIN (given
  44      as previous ENUM names).
  45
  46    DEF_FN_ATTR (NAME, ATTRS, PREDICATE)
  47
  48      Specifies that the function with name NAME (a previous ENUM for an
  49      IDENTIFIER_NODE) has attributes ATTRS (a previous ENUM) if
  50      PREDICATE is true.  */
  51
  52 DEF_ATTR_NULL_TREE (ATTR_NULL)
  53
  54 /* Note that below we must avoid whitespace in arguments of CONCAT*.  */
  55
  56 /* Construct a tree for a given integer and a list containing it.  */
  57 #define DEF_ATTR_FOR_INT(VALUE)                                 \
  58   DEF_ATTR_INT (CONCAT2 (ATTR_,VALUE), VALUE)                   \
  59   DEF_ATTR_TREE_LIST (CONCAT2 (ATTR_LIST_,VALUE), ATTR_NULL,    \
  60                       CONCAT2 (ATTR_,VALUE), ATTR_NULL)
  61 DEF_ATTR_FOR_INT (0)
  62 DEF_ATTR_FOR_INT (1)
  63 DEF_ATTR_FOR_INT (2)
  64 DEF_ATTR_FOR_INT (3)
  65 DEF_ATTR_FOR_INT (4)
  66 #undef DEF_ATTR_FOR_INT
  67
  68 /* Construct a tree for a list of two integers.  */
  69 #define DEF_LIST_INT_INT(VALUE1, VALUE2)                                 \
  70   DEF_ATTR_TREE_LIST (CONCAT4 (ATTR_LIST_,VALUE1,_,VALUE2), ATTR_NULL,   \
  71                     CONCAT2 (ATTR_,VALUE1), CONCAT2 (ATTR_LIST_,VALUE2))
  72 DEF_LIST_INT_INT (1,0)
  73 DEF_LIST_INT_INT (1,2)
  74 DEF_LIST_INT_INT (2,0)
  75 DEF_LIST_INT_INT (2,3)
  76 DEF_LIST_INT_INT (3,0)
  77 DEF_LIST_INT_INT (3,4)
  78 #undef DEF_LIST_INT_INT
  79
  80 DEF_ATTR_IDENT (ATTR_PRINTF, "printf")
  81 DEF_ATTR_IDENT (ATTR_SCANF, "scanf")
  82 DEF_ATTR_IDENT (ATTR_STRFTIME, "strftime")
  83 DEF_ATTR_IDENT (ATTR_STRFMON, "strfmon")
  84
  85 DEF_ATTR_IDENT (ATTR_FORMAT, "format")
  86 DEF_ATTR_IDENT (ATTR_FORMAT_ARG, "format_arg")
  87
  88 DEF_ATTR_IDENT (ATTR_NONNULL, "nonnull")
  89
  90 DEF_ATTR_TREE_LIST (ATTR_NONNULL_1, ATTR_NONNULL, ATTR_LIST_1, ATTR_NULL)
  91 DEF_ATTR_TREE_LIST (ATTR_NONNULL_2, ATTR_NONNULL, ATTR_LIST_2, ATTR_NULL)
  92 DEF_ATTR_TREE_LIST (ATTR_NONNULL_3, ATTR_NONNULL, ATTR_LIST_3, ATTR_NULL)
  93
  94 /* Construct a tree for a format attribute.  */
  95 #define DEF_FORMAT_ATTRIBUTE(TYPE, FA, VALUES)                           \
  96   DEF_ATTR_TREE_LIST (CONCAT4 (ATTR_,TYPE,_,VALUES), ATTR_NULL,          \
  97                       CONCAT2 (ATTR_,TYPE), CONCAT2 (ATTR_LIST_,VALUES)) \
  98   DEF_ATTR_TREE_LIST (CONCAT4 (ATTR_FORMAT_,TYPE,_,VALUES), ATTR_FORMAT, \
  99                       CONCAT4 (ATTR_,TYPE,_,VALUES), CONCAT2 (ATTR_NONNULL_,FA))
 100 DEF_FORMAT_ATTRIBUTE(PRINTF,1,1_0)
 101 DEF_FORMAT_ATTRIBUTE(PRINTF,1,1_2)
 102 DEF_FORMAT_ATTRIBUTE(PRINTF,2,2_0)
 103 DEF_FORMAT_ATTRIBUTE(PRINTF,2,2_3)
 104 DEF_FORMAT_ATTRIBUTE(PRINTF,3,3_0)
 105 DEF_FORMAT_ATTRIBUTE(PRINTF,3,3_4)
 106 DEF_FORMAT_ATTRIBUTE(SCANF,1,1_0)
 107 DEF_FORMAT_ATTRIBUTE(SCANF,1,1_2)
 108 DEF_FORMAT_ATTRIBUTE(SCANF,2,2_0)
 109 DEF_FORMAT_ATTRIBUTE(SCANF,2,2_3)
 110 DEF_FORMAT_ATTRIBUTE(STRFTIME,3,3_0)
 111 DEF_FORMAT_ATTRIBUTE(STRFMON,3,3_4)
 112 #undef DEF_FORMAT_ATTRIBUTE
 113
 114 /* Construct a tree for a format_arg attribute.  */
 115 #define DEF_FORMAT_ARG_ATTRIBUTE(FA)                                    \
 116   DEF_ATTR_TREE_LIST (CONCAT2 (ATTR_FORMAT_ARG_,FA), ATTR_FORMAT_ARG,   \
 117                       CONCAT2 (ATTR_LIST_,FA), CONCAT2 (ATTR_NONNULL_,FA))
 118 DEF_FORMAT_ARG_ATTRIBUTE(1)
 119 DEF_FORMAT_ARG_ATTRIBUTE(2)
 120 #undef DEF_FORMAT_ARG_ATTRIBUTE
 121
 122 /* Define an attribute for a function, along with the IDENTIFIER_NODE.  */
 123 #define DEF_FN_ATTR_IDENT(NAME, ATTRS, PREDICATE)       \
 124   DEF_ATTR_IDENT (CONCAT2(ATTR_,NAME), STRINGX(NAME))   \
 125   DEF_FN_ATTR (CONCAT2(ATTR_,NAME), ATTRS, PREDICATE)
 126
 127 /* The ISO C functions are always checked (whether <stdio.h> is
 128    included or not), since it is common to call printf without
 129    including <stdio.h>.  There shouldn't be a problem with this,
 130    since ISO C reserves these function names whether you include the
 131    header file or not.  In any case, the checking is harmless.  With
 132    -ffreestanding, these default attributes are disabled, and must be
 133    specified manually if desired.  */
 134
 135 /* __builtin functions should be checked unconditionally, even with
 136    -ffreestanding.  */
 137 DEF_FN_ATTR_IDENT (__builtin_printf, ATTR_FORMAT_PRINTF_1_2, true)
 138 DEF_FN_ATTR_IDENT (__builtin_fprintf, ATTR_FORMAT_PRINTF_2_3, true)
 139 DEF_FN_ATTR_IDENT (__builtin_printf_unlocked, ATTR_FORMAT_PRINTF_1_2, true)
 140 DEF_FN_ATTR_IDENT (__builtin_fprintf_unlocked, ATTR_FORMAT_PRINTF_2_3, true)
 141
 142 /* Functions from ISO/IEC 9899:1990.  */
 143 #define DEF_C89_ATTR(NAME, ATTRS) DEF_FN_ATTR_IDENT (NAME, ATTRS, flag_hosted)
 144 DEF_C89_ATTR (printf, ATTR_FORMAT_PRINTF_1_2)
 145 DEF_C89_ATTR (fprintf, ATTR_FORMAT_PRINTF_2_3)
 146 DEF_C89_ATTR (sprintf, ATTR_FORMAT_PRINTF_2_3)
 147 DEF_C89_ATTR (scanf, ATTR_FORMAT_SCANF_1_2)
 148 DEF_C89_ATTR (fscanf, ATTR_FORMAT_SCANF_2_3)
 149 DEF_C89_ATTR (sscanf, ATTR_FORMAT_SCANF_2_3)
 150 DEF_C89_ATTR (vprintf, ATTR_FORMAT_PRINTF_1_0)
 151 DEF_C89_ATTR (vfprintf, ATTR_FORMAT_PRINTF_2_0)
 152 DEF_C89_ATTR (vsprintf, ATTR_FORMAT_PRINTF_2_0)
 153 DEF_C89_ATTR (strftime, ATTR_FORMAT_STRFTIME_3_0)
 154 #undef DEF_C89_ATTR
 155
 156 /* ISO C99 adds the snprintf and vscanf family functions.  */
 157 #define DEF_C99_ATTR(NAME, ATTRS)                                           \
 158   DEF_FN_ATTR_IDENT (NAME, ATTRS,                                           \
 159                (flag_hosted                                                 \
 160                 && (flag_isoc99 || flag_noniso_default_format_attributes)))
 161 DEF_C99_ATTR (snprintf, ATTR_FORMAT_PRINTF_3_4)
 162 DEF_C99_ATTR (vsnprintf, ATTR_FORMAT_PRINTF_3_0)
 163 DEF_C99_ATTR (vscanf, ATTR_FORMAT_SCANF_1_0)
 164 DEF_C99_ATTR (vfscanf, ATTR_FORMAT_SCANF_2_0)
 165 DEF_C99_ATTR (vsscanf, ATTR_FORMAT_SCANF_2_0)
 166 #undef DEF_C99_ATTR
 167
 168 /* Functions not in any version of ISO C.  */
 169 #define DEF_EXT_ATTR(NAME, ATTRS)                                       \
 170   DEF_FN_ATTR_IDENT (NAME, ATTRS,                                       \
 171                flag_hosted && flag_noniso_default_format_attributes)
 172 /* Uniforum/GNU gettext functions.  */
 173 DEF_EXT_ATTR (gettext, ATTR_FORMAT_ARG_1)
 174 DEF_EXT_ATTR (dgettext, ATTR_FORMAT_ARG_2)
 175 DEF_EXT_ATTR (dcgettext, ATTR_FORMAT_ARG_2)
 176 /* X/Open strfmon function.  */
 177 DEF_EXT_ATTR (strfmon, ATTR_FORMAT_STRFMON_3_4)
 178 /* Glibc thread-unsafe stdio functions.  */
 179 DEF_EXT_ATTR (printf_unlocked, ATTR_FORMAT_PRINTF_1_2)
 180 DEF_EXT_ATTR (fprintf_unlocked, ATTR_FORMAT_PRINTF_2_3)
 181 #undef DEF_EXT_ATTR
 182 #undef DEF_FN_ATTR_IDENT