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 /* Construct tress for identifiers.  */
  81 DEF_ATTR_IDENT (ATTR_CONST, "const")
  82 DEF_ATTR_IDENT (ATTR_FORMAT, "format")
  83 DEF_ATTR_IDENT (ATTR_FORMAT_ARG, "format_arg")
  84 DEF_ATTR_IDENT (ATTR_MALLOC, "malloc")
  85 DEF_ATTR_IDENT (ATTR_NONNULL, "nonnull")
  86 DEF_ATTR_IDENT (ATTR_NORETURN, "noreturn")
  87 DEF_ATTR_IDENT (ATTR_NOTHROW, "nothrow")
  88 DEF_ATTR_IDENT (ATTR_PRINTF, "printf")
  89 DEF_ATTR_IDENT (ATTR_PURE, "pure")
  90 DEF_ATTR_IDENT (ATTR_SCANF, "scanf")
  91 DEF_ATTR_IDENT (ATTR_STRFMON, "strfmon")
  92 DEF_ATTR_IDENT (ATTR_STRFTIME, "strftime")
  93
  94 DEF_ATTR_TREE_LIST (ATTR_NOTHROW_LIST, ATTR_NOTHROW, ATTR_NULL, ATTR_NULL)
  95
  96 DEF_ATTR_TREE_LIST (ATTR_CONST_NOTHROW_LIST, ATTR_CONST,        \
  97                         ATTR_NULL, ATTR_NOTHROW_LIST)
  98 DEF_ATTR_TREE_LIST (ATTR_PURE_NOTHROW_LIST, ATTR_PURE,          \
  99                         ATTR_NULL, ATTR_NOTHROW_LIST)
 100 DEF_ATTR_TREE_LIST (ATTR_NORETURN_NOTHROW_LIST, ATTR_NORETURN,  \
 101                         ATTR_NULL, ATTR_NOTHROW_LIST)
 102 DEF_ATTR_TREE_LIST (ATTR_MALLOC_NOTHROW_LIST, ATTR_MALLOC,      \
 103                         ATTR_NULL, ATTR_NOTHROW_LIST)
 104
 105 DEF_ATTR_TREE_LIST (ATTR_NONNULL_1, ATTR_NONNULL, ATTR_LIST_1, ATTR_NULL)
 106 DEF_ATTR_TREE_LIST (ATTR_NONNULL_2, ATTR_NONNULL, ATTR_LIST_2, ATTR_NULL)
 107 DEF_ATTR_TREE_LIST (ATTR_NONNULL_3, ATTR_NONNULL, ATTR_LIST_3, ATTR_NULL)
 108
 109 /* Construct a tree for a format attribute.  */
 110 #define DEF_FORMAT_ATTRIBUTE(TYPE, FA, VALUES)                           \
 111   DEF_ATTR_TREE_LIST (CONCAT4 (ATTR_,TYPE,_,VALUES), ATTR_NULL,          \
 112                       CONCAT2 (ATTR_,TYPE), CONCAT2 (ATTR_LIST_,VALUES)) \
 113   DEF_ATTR_TREE_LIST (CONCAT4 (ATTR_FORMAT_,TYPE,_,VALUES), ATTR_FORMAT, \
 114                       CONCAT4 (ATTR_,TYPE,_,VALUES), CONCAT2 (ATTR_NONNULL_,FA))
 115 DEF_FORMAT_ATTRIBUTE(PRINTF,1,1_0)
 116 DEF_FORMAT_ATTRIBUTE(PRINTF,1,1_2)
 117 DEF_FORMAT_ATTRIBUTE(PRINTF,2,2_0)
 118 DEF_FORMAT_ATTRIBUTE(PRINTF,2,2_3)
 119 DEF_FORMAT_ATTRIBUTE(PRINTF,3,3_0)
 120 DEF_FORMAT_ATTRIBUTE(PRINTF,3,3_4)
 121 DEF_FORMAT_ATTRIBUTE(SCANF,1,1_0)
 122 DEF_FORMAT_ATTRIBUTE(SCANF,1,1_2)
 123 DEF_FORMAT_ATTRIBUTE(SCANF,2,2_0)
 124 DEF_FORMAT_ATTRIBUTE(SCANF,2,2_3)
 125 DEF_FORMAT_ATTRIBUTE(STRFTIME,3,3_0)
 126 DEF_FORMAT_ATTRIBUTE(STRFMON,3,3_4)
 127 #undef DEF_FORMAT_ATTRIBUTE
 128
 129 /* Construct a tree for a format_arg attribute.  */
 130 #define DEF_FORMAT_ARG_ATTRIBUTE(FA)                                    \
 131   DEF_ATTR_TREE_LIST (CONCAT2 (ATTR_FORMAT_ARG_,FA), ATTR_FORMAT_ARG,   \
 132                       CONCAT2 (ATTR_LIST_,FA), CONCAT2 (ATTR_NONNULL_,FA))
 133 DEF_FORMAT_ARG_ATTRIBUTE(1)
 134 DEF_FORMAT_ARG_ATTRIBUTE(2)
 135 #undef DEF_FORMAT_ARG_ATTRIBUTE
 136
 137 /* Define an attribute for a function, along with the IDENTIFIER_NODE.  */
 138 #define DEF_FN_ATTR_IDENT(NAME, ATTRS, PREDICATE)       \
 139   DEF_ATTR_IDENT (CONCAT2(ATTR_,NAME), STRINGX(NAME))   \
 140   DEF_FN_ATTR (CONCAT2(ATTR_,NAME), ATTRS, PREDICATE)
 141
 142 /* The ISO C functions are always checked (whether <stdio.h> is
 143    included or not), since it is common to call printf without
 144    including <stdio.h>.  There shouldn't be a problem with this,
 145    since ISO C reserves these function names whether you include the
 146    header file or not.  In any case, the checking is harmless.  With
 147    -ffreestanding, these default attributes are disabled, and must be
 148    specified manually if desired.  */
 149
 150 /* Functions from ISO/IEC 9899:1990.  */
 151 #define DEF_C89_ATTR(NAME, ATTRS) DEF_FN_ATTR_IDENT (NAME, ATTRS, flag_hosted)
 152 DEF_C89_ATTR (sprintf, ATTR_FORMAT_PRINTF_2_3)
 153 DEF_C89_ATTR (scanf, ATTR_FORMAT_SCANF_1_2)
 154 DEF_C89_ATTR (fscanf, ATTR_FORMAT_SCANF_2_3)
 155 DEF_C89_ATTR (sscanf, ATTR_FORMAT_SCANF_2_3)
 156 DEF_C89_ATTR (vprintf, ATTR_FORMAT_PRINTF_1_0)
 157 DEF_C89_ATTR (vfprintf, ATTR_FORMAT_PRINTF_2_0)
 158 DEF_C89_ATTR (vsprintf, ATTR_FORMAT_PRINTF_2_0)
 159 DEF_C89_ATTR (strftime, ATTR_FORMAT_STRFTIME_3_0)
 160 #undef DEF_C89_ATTR
 161
 162 /* ISO C99 adds the snprintf and vscanf family functions.  */
 163 #define DEF_C99_ATTR(NAME, ATTRS)                                           \
 164   DEF_FN_ATTR_IDENT (NAME, ATTRS,                                           \
 165                (flag_hosted                                                 \
 166                 && (flag_isoc99 || flag_noniso_default_format_attributes)))
 167 DEF_C99_ATTR (snprintf, ATTR_FORMAT_PRINTF_3_4)
 168 DEF_C99_ATTR (vsnprintf, ATTR_FORMAT_PRINTF_3_0)
 169 DEF_C99_ATTR (vscanf, ATTR_FORMAT_SCANF_1_0)
 170 DEF_C99_ATTR (vfscanf, ATTR_FORMAT_SCANF_2_0)
 171 DEF_C99_ATTR (vsscanf, ATTR_FORMAT_SCANF_2_0)
 172 #undef DEF_C99_ATTR
 173
 174 /* Functions not in any version of ISO C.  */
 175 #define DEF_EXT_ATTR(NAME, ATTRS)                                       \
 176   DEF_FN_ATTR_IDENT (NAME, ATTRS,                                       \
 177                flag_hosted && flag_noniso_default_format_attributes)
 178 /* Uniforum/GNU gettext functions.  */
 179 DEF_EXT_ATTR (gettext, ATTR_FORMAT_ARG_1)
 180 DEF_EXT_ATTR (dgettext, ATTR_FORMAT_ARG_2)
 181 DEF_EXT_ATTR (dcgettext, ATTR_FORMAT_ARG_2)
 182 /* X/Open strfmon function.  */
 183 DEF_EXT_ATTR (strfmon, ATTR_FORMAT_STRFMON_3_4)
 184 #undef DEF_EXT_ATTR
 185 #undef DEF_FN_ATTR_IDENT