1 /* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack.
2 Copyright (C) 1992, 1997 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
30 #ifdef HANDLE_SYSV_PRAGMA
32 /* When structure field packing is in effect, this variable is the
33 number of bits to use as the maximum alignment. When packing is not
34 in effect, this is zero. */
36 extern int maximum_field_alignment;
38 /* File used for outputting assembler code. */
39 extern FILE *asm_out_file;
41 /* Handle one token of a pragma directive. TOKEN is the
42 current token, and STRING is its printable form. */
45 handle_pragma_token (string, token)
49 static enum pragma_state state = ps_start, type;
58 if (state == ps_right)
59 maximum_field_alignment = align * 8;
61 warning ("malformed `#pragma pack'");
63 else if (type == ps_weak)
65 #ifdef HANDLE_PRAGMA_WEAK
66 if (HANDLE_PRAGMA_WEAK)
67 handle_pragma_weak (state, name, value);
69 #endif /* HANDLE_PRAGMA_WEAK */
72 type = state = ps_start;
79 if (token && TREE_CODE (token) == IDENTIFIER_NODE)
81 if (strcmp (IDENTIFIER_POINTER (token), "pack") == 0)
82 type = state = ps_pack;
83 else if (strcmp (IDENTIFIER_POINTER (token), "weak") == 0)
84 type = state = ps_weak;
87 type = state = ps_done;
89 /* Issue a warning message if we have been asked to do so.
90 Ignoring unknown pragmas in system header file unless
91 an explcit -Wunknown-pragmas has been given. */
92 if (warn_unknown_pragmas > 1
93 || (warn_unknown_pragmas && ! in_system_header))
94 warning ("ignoring pragma: %s", string);
98 type = state = ps_done;
102 if (token && TREE_CODE (token) == IDENTIFIER_NODE)
104 name = IDENTIFIER_POINTER (token);
112 state = (strcmp (string, "=") ? ps_bad : ps_equals);
116 if (token && TREE_CODE (token) == IDENTIFIER_NODE)
118 value = IDENTIFIER_POINTER (token);
130 if (strcmp (string, "(") == 0)
137 if (token && TREE_CODE (token) == INTEGER_CST
138 && TREE_INT_CST_HIGH (token) == 0)
139 switch (TREE_INT_CST_LOW (token))
144 align = TREE_INT_CST_LOW (token);
151 else if (! token && strcmp (string, ")") == 0)
161 if (strcmp (string, ")") == 0)
179 #endif /* HANDLE_SYSV_PRAGMA */