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. */
32 #ifdef HANDLE_SYSV_PRAGMA
34 /* When structure field packing is in effect, this variable is the
35 number of bits to use as the maximum alignment. When packing is not
36 in effect, this is zero. */
38 extern int maximum_field_alignment;
40 /* File used for outputting assembler code. */
41 extern FILE *asm_out_file;
43 /* Handle one token of a pragma directive. TOKEN is the
44 current token, and STRING is its printable form. */
47 handle_pragma_token (string, token)
51 static enum pragma_state state = ps_start, type;
60 if (state == ps_right)
61 maximum_field_alignment = align * 8;
63 warning ("malformed `#pragma pack'");
65 else if (type == ps_weak)
67 #ifdef HANDLE_PRAGMA_WEAK
68 if (HANDLE_PRAGMA_WEAK)
69 handle_pragma_weak (state, name, value);
71 #endif /* HANDLE_PRAGMA_WEAK */
74 type = state = ps_start;
81 if (token && TREE_CODE (token) == IDENTIFIER_NODE)
83 if (strcmp (IDENTIFIER_POINTER (token), "pack") == 0)
84 type = state = ps_pack;
85 else if (strcmp (IDENTIFIER_POINTER (token), "weak") == 0)
86 type = state = ps_weak;
89 type = state = ps_done;
91 /* Issue a warning message if we have been asked to do so.
92 Ignoring unknown pragmas in system header file unless
93 an explcit -Wunknown-pragmas has been given. */
94 if (warn_unknown_pragmas > 1
95 || (warn_unknown_pragmas && ! in_system_header))
96 warning ("ignoring pragma: %s", string);
100 type = state = ps_done;
104 if (token && TREE_CODE (token) == IDENTIFIER_NODE)
106 name = IDENTIFIER_POINTER (token);
114 state = (strcmp (string, "=") ? ps_bad : ps_equals);
118 if (token && TREE_CODE (token) == IDENTIFIER_NODE)
120 value = IDENTIFIER_POINTER (token);
132 if (strcmp (string, "(") == 0)
139 if (token && TREE_CODE (token) == INTEGER_CST
140 && TREE_INT_CST_HIGH (token) == 0)
141 switch (TREE_INT_CST_LOW (token))
146 align = TREE_INT_CST_LOW (token);
153 else if (! token && strcmp (string, ")") == 0)
163 if (strcmp (string, ")") == 0)
181 #endif /* HANDLE_SYSV_PRAGMA */