1 /* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack.
2 Copyright (C) 1992 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
24 #ifdef HANDLE_SYSV_PRAGMA
26 /* Support #pragma weak by default if WEAK_ASM_OP is defined. */
27 #if !defined (HANDLE_PRAGMA_WEAK) && defined (WEAK_ASM_OP) && defined (SET_ASM_OP)
28 #define HANDLE_PRAGMA_WEAK 1
31 /* When structure field packing is in effect, this variable is the
32 number of bits to use as the maximum alignment. When packing is not
33 in effect, this is zero. */
35 extern int maximum_field_alignment;
37 /* File used for outputting assembler code. */
38 extern FILE *asm_out_file;
40 /* Handle one token of a pragma directive. TOKEN is the
41 current token, and STRING is its printable form. */
44 handle_pragma_token (string, token)
48 static enum pragma_state
61 } state = ps_start, type;
70 if (state == ps_right)
71 maximum_field_alignment = align * 8;
73 warning ("malformed `#pragma pack'");
75 else if (type == ps_weak)
77 #ifdef HANDLE_PRAGMA_WEAK
78 if (HANDLE_PRAGMA_WEAK)
80 if (state == ps_name || state == ps_value)
82 fprintf (asm_out_file, "\t%s\t", WEAK_ASM_OP);
83 ASM_OUTPUT_LABELREF (asm_out_file, name);
84 fputc ('\n', asm_out_file);
85 if (state == ps_value)
87 fprintf (asm_out_file, "\t%s\t", SET_ASM_OP);
88 ASM_OUTPUT_LABELREF (asm_out_file, name);
89 fputc (',', asm_out_file);
90 ASM_OUTPUT_LABELREF (asm_out_file, value);
91 fputc ('\n', asm_out_file);
94 else if (! (state == ps_done || state == ps_start))
95 warning ("malformed `#pragma weak'");
97 #endif /* HANDLE_PRAMA_WEAK */
100 type = state = ps_start;
107 if (token && TREE_CODE (token) == IDENTIFIER_NODE)
109 if (strcmp (IDENTIFIER_POINTER (token), "pack") == 0)
110 type = state = ps_pack;
111 else if (strcmp (IDENTIFIER_POINTER (token), "weak") == 0)
112 type = state = ps_weak;
114 type = state = ps_done;
117 type = state = ps_done;
121 if (token && TREE_CODE (token) == IDENTIFIER_NODE)
123 name = IDENTIFIER_POINTER (token);
131 state = (strcmp (string, "=") ? ps_bad : ps_equals);
135 if (token && TREE_CODE (token) == IDENTIFIER_NODE)
137 value = IDENTIFIER_POINTER (token);
149 if (strcmp (string, "(") == 0)
156 if (token && TREE_CODE (token) == INTEGER_CST
157 && TREE_INT_CST_HIGH (token) == 0)
158 switch (TREE_INT_CST_LOW (token))
163 align = TREE_INT_CST_LOW (token);
170 else if (! token && strcmp (string, ")") == 0)
180 if (strcmp (string, ")") == 0)
198 #endif /* HANDLE_SYSV_PRAGMA */