[8833] | 1 | /* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack. |
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| 2 | Copyright (C) 1992 Free Software Foundation, Inc. |
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| 3 | |
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| 4 | This file is part of GNU CC. |
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| 5 | |
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| 6 | GNU CC is free software; you can redistribute it and/or modify |
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| 7 | it under the terms of the GNU General Public License as published by |
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| 8 | the Free Software Foundation; either version 2, or (at your option) |
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| 9 | any later version. |
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| 10 | |
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| 11 | GNU CC is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | GNU General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU General Public License |
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| 17 | along with GNU CC; see the file COPYING. If not, write to |
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| 18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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| 19 | Boston, MA 02111-1307, USA. */ |
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| 20 | |
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| 21 | #include <stdio.h> |
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| 22 | #include "config.h" |
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| 23 | #include "tree.h" |
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| 24 | #include "function.h" |
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| 25 | #include "defaults.h" |
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| 26 | #include "c-pragma.h" |
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| 27 | |
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| 28 | #ifdef HANDLE_SYSV_PRAGMA |
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| 29 | |
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| 30 | /* When structure field packing is in effect, this variable is the |
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| 31 | number of bits to use as the maximum alignment. When packing is not |
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| 32 | in effect, this is zero. */ |
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| 33 | |
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| 34 | extern int maximum_field_alignment; |
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| 35 | |
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| 36 | /* File used for outputting assembler code. */ |
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| 37 | extern FILE *asm_out_file; |
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| 38 | |
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| 39 | /* Handle one token of a pragma directive. TOKEN is the |
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| 40 | current token, and STRING is its printable form. */ |
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| 41 | |
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| 42 | void |
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| 43 | handle_pragma_token (string, token) |
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| 44 | char *string; |
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| 45 | tree token; |
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| 46 | { |
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| 47 | static enum pragma_state state = ps_start, type; |
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| 48 | static char *name; |
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| 49 | static char *value; |
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| 50 | static int align; |
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| 51 | |
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| 52 | if (string == 0) |
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| 53 | { |
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| 54 | if (type == ps_pack) |
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| 55 | { |
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| 56 | if (state == ps_right) |
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| 57 | maximum_field_alignment = align * 8; |
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| 58 | else |
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| 59 | warning ("malformed `#pragma pack'"); |
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| 60 | } |
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| 61 | else if (type == ps_weak) |
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| 62 | { |
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| 63 | #ifdef HANDLE_PRAGMA_WEAK |
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| 64 | if (HANDLE_PRAGMA_WEAK) |
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| 65 | handle_pragma_weak (state, name, value); |
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| 66 | |
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| 67 | #endif /* HANDLE_PRAMA_WEAK */ |
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| 68 | } |
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| 69 | |
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| 70 | type = state = ps_start; |
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| 71 | return; |
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| 72 | } |
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| 73 | |
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| 74 | switch (state) |
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| 75 | { |
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| 76 | case ps_start: |
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| 77 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) |
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| 78 | { |
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| 79 | if (strcmp (IDENTIFIER_POINTER (token), "pack") == 0) |
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| 80 | type = state = ps_pack; |
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| 81 | else if (strcmp (IDENTIFIER_POINTER (token), "weak") == 0) |
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| 82 | type = state = ps_weak; |
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| 83 | else |
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| 84 | type = state = ps_done; |
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| 85 | } |
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| 86 | else |
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| 87 | type = state = ps_done; |
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| 88 | break; |
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| 89 | |
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| 90 | case ps_weak: |
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| 91 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) |
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| 92 | { |
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| 93 | name = IDENTIFIER_POINTER (token); |
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| 94 | state = ps_name; |
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| 95 | } |
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| 96 | else |
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| 97 | state = ps_bad; |
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| 98 | break; |
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| 99 | |
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| 100 | case ps_name: |
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| 101 | state = (strcmp (string, "=") ? ps_bad : ps_equals); |
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| 102 | break; |
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| 103 | |
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| 104 | case ps_equals: |
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| 105 | if (token && TREE_CODE (token) == IDENTIFIER_NODE) |
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| 106 | { |
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| 107 | value = IDENTIFIER_POINTER (token); |
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| 108 | state = ps_value; |
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| 109 | } |
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| 110 | else |
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| 111 | state = ps_bad; |
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| 112 | break; |
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| 113 | |
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| 114 | case ps_value: |
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| 115 | state = ps_bad; |
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| 116 | break; |
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| 117 | |
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| 118 | case ps_pack: |
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| 119 | if (strcmp (string, "(") == 0) |
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| 120 | state = ps_left; |
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| 121 | else |
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| 122 | state = ps_bad; |
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| 123 | break; |
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| 124 | |
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| 125 | case ps_left: |
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| 126 | if (token && TREE_CODE (token) == INTEGER_CST |
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| 127 | && TREE_INT_CST_HIGH (token) == 0) |
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| 128 | switch (TREE_INT_CST_LOW (token)) |
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| 129 | { |
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| 130 | case 1: |
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| 131 | case 2: |
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| 132 | case 4: |
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| 133 | align = TREE_INT_CST_LOW (token); |
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| 134 | state = ps_align; |
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| 135 | break; |
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| 136 | |
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| 137 | default: |
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| 138 | state = ps_bad; |
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| 139 | } |
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| 140 | else if (! token && strcmp (string, ")") == 0) |
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| 141 | { |
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| 142 | align = 0; |
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| 143 | state = ps_right; |
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| 144 | } |
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| 145 | else |
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| 146 | state = ps_bad; |
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| 147 | break; |
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| 148 | |
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| 149 | case ps_align: |
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| 150 | if (strcmp (string, ")") == 0) |
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| 151 | state = ps_right; |
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| 152 | else |
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| 153 | state = ps_bad; |
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| 154 | break; |
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| 155 | |
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| 156 | case ps_right: |
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| 157 | state = ps_bad; |
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| 158 | break; |
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| 159 | |
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| 160 | case ps_bad: |
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| 161 | case ps_done: |
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| 162 | break; |
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| 163 | |
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| 164 | default: |
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| 165 | abort (); |
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| 166 | } |
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| 167 | } |
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| 168 | #endif /* HANDLE_SYSV_PRAGMA */ |
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