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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