1 | /* scan-decls.c - Extracts declarations from cpp output. |
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2 | Copyright (C) 1993, 1995 Free Software Foundation, Inc. |
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3 | |
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4 | This program is free software; you can redistribute it and/or modify it |
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5 | under the terms of the GNU General Public License as published by the |
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6 | Free Software Foundation; either version 2, or (at your option) any |
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7 | later version. |
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8 | |
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9 | This program is distributed in the hope that it will be useful, |
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10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 | GNU General Public License for more details. |
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13 | |
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14 | You should have received a copy of the GNU General Public License |
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15 | along with this program; if not, write to the Free Software |
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16 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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17 | |
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18 | Written by Per Bothner <bothner@cygnus.com>, July 1993. */ |
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19 | |
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20 | #include <stdio.h> |
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21 | #include <ctype.h> |
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22 | #include "hconfig.h" |
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23 | #include "cpplib.h" |
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24 | |
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25 | int brace_nesting = 0; |
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26 | |
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27 | /* The first extern_C_braces_length elements of extern_C_braces |
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28 | indicate the (brace nesting levels of) left braces that were |
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29 | prefixed by extern "C". */ |
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30 | int extern_C_braces_length = 0; |
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31 | char extern_C_braces[20]; |
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32 | #define in_extern_C_brace (extern_C_braces_length>0) |
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33 | |
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34 | /* True if the function declaration currently being scanned is |
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35 | prefixed by extern "C". */ |
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36 | int current_extern_C = 0; |
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37 | |
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38 | static void |
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39 | skip_to_closing_brace (pfile) |
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40 | cpp_reader *pfile; |
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41 | { |
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42 | int nesting = 1; |
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43 | for (;;) |
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44 | { |
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45 | enum cpp_token token = cpp_get_token (pfile); |
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46 | if (token == CPP_EOF) |
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47 | break; |
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48 | if (token == CPP_LBRACE) |
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49 | nesting++; |
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50 | if (token == CPP_RBRACE && --nesting == 0) |
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51 | break; |
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52 | } |
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53 | } |
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54 | |
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55 | /* This function scans a C source file (actually, the output of cpp), |
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56 | reading from FP. It looks for function declarations, and |
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57 | external variable declarations. |
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58 | |
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59 | The following grammar (as well as some extra stuff) is recognized: |
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60 | |
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61 | declaration: |
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62 | (decl-specifier)* declarator ("," declarator)* ";" |
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63 | decl-specifier: |
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64 | identifier |
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65 | keyword |
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66 | extern "C" |
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67 | declarator: |
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68 | (ptr-operator)* dname [ "(" argument-declaration-list ")" ] |
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69 | ptr-operator: |
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70 | ("*" | "&") ("const" | "volatile")* |
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71 | dname: |
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72 | identifier |
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73 | |
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74 | Here dname is the actual name being declared. |
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75 | */ |
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76 | |
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77 | int |
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78 | scan_decls (pfile, argc, argv) |
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79 | cpp_reader *pfile; |
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80 | int argc; |
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81 | char**argv; |
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82 | { |
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83 | int saw_extern, saw_inline; |
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84 | int old_written; |
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85 | /* If declarator_start is non-zero, it marks the start of the current |
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86 | declarator. If it is zero, we are either still parsing the |
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87 | decl-specs, or prev_id_start marks the start of the declarator. */ |
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88 | int declarator_start; |
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89 | int prev_id_start, prev_id_end; |
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90 | enum cpp_token token; |
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91 | |
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92 | new_statement: |
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93 | CPP_SET_WRITTEN (pfile, 0); |
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94 | token = cpp_get_token (pfile); |
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95 | |
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96 | handle_statement: |
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97 | current_extern_C = 0; |
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98 | saw_extern = 0; |
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99 | saw_inline = 0; |
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100 | if (token == CPP_RBRACE) |
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101 | { |
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102 | /* Pop an 'extern "C"' nesting level, if appropriate. */ |
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103 | if (extern_C_braces_length |
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104 | && extern_C_braces[extern_C_braces_length - 1] == brace_nesting) |
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105 | extern_C_braces_length--; |
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106 | brace_nesting--; |
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107 | goto new_statement; |
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108 | } |
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109 | if (token == CPP_LBRACE) |
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110 | { |
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111 | brace_nesting++; |
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112 | goto new_statement; |
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113 | } |
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114 | if (token == CPP_EOF) |
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115 | return 0; |
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116 | if (token == CPP_SEMICOLON) |
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117 | goto new_statement; |
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118 | if (token != CPP_NAME) |
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119 | goto new_statement; |
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120 | |
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121 | prev_id_start = 0; |
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122 | declarator_start = 0; |
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123 | for (;;) |
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124 | { |
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125 | int start_written = CPP_WRITTEN (pfile); |
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126 | token = cpp_get_token (pfile); |
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127 | handle_token: |
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128 | switch (token) |
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129 | { |
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130 | case CPP_LPAREN: |
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131 | /* Looks like this is the start of a formal parameter list. */ |
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132 | if (prev_id_start) |
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133 | { |
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134 | int nesting = 1; |
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135 | int have_arg_list = 0; |
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136 | cpp_buffer *fbuf = cpp_file_buffer (pfile); |
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137 | long func_lineno; |
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138 | cpp_buf_line_and_col (fbuf, &func_lineno, NULL); |
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139 | for (;;) |
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140 | { |
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141 | token = cpp_get_token (pfile); |
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142 | if (token == CPP_LPAREN) |
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143 | nesting++; |
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144 | else if (token == CPP_RPAREN) |
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145 | { |
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146 | nesting--; |
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147 | if (nesting == 0) |
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148 | break; |
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149 | } |
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150 | else if (token == CPP_EOF) |
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151 | break; |
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152 | else if (token == CPP_NAME || token == CPP_3DOTS) |
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153 | have_arg_list = 1; |
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154 | } |
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155 | recognized_function (pfile->token_buffer + prev_id_start, |
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156 | prev_id_end - prev_id_start, |
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157 | (saw_inline ? 'I' |
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158 | : in_extern_C_brace || current_extern_C |
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159 | ? 'F' : 'f'), |
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160 | pfile->token_buffer, prev_id_start, |
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161 | have_arg_list, |
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162 | fbuf->nominal_fname, func_lineno); |
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163 | token = cpp_get_non_space_token (pfile); |
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164 | if (token == CPP_LBRACE) |
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165 | { |
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166 | /* skip body of (normally) inline function */ |
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167 | skip_to_closing_brace (pfile); |
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168 | goto new_statement; |
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169 | } |
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170 | goto maybe_handle_comma; |
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171 | } |
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172 | break; |
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173 | case CPP_OTHER: |
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174 | if (CPP_WRITTEN (pfile) == start_written + 1 |
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175 | && (CPP_PWRITTEN (pfile)[-1] == '*' |
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176 | || CPP_PWRITTEN (pfile)[-1] == '&')) |
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177 | declarator_start = start_written; |
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178 | else |
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179 | goto handle_statement; |
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180 | break; |
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181 | case CPP_COMMA: |
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182 | case CPP_SEMICOLON: |
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183 | if (prev_id_start && saw_extern) |
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184 | { |
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185 | recognized_extern (pfile->token_buffer + prev_id_start, |
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186 | prev_id_end - prev_id_start, |
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187 | pfile->token_buffer, |
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188 | prev_id_start); |
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189 | } |
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190 | /* ... fall through ... */ |
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191 | maybe_handle_comma: |
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192 | if (token != CPP_COMMA) |
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193 | goto new_statement; |
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194 | handle_comma: |
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195 | /* Handle multiple declarators in a single declaration, |
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196 | as in: extern char *strcpy (), *strcat (), ... ; */ |
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197 | if (declarator_start == 0) |
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198 | declarator_start = prev_id_start; |
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199 | CPP_SET_WRITTEN (pfile, declarator_start); |
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200 | break; |
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201 | case CPP_NAME: |
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202 | /* "inline" and "extern" are recognized but skipped */ |
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203 | if (strcmp (pfile->token_buffer, "inline") == 0) |
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204 | { |
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205 | saw_inline = 1; |
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206 | CPP_SET_WRITTEN (pfile, start_written); |
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207 | } |
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208 | if (strcmp (pfile->token_buffer, "extern") == 0) |
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209 | { |
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210 | saw_extern = 1; |
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211 | CPP_SET_WRITTEN (pfile, start_written); |
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212 | token = cpp_get_non_space_token (pfile); |
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213 | if (token == CPP_STRING |
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214 | && strcmp (pfile->token_buffer, "\"C\"") == 0) |
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215 | { |
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216 | CPP_SET_WRITTEN (pfile, start_written); |
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217 | current_extern_C = 1; |
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218 | token = cpp_get_non_space_token (pfile); |
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219 | if (token == CPP_LBRACE) |
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220 | { |
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221 | brace_nesting++; |
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222 | extern_C_braces[extern_C_braces_length++] |
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223 | = brace_nesting; |
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224 | goto new_statement; |
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225 | } |
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226 | } |
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227 | else |
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228 | goto handle_token; |
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229 | break; |
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230 | } |
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231 | /* This may be the name of a variable or function. */ |
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232 | prev_id_start = start_written; |
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233 | prev_id_end = CPP_WRITTEN (pfile); |
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234 | break; |
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235 | |
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236 | case CPP_EOF: |
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237 | return; /* ??? FIXME */ |
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238 | |
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239 | case CPP_LBRACE: case CPP_RBRACE: case CPP_DIRECTIVE: |
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240 | goto new_statement; /* handle_statement? */ |
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241 | |
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242 | case CPP_HSPACE: case CPP_VSPACE: case CPP_COMMENT: case CPP_POP: |
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243 | /* Skip initial white space. */ |
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244 | if (start_written == 0) |
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245 | CPP_SET_WRITTEN (pfile, 0); |
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246 | break; |
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247 | |
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248 | default: |
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249 | prev_id_start = 0; |
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250 | } |
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251 | } |
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252 | } |
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