[8833] | 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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