255 lines
6.7 KiB
C
255 lines
6.7 KiB
C
/* scan-decls.c - Extracts declarations from cpp output.
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Copyright (C) 1993, 1995, 1997, 1998 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Written by Per Bothner <bothner@cygnus.com>, July 1993. */
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#include "hconfig.h"
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#include "system.h"
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#include "gansidecl.h"
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#include "cpplib.h"
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#include "scan.h"
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int brace_nesting = 0;
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/* The first extern_C_braces_length elements of extern_C_braces
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indicate the (brace nesting levels of) left braces that were
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prefixed by extern "C". */
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int extern_C_braces_length = 0;
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char extern_C_braces[20];
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#define in_extern_C_brace (extern_C_braces_length>0)
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/* True if the function declaration currently being scanned is
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prefixed by extern "C". */
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int current_extern_C = 0;
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static void
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skip_to_closing_brace (pfile)
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cpp_reader *pfile;
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{
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int nesting = 1;
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for (;;)
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{
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enum cpp_token token = cpp_get_token (pfile);
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if (token == CPP_EOF)
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break;
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if (token == CPP_LBRACE)
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nesting++;
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if (token == CPP_RBRACE && --nesting == 0)
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break;
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}
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}
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/* This function scans a C source file (actually, the output of cpp),
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reading from FP. It looks for function declarations, and
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external variable declarations.
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The following grammar (as well as some extra stuff) is recognized:
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declaration:
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(decl-specifier)* declarator ("," declarator)* ";"
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decl-specifier:
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identifier
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keyword
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extern "C"
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declarator:
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(ptr-operator)* dname [ "(" argument-declaration-list ")" ]
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ptr-operator:
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("*" | "&") ("const" | "volatile")*
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dname:
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identifier
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Here dname is the actual name being declared.
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*/
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int
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scan_decls (pfile, argc, argv)
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cpp_reader *pfile;
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int argc;
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char **argv;
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{
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int saw_extern, saw_inline;
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int start_written;
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/* If declarator_start is non-zero, it marks the start of the current
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declarator. If it is zero, we are either still parsing the
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decl-specs, or prev_id_start marks the start of the declarator. */
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int declarator_start;
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int prev_id_start, prev_id_end;
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enum cpp_token token;
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new_statement:
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CPP_SET_WRITTEN (pfile, 0);
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start_written = 0;
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token = cpp_get_token (pfile);
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handle_statement:
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current_extern_C = 0;
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saw_extern = 0;
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saw_inline = 0;
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if (token == CPP_RBRACE)
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{
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/* Pop an 'extern "C"' nesting level, if appropriate. */
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if (extern_C_braces_length
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&& extern_C_braces[extern_C_braces_length - 1] == brace_nesting)
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extern_C_braces_length--;
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brace_nesting--;
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goto new_statement;
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}
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if (token == CPP_LBRACE)
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{
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brace_nesting++;
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goto new_statement;
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}
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if (token == CPP_EOF)
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return 0;
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if (token == CPP_SEMICOLON)
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goto new_statement;
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if (token != CPP_NAME)
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goto new_statement;
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prev_id_start = 0;
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declarator_start = 0;
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for (;;)
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{
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switch (token)
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{
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case CPP_LPAREN:
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/* Looks like this is the start of a formal parameter list. */
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if (prev_id_start)
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{
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int nesting = 1;
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int have_arg_list = 0;
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cpp_buffer *fbuf = cpp_file_buffer (pfile);
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long func_lineno;
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cpp_buf_line_and_col (fbuf, &func_lineno, NULL);
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for (;;)
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{
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token = cpp_get_token (pfile);
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if (token == CPP_LPAREN)
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nesting++;
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else if (token == CPP_RPAREN)
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{
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nesting--;
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if (nesting == 0)
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break;
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}
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else if (token == CPP_EOF)
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break;
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else if (token == CPP_NAME || token == CPP_3DOTS)
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have_arg_list = 1;
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}
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recognized_function (pfile->token_buffer + prev_id_start,
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prev_id_end - prev_id_start,
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(saw_inline ? 'I'
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: in_extern_C_brace || current_extern_C
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? 'F' : 'f'),
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pfile->token_buffer, prev_id_start,
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have_arg_list,
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fbuf->nominal_fname, func_lineno);
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token = cpp_get_non_space_token (pfile);
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if (token == CPP_LBRACE)
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{
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/* skip body of (normally) inline function */
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skip_to_closing_brace (pfile);
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goto new_statement;
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}
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goto maybe_handle_comma;
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}
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break;
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case CPP_OTHER:
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if (CPP_WRITTEN (pfile) == start_written + 1
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&& (CPP_PWRITTEN (pfile)[-1] == '*'
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|| CPP_PWRITTEN (pfile)[-1] == '&'))
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declarator_start = start_written;
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else
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goto handle_statement;
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break;
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case CPP_COMMA:
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case CPP_SEMICOLON:
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if (prev_id_start && saw_extern)
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{
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recognized_extern (pfile->token_buffer + prev_id_start,
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prev_id_end - prev_id_start,
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pfile->token_buffer,
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prev_id_start);
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}
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/* ... fall through ... */
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maybe_handle_comma:
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if (token != CPP_COMMA)
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goto new_statement;
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handle_comma:
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/* Handle multiple declarators in a single declaration,
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as in: extern char *strcpy (), *strcat (), ... ; */
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if (declarator_start == 0)
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declarator_start = prev_id_start;
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CPP_SET_WRITTEN (pfile, declarator_start);
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break;
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case CPP_NAME:
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/* "inline" and "extern" are recognized but skipped */
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if (strcmp (pfile->token_buffer, "inline") == 0)
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{
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saw_inline = 1;
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CPP_SET_WRITTEN (pfile, start_written);
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}
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if (strcmp (pfile->token_buffer, "extern") == 0)
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{
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saw_extern = 1;
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CPP_SET_WRITTEN (pfile, start_written);
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token = cpp_get_non_space_token (pfile);
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if (token == CPP_STRING
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&& strcmp (pfile->token_buffer, "\"C\"") == 0)
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{
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CPP_SET_WRITTEN (pfile, start_written);
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current_extern_C = 1;
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token = cpp_get_non_space_token (pfile);
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if (token == CPP_LBRACE)
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{
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brace_nesting++;
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extern_C_braces[extern_C_braces_length++]
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= brace_nesting;
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goto new_statement;
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}
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}
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else
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continue;
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break;
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}
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/* This may be the name of a variable or function. */
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prev_id_start = start_written;
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prev_id_end = CPP_WRITTEN (pfile);
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break;
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case CPP_EOF:
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return 0;
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case CPP_LBRACE: case CPP_RBRACE: case CPP_DIRECTIVE:
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goto new_statement; /* handle_statement? */
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case CPP_HSPACE: case CPP_VSPACE: case CPP_COMMENT: case CPP_POP:
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/* Skip initial white space. */
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if (start_written == 0)
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CPP_SET_WRITTEN (pfile, 0);
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break;
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default:
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prev_id_start = 0;
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}
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start_written = CPP_WRITTEN (pfile);
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token = cpp_get_token (pfile);
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}
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}
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