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/* scan-decls.c - Extracts declarations from cpp output.
Copyright (C) 1993, 1995, 97-98, 1999 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Written by Per Bothner <bothner@cygnus.com>, July 1993. */
#include "hconfig.h"
#include "system.h"
#include "cpplib.h"
#include "scan.h"
static void skip_to_closing_brace PARAMS ((cpp_reader *));
int brace_nesting = 0;
/* The first extern_C_braces_length elements of extern_C_braces
indicate the (brace nesting levels of) left braces that were
prefixed by extern "C". */
int extern_C_braces_length = 0;
char extern_C_braces[20];
#define in_extern_C_brace (extern_C_braces_length>0)
/* True if the function declaration currently being scanned is
prefixed by extern "C". */
int current_extern_C = 0;
static void
skip_to_closing_brace (pfile)
cpp_reader *pfile;
{
int nesting = 1;
for (;;)
{
enum cpp_token token = cpp_get_token (pfile);
if (token == CPP_EOF)
break;
if (token == CPP_LBRACE)
nesting++;
if (token == CPP_RBRACE && --nesting == 0)
break;
}
}
/* This function scans a C source file (actually, the output of cpp),
reading from FP. It looks for function declarations, and
external variable declarations.
The following grammar (as well as some extra stuff) is recognized:
declaration:
(decl-specifier)* declarator ("," declarator)* ";"
decl-specifier:
identifier
keyword
extern "C"
declarator:
(ptr-operator)* dname [ "(" argument-declaration-list ")" ]
ptr-operator:
("*" | "&") ("const" | "volatile")*
dname:
identifier
Here dname is the actual name being declared.
*/
int
scan_decls (pfile, argc, argv)
cpp_reader *pfile;
int argc ATTRIBUTE_UNUSED;
char **argv ATTRIBUTE_UNUSED;
{
int saw_extern, saw_inline;
int start_written;
/* If declarator_start is non-zero, it marks the start of the current
declarator. If it is zero, we are either still parsing the
decl-specs, or prev_id_start marks the start of the declarator. */
int declarator_start;
int prev_id_start, prev_id_end;
enum cpp_token token;
new_statement:
CPP_SET_WRITTEN (pfile, 0);
start_written = 0;
token = cpp_get_token (pfile);
handle_statement:
current_extern_C = 0;
saw_extern = 0;
saw_inline = 0;
if (token == CPP_RBRACE)
{
/* Pop an 'extern "C"' nesting level, if appropriate. */
if (extern_C_braces_length
&& extern_C_braces[extern_C_braces_length - 1] == brace_nesting)
extern_C_braces_length--;
brace_nesting--;
goto new_statement;
}
if (token == CPP_LBRACE)
{
brace_nesting++;
goto new_statement;
}
if (token == CPP_EOF)
return 0;
if (token == CPP_SEMICOLON)
goto new_statement;
if (token != CPP_NAME)
goto new_statement;
prev_id_start = 0;
declarator_start = 0;
for (;;)
{
switch (token)
{
case CPP_LPAREN:
/* Looks like this is the start of a formal parameter list. */
if (prev_id_start)
{
int nesting = 1;
int have_arg_list = 0;
cpp_buffer *fbuf = cpp_file_buffer (pfile);
long func_lineno;
cpp_buf_line_and_col (fbuf, &func_lineno, NULL);
for (;;)
{
token = cpp_get_token (pfile);
if (token == CPP_LPAREN)
nesting++;
else if (token == CPP_RPAREN)
{
nesting--;
if (nesting == 0)
break;
}
else if (token == CPP_EOF)
break;
else if (token == CPP_NAME || token == CPP_3DOTS)
have_arg_list = 1;
}
recognized_function (pfile->token_buffer + prev_id_start,
prev_id_end - prev_id_start,
(saw_inline ? 'I'
: in_extern_C_brace || current_extern_C
? 'F' : 'f'),
pfile->token_buffer, prev_id_start,
have_arg_list,
fbuf->nominal_fname, func_lineno);
token = cpp_get_non_space_token (pfile);
if (token == CPP_LBRACE)
{
/* skip body of (normally) inline function */
skip_to_closing_brace (pfile);
goto new_statement;
}
goto maybe_handle_comma;
}
break;
case CPP_OTHER:
if (CPP_WRITTEN (pfile) == (size_t) start_written + 1
&& (CPP_PWRITTEN (pfile)[-1] == '*'
|| CPP_PWRITTEN (pfile)[-1] == '&'))
declarator_start = start_written;
else
goto handle_statement;
break;
case CPP_COMMA:
case CPP_SEMICOLON:
if (prev_id_start && saw_extern)
{
recognized_extern (pfile->token_buffer + prev_id_start,
prev_id_end - prev_id_start,
pfile->token_buffer,
prev_id_start);
}
/* ... fall through ... */
maybe_handle_comma:
if (token != CPP_COMMA)
goto new_statement;
#if 0
handle_comma:
#endif
/* Handle multiple declarators in a single declaration,
as in: extern char *strcpy (), *strcat (), ... ; */
if (declarator_start == 0)
declarator_start = prev_id_start;
CPP_SET_WRITTEN (pfile, declarator_start);
break;
case CPP_NAME:
/* "inline" and "extern" are recognized but skipped */
if (strcmp (pfile->token_buffer, "inline") == 0)
{
saw_inline = 1;
CPP_SET_WRITTEN (pfile, start_written);
}
if (strcmp (pfile->token_buffer, "extern") == 0)
{
saw_extern = 1;
CPP_SET_WRITTEN (pfile, start_written);
token = cpp_get_non_space_token (pfile);
if (token == CPP_STRING
&& strcmp (pfile->token_buffer, "\"C\"") == 0)
{
CPP_SET_WRITTEN (pfile, start_written);
current_extern_C = 1;
token = cpp_get_non_space_token (pfile);
if (token == CPP_LBRACE)
{
brace_nesting++;
extern_C_braces[extern_C_braces_length++]
= brace_nesting;
goto new_statement;
}
}
else
continue;
break;
}
/* This may be the name of a variable or function. */
prev_id_start = start_written;
prev_id_end = CPP_WRITTEN (pfile);
break;
case CPP_EOF:
return 0;
case CPP_LBRACE: case CPP_RBRACE: case CPP_DIRECTIVE:
goto new_statement; /* handle_statement? */
case CPP_HSPACE: case CPP_VSPACE: case CPP_COMMENT: case CPP_POP:
/* Skip initial white space. */
if (start_written == 0)
CPP_SET_WRITTEN (pfile, 0);
break;
default:
prev_id_start = 0;
}
start_written = CPP_WRITTEN (pfile);
token = cpp_get_token (pfile);
}
}
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