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/* scan-decls.c - Extracts declarations from cpp output.
Copyright (C) 1993, 1995, 1997, 1998,
1999, 2000 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 *));
static const cpp_token *get_a_token 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;
/* Get a token but skip padding. */
static const cpp_token *
get_a_token (pfile)
cpp_reader *pfile;
{
for (;;)
{
const cpp_token *result = cpp_get_token (pfile);
if (result->type != CPP_PADDING)
return result;
}
}
static void
skip_to_closing_brace (pfile)
cpp_reader *pfile;
{
int nesting = 1;
for (;;)
{
enum cpp_ttype token = get_a_token (pfile)->type;
if (token == CPP_EOF)
break;
if (token == CPP_OPEN_BRACE)
nesting++;
if (token == CPP_CLOSE_BRACE && --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;
cpp_token prev_id;
const cpp_token *token;
new_statement:
token = get_a_token (pfile);
handle_statement:
current_extern_C = 0;
saw_extern = 0;
saw_inline = 0;
if (token->type == CPP_OPEN_BRACE)
{
/* 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->type == CPP_OPEN_BRACE)
{
brace_nesting++;
goto new_statement;
}
if (token->type == CPP_EOF)
return 0;
if (token->type == CPP_SEMICOLON)
goto new_statement;
if (token->type != CPP_NAME)
goto new_statement;
prev_id.type = CPP_EOF;
for (;;)
{
switch (token->type)
{
default:
goto handle_statement;
case CPP_MULT:
case CPP_AND:
/* skip */
break;
case CPP_COMMA:
case CPP_SEMICOLON:
if (prev_id.type != CPP_EOF && saw_extern)
{
recognized_extern (&prev_id);
}
if (token->type == CPP_COMMA)
break;
/* ... fall through ... */
case CPP_OPEN_BRACE: case CPP_CLOSE_BRACE:
goto new_statement;
case CPP_EOF:
return 0;
case CPP_OPEN_PAREN:
/* Looks like this is the start of a formal parameter list. */
if (prev_id.type != CPP_EOF)
{
int nesting = 1;
int have_arg_list = 0;
for (;;)
{
token = get_a_token (pfile);
if (token->type == CPP_OPEN_PAREN)
nesting++;
else if (token->type == CPP_CLOSE_PAREN)
{
nesting--;
if (nesting == 0)
break;
}
else if (token->type == CPP_EOF)
break;
else if (token->type == CPP_NAME
|| token->type == CPP_ELLIPSIS)
have_arg_list = 1;
}
recognized_function (&prev_id, token->line,
(saw_inline ? 'I'
: in_extern_C_brace || current_extern_C
? 'F' : 'f'), have_arg_list);
token = get_a_token (pfile);
if (token->type == CPP_OPEN_BRACE)
{
/* skip body of (normally) inline function */
skip_to_closing_brace (pfile);
goto new_statement;
}
/* skip a possible __attribute__ or throw expression after the
parameter list */
while (token->type != CPP_SEMICOLON && token->type != CPP_EOF)
token = get_a_token (pfile);
goto new_statement;
}
break;
case CPP_NAME:
/* "inline" and "extern" are recognized but skipped */
if (cpp_ideq (token, "inline"))
{
saw_inline = 1;
}
else if (cpp_ideq (token, "extern"))
{
saw_extern = 1;
token = get_a_token (pfile);
if (token->type == CPP_STRING
&& token->val.str.len == 1
&& token->val.str.text[0] == 'C')
{
current_extern_C = 1;
token = get_a_token (pfile);
if (token->type == CPP_OPEN_BRACE)
{
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 = *token;
break;
}
token = get_a_token (pfile);
}
}
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