/* scan-decls.c - Extracts declarations from cpp output.
- Copyright (C) 1993 Free Software Foundation, Inc.
+ Copyright (C) 1993, 1995 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
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
-Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Written by Per Bothner <bothner@cygnus.com>, July 1993. */
-#ifdef OLD
-#endif
-
#include <stdio.h>
#include <ctype.h>
-#include "scan.h"
-
-sstring buf;
-sstring rtype;
-sstring arg_list;
+#include "hconfig.h"
+#include "cpplib.h"
int brace_nesting = 0;
int current_extern_C = 0;
static void
-skip_to_closing_brace (fp)
- FILE *fp;
+skip_to_closing_brace (pfile)
+ cpp_reader *pfile;
{
int nesting = 1;
for (;;)
{
- int c = get_token (fp, &buf);
- if (c == EOF)
+ enum cpp_token token = cpp_get_token (pfile);
+ if (token == CPP_EOF)
break;
- if (c == '{')
+ if (token == CPP_LBRACE)
nesting++;
- if (c == '}' && --nesting == 0)
+ 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 certain
- other interesting sequences (external variables and macros). */
+ 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 (fp)
- FILE *fp;
+scan_decls (pfile, argc, argv)
+ cpp_reader *pfile;
+ int argc;
+ char **argv;
{
- int c;
int saw_extern, saw_inline;
+ int old_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:
- c = get_token (fp, &buf);
+ CPP_SET_WRITTEN (pfile, 0);
+ token = cpp_get_token (pfile);
+
handle_statement:
current_extern_C = 0;
saw_extern = 0;
saw_inline = 0;
- if (c == '}')
+ if (token == CPP_RBRACE)
{
/* Pop an 'extern "C"' nesting level, if appropriate. */
if (extern_C_braces_length
brace_nesting--;
goto new_statement;
}
- if (c == '{')
+ if (token == CPP_LBRACE)
{
brace_nesting++;
goto new_statement;
}
- if (c == EOF)
+ if (token == CPP_EOF)
return 0;
- if (c == ';')
+ if (token == CPP_SEMICOLON)
goto new_statement;
- if (c != IDENTIFIER_TOKEN)
+ if (token != CPP_NAME)
goto new_statement;
- rtype.ptr = rtype.base;
- if (SSTRING_LENGTH (&buf) > 16
- && strncmp (buf.base, "__DEFINED_MACRO_", 16) == 0)
- {
- /* For certain interesting macro names, fixproto puts
- #ifdef FOO
- __DEFINED_MACRO_FOO
- #endif
- into the file to be pre-processed. So if we see __DEFINED_MACRO_FOO,
- it means FOO was defined, which we may want to make a note of. */
- recognized_macro (buf.base+16);
- goto new_statement;
- }
- if (strcmp (buf.base, "inline") == 0)
- {
- saw_inline = 1;
- c = get_token (fp, &buf);
- }
- if (strcmp (buf.base, "extern") == 0)
- {
- saw_extern = 1;
- c = get_token (fp, &buf);
- if (c == STRING_TOKEN && strcmp (buf.base, "C") == 0)
- {
- current_extern_C = 1;
- c = get_token (fp, &buf);
- if (c == '{')
- {
- brace_nesting++;
- extern_C_braces[extern_C_braces_length++] = brace_nesting;
- goto new_statement;
- }
- c = get_token (fp, &buf);
- }
- }
+
+ prev_id_start = 0;
+ declarator_start = 0;
for (;;)
{
- int followingc = getc (fp); /* char following token in buf */
-
- MAKE_SSTRING_SPACE (&rtype, 1);
- *rtype.ptr = 0;
-
- if (c == IDENTIFIER_TOKEN)
+ int start_written = CPP_WRITTEN (pfile);
+ token = cpp_get_token (pfile);
+ handle_token:
+ switch (token)
{
- int nextc = skip_spaces (fp, followingc);
- if (nextc == '(')
+ case CPP_LPAREN:
+ /* Looks like this is the start of a formal parameter list. */
+ if (prev_id_start)
{
int nesting = 1;
- int func_lineno = source_lineno;
- char *args;
-
- arg_list.ptr = arg_list.base;
+ 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 (;;)
{
- c = getc (fp);
- if (c == '(')
+ token = cpp_get_token (pfile);
+ if (token == CPP_LPAREN)
nesting++;
- else if (c == ')')
- if (--nesting == 0)
- break;
- if (c == EOF)
- break;
- if (c == '\n')
+ else if (token == CPP_RPAREN)
{
- c = ' ';
- source_lineno++;
- lineno++;
+ nesting--;
+ if (nesting == 0)
+ break;
}
- SSTRING_PUT (&arg_list, c);
+ else if (token == CPP_EOF)
+ break;
+ else if (token == CPP_NAME || token == CPP_3DOTS)
+ have_arg_list = 1;
}
- SSTRING_PUT (&arg_list, '\0');
- args = arg_list.base;
- while (*args == ' ')
- args++;
- recognized_function (buf.base,
+ 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'),
- rtype.base, args,
- source_filename.base, func_lineno);
- c = get_token (fp, &buf);
- if (c == '{')
+ 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 (fp);
+ skip_to_closing_brace (pfile);
goto new_statement;
}
- goto handle_statement;
+ goto maybe_handle_comma;
}
- else if (nextc == ';' && saw_extern)
+ break;
+ case CPP_OTHER:
+ if (CPP_WRITTEN (pfile) == 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 (buf.base, rtype.base);
- goto handle_statement;
+ recognized_extern (pfile->token_buffer + prev_id_start,
+ prev_id_end - prev_id_start,
+ pfile->token_buffer,
+ prev_id_start);
}
- else
- ungetc (nextc, fp);
+ /* ... fall through ... */
+ maybe_handle_comma:
+ if (token != CPP_COMMA)
+ goto new_statement;
+ handle_comma:
+ /* 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
+ goto handle_token;
+ 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; /* ??? FIXME */
+
+ 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;
}
- else if (followingc != EOF)
- ungetc (followingc, fp);
- if (c == ';' || c == '{' || c == '}' || c == EOF)
- goto handle_statement;
- sstring_append (&rtype, &buf);
- if (followingc == ' ' || followingc == '\t' || followingc == '\n')
- SSTRING_PUT (&rtype, ' ');
- c = get_token (fp, &buf);
}
}
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