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/* gen-protos.c - massages a list of prototypes, for use by fixproto.
Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2003, 2004, 2005, 2007
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 3, 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; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "bconfig.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "scan.h"
#include "errors.h"
int verbose = 0;
static void add_hash (const char *);
static int parse_fn_proto (char *, char *, struct fn_decl *);
#define HASH_SIZE 2503 /* a prime */
int hash_tab[HASH_SIZE];
int next_index;
int collisions;
static void
add_hash (const char *fname)
{
int i, i0;
/* NOTE: If you edit this, also edit lookup_std_proto in fix-header.c !! */
i = hashstr (fname, strlen (fname)) % HASH_SIZE;
i0 = i;
if (hash_tab[i] != 0)
{
collisions++;
for (;;)
{
i = (i+1) % HASH_SIZE;
gcc_assert (i != i0);
if (hash_tab[i] == 0)
break;
}
}
hash_tab[i] = next_index;
next_index++;
}
/* Given a function prototype, fill in the fields of FN.
The result is a boolean indicating if a function prototype was found.
The input string is modified (trailing NULs are inserted).
The fields of FN point to the input string. */
static int
parse_fn_proto (char *start, char *end, struct fn_decl *fn)
{
char *ptr;
int param_nesting = 1;
char *param_start, *param_end, *decl_start, *name_start, *name_end;
ptr = end - 1;
while (*ptr == ' ' || *ptr == '\t') ptr--;
if (*ptr-- != ';')
{
fprintf (stderr, "Funny input line: %s\n", start);
return 0;
}
while (*ptr == ' ' || *ptr == '\t') ptr--;
if (*ptr != ')')
{
fprintf (stderr, "Funny input line: %s\n", start);
return 0;
}
param_end = ptr;
for (;;)
{
int c = *--ptr;
if (c == '(' && --param_nesting == 0)
break;
else if (c == ')')
param_nesting++;
}
param_start = ptr+1;
ptr--;
while (*ptr == ' ' || *ptr == '\t') ptr--;
if (!ISALNUM ((unsigned char)*ptr))
{
if (verbose)
fprintf (stderr, "%s: Can't handle this complex prototype: %s\n",
progname, start);
return 0;
}
name_end = ptr+1;
while (ISIDNUM (*ptr))
--ptr;
name_start = ptr+1;
while (*ptr == ' ' || *ptr == '\t') ptr--;
ptr[1] = 0;
*param_end = 0;
*name_end = 0;
decl_start = start;
if (strncmp (decl_start, "typedef ", 8) == 0)
return 0;
if (strncmp (decl_start, "extern ", 7) == 0)
decl_start += 7;
fn->fname = name_start;
fn->rtype = decl_start;
fn->params = param_start;
return 1;
}
int
main (int argc ATTRIBUTE_UNUSED, char **argv)
{
FILE *inf = stdin;
FILE *outf = stdout;
int i;
sstring linebuf;
struct fn_decl fn_decl;
i = strlen (argv[0]);
while (i > 0 && argv[0][i-1] != '/') --i;
progname = &argv[0][i];
/* Unlock the stdio streams. */
unlock_std_streams ();
INIT_SSTRING (&linebuf);
fprintf (outf, "struct fn_decl std_protos[] = {\n");
/* A hash table entry of 0 means "unused" so reserve it. */
fprintf (outf, " {\"\", \"\", \"\", 0},\n");
next_index = 1;
for (;;)
{
int c = skip_spaces (inf, ' ');
if (c == EOF)
break;
linebuf.ptr = linebuf.base;
ungetc (c, inf);
c = read_upto (inf, &linebuf, '\n');
if (linebuf.base[0] == '#') /* skip cpp command */
continue;
if (linebuf.base[0] == '\0') /* skip empty line */
continue;
if (! parse_fn_proto (linebuf.base, linebuf.ptr, &fn_decl))
continue;
add_hash (fn_decl.fname);
fprintf (outf, " {\"%s\", \"%s\", \"%s\", 0},\n",
fn_decl.fname, fn_decl.rtype, fn_decl.params);
if (c == EOF)
break;
}
fprintf (outf, " {0, 0, 0, 0}\n};\n");
fprintf (outf, "#define HASH_SIZE %d\n", HASH_SIZE);
fprintf (outf, "short hash_tab[HASH_SIZE] = {\n");
for (i = 0; i < HASH_SIZE; i++)
fprintf (outf, " %d,\n", hash_tab[i]);
fprintf (outf, "};\n");
fprintf (stderr, "gen-protos: %d entries %d collisions\n",
next_index, collisions);
return 0;
}
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