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/* basic_blocks.c - Basic-block level related code: reading/writing
of basic-block info to/from gmon.out; computing and formatting of
basic-block related statistics.
Copyright (C) 1999-2025 Free Software Foundation, Inc.
This file is part of GNU Binutils.
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 of the License, 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, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include "config.h"
#include "util.h"
#include "Elf.h" /* link to bfd.h fixes bfd* */
#include "gp-gmon.h"
#include "basic_blocks.h"
#include "gmon_io.h"
#include "gmon_out.h"
#include "symtab.h"
/* Skip over variable length string. */
static void
fskip_string (FILE *fp)
{
int ch;
while ((ch = fgetc (fp)) != EOF)
{
if (ch == '\0')
break;
}
}
/* Read a basic-block record from file IFP. FILENAME is the name
of file IFP and is provided for formatting error-messages only. */
void
bb_read_rec (FILE *ifp, const char *filename,
bool line_granularity, const char *whoami)
{
unsigned int nblocks, b;
bfd_vma addr, ncalls;
Sym *sym;
Sym_Table *symtab;
if (gmon_io_read_32 (ifp, &nblocks))
{
fprintf (stderr, "%s: %s: unexpected end of file\n",
whoami, filename);
done (1);
}
symtab = get_symtab (whoami);
nblocks = bfd_get_32 (core_bfd, (bfd_byte *) & nblocks);
if (gmon_file_version == 0)
fskip_string (ifp);
for (b = 0; b < nblocks; ++b)
{
if (gmon_file_version == 0)
{
int line_num;
/* Version 0 had lots of extra stuff that we don't
care about anymore. */
if ((fread (&ncalls, sizeof (ncalls), 1, ifp) != 1)
|| (fread (&addr, sizeof (addr), 1, ifp) != 1)
|| (fskip_string (ifp), false)
|| (fskip_string (ifp), false)
|| (fread (&line_num, sizeof (line_num), 1, ifp) != 1))
{
perror (filename);
done (1);
}
}
else if (gmon_io_read_vma (ifp, &addr, whoami)
|| gmon_io_read_vma (ifp, &ncalls, whoami))
{
perror (filename);
done (1);
}
/* Basic-block execution counts are meaningful only if we're
profiling at the line-by-line level: */
if (line_granularity)
{
sym = sym_lookup (symtab, addr);
if (sym)
{
int i;
DBG (BBDEBUG,
printf ("[bb_read_rec] 0x%lx->0x%lx (%s:%d) cnt=%lu\n",
(unsigned long) addr, (unsigned long) sym->addr,
sym->name, sym->line_num, (unsigned long) ncalls));
for (i = 0; i < NBBS; i++)
{
if (! sym->bb_addr[i] || sym->bb_addr[i] == addr)
{
sym->bb_addr[i] = addr;
sym->bb_calls[i] += ncalls;
break;
}
}
}
}
else
{
static bool user_warned = false;
if (!user_warned)
{
user_warned = true;
fprintf (stderr,
"%s: warning: ignoring basic-block exec counts (use -l or --line)\n",
whoami);
}
}
}
return;
}
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