Copyright 1999, 2000, 2001, 2002, 2004, 2005
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 2 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 "libiberty.h"
#include "gprof.h"
#include "search_list.h"
#include "source.h"
#include "symtab.h"
#include "corefile.h"
#include "gmon_io.h"
#include "gmon_out.h"
#include "hist.h"
#include "sym_ids.h"
#include "utils.h"
#define UNITS_TO_CODE (offset_to_code / sizeof(UNIT))
static void scale_and_align_entries (void);
static void print_header (int);
static void print_line (Sym *, double);
static int cmp_time (const PTR, const PTR);
extern void flat_blurb (FILE * fp);
bfd_vma s_lowpc;
bfd_vma s_highpc = 0;
bfd_vma lowpc, highpc;
unsigned int hist_num_bins = 0;
int *hist_sample = 0;
double hist_scale;
static char hist_dimension[16] = "seconds";
static char hist_dimension_abbrev = 's';
static double accum_time;
static double total_time;
scale some of the values in the flat profile). */
const struct
{
char prefix;
double scale;
}
SItab[] =
{
{ 'T', 1e-12 },
{ 'G', 1e-09 },
{ 'M', 1e-06 },
{ 'K', 1e-03 },
{ ' ', 1e-00 },
{ 'm', 1e+03 },
{ 'u', 1e+06 },
{ 'n', 1e+09 },
{ 'p', 1e+12 },
{ 'f', 1e+15 },
{ 'a', 1e+18 }
};
is provided for formatting error messages only. */
void
hist_read_rec (FILE * ifp, const char *filename)
{
bfd_vma n_lowpc, n_highpc;
unsigned int i, ncnt, profrate;
UNIT count;
if (gmon_io_read_vma (ifp, &n_lowpc)
|| gmon_io_read_vma (ifp, &n_highpc)
|| gmon_io_read_32 (ifp, &ncnt)
|| gmon_io_read_32 (ifp, &profrate)
|| gmon_io_read (ifp, hist_dimension, 15)
|| gmon_io_read (ifp, &hist_dimension_abbrev, 1))
{
fprintf (stderr, _("%s: %s: unexpected end of file\n"),
whoami, filename);
done (1);
}
if (!s_highpc)
{
s_lowpc = n_lowpc;
s_highpc = n_highpc;
lowpc = (bfd_vma) n_lowpc / sizeof (UNIT);
highpc = (bfd_vma) n_highpc / sizeof (UNIT);
hist_num_bins = ncnt;
hz = profrate;
}
DBG (SAMPLEDEBUG,
printf ("[hist_read_rec] n_lowpc 0x%lx n_highpc 0x%lx ncnt %u\n",
(unsigned long) n_lowpc, (unsigned long) n_highpc, ncnt);
printf ("[hist_read_rec] s_lowpc 0x%lx s_highpc 0x%lx nsamples %u\n",
(unsigned long) s_lowpc, (unsigned long) s_highpc,
hist_num_bins);
printf ("[hist_read_rec] lowpc 0x%lx highpc 0x%lx\n",
(unsigned long) lowpc, (unsigned long) highpc));
if (n_lowpc != s_lowpc || n_highpc != s_highpc
|| ncnt != hist_num_bins || hz != (int) profrate)
{
fprintf (stderr, _("%s: `%s' is incompatible with first gmon file\n"),
whoami, filename);
done (1);
}
if (!hist_sample)
{
hist_sample = (int *) xmalloc (hist_num_bins * sizeof (hist_sample[0]));
memset (hist_sample, 0, hist_num_bins * sizeof (hist_sample[0]));
}
for (i = 0; i < hist_num_bins; ++i)
{
if (fread (&count[0], sizeof (count), 1, ifp) != 1)
{
fprintf (stderr,
_("%s: %s: unexpected EOF after reading %u of %u samples\n"),
whoami, filename, i, hist_num_bins);
done (1);
}
hist_sample[i] += bfd_get_16 (core_bfd, (bfd_byte *) & count[0]);
DBG (SAMPLEDEBUG,
printf ("[hist_read_rec] 0x%lx: %u\n",
(unsigned long) (n_lowpc + i * (n_highpc - n_lowpc) / ncnt),
hist_sample[i]));
}
}
of OFP and is provided for formatting error-messages only. */
void
hist_write_hist (FILE * ofp, const char *filename)
{
UNIT count;
unsigned int i;
if (gmon_io_write_8 (ofp, GMON_TAG_TIME_HIST)
|| gmon_io_write_vma (ofp, s_lowpc)
|| gmon_io_write_vma (ofp, s_highpc)
|| gmon_io_write_32 (ofp, hist_num_bins)
|| gmon_io_write_32 (ofp, hz)
|| gmon_io_write (ofp, hist_dimension, 15)
|| gmon_io_write (ofp, &hist_dimension_abbrev, 1))
{
perror (filename);
done (1);
}
for (i = 0; i < hist_num_bins; ++i)
{
bfd_put_16 (core_bfd, (bfd_vma) hist_sample[i], (bfd_byte *) &count[0]);
if (fwrite (&count[0], sizeof (count), 1, ofp) != 1)
{
perror (filename);
done (1);
}
}
}
hist_assign_samples), and, on architectures that have procedure
entry masks at the start of a function, possibly push the scaled
entry points over the procedure entry mask, if it turns out that
the entry point is in one bin and the code for a routine is in the
next bin. */
static void
scale_and_align_entries ()
{
Sym *sym;
bfd_vma bin_of_entry;
bfd_vma bin_of_code;
for (sym = symtab.base; sym < symtab.limit; sym++)
{
sym->hist.scaled_addr = sym->addr / sizeof (UNIT);
bin_of_entry = (sym->hist.scaled_addr - lowpc) / hist_scale;
bin_of_code = ((sym->hist.scaled_addr + UNITS_TO_CODE - lowpc)
/ hist_scale);
if (bin_of_entry < bin_of_code)
{
DBG (SAMPLEDEBUG,
printf ("[scale_and_align_entries] pushing 0x%lx to 0x%lx\n",
(unsigned long) sym->hist.scaled_addr,
(unsigned long) (sym->hist.scaled_addr
+ UNITS_TO_CODE)));
sym->hist.scaled_addr += UNITS_TO_CODE;
}
}
}
Histogram bin I covers some address range [BIN_LOWPC,BIN_HIGH_PC)
which may overlap one more symbol address ranges. If a symbol
overlaps with the bin's address range by O percent, then O percent
of the bin's count is credited to that symbol.
There are three cases as to where BIN_LOW_PC and BIN_HIGH_PC can be
with respect to the symbol's address range [SYM_LOW_PC,
SYM_HIGH_PC) as shown in the following diagram. OVERLAP computes
the distance (in UNITs) between the arrows, the fraction of the
sample that is to be credited to the symbol which starts at
SYM_LOW_PC.
sym_low_pc sym_high_pc
| |
v v
+-----------------------------------------------+
| |
| ->| |<- ->| |<- ->| |<- |
| | | | | |
+---------+ +---------+ +---------+
^ ^ ^ ^ ^ ^
| | | | | |
bin_low_pc bin_high_pc bin_low_pc bin_high_pc bin_low_pc bin_high_pc
For the VAX we assert that samples will never fall in the first two
bytes of any routine, since that is the entry mask, thus we call
scale_and_align_entries() to adjust the entry points if the entry
mask falls in one bin but the code for the routine doesn't start
until the next bin. In conjunction with the alignment of routine
addresses, this should allow us to have only one sample for every
four bytes of text space and never have any overlap (the two end
cases, above). */
void
hist_assign_samples ()
{
bfd_vma bin_low_pc, bin_high_pc;
bfd_vma sym_low_pc, sym_high_pc;
bfd_vma overlap, addr;
unsigned int bin_count;
unsigned int i, j;
double time, credit;
hist_scale = highpc - lowpc;
hist_scale /= hist_num_bins;
scale_and_align_entries ();
for (i = 0, j = 1; i < hist_num_bins; ++i)
{
bin_count = hist_sample[i];
if (! bin_count)
continue;
bin_low_pc = lowpc + (bfd_vma) (hist_scale * i);
bin_high_pc = lowpc + (bfd_vma) (hist_scale * (i + 1));
time = bin_count;
DBG (SAMPLEDEBUG,
printf (
"[assign_samples] bin_low_pc=0x%lx, bin_high_pc=0x%lx, bin_count=%u\n",
(unsigned long) (sizeof (UNIT) * bin_low_pc),
(unsigned long) (sizeof (UNIT) * bin_high_pc),
bin_count));
total_time += time;
for (j = j - 1; j < symtab.len; ++j)
{
sym_low_pc = symtab.base[j].hist.scaled_addr;
sym_high_pc = symtab.base[j + 1].hist.scaled_addr;
go for next bin. */
if (bin_high_pc < sym_low_pc)
break;
go for next symbol. */
if (bin_low_pc >= sym_high_pc)
continue;
overlap =
MIN (bin_high_pc, sym_high_pc) - MAX (bin_low_pc, sym_low_pc);
if (overlap > 0)
{
DBG (SAMPLEDEBUG,
printf (
"[assign_samples] [0x%lx,0x%lx) %s gets %f ticks %ld overlap\n",
(unsigned long) symtab.base[j].addr,
(unsigned long) (sizeof (UNIT) * sym_high_pc),
symtab.base[j].name, overlap * time / hist_scale,
(long) overlap));
addr = symtab.base[j].addr;
credit = overlap * time / hist_scale;
table is empty and it does not appear it in
EXCL_FLAT. */
if (sym_lookup (&syms[INCL_FLAT], addr)
|| (syms[INCL_FLAT].len == 0
&& !sym_lookup (&syms[EXCL_FLAT], addr)))
{
symtab.base[j].hist.time += credit;
}
else
{
total_time -= credit;
}
}
}
}
DBG (SAMPLEDEBUG, printf ("[assign_samples] total_time %f\n",
total_time));
}
static void
print_header (int prefix)
{
char unit[64];
sprintf (unit, _("%c%c/call"), prefix, hist_dimension_abbrev);
if (bsd_style_output)
{
printf (_("\ngranularity: each sample hit covers %ld byte(s)"),
(long) hist_scale * sizeof (UNIT));
if (total_time > 0.0)
{
printf (_(" for %.2f%% of %.2f %s\n\n"),
100.0 / total_time, total_time / hz, hist_dimension);
}
}
else
{
printf (_("\nEach sample counts as %g %s.\n"), 1.0 / hz, hist_dimension);
}
if (total_time <= 0.0)
{
printf (_(" no time accumulated\n\n"));
total_time = 1.0;
}
printf ("%5.5s %10.10s %8.8s %8.8s %8.8s %8.8s %-8.8s\n",
"% ", _("cumulative"), _("self "), "", _("self "), _("total "),
"");
printf ("%5.5s %9.9s %8.8s %8.8s %8.8s %8.8s %-8.8s\n",
_("time"), hist_dimension, hist_dimension, _("calls"), unit, unit,
_("name"));
}
static void
print_line (Sym *sym, double scale)
{
if (ignore_zeros && sym->ncalls == 0 && sym->hist.time == 0)
return;
accum_time += sym->hist.time;
if (bsd_style_output)
printf ("%5.1f %10.2f %8.2f",
total_time > 0.0 ? 100 * sym->hist.time / total_time : 0.0,
accum_time / hz, sym->hist.time / hz);
else
printf ("%6.2f %9.2f %8.2f",
total_time > 0.0 ? 100 * sym->hist.time / total_time : 0.0,
accum_time / hz, sym->hist.time / hz);
if (sym->ncalls != 0)
printf (" %8lu %8.2f %8.2f ",
sym->ncalls, scale * sym->hist.time / hz / sym->ncalls,
scale * (sym->hist.time + sym->cg.child_time) / hz / sym->ncalls);
else
printf (" %8.8s %8.8s %8.8s ", "", "", "");
if (bsd_style_output)
print_name (sym);
else
print_name_only (sym);
printf ("\n");
}
the secondary is number of invocation, and the tertiary is the
lexicographic order of the function names. */
static int
cmp_time (const PTR lp, const PTR rp)
{
const Sym *left = *(const Sym **) lp;
const Sym *right = *(const Sym **) rp;
double time_diff;
time_diff = right->hist.time - left->hist.time;
if (time_diff > 0.0)
return 1;
if (time_diff < 0.0)
return -1;
if (right->ncalls > left->ncalls)
return 1;
if (right->ncalls < left->ncalls)
return -1;
return strcmp (left->name, right->name);
}
void
hist_print ()
{
Sym **time_sorted_syms, *top_dog, *sym;
unsigned int index;
unsigned log_scale;
double top_time, time;
bfd_vma addr;
if (first_output)
first_output = FALSE;
else
printf ("\f\n");
accum_time = 0.0;
if (bsd_style_output)
{
if (print_descriptions)
{
printf (_("\n\n\nflat profile:\n"));
flat_blurb (stdout);
}
}
else
{
printf (_("Flat profile:\n"));
}
and tertiary keys). */
time_sorted_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
for (index = 0; index < symtab.len; ++index)
time_sorted_syms[index] = &symtab.base[index];
qsort (time_sorted_syms, symtab.len, sizeof (Sym *), cmp_time);
if (bsd_style_output)
{
log_scale = 5;
}
else
{
execution time and scale accordingly. */
log_scale = 0;
top_dog = 0;
top_time = 0.0;
for (index = 0; index < symtab.len; ++index)
{
sym = time_sorted_syms[index];
if (sym->ncalls != 0)
{
time = (sym->hist.time + sym->cg.child_time) / sym->ncalls;
if (time > top_time)
{
top_dog = sym;
top_time = time;
}
}
}
if (top_dog && top_dog->ncalls != 0 && top_time > 0.0)
{
top_time /= hz;
for (log_scale = 0; log_scale < ARRAY_SIZE (SItab); log_scale ++)
{
double scaled_value = SItab[log_scale].scale * top_time;
if (scaled_value >= 1.0 && scaled_value < 1000.0)
break;
}
}
}
may also want to support other (pseudo-)dimensions (such as
I-cache misses etc.). */
print_header (SItab[log_scale].prefix);
for (index = 0; index < symtab.len; ++index)
{
addr = time_sorted_syms[index]->addr;
is empty and the symbol is not in EXCL_FLAT. */
if (sym_lookup (&syms[INCL_FLAT], addr)
|| (syms[INCL_FLAT].len == 0
&& !sym_lookup (&syms[EXCL_FLAT], addr)))
print_line (time_sorted_syms[index], SItab[log_scale].scale);
}
free (time_sorted_syms);
if (print_descriptions && !bsd_style_output)
flat_blurb (stdout);
}
