554 lines
15 KiB
C
554 lines
15 KiB
C
/* hist.c - Histogram related operations.
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Copyright 1999, 2000, 2001, 2002, 2004, 2005
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Free Software Foundation, Inc.
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This file is part of GNU Binutils.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "libiberty.h"
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#include "gprof.h"
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#include "search_list.h"
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#include "source.h"
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#include "symtab.h"
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#include "corefile.h"
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#include "gmon_io.h"
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#include "gmon_out.h"
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#include "hist.h"
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#include "sym_ids.h"
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#include "utils.h"
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#define UNITS_TO_CODE (offset_to_code / sizeof(UNIT))
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static void scale_and_align_entries (void);
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static void print_header (int);
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static void print_line (Sym *, double);
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static int cmp_time (const PTR, const PTR);
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/* Declarations of automatically generated functions to output blurbs. */
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extern void flat_blurb (FILE * fp);
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bfd_vma s_lowpc; /* Lowest address in .text. */
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bfd_vma s_highpc = 0; /* Highest address in .text. */
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bfd_vma lowpc, highpc; /* Same, but expressed in UNITs. */
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unsigned int hist_num_bins = 0; /* Number of histogram samples. */
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int *hist_sample = 0; /* Histogram samples (shorts in the file!). */
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double hist_scale;
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char hist_dimension[16] = "seconds";
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char hist_dimension_abbrev = 's';
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static double accum_time; /* Accumulated time so far for print_line(). */
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static double total_time; /* Total time for all routines. */
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/* Table of SI prefixes for powers of 10 (used to automatically
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scale some of the values in the flat profile). */
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const struct
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{
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char prefix;
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double scale;
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}
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SItab[] =
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{
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{ 'T', 1e-12 }, /* tera */
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{ 'G', 1e-09 }, /* giga */
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{ 'M', 1e-06 }, /* mega */
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{ 'K', 1e-03 }, /* kilo */
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{ ' ', 1e-00 },
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{ 'm', 1e+03 }, /* milli */
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{ 'u', 1e+06 }, /* micro */
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{ 'n', 1e+09 }, /* nano */
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{ 'p', 1e+12 }, /* pico */
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{ 'f', 1e+15 }, /* femto */
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{ 'a', 1e+18 } /* ato */
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};
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/* Read the histogram from file IFP. FILENAME is the name of IFP and
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is provided for formatting error messages only. */
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void
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hist_read_rec (FILE * ifp, const char *filename)
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{
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bfd_vma n_lowpc, n_highpc;
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unsigned int i, ncnt, profrate;
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UNIT count;
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if (gmon_io_read_vma (ifp, &n_lowpc)
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|| gmon_io_read_vma (ifp, &n_highpc)
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|| gmon_io_read_32 (ifp, &ncnt)
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|| gmon_io_read_32 (ifp, &profrate)
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|| gmon_io_read (ifp, hist_dimension, 15)
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|| gmon_io_read (ifp, &hist_dimension_abbrev, 1))
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{
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fprintf (stderr, _("%s: %s: unexpected end of file\n"),
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whoami, filename);
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done (1);
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}
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if (!s_highpc)
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{
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/* This is the first histogram record. */
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s_lowpc = n_lowpc;
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s_highpc = n_highpc;
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lowpc = (bfd_vma) n_lowpc / sizeof (UNIT);
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highpc = (bfd_vma) n_highpc / sizeof (UNIT);
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hist_num_bins = ncnt;
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hz = profrate;
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}
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DBG (SAMPLEDEBUG,
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printf ("[hist_read_rec] n_lowpc 0x%lx n_highpc 0x%lx ncnt %u\n",
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(unsigned long) n_lowpc, (unsigned long) n_highpc, ncnt);
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printf ("[hist_read_rec] s_lowpc 0x%lx s_highpc 0x%lx nsamples %u\n",
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(unsigned long) s_lowpc, (unsigned long) s_highpc,
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hist_num_bins);
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printf ("[hist_read_rec] lowpc 0x%lx highpc 0x%lx\n",
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(unsigned long) lowpc, (unsigned long) highpc));
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if (n_lowpc != s_lowpc || n_highpc != s_highpc
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|| ncnt != hist_num_bins || hz != (int) profrate)
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{
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fprintf (stderr, _("%s: `%s' is incompatible with first gmon file\n"),
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whoami, filename);
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done (1);
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}
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if (!hist_sample)
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{
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hist_sample = (int *) xmalloc (hist_num_bins * sizeof (hist_sample[0]));
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memset (hist_sample, 0, hist_num_bins * sizeof (hist_sample[0]));
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}
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for (i = 0; i < hist_num_bins; ++i)
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{
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if (fread (&count[0], sizeof (count), 1, ifp) != 1)
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{
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fprintf (stderr,
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_("%s: %s: unexpected EOF after reading %u of %u samples\n"),
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whoami, filename, i, hist_num_bins);
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done (1);
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}
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hist_sample[i] += bfd_get_16 (core_bfd, (bfd_byte *) & count[0]);
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DBG (SAMPLEDEBUG,
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printf ("[hist_read_rec] 0x%lx: %u\n",
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(unsigned long) (n_lowpc + i * (n_highpc - n_lowpc) / ncnt),
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hist_sample[i]));
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}
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}
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/* Write execution histogram to file OFP. FILENAME is the name
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of OFP and is provided for formatting error-messages only. */
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void
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hist_write_hist (FILE * ofp, const char *filename)
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{
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UNIT count;
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unsigned int i;
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/* Write header. */
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if (gmon_io_write_8 (ofp, GMON_TAG_TIME_HIST)
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|| gmon_io_write_vma (ofp, s_lowpc)
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|| gmon_io_write_vma (ofp, s_highpc)
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|| gmon_io_write_32 (ofp, hist_num_bins)
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|| gmon_io_write_32 (ofp, hz)
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|| gmon_io_write (ofp, hist_dimension, 15)
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|| gmon_io_write (ofp, &hist_dimension_abbrev, 1))
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{
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perror (filename);
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done (1);
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}
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for (i = 0; i < hist_num_bins; ++i)
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{
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bfd_put_16 (core_bfd, (bfd_vma) hist_sample[i], (bfd_byte *) &count[0]);
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if (fwrite (&count[0], sizeof (count), 1, ofp) != 1)
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{
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perror (filename);
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done (1);
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}
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}
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}
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/* Calculate scaled entry point addresses (to save time in
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hist_assign_samples), and, on architectures that have procedure
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entry masks at the start of a function, possibly push the scaled
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entry points over the procedure entry mask, if it turns out that
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the entry point is in one bin and the code for a routine is in the
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next bin. */
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static void
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scale_and_align_entries ()
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{
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Sym *sym;
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bfd_vma bin_of_entry;
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bfd_vma bin_of_code;
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for (sym = symtab.base; sym < symtab.limit; sym++)
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{
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sym->hist.scaled_addr = sym->addr / sizeof (UNIT);
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bin_of_entry = (sym->hist.scaled_addr - lowpc) / hist_scale;
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bin_of_code = ((sym->hist.scaled_addr + UNITS_TO_CODE - lowpc)
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/ hist_scale);
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if (bin_of_entry < bin_of_code)
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{
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DBG (SAMPLEDEBUG,
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printf ("[scale_and_align_entries] pushing 0x%lx to 0x%lx\n",
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(unsigned long) sym->hist.scaled_addr,
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(unsigned long) (sym->hist.scaled_addr
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+ UNITS_TO_CODE)));
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sym->hist.scaled_addr += UNITS_TO_CODE;
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}
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}
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}
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/* Assign samples to the symbol to which they belong.
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Histogram bin I covers some address range [BIN_LOWPC,BIN_HIGH_PC)
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which may overlap one more symbol address ranges. If a symbol
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overlaps with the bin's address range by O percent, then O percent
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of the bin's count is credited to that symbol.
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There are three cases as to where BIN_LOW_PC and BIN_HIGH_PC can be
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with respect to the symbol's address range [SYM_LOW_PC,
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SYM_HIGH_PC) as shown in the following diagram. OVERLAP computes
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the distance (in UNITs) between the arrows, the fraction of the
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sample that is to be credited to the symbol which starts at
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SYM_LOW_PC.
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sym_low_pc sym_high_pc
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| |
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v v
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+-----------------------------------------------+
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| ->| |<- ->| |<- ->| |<- |
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+---------+ +---------+ +---------+
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^ ^ ^ ^ ^ ^
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bin_low_pc bin_high_pc bin_low_pc bin_high_pc bin_low_pc bin_high_pc
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For the VAX we assert that samples will never fall in the first two
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bytes of any routine, since that is the entry mask, thus we call
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scale_and_align_entries() to adjust the entry points if the entry
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mask falls in one bin but the code for the routine doesn't start
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until the next bin. In conjunction with the alignment of routine
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addresses, this should allow us to have only one sample for every
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four bytes of text space and never have any overlap (the two end
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cases, above). */
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void
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hist_assign_samples ()
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{
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bfd_vma bin_low_pc, bin_high_pc;
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bfd_vma sym_low_pc, sym_high_pc;
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bfd_vma overlap, addr;
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unsigned int bin_count;
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unsigned int i, j;
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double time, credit;
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/* Read samples and assign to symbols. */
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hist_scale = highpc - lowpc;
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hist_scale /= hist_num_bins;
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scale_and_align_entries ();
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/* Iterate over all sample bins. */
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for (i = 0, j = 1; i < hist_num_bins; ++i)
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{
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bin_count = hist_sample[i];
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if (! bin_count)
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continue;
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bin_low_pc = lowpc + (bfd_vma) (hist_scale * i);
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bin_high_pc = lowpc + (bfd_vma) (hist_scale * (i + 1));
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time = bin_count;
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DBG (SAMPLEDEBUG,
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printf (
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"[assign_samples] bin_low_pc=0x%lx, bin_high_pc=0x%lx, bin_count=%u\n",
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(unsigned long) (sizeof (UNIT) * bin_low_pc),
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(unsigned long) (sizeof (UNIT) * bin_high_pc),
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bin_count));
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total_time += time;
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/* Credit all symbols that are covered by bin I. */
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for (j = j - 1; j < symtab.len; ++j)
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{
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sym_low_pc = symtab.base[j].hist.scaled_addr;
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sym_high_pc = symtab.base[j + 1].hist.scaled_addr;
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/* If high end of bin is below entry address,
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go for next bin. */
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if (bin_high_pc < sym_low_pc)
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break;
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/* If low end of bin is above high end of symbol,
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go for next symbol. */
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if (bin_low_pc >= sym_high_pc)
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continue;
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overlap =
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MIN (bin_high_pc, sym_high_pc) - MAX (bin_low_pc, sym_low_pc);
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if (overlap > 0)
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{
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DBG (SAMPLEDEBUG,
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printf (
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"[assign_samples] [0x%lx,0x%lx) %s gets %f ticks %ld overlap\n",
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(unsigned long) symtab.base[j].addr,
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(unsigned long) (sizeof (UNIT) * sym_high_pc),
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symtab.base[j].name, overlap * time / hist_scale,
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(long) overlap));
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addr = symtab.base[j].addr;
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credit = overlap * time / hist_scale;
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/* Credit symbol if it appears in INCL_FLAT or that
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table is empty and it does not appear it in
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EXCL_FLAT. */
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if (sym_lookup (&syms[INCL_FLAT], addr)
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|| (syms[INCL_FLAT].len == 0
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&& !sym_lookup (&syms[EXCL_FLAT], addr)))
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{
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symtab.base[j].hist.time += credit;
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}
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else
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{
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total_time -= credit;
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}
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}
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}
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}
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DBG (SAMPLEDEBUG, printf ("[assign_samples] total_time %f\n",
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total_time));
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}
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/* Print header for flag histogram profile. */
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static void
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print_header (int prefix)
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{
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char unit[64];
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sprintf (unit, _("%c%c/call"), prefix, hist_dimension_abbrev);
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if (bsd_style_output)
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{
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printf (_("\ngranularity: each sample hit covers %ld byte(s)"),
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(long) hist_scale * sizeof (UNIT));
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if (total_time > 0.0)
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{
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printf (_(" for %.2f%% of %.2f %s\n\n"),
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100.0 / total_time, total_time / hz, hist_dimension);
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}
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}
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else
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{
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printf (_("\nEach sample counts as %g %s.\n"), 1.0 / hz, hist_dimension);
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}
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if (total_time <= 0.0)
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{
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printf (_(" no time accumulated\n\n"));
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/* This doesn't hurt since all the numerators will be zero. */
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total_time = 1.0;
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}
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printf ("%5.5s %10.10s %8.8s %8.8s %8.8s %8.8s %-8.8s\n",
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"% ", _("cumulative"), _("self "), "", _("self "), _("total "),
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"");
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printf ("%5.5s %9.9s %8.8s %8.8s %8.8s %8.8s %-8.8s\n",
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_("time"), hist_dimension, hist_dimension, _("calls"), unit, unit,
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_("name"));
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}
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static void
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print_line (Sym *sym, double scale)
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{
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if (ignore_zeros && sym->ncalls == 0 && sym->hist.time == 0)
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return;
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accum_time += sym->hist.time;
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if (bsd_style_output)
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printf ("%5.1f %10.2f %8.2f",
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total_time > 0.0 ? 100 * sym->hist.time / total_time : 0.0,
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accum_time / hz, sym->hist.time / hz);
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else
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printf ("%6.2f %9.2f %8.2f",
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total_time > 0.0 ? 100 * sym->hist.time / total_time : 0.0,
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accum_time / hz, sym->hist.time / hz);
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if (sym->ncalls != 0)
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printf (" %8lu %8.2f %8.2f ",
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sym->ncalls, scale * sym->hist.time / hz / sym->ncalls,
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scale * (sym->hist.time + sym->cg.child_time) / hz / sym->ncalls);
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else
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printf (" %8.8s %8.8s %8.8s ", "", "", "");
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if (bsd_style_output)
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print_name (sym);
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else
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print_name_only (sym);
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printf ("\n");
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}
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/* Compare LP and RP. The primary comparison key is execution time,
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the secondary is number of invocation, and the tertiary is the
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lexicographic order of the function names. */
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static int
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cmp_time (const PTR lp, const PTR rp)
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{
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const Sym *left = *(const Sym **) lp;
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const Sym *right = *(const Sym **) rp;
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double time_diff;
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time_diff = right->hist.time - left->hist.time;
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if (time_diff > 0.0)
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return 1;
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if (time_diff < 0.0)
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return -1;
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if (right->ncalls > left->ncalls)
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return 1;
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if (right->ncalls < left->ncalls)
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return -1;
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return strcmp (left->name, right->name);
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}
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/* Print the flat histogram profile. */
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void
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hist_print ()
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{
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Sym **time_sorted_syms, *top_dog, *sym;
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unsigned int index;
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unsigned log_scale;
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double top_time, time;
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bfd_vma addr;
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if (first_output)
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first_output = FALSE;
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else
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printf ("\f\n");
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accum_time = 0.0;
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if (bsd_style_output)
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{
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if (print_descriptions)
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{
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printf (_("\n\n\nflat profile:\n"));
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flat_blurb (stdout);
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}
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}
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else
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{
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printf (_("Flat profile:\n"));
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}
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/* Sort the symbol table by time (call-count and name as secondary
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and tertiary keys). */
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time_sorted_syms = (Sym **) xmalloc (symtab.len * sizeof (Sym *));
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for (index = 0; index < symtab.len; ++index)
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time_sorted_syms[index] = &symtab.base[index];
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qsort (time_sorted_syms, symtab.len, sizeof (Sym *), cmp_time);
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if (bsd_style_output)
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{
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log_scale = 5; /* Milli-seconds is BSD-default. */
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}
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else
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{
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/* Search for symbol with highest per-call
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execution time and scale accordingly. */
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log_scale = 0;
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top_dog = 0;
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top_time = 0.0;
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for (index = 0; index < symtab.len; ++index)
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{
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sym = time_sorted_syms[index];
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||
|
||
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;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* For now, the dimension is always seconds. In the future, we
|
||
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;
|
||
|
||
/* Print symbol if its in INCL_FLAT table or that table
|
||
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);
|
||
}
|