594 lines
15 KiB
C
594 lines
15 KiB
C
/*
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* Histogram related operations.
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*/
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#include <stdio.h>
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#include "libiberty.h"
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#include "gprof.h"
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#include "core.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 "symtab.h"
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#include "sym_ids.h"
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#include "utils.h"
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static void scale_and_align_entries PARAMS ((void));
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/* declarations of automatically generated functions to output blurbs: */
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extern void flat_blurb PARAMS ((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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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[sizeof (((struct gmon_hist_hdr *) 0)->dimen) + 1] =
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"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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/*
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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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*/
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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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{
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'T', 1e-12
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}
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, /* tera */
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{
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'G', 1e-09
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}
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, /* giga */
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{
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'M', 1e-06
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}
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, /* mega */
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{
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'K', 1e-03
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}
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, /* kilo */
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{
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' ', 1e-00
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}
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,
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{
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'm', 1e+03
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}
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, /* milli */
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{
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'u', 1e+06
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}
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, /* micro */
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{
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'n', 1e+09
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}
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, /* nano */
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{
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'p', 1e+12
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}
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, /* pico */
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{
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'f', 1e+15
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}
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, /* femto */
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{
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'a', 1e+18
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}
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, /* ato */
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};
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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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*/
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void
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DEFUN (hist_read_rec, (ifp, filename), FILE * ifp AND const char *filename)
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{
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struct gmon_hist_hdr hdr;
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bfd_vma n_lowpc, n_highpc;
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int i, ncnt, profrate;
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UNIT count;
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if (fread (&hdr, sizeof (hdr), 1, ifp) != 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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n_lowpc = (bfd_vma) get_vma (core_bfd, (bfd_byte *) hdr.low_pc);
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n_highpc = (bfd_vma) get_vma (core_bfd, (bfd_byte *) hdr.high_pc);
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ncnt = bfd_get_32 (core_bfd, (bfd_byte *) hdr.hist_size);
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profrate = bfd_get_32 (core_bfd, (bfd_byte *) hdr.prof_rate);
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strncpy (hist_dimension, hdr.dimen, sizeof (hdr.dimen));
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hist_dimension[sizeof (hdr.dimen)] = '\0';
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hist_dimension_abbrev = hdr.dimen_abbrev;
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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 %d\n",
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n_lowpc, n_highpc, ncnt);
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printf ("[hist_read_rec] s_lowpc 0x%lx s_highpc 0x%lx nsamples %d\n",
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s_lowpc, s_highpc, hist_num_bins);
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printf ("[hist_read_rec] lowpc 0x%lx highpc 0x%lx\n",
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lowpc, highpc));
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if (n_lowpc != s_lowpc || n_highpc != s_highpc
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|| ncnt != hist_num_bins || hz != 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 %d of %d 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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}
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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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*/
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void
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DEFUN (hist_write_hist, (ofp, filename), FILE * ofp AND const char *filename)
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{
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struct gmon_hist_hdr hdr;
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unsigned char tag;
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UNIT count;
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int i;
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/* write header: */
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tag = GMON_TAG_TIME_HIST;
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put_vma (core_bfd, s_lowpc, (bfd_byte *) hdr.low_pc);
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put_vma (core_bfd, s_highpc, (bfd_byte *) hdr.high_pc);
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bfd_put_32 (core_bfd, hist_num_bins, (bfd_byte *) hdr.hist_size);
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bfd_put_32 (core_bfd, hz, (bfd_byte *) hdr.prof_rate);
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strncpy (hdr.dimen, hist_dimension, sizeof (hdr.dimen));
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hdr.dimen_abbrev = hist_dimension_abbrev;
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if (fwrite (&tag, sizeof (tag), 1, ofp) != 1
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|| fwrite (&hdr, sizeof (hdr), 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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for (i = 0; i < hist_num_bins; ++i)
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{
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bfd_put_16 (core_bfd, 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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/*
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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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*/
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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) / 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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sym->hist.scaled_addr,
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sym->hist.scaled_addr + 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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/*
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* Assign samples to the symbol to which they belong.
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*
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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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*
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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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*
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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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* | | | | | |
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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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*
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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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*/
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void
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DEFUN_VOID (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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int bin_count, 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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{
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continue;
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}
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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=%d\n",
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sizeof (UNIT) * bin_low_pc, 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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/*
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* If high end of bin is below entry address, go for next
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* bin:
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*/
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if (bin_high_pc < sym_low_pc)
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{
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break;
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}
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/*
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* If low end of bin is above high end of symbol, go for
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* next symbol.
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*/
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if (bin_low_pc >= sym_high_pc)
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{
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continue;
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}
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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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symtab.base[j].addr, sizeof (UNIT) * sym_high_pc,
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symtab.base[j].name, overlap * time / hist_scale,
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overlap));
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addr = symtab.base[j].addr;
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credit = overlap * time / hist_scale;
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/*
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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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*/
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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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/*
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* Print header for flag histogram profile:
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*/
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static void
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DEFUN (print_header, (prefix), const char 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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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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DEFUN (print_line, (sym, scale), Sym * sym AND double scale)
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{
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if (ignore_zeros && sym->ncalls == 0 && sym->hist.time == 0)
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{
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return;
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}
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accum_time += sym->hist.time;
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if (bsd_style_output)
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{
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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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}
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else
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{
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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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}
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if (sym->ncalls)
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{
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printf (" %8d %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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}
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else
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{
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printf (" %8.8s %8.8s %8.8s ", "", "", "");
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}
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if (bsd_style_output)
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{
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print_name (sym);
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}
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else
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{
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print_name_only (sym);
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}
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printf ("\n");
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}
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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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*/
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static int
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DEFUN (cmp_time, (lp, rp), const PTR lp AND 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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long call_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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{
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return 1;
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}
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if (time_diff < 0.0)
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{
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return -1;
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}
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call_diff = right->ncalls - left->ncalls;
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if (call_diff > 0)
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{
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return 1;
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}
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if (call_diff < 0)
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{
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return -1;
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}
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return strcmp (left->name, right->name);
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}
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/*
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* Print the flat histogram profile.
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*/
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void
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DEFUN_VOID (hist_print)
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{
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Sym **time_sorted_syms, *top_dog, *sym;
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int index, 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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{
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first_output = FALSE;
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}
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else
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{
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printf ("\f\n");
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}
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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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/*
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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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*/
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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; /* milli-seconds is BSD-default */
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* Search for symbol with highest per-call 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)
|
|
{
|
|
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 && top_time > 0.0)
|
|
{
|
|
top_time /= hz;
|
|
while (SItab[log_scale].scale * top_time < 1000.0
|
|
&& log_scale < sizeof (SItab) / sizeof (SItab[0]) - 1)
|
|
{
|
|
++log_scale;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
}
|