/* hist.c - Histogram related operations.
- Copyright 1999, 2000, 2001, 2002, 2004, 2005
- Free Software Foundation, Inc.
+ Copyright (C) 1999-2020 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
+ 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,
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., 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA. */
+ Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
+ 02110-1301, USA. */
\f
-#include "libiberty.h"
#include "gprof.h"
+#include "libiberty.h"
#include "search_list.h"
#include "source.h"
#include "symtab.h"
#include "hist.h"
#include "sym_ids.h"
#include "utils.h"
+#include "math.h"
+#include "stdio.h"
+#include "stdlib.h"
#define UNITS_TO_CODE (offset_to_code / sizeof(UNIT))
/* Declarations of automatically generated functions to output blurbs. */
extern void flat_blurb (FILE * fp);
-bfd_vma s_lowpc; /* Lowest address in .text. */
-bfd_vma s_highpc = 0; /* Highest address in .text. */
-bfd_vma lowpc, highpc; /* Same, but expressed in UNITs. */
-unsigned int hist_num_bins = 0; /* Number of histogram samples. */
-int *hist_sample = 0; /* Histogram samples (shorts in the file!). */
+static histogram *find_histogram (bfd_vma lowpc, bfd_vma highpc);
+static histogram *find_histogram_for_pc (bfd_vma pc);
+
+histogram * histograms;
+unsigned num_histograms;
double hist_scale;
-char hist_dimension[16] = "seconds";
-char hist_dimension_abbrev = 's';
+static char hist_dimension[16] = "seconds";
+static char hist_dimension_abbrev = 's';
static double accum_time; /* Accumulated time so far for print_line(). */
static double total_time; /* Total time for all routines. */
{ 'a', 1e+18 } /* ato */
};
+/* Reads just the header part of histogram record into
+ *RECORD from IFP. FILENAME is the name of IFP and
+ is provided for formatting error messages only.
-/* Read the histogram from file IFP. FILENAME is the name of IFP and
- is provided for formatting error messages only. */
-
-void
-hist_read_rec (FILE * ifp, const char *filename)
+ If FIRST is non-zero, sets global variables HZ, HIST_DIMENSION,
+ HIST_DIMENSION_ABBREV, HIST_SCALE. If FIRST is zero, checks
+ that the new histogram is compatible with already-set values
+ of those variables and emits an error if that's not so. */
+static void
+read_histogram_header (histogram *record,
+ FILE *ifp, const char *filename,
+ int first)
{
- 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)
+ unsigned int profrate;
+ char n_hist_dimension[15];
+ char n_hist_dimension_abbrev;
+ double n_hist_scale;
+
+ if (gmon_io_read_vma (ifp, &record->lowpc)
+ || gmon_io_read_vma (ifp, &record->highpc)
+ || gmon_io_read_32 (ifp, &record->num_bins)
|| gmon_io_read_32 (ifp, &profrate)
- || gmon_io_read (ifp, hist_dimension, 15)
- || gmon_io_read (ifp, &hist_dimension_abbrev, 1))
+ || gmon_io_read (ifp, n_hist_dimension, 15)
+ || gmon_io_read (ifp, &n_hist_dimension_abbrev, 1))
{
fprintf (stderr, _("%s: %s: unexpected end of file\n"),
whoami, filename);
done (1);
}
- if (!s_highpc)
+ n_hist_scale = (double)((record->highpc - record->lowpc) / sizeof (UNIT))
+ / record->num_bins;
+
+ if (first)
{
- /* This is the first histogram record. */
- 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;
+ /* We don't try to veryfy profrate is the same for all histogram
+ records. If we have two histogram records for the same
+ address range and profiling samples is done as often
+ as possible as opposed on timer, then the actual profrate will
+ be slightly different. Most of the time the difference does not
+ matter and insisting that profiling rate is exactly the same
+ will only create inconvenient. */
hz = profrate;
+ memcpy (hist_dimension, n_hist_dimension, 15);
+ hist_dimension_abbrev = n_hist_dimension_abbrev;
+ hist_scale = n_hist_scale;
}
-
- 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)
+ else
{
- fprintf (stderr, _("%s: `%s' is incompatible with first gmon file\n"),
- whoami, filename);
- done (1);
+ if (strncmp (n_hist_dimension, hist_dimension, 15) != 0)
+ {
+ fprintf (stderr,
+ _("%s: dimension unit changed between histogram records\n"
+ "%s: from '%s'\n"
+ "%s: to '%s'\n"),
+ whoami, whoami, hist_dimension, whoami, n_hist_dimension);
+ done (1);
+ }
+
+ if (n_hist_dimension_abbrev != hist_dimension_abbrev)
+ {
+ fprintf (stderr,
+ _("%s: dimension abbreviation changed between histogram records\n"
+ "%s: from '%c'\n"
+ "%s: to '%c'\n"),
+ whoami, whoami, hist_dimension_abbrev, whoami, n_hist_dimension_abbrev);
+ done (1);
+ }
+
+ /* The only reason we require the same scale for histograms is that
+ there's code (notably printing code), that prints units,
+ and it would be very confusing to have one unit mean different
+ things for different functions. */
+ if (fabs (hist_scale - n_hist_scale) > 0.000001)
+ {
+ fprintf (stderr,
+ _("%s: different scales in histogram records"),
+ whoami);
+ done (1);
+ }
}
+}
- if (!hist_sample)
+/* Read the histogram from file IFP. FILENAME is the name of IFP and
+ is provided for formatting error messages only. */
+
+void
+hist_read_rec (FILE * ifp, const char *filename)
+{
+ bfd_vma lowpc, highpc;
+ histogram n_record;
+ histogram *record, *existing_record;
+ unsigned i;
+
+ /* 1. Read the header and see if there's existing record for the
+ same address range and that there are no overlapping records. */
+ read_histogram_header (&n_record, ifp, filename, num_histograms == 0);
+
+ existing_record = find_histogram (n_record.lowpc, n_record.highpc);
+ if (existing_record)
{
- hist_sample = (int *) xmalloc (hist_num_bins * sizeof (hist_sample[0]));
- memset (hist_sample, 0, hist_num_bins * sizeof (hist_sample[0]));
+ record = existing_record;
}
+ else
+ {
+ /* If this record overlaps, but does not completely match an existing
+ record, it's an error. */
+ lowpc = n_record.lowpc;
+ highpc = n_record.highpc;
+ hist_clip_symbol_address (&lowpc, &highpc);
+ if (lowpc != highpc)
+ {
+ fprintf (stderr,
+ _("%s: overlapping histogram records\n"),
+ whoami);
+ done (1);
+ }
+
+ /* This is new record. Add it to global array and allocate space for
+ the samples. */
+ histograms = (struct histogram *)
+ xrealloc (histograms, sizeof (histogram) * (num_histograms + 1));
+ memcpy (histograms + num_histograms,
+ &n_record, sizeof (histogram));
+ record = &histograms[num_histograms];
+ ++num_histograms;
+
+ record->sample = (int *) xmalloc (record->num_bins
+ * sizeof (record->sample[0]));
+ memset (record->sample, 0, record->num_bins * sizeof (record->sample[0]));
+ }
+
+ /* 2. We have either a new record (with zeroed histogram data), or an existing
+ record with some data in the histogram already. Read new data into the
+ record, adding hit counts. */
+
+ DBG (SAMPLEDEBUG,
+ printf ("[hist_read_rec] n_lowpc 0x%lx n_highpc 0x%lx ncnt %u\n",
+ (unsigned long) record->lowpc, (unsigned long) record->highpc,
+ record->num_bins));
- for (i = 0; i < hist_num_bins; ++i)
+ for (i = 0; i < record->num_bins; ++i)
{
+ UNIT count;
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);
+ whoami, filename, i, record->num_bins);
done (1);
}
- hist_sample[i] += bfd_get_16 (core_bfd, (bfd_byte *) & count[0]);
+ record->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]));
+ (unsigned long) (record->lowpc
+ + i * (record->highpc - record->lowpc)
+ / record->num_bins),
+ record->sample[i]));
}
}
-/* Write execution histogram to file OFP. FILENAME is the name
+/* Write all execution histograms file OFP. FILENAME is the name
of OFP and is provided for formatting error-messages only. */
void
hist_write_hist (FILE * ofp, const char *filename)
{
UNIT count;
- unsigned int i;
+ unsigned int i, r;
- /* Write header. */
-
- 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))
+ for (r = 0; r < num_histograms; ++r)
{
- perror (filename);
- done (1);
- }
+ histogram *record = &histograms[r];
- for (i = 0; i < hist_num_bins; ++i)
- {
- bfd_put_16 (core_bfd, (bfd_vma) hist_sample[i], (bfd_byte *) &count[0]);
+ /* Write header. */
- if (fwrite (&count[0], sizeof (count), 1, ofp) != 1)
+ if (gmon_io_write_8 (ofp, GMON_TAG_TIME_HIST)
+ || gmon_io_write_vma (ofp, record->lowpc)
+ || gmon_io_write_vma (ofp, record->highpc)
+ || gmon_io_write_32 (ofp, record->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 < record->num_bins; ++i)
+ {
+ bfd_put_16 (core_bfd, (bfd_vma) record->sample[i], (bfd_byte *) &count[0]);
+
+ if (fwrite (&count[0], sizeof (count), 1, ofp) != 1)
+ {
+ perror (filename);
+ done (1);
+ }
+ }
}
}
-
/* Calculate scaled entry point addresses (to save time in
hist_assign_samples), and, on architectures that have procedure
entry masks at the start of a function, possibly push the scaled
next bin. */
static void
-scale_and_align_entries ()
+scale_and_align_entries (void)
{
Sym *sym;
bfd_vma bin_of_entry;
for (sym = symtab.base; sym < symtab.limit; sym++)
{
+ histogram *r = find_histogram_for_pc (sym->addr);
+
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)
+
+ if (r)
{
- 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;
+ bin_of_entry = (sym->hist.scaled_addr - r->lowpc) / hist_scale;
+ bin_of_code = ((sym->hist.scaled_addr + UNITS_TO_CODE - r->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;
+ }
}
}
}
four bytes of text space and never have any overlap (the two end
cases, above). */
-void
-hist_assign_samples ()
+static void
+hist_assign_samples_1 (histogram *r)
{
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;
+ unsigned int i, j, k;
+ double count_time, credit;
- /* Read samples and assign to symbols. */
- hist_scale = highpc - lowpc;
- hist_scale /= hist_num_bins;
- scale_and_align_entries ();
+ bfd_vma lowpc = r->lowpc / sizeof (UNIT);
/* Iterate over all sample bins. */
- for (i = 0, j = 1; i < hist_num_bins; ++i)
+ for (i = 0, k = 1; i < r->num_bins; ++i)
{
- bin_count = hist_sample[i];
+ bin_count = r->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;
+ count_time = bin_count;
DBG (SAMPLEDEBUG,
printf (
(unsigned long) (sizeof (UNIT) * bin_low_pc),
(unsigned long) (sizeof (UNIT) * bin_high_pc),
bin_count));
- total_time += time;
+ total_time += count_time;
+
+ /* Credit all symbols that are covered by bin I.
- /* Credit all symbols that are covered by bin I. */
- for (j = j - 1; j < symtab.len; ++j)
+ PR gprof/13325: Make sure that K does not get decremented
+ and J will never be less than 0. */
+ for (j = k - 1; j < symtab.len; k = ++j)
{
sym_low_pc = symtab.base[j].hist.scaled_addr;
sym_high_pc = symtab.base[j + 1].hist.scaled_addr;
"[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,
+ symtab.base[j].name, overlap * count_time / hist_scale,
(long) overlap));
addr = symtab.base[j].addr;
- credit = overlap * time / hist_scale;
+ credit = overlap * count_time / hist_scale;
/* Credit symbol if it appears in INCL_FLAT or that
table is empty and it does not appear it in
total_time));
}
+/* Calls 'hist_assign_sampes_1' for all histogram records read so far. */
+void
+hist_assign_samples (void)
+{
+ unsigned i;
+
+ scale_and_align_entries ();
+
+ for (i = 0; i < num_histograms; ++i)
+ hist_assign_samples_1 (&histograms[i]);
+
+}
/* Print header for flag histogram profile. */
if (bsd_style_output)
{
printf (_("\ngranularity: each sample hit covers %ld byte(s)"),
- (long) hist_scale * sizeof (UNIT));
+ (long) hist_scale * (long) sizeof (UNIT));
if (total_time > 0.0)
{
printf (_(" for %.2f%% of %.2f %s\n\n"),
/* Print the flat histogram profile. */
void
-hist_print ()
+hist_print (void)
{
Sym **time_sorted_syms, *top_dog, *sym;
- unsigned int index;
+ unsigned int sym_index;
unsigned log_scale;
- double top_time, time;
+ double top_time;
bfd_vma addr;
if (first_output)
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];
+ for (sym_index = 0; sym_index < symtab.len; ++sym_index)
+ time_sorted_syms[sym_index] = &symtab.base[sym_index];
qsort (time_sorted_syms, symtab.len, sizeof (Sym *), cmp_time);
top_dog = 0;
top_time = 0.0;
- for (index = 0; index < symtab.len; ++index)
+ for (sym_index = 0; sym_index < symtab.len; ++sym_index)
{
- sym = time_sorted_syms[index];
+ sym = time_sorted_syms[sym_index];
if (sym->ncalls != 0)
{
- time = (sym->hist.time + sym->cg.child_time) / sym->ncalls;
+ double call_time;
- if (time > top_time)
+ call_time = (sym->hist.time + sym->cg.child_time) / sym->ncalls;
+
+ if (call_time > top_time)
{
top_dog = sym;
- top_time = time;
+ top_time = call_time;
}
}
}
{
double scaled_value = SItab[log_scale].scale * top_time;
- if (scaled_value >= 1.0 && scaled_value < 1000.0)
+ if (scaled_value >= 1.0 && scaled_value < 1000.0)
break;
}
}
I-cache misses etc.). */
print_header (SItab[log_scale].prefix);
- for (index = 0; index < symtab.len; ++index)
+ for (sym_index = 0; sym_index < symtab.len; ++sym_index)
{
- addr = time_sorted_syms[index]->addr;
+ addr = time_sorted_syms[sym_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);
+ print_line (time_sorted_syms[sym_index], SItab[log_scale].scale);
}
free (time_sorted_syms);
if (print_descriptions && !bsd_style_output)
flat_blurb (stdout);
}
+
+int
+hist_check_address (unsigned address)
+{
+ unsigned i;
+
+ for (i = 0; i < num_histograms; ++i)
+ if (histograms[i].lowpc <= address && address < histograms[i].highpc)
+ return 1;
+
+ return 0;
+}
+
+#if ! defined(min)
+#define min(a,b) (((a)<(b)) ? (a) : (b))
+#endif
+#if ! defined(max)
+#define max(a,b) (((a)>(b)) ? (a) : (b))
+#endif
+
+void
+hist_clip_symbol_address (bfd_vma *p_lowpc, bfd_vma *p_highpc)
+{
+ unsigned i;
+ int found = 0;
+
+ if (num_histograms == 0)
+ {
+ *p_highpc = *p_lowpc;
+ return;
+ }
+
+ for (i = 0; i < num_histograms; ++i)
+ {
+ bfd_vma common_low, common_high;
+ common_low = max (histograms[i].lowpc, *p_lowpc);
+ common_high = min (histograms[i].highpc, *p_highpc);
+
+ if (common_low < common_high)
+ {
+ if (found)
+ {
+ fprintf (stderr,
+ _("%s: found a symbol that covers "
+ "several histogram records"),
+ whoami);
+ done (1);
+ }
+
+ found = 1;
+ *p_lowpc = common_low;
+ *p_highpc = common_high;
+ }
+ }
+
+ if (!found)
+ *p_highpc = *p_lowpc;
+}
+
+/* Find and return exising histogram record having the same lowpc and
+ highpc as passed via the parameters. Return NULL if nothing is found.
+ The return value is valid until any new histogram is read. */
+static histogram *
+find_histogram (bfd_vma lowpc, bfd_vma highpc)
+{
+ unsigned i;
+ for (i = 0; i < num_histograms; ++i)
+ {
+ if (histograms[i].lowpc == lowpc && histograms[i].highpc == highpc)
+ return &histograms[i];
+ }
+ return 0;
+}
+
+/* Given a PC, return histogram record which address range include this PC.
+ Return NULL if there's no such record. */
+static histogram *
+find_histogram_for_pc (bfd_vma pc)
+{
+ unsigned i;
+ for (i = 0; i < num_histograms; ++i)
+ {
+ if (histograms[i].lowpc <= pc && pc < histograms[i].highpc)
+ return &histograms[i];
+ }
+ return 0;
+}
projects / deliverable / binutils-gdb.git / blobdiff