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* hist.h (struct histogram)

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(histograms, num_histograms): New.
	* hist.c (find_histogram, find_histogram_for_pc)
	(read_histogram_header): New.
	(s_lowpc, s_highpc, lowpc, highpc, hist_num_bins)
	(hist_sample): Remove.
	(hist_read_rec): Use the above, and handle multiple
	histogram records with disjoint address ranges.
	(hist_write_hist): Support several histogram records.
	(scale_and_align_entries): Adjust for multiple histograms.
	(hist_assign_samples_1): New.
	(hist_assign_samples): Use the above.
	(hist_clip_symbol_address): New.
	* hist.h (hist_check_address)
	(hist_clip_symbol_address): Declare.
	* gmon_io.c (gmon_out_read, gmon_out_write): Adjust handling
	of legacy format for multiple histogram changes.
	* corefile.c (find_call): Check for core_text_space and
	clip symbol address range here.
	* vax.c	(vax_find_call): Don't check for
	core_text_space, or clip the symbol's address range here.
	Use hist_check_address to check call's target address.
	* sparc.c: Likewise.
	* tahoe.c: Likewise.
	* i386.c: Likewise.
	* mips.c: Likewise. Also use core_text_sect->vma as the base
	address for code accesses, just like other machine-specific
	routines do.
	* gprof.texi: Adjust for the new logic.
This commit is contained in:
Vladimir Prus
2007-04-10 07:57:31 +00:00
parent 8e77c9de92
commit b3296dc54c
12 changed files with 386 additions and 211 deletions
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372
gprof/hist.c
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@@ -31,6 +31,9 @@
#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))
@@ -42,11 +45,9 @@ static int cmp_time (const PTR, const PTR);
/* 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);
double hist_scale;
static char hist_dimension[16] = "seconds";
static char hist_dimension_abbrev = 's';
@@ -76,23 +77,30 @@ SItab[] =
{ '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;
unsigned int profrate;
char n_hist_dimension[15];
char n_hist_dimension_abbrev;
double n_hist_scale;
if (gmon_io_read_vma (ifp, &n_lowpc)
|| gmon_io_read_vma (ifp, &n_highpc)
|| gmon_io_read_32 (ifp, &ncnt)
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);
@@ -100,94 +108,178 @@ hist_read_rec (FILE * ifp, const char *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;
}
else
{
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);
}
}
}
/* 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)
{
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 = 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) 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)
(unsigned long) record->lowpc, (unsigned long) record->highpc,
record->num_bins));
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]);
if (fwrite (&count[0], sizeof (count), 1, ofp) != 1)
/* Write header. */
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
@@ -205,17 +297,23 @@ scale_and_align_entries ()
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)
histogram *r = find_histogram_for_pc (sym->addr);
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;
}
}
}
}
@@ -258,8 +356,8 @@ scale_and_align_entries ()
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;
@@ -268,15 +366,12 @@ hist_assign_samples ()
unsigned int i, j;
double 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, j = 1; i < r->num_bins; ++i)
{
bin_count = hist_sample[i];
bin_count = r->sample[i];
if (! bin_count)
continue;
@@ -344,6 +439,18 @@ hist_assign_samples ()
total_time));
}
/* Calls 'hist_assign_sampes_1' for all histogram records read so far. */
void
hist_assign_samples ()
{
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. */
@@ -552,3 +659,90 @@ hist_print ()
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;
}