diff options
Diffstat (limited to 'gprof/hist.c')
| -rw-r--r-- | gprof/hist.c | 370 |
1 files changed, 282 insertions, 88 deletions
diff --git a/gprof/hist.c b/gprof/hist.c index 024f665..465655e 100644 --- a/gprof/hist.c +++ b/gprof/hist.c @@ -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; - - 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); @@ -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; } - - 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 = 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])); } - for (i = 0; i < hist_num_bins; ++i) + /* 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 < 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; - - /* Write header. */ + unsigned int i, r; - 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); - } - - 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) + histogram *record = &histograms[r]; + + /* 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; +} |