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darling-gdb/gprof/basic_blocks.c

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/*
* Basic-block level related code: reading/writing of basic-block info
* to/from gmon.out; computing and formatting of basic-block related
* statistics.
*/
#include <stdio.h>
#include <unistd.h>
#include "basic_blocks.h"
#include "core.h"
#include "gmon_io.h"
#include "gmon_out.h"
#include "gprof.h"
#include "libiberty.h"
#include "source.h"
#include "sym_ids.h"
/*
* Default option values:
*/
bool bb_annotate_all_lines = FALSE;
int bb_min_calls = 1;
int bb_table_length = 10;
/*
* Variables used to compute annotated source listing stats:
*/
static long num_executable_lines;
static long num_lines_executed;
/*
* Helper for sorting. Compares two basic-blocks and returns result
* such that sorting will be increasing according to filename, line
* number, and basic-block address (in that order).
*/
static int
DEFUN (cmp_bb, (lp, rp), const void *lp AND const void *rp)
{
int r;
const Sym *left = *(const Sym **) lp;
const Sym *right = *(const Sym **) rp;
if (left->file && right->file)
{
r = strcmp (left->file->name, right->file->name);
if (r)
{
return r;
} /* if */
if (left->line_num != right->line_num)
{
return left->line_num - right->line_num;
} /* if */
} /* if */
if (left->addr < right->addr)
{
return -1;
}
else if (left->addr > right->addr)
{
return 1;
}
else
{
return 0;
} /* if */
} /* cmp_bb */
/*
* Helper for sorting. Order basic blocks in decreasing number of
* calls, ties are broken in increasing order of line numbers.
*/
static int
DEFUN (cmp_ncalls, (lp, rp), const void *lp AND const void *rp)
{
const Sym *left = *(const Sym **) lp;
const Sym *right = *(const Sym **) rp;
if (!left)
{
return 1;
}
else if (!right)
{
return -1;
} /* if */
if (right->ncalls != left->ncalls)
{
return right->ncalls - left->ncalls;
} /* if */
return left->line_num - right->line_num;
} /* cmp_ncalls */
/*
* Skip over variable length string.
*/
static void
DEFUN (fskip_string, (fp), FILE * fp)
{
int ch;
while ((ch = fgetc (fp)) != EOF)
{
if (ch == '\0')
{
break;
} /* if */
} /* if */
} /* fskip_string */
/*
* Read a basic-block record from file IFP. FILENAME is the name
* of file IFP and is provided for formatting error-messages only.
*/
void
DEFUN (bb_read_rec, (ifp, filename), FILE * ifp AND const char *filename)
{
int nblocks, b;
bfd_vma addr;
long ncalls;
Sym *sym;
if (fread (&nblocks, sizeof (nblocks), 1, ifp) != 1)
{
fprintf (stderr, "%s: %s: unexpected end of file\n", whoami, filename);
done (1);
} /* if */
nblocks = bfd_get_32 (core_bfd, (bfd_byte *) & nblocks);
if (gmon_file_version == 0)
{
fskip_string (ifp);
} /* if */
for (b = 0; b < nblocks; ++b)
{
if (gmon_file_version == 0)
{
int line_num;
/*
* Version 0 had lots of extra stuff that we don't
* care about anymore.
*/
if ((fread (&ncalls, sizeof (ncalls), 1, ifp) != 1)
|| (fread (&addr, sizeof (addr), 1, ifp) != 1)
|| (fskip_string (ifp), FALSE)
|| (fskip_string (ifp), FALSE)
|| (fread (&line_num, sizeof (line_num), 1, ifp) != 1))
{
perror (filename);
done (1);
} /* if */
}
else
{
if (fread (&addr, sizeof (addr), 1, ifp) != 1
|| fread (&ncalls, sizeof (ncalls), 1, ifp) != 1)
{
perror (filename);
done (1);
} /* if */
} /* if */
/*
* Basic-block execution counts are meaningful only if we're
* profiling at the line-by-line level:
*/
if (line_granularity)
{
/* convert from target to host endianness: */
addr = get_vma (core_bfd, (bfd_byte *) & addr);
sym = sym_lookup (&symtab, addr);
sym->is_bb_head = TRUE;
sym->ncalls += bfd_get_32 (core_bfd, (bfd_byte *) & ncalls);
DBG (BBDEBUG, printf ("[bb_read_rec] 0x%lx->0x%lx (%s) cnt=%d\n",
addr, sym->addr, sym->name, sym->ncalls));
}
else
{
static bool user_warned = FALSE;
if (!user_warned)
{
user_warned = TRUE;
fprintf (stderr,
"%s: warning: ignoring basic-block exec counts (use -l or --line)\n",
whoami);
} /* if */
} /* if */
} /* for */
return;
} /* bb_read_rec */
/*
* Write all basic-blocks with non-zero counts to file OFP. FILENAME
* is the name of OFP and is provided for producing error-messages
* only.
*/
void
DEFUN (bb_write_blocks, (ofp, filename), FILE * ofp AND const char *filename)
{
const unsigned char tag = GMON_TAG_BB_COUNT;
int nblocks = 0;
bfd_vma addr;
long ncalls;
Sym *sym;
/* count how many non-zero blocks with have: */
for (sym = symtab.base; sym < symtab.limit; ++sym)
{
if (sym->ncalls > 0)
{
++nblocks;
} /* if */
} /* for */
/* write header: */
bfd_put_32 (core_bfd, nblocks, (bfd_byte *) & nblocks);
if (fwrite (&tag, sizeof (tag), 1, ofp) != 1
|| fwrite (&nblocks, sizeof (nblocks), 1, ofp) != 1)
{
perror (filename);
done (1);
} /* if */
/* write counts: */
for (sym = symtab.base; sym < symtab.limit; ++sym)
{
if (sym->ncalls == 0)
{
continue;
} /* if */
put_vma (core_bfd, sym->addr, (bfd_byte *) & addr);
bfd_put_32 (core_bfd, sym->ncalls, (bfd_byte *) & ncalls);
if (fwrite (&addr, sizeof (addr), 1, ofp) != 1
|| fwrite (&ncalls, sizeof (ncalls), 1, ofp) != 1)
{
perror (filename);
done (1);
} /* if */
} /* for */
} /* bb_write_blocks */
/*
* Output basic-block statistics in a format that is easily parseable.
* Current the format is:
*
* <filename>:<line-number>: (<function-name>:<bb-addr): <ncalls>
*/
void
DEFUN_VOID (print_exec_counts)
{
Sym **sorted_bbs, *sym;
int i, len;
if (first_output)
{
first_output = FALSE;
}
else
{
printf ("\f\n");
} /* if */
/* sort basic-blocks according to function name and line number: */
sorted_bbs = (Sym **) xmalloc (symtab.len * sizeof (sorted_bbs[0]));
len = 0;
for (sym = symtab.base; sym < symtab.limit; ++sym)
{
/*
* Accept symbol if it's the start of a basic-block and it is
* called at least bb_min_calls times and if it's in the
* INCL_EXEC table or there is no INCL_EXEC table and it does
* not appear in the EXCL_EXEC table.
*/
if (sym->is_bb_head && sym->ncalls >= bb_min_calls
&& (sym_lookup (&syms[INCL_EXEC], sym->addr)
|| (syms[INCL_EXEC].len == 0
&& !sym_lookup (&syms[EXCL_EXEC], sym->addr))))
{
sorted_bbs[len++] = sym;
} /* if */
} /* for */
qsort (sorted_bbs, len, sizeof (sorted_bbs[0]), cmp_bb);
/* output basic-blocks: */
for (i = 0; i < len; ++i)
{
sym = sorted_bbs[i];
printf ("%s:%d: (%s:0x%lx) %d executions\n",
sym->file ? sym->file->name : "<unknown>", sym->line_num,
sym->name, sym->addr, sym->ncalls);
} /* for */
free (sorted_bbs);
} /* print_exec_counts */
/*
* Helper for bb_annotated_source: format annotation containing
* number of line executions.
*/
static void
DEFUN (annotate_with_count, (buf, width, line_num, arg),
char *buf AND int width AND int line_num AND void *arg)
{
Source_File *sf = arg;
Sym *b;
long cnt;
static long last_count;
if (line_num == 1)
{
last_count = -1;
} /* if */
b = 0;
if (line_num <= sf->num_lines)
{
b = sf->line[line_num - 1];
} /* if */
if (!b)
{
cnt = -1;
}
else
{
++num_executable_lines;
cnt = b->ncalls;
} /* if */
if (cnt > 0)
{
++num_lines_executed;
} /* if */
if (cnt < 0 && bb_annotate_all_lines)
{
cnt = last_count;
} /* if */
if (cnt < 0)
{
strcpy (buf, "\t\t");
}
else if (cnt < bb_min_calls)
{
strcpy (buf, " ##### -> ");
}
else
{
sprintf (buf, "%12ld -> ", cnt);
} /* if */
last_count = cnt;
} /* annotate_with_count */
/*
* Annotate the files named in SOURCE_FILES with basic-block statistics
* (execution counts). After each source files, a few statistics
* regarding that source file are printed.
*/
void
DEFUN_VOID (print_annotated_source)
{
Sym *sym, *line_stats, *new_line;
Source_File *sf;
int i, table_len;
FILE *ofp;
/*
* Find maximum line number for each source file that user is
* interested in:
*/
for (sym = symtab.base; sym < symtab.limit; ++sym)
{
/*
* Accept symbol if it's file is known, its line number is
* bigger than anything we have seen for that file so far and
* if it's in the INCL_ANNO table or there is no INCL_ANNO
* table and it does not appear in the EXCL_ANNO table.
*/
if (sym->file && sym->line_num > sym->file->num_lines
&& (sym_lookup (&syms[INCL_ANNO], sym->addr)
|| (syms[INCL_ANNO].len == 0
&& !sym_lookup (&syms[EXCL_ANNO], sym->addr))))
{
sym->file->num_lines = sym->line_num;
} /* if */
} /* for */
/* allocate line descriptors: */
for (sf = first_src_file; sf; sf = sf->next)
{
if (sf->num_lines > 0)
{
sf->line = (void *) xmalloc (sf->num_lines * sizeof (sf->line[0]));
memset (sf->line, 0, sf->num_lines * sizeof (sf->line[0]));
} /* if */
} /* for */
/* count executions per line: */
for (sym = symtab.base; sym < symtab.limit; ++sym)
{
if (sym->is_bb_head && sym->file && sym->file->num_lines
&& (sym_lookup (&syms[INCL_ANNO], sym->addr)
|| (syms[INCL_ANNO].len == 0
&& !sym_lookup (&syms[EXCL_ANNO], sym->addr))))
{
sym->file->ncalls += sym->ncalls;
line_stats = sym->file->line[sym->line_num - 1];
if (!line_stats)
{
/* common case has at most one basic-block per source line: */
sym->file->line[sym->line_num - 1] = sym;
}
else if (!line_stats->addr)
{
/* sym is the 3rd .. nth basic block for this line: */
line_stats->ncalls += sym->ncalls;
}
else
{
/* sym is the second basic block for this line */
new_line = (Sym *) xmalloc (sizeof (*new_line));
*new_line = *line_stats;
new_line->addr = 0;
new_line->ncalls += sym->ncalls;
sym->file->line[sym->line_num - 1] = new_line;
} /* if */
} /* if */
} /* for */
/* plod over source files, annotating them: */
for (sf = first_src_file; sf; sf = sf->next)
{
if (!sf->num_lines || (ignore_zeros && sf->ncalls == 0))
{
continue;
} /* if */
num_executable_lines = num_lines_executed = 0;
ofp = annotate_source (sf, 16, annotate_with_count, sf);
if (!ofp)
{
continue;
} /* if */
if (bb_table_length > 0)
{
fprintf (ofp, "\n\nTop %d Lines:\n\n Line Count\n\n",
bb_table_length);
/* abuse line arrays---it's not needed anymore: */
qsort (sf->line, sf->num_lines, sizeof (sf->line[0]), cmp_ncalls);
table_len = bb_table_length;
if (table_len > sf->num_lines)
{
table_len = sf->num_lines;
} /* if */
for (i = 0; i < table_len; ++i)
{
sym = sf->line[i];
if (!sym || sym->ncalls <= 0)
{
break;
} /* if */
fprintf (ofp, "%9d %10d\n", sym->line_num, sym->ncalls);
} /* for */
} /* if */
free (sf->line);
sf->line = 0;
fprintf (ofp, "\nExecution Summary:\n\n");
fprintf (ofp, "%9ld Executable lines in this file\n",
num_executable_lines);
fprintf (ofp, "%9ld Lines executed\n", num_lines_executed);
fprintf (ofp, "%9.2f Percent of the file executed\n",
num_executable_lines
? 100.0 * num_lines_executed / (double) num_executable_lines
: 100.0);
fprintf (ofp, "\n%9d Total number of line executions\n", sf->ncalls);
fprintf (ofp, "%9.2f Average executions per line\n",
num_executable_lines
? sf->ncalls / (double) num_executable_lines
: 0.0);
if (ofp != stdout)
{
fclose (ofp);
} /* if */
} /* for */
} /* print_annotated_source */
/*** end of basic_block.c ***/
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