/* basic_blocks.c  -  Basic-block level related code: reading/writing   of basic-block info to/from gmon.out; computing and formatting of   basic-block related statistics.    Copyright (C) 1999-2026 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 3 of the License, or   (at your option) any later version.    This program is distributed in the hope that it will be useful,   but WITHOUT ANY WARRANTY; without even the implied warranty of   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the   GNU General Public License for more details.    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., 51 Franklin Street - Fifth Floor, Boston, MA   02110-1301, USA.  */ #include "gprof.h"#include "libiberty.h"#include "filenames.h"#include "basic_blocks.h"#include "corefile.h"#include "gmon_io.h"#include "gmon_out.h"#include "search_list.h"#include "source.h"#include "symtab.h"#include "sym_ids.h" static int cmp_bb (const void *, const void *);static int cmp_ncalls (const void *, const void *);static void fskip_string (FILE *);static void annotate_with_count (char *, unsigned int, int, void *); /* Default option values:  */bool bb_annotate_all_lines = false;unsigned long 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 symbols and returns result   such that sorting will be increasing according to filename, line   number, and address (in that order).  */ static intcmp_bb (const void *lp, const void *rp){  int r;  const Sym *left = *(const Sym **) lp;  const Sym *right = *(const Sym **) rp;   if (left->file && right->file)    {      r = filename_cmp (left->file->name, right->file->name);       if (r)	return r;       if (left->line_num != right->line_num)	return left->line_num - right->line_num;    }   if (left->addr < right->addr)    return -1;  else if (left->addr > right->addr)    return 1;  else    return 0;}  /* Helper for sorting.  Order basic blocks in decreasing number of   calls, ties are broken in increasing order of line numbers.  */static intcmp_ncalls (const void *lp, 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 (left->ncalls < right->ncalls)    return 1;  else if (left->ncalls > right->ncalls)    return -1;   return left->line_num - right->line_num;} /* Skip over variable length string.  */static voidfskip_string (FILE *fp){  int ch;   while ((ch = fgetc (fp)) != EOF)    {      if (ch == '\0')	break;    }} /* Read a basic-block record from file IFP.  FILENAME is the name   of file IFP and is provided for formatting error-messages only.  */ voidbb_read_rec (FILE *ifp, const char *filename){  unsigned int nblocks, b;  bfd_vma addr, ncalls;  Sym *sym;  Sym_Table *symtab;   if (gmon_io_read_32 (ifp, &nblocks))    {      fprintf (stderr, _("%s: %s: unexpected end of file\n"),	       whoami, filename);      done (1);    }   symtab = get_symtab ();   nblocks = bfd_get_32 (core_bfd, (bfd_byte *) & nblocks);  if (gmon_file_version == 0)    fskip_string (ifp);   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);	    }	}      else if (gmon_io_read_vma (ifp, &addr)	       || gmon_io_read_vma (ifp, &ncalls))	{	  perror (filename);	  done (1);	}       /* Basic-block execution counts are meaningful only if we're	 profiling at the line-by-line level:  */      if (line_granularity)	{	  sym = sym_lookup (symtab, addr); 	  if (sym)	    {	      int i; 	      DBG (BBDEBUG,		   printf ("[bb_read_rec] 0x%lx->0x%lx (%s:%d) cnt=%lu\n",			   (unsigned long) addr, (unsigned long) sym->addr,			   sym->name, sym->line_num, (unsigned long) ncalls)); 	      for (i = 0; i < NBBS; i++)		{		  if (! sym->bb_addr[i] || sym->bb_addr[i] == addr)		    {		      sym->bb_addr[i] = addr;		      sym->bb_calls[i] += ncalls;		      break;		    }		}	    }	}      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);	    }	}    }  return;} /* 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.  */voidbb_write_blocks (FILE *ofp, const char *filename){  unsigned int nblocks = 0;  Sym *sym;  int i;  Sym_Table *symtab = get_symtab ();   /* Count how many non-zero blocks with have:  */  for (sym = symtab->base; sym < symtab->limit; ++sym)    {      for (i = 0; i < NBBS && sym->bb_addr[i]; i++)	;      nblocks += i;    }   /* Write header:  */  if (gmon_io_write_8 (ofp, GMON_TAG_BB_COUNT)      || gmon_io_write_32 (ofp, nblocks))    {      perror (filename);      done (1);    }   /* Write counts:  */  for (sym = symtab->base; sym < symtab->limit; ++sym)    {      for (i = 0; i < NBBS && sym->bb_addr[i]; i++)	{	  if (gmon_io_write_vma (ofp, sym->bb_addr[i])	      || gmon_io_write_vma (ofp, (bfd_vma) sym->bb_calls[i]))	    {	      perror (filename);	      done (1);	    }	}    }} /* Output basic-block statistics in a format that is easily parseable.   Current the format is: 	<filename>:<line-number>: (<function-name>:<bb-addr): <ncalls>  */ voidprint_exec_counts (void){  Sym **sorted_bbs, *sym;  unsigned int i, j, len;  Sym_Table *symtab = get_symtab ();   if (first_output)    first_output = false;  else    printf ("\f\n");   /* 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 in the INCL_EXEC table	 or there is no INCL_EXEC table	 and it does not appear in the EXCL_EXEC table.  */      if (sym_lookup (&syms[INCL_EXEC], sym->addr)	  || (syms[INCL_EXEC].len == 0	      && !sym_lookup (&syms[EXCL_EXEC], sym->addr)))	{	  sorted_bbs[len++] = sym;	}    }   qsort (sorted_bbs, len, sizeof (sorted_bbs[0]), cmp_bb);   /* Output basic-blocks:  */   for (i = 0; i < len; ++i)    {      sym = sorted_bbs [i];       if (sym->ncalls > 0 || ! ignore_zeros)	{	  /* FIXME: This only works if bfd_vma is unsigned long.  */	  printf (_("%s:%d: (%s:0x%lx) %lu executions\n"),		  sym->file ? sym->file->name : _("<unknown>"), sym->line_num,		  sym->name, (unsigned long) sym->addr, sym->ncalls);	}       for (j = 0; j < NBBS && sym->bb_addr[j]; j ++)	{	  if (sym->bb_calls[j] > 0 || ! ignore_zeros)	    {	      /* FIXME: This only works if bfd_vma is unsigned long.  */	      printf (_("%s:%d: (%s:0x%lx) %lu executions\n"),		      sym->file ? sym->file->name : _("<unknown>"), sym->line_num,		      sym->name, (unsigned long) sym->bb_addr[j],		      sym->bb_calls[j]);	    }	}    }  free (sorted_bbs);} /* Helper for bb_annotated_source: format annotation containing   number of line executions.  Depends on being called on each   line of a file in sequential order.    Global variable bb_annotate_all_lines enables execution count   compression (counts are suppressed if identical to the last one)   and prints counts on all executed lines.  Otherwise, print   all basic-block execution counts exactly once on the line   that starts the basic-block.  */ static voidannotate_with_count (char *buf, unsigned int width, int line_num, void *arg){  Source_File *sf = (Source_File *) arg;  Sym *b;  unsigned int i;  static unsigned long last_count;  unsigned long last_print = (unsigned long) -1;   b = NULL;   if (line_num <= sf->num_lines)    b = (Sym *) sf->line[line_num - 1];   if (!b)    {      for (i = 0; i < width; i++)	buf[i] = ' ';      buf[width] = '\0';    }  else    {      char tmpbuf[NBBS * 30];      char *p;      unsigned long ncalls;      int ncalls_set;      unsigned int len;       ++num_executable_lines;       p = tmpbuf;      *p = '\0';       ncalls = 0;      ncalls_set = 0;       /* If this is a function entry point, label the line no matter what.	 Otherwise, we're in the middle of a function, so check to see	 if the first basic-block address is larger than the starting	 address of the line.  If so, then this line begins with a	 a portion of the previous basic-block, so print that prior	 execution count (if bb_annotate_all_lines is set).  */      if (b->is_func)	{	  p += sprintf (p, "%lu", b->ncalls);	  last_count = b->ncalls;	  last_print = last_count;	  ncalls = b->ncalls;	  ncalls_set = 1;	}      else if (bb_annotate_all_lines	       && b->bb_addr[0] && b->bb_addr[0] > b->addr)	{	  p += sprintf (p, "%lu", last_count);	  last_print = last_count;	  ncalls = last_count;	  ncalls_set = 1;	}       /* Loop through all of this line's basic-blocks.  For each one,	 update last_count, then compress sequential identical counts	 (if bb_annotate_all_lines) and print the execution count.  */       for (i = 0; i < NBBS && b->bb_addr[i]; i++)	{	  last_count = b->bb_calls[i];	  if (! ncalls_set)	    {	      ncalls = 0;	      ncalls_set = 1;	    }	  ncalls += last_count; 	  if (bb_annotate_all_lines && last_count == last_print)	    continue; 	  if (p > tmpbuf)	    *p++ = ',';	  p += sprintf (p, "%lu", last_count); 	  last_print = last_count;	}       /* We're done.  If nothing has been printed on this line,	 print the last execution count (bb_annotate_all_lines),	 which could be from either a previous line (if there were	 no BBs on this line), or from this line (if all our BB	 counts were compressed out because they were identical).  */       if (bb_annotate_all_lines && p == tmpbuf)	{	  p += sprintf (p, "%lu", last_count);	  ncalls = last_count;	  ncalls_set = 1;	}       if (! ncalls_set)	{	  unsigned int c; 	  for (c = 0; c < width; c++)	    buf[c] = ' ';	  buf[width] = '\0';	  return;	}       ++num_lines_executed;       if (ncalls < bb_min_calls)	{	  strcpy (tmpbuf, "#####");	  p = tmpbuf + 5;	}       strcpy (p, " -> ");      p += 4;       len = p - tmpbuf;      if (len >= width)	{	  strncpy (buf, tmpbuf, width);	  buf[width] = '\0';	}      else	{	  unsigned int c; 	  strcpy (buf + width - len, tmpbuf);	  for (c = 0; c < width - len; ++c)	    buf[c] = ' ';	}    }} /* 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.  */ voidprint_annotated_source (void){  Sym *sym, *line_stats, *new_line;  Source_File *sf;  int i, table_len;  FILE *ofp;  Sym_Table *symtab = get_symtab ();   /* 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;	}    }   /* 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]));	}    }   /* Count executions per line:  */  for (sym = symtab->base; sym < symtab->limit; ++sym)    {

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