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/* corefile.c

   Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008

   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 "search_list.h"

#include "source.h"

#include "symtab.h"

#include "hist.h"

#include "corefile.h"

#include "safe-ctype.h"

bfd *core_bfd;

static int core_num_syms;

static asymbol **core_syms;

asection *core_text_sect;

PTR core_text_space;

static int min_insn_size;

int offset_to_code;

/* For mapping symbols to specific .o files during file ordering.  */

struct function_map *symbol_map;

unsigned int symbol_map_count;

static void read_function_mappings (const char *);

static int core_sym_class (asymbol *);

static bfd_boolean get_src_info

  (bfd_vma, const char **, const char **, int *);

extern void i386_find_call  (Sym *, bfd_vma, bfd_vma);

extern void alpha_find_call (Sym *, bfd_vma, bfd_vma);

extern void vax_find_call   (Sym *, bfd_vma, bfd_vma);

extern void tahoe_find_call (Sym *, bfd_vma, bfd_vma);

extern void sparc_find_call (Sym *, bfd_vma, bfd_vma);

extern void mips_find_call  (Sym *, bfd_vma, bfd_vma);

static void

parse_error (const char *filename)

{

  fprintf (stderr, _("%s: unable to parse mapping file %s.\n"), whoami, filename);

  done (1);

}

static void

read_function_mappings (const char *filename)

{

  FILE *file = fopen (filename, "r");

  char dummy[1024];

  int count = 0;

  if (!file)

    {

      fprintf (stderr, _("%s: could not open %s.\n"), whoami, filename);

      done (1);

    }

  /* First parse the mapping file so we know how big we need to

     make our tables.  We also do some sanity checks at this

     time.  */

  while (!feof (file))

    {

      int matches;

      matches = fscanf (file, "%[^\n:]", dummy);

      if (!matches)

        parse_error (filename);

      /* Just skip messages about files with no symbols.  */

      if (!strncmp (dummy, "No symbols in ", 14))

        {

          matches = fscanf (file, "\n");

          if (matches == EOF)

            parse_error (filename);

          continue;

        }

      /* Don't care what else is on this line at this point.  */

      matches = fscanf (file, "%[^\n]\n", dummy);

      if (!matches)

        parse_error (filename);

      count++;

    }

  /* Now we know how big we need to make our table.  */

  symbol_map = ((struct function_map *)

                xmalloc (count * sizeof (struct function_map)));

  /* Rewind the input file so we can read it again.  */

  rewind (file);

  /* Read each entry and put it into the table.  */

  count = 0;

  while (!feof (file))

    {

      int matches;

      char *tmp;

      matches = fscanf (file, "%[^\n:]", dummy);

      if (!matches)

        parse_error (filename);

      /* Just skip messages about files with no symbols.  */

      if (!strncmp (dummy, "No symbols in ", 14))

        {

          matches = fscanf (file, "\n");

          if (matches == EOF)

            parse_error (filename);

          continue;

        }

      /* dummy has the filename, go ahead and copy it.  */

      symbol_map[count].file_name = xmalloc (strlen (dummy) + 1);

      strcpy (symbol_map[count].file_name, dummy);

      /* Now we need the function name.  */

      matches = fscanf (file, "%[^\n]\n", dummy);

      if (!matches)

        parse_error (filename);

      tmp = strrchr (dummy, ' ') + 1;

      symbol_map[count].function_name = xmalloc (strlen (tmp) + 1);

      strcpy (symbol_map[count].function_name, tmp);

      count++;

    }

  /* Record the size of the map table for future reference.  */

  symbol_map_count = count;

}

void

core_init (const char *aout_name)

{

  int core_sym_bytes;

  asymbol *synthsyms;

  long synth_count;

  core_bfd = bfd_openr (aout_name, 0);

  if (!core_bfd)

    {

      perror (aout_name);

      done (1);

    }

  if (!bfd_check_format (core_bfd, bfd_object))

    {

      fprintf (stderr, _("%s: %s: not in executable format\n"), whoami, aout_name);

      done (1);

    }

  /* Get core's text section.  */

  core_text_sect = bfd_get_section_by_name (core_bfd, ".text");

  if (!core_text_sect)

    {

      core_text_sect = bfd_get_section_by_name (core_bfd, "$CODE$");

      if (!core_text_sect)

        {

          fprintf (stderr, _("%s: can't find .text section in %s\n"),

                   whoami, aout_name);

          done (1);

        }

    }

  /* Read core's symbol table.  */

  /* This will probably give us more than we need, but that's ok.  */

  core_sym_bytes = bfd_get_symtab_upper_bound (core_bfd);

  if (core_sym_bytes < 0)

    {

      fprintf (stderr, "%s: %s: %s\n", whoami, aout_name,

               bfd_errmsg (bfd_get_error ()));

      done (1);

    }

  core_syms = (asymbol **) xmalloc (core_sym_bytes);

  core_num_syms = bfd_canonicalize_symtab (core_bfd, core_syms);

  if (core_num_syms < 0)

    {

      fprintf (stderr, "%s: %s: %s\n", whoami, aout_name,

               bfd_errmsg (bfd_get_error ()));

      done (1);

    }

  synth_count = bfd_get_synthetic_symtab (core_bfd, core_num_syms, core_syms,

                                          0, NULL, &synthsyms);

  if (synth_count > 0)

    {

      asymbol **symp;

      long new_size;

      long i;

      new_size = (core_num_syms + synth_count + 1) * sizeof (*core_syms);

      core_syms = xrealloc (core_syms, new_size);

      symp = core_syms + core_num_syms;

      core_num_syms += synth_count;

      for (i = 0; i < synth_count; i++)

        *symp++ = synthsyms + i;

      *symp = 0;

    }

  min_insn_size = 1;

  offset_to_code = 0;

  switch (bfd_get_arch (core_bfd))

    {

    case bfd_arch_vax:

    case bfd_arch_tahoe:

      offset_to_code = 2;

      break;

    case bfd_arch_alpha:

      min_insn_size = 4;

      break;

    default:

      break;

    }

  if (function_mapping_file)

    read_function_mappings (function_mapping_file);

}

/* Read in the text space of an a.out file.  */

void

core_get_text_space (bfd *cbfd)

{

  core_text_space = malloc (bfd_get_section_size (core_text_sect));

  if (!core_text_space)

    {

      fprintf (stderr, _("%s: ran out room for %lu bytes of text space\n"),

               whoami, (unsigned long) bfd_get_section_size (core_text_sect));

      done (1);

    }

  if (!bfd_get_section_contents (cbfd, core_text_sect, core_text_space,

                                 0, bfd_get_section_size (core_text_sect)))

    {

      bfd_perror ("bfd_get_section_contents");

      free (core_text_space);

      core_text_space = 0;

    }

  if (!core_text_space)

    fprintf (stderr, _("%s: can't do -c\n"), whoami);

}

void

find_call (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc)

{

  if (core_text_space == 0)

    return;

  hist_clip_symbol_address (&p_lowpc, &p_highpc);

  switch (bfd_get_arch (core_bfd))

    {

    case bfd_arch_i386:

      i386_find_call (parent, p_lowpc, p_highpc);

      break;

    case bfd_arch_alpha:

      alpha_find_call (parent, p_lowpc, p_highpc);

      break;

    case bfd_arch_vax:

      vax_find_call (parent, p_lowpc, p_highpc);

      break;

    case bfd_arch_sparc:

      sparc_find_call (parent, p_lowpc, p_highpc);

      break;

    case bfd_arch_tahoe:

      tahoe_find_call (parent, p_lowpc, p_highpc);

      break;

    case bfd_arch_mips:

      mips_find_call (parent, p_lowpc, p_highpc);

      break;

    default:

      fprintf (stderr, _("%s: -c not supported on architecture %s\n"),

               whoami, bfd_printable_name(core_bfd));

      /* Don't give the error more than once.  */

      ignore_direct_calls = FALSE;

    }

}

/* Return class of symbol SYM.  The returned class can be any of:

        'T' -> symbol is a global name

        't' -> symbol is a local (static) name.  */

static int

core_sym_class (asymbol *sym)

{

  symbol_info syminfo;

  const char *name;

  char sym_prefix;

  int i;

  if (sym->section == NULL || (sym->flags & BSF_DEBUGGING) != 0)

    return 0;

  /* Must be a text symbol, and static text symbols

     don't qualify if ignore_static_funcs set.   */

  if (ignore_static_funcs && (sym->flags & BSF_LOCAL))

    {

      DBG (AOUTDEBUG, printf ("[core_sym_class] %s: not a function\n",

                              sym->name));

      return 0;

    }

  bfd_get_symbol_info (core_bfd, sym, &syminfo);

  i = syminfo.type;

  if (i == 'T')

    return i;                   /* It's a global symbol.  */

  if (i == 'W')

    /* Treat weak symbols as text symbols.  FIXME: a weak symbol may

       also be a data symbol.  */

    return 'T';

  if (i != 't')

    {

      /* Not a static text symbol.  */

      DBG (AOUTDEBUG, printf ("[core_sym_class] %s is of class %c\n",

                              sym->name, i));

      return 0;

    }

  /* Do some more filtering on static function-names.  */

  if (ignore_static_funcs)

    return 0;

  /* Can't zero-length name or funny characters in name, where

     `funny' includes: `.' (.o file names) and `$' (Pascal labels).  */

  if (!sym->name || sym->name[0] == '\0')

    return 0;

  for (name = sym->name; *name; ++name)

    {

      if (*name == '$')

        return 0;

      /* Do not discard nested subprograms (those

         which end with .NNN, where N are digits).  */

      if (*name == '.')

        for (name++; *name; name++)

          if (! ISDIGIT (*name))

            return 0;

    }

  /* On systems where the C compiler adds an underscore to all

     names, static names without underscores seem usually to be

     labels in hand written assembler in the library.  We don't want

     these names.  This is certainly necessary on a Sparc running

     SunOS 4.1 (try profiling a program that does a lot of

     division). I don't know whether it has harmful side effects on

     other systems.  Perhaps it should be made configurable.  */

  sym_prefix = bfd_get_symbol_leading_char (core_bfd);

  if ((sym_prefix && sym_prefix != sym->name[0])

      /* GCC may add special symbols to help gdb figure out the file

        language.  We want to ignore these, since sometimes they mask

        the real function.  (dj@ctron)  */

      || !strncmp (sym->name, "__gnu_compiled", 14)

      || !strncmp (sym->name, "___gnu_compiled", 15))

    {

      return 0;

    }

  /* If the object file supports marking of function symbols, then

     we can zap anything that doesn't have BSF_FUNCTION set.  */

  if (ignore_non_functions && (sym->flags & BSF_FUNCTION) == 0)

    return 0;

  return 't';                   /* It's a static text symbol.  */

}

/* Get whatever source info we can get regarding address ADDR.  */

static bfd_boolean

get_src_info (bfd_vma addr, const char **filename, const char **name, int *line_num)

{

  const char *fname = 0, *func_name = 0;

  int l = 0;

  if (bfd_find_nearest_line (core_bfd, core_text_sect, core_syms,

                             addr - core_text_sect->vma,

                             &fname, &func_name, (unsigned int *) &l)

      && fname && func_name && l)

    {

      DBG (AOUTDEBUG, printf ("[get_src_info] 0x%lx -> %s:%d (%s)\n",

                              (unsigned long) addr, fname, l, func_name));

      *filename = fname;

      *name = func_name;

      *line_num = l;

      return TRUE;

    }

  else

    {

      DBG (AOUTDEBUG, printf ("[get_src_info] no info for 0x%lx (%s:%d,%s)\n",

                              (unsigned long) addr,

                              fname ? fname : "<unknown>", l,

                              func_name ? func_name : "<unknown>"));

      return FALSE;

    }

}

/* Read in symbol table from core.

   One symbol per function is entered.  */

void

core_create_function_syms ()

{

  bfd_vma min_vma = ~(bfd_vma) 0;

  bfd_vma max_vma = 0;

  int class;

  long i, found, skip;

  unsigned int j;

  /* Pass 1 - determine upper bound on number of function names.  */

  symtab.len = 0;

  for (i = 0; i < core_num_syms; ++i)

    {

      if (!core_sym_class (core_syms[i]))

        continue;

      /* This should be replaced with a binary search or hashed

         search.  Gross.

         Don't create a symtab entry for a function that has

         a mapping to a file, unless it's the first function

         in the file.  */

      skip = 0;

      for (j = 0; j < symbol_map_count; j++)

        if (!strcmp (core_syms[i]->name, symbol_map[j].function_name))

          {

            if (j > 0 && ! strcmp (symbol_map [j].file_name,

                                   symbol_map [j - 1].file_name))

              skip = 1;

            break;

          }

      if (!skip)

        ++symtab.len;

    }

  if (symtab.len == 0)

    {

      fprintf (stderr, _("%s: file `%s' has no symbols\n"), whoami, a_out_name);

      done (1);

    }

  /* The "+ 2" is for the sentinels.  */

  symtab.base = (Sym *) xmalloc ((symtab.len + 2) * sizeof (Sym));

  /* Pass 2 - create symbols.  */

  symtab.limit = symtab.base;

  for (i = 0; i < core_num_syms; ++i)

    {

      asection *sym_sec;

      class = core_sym_class (core_syms[i]);

      if (!class)

        {

          DBG (AOUTDEBUG,

               printf ("[core_create_function_syms] rejecting: 0x%lx %s\n",

                       (unsigned long) core_syms[i]->value,

                       core_syms[i]->name));

          continue;

        }

      /* This should be replaced with a binary search or hashed

         search.  Gross.   */

      skip = 0;

      found = 0;

      for (j = 0; j < symbol_map_count; j++)

        if (!strcmp (core_syms[i]->name, symbol_map[j].function_name))

          {

            if (j > 0 && ! strcmp (symbol_map [j].file_name,

                                   symbol_map [j - 1].file_name))

              skip = 1;

            else

              found = j;

            break;

          }

      if (skip)

        continue;

      sym_init (symtab.limit);

      /* Symbol offsets are always section-relative.  */

      sym_sec = core_syms[i]->section;

      symtab.limit->addr = core_syms[i]->value;

      if (sym_sec)

        symtab.limit->addr += bfd_get_section_vma (sym_sec->owner, sym_sec);

      if (symbol_map_count

          && !strcmp (core_syms[i]->name, symbol_map[found].function_name))

        {

          symtab.limit->name = symbol_map[found].file_name;

          symtab.limit->mapped = 1;

        }

      else

        {

          symtab.limit->name = core_syms[i]->name;

          symtab.limit->mapped = 0;

        }

      /* Lookup filename and line number, if we can.  */

      {

        const char *filename, *func_name;

        if (get_src_info (symtab.limit->addr, &filename, &func_name,

                          &symtab.limit->line_num))

          {

            symtab.limit->file = source_file_lookup_path (filename);

            /* FIXME: Checking __osf__ here does not work with a cross

               gprof.  */

#ifdef __osf__

            /* Suppress symbols that are not function names.  This is

               useful to suppress code-labels and aliases.

               This is known to be useful under DEC's OSF/1.  Under SunOS 4.x,

               labels do not appear in the symbol table info, so this isn't

               necessary.  */

            if (strcmp (symtab.limit->name, func_name) != 0)

              {

                /* The symbol's address maps to a different name, so

                   it can't be a function-entry point.  This happens

                   for labels, for example.  */

                DBG (AOUTDEBUG,

                     printf ("[core_create_function_syms: rej %s (maps to %s)\n",

                             symtab.limit->name, func_name));

                continue;

              }

#endif

          }

      }

      symtab.limit->is_func = TRUE;

      symtab.limit->is_bb_head = TRUE;

      if (class == 't')

        symtab.limit->is_static = TRUE;

      /* Keep track of the minimum and maximum vma addresses used by all

         symbols.  When computing the max_vma, use the ending address of the

         section containing the symbol, if available.  */

      min_vma = MIN (symtab.limit->addr, min_vma);

      if (sym_sec)

        max_vma = MAX (bfd_get_section_vma (sym_sec->owner, sym_sec)

                       + bfd_section_size (sym_sec->owner, sym_sec) - 1,

                       max_vma);

      else

        max_vma = MAX (symtab.limit->addr, max_vma);

      DBG (AOUTDEBUG, printf ("[core_create_function_syms] %ld %s 0x%lx\n",

                              (long) (symtab.limit - symtab.base),

                              symtab.limit->name,

                              (unsigned long) symtab.limit->addr));

      ++symtab.limit;

    }

  /* Create sentinels.  */

  sym_init (symtab.limit);

  symtab.limit->name = "<locore>";

  symtab.limit->addr = 0;

  symtab.limit->end_addr = min_vma - 1;

  ++symtab.limit;

  sym_init (symtab.limit);

  symtab.limit->name = "<hicore>";

  symtab.limit->addr = max_vma + 1;

  symtab.limit->end_addr = ~(bfd_vma) 0;

  ++symtab.limit;

  symtab.len = symtab.limit - symtab.base;

  symtab_finalize (&symtab);

}

/* Read in symbol table from core.

   One symbol per line of source code is entered.  */

void

core_create_line_syms ()

{

  char *prev_name, *prev_filename;

  unsigned int prev_name_len, prev_filename_len;

  bfd_vma vma, min_vma = ~(bfd_vma) 0, max_vma = 0;

  Sym *prev, dummy, *sentinel, *sym;

  const char *filename;

  int prev_line_num;

  Sym_Table ltab;

  bfd_vma vma_high;

  /* Create symbols for functions as usual.  This is necessary in

     cases where parts of a program were not compiled with -g.  For

     those parts we still want to get info at the function level.  */

  core_create_function_syms ();

  /* Pass 1: count the number of symbols.  */

  /* To find all line information, walk through all possible

     text-space addresses (one by one!) and get the debugging

     info for each address.  When the debugging info changes,

     it is time to create a new symbol.

     Of course, this is rather slow and it would be better if

     BFD would provide an iterator for enumerating all line infos.  */

  prev_name_len = PATH_MAX;

  prev_filename_len = PATH_MAX;

  prev_name = xmalloc (prev_name_len);

  prev_filename = xmalloc (prev_filename_len);

  ltab.len = 0;

  prev_line_num = 0;

  vma_high = core_text_sect->vma + bfd_get_section_size (core_text_sect);

  for (vma = core_text_sect->vma; vma < vma_high; vma += min_insn_size)

    {

      unsigned int len;

      if (!get_src_info (vma, &filename, &dummy.name, &dummy.line_num)

          || (prev_line_num == dummy.line_num

              && prev_name != NULL

              && strcmp (prev_name, dummy.name) == 0

              && strcmp (prev_filename, filename) == 0))

        continue;

      ++ltab.len;

      prev_line_num = dummy.line_num;

      len = strlen (dummy.name);

      if (len >= prev_name_len)

        {

          prev_name_len = len + 1024;

          free (prev_name);