Initial revision

1 files changed, 448 insertions, 0 deletions

diff --git a/binutils/rddbg.c b/binutils/rddbg.c
new file mode 100644
index 0000000000..9428c37ad5
--- /dev/null
+++ b/binutils/rddbg.c
@@ -0,0 +1,448 @@
+/* rddbg.c -- Read debugging information into a generic form.
+   Copyright (C) 1995, 96, 1997, 1998 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor <ian@cygnus.com>.
+
+   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 2 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., 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
+
+/* This file reads debugging information into a generic form.  This
+   file knows how to dig the debugging information out of an object
+   file.  */
+
+#include "bfd.h"
+#include "bucomm.h"
+#include "libiberty.h"
+#include "debug.h"
+#include "budbg.h"
+
+static boolean read_section_stabs_debugging_info
+  PARAMS ((bfd *, asymbol **, long, PTR, boolean *));
+static boolean read_symbol_stabs_debugging_info
+  PARAMS ((bfd *, asymbol **, long, PTR, boolean *));
+static boolean read_ieee_debugging_info PARAMS ((bfd *, PTR, boolean *));
+static void save_stab PARAMS ((int, int, bfd_vma, const char *));
+static void stab_context PARAMS ((void));
+static void free_saved_stabs PARAMS ((void));
+
+/* Read debugging information from a BFD.  Returns a generic debugging
+   pointer.  */
+
+PTR
+read_debugging_info (abfd, syms, symcount)
+     bfd *abfd;
+     asymbol **syms;
+     long symcount;
+{
+  PTR dhandle;
+  boolean found;
+
+  dhandle = debug_init ();
+  if (dhandle == NULL)
+    return NULL;
+
+  if (! read_section_stabs_debugging_info (abfd, syms, symcount, dhandle,
+					   &found))
+    return NULL;
+
+  if (bfd_get_flavour (abfd) == bfd_target_aout_flavour)
+    {
+      if (! read_symbol_stabs_debugging_info (abfd, syms, symcount, dhandle,
+					      &found))
+	return NULL;
+    }
+
+  if (bfd_get_flavour (abfd) == bfd_target_ieee_flavour)
+    {
+      if (! read_ieee_debugging_info (abfd, dhandle, &found))
+	return NULL;
+    }
+
+  /* Try reading the COFF symbols if we didn't find any stabs in COFF
+     sections.  */
+  if (! found
+      && bfd_get_flavour (abfd) == bfd_target_coff_flavour
+      && symcount > 0)
+    {
+      if (! parse_coff (abfd, syms, symcount, dhandle))
+	return NULL;
+      found = true;
+    }
+
+  if (! found)
+    {
+      fprintf (stderr, _("%s: no recognized debugging information\n"),
+	       bfd_get_filename (abfd));
+      return NULL;
+    }
+
+  return dhandle;
+}
+
+/* Read stabs in sections debugging information from a BFD.  */
+
+static boolean
+read_section_stabs_debugging_info (abfd, syms, symcount, dhandle, pfound)
+     bfd *abfd;
+     asymbol **syms;
+     long symcount;
+     PTR dhandle;
+     boolean *pfound;
+{
+  static struct
+    {
+      const char *secname;
+      const char *strsecname;
+    } names[] = { { ".stab", ".stabstr" } };
+  unsigned int i;
+  PTR shandle;
+
+  *pfound = false;
+  shandle = NULL;
+
+  for (i = 0; i < sizeof names / sizeof names[0]; i++)
+    {
+      asection *sec, *strsec;
+
+      sec = bfd_get_section_by_name (abfd, names[i].secname);
+      strsec = bfd_get_section_by_name (abfd, names[i].strsecname);
+      if (sec != NULL && strsec != NULL)
+	{
+	  bfd_size_type stabsize, strsize;
+	  bfd_byte *stabs, *strings;
+	  bfd_byte *stab;
+	  bfd_size_type stroff, next_stroff;
+
+	  stabsize = bfd_section_size (abfd, sec);
+	  stabs = (bfd_byte *) xmalloc (stabsize);
+	  if (! bfd_get_section_contents (abfd, sec, stabs, 0, stabsize))
+	    {
+	      fprintf (stderr, "%s: %s: %s\n",
+		       bfd_get_filename (abfd), names[i].secname,
+		       bfd_errmsg (bfd_get_error ()));
+	      return false;
+	    }
+
+	  strsize = bfd_section_size (abfd, strsec);
+	  strings = (bfd_byte *) xmalloc (strsize);
+	  if (! bfd_get_section_contents (abfd, strsec, strings, 0, strsize))
+	    {
+	      fprintf (stderr, "%s: %s: %s\n",
+		       bfd_get_filename (abfd), names[i].strsecname,
+		       bfd_errmsg (bfd_get_error ()));
+	      return false;
+	    }
+
+	  if (shandle == NULL)
+	    {
+	      shandle = start_stab (dhandle, abfd, true, syms, symcount);
+	      if (shandle == NULL)
+		return false;
+	    }
+
+	  *pfound = true;
+
+	  stroff = 0;
+	  next_stroff = 0;
+	  for (stab = stabs; stab < stabs + stabsize; stab += 12)
+	    {
+	      bfd_size_type strx;
+	      int type;
+	      int other;
+	      int desc;
+	      bfd_vma value;
+
+	      /* This code presumes 32 bit values.  */
+
+	      strx = bfd_get_32 (abfd, stab);
+	      type = bfd_get_8 (abfd, stab + 4);
+	      other = bfd_get_8 (abfd, stab + 5);
+	      desc = bfd_get_16 (abfd, stab + 6);
+	      value = bfd_get_32 (abfd, stab + 8);
+
+	      if (type == 0)
+		{
+		  /* Special type 0 stabs indicate the offset to the
+                     next string table.  */
+		  stroff = next_stroff;
+		  next_stroff += value;
+		}
+	      else
+		{
+		  char *f, *s;
+
+		  f = NULL;
+		  s = (char *) strings + stroff + strx;
+		  while (s[strlen (s) - 1] == '\\'
+			 && stab + 12 < stabs + stabsize)
+		    {
+		      char *p;
+
+		      stab += 12;
+		      p = s + strlen (s) - 1;
+		      *p = '\0';
+		      s = concat (s,
+				  ((char *) strings
+				   + stroff
+				   + bfd_get_32 (abfd, stab)),
+				  (const char *) NULL);
+
+		      /* We have to restore the backslash, because, if
+                         the linker is hashing stabs strings, we may
+                         see the same string more than once.  */
+		      *p = '\\';
+
+		      if (f != NULL)
+			free (f);
+		      f = s;
+		    }
+
+		  save_stab (type, desc, value, s);
+
+		  if (! parse_stab (dhandle, shandle, type, desc, value, s))
+		    {
+		      stab_context ();
+		      free_saved_stabs ();
+		      return false;
+		    }
+
+		  /* Don't free f, since I think the stabs code
+                     expects strings to hang around.  This should be
+                     straightened out.  FIXME.  */
+		}
+	    }
+
+	  free_saved_stabs ();
+	  free (stabs);
+
+	  /* Don't free strings, since I think the stabs code expects
+             the strings to hang around.  This should be straightened
+             out.  FIXME.  */
+	}
+    }
+
+  if (shandle != NULL)
+    {
+      if (! finish_stab (dhandle, shandle))
+	return false;
+    }
+
+  return true;
+}
+
+/* Read stabs in the symbol table.  */
+
+static boolean
+read_symbol_stabs_debugging_info (abfd, syms, symcount, dhandle, pfound)
+     bfd *abfd;
+     asymbol **syms;
+     long symcount;
+     PTR dhandle;
+     boolean *pfound;
+{
+  PTR shandle;
+  asymbol **ps, **symend;
+
+  shandle = NULL;
+  symend = syms + symcount;
+  for (ps = syms; ps < symend; ps++)
+    {
+      symbol_info i;
+
+      bfd_get_symbol_info (abfd, *ps, &i);
+
+      if (i.type == '-')
+	{
+	  const char *s;
+	  char *f;
+
+	  if (shandle == NULL)
+	    {
+	      shandle = start_stab (dhandle, abfd, false, syms, symcount);
+	      if (shandle == NULL)
+		return false;
+	    }
+
+	  *pfound = true;
+
+	  s = i.name;
+	  f = NULL;
+	  while (s[strlen (s) - 1] == '\\'
+		 && ps + 1 < symend)
+	    {
+	      char *sc, *n;
+
+	      ++ps;
+	      sc = xstrdup (s);
+	      sc[strlen (sc) - 1] = '\0';
+	      n = concat (sc, bfd_asymbol_name (*ps), (const char *) NULL);
+	      free (sc);
+	      if (f != NULL)
+		free (f);
+	      f = n;
+	      s = n;
+	    }
+
+	  save_stab (i.stab_type, i.stab_desc, i.value, s);
+
+	  if (! parse_stab (dhandle, shandle, i.stab_type, i.stab_desc,
+			    i.value, s))
+	    {
+	      stab_context ();
+	      free_saved_stabs ();
+	      return false;
+	    }
+
+	  /* Don't free f, since I think the stabs code expects
+	     strings to hang around.  This should be straightened out.
+	     FIXME.  */
+	}
+    }
+
+  free_saved_stabs ();
+
+  if (shandle != NULL)
+    {
+      if (! finish_stab (dhandle, shandle))
+	return false;
+    }
+
+  return true;
+}
+
+/* Read IEEE debugging information.  */
+
+static boolean
+read_ieee_debugging_info (abfd, dhandle, pfound)
+     bfd *abfd;
+     PTR dhandle;
+     boolean *pfound;
+{
+  asection *dsec;
+  bfd_size_type size;
+  bfd_byte *contents;
+
+  /* The BFD backend puts the debugging information into a section
+     named .debug.  */
+
+  dsec = bfd_get_section_by_name (abfd, ".debug");
+  if (dsec == NULL)
+    return true;
+
+  size = bfd_section_size (abfd, dsec);
+  contents = (bfd_byte *) xmalloc (size);
+  if (! bfd_get_section_contents (abfd, dsec, contents, 0, size))
+    return false;
+
+  if (! parse_ieee (dhandle, abfd, contents, size))
+    return false;
+
+  free (contents);
+
+  *pfound = true;
+
+  return true;
+}
+
+/* Record stabs strings, so that we can give some context for errors.  */
+
+#define SAVE_STABS_COUNT (16)
+
+struct saved_stab
+{
+  int type;
+  int desc;
+  bfd_vma value;
+  char *string;
+};
+
+static struct saved_stab saved_stabs[SAVE_STABS_COUNT];
+static int saved_stabs_index;
+
+/* Save a stabs string.  */
+
+static void
+save_stab (type, desc, value, string)
+     int type;
+     int desc;
+     bfd_vma value;
+     const char *string;
+{
+  if (saved_stabs[saved_stabs_index].string != NULL)
+    free (saved_stabs[saved_stabs_index].string);
+  saved_stabs[saved_stabs_index].type = type;
+  saved_stabs[saved_stabs_index].desc = desc;
+  saved_stabs[saved_stabs_index].value = value;
+  saved_stabs[saved_stabs_index].string = xstrdup (string);
+  saved_stabs_index = (saved_stabs_index + 1) % SAVE_STABS_COUNT;
+}
+
+/* Provide context for an error.  */
+
+static void
+stab_context ()
+{
+  int i;
+
+  fprintf (stderr, _("Last stabs entries before error:\n"));
+  fprintf (stderr, "n_type n_desc n_value  string\n");
+
+  i = saved_stabs_index;
+  do
+    {
+      struct saved_stab *stabp;
+
+      stabp = saved_stabs + i;
+      if (stabp->string != NULL)
+	{
+	  const char *s;
+
+	  s = bfd_get_stab_name (stabp->type);
+	  if (s != NULL)
+	    fprintf (stderr, "%-6s", s);
+	  else if (stabp->type == 0)
+	    fprintf (stderr, "HdrSym");
+	  else
+	    fprintf (stderr, "%-6d", stabp->type);
+	  fprintf (stderr, " %-6d ", stabp->desc);
+	  fprintf_vma (stderr, stabp->value);
+	  if (stabp->type != 0)
+	    fprintf (stderr, " %s", stabp->string);
+	  fprintf (stderr, "\n");
+	}
+      i = (i + 1) % SAVE_STABS_COUNT;
+    }
+  while (i != saved_stabs_index);
+}
+
+/* Free the saved stab strings.  */
+
+static void
+free_saved_stabs ()
+{
+  int i;
+
+  for (i = 0; i < SAVE_STABS_COUNT; i++)
+    {
+      if (saved_stabs[i].string != NULL)
+	{
+	  free (saved_stabs[i].string);
+	  saved_stabs[i].string = NULL;
+	}
+    }
+
+  saved_stabs_index = 0;
+}