This commit was manufactured by cvs2svn to create branch

'carlton_dictionary-branch'.

Cherrypick from master 2002-09-20 14:58:59 UTC Fernando Nasser <fnasser@redhat.com> '        * source.c: Make global variables current_source_symtab and':
    gdb/breakpoint.c
    gdb/mi/ChangeLog
    gdb/printcmd.c
    gdb/stack.c
    gdb/tracepoint.c
    gdb/valops.c
Cherrypick from gdb_5_3-branch 2002-09-03 22:29:15 UTC nobody 'This commit was manufactured by cvs2svn to create branch 'gdb_5_3-branch'.':
    gdb/mi/mi-cmd-stack.c
    gdb/objfiles.c

1 files changed, 1011 insertions, 0 deletions

diff --git a/gdb/objfiles.c b/gdb/objfiles.c
new file mode 100644
index 0000000..9c5e49f
--- /dev/null
+++ b/gdb/objfiles.c
@@ -0,0 +1,1011 @@
+/* GDB routines for manipulating objfiles.
+
+   Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
+   2001, 2002 Free Software Foundation, Inc.
+
+   Contributed by Cygnus Support, using pieces from other GDB modules.
+
+   This file is part of GDB.
+
+   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 contains support routines for creating, manipulating, and
+   destroying objfile structures. */
+
+#include "defs.h"
+#include "bfd.h"		/* Binary File Description */
+#include "symtab.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "gdb-stabs.h"
+#include "target.h"
+#include "bcache.h"
+
+#include <sys/types.h>
+#include "gdb_stat.h"
+#include <fcntl.h>
+#include "gdb_obstack.h"
+#include "gdb_string.h"
+
+#include "breakpoint.h"
+
+/* Prototypes for local functions */
+
+#if defined(USE_MMALLOC) && defined(HAVE_MMAP)
+
+#include "mmalloc.h"
+
+static int open_existing_mapped_file (char *, long, int);
+
+static int open_mapped_file (char *filename, long mtime, int flags);
+
+static PTR map_to_file (int);
+
+#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
+
+static void add_to_objfile_sections (bfd *, sec_ptr, PTR);
+
+/* Externally visible variables that are owned by this module.
+   See declarations in objfile.h for more info. */
+
+struct objfile *object_files;	/* Linked list of all objfiles */
+struct objfile *current_objfile;	/* For symbol file being read in */
+struct objfile *symfile_objfile;	/* Main symbol table loaded from */
+struct objfile *rt_common_objfile;	/* For runtime common symbols */
+
+int mapped_symbol_files;	/* Try to use mapped symbol files */
+
+/* Locate all mappable sections of a BFD file. 
+   objfile_p_char is a char * to get it through
+   bfd_map_over_sections; we cast it back to its proper type.  */
+
+#ifndef TARGET_KEEP_SECTION
+#define TARGET_KEEP_SECTION(ASECT)	0
+#endif
+
+/* Called via bfd_map_over_sections to build up the section table that
+   the objfile references.  The objfile contains pointers to the start
+   of the table (objfile->sections) and to the first location after
+   the end of the table (objfile->sections_end). */
+
+static void
+add_to_objfile_sections (bfd *abfd, sec_ptr asect, PTR objfile_p_char)
+{
+  struct objfile *objfile = (struct objfile *) objfile_p_char;
+  struct obj_section section;
+  flagword aflag;
+
+  aflag = bfd_get_section_flags (abfd, asect);
+
+  if (!(aflag & SEC_ALLOC) && !(TARGET_KEEP_SECTION (asect)))
+    return;
+
+  if (0 == bfd_section_size (abfd, asect))
+    return;
+  section.offset = 0;
+  section.objfile = objfile;
+  section.the_bfd_section = asect;
+  section.ovly_mapped = 0;
+  section.addr = bfd_section_vma (abfd, asect);
+  section.endaddr = section.addr + bfd_section_size (abfd, asect);
+  obstack_grow (&objfile->psymbol_obstack, (char *) &section, sizeof (section));
+  objfile->sections_end = (struct obj_section *) (((unsigned long) objfile->sections_end) + 1);
+}
+
+/* Builds a section table for OBJFILE.
+   Returns 0 if OK, 1 on error (in which case bfd_error contains the
+   error).
+
+   Note that while we are building the table, which goes into the
+   psymbol obstack, we hijack the sections_end pointer to instead hold
+   a count of the number of sections.  When bfd_map_over_sections
+   returns, this count is used to compute the pointer to the end of
+   the sections table, which then overwrites the count.
+
+   Also note that the OFFSET and OVLY_MAPPED in each table entry
+   are initialized to zero.
+
+   Also note that if anything else writes to the psymbol obstack while
+   we are building the table, we're pretty much hosed. */
+
+int
+build_objfile_section_table (struct objfile *objfile)
+{
+  /* objfile->sections can be already set when reading a mapped symbol
+     file.  I believe that we do need to rebuild the section table in
+     this case (we rebuild other things derived from the bfd), but we
+     can't free the old one (it's in the psymbol_obstack).  So we just
+     waste some memory.  */
+
+  objfile->sections_end = 0;
+  bfd_map_over_sections (objfile->obfd, add_to_objfile_sections, (char *) objfile);
+  objfile->sections = (struct obj_section *)
+    obstack_finish (&objfile->psymbol_obstack);
+  objfile->sections_end = objfile->sections + (unsigned long) objfile->sections_end;
+  return (0);
+}
+
+/* Given a pointer to an initialized bfd (ABFD) and some flag bits
+   allocate a new objfile struct, fill it in as best we can, link it
+   into the list of all known objfiles, and return a pointer to the
+   new objfile struct.
+
+   The FLAGS word contains various bits (OBJF_*) that can be taken as
+   requests for specific operations, like trying to open a mapped
+   version of the objfile (OBJF_MAPPED).  Other bits like
+   OBJF_SHARED are simply copied through to the new objfile flags
+   member. */
+
+struct objfile *
+allocate_objfile (bfd *abfd, int flags)
+{
+  struct objfile *objfile = NULL;
+  struct objfile *last_one = NULL;
+
+  if (mapped_symbol_files)
+    flags |= OBJF_MAPPED;
+
+#if defined(USE_MMALLOC) && defined(HAVE_MMAP)
+  if (abfd != NULL)
+    {
+
+      /* If we can support mapped symbol files, try to open/reopen the
+         mapped file that corresponds to the file from which we wish to
+         read symbols.  If the objfile is to be mapped, we must malloc
+         the structure itself using the mmap version, and arrange that
+         all memory allocation for the objfile uses the mmap routines.
+         If we are reusing an existing mapped file, from which we get
+         our objfile pointer, we have to make sure that we update the
+         pointers to the alloc/free functions in the obstack, in case
+         these functions have moved within the current gdb.  */
+
+      int fd;
+
+      fd = open_mapped_file (bfd_get_filename (abfd), bfd_get_mtime (abfd),
+			     flags);
+      if (fd >= 0)
+	{
+	  PTR md;
+
+	  if ((md = map_to_file (fd)) == NULL)
+	    {
+	      close (fd);
+	    }
+	  else if ((objfile = (struct objfile *) mmalloc_getkey (md, 0)) != NULL)
+	    {
+	      /* Update memory corruption handler function addresses. */
+	      init_malloc (md);
+	      objfile->md = md;
+	      objfile->mmfd = fd;
+	      /* Update pointers to functions to *our* copies */
+	      obstack_chunkfun (&objfile->psymbol_cache.cache, xmmalloc);
+	      obstack_freefun (&objfile->psymbol_cache.cache, xmfree);
+	      obstack_chunkfun (&objfile->macro_cache.cache, xmmalloc);
+	      obstack_freefun (&objfile->macro_cache.cache, xmfree);
+	      obstack_chunkfun (&objfile->psymbol_obstack, xmmalloc);
+	      obstack_freefun (&objfile->psymbol_obstack, xmfree);
+	      obstack_chunkfun (&objfile->symbol_obstack, xmmalloc);
+	      obstack_freefun (&objfile->symbol_obstack, xmfree);
+	      obstack_chunkfun (&objfile->type_obstack, xmmalloc);
+	      obstack_freefun (&objfile->type_obstack, xmfree);
+	      /* If already in objfile list, unlink it. */
+	      unlink_objfile (objfile);
+	      /* Forget things specific to a particular gdb, may have changed. */
+	      objfile->sf = NULL;
+	    }
+	  else
+	    {
+
+	      /* Set up to detect internal memory corruption.  MUST be
+	         done before the first malloc.  See comments in
+	         init_malloc() and mmcheck().  */
+
+	      init_malloc (md);
+
+	      objfile = (struct objfile *)
+		xmmalloc (md, sizeof (struct objfile));
+	      memset (objfile, 0, sizeof (struct objfile));
+	      objfile->md = md;
+	      objfile->mmfd = fd;
+	      objfile->flags |= OBJF_MAPPED;
+	      mmalloc_setkey (objfile->md, 0, objfile);
+	      obstack_specify_allocation_with_arg (&objfile->psymbol_cache.cache,
+						   0, 0, xmmalloc, xmfree,
+						   objfile->md);
+	      obstack_specify_allocation_with_arg (&objfile->macro_cache.cache,
+						   0, 0, xmmalloc, xmfree,
+						   objfile->md);
+	      obstack_specify_allocation_with_arg (&objfile->psymbol_obstack,
+						   0, 0, xmmalloc, xmfree,
+						   objfile->md);
+	      obstack_specify_allocation_with_arg (&objfile->symbol_obstack,
+						   0, 0, xmmalloc, xmfree,
+						   objfile->md);
+	      obstack_specify_allocation_with_arg (&objfile->type_obstack,
+						   0, 0, xmmalloc, xmfree,
+						   objfile->md);
+	    }
+	}
+
+      if ((flags & OBJF_MAPPED) && (objfile == NULL))
+	{
+	  warning ("symbol table for '%s' will not be mapped",
+		   bfd_get_filename (abfd));
+	  flags &= ~OBJF_MAPPED;
+	}
+    }
+#else /* !defined(USE_MMALLOC) || !defined(HAVE_MMAP) */
+
+  if (flags & OBJF_MAPPED)
+    {
+      warning ("mapped symbol tables are not supported on this machine; missing or broken mmap().");
+
+      /* Turn off the global flag so we don't try to do mapped symbol tables
+         any more, which shuts up gdb unless the user specifically gives the
+         "mapped" keyword again. */
+
+      mapped_symbol_files = 0;
+      flags &= ~OBJF_MAPPED;
+    }
+
+#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
+
+  /* If we don't support mapped symbol files, didn't ask for the file to be
+     mapped, or failed to open the mapped file for some reason, then revert
+     back to an unmapped objfile. */
+
+  if (objfile == NULL)
+    {
+      objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
+      memset (objfile, 0, sizeof (struct objfile));
+      objfile->md = NULL;
+      objfile->psymbol_cache = bcache_xmalloc ();
+      objfile->macro_cache = bcache_xmalloc ();
+      obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc,
+				  xfree);
+      obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc,
+				  xfree);
+      obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc,
+				  xfree);
+      flags &= ~OBJF_MAPPED;
+    }
+
+  /* Update the per-objfile information that comes from the bfd, ensuring
+     that any data that is reference is saved in the per-objfile data
+     region. */
+
+  objfile->obfd = abfd;
+  if (objfile->name != NULL)
+    {
+      xmfree (objfile->md, objfile->name);
+    }
+  if (abfd != NULL)
+    {
+      objfile->name = mstrsave (objfile->md, bfd_get_filename (abfd));
+      objfile->mtime = bfd_get_mtime (abfd);
+
+      /* Build section table.  */
+
+      if (build_objfile_section_table (objfile))
+	{
+	  error ("Can't find the file sections in `%s': %s",
+		 objfile->name, bfd_errmsg (bfd_get_error ()));
+	}
+    }
+
+  /* Initialize the section indexes for this objfile, so that we can
+     later detect if they are used w/o being properly assigned to. */
+
+    objfile->sect_index_text = -1;
+    objfile->sect_index_data = -1;
+    objfile->sect_index_bss = -1;
+    objfile->sect_index_rodata = -1;
+
+  /* Add this file onto the tail of the linked list of other such files. */
+
+  objfile->next = NULL;
+  if (object_files == NULL)
+    object_files = objfile;
+  else
+    {
+      for (last_one = object_files;
+	   last_one->next;
+	   last_one = last_one->next);
+      last_one->next = objfile;
+    }
+
+  /* Save passed in flag bits. */
+  objfile->flags |= flags;
+
+  return (objfile);
+}
+
+/* Put OBJFILE at the front of the list.  */
+
+void
+objfile_to_front (struct objfile *objfile)
+{
+  struct objfile **objp;
+  for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
+    {
+      if (*objp == objfile)
+	{
+	  /* Unhook it from where it is.  */
+	  *objp = objfile->next;
+	  /* Put it in the front.  */
+	  objfile->next = object_files;
+	  object_files = objfile;
+	  break;
+	}
+    }
+}
+
+/* Unlink OBJFILE from the list of known objfiles, if it is found in the
+   list.
+
+   It is not a bug, or error, to call this function if OBJFILE is not known
+   to be in the current list.  This is done in the case of mapped objfiles,
+   for example, just to ensure that the mapped objfile doesn't appear twice
+   in the list.  Since the list is threaded, linking in a mapped objfile
+   twice would create a circular list.
+
+   If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
+   unlinking it, just to ensure that we have completely severed any linkages
+   between the OBJFILE and the list. */
+
+void
+unlink_objfile (struct objfile *objfile)
+{
+  struct objfile **objpp;
+
+  for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next))
+    {
+      if (*objpp == objfile)
+	{
+	  *objpp = (*objpp)->next;
+	  objfile->next = NULL;
+	  return;
+	}
+    }
+
+  internal_error (__FILE__, __LINE__,
+		  "unlink_objfile: objfile already unlinked");
+}
+
+
+/* Destroy an objfile and all the symtabs and psymtabs under it.  Note
+   that as much as possible is allocated on the symbol_obstack and
+   psymbol_obstack, so that the memory can be efficiently freed.
+
+   Things which we do NOT free because they are not in malloc'd memory
+   or not in memory specific to the objfile include:
+
+   objfile -> sf
+
+   FIXME:  If the objfile is using reusable symbol information (via mmalloc),
+   then we need to take into account the fact that more than one process
+   may be using the symbol information at the same time (when mmalloc is
+   extended to support cooperative locking).  When more than one process
+   is using the mapped symbol info, we need to be more careful about when
+   we free objects in the reusable area. */
+
+void
+free_objfile (struct objfile *objfile)
+{
+  /* First do any symbol file specific actions required when we are
+     finished with a particular symbol file.  Note that if the objfile
+     is using reusable symbol information (via mmalloc) then each of
+     these routines is responsible for doing the correct thing, either
+     freeing things which are valid only during this particular gdb
+     execution, or leaving them to be reused during the next one. */
+
+  if (objfile->sf != NULL)
+    {
+      (*objfile->sf->sym_finish) (objfile);
+    }
+
+  /* We always close the bfd. */
+
+  if (objfile->obfd != NULL)
+    {
+      char *name = bfd_get_filename (objfile->obfd);
+      if (!bfd_close (objfile->obfd))
+	warning ("cannot close \"%s\": %s",
+		 name, bfd_errmsg (bfd_get_error ()));
+      xfree (name);
+    }
+
+  /* Remove it from the chain of all objfiles. */
+
+  unlink_objfile (objfile);
+
+  /* If we are going to free the runtime common objfile, mark it
+     as unallocated.  */
+
+  if (objfile == rt_common_objfile)
+    rt_common_objfile = NULL;
+
+  /* Before the symbol table code was redone to make it easier to
+     selectively load and remove information particular to a specific
+     linkage unit, gdb used to do these things whenever the monolithic
+     symbol table was blown away.  How much still needs to be done
+     is unknown, but we play it safe for now and keep each action until
+     it is shown to be no longer needed. */
+
+  /* I *think* all our callers call clear_symtab_users.  If so, no need
+     to call this here.  */
+  clear_pc_function_cache ();
+
+  /* The last thing we do is free the objfile struct itself for the
+     non-reusable case, or detach from the mapped file for the
+     reusable case.  Note that the mmalloc_detach or the xmfree() is
+     the last thing we can do with this objfile. */
+
+#if defined(USE_MMALLOC) && defined(HAVE_MMAP)
+
+  if (objfile->flags & OBJF_MAPPED)
+    {
+      /* Remember the fd so we can close it.  We can't close it before
+         doing the detach, and after the detach the objfile is gone. */
+      int mmfd;
+
+      mmfd = objfile->mmfd;
+      mmalloc_detach (objfile->md);
+      objfile = NULL;
+      close (mmfd);
+    }
+
+#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
+
+  /* If we still have an objfile, then either we don't support reusable
+     objfiles or this one was not reusable.  So free it normally. */
+
+  if (objfile != NULL)
+    {
+      if (objfile->name != NULL)
+	{
+	  xmfree (objfile->md, objfile->name);
+	}
+      if (objfile->global_psymbols.list)
+	xmfree (objfile->md, objfile->global_psymbols.list);
+      if (objfile->static_psymbols.list)
+	xmfree (objfile->md, objfile->static_psymbols.list);
+      /* Free the obstacks for non-reusable objfiles */
+      bcache_xfree (objfile->psymbol_cache);
+      bcache_xfree (objfile->macro_cache);
+      obstack_free (&objfile->psymbol_obstack, 0);
+      obstack_free (&objfile->symbol_obstack, 0);
+      obstack_free (&objfile->type_obstack, 0);
+      xmfree (objfile->md, objfile);
+      objfile = NULL;
+    }
+}
+
+static void
+do_free_objfile_cleanup (void *obj)
+{
+  free_objfile (obj);
+}
+
+struct cleanup *
+make_cleanup_free_objfile (struct objfile *obj)
+{
+  return make_cleanup (do_free_objfile_cleanup, obj);
+}
+
+/* Free all the object files at once and clean up their users.  */
+
+void
+free_all_objfiles (void)
+{
+  struct objfile *objfile, *temp;
+
+  ALL_OBJFILES_SAFE (objfile, temp)
+  {
+    free_objfile (objfile);
+  }
+  clear_symtab_users ();
+}
+
+/* Relocate OBJFILE to NEW_OFFSETS.  There should be OBJFILE->NUM_SECTIONS
+   entries in new_offsets.  */
+void
+objfile_relocate (struct objfile *objfile, struct section_offsets *new_offsets)
+{
+  struct section_offsets *delta =
+    (struct section_offsets *) alloca (SIZEOF_SECTION_OFFSETS);
+
+  {
+    int i;
+    int something_changed = 0;
+    for (i = 0; i < objfile->num_sections; ++i)
+      {
+	delta->offsets[i] =
+	  ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
+	if (ANOFFSET (delta, i) != 0)
+	  something_changed = 1;
+      }
+    if (!something_changed)
+      return;
+  }
+
+  /* OK, get all the symtabs.  */
+  {
+    struct symtab *s;
+
+    ALL_OBJFILE_SYMTABS (objfile, s)
+    {
+      struct linetable *l;
+      struct blockvector *bv;
+      int i;
+
+      /* First the line table.  */
+      l = LINETABLE (s);
+      if (l)
+	{
+	  for (i = 0; i < l->nitems; ++i)
+	    l->item[i].pc += ANOFFSET (delta, s->block_line_section);
+	}
+
+      /* Don't relocate a shared blockvector more than once.  */
+      if (!s->primary)
+	continue;
+
+      bv = BLOCKVECTOR (s);
+      for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
+	{
+	  struct block *b;
+	  struct symbol *sym;
+	  int j;
+
+	  b = BLOCKVECTOR_BLOCK (bv, i);
+	  BLOCK_START (b) += ANOFFSET (delta, s->block_line_section);
+	  BLOCK_END (b) += ANOFFSET (delta, s->block_line_section);
+
+	  ALL_BLOCK_SYMBOLS (b, j, sym)
+	    {
+	      fixup_symbol_section (sym, objfile);
+
+	      /* The RS6000 code from which this was taken skipped
+	         any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
+	         But I'm leaving out that test, on the theory that
+	         they can't possibly pass the tests below.  */
+	      if ((SYMBOL_CLASS (sym) == LOC_LABEL
+		   || SYMBOL_CLASS (sym) == LOC_STATIC
+		   || SYMBOL_CLASS (sym) == LOC_INDIRECT)
+		  && SYMBOL_SECTION (sym) >= 0)
+		{
+		  SYMBOL_VALUE_ADDRESS (sym) +=
+		    ANOFFSET (delta, SYMBOL_SECTION (sym));
+		}
+#ifdef MIPS_EFI_SYMBOL_NAME
+	      /* Relocate Extra Function Info for ecoff.  */
+
+	      else if (SYMBOL_CLASS (sym) == LOC_CONST
+		       && SYMBOL_NAMESPACE (sym) == LABEL_NAMESPACE
+		       && strcmp (SYMBOL_NAME (sym), MIPS_EFI_SYMBOL_NAME) == 0)
+		ecoff_relocate_efi (sym, ANOFFSET (delta,
+						   s->block_line_section));
+#endif
+	    }
+	}
+    }
+  }
+
+  {
+    struct partial_symtab *p;
+
+    ALL_OBJFILE_PSYMTABS (objfile, p)
+    {
+      p->textlow += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
+      p->texthigh += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
+    }
+  }
+
+  {
+    struct partial_symbol **psym;
+
+    for (psym = objfile->global_psymbols.list;
+	 psym < objfile->global_psymbols.next;
+	 psym++)
+      {
+	fixup_psymbol_section (*psym, objfile);
+	if (SYMBOL_SECTION (*psym) >= 0)
+	  SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta,
+						    SYMBOL_SECTION (*psym));
+      }
+    for (psym = objfile->static_psymbols.list;
+	 psym < objfile->static_psymbols.next;
+	 psym++)
+      {
+	fixup_psymbol_section (*psym, objfile);
+	if (SYMBOL_SECTION (*psym) >= 0)
+	  SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta,
+						    SYMBOL_SECTION (*psym));
+      }
+  }
+
+  {
+    struct minimal_symbol *msym;
+    ALL_OBJFILE_MSYMBOLS (objfile, msym)
+      if (SYMBOL_SECTION (msym) >= 0)
+      SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym));
+  }
+  /* Relocating different sections by different amounts may cause the symbols
+     to be out of order.  */
+  msymbols_sort (objfile);
+
+  {
+    int i;
+    for (i = 0; i < objfile->num_sections; ++i)
+      (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i);
+  }
+
+  if (objfile->ei.entry_point != ~(CORE_ADDR) 0)
+    {
+      /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
+	 only as a fallback.  */
+      struct obj_section *s;
+      s = find_pc_section (objfile->ei.entry_point);
+      if (s)
+        objfile->ei.entry_point += ANOFFSET (delta, s->the_bfd_section->index);
+      else
+        objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
+    }
+
+  {
+    struct obj_section *s;
+    bfd *abfd;
+
+    abfd = objfile->obfd;
+
+    ALL_OBJFILE_OSECTIONS (objfile, s)
+      {
+      	int idx = s->the_bfd_section->index;
+	
+	s->addr += ANOFFSET (delta, idx);
+	s->endaddr += ANOFFSET (delta, idx);
+      }
+  }
+
+  if (objfile->ei.entry_func_lowpc != INVALID_ENTRY_LOWPC)
+    {
+      objfile->ei.entry_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
+      objfile->ei.entry_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
+    }
+
+  if (objfile->ei.entry_file_lowpc != INVALID_ENTRY_LOWPC)
+    {
+      objfile->ei.entry_file_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
+      objfile->ei.entry_file_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
+    }
+
+  if (objfile->ei.main_func_lowpc != INVALID_ENTRY_LOWPC)
+    {
+      objfile->ei.main_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
+      objfile->ei.main_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
+    }
+
+  /* Relocate breakpoints as necessary, after things are relocated. */
+  breakpoint_re_set ();
+}
+
+/* Many places in gdb want to test just to see if we have any partial
+   symbols available.  This function returns zero if none are currently
+   available, nonzero otherwise. */
+
+int
+have_partial_symbols (void)
+{
+  struct objfile *ofp;
+
+  ALL_OBJFILES (ofp)
+  {
+    if (ofp->psymtabs != NULL)
+      {
+	return 1;
+      }
+  }
+  return 0;
+}
+
+/* Many places in gdb want to test just to see if we have any full
+   symbols available.  This function returns zero if none are currently
+   available, nonzero otherwise. */
+
+int
+have_full_symbols (void)
+{
+  struct objfile *ofp;
+
+  ALL_OBJFILES (ofp)
+  {
+    if (ofp->symtabs != NULL)
+      {
+	return 1;
+      }
+  }
+  return 0;
+}
+
+
+/* This operations deletes all objfile entries that represent solibs that
+   weren't explicitly loaded by the user, via e.g., the add-symbol-file
+   command.
+ */
+void
+objfile_purge_solibs (void)
+{
+  struct objfile *objf;
+  struct objfile *temp;
+
+  ALL_OBJFILES_SAFE (objf, temp)
+  {
+    /* We assume that the solib package has been purged already, or will
+       be soon.
+     */
+    if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED))
+      free_objfile (objf);
+  }
+}
+
+
+/* Many places in gdb want to test just to see if we have any minimal
+   symbols available.  This function returns zero if none are currently
+   available, nonzero otherwise. */
+
+int
+have_minimal_symbols (void)
+{
+  struct objfile *ofp;
+
+  ALL_OBJFILES (ofp)
+  {
+    if (ofp->msymbols != NULL)
+      {
+	return 1;
+      }
+  }
+  return 0;
+}
+
+#if defined(USE_MMALLOC) && defined(HAVE_MMAP)
+
+/* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
+   of the corresponding symbol file in MTIME, try to open an existing file
+   with the name SYMSFILENAME and verify it is more recent than the base
+   file by checking it's timestamp against MTIME.
+
+   If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
+
+   If SYMSFILENAME does exist, but is out of date, we check to see if the
+   user has specified creation of a mapped file.  If so, we don't issue
+   any warning message because we will be creating a new mapped file anyway,
+   overwriting the old one.  If not, then we issue a warning message so that
+   the user will know why we aren't using this existing mapped symbol file.
+   In either case, we return -1.
+
+   If SYMSFILENAME does exist and is not out of date, but can't be opened for
+   some reason, then prints an appropriate system error message and returns -1.
+
+   Otherwise, returns the open file descriptor.  */
+
+static int
+open_existing_mapped_file (char *symsfilename, long mtime, int flags)
+{
+  int fd = -1;
+  struct stat sbuf;
+
+  if (stat (symsfilename, &sbuf) == 0)
+    {
+      if (sbuf.st_mtime < mtime)
+	{
+	  if (!(flags & OBJF_MAPPED))
+	    {
+	      warning ("mapped symbol file `%s' is out of date, ignored it",
+		       symsfilename);
+	    }
+	}
+      else if ((fd = open (symsfilename, O_RDWR)) < 0)
+	{
+	  if (error_pre_print)
+	    {
+	      printf_unfiltered (error_pre_print);
+	    }
+	  print_sys_errmsg (symsfilename, errno);
+	}
+    }
+  return (fd);
+}
+
+/* Look for a mapped symbol file that corresponds to FILENAME and is more
+   recent than MTIME.  If MAPPED is nonzero, the user has asked that gdb
+   use a mapped symbol file for this file, so create a new one if one does
+   not currently exist.
+
+   If found, then return an open file descriptor for the file, otherwise
+   return -1.
+
+   This routine is responsible for implementing the policy that generates
+   the name of the mapped symbol file from the name of a file containing
+   symbols that gdb would like to read.  Currently this policy is to append
+   ".syms" to the name of the file.
+
+   This routine is also responsible for implementing the policy that
+   determines where the mapped symbol file is found (the search path).
+   This policy is that when reading an existing mapped file, a file of
+   the correct name in the current directory takes precedence over a
+   file of the correct name in the same directory as the symbol file.
+   When creating a new mapped file, it is always created in the current
+   directory.  This helps to minimize the chances of a user unknowingly
+   creating big mapped files in places like /bin and /usr/local/bin, and
+   allows a local copy to override a manually installed global copy (in
+   /bin for example).  */
+
+static int
+open_mapped_file (char *filename, long mtime, int flags)
+{
+  int fd;
+  char *symsfilename;
+
+  /* First try to open an existing file in the current directory, and
+     then try the directory where the symbol file is located. */
+
+  symsfilename = concat ("./", lbasename (filename), ".syms", (char *) NULL);
+  if ((fd = open_existing_mapped_file (symsfilename, mtime, flags)) < 0)
+    {
+      xfree (symsfilename);
+      symsfilename = concat (filename, ".syms", (char *) NULL);
+      fd = open_existing_mapped_file (symsfilename, mtime, flags);
+    }
+
+  /* If we don't have an open file by now, then either the file does not
+     already exist, or the base file has changed since it was created.  In
+     either case, if the user has specified use of a mapped file, then
+     create a new mapped file, truncating any existing one.  If we can't
+     create one, print a system error message saying why we can't.
+
+     By default the file is rw for everyone, with the user's umask taking
+     care of turning off the permissions the user wants off. */
+
+  if ((fd < 0) && (flags & OBJF_MAPPED))
+    {
+      xfree (symsfilename);
+      symsfilename = concat ("./", lbasename (filename), ".syms",
+			     (char *) NULL);
+      if ((fd = open (symsfilename, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0)
+	{
+	  if (error_pre_print)
+	    {
+	      printf_unfiltered (error_pre_print);
+	    }
+	  print_sys_errmsg (symsfilename, errno);
+	}
+    }
+
+  xfree (symsfilename);
+  return (fd);
+}
+
+static PTR
+map_to_file (int fd)
+{
+  PTR md;
+  CORE_ADDR mapto;
+
+  md = mmalloc_attach (fd, (PTR) 0);
+  if (md != NULL)
+    {
+      mapto = (CORE_ADDR) mmalloc_getkey (md, 1);
+      md = mmalloc_detach (md);
+      if (md != NULL)
+	{
+	  /* FIXME: should figure out why detach failed */
+	  md = NULL;
+	}
+      else if (mapto != (CORE_ADDR) NULL)
+	{
+	  /* This mapping file needs to be remapped at "mapto" */
+	  md = mmalloc_attach (fd, (PTR) mapto);
+	}
+      else
+	{
+	  /* This is a freshly created mapping file. */
+	  mapto = (CORE_ADDR) mmalloc_findbase (20 * 1024 * 1024);
+	  if (mapto != 0)
+	    {
+	      /* To avoid reusing the freshly created mapping file, at the 
+	         address selected by mmap, we must truncate it before trying
+	         to do an attach at the address we want. */
+	      ftruncate (fd, 0);
+	      md = mmalloc_attach (fd, (PTR) mapto);
+	      if (md != NULL)
+		{
+		  mmalloc_setkey (md, 1, (PTR) mapto);
+		}
+	    }
+	}
+    }
+  return (md);
+}
+
+#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
+
+/* Returns a section whose range includes PC and SECTION, 
+   or NULL if none found.  Note the distinction between the return type, 
+   struct obj_section (which is defined in gdb), and the input type
+   struct sec (which is a bfd-defined data type).  The obj_section
+   contains a pointer to the bfd struct sec section.  */
+
+struct obj_section *
+find_pc_sect_section (CORE_ADDR pc, struct sec *section)
+{
+  struct obj_section *s;
+  struct objfile *objfile;
+
+  ALL_OBJSECTIONS (objfile, s)
+    if ((section == 0 || section == s->the_bfd_section) &&
+	s->addr <= pc && pc < s->endaddr)
+      return (s);
+
+  return (NULL);
+}
+
+/* Returns a section whose range includes PC or NULL if none found. 
+   Backward compatibility, no section.  */
+
+struct obj_section *
+find_pc_section (CORE_ADDR pc)
+{
+  return find_pc_sect_section (pc, find_pc_mapped_section (pc));
+}
+
+
+/* In SVR4, we recognize a trampoline by it's section name. 
+   That is, if the pc is in a section named ".plt" then we are in
+   a trampoline.  */
+
+int
+in_plt_section (CORE_ADDR pc, char *name)
+{
+  struct obj_section *s;
+  int retval = 0;
+
+  s = find_pc_section (pc);
+
+  retval = (s != NULL
+	    && s->the_bfd_section->name != NULL
+	    && STREQ (s->the_bfd_section->name, ".plt"));
+  return (retval);
+}
+
+/* Return nonzero if NAME is in the import list of OBJFILE.  Else
+   return zero.  */
+
+int
+is_in_import_list (char *name, struct objfile *objfile)
+{
+  register int i;
+
+  if (!objfile || !name || !*name)
+    return 0;
+
+  for (i = 0; i < objfile->import_list_size; i++)
+    if (objfile->import_list[i] && STREQ (name, objfile->import_list[i]))
+      return 1;
+  return 0;
+}
+