objfiles.c

/* GDB routines for manipulating objfiles.

   Copyright (C) 1992-2019 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 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, see <http://www.gnu.org/licenses/>.  */

/* 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 "expression.h"
#include "parser-defs.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "gdb_obstack.h"
#include "hashtab.h"

#include "breakpoint.h"
#include "block.h"
#include "dictionary.h"
#include "source.h"
#include "addrmap.h"
#include "arch-utils.h"
#include "exec.h"
#include "observable.h"
#include "complaints.h"
#include "psymtab.h"
#include "solist.h"
#include "gdb_bfd.h"
#include "btrace.h"
#include "common/pathstuff.h"

#include <vector>

/* Keep a registry of per-objfile data-pointers required by other GDB
   modules.  */

DEFINE_REGISTRY (objfile, REGISTRY_ACCESS_FIELD)

/* Externally visible variables that are owned by this module.
   See declarations in objfile.h for more info.  */

struct objfile_pspace_info
{
  struct obj_section **sections;
  int num_sections;

  /* Nonzero if object files have been added since the section map
     was last updated.  */
  int new_objfiles_available;

  /* Nonzero if the section map MUST be updated before use.  */
  int section_map_dirty;

  /* Nonzero if section map updates should be inhibited if possible.  */
  int inhibit_updates;
};

/* Per-program-space data key.  */
static const struct program_space_data *objfiles_pspace_data;

static void
objfiles_pspace_data_cleanup (struct program_space *pspace, void *arg)
{
  struct objfile_pspace_info *info = (struct objfile_pspace_info *) arg;

  xfree (info->sections);
  xfree (info);
}

/* Get the current svr4 data.  If none is found yet, add it now.  This
   function always returns a valid object.  */

static struct objfile_pspace_info *
get_objfile_pspace_data (struct program_space *pspace)
{
  struct objfile_pspace_info *info;

  info = ((struct objfile_pspace_info *)
	  program_space_data (pspace, objfiles_pspace_data));
  if (info == NULL)
    {
      info = XCNEW (struct objfile_pspace_info);
      set_program_space_data (pspace, objfiles_pspace_data, info);
    }

  return info;
}



/* Per-BFD data key.  */

static const struct bfd_data *objfiles_bfd_data;

/* Create the per-BFD storage object for OBJFILE.  If ABFD is not
   NULL, and it already has a per-BFD storage object, use that.
   Otherwise, allocate a new per-BFD storage object.  If ABFD is not
   NULL, the object is allocated on the BFD; otherwise it is allocated
   on OBJFILE's obstack.  Note that it is not safe to call this
   multiple times for a given OBJFILE -- it can only be called when
   allocating or re-initializing OBJFILE.  */

static struct objfile_per_bfd_storage *
get_objfile_bfd_data (struct objfile *objfile, struct bfd *abfd)
{
  struct objfile_per_bfd_storage *storage = NULL;

  if (abfd != NULL)
    storage = ((struct objfile_per_bfd_storage *)
	       bfd_data (abfd, objfiles_bfd_data));

  if (storage == NULL)
    {
      /* If the object requires gdb to do relocations, we simply fall
	 back to not sharing data across users.  These cases are rare
	 enough that this seems reasonable.  */
      if (abfd != NULL && !gdb_bfd_requires_relocations (abfd))
	{
	  storage
	    = ((struct objfile_per_bfd_storage *)
	       bfd_alloc (abfd, sizeof (struct objfile_per_bfd_storage)));
	  /* objfile_per_bfd_storage is not trivially constructible, must
	     call the ctor manually.  */
	  storage = new (storage) objfile_per_bfd_storage ();
	  set_bfd_data (abfd, objfiles_bfd_data, storage);
	}
      else
	storage
	  = obstack_new<objfile_per_bfd_storage> (&objfile->objfile_obstack);

      /* Look up the gdbarch associated with the BFD.  */
      if (abfd != NULL)
	storage->gdbarch = gdbarch_from_bfd (abfd);

      storage->filename_cache = bcache_xmalloc (NULL, NULL);
      storage->macro_cache = bcache_xmalloc (NULL, NULL);
      storage->language_of_main = language_unknown;
    }

  return storage;
}

/* Free STORAGE.  */

static void
free_objfile_per_bfd_storage (struct objfile_per_bfd_storage *storage)
{
  bcache_xfree (storage->filename_cache);
  bcache_xfree (storage->macro_cache);
  if (storage->demangled_names_hash)
    htab_delete (storage->demangled_names_hash);
  storage->~objfile_per_bfd_storage ();
}

/* A wrapper for free_objfile_per_bfd_storage that can be passed as a
   cleanup function to the BFD registry.  */

static void
objfile_bfd_data_free (struct bfd *unused, void *d)
{
  free_objfile_per_bfd_storage ((struct objfile_per_bfd_storage *) d);
}

/* See objfiles.h.  */

void
set_objfile_per_bfd (struct objfile *objfile)
{
  objfile->per_bfd = get_objfile_bfd_data (objfile, objfile->obfd);
}

/* Set the objfile's per-BFD notion of the "main" name and
   language.  */

void
set_objfile_main_name (struct objfile *objfile,
		       const char *name, enum language lang)
{
  if (objfile->per_bfd->name_of_main == NULL
      || strcmp (objfile->per_bfd->name_of_main, name) != 0)
    objfile->per_bfd->name_of_main
      = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack, name,
				      strlen (name));
  objfile->per_bfd->language_of_main = lang;
}

/* Helper structure to map blocks to static link properties in hash tables.  */

struct static_link_htab_entry
{
  const struct block *block;
  const struct dynamic_prop *static_link;
};

/* Return a hash code for struct static_link_htab_entry *P.  */

static hashval_t
static_link_htab_entry_hash (const void *p)
{
  const struct static_link_htab_entry *e
    = (const struct static_link_htab_entry *) p;

  return htab_hash_pointer (e->block);
}

/* Return whether P1 an P2 (pointers to struct static_link_htab_entry) are
   mappings for the same block.  */

static int
static_link_htab_entry_eq (const void *p1, const void *p2)
{
  const struct static_link_htab_entry *e1
    = (const struct static_link_htab_entry *) p1;
  const struct static_link_htab_entry *e2
    = (const struct static_link_htab_entry *) p2;

  return e1->block == e2->block;
}

/* Register STATIC_LINK as the static link for BLOCK, which is part of OBJFILE.
   Must not be called more than once for each BLOCK.  */

void
objfile_register_static_link (struct objfile *objfile,
			      const struct block *block,
			      const struct dynamic_prop *static_link)
{
  void **slot;
  struct static_link_htab_entry lookup_entry;
  struct static_link_htab_entry *entry;

  if (objfile->static_links == NULL)
    objfile->static_links = htab_create_alloc
      (1, &static_link_htab_entry_hash, static_link_htab_entry_eq, NULL,
       xcalloc, xfree);

  /* Create a slot for the mapping, make sure it's the first mapping for this
     block and then create the mapping itself.  */
  lookup_entry.block = block;
  slot = htab_find_slot (objfile->static_links, &lookup_entry, INSERT);
  gdb_assert (*slot == NULL);

  entry = XOBNEW (&objfile->objfile_obstack, static_link_htab_entry);
  entry->block = block;
  entry->static_link = static_link;
  *slot = (void *) entry;
}

/* Look for a static link for BLOCK, which is part of OBJFILE.  Return NULL if
   none was found.  */

const struct dynamic_prop *
objfile_lookup_static_link (struct objfile *objfile,
			    const struct block *block)
{
  struct static_link_htab_entry *entry;
  struct static_link_htab_entry lookup_entry;

  if (objfile->static_links == NULL)
    return NULL;
  lookup_entry.block = block;
  entry
    = (struct static_link_htab_entry *) htab_find (objfile->static_links,
						   &lookup_entry);
  if (entry == NULL)
    return NULL;

  gdb_assert (entry->block == block);
  return entry->static_link;
}



/* 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_full (struct bfd *abfd, struct bfd_section *asect,
			      struct objfile *objfile, int force)
{
  struct obj_section *section;

  if (!force)
    {
      flagword aflag;

      aflag = bfd_get_section_flags (abfd, asect);
      if (!(aflag & SEC_ALLOC))
	return;
    }

  section = &objfile->sections[gdb_bfd_section_index (abfd, asect)];
  section->objfile = objfile;
  section->the_bfd_section = asect;
  section->ovly_mapped = 0;
}

static void
add_to_objfile_sections (struct bfd *abfd, struct bfd_section *asect,
			 void *objfilep)
{
  add_to_objfile_sections_full (abfd, asect, (struct objfile *) objfilep, 0);
}

/* Builds a section table for OBJFILE.

   Note that the OFFSET and OVLY_MAPPED in each table entry are
   initialized to zero.  */

void
build_objfile_section_table (struct objfile *objfile)
{
  int count = gdb_bfd_count_sections (objfile->obfd);

  objfile->sections = OBSTACK_CALLOC (&objfile->objfile_obstack,
				      count,
				      struct obj_section);
  objfile->sections_end = (objfile->sections + count);
  bfd_map_over_sections (objfile->obfd,
			 add_to_objfile_sections, (void *) objfile);

  /* See gdb_bfd_section_index.  */
  add_to_objfile_sections_full (objfile->obfd, bfd_com_section_ptr, objfile, 1);
  add_to_objfile_sections_full (objfile->obfd, bfd_und_section_ptr, objfile, 1);
  add_to_objfile_sections_full (objfile->obfd, bfd_abs_section_ptr, objfile, 1);
  add_to_objfile_sections_full (objfile->obfd, bfd_ind_section_ptr, objfile, 1);
}

/* Given a pointer to an initialized bfd (ABFD) and some flag bits,
   initialize the new objfile as best we can and link it into the list
   of all known objfiles.

   NAME should contain original non-canonicalized filename or other
   identifier as entered by user.  If there is no better source use
   bfd_get_filename (ABFD).  NAME may be NULL only if ABFD is NULL.
   NAME content is copied into returned objfile.

   The FLAGS word contains various bits (OBJF_*) that can be taken as
   requests for specific operations.  Other bits like OBJF_SHARED are
   simply copied through to the new objfile flags member.  */

objfile::objfile (bfd *abfd, const char *name, objfile_flags flags_)
  : flags (flags_),
    pspace (current_program_space),
    partial_symtabs (new psymtab_storage ()),
    obfd (abfd)
{
  const char *expanded_name;

  /* We could use obstack_specify_allocation here instead, but
     gdb_obstack.h specifies the alloc/dealloc functions.  */
  obstack_init (&objfile_obstack);

  objfile_alloc_data (this);

  gdb::unique_xmalloc_ptr<char> name_holder;
  if (name == NULL)
    {
      gdb_assert (abfd == NULL);
      gdb_assert ((flags & OBJF_NOT_FILENAME) != 0);
      expanded_name = "<<anonymous objfile>>";
    }
  else if ((flags & OBJF_NOT_FILENAME) != 0
	   || is_target_filename (name))
    expanded_name = name;
  else
    {
      name_holder = gdb_abspath (name);
      expanded_name = name_holder.get ();
    }
  original_name
    = (char *) obstack_copy0 (&objfile_obstack,
			      expanded_name,
			      strlen (expanded_name));

  /* 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.  */

  gdb_bfd_ref (abfd);
  if (abfd != NULL)
    {
      mtime = bfd_get_mtime (abfd);

      /* Build section table.  */
      build_objfile_section_table (this);
    }

  per_bfd = get_objfile_bfd_data (this, abfd);

  terminate_minimal_symbol_table (this);

  /* Add this file onto the tail of the linked list of other such files.  */

  if (object_files == NULL)
    object_files = this;
  else
    {
      struct objfile *last_one;

      for (last_one = object_files;
	   last_one->next;
	   last_one = last_one->next);
      last_one->next = this;
    }

  /* Rebuild section map next time we need it.  */
  get_objfile_pspace_data (pspace)->new_objfiles_available = 1;
}

/* Retrieve the gdbarch associated with OBJFILE.  */

struct gdbarch *
get_objfile_arch (const struct objfile *objfile)
{
  return objfile->per_bfd->gdbarch;
}

/* If there is a valid and known entry point, function fills *ENTRY_P with it
   and returns non-zero; otherwise it returns zero.  */

int
entry_point_address_query (CORE_ADDR *entry_p)
{
  if (symfile_objfile == NULL || !symfile_objfile->per_bfd->ei.entry_point_p)
    return 0;

  *entry_p = (symfile_objfile->per_bfd->ei.entry_point
	      + ANOFFSET (symfile_objfile->section_offsets,
			  symfile_objfile->per_bfd->ei.the_bfd_section_index));

  return 1;
}

/* Get current entry point address.  Call error if it is not known.  */

CORE_ADDR
entry_point_address (void)
{
  CORE_ADDR retval;

  if (!entry_point_address_query (&retval))
    error (_("Entry point address is not known."));

  return retval;
}

/* Iterator on PARENT and every separate debug objfile of PARENT.
   The usage pattern is:
     for (objfile = parent;
          objfile;
          objfile = objfile_separate_debug_iterate (parent, objfile))
       ...
*/

struct objfile *
objfile_separate_debug_iterate (const struct objfile *parent,
                                const struct objfile *objfile)
{
  struct objfile *res;

  /* If any, return the first child.  */
  res = objfile->separate_debug_objfile;
  if (res)
    return res;

  /* Common case where there is no separate debug objfile.  */
  if (objfile == parent)
    return NULL;

  /* Return the brother if any.  Note that we don't iterate on brothers of
     the parents.  */
  res = objfile->separate_debug_objfile_link;
  if (res)
    return res;

  for (res = objfile->separate_debug_objfile_backlink;
       res != parent;
       res = res->separate_debug_objfile_backlink)
    {
      gdb_assert (res != NULL);
      if (res->separate_debug_objfile_link)
        return res->separate_debug_objfile_link;
    }
  return NULL;
}

/* Put one object file before a specified on in the global list.
   This can be used to make sure an object file is destroyed before
   another when using objfiles_safe to free all objfiles.  */
void
put_objfile_before (struct objfile *objfile, struct objfile *before_this)
{
  struct objfile **objp;

  unlink_objfile (objfile);
  
  for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
    {
      if (*objp == before_this)
	{
	  objfile->next = *objp;
	  *objp = objfile;
	  return;
	}
    }
  
  internal_error (__FILE__, __LINE__,
		  _("put_objfile_before: before objfile not in list"));
}

/* 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"));
}

/* Add OBJFILE as a separate debug objfile of PARENT.  */

void
add_separate_debug_objfile (struct objfile *objfile, struct objfile *parent)
{
  gdb_assert (objfile && parent);

  /* Must not be already in a list.  */
  gdb_assert (objfile->separate_debug_objfile_backlink == NULL);
  gdb_assert (objfile->separate_debug_objfile_link == NULL);
  gdb_assert (objfile->separate_debug_objfile == NULL);
  gdb_assert (parent->separate_debug_objfile_backlink == NULL);
  gdb_assert (parent->separate_debug_objfile_link == NULL);

  objfile->separate_debug_objfile_backlink = parent;
  objfile->separate_debug_objfile_link = parent->separate_debug_objfile;
  parent->separate_debug_objfile = objfile;

  /* Put the separate debug object before the normal one, this is so that
     usage of objfiles_safe will stay safe.  */
  put_objfile_before (objfile, parent);
}

/* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
   itself.  */

void
free_objfile_separate_debug (struct objfile *objfile)
{
  struct objfile *child;

  for (child = objfile->separate_debug_objfile; child;)
    {
      struct objfile *next_child = child->separate_debug_objfile_link;
      delete child;
      child = next_child;
    }
}

/* Destroy an objfile and all the symtabs and psymtabs under it.  */

objfile::~objfile ()
{
  /* First notify observers that this objfile is about to be freed.  */
  gdb::observers::free_objfile.notify (this);

  /* Free all separate debug objfiles.  */
  free_objfile_separate_debug (this);

  if (separate_debug_objfile_backlink)
    {
      /* We freed the separate debug file, make sure the base objfile
	 doesn't reference it.  */
      struct objfile *child;

      child = separate_debug_objfile_backlink->separate_debug_objfile;

      if (child == this)
        {
          /* THIS is the first child.  */
          separate_debug_objfile_backlink->separate_debug_objfile =
            separate_debug_objfile_link;
        }
      else
        {
          /* Find THIS in the list.  */
          while (1)
            {
              if (child->separate_debug_objfile_link == this)
                {
                  child->separate_debug_objfile_link =
                    separate_debug_objfile_link;
                  break;
                }
              child = child->separate_debug_objfile_link;
              gdb_assert (child);
            }
        }
    }

  /* Remove any references to this objfile in the global value
     lists.  */
  preserve_values (this);

  /* It still may reference data modules have associated with the objfile and
     the symbol file data.  */
  forget_cached_source_info_for_objfile (this);

  breakpoint_free_objfile (this);
  btrace_free_objfile (this);

  /* 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 (sf != NULL)
    (*sf->sym_finish) (this);

  /* Discard any data modules have associated with the objfile.  The function
     still may reference obfd.  */
  objfile_free_data (this);

  if (obfd)
    gdb_bfd_unref (obfd);
  else
    free_objfile_per_bfd_storage (per_bfd);

  /* Remove it from the chain of all objfiles.  */

  unlink_objfile (this);

  if (this == symfile_objfile)
    symfile_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.  */

  /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
     for example), so we need to call this here.  */
  clear_pc_function_cache ();

  /* Clear globals which might have pointed into a removed objfile.
     FIXME: It's not clear which of these are supposed to persist
     between expressions and which ought to be reset each time.  */
  expression_context_block = NULL;
  innermost_block.reset ();

  /* Check to see if the current_source_symtab belongs to this objfile,
     and if so, call clear_current_source_symtab_and_line.  */

  {
    struct symtab_and_line cursal = get_current_source_symtab_and_line ();

    if (cursal.symtab && SYMTAB_OBJFILE (cursal.symtab) == this)
      clear_current_source_symtab_and_line ();
  }

  /* Free the obstacks for non-reusable objfiles.  */
  obstack_free (&objfile_obstack, 0);

  /* Rebuild section map next time we need it.  */
  get_objfile_pspace_data (pspace)->section_map_dirty = 1;

  /* Free the map for static links.  There's no need to free static link
     themselves since they were allocated on the objstack.  */
  if (static_links != NULL)
    htab_delete (static_links);
}

/* Free all the object files at once and clean up their users.  */

void
free_all_objfiles (void)
{
  struct so_list *so;

  /* Any objfile referencewould become stale.  */
  for (so = master_so_list (); so; so = so->next)
    gdb_assert (so->objfile == NULL);

  for (objfile *objfile : current_program_space->objfiles_safe ())
    delete objfile;
  clear_symtab_users (0);
}

/* A helper function for objfile_relocate1 that relocates a single
   symbol.  */

static void
relocate_one_symbol (struct symbol *sym, struct objfile *objfile,
		     struct section_offsets *delta)
{
  fixup_symbol_section (sym, objfile);

  /* The RS6000 code from which this was taken skipped
     any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
     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_SECTION (sym) >= 0)
    {
      SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (delta, SYMBOL_SECTION (sym));
    }
}

/* Relocate OBJFILE to NEW_OFFSETS.  There should be OBJFILE->NUM_SECTIONS
   entries in new_offsets.  SEPARATE_DEBUG_OBJFILE is not touched here.
   Return non-zero iff any change happened.  */

static int
objfile_relocate1 (struct objfile *objfile, 
		   const struct section_offsets *new_offsets)
{
  struct section_offsets *delta =
    ((struct section_offsets *) 
     alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));

  int something_changed = 0;

  for (int 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 0;

  /* OK, get all the symtabs.  */
  {
    for (compunit_symtab *cust : objfile_compunits (objfile))
      {
	for (symtab *s : compunit_filetabs (cust))
	  {
	    struct linetable *l;

	    /* First the line table.  */
	    l = SYMTAB_LINETABLE (s);
	    if (l)
	      {
		for (int i = 0; i < l->nitems; ++i)
		  l->item[i].pc += ANOFFSET (delta,
					     COMPUNIT_BLOCK_LINE_SECTION
					     (cust));
	      }
	  }
      }

    for (compunit_symtab *cust : objfile_compunits (objfile))
      {
	const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (cust);
	int block_line_section = COMPUNIT_BLOCK_LINE_SECTION (cust);

	if (BLOCKVECTOR_MAP (bv))
	  addrmap_relocate (BLOCKVECTOR_MAP (bv),
			    ANOFFSET (delta, block_line_section));

	for (int i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
	  {
	    struct block *b;
	    struct symbol *sym;
	    struct mdict_iterator miter;

	    b = BLOCKVECTOR_BLOCK (bv, i);
	    BLOCK_START (b) += ANOFFSET (delta, block_line_section);
	    BLOCK_END (b) += ANOFFSET (delta, block_line_section);

	    if (BLOCK_RANGES (b) != nullptr)
	      for (int j = 0; j < BLOCK_NRANGES (b); j++)
		{
		  BLOCK_RANGE_START (b, j)
		    += ANOFFSET (delta, block_line_section);
		  BLOCK_RANGE_END (b, j) += ANOFFSET (delta,
						      block_line_section);
		}

	    /* We only want to iterate over the local symbols, not any
	       symbols in included symtabs.  */
	    ALL_DICT_SYMBOLS (BLOCK_MULTIDICT (b), miter, sym)
	      {
		relocate_one_symbol (sym, objfile, delta);
	      }
	  }
      }
  }

  /* This stores relocated addresses and so must be cleared.  This
     will cause it to be recreated on demand.  */
  objfile->psymbol_map.clear ();

  /* Relocate isolated symbols.  */
  {
    struct symbol *iter;

    for (iter = objfile->template_symbols; iter; iter = iter->hash_next)
      relocate_one_symbol (iter, objfile, delta);
  }

  {
    int i;

    for (i = 0; i < objfile->num_sections; ++i)
      (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i);
  }

  /* Rebuild section map next time we need it.  */
  get_objfile_pspace_data (objfile->pspace)->section_map_dirty = 1;

  /* Update the table in exec_ops, used to read memory.  */
  struct obj_section *s;
  ALL_OBJFILE_OSECTIONS (objfile, s)
    {
      int idx = s - objfile->sections;

      exec_set_section_address (bfd_get_filename (objfile->obfd), idx,
				obj_section_addr (s));
    }

  /* Data changed.  */
  return 1;
}

/* Relocate OBJFILE to NEW_OFFSETS.  There should be OBJFILE->NUM_SECTIONS
   entries in new_offsets.  Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.

   The number and ordering of sections does differ between the two objfiles.
   Only their names match.  Also the file offsets will differ (objfile being
   possibly prelinked but separate_debug_objfile is probably not prelinked) but
   the in-memory absolute address as specified by NEW_OFFSETS must match both
   files.  */

void
objfile_relocate (struct objfile *objfile,
		  const struct section_offsets *new_offsets)
{
  struct objfile *debug_objfile;
  int changed = 0;

  changed |= objfile_relocate1 (objfile, new_offsets);

  for (debug_objfile = objfile->separate_debug_objfile;
       debug_objfile;
       debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
    {
      section_addr_info objfile_addrs
	= build_section_addr_info_from_objfile (objfile);

      /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
	 relative ones must be already created according to debug_objfile.  */

      addr_info_make_relative (&objfile_addrs, debug_objfile->obfd);

      gdb_assert (debug_objfile->num_sections
		  == gdb_bfd_count_sections (debug_objfile->obfd));
      std::vector<struct section_offsets>
	new_debug_offsets (SIZEOF_N_SECTION_OFFSETS (debug_objfile->num_sections));
      relative_addr_info_to_section_offsets (new_debug_offsets.data (),
					     debug_objfile->num_sections,
					     objfile_addrs);

      changed |= objfile_relocate1 (debug_objfile, new_debug_offsets.data ());
    }

  /* Relocate breakpoints as necessary, after things are relocated.  */
  if (changed)
    breakpoint_re_set ();
}

/* Rebase (add to the offsets) OBJFILE by SLIDE.  SEPARATE_DEBUG_OBJFILE is
   not touched here.
   Return non-zero iff any change happened.  */

static int
objfile_rebase1 (struct objfile *objfile, CORE_ADDR slide)
{
  struct section_offsets *new_offsets =
    ((struct section_offsets *)
     alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));
  int i;

  for (i = 0; i < objfile->num_sections; ++i)
    new_offsets->offsets[i] = slide;

  return objfile_relocate1 (objfile, new_offsets);
}

/* Rebase (add to the offsets) OBJFILE by SLIDE.  Process also OBJFILE's
   SEPARATE_DEBUG_OBJFILEs.  */

void
objfile_rebase (struct objfile *objfile, CORE_ADDR slide)
{
  struct objfile *debug_objfile;
  int changed = 0;

  changed |= objfile_rebase1 (objfile, slide);

  for (debug_objfile = objfile->separate_debug_objfile;
       debug_objfile;
       debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
    changed |= objfile_rebase1 (debug_objfile, slide);

  /* Relocate breakpoints as necessary, after things are relocated.  */
  if (changed)
    breakpoint_re_set ();
}

/* Return non-zero if OBJFILE has partial symbols.  */

int
objfile_has_partial_symbols (struct objfile *objfile)
{
  if (!objfile->sf)
    return 0;

  /* If we have not read psymbols, but we have a function capable of reading
     them, then that is an indication that they are in fact available.  Without
     this function the symbols may have been already read in but they also may
     not be present in this objfile.  */
  if ((objfile->flags & OBJF_PSYMTABS_READ) == 0
      && objfile->sf->sym_read_psymbols != NULL)
    return 1;

  return objfile->sf->qf->has_symbols (objfile);
}

/* Return non-zero if OBJFILE has full symbols.  */

int
objfile_has_full_symbols (struct objfile *objfile)
{
  return objfile->compunit_symtabs != NULL;
}

/* Return non-zero if OBJFILE has full or partial symbols, either directly
   or through a separate debug file.  */

int
objfile_has_symbols (struct objfile *objfile)
{
  struct objfile *o;