Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 1665 insertions, 0 deletions

diff --git a/gdb/dstread.c b/gdb/dstread.c
new file mode 100644
index 0000000..d23f9f6
--- /dev/null
+++ b/gdb/dstread.c
@@ -0,0 +1,1665 @@
+/* Read apollo DST symbol tables and convert to internal format, for GDB.
+   Contributed by Troy Rollo, University of NSW (troy@cbme.unsw.edu.au).
+   Copyright 1993 Free Software Foundation, Inc.
+
+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.  */
+
+#include "defs.h"
+#include "symtab.h"
+#include "gdbtypes.h"
+#include "breakpoint.h"
+#include "bfd.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "buildsym.h"
+#include "obstack.h"
+
+#include "gdb_string.h"
+
+#include "dst.h"
+
+CORE_ADDR cur_src_start_addr, cur_src_end_addr;
+dst_sec	blocks_info, lines_info, symbols_info;
+
+/* Vector of line number information.  */
+
+static struct linetable *line_vector;
+
+/* Index of next entry to go in line_vector_index.  */
+
+static int line_vector_index;
+
+/* Last line number recorded in the line vector.  */
+
+static int prev_line_number;
+
+/* Number of elements allocated for line_vector currently.  */
+
+static int line_vector_length;
+
+static int
+init_dst_sections PARAMS ((int));
+
+static void
+read_dst_symtab PARAMS ((struct objfile *));
+
+static void
+find_dst_sections PARAMS ((bfd *, sec_ptr, PTR));
+
+static void
+dst_symfile_init PARAMS ((struct objfile *));
+
+static void
+dst_new_init PARAMS ((struct objfile *));
+
+static void
+dst_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int));
+
+static void
+dst_symfile_finish PARAMS ((struct objfile *));
+
+static void
+dst_end_symtab PARAMS ((struct objfile *));
+
+static void
+complete_symtab PARAMS ((char *, CORE_ADDR, unsigned int));
+
+static void
+dst_start_symtab PARAMS ((void));
+
+static void
+dst_record_line PARAMS ((int, CORE_ADDR));
+
+/* Manage the vector of line numbers.  */
+/* FIXME: Use record_line instead.  */
+
+static void
+dst_record_line (line, pc)
+     int line;
+     CORE_ADDR pc;
+{
+  struct linetable_entry *e;
+  /* Make sure line vector is big enough.  */
+
+  if (line_vector_index + 2 >= line_vector_length)
+    {
+      line_vector_length *= 2;
+      line_vector = (struct linetable *)
+	xrealloc ((char *) line_vector, sizeof (struct linetable)
+		  + (line_vector_length
+		     * sizeof (struct linetable_entry)));
+    }
+
+  e = line_vector->item + line_vector_index++;
+  e->line = line; e->pc = pc;
+}
+
+/* Start a new symtab for a new source file.
+   It indicates the start of data for one original source file.  */
+/* FIXME: use start_symtab, like coffread.c now does.  */
+
+static void
+dst_start_symtab ()
+{
+  /* Initialize the source file line number information for this file.  */
+
+  if (line_vector)		/* Unlikely, but maybe possible? */
+    free ((PTR)line_vector);
+  line_vector_index = 0;
+  line_vector_length = 1000;
+  prev_line_number = -2;	/* Force first line number to be explicit */
+  line_vector = (struct linetable *)
+    xmalloc (sizeof (struct linetable)
+	     + line_vector_length * sizeof (struct linetable_entry));
+}
+
+/* Save the vital information from when starting to read a file,
+   for use when closing off the current file.
+   NAME is the file name the symbols came from, START_ADDR is the first
+   text address for the file, and SIZE is the number of bytes of text.  */
+
+static void
+complete_symtab (name, start_addr, size)
+    char *name;
+    CORE_ADDR start_addr;
+    unsigned int size;
+{
+  last_source_file = savestring (name, strlen (name));
+  cur_src_start_addr = start_addr;
+  cur_src_end_addr = start_addr + size;
+
+  if (current_objfile -> ei.entry_point >= cur_src_start_addr &&
+      current_objfile -> ei.entry_point <  cur_src_end_addr)
+    {
+      current_objfile -> ei.entry_file_lowpc = cur_src_start_addr;
+      current_objfile -> ei.entry_file_highpc = cur_src_end_addr;
+    }
+}
+
+/* Finish the symbol definitions for one main source file,
+   close off all the lexical contexts for that file
+   (creating struct block's for them), then make the
+   struct symtab for that file and put it in the list of all such. */
+/* FIXME: Use end_symtab, like coffread.c now does.  */
+
+static void
+dst_end_symtab (objfile)
+     struct objfile *objfile;
+{
+  register struct symtab *symtab;
+  register struct blockvector *blockvector;
+  register struct linetable *lv;
+
+  /* Create the blockvector that points to all the file's blocks.  */
+
+  blockvector = make_blockvector (objfile);
+
+  /* Now create the symtab object for this source file.  */
+  symtab = allocate_symtab (last_source_file, objfile);
+
+  /* Fill in its components.  */
+  symtab->blockvector = blockvector;
+  symtab->free_code = free_linetable;
+  symtab->free_ptr = 0;
+  symtab->filename = last_source_file;
+  symtab->dirname = NULL;
+  symtab->debugformat = obsavestring ("Apollo DST", 10,
+				      &objfile -> symbol_obstack);
+  lv = line_vector;
+  lv->nitems = line_vector_index;
+  symtab->linetable = (struct linetable *)
+    xrealloc ((char *) lv, (sizeof (struct linetable)
+		   + lv->nitems * sizeof (struct linetable_entry)));
+
+  free_named_symtabs (symtab->filename);
+
+  /* Reinitialize for beginning of new file. */
+  line_vector = 0;
+  line_vector_length = -1;
+  last_source_file = NULL;
+}
+
+/* dst_symfile_init ()
+   is the dst-specific initialization routine for reading symbols.
+
+   We will only be called if this is a DST or DST-like file.
+   BFD handles figuring out the format of the file, and code in symtab.c
+   uses BFD's determination to vector to us.
+
+   The ultimate result is a new symtab (or, FIXME, eventually a psymtab).  */
+
+static void
+dst_symfile_init (objfile)
+     struct objfile *objfile;
+{
+  asection	*section;
+  bfd *abfd = objfile->obfd;
+
+  init_entry_point_info (objfile);
+
+}
+
+/* This function is called for every section; it finds the outer limits
+   of the line table (minimum and maximum file offset) so that the
+   mainline code can read the whole thing for efficiency.  */
+
+/* ARGSUSED */
+static void
+find_dst_sections (abfd, asect, vpinfo)
+     bfd *abfd;
+     sec_ptr asect;
+     PTR vpinfo;
+{
+  int size, count;
+  long base;
+  file_ptr offset, maxoff;
+  dst_sec *section;
+
+/* WARNING WILL ROBINSON!  ACCESSING BFD-PRIVATE DATA HERE!  FIXME!  */
+  size = asect->_raw_size;
+  offset = asect->filepos;
+  base = asect->vma;
+/* End of warning */
+
+  section = NULL;
+  if (!strcmp(asect->name, ".blocks"))
+    section = &blocks_info;
+  else if (!strcmp(asect->name, ".lines"))
+    section = &lines_info;
+  else if (!strcmp(asect->name, ".symbols"))
+    section = &symbols_info;
+  if (!section)
+    return;
+  section->size = size;
+  section->position = offset;
+  section->base = base;
+}
+
+
+/* The BFD for this file -- only good while we're actively reading
+   symbols into a psymtab or a symtab.  */
+
+static bfd *symfile_bfd;
+
+/* Read a symbol file, after initialization by dst_symfile_init.  */
+/* FIXME!  Addr and Mainline are not used yet -- this will not work for
+   shared libraries or add_file!  */
+
+/* ARGSUSED */
+static void
+dst_symfile_read (objfile, section_offsets, mainline)
+     struct objfile *objfile;
+     struct section_offsets *section_offsets;
+     int mainline;
+{
+  bfd *abfd = objfile->obfd;
+  char *name = bfd_get_filename (abfd);
+  int desc;
+  register int val;
+  int num_symbols;
+  int symtab_offset;
+  int stringtab_offset;
+
+  symfile_bfd = abfd;			/* Kludge for swap routines */
+
+/* WARNING WILL ROBINSON!  ACCESSING BFD-PRIVATE DATA HERE!  FIXME!  */
+   desc = fileno ((FILE *)(abfd->iostream));	/* File descriptor */
+
+  /* Read the line number table, all at once.  */
+  bfd_map_over_sections (abfd, find_dst_sections, (PTR)NULL);
+
+  val = init_dst_sections (desc);
+  if (val < 0)
+    error ("\"%s\": error reading debugging symbol tables\n", name);
+
+  init_minimal_symbol_collection ();
+  make_cleanup (discard_minimal_symbols, 0);
+
+  /* Now that the executable file is positioned at symbol table,
+     process it and define symbols accordingly.  */
+
+  read_dst_symtab (objfile);
+
+  /* Sort symbols alphabetically within each block.  */
+
+  {
+    struct symtab *s;
+    for (s = objfile -> symtabs; s != NULL; s = s -> next)
+      {
+	sort_symtab_syms (s);
+      }
+  }
+
+  /* Install any minimal symbols that have been collected as the current
+     minimal symbols for this objfile. */
+
+  install_minimal_symbols (objfile);
+}
+
+static void
+dst_new_init (ignore)
+     struct objfile *ignore;
+{
+	/* Nothin' to do */
+}
+
+/* Perform any local cleanups required when we are done with a particular
+   objfile.  I.E, we are in the process of discarding all symbol information
+   for an objfile, freeing up all memory held for it, and unlinking the
+   objfile struct from the global list of known objfiles. */
+
+static void
+dst_symfile_finish (objfile)
+     struct objfile *objfile;
+{
+    /* Nothing to do */
+}
+
+
+/* Get the next line number from the DST. Returns 0 when we hit an
+ * end directive or cannot continue for any other reason.
+ *
+ * Note that ordinary pc deltas are multiplied by two. Apparently
+ * this is what was really intended.
+ */
+static int
+get_dst_line(buffer, pc)
+    signed char **buffer;
+    long *pc;
+{
+	static last_pc = 0;
+	static long last_line = 0;
+	static int last_file = 0;
+	dst_ln_entry_ptr_t entry;
+	int size;
+	dst_src_loc_t *src_loc;
+
+	if (*pc != -1)
+	{
+		last_pc = *pc;
+		*pc = -1;
+	}
+	entry = (dst_ln_entry_ptr_t) *buffer;
+
+	while (dst_ln_ln_delta(*entry) == dst_ln_escape_flag)
+	{
+		switch(entry->esc.esc_code)
+		{
+		case dst_ln_pad:
+			size = 1;         /* pad byte */
+			break;
+		case dst_ln_file:
+		        /* file escape.  Next 4 bytes are a dst_src_loc_t */
+			size = 5;
+			src_loc = (dst_src_loc_t *) (*buffer + 1);
+			last_line = src_loc->line_number;
+			last_file = src_loc->file_index;
+			break;
+		case dst_ln_dln1_dpc1:
+			/* 1 byte line delta, 1 byte pc delta */    
+			last_line += (*buffer)[1];
+			last_pc += 2 * (unsigned char) (*buffer)[2];
+			dst_record_line(last_line, last_pc);
+			size = 3;
+			break;
+		case dst_ln_dln2_dpc2:
+			/* 2 bytes line delta, 2 bytes pc delta */
+			last_line += *(short *) (*buffer + 1);
+			last_pc += 2 * (*(short *) (*buffer + 3));
+			size = 5;
+			dst_record_line(last_line, last_pc);
+			break;
+		case dst_ln_ln4_pc4:
+			/* 4 bytes ABSOLUTE line number, 4 bytes ABSOLUTE pc */
+			last_line = *(unsigned long *) (*buffer + 1);
+			last_pc = *(unsigned long *) (*buffer + 5);
+			size = 9;
+			dst_record_line(last_line, last_pc);
+			break;
+		case dst_ln_dln1_dpc0:
+			/* 1 byte line delta, pc delta = 0 */
+			size = 2;
+			last_line+= (*buffer)[1];
+			break;
+		 case dst_ln_ln_off_1:
+			/* statement escape, stmt # = 1 (2nd stmt on line) */
+			size = 1;
+			break;
+		case dst_ln_ln_off:
+			/* statement escape, stmt # = next byte */
+			size = 2;
+			break;
+		case dst_ln_entry:
+			/* entry escape, next byte is entry number */    
+			size = 2;
+			break;
+		case dst_ln_exit:
+			/* exit escape */
+			size = 1;
+			break;
+		case dst_ln_stmt_end:
+			/* gap escape, 4 bytes pc delta */
+			size = 5;
+			/* last_pc += 2 * (*(long *) (*buffer + 1)); */
+			/* Apparently this isn't supposed to actually modify
+			 * the pc value. Totally weird.
+			 */
+			break;
+		 case dst_ln_escape_11:
+		 case dst_ln_escape_12:
+		 case dst_ln_escape_13:
+			size = 1;
+			break;
+		 case dst_ln_nxt_byte:
+			/* This shouldn't happen. If it does, we're SOL */
+			return 0;
+			break;
+		 case dst_ln_end:
+			/* end escape, final entry follows */
+			return 0;
+		}
+		*buffer += (size < 0) ? -size : size;
+		entry = (dst_ln_entry_ptr_t) *buffer;
+	}
+	last_line += dst_ln_ln_delta(*entry);
+	last_pc += entry->delta.pc_delta * 2;
+	(*buffer)++;
+	dst_record_line(last_line, last_pc);
+	return 1;
+}
+
+static	void
+enter_all_lines(buffer, address)
+    char *buffer;
+    long address;
+{
+    if (buffer)
+	while (get_dst_line(&buffer, &address));
+}
+
+static int
+get_dst_entry(buffer, ret_entry)
+    char *buffer;
+    dst_rec_ptr_t *ret_entry;
+{
+    int size;
+    dst_rec_ptr_t entry;
+    static int last_type;
+    int	ar_size;
+    static unsigned lu3;
+
+    entry = (dst_rec_ptr_t) buffer;
+    switch(entry->rec_type)
+    {
+    case dst_typ_pad:
+	size = 0;
+	break;
+    case dst_typ_comp_unit:
+	size = sizeof(DST_comp_unit(entry));
+	break;
+    case dst_typ_section_tab:
+	size = sizeof(DST_section_tab(entry))
+		+ ((int) DST_section_tab(entry).number_of_sections
+		   - dst_dummy_array_size) * sizeof(long);
+	break;
+    case dst_typ_file_tab:
+	size = sizeof(DST_file_tab(entry))
+		+ ((int) DST_file_tab(entry).number_of_files
+		   - dst_dummy_array_size) * sizeof(dst_file_desc_t);
+	break;
+    case dst_typ_block:
+	size = sizeof(DST_block(entry))
+		+ ((int) DST_block(entry).n_of_code_ranges
+		   - dst_dummy_array_size) * sizeof(dst_code_range_t);
+	break;
+    case dst_typ_5:
+	size = -1;
+	break;
+    case dst_typ_var:
+	size = sizeof(DST_var(entry)) -
+		sizeof(dst_var_loc_long_t) * dst_dummy_array_size +
+		DST_var(entry).no_of_locs *
+		( DST_var(entry).short_locs ?
+		  sizeof(dst_var_loc_short_t):
+		  sizeof(dst_var_loc_long_t));
+	break;
+    case dst_typ_pointer:
+	size = sizeof(DST_pointer(entry));
+	break;
+    case dst_typ_array:
+	size = sizeof(DST_array(entry));
+	break;
+    case dst_typ_subrange:
+	size = sizeof(DST_subrange(entry));
+	break;
+    case dst_typ_set:
+	size = sizeof(DST_set(entry));
+	break;
+    case dst_typ_implicit_enum:
+	size = sizeof(DST_implicit_enum(entry))
+		+ ((int) DST_implicit_enum(entry).nelems
+		   - dst_dummy_array_size) * sizeof(dst_rel_offset_t);
+	break;
+    case dst_typ_explicit_enum:
+	size = sizeof(DST_explicit_enum(entry))
+		+ ((int) DST_explicit_enum(entry).nelems
+		   - dst_dummy_array_size) * sizeof(dst_enum_elem_t);
+	break;
+    case dst_typ_short_rec:
+	size = sizeof(DST_short_rec(entry))
+		+ DST_short_rec(entry).nfields * sizeof(dst_short_field_t)
+		- dst_dummy_array_size * sizeof(dst_field_t);
+	break;
+    case dst_typ_short_union:
+	size = sizeof(DST_short_union(entry))
+		+ DST_short_union(entry).nfields * sizeof(dst_short_field_t)
+		- dst_dummy_array_size * sizeof(dst_field_t);
+	break;
+    case dst_typ_file:
+	size = sizeof(DST_file(entry));
+	break;
+    case dst_typ_offset:
+	size = sizeof(DST_offset(entry));
+	break;
+    case dst_typ_alias:
+	size = sizeof(DST_alias(entry));
+	break;
+    case dst_typ_signature:
+	size = sizeof(DST_signature(entry)) +
+		((int) DST_signature(entry).nargs -
+		 dst_dummy_array_size) * sizeof(dst_arg_t);
+	break;
+    case dst_typ_21:
+	size = -1;
+	break;
+    case dst_typ_old_label:
+	size = sizeof(DST_old_label(entry));
+	break;
+    case dst_typ_scope:
+	size = sizeof(DST_scope(entry));
+	break;
+    case dst_typ_end_scope:
+	size = 0;
+	break;
+    case dst_typ_25:
+    case dst_typ_26:
+	size = -1;
+	break;
+    case dst_typ_string_tab:
+    case dst_typ_global_name_tab:
+	size = sizeof(DST_string_tab(entry))
+		+ DST_string_tab(entry).length
+		- dst_dummy_array_size;
+	break;
+    case dst_typ_forward:
+	size = sizeof(DST_forward(entry));
+	get_dst_entry((char *) entry + DST_forward(entry).rec_off, &entry);
+	break;
+    case dst_typ_aux_size:
+	size = sizeof(DST_aux_size(entry));
+	break;
+    case dst_typ_aux_align:
+	size = sizeof(DST_aux_align(entry));
+	break;
+    case dst_typ_aux_field_size:
+	size = sizeof(DST_aux_field_size(entry));
+	break;
+    case dst_typ_aux_field_off:
+	size = sizeof(DST_aux_field_off(entry));
+	break;
+    case dst_typ_aux_field_align:
+	size = sizeof(DST_aux_field_align(entry));
+	break;
+    case dst_typ_aux_qual:
+	size = sizeof(DST_aux_qual(entry));
+	break;
+    case dst_typ_aux_var_bound:
+	size = sizeof(DST_aux_var_bound(entry));
+	break;
+    case dst_typ_extension:
+	size = DST_extension(entry).rec_size;
+	break;
+    case dst_typ_string:
+	size = sizeof(DST_string(entry));
+	break;
+    case dst_typ_old_entry:
+	size = 48; /* Obsolete entry type */
+	break;
+    case dst_typ_const:
+	size = sizeof(DST_const(entry))
+		+ DST_const(entry).value.length
+		- sizeof(DST_const(entry).value.val);
+	break;
+    case dst_typ_reference:
+	size = sizeof(DST_reference(entry));
+	break;
+    case dst_typ_old_record:
+    case dst_typ_old_union:
+    case dst_typ_record:
+    case dst_typ_union:
+	size = sizeof(DST_record(entry))
+		+ ((int) DST_record(entry).nfields
+		   - dst_dummy_array_size) * sizeof(dst_field_t);
+	break;
+    case dst_typ_aux_type_deriv:
+	size = sizeof(DST_aux_type_deriv(entry));
+	break;
+    case dst_typ_locpool:
+	size = sizeof(DST_locpool(entry))
+		+ ((int) DST_locpool(entry).length -
+		   dst_dummy_array_size);
+	break;
+    case dst_typ_variable:
+	size = sizeof(DST_variable(entry));
+	break;
+    case dst_typ_label:
+	size = sizeof(DST_label(entry));
+	break;
+    case dst_typ_entry:
+	size = sizeof(DST_entry(entry));
+	break;
+    case dst_typ_aux_lifetime:
+	size = sizeof(DST_aux_lifetime(entry));
+	break;
+    case dst_typ_aux_ptr_base:
+	size = sizeof(DST_aux_ptr_base(entry));
+	break;
+    case dst_typ_aux_src_range:
+	size = sizeof(DST_aux_src_range(entry));
+	break;
+    case dst_typ_aux_reg_val:
+	size = sizeof(DST_aux_reg_val(entry));
+	break;
+    case dst_typ_aux_unit_names:
+	size = sizeof(DST_aux_unit_names(entry))
+		+ ((int) DST_aux_unit_names(entry).number_of_names
+		   - dst_dummy_array_size) * sizeof(dst_rel_offset_t);
+	break;
+    case dst_typ_aux_sect_info:
+	size = sizeof(DST_aux_sect_info(entry))
+		+ ((int) DST_aux_sect_info(entry).number_of_refs
+		   - dst_dummy_array_size) * sizeof(dst_sect_ref_t);
+	break;
+    default:
+	size = -1;
+	break;
+    }
+    if (size == -1)
+    {
+	fprintf_unfiltered(gdb_stderr, "Warning: unexpected DST entry type (%d) found\nLast valid entry was of type: %d\n",
+		(int) entry->rec_type,
+		last_type);
+	fprintf_unfiltered(gdb_stderr, "Last unknown_3 value: %d\n", lu3);
+	size = 0;
+    }
+    else
+	last_type = entry->rec_type;
+    if (size & 1) /* Align on a word boundary */
+	size++;
+   size += 2;
+   *ret_entry = entry;
+   return size;
+}
+
+static	int next_dst_entry(buffer, entry, table)
+    char **buffer;
+    dst_rec_ptr_t *entry;
+    dst_sec *table;
+{
+    if (*buffer - table->buffer >= table->size)
+    {
+	*entry = NULL;
+	return 0;
+    }
+    *buffer += get_dst_entry(*buffer, entry);
+    return 1;
+}
+
+#define NEXT_BLK(a, b) next_dst_entry(a, b, &blocks_info)
+#define NEXT_SYM(a, b) next_dst_entry(a, b, &symbols_info)
+#define	DST_OFFSET(a, b) ((char *) (a) + (b))
+
+static	dst_rec_ptr_t	section_table = NULL;
+
+char *
+get_sec_ref(ref)
+    dst_sect_ref_t *ref;
+{
+	dst_sec *section = NULL;
+	long offset;
+
+	if (!section_table || !ref->sect_index)
+		return NULL;
+	offset = DST_section_tab(section_table).section_base[ref->sect_index-1]
+		+ ref->sect_offset;
+	if (offset >= blocks_info.base &&
+	    offset < blocks_info.base + blocks_info.size)
+		section = &blocks_info;
+	else if (offset >= symbols_info.base &&
+		 offset < symbols_info.base + symbols_info.size)
+		section = &symbols_info;
+	else if (offset >= lines_info.base &&
+		 offset < lines_info.base + lines_info.size)
+		section = &lines_info;
+	if (!section)
+		return NULL;
+	return section->buffer + (offset - section->base);
+}
+
+CORE_ADDR
+dst_get_addr(int section, long offset)
+{
+	if (!section_table || !section)
+		return 0;
+	return DST_section_tab(section_table).section_base[section-1] + offset;
+}
+
+CORE_ADDR
+dst_sym_addr(ref)
+    dst_sect_ref_t *ref;
+{
+	if (!section_table || !ref->sect_index)
+		return 0;
+	return DST_section_tab(section_table).section_base[ref->sect_index-1]
+		+ ref->sect_offset;
+}
+
+static struct type *
+create_new_type(objfile)
+    struct objfile *objfile;
+{
+	struct type *type;
+
+	type = (struct type *)
+		obstack_alloc (&objfile->symbol_obstack, sizeof (struct type));
+	memset(type, 0, sizeof(struct type));
+	return type;
+}
+
+static struct symbol *
+create_new_symbol(objfile, name)
+    struct objfile *objfile;
+    char *name;
+{
+	struct symbol *sym = (struct symbol *)
+	       obstack_alloc (&objfile->symbol_obstack, sizeof (struct symbol));
+	memset (sym, 0, sizeof (struct symbol));
+	SYMBOL_NAME (sym) = obsavestring (name, strlen (name),
+					  &objfile->symbol_obstack);
+	SYMBOL_VALUE (sym) = 0;
+	SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
+
+	SYMBOL_CLASS (sym) = LOC_BLOCK;
+	return sym;
+};
+
+static struct type *
+decode_dst_type PARAMS ((struct objfile *, dst_rec_ptr_t));
+
+static struct type *
+decode_type_desc(objfile, type_desc, base)
+	struct objfile *objfile;
+	dst_type_t *type_desc;
+	dst_rec_ptr_t base;
+{
+	struct type *type;
+	dst_rec_ptr_t entry;
+	if (type_desc->std_type.user_defined_type)
+	{
+		entry = (dst_rec_ptr_t) DST_OFFSET(base,
+					dst_user_type_offset(*type_desc));
+		type = decode_dst_type(objfile, entry);
+	}
+	else
+	{
+		switch(type_desc->std_type.dtc)
+		{
+		case dst_int8_type:
+			type = builtin_type_signed_char;
+			break;
+		case dst_int16_type:
+			type = builtin_type_short;
+			break;
+		case dst_int32_type:
+			type = builtin_type_long;
+			break;
+		case dst_uint8_type:
+			type = builtin_type_unsigned_char;
+			break;
+		case dst_uint16_type:
+			type = builtin_type_unsigned_short;
+			break;
+		case dst_uint32_type:
+			type = builtin_type_unsigned_long;
+			break;
+		case dst_real32_type:
+			type = builtin_type_float;
+			break;
+		case dst_real64_type:
+			type = builtin_type_double;
+			break;
+		case dst_complex_type:
+			type = builtin_type_complex;
+			break;
+		case dst_dcomplex_type:
+			type = builtin_type_double_complex;
+			break;
+		case dst_bool8_type:
+			type = builtin_type_char;
+			break;
+		case dst_bool16_type:
+			type = builtin_type_short;
+			break;
+		case dst_bool32_type:
+			type = builtin_type_long;
+			break;
+		case dst_char_type:
+			type = builtin_type_char;
+			break;
+		/* The next few are more complex. I will take care
+		 * of them properly at a later point.
+		 */
+		case dst_string_type:
+			type = builtin_type_void;
+			break;
+		case dst_ptr_type:
+			type = builtin_type_void;
+			break;
+		case dst_set_type:
+			type = builtin_type_void;
+			break;
+		case dst_proc_type:
+			type = builtin_type_void;
+			break;
+		case dst_func_type:
+			type = builtin_type_void;
+			break;
+		/* Back tto some ordinary ones */
+		case dst_void_type:
+			type = builtin_type_void;
+			break;
+		case dst_uchar_type:
+			type = builtin_type_unsigned_char;
+			break;
+		default:
+			type = builtin_type_void;
+			break;
+		}
+	} 
+	return type;
+}
+
+struct	structure_list
+    {
+    struct structure_list *next;
+    struct type *type;
+    };
+
+static struct structure_list *struct_list = NULL;
+
+static struct type *
+find_dst_structure(name)
+    char *name;
+{
+	struct structure_list *element;
+
+	for (element = struct_list; element; element = element->next)
+		if (!strcmp(name, TYPE_NAME(element->type)))
+			return element->type;
+	return NULL;
+}
+
+
+static struct type *
+decode_dst_structure(objfile, entry, code, version)
+    struct objfile *objfile;
+    dst_rec_ptr_t entry;
+    int code;
+    int version;
+{
+	struct	type *type, *child_type;
+	char	*struct_name;
+	char	*name, *field_name;
+	int	i;
+	int	fieldoffset, fieldsize;
+	dst_type_t type_desc;
+	struct structure_list *element;
+
+	struct_name = DST_OFFSET(entry, DST_record(entry).noffset);
+	name = concat( (code == TYPE_CODE_UNION)?"union ":"struct ",
+			struct_name, NULL);
+	type = find_dst_structure(name);
+	if (type)
+	{
+		free((PTR) name);
+		return type;
+	}
+	type = create_new_type(objfile);
+	TYPE_NAME(type) = obstack_copy0 (&objfile->symbol_obstack,
+						name, strlen(name));
+	free((PTR) name);
+	TYPE_CODE(type) = code;
+	TYPE_LENGTH(type) = DST_record(entry).size;
+	TYPE_NFIELDS(type) = DST_record(entry).nfields;
+	TYPE_FIELDS(type) = (struct field *)
+	       obstack_alloc (&objfile->symbol_obstack, sizeof (struct field) *
+					DST_record(entry).nfields);
+	fieldoffset = fieldsize = 0;
+	INIT_CPLUS_SPECIFIC(type);
+	element = (struct structure_list *)
+				xmalloc(sizeof(struct structure_list));
+	element->type = type;
+	element->next = struct_list;
+	struct_list = element;
+	for (i = 0; i < DST_record(entry).nfields; i++)
+	{
+		switch (version)
+		{
+		case 2:
+			field_name = DST_OFFSET(entry,
+					DST_record(entry).f.ofields[i].noffset);
+			fieldoffset = DST_record(entry).f.ofields[i].foffset*8 +
+				      DST_record(entry).f.ofields[i].bit_offset;
+			fieldsize = DST_record(entry).f.ofields[i].size;
+			type_desc = DST_record(entry).f.ofields[i].type_desc;
+			break;
+		case 1:
+			field_name = DST_OFFSET(entry,
+					DST_record(entry).f.fields[i].noffset);
+			type_desc = DST_record(entry).f.fields[i].type_desc;
+			switch(DST_record(entry).f.fields[i].f.field_loc.format_tag)
+			{
+			case dst_field_byte:
+				fieldoffset = DST_record(entry).f.
+					fields[i].f.field_byte.offset * 8;
+				fieldsize = -1;
+				break;
+			case dst_field_bit:
+				fieldoffset = DST_record(entry).f.
+					fields[i].f.field_bit.byte_offset * 8 +
+					      DST_record(entry).f.
+					fields[i].f.field_bit.bit_offset;
+				fieldsize = DST_record(entry).f.
+					fields[i].f.field_bit.nbits;
+				break;
+			case dst_field_loc:
+				fieldoffset += fieldsize;
+				fieldsize = -1;
+				break;
+			}
+			break;
+		case 0:
+			field_name = DST_OFFSET(entry,
+					DST_record(entry).f.sfields[i].noffset);
+			fieldoffset = DST_record(entry).f.sfields[i].foffset;
+			type_desc = DST_record(entry).f.sfields[i].type_desc;
+			if (i < DST_record(entry).nfields - 1)
+				fieldsize = DST_record(entry).f.sfields[i+1].foffset;
+			else
+				fieldsize = DST_record(entry).size;
+			fieldsize -= fieldoffset;
+			fieldoffset *= 8;
+			fieldsize *= 8;
+		}
+		TYPE_FIELDS(type)[i].name = 
+			obstack_copy0 (&objfile->symbol_obstack,
+						field_name, strlen(field_name));
+		TYPE_FIELDS(type)[i].type = decode_type_desc(objfile,
+						&type_desc,
+						entry);
+		if (fieldsize == -1)
+			fieldsize = TYPE_LENGTH(TYPE_FIELDS(type)[i].type) *
+					8;
+		TYPE_FIELDS(type)[i].bitsize = fieldsize;
+		TYPE_FIELDS(type)[i].bitpos = fieldoffset;
+	}
+	return type;
+}
+
+static struct type *
+decode_dst_type(objfile, entry)
+    struct objfile *objfile;
+    dst_rec_ptr_t entry;
+{
+	struct type *child_type, *type, *range_type, *index_type;
+
+	switch(entry->rec_type)
+	{
+	case dst_typ_var:
+		return decode_type_desc(objfile,
+				 	&DST_var(entry).type_desc,
+					entry);
+		break;
+	case dst_typ_variable:
+		return decode_type_desc(objfile,
+				 	&DST_variable(entry).type_desc,
+					entry);
+		break;
+	case dst_typ_short_rec:
+		return decode_dst_structure(objfile, entry, TYPE_CODE_STRUCT,0);
+	case dst_typ_short_union:
+		return decode_dst_structure(objfile, entry, TYPE_CODE_UNION, 0);
+	case dst_typ_union:
+		return decode_dst_structure(objfile, entry, TYPE_CODE_UNION, 1);
+	case dst_typ_record:
+		return decode_dst_structure(objfile, entry, TYPE_CODE_STRUCT,1);
+	case dst_typ_old_union:
+		return decode_dst_structure(objfile, entry, TYPE_CODE_UNION, 2);
+	case dst_typ_old_record:
+		return decode_dst_structure(objfile, entry, TYPE_CODE_STRUCT,2);
+	case dst_typ_pointer:
+		return make_pointer_type(
+				decode_type_desc(objfile,
+					&DST_pointer(entry).type_desc,
+					entry),
+				NULL);
+	case dst_typ_array:
+		child_type = decode_type_desc(objfile,
+					     &DST_pointer(entry).type_desc,
+					     entry);
+		index_type = lookup_fundamental_type(objfile,
+							FT_INTEGER);
+		range_type = create_range_type ((struct type *) NULL,
+				index_type, DST_array(entry).lo_bound,
+					DST_array(entry).hi_bound);
+		return create_array_type ((struct type *) NULL, child_type,
+					range_type);
+	case dst_typ_alias:
+		return decode_type_desc(objfile,
+					&DST_alias(entry).type_desc,
+					entry);
+	default:
+		return builtin_type_int;
+	}
+}
+
+struct	symbol_list {
+	struct symbol_list *next;
+	struct symbol *symbol;
+};
+
+static	struct	symbol_list *dst_global_symbols = NULL;
+static	int	total_globals = 0;
+
+static void
+decode_dst_locstring(locstr, sym)
+    char *locstr;
+    struct symbol *sym;
+{
+	dst_loc_entry_t *entry, *next_entry;
+	CORE_ADDR	temp;
+	int count = 0;
+
+	while(1)
+	{
+		if (count++ == 100)
+		{
+			fprintf_unfiltered(gdb_stderr, "Error reading locstring\n");
+			break;
+		}
+		entry = (dst_loc_entry_t *) locstr;
+		next_entry = (dst_loc_entry_t *) (locstr + 1);
+		switch (entry->header.code)
+		{
+		case dst_lsc_end:	/* End of string */
+			return;
+		case dst_lsc_indirect:/* Indirect through previous. Arg == 6 */
+					/* Or register ax x == arg */
+			if (entry->header.arg < 6)
+			{
+				SYMBOL_CLASS(sym) = LOC_REGISTER;
+				SYMBOL_VALUE(sym) = entry->header.arg + 8;
+			}
+			/* We predict indirects */
+			locstr++;
+			break;
+		case dst_lsc_dreg:
+			SYMBOL_CLASS(sym) = LOC_REGISTER;
+			SYMBOL_VALUE(sym) = entry->header.arg;
+			locstr++;
+			break;
+		case dst_lsc_section:/* Section (arg+1) */
+			SYMBOL_VALUE(sym) = dst_get_addr(entry->header.arg+1, 0);
+			locstr++;
+			break;
+		case dst_lsc_sec_byte: /* Section (next_byte+1) */
+			SYMBOL_VALUE(sym) = dst_get_addr(locstr[1]+1, 0);
+			locstr+=2;
+			break;
+		case dst_lsc_add:	/* Add (arg+1)*2 */
+		case dst_lsc_sub:	/* Subtract (arg+1)*2 */
+			temp = (entry->header.arg + 1) * 2;
+			locstr++;
+			if (*locstr == dst_multiply_256)
+			{
+				temp <<= 8;
+				locstr++;
+			}
+			switch(entry->header.code)
+			{
+			case dst_lsc_add:
+				if (SYMBOL_CLASS(sym) == LOC_LOCAL)
+					SYMBOL_CLASS(sym) = LOC_ARG;
+				SYMBOL_VALUE(sym) += temp;
+				break;
+			case dst_lsc_sub:
+				SYMBOL_VALUE(sym) -= temp;
+				break;
+			}
+			break;
+		case dst_lsc_add_byte:
+		case dst_lsc_sub_byte:
+			switch (entry->header.arg & 0x03)
+			{
+			case 1:
+				temp = (unsigned char) locstr[1];
+				locstr += 2;
+				break;
+			case 2:
+				temp = * (unsigned short *) (locstr + 1);
+				locstr += 3;
+				break;
+			case 3:
+				temp = * (unsigned long *) (locstr + 1);
+				locstr += 5;
+				break;
+			}
+			if (*locstr == dst_multiply_256)
+			{
+				temp <<= 8;
+				locstr++;
+			}
+			switch(entry->header.code)
+			{
+			case dst_lsc_add_byte:
+				if (SYMBOL_CLASS(sym) == LOC_LOCAL)
+					SYMBOL_CLASS(sym) = LOC_ARG;
+				SYMBOL_VALUE(sym) += temp;
+				break;
+			case dst_lsc_sub_byte:
+				SYMBOL_VALUE(sym) -= temp;
+				break;
+			}
+			break;
+		case dst_lsc_sbreg:	/* Stack base register (frame pointer). Arg==0*/
+			if (next_entry->header.code != dst_lsc_indirect)
+			{
+				SYMBOL_VALUE(sym) = 0;
+				SYMBOL_CLASS(sym) = LOC_STATIC;
+				return;
+			}
+			SYMBOL_VALUE(sym) = 0;
+			SYMBOL_CLASS(sym) = LOC_LOCAL;
+			locstr++;
+			break;
+		default:
+			SYMBOL_VALUE(sym) = 0;
+			SYMBOL_CLASS(sym) = LOC_STATIC;
+			return;
+		}
+	}
+}
+
+static struct symbol_list *
+process_dst_symbols(objfile, entry, name, nsyms_ret)
+    struct objfile *objfile;
+    dst_rec_ptr_t entry;
+    char *name;
+    int *nsyms_ret;
+{
+	struct symbol_list *list = NULL, *element;
+	struct symbol *sym;
+	char *symname;
+	int nsyms = 0;
+	char *location;
+	long line;
+	dst_type_t symtype;
+	struct type *type;
+	dst_var_attr_t attr;
+	dst_var_loc_t loc_type;
+	unsigned loc_index;
+	long	loc_value;
+
+	if (!entry)
+	{
+		*nsyms_ret = 0;
+		return NULL;
+	}
+	location = (char *) entry;
+	while (NEXT_SYM(&location, &entry) &&
+	       entry->rec_type != dst_typ_end_scope)
+	{
+		if (entry->rec_type == dst_typ_var)
+		{
+			if (DST_var(entry).short_locs)
+			{
+				loc_type = DST_var(entry).locs.shorts[0].loc_type;
+				loc_index = DST_var(entry).locs.shorts[0].loc_index;
+				loc_value = DST_var(entry).locs.shorts[0].location;
+			}
+			else
+			{
+				loc_type = DST_var(entry).locs.longs[0].loc_type;
+				loc_index = DST_var(entry).locs.longs[0].loc_index;
+				loc_value = DST_var(entry).locs.longs[0].location;
+			}
+			if (loc_type == dst_var_loc_external)
+				continue;
+			symname = DST_OFFSET(entry, DST_var(entry).noffset);
+			line = DST_var(entry).src_loc.line_number;
+			symtype = DST_var(entry).type_desc;
+			attr = DST_var(entry).attributes;
+		}
+		else if (entry->rec_type == dst_typ_variable)
+		{
+			symname = DST_OFFSET(entry,
+						DST_variable(entry).noffset);
+			line = DST_variable(entry).src_loc.line_number;
+			symtype = DST_variable(entry).type_desc;
+			attr = DST_variable(entry).attributes;
+		}
+		else
+		{
+			continue;
+		}
+		if (symname && name && !strcmp(symname, name))
+			/* It's the function return value */
+			continue;
+		sym = create_new_symbol(objfile, symname);
+
+		if ((attr & (1<<dst_var_attr_global)) ||
+		    (attr & (1<<dst_var_attr_static)))
+			SYMBOL_CLASS(sym) = LOC_STATIC;
+		else
+			SYMBOL_CLASS(sym) = LOC_LOCAL;
+		SYMBOL_LINE(sym) = line;
+		SYMBOL_TYPE(sym) = decode_type_desc(objfile, &symtype,
+						entry);
+		SYMBOL_VALUE(sym) = 0;
+		switch (entry->rec_type)
+		{
+		case dst_typ_var:
+			switch(loc_type)
+			{
+			case dst_var_loc_abs:
+				SYMBOL_VALUE_ADDRESS(sym) = loc_value;
+				break;
+			case dst_var_loc_sect_off:
+			case dst_var_loc_ind_sect_off: /* What is this? */
+				SYMBOL_VALUE_ADDRESS(sym) = dst_get_addr(
+						loc_index,
+						loc_value);
+				break;
+			case dst_var_loc_ind_reg_rel: /* What is this? */
+			case dst_var_loc_reg_rel:
+				/* If it isn't fp relative, specify the
+				 * register it's relative to.
+				 */
+				if (loc_index)
+				{
+					sym->aux_value.basereg = loc_index;
+				}
+				SYMBOL_VALUE(sym) = loc_value;
+				if (loc_value > 0 &&
+				    SYMBOL_CLASS(sym) == LOC_BASEREG)
+					SYMBOL_CLASS(sym) = LOC_BASEREG_ARG;
+				break;
+			case dst_var_loc_reg:
+				SYMBOL_VALUE(sym) = loc_index;
+				SYMBOL_CLASS(sym) = LOC_REGISTER;
+				break;
+			}
+			break;
+		case dst_typ_variable:
+			/* External variable..... don't try to interpret
+			 * its nonexistant locstring.
+			 */
+			if (DST_variable(entry).loffset == -1)
+				continue;
+			decode_dst_locstring(DST_OFFSET(entry,
+						DST_variable(entry).loffset),
+					     sym);
+		}
+		element = (struct symbol_list *)
+				xmalloc(sizeof(struct symbol_list));
+		
+		if (attr & (1<<dst_var_attr_global))
+		{
+			element->next = dst_global_symbols;
+			dst_global_symbols = element;
+			total_globals++;
+		}
+		else
+		{
+			element->next = list;
+			list = element;
+			nsyms++;
+		}
+		element->symbol = sym;
+	}
+	*nsyms_ret = nsyms;
+	return list;
+}
+
+
+static struct symbol *
+process_dst_function(objfile, entry, name, address)
+    struct objfile *objfile;
+    dst_rec_ptr_t entry;
+    char *name;
+    CORE_ADDR address;
+{
+	struct	symbol *sym;
+	struct	type *type, *ftype;
+	dst_rec_ptr_t sym_entry, typ_entry;
+	char *location;
+	struct symbol_list *element;
+
+	type = builtin_type_int;
+	sym = create_new_symbol(objfile, name);
+	SYMBOL_CLASS(sym) = LOC_BLOCK;
+
+	if (entry)
+	{
+		location = (char *) entry;
+		do
+		{
+			NEXT_SYM(&location, &sym_entry);
+		} while (sym_entry && sym_entry->rec_type != dst_typ_signature);
+
+		if (sym_entry)
+		{
+			SYMBOL_LINE(sym) =
+				DST_signature(sym_entry).src_loc.line_number;
+			if (DST_signature(sym_entry).result)
+			{
+				typ_entry = (dst_rec_ptr_t)
+					    DST_OFFSET(sym_entry,
+					    DST_signature(sym_entry).result);
+				type = decode_dst_type(objfile, typ_entry);
+			}
+		}
+	}
+
+	if (!type->function_type)
+	{
+		ftype = create_new_type(objfile);
+		type->function_type = ftype;
+		ftype->target_type = type;
+		ftype->code = TYPE_CODE_FUNC;
+	}
+	SYMBOL_TYPE(sym) = type->function_type;
+
+	/* Now add ourselves to the global symbols list */
+	element = (struct symbol_list *)
+			xmalloc(sizeof(struct symbol_list));
+
+	element->next = dst_global_symbols;
+	dst_global_symbols = element;
+	total_globals++;
+	element->symbol = sym;
+
+	return sym;
+}
+
+static struct block *
+process_dst_block(objfile, entry)
+    struct objfile *objfile;
+    dst_rec_ptr_t entry;
+{
+	struct	block	*block;
+	struct	symbol	*function = NULL;
+	CORE_ADDR address;
+	long	size;
+	char	*name;
+	dst_rec_ptr_t child_entry, symbol_entry;
+	struct block *child_block;
+	int	total_symbols = 0;
+	char	fake_name[20];
+	static	long	fake_seq = 0;
+	struct symbol_list *symlist, *nextsym;
+	int	symnum;
+
+	if (DST_block(entry).noffset)
+		name = DST_OFFSET(entry, DST_block(entry).noffset);
+	else
+		name = NULL;
+	if (DST_block(entry).n_of_code_ranges)
+	{
+		address = dst_sym_addr(
+				&DST_block(entry).code_ranges[0].code_start);
+		size = DST_block(entry).code_ranges[0].code_size;
+	}
+	else
+	{
+		address = -1;
+		size = 0;
+	}
+	symbol_entry = (dst_rec_ptr_t) get_sec_ref(&DST_block(entry).symbols_start);
+	switch(DST_block(entry).block_type)
+	{
+	/* These are all really functions. Even the "program" type.
+	 * This is because the Apollo OS was written in Pascal, and
+	 * in Pascal, the main procedure is described as the Program.
+	 * Cute, huh?
+	 */
+	case dst_block_procedure:
+	case dst_block_function:
+	case dst_block_subroutine:
+	case dst_block_program:
+		prim_record_minimal_symbol(name, address, mst_text, objfile);
+		function = process_dst_function(
+			objfile,
+			symbol_entry,
+			name,
+			address);
+		enter_all_lines(get_sec_ref(&DST_block(entry).code_ranges[0].lines_start), address);
+		break;
+	case dst_block_block_data:
+		break;
+
+	default:
+		/* GDB has to call it something, and the module name
+		 * won't cut it
+		 */
+		sprintf(fake_name, "block_%08lx", fake_seq++);
+		function = process_dst_function(
+			objfile, NULL, fake_name, address);
+		break;
+	}
+	symlist = process_dst_symbols(objfile, symbol_entry,
+					name, &total_symbols);
+	block = (struct block *)
+	    obstack_alloc (&objfile->symbol_obstack,
+				sizeof (struct block) +
+				(total_symbols - 1) * sizeof (struct symbol *));
+
+	symnum = 0;
+	while (symlist)
+	{
+		nextsym = symlist->next;
+
+		block->sym[symnum] = symlist->symbol;
+
+		free((PTR) symlist);
+		symlist = nextsym;
+		symnum++;
+	}
+	BLOCK_NSYMS (block) = total_symbols;
+	BLOCK_START (block) = address;
+	BLOCK_END (block) = address + size;
+	BLOCK_SUPERBLOCK (block) = 0;
+	if (function)
+	{
+		SYMBOL_BLOCK_VALUE (function) = block;
+		BLOCK_FUNCTION (block) = function;
+	}
+	else
+		BLOCK_FUNCTION (block) = 0;
+
+	if (DST_block(entry).child_block_off)
+	{
+		child_entry = (dst_rec_ptr_t) DST_OFFSET(entry,
+					DST_block(entry).child_block_off);
+		while (child_entry)
+		{
+			child_block = process_dst_block(objfile, child_entry);
+			if (child_block)
+			{
+				if (BLOCK_START(child_block) <
+				     BLOCK_START(block) ||
+				    BLOCK_START(block) == -1)
+					BLOCK_START(block) =
+					     BLOCK_START(child_block);
+				if (BLOCK_END(child_block) >
+				     BLOCK_END(block) ||
+				    BLOCK_END(block) == -1)
+					BLOCK_END(block) =
+					     BLOCK_END(child_block);
+				BLOCK_SUPERBLOCK (child_block) = block;
+			}
+			if (DST_block(child_entry).sibling_block_off)
+				child_entry = (dst_rec_ptr_t) DST_OFFSET(
+					child_entry,
+					DST_block(child_entry).sibling_block_off);
+			else
+				child_entry = NULL;
+		}
+	}
+	record_pending_block (objfile, block, NULL);
+	return block;
+}
+
+
+static void
+read_dst_symtab (objfile)
+     struct objfile *objfile;
+{
+	char	*buffer;
+	dst_rec_ptr_t entry, file_table, root_block;
+	char	*source_file;
+	struct	block *block, *global_block;
+	int	symnum;
+	struct symbol_list *nextsym;
+	int	module_num = 0;
+	struct	structure_list *element;
+
+	current_objfile = objfile;
+	buffer = blocks_info.buffer;
+	while (NEXT_BLK(&buffer, &entry))
+	{
+		if (entry->rec_type == dst_typ_comp_unit)
+		{
+			file_table = (dst_rec_ptr_t) DST_OFFSET(entry,
+					DST_comp_unit(entry).file_table);
+			section_table = (dst_rec_ptr_t) DST_OFFSET(entry,
+					DST_comp_unit(entry).section_table);
+			root_block = (dst_rec_ptr_t) DST_OFFSET(entry,
+					DST_comp_unit(entry).root_block_offset);
+			source_file = DST_OFFSET(file_table,
+					DST_file_tab(file_table).files[0].noffset);
+			/* Point buffer to the start of the next comp_unit */
+			buffer = DST_OFFSET(entry,
+					DST_comp_unit(entry).data_size);
+			dst_start_symtab();
+
+			block = process_dst_block(objfile, root_block);
+
+			global_block = (struct block *)
+				    obstack_alloc (&objfile->symbol_obstack,
+					sizeof (struct block) +
+					(total_globals - 1) *
+					sizeof (struct symbol *));
+			BLOCK_NSYMS(global_block) = total_globals;
+			for (symnum = 0; symnum < total_globals; symnum++)
+			{
+				nextsym = dst_global_symbols->next;
+
+				global_block->sym[symnum] =
+						dst_global_symbols->symbol;
+
+				free((PTR) dst_global_symbols);
+				dst_global_symbols = nextsym;
+			}
+			dst_global_symbols = NULL;
+			total_globals = 0;
+			BLOCK_FUNCTION(global_block) = 0;
+			BLOCK_START(global_block) = BLOCK_START(block);
+			BLOCK_END(global_block) = BLOCK_END(block);
+			BLOCK_SUPERBLOCK(global_block) = 0;
+			BLOCK_SUPERBLOCK(block) = global_block;
+			record_pending_block (objfile, global_block, NULL);
+
+			complete_symtab(source_file,
+					BLOCK_START(block), 
+					BLOCK_END(block) - BLOCK_START(block));
+			module_num++;
+			dst_end_symtab(objfile);
+		}
+	}
+	if (module_num)
+		prim_record_minimal_symbol("<end_of_program>",
+				BLOCK_END(block), mst_text, objfile);
+	/* One more faked symbol to make sure nothing can ever run off the
+	 * end of the symbol table. This one represents the end of the
+	 * text space. It used to be (CORE_ADDR) -1 (effectively the highest
+	 * int possible), but some parts of gdb treated it as a signed
+	 * number and failed comparisons. We could equally use 7fffffff,
+	 * but no functions are ever mapped to an address higher than
+	 * 40000000
+	 */
+	prim_record_minimal_symbol("<end_of_text>",
+				(CORE_ADDR) 0x40000000,
+				mst_text, objfile);
+	while (struct_list)
+	{
+		element = struct_list;
+		struct_list = element->next;
+		free((PTR) element);
+	}
+}
+
+
+/* Support for line number handling */
+static char *linetab = NULL;
+static long linetab_offset;
+static unsigned long linetab_size;
+
+/* Read in all the line numbers for fast lookups later.  Leave them in
+   external (unswapped) format in memory; we'll swap them as we enter
+   them into GDB's data structures.  */
+static int
+init_one_section(chan, secinfo)
+    int chan;
+    dst_sec *secinfo;
+{
+  if (secinfo->size == 0
+      || lseek(chan, secinfo->position, 0) == -1
+      || (secinfo->buffer = xmalloc(secinfo->size)) == NULL
+      || myread(chan, secinfo->buffer, secinfo->size) == -1)
+	return 0;
+  else
+	return 1;
+}
+ 
+static int
+init_dst_sections (chan)
+    int chan;
+{
+
+  if (!init_one_section(chan, &blocks_info) ||
+      !init_one_section(chan, &lines_info) ||
+      !init_one_section(chan, &symbols_info))
+    return -1;
+  else
+    return 0;
+}
+
+/* Fake up support for relocating symbol addresses.  FIXME.  */
+
+struct section_offsets dst_symfile_faker = {0};
+
+struct section_offsets *
+dst_symfile_offsets (objfile, addr)
+     struct objfile *objfile;
+     CORE_ADDR addr;
+{
+  objfile->num_sections = 1;
+  return &dst_symfile_faker;
+}
+
+/* Register our ability to parse symbols for DST BFD files */
+
+static struct sym_fns dst_sym_fns =
+{
+  /* FIXME: Can this be integrated with coffread.c?  If not, should it be
+     a separate flavour like ecoff?  */
+  (enum bfd_flavour)-2,
+
+  dst_new_init,		/* sym_new_init: init anything gbl to entire symtab */
+  dst_symfile_init,	/* sym_init: read initial info, setup for sym_read() */
+  dst_symfile_read,	/* sym_read: read a symbol file into symtab */
+  dst_symfile_finish,	/* sym_finish: finished with file, cleanup */
+  dst_symfile_offsets, /* sym_offsets:  xlate external to internal form */
+  NULL			/* next: pointer to next struct sym_fns */
+};
+
+void
+_initialize_dstread ()
+{
+  add_symtab_fns(&dst_sym_fns);
+}