Add tracking of object files (that contain symbols) to gdb.

[binutils-gdb.git] / gdb / buildsym.c

/* Build symbol tables in GDB's internal format.
   Copyright (C) 1986-1991 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* This module provides subroutines used for creating and adding to
   the symbol table.  These routines are called from various symbol-
   file-reading routines.  

   They originated in dbxread.c of gdb-4.2, and were split out to
   make xcoffread.c more maintainable by sharing code.  */

#include "defs.h"
#include "param.h"
#include "obstack.h"
#include "symtab.h"
#include "breakpoint.h"
#include "gdbcore.h"            /* for bfd stuff for symfile.h */
#include "symfile.h"            /* Needed for "struct complaint" */
#include "stab.gnu.h"           /* We always use GNU stabs, not native */
#include <stdio.h>
#include <string.h>
#include <ctype.h>

/* Ask buildsym.h to define the vars it normally declares `extern'.  */
#define EXTERN  /**/
#include "buildsym.h"           /* Our own declarations */
#undef  EXTERN

extern void qsort ();
extern double atof ();

/* Things we export from outside, and probably shouldn't.  FIXME.  */
extern void new_object_header_files ();
extern char *next_symbol_text ();
extern int hashname ();
extern void patch_block_stabs ();       /* AIX xcoffread.c */
extern struct type *builtin_type ();    /* AIX xcoffread.c */
\f

static void cleanup_undefined_types ();
static void fix_common_block ();

static const char vptr_name[] = { '_','v','p','t','r',CPLUS_MARKER,'\0' };
static const char vb_name[] =   { '_','v','b',CPLUS_MARKER,'\0' };

/* Define this as 1 if a pcc declaration of a char or short argument
   gives the correct address.  Otherwise assume pcc gives the
   address of the corresponding int, which is not the same on a
   big-endian machine.  */

#ifndef BELIEVE_PCC_PROMOTION
#define BELIEVE_PCC_PROMOTION 0
#endif

/* Make a list of forward references which haven't been defined.  */
static struct type **undef_types;
static int undef_types_allocated, undef_types_length;

/* Initial sizes of data structures.  These are realloc'd larger if needed,
   and realloc'd down to the size actually used, when completed.  */

#define INITIAL_CONTEXT_STACK_SIZE      10
#define INITIAL_TYPE_VECTOR_LENGTH      160
#define INITIAL_LINE_VECTOR_LENGTH      1000
\f
/* Complaints about the symbols we have encountered.  */

struct complaint innerblock_complaint =
  {"inner block not inside outer block in %s", 0, 0};

struct complaint blockvector_complaint = 
  {"block at %x out of order", 0, 0};

#if 0
struct complaint dbx_class_complaint =
  {"encountered DBX-style class variable debugging information.\n\
You seem to have compiled your program with \
\"g++ -g0\" instead of \"g++ -g\".\n\
Therefore GDB will not know about your class variables", 0, 0};
#endif

struct complaint const_vol_complaint =
  {"const/volatile indicator missing (ok if using g++ v1.x), got '%c'", 0, 0};

struct complaint error_type_complaint =
  {"debug info mismatch between compiler and debugger", 0, 0};

struct complaint invalid_member_complaint =
  {"invalid (minimal) member type data format at symtab pos %d.", 0, 0};

struct complaint range_type_base_complaint =
  {"base type %d of range type is not defined", 0, 0};
\f
/* Look up a dbx type-number pair.  Return the address of the slot
   where the type for that number-pair is stored.
   The number-pair is in TYPENUMS.

   This can be used for finding the type associated with that pair
   or for associating a new type with the pair.  */

struct type **
dbx_lookup_type (typenums)
     int typenums[2];
{
  register int filenum = typenums[0], index = typenums[1];
  unsigned old_len;

  if (filenum < 0 || filenum >= n_this_object_header_files)
    error ("Invalid symbol data: type number (%d,%d) out of range at symtab pos %d.",
           filenum, index, symnum);

  if (filenum == 0)
    {
      /* Type is defined outside of header files.
         Find it in this object file's type vector.  */
      if (index >= type_vector_length)
        {
          old_len = type_vector_length;
          if (old_len == 0) {
            type_vector_length = INITIAL_TYPE_VECTOR_LENGTH;
            type_vector = (struct type **)
              malloc (type_vector_length * sizeof (struct type *));
          }
          while (index >= type_vector_length)
            type_vector_length *= 2;
          type_vector = (struct type **)
            xrealloc (type_vector,
                      (type_vector_length * sizeof (struct type *)));
          bzero (&type_vector[old_len],
                 (type_vector_length - old_len) * sizeof (struct type *));
        }
      return &type_vector[index];
    }
  else
    {
      register int real_filenum = this_object_header_files[filenum];
      register struct header_file *f;
      int f_orig_length;

      if (real_filenum >= n_header_files)
        abort ();

      f = &header_files[real_filenum];

      f_orig_length = f->length;
      if (index >= f_orig_length)
        {
          while (index >= f->length)
            f->length *= 2;
          f->vector = (struct type **)
            xrealloc (f->vector, f->length * sizeof (struct type *));
          bzero (&f->vector[f_orig_length],
                 (f->length - f_orig_length) * sizeof (struct type *));
        }
      return &f->vector[index];
    }
}

/* Create a type object.  Occaisionally used when you need a type
   which isn't going to be given a type number.  */

struct type *
dbx_create_type ()
{
  register struct type *type =
    (struct type *) obstack_alloc (symbol_obstack, sizeof (struct type));

  bzero (type, sizeof (struct type));
  TYPE_VPTR_FIELDNO (type) = -1;
  TYPE_VPTR_BASETYPE (type) = 0;
  return type;
}

/* Make sure there is a type allocated for type numbers TYPENUMS
   and return the type object.
   This can create an empty (zeroed) type object.
   TYPENUMS may be (-1, -1) to return a new type object that is not
   put into the type vector, and so may not be referred to by number. */

struct type *
dbx_alloc_type (typenums)
     int typenums[2];
{
  register struct type **type_addr;
  register struct type *type;

  if (typenums[0] != -1)
    {
      type_addr = dbx_lookup_type (typenums);
      type = *type_addr;
    }
  else
    {
      type_addr = 0;
      type = 0;
    }

  /* If we are referring to a type not known at all yet,
     allocate an empty type for it.
     We will fill it in later if we find out how.  */
  if (type == 0)
    {
      type = dbx_create_type ();
      if (type_addr)
        *type_addr = type;
    }
  
  return type;
}
\f
/* maintain the lists of symbols and blocks */

/* Add a symbol to one of the lists of symbols.  */
void
add_symbol_to_list (symbol, listhead)
     struct symbol *symbol;
     struct pending **listhead;
{
  /* We keep PENDINGSIZE symbols in each link of the list.
     If we don't have a link with room in it, add a new link.  */
  if (*listhead == 0 || (*listhead)->nsyms == PENDINGSIZE)
    {
      register struct pending *link;
      if (free_pendings)
        {
          link = free_pendings;
          free_pendings = link->next;
        }
      else
        link = (struct pending *) xmalloc (sizeof (struct pending));

      link->next = *listhead;
      *listhead = link;
      link->nsyms = 0;
    }

  (*listhead)->symbol[(*listhead)->nsyms++] = symbol;
}

/* Find a symbol on a pending list.  */
struct symbol *
find_symbol_in_list (list, name, length)
     struct pending *list;
     char *name;
     int length;
{
  int j;

  while (list) {
    for (j = list->nsyms; --j >= 0; ) {
      char *pp = SYMBOL_NAME (list->symbol[j]);
      if (*pp == *name && strncmp (pp, name, length) == 0 && pp[length] == '\0')
        return list->symbol[j];
    }
    list = list->next;
  }
  return NULL;
}

/* At end of reading syms, or in case of quit,
   really free as many `struct pending's as we can easily find.  */

/* ARGSUSED */
void
really_free_pendings (foo)
     int foo;
{
  struct pending *next, *next1;
#if 0
  struct pending_block *bnext, *bnext1;
#endif

  for (next = free_pendings; next; next = next1)
    {
      next1 = next->next;
      free (next);
    }
  free_pendings = 0;

#if 0 /* Now we make the links in the symbol_obstack, so don't free them.  */
  for (bnext = pending_blocks; bnext; bnext = bnext1)
    {
      bnext1 = bnext->next;
      free (bnext);
    }
#endif
  pending_blocks = 0;

  for (next = file_symbols; next; next = next1)
    {
      next1 = next->next;
      free (next);
    }
  file_symbols = 0;

  for (next = global_symbols; next; next = next1)
    {
      next1 = next->next;
      free (next);
    }
  global_symbols = 0;
}

/* Take one of the lists of symbols and make a block from it.
   Keep the order the symbols have in the list (reversed from the input file).
   Put the block on the list of pending blocks.  */

void
finish_block (symbol, listhead, old_blocks, start, end)
     struct symbol *symbol;
     struct pending **listhead;
     struct pending_block *old_blocks;
     CORE_ADDR start, end;
{
  register struct pending *next, *next1;
  register struct block *block;
  register struct pending_block *pblock;
  struct pending_block *opblock;
  register int i;

  /* Count the length of the list of symbols.  */

  for (next = *listhead, i = 0;
       next;
       i += next->nsyms, next = next->next)
    /*EMPTY*/;

  block = (struct block *) obstack_alloc (symbol_obstack,
          (sizeof (struct block) + ((i - 1) * sizeof (struct symbol *))));

  /* Copy the symbols into the block.  */

  BLOCK_NSYMS (block) = i;
  for (next = *listhead; next; next = next->next)
    {
      register int j;
      for (j = next->nsyms - 1; j >= 0; j--)
        BLOCK_SYM (block, --i) = next->symbol[j];
    }

  BLOCK_START (block) = start;
  BLOCK_END (block) = end;
  BLOCK_SUPERBLOCK (block) = 0; /* Filled in when containing block is made */
  BLOCK_GCC_COMPILED (block) = processing_gcc_compilation;

  /* Put the block in as the value of the symbol that names it.  */

  if (symbol)
    {
      SYMBOL_BLOCK_VALUE (symbol) = block;
      BLOCK_FUNCTION (block) = symbol;
    }
  else
    BLOCK_FUNCTION (block) = 0;

  /* Now "free" the links of the list, and empty the list.  */

  for (next = *listhead; next; next = next1)
    {
      next1 = next->next;
      next->next = free_pendings;
      free_pendings = next;
    }
  *listhead = 0;

  /* Install this block as the superblock
     of all blocks made since the start of this scope
     that don't have superblocks yet.  */

  opblock = 0;
  for (pblock = pending_blocks; pblock != old_blocks; pblock = pblock->next)
    {
      if (BLOCK_SUPERBLOCK (pblock->block) == 0) {
#if 1
        /* Check to be sure the blocks are nested as we receive them. 
           If the compiler/assembler/linker work, this just burns a small
           amount of time.  */
        if (BLOCK_START (pblock->block) < BLOCK_START (block)
         || BLOCK_END   (pblock->block) > BLOCK_END   (block)) {
          complain(&innerblock_complaint, symbol? SYMBOL_NAME (symbol):
                                                 "(don't know)");
          BLOCK_START (pblock->block) = BLOCK_START (block);
          BLOCK_END   (pblock->block) = BLOCK_END   (block);
        }
#endif
        BLOCK_SUPERBLOCK (pblock->block) = block;
      }
      opblock = pblock;
    }

  /* Record this block on the list of all blocks in the file.
     Put it after opblock, or at the beginning if opblock is 0.
     This puts the block in the list after all its subblocks.  */

  /* Allocate in the symbol_obstack to save time.
     It wastes a little space.  */
  pblock = (struct pending_block *)
    obstack_alloc (symbol_obstack,
                   sizeof (struct pending_block));
  pblock->block = block;
  if (opblock)
    {
      pblock->next = opblock->next;
      opblock->next = pblock;
    }
  else
    {
      pblock->next = pending_blocks;
      pending_blocks = pblock;
    }
}

struct blockvector *
make_blockvector ()
{
  register struct pending_block *next;
  register struct blockvector *blockvector;
  register int i;

  /* Count the length of the list of blocks.  */

  for (next = pending_blocks, i = 0; next; next = next->next, i++);

  blockvector = (struct blockvector *)
    obstack_alloc (symbol_obstack,
                   (sizeof (struct blockvector)
                    + (i - 1) * sizeof (struct block *)));

  /* Copy the blocks into the blockvector.
     This is done in reverse order, which happens to put
     the blocks into the proper order (ascending starting address).
     finish_block has hair to insert each block into the list
     after its subblocks in order to make sure this is true.  */

  BLOCKVECTOR_NBLOCKS (blockvector) = i;
  for (next = pending_blocks; next; next = next->next) {
    BLOCKVECTOR_BLOCK (blockvector, --i) = next->block;
  }

#if 0 /* Now we make the links in the obstack, so don't free them.  */
  /* Now free the links of the list, and empty the list.  */

  for (next = pending_blocks; next; next = next1)
    {
      next1 = next->next;
      free (next);
    }
#endif
  pending_blocks = 0;

#if 1  /* FIXME, shut this off after a while to speed up symbol reading.  */
  /* Some compilers output blocks in the wrong order, but we depend
     on their being in the right order so we can binary search. 
     Check the order and moan about it.  FIXME.  */
  if (BLOCKVECTOR_NBLOCKS (blockvector) > 1)
    for (i = 1; i < BLOCKVECTOR_NBLOCKS (blockvector); i++) {
      if (BLOCK_START(BLOCKVECTOR_BLOCK (blockvector, i-1))
          > BLOCK_START(BLOCKVECTOR_BLOCK (blockvector, i))) {
        complain (&blockvector_complaint, 
          BLOCK_START(BLOCKVECTOR_BLOCK (blockvector, i)));
      }
    }
#endif

  return blockvector;
}
\f
/* Start recording information about source code that came from an included
   (or otherwise merged-in) source file with a different name.  */

void
start_subfile (name, dirname)
     char *name;
     char *dirname;
{
  register struct subfile *subfile;

  /* See if this subfile is already known as a subfile of the
     current main source file.  */

  for (subfile = subfiles; subfile; subfile = subfile->next)
    {
      if (!strcmp (subfile->name, name))
        {
          current_subfile = subfile;
          return;
        }
    }

  /* This subfile is not known.  Add an entry for it.
     Make an entry for this subfile in the list of all subfiles
     of the current main source file.  */

  subfile = (struct subfile *) xmalloc (sizeof (struct subfile));
  subfile->next = subfiles;
  subfiles = subfile;
  current_subfile = subfile;

  /* Save its name and compilation directory name */
  subfile->name = obsavestring (name, strlen (name));
  if (dirname == NULL)
    subfile->dirname = NULL;
  else
    subfile->dirname = obsavestring (dirname, strlen (dirname));
  
  /* Initialize line-number recording for this subfile.  */
  subfile->line_vector = 0;
}
\f
/* Handle the N_BINCL and N_EINCL symbol types
   that act like N_SOL for switching source files
   (different subfiles, as we call them) within one object file,
   but using a stack rather than in an arbitrary order.  */

void
push_subfile ()
{
  register struct subfile_stack *tem
    = (struct subfile_stack *) xmalloc (sizeof (struct subfile_stack));

  tem->next = subfile_stack;
  subfile_stack = tem;
  if (current_subfile == 0 || current_subfile->name == 0)
    abort ();
  tem->name = current_subfile->name;
  tem->prev_index = header_file_prev_index;
}

char *
pop_subfile ()
{
  register char *name;
  register struct subfile_stack *link = subfile_stack;

  if (link == 0)
    abort ();

  name = link->name;
  subfile_stack = link->next;
  header_file_prev_index = link->prev_index;
  free (link);

  return name;
}
\f
/* Manage the vector of line numbers for each subfile.  */

void
record_line (subfile, line, pc)
     register struct subfile *subfile;
     int line;
     CORE_ADDR pc;
{
  struct linetable_entry *e;
  /* Ignore the dummy line number in libg.o */

  if (line == 0xffff)
    return;

  /* Make sure line vector exists and is big enough.  */
  if (!subfile->line_vector) {
    subfile->line_vector_length = INITIAL_LINE_VECTOR_LENGTH;
    subfile->line_vector = (struct linetable *)
        xmalloc (sizeof (struct linetable)
          + subfile->line_vector_length * sizeof (struct linetable_entry));
    subfile->line_vector->nitems = 0;
  }

  if (subfile->line_vector->nitems + 1 >= subfile->line_vector_length)
    {
      subfile->line_vector_length *= 2;
      subfile->line_vector = (struct linetable *)
        xrealloc (subfile->line_vector, (sizeof (struct linetable)
           + subfile->line_vector_length * sizeof (struct linetable_entry)));
    }

  e = subfile->line_vector->item + subfile->line_vector->nitems++;
  e->line = line; e->pc = pc;
}


/* Needed in order to sort line tables from IBM xcoff files.  Sigh!  */

/* static */
int
compare_line_numbers (ln1, ln2)
     struct linetable_entry *ln1, *ln2;
{
  return ln1->line - ln2->line;
}
\f
/* Start a new symtab for a new source file.
   This is called when a dbx symbol of type N_SO is seen;
   it indicates the start of data for one original source file.  */

void
start_symtab (name, dirname, start_addr)
     char *name;
     char *dirname;
     CORE_ADDR start_addr;
{

  last_source_file = name;
  last_source_start_addr = start_addr;
  file_symbols = 0;
  global_symbols = 0;
  global_stabs = 0;             /* AIX COFF */
  file_stabs = 0;               /* AIX COFF */
  within_function = 0;

  /* Context stack is initially empty.  Allocate first one with room for
     10 levels; reuse it forever afterward.  */
  if (context_stack == 0) {
    context_stack_size = INITIAL_CONTEXT_STACK_SIZE;
    context_stack = (struct context_stack *)
      xmalloc (context_stack_size * sizeof (struct context_stack));
  }
  context_stack_depth = 0;

  new_object_header_files ();

  type_vector_length = 0;
  type_vector = (struct type **) 0;

  /* Initialize the list of sub source files with one entry
     for this file (the top-level source file).  */

  subfiles = 0;
  current_subfile = 0;
  start_subfile (name, dirname);
}

/* 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.

   END_ADDR is the address of the end of the file's text.  */

struct symtab *
end_symtab (end_addr, sort_pending, sort_linevec, objfile)
     CORE_ADDR end_addr;
     int sort_pending;
     int sort_linevec;
     struct objfile *objfile;
{
  register struct symtab *symtab;
  register struct blockvector *blockvector;
  register struct subfile *subfile;
  struct subfile *nextsub;

  /* Finish the lexical context of the last function in the file;
     pop the context stack.  */

  if (context_stack_depth > 0)
    {
      register struct context_stack *cstk;
      context_stack_depth--;
      cstk = &context_stack[context_stack_depth];
      /* Make a block for the local symbols within.  */
      finish_block (cstk->name, &local_symbols, cstk->old_blocks,
                    cstk->start_addr, end_addr);

      /* Debug:  if context stack still has something in it, we are in
         trouble.  */
      if (context_stack_depth > 0)
        abort ();
    }

  /* It is unfortunate that in aixcoff, pending blocks might not be ordered
     in this stage. Especially, blocks for static functions will show up at
     the end.  We need to sort them, so tools like `find_pc_function' and
     `find_pc_block' can work reliably. */
  if (sort_pending && pending_blocks) {
    /* FIXME!  Remove this horrid bubble sort and use qsort!!! */
    int swapped;
    do {
      struct pending_block *pb, *pbnext;

      pb = pending_blocks, pbnext = pb->next;
      swapped = 0;

      while ( pbnext ) {

          /* swap blocks if unordered! */

          if (BLOCK_START(pb->block) < BLOCK_START(pbnext->block)) {
            struct block *tmp = pb->block;
            pb->block = pbnext->block;
            pbnext->block = tmp;
            swapped = 1;
          }
          pb = pbnext;
          pbnext = pbnext->next;
      }
    } while (swapped);
  }

  /* Cleanup any undefined types that have been left hanging around
     (this needs to be done before the finish_blocks so that
     file_symbols is still good).  */
  cleanup_undefined_types ();

  if (file_stabs) {
    patch_block_stabs (file_symbols, file_stabs);
    free (file_stabs);
    file_stabs = 0;
  }

  if (global_stabs) {
    patch_block_stabs (global_symbols, global_stabs);
    free (global_stabs);
    global_stabs = 0;
  }

  if (pending_blocks == 0
   && file_symbols == 0
   && global_symbols == 0) {
    /* Ignore symtabs that have no functions with real debugging info */
    blockvector = NULL;
  } else {
    /* Define the STATIC_BLOCK and GLOBAL_BLOCK, and build the blockvector.  */
    finish_block (0, &file_symbols, 0, last_source_start_addr, end_addr);
    finish_block (0, &global_symbols, 0, last_source_start_addr, end_addr);
    blockvector = make_blockvector ();
  }

  /* Now create the symtab objects proper, one for each subfile.  */
  /* (The main file is the last one on the chain.)  */

  for (subfile = subfiles; subfile; subfile = nextsub)
    {
      /* If we have blocks of symbols, make a symtab.
         Otherwise, just ignore this file and any line number info in it.  */
      symtab = 0;
      if (blockvector) {
        if (subfile->line_vector) {
          /* First, shrink the linetable to make more memory.  */
          subfile->line_vector = (struct linetable *)
            xrealloc (subfile->line_vector, (sizeof (struct linetable)
             + subfile->line_vector->nitems * sizeof (struct linetable_entry)));

          if (sort_linevec)
            qsort (subfile->line_vector->item, subfile->line_vector->nitems,
                   sizeof (struct linetable_entry), compare_line_numbers);
        }

        /* Now, allocate a symbol table.  */
        symtab = allocate_symtab (subfile->name, objfile);

        /* Fill in its components.  */
        symtab->blockvector = blockvector;
        symtab->linetable = subfile->line_vector;
        symtab->dirname = subfile->dirname;
        symtab->free_code = free_linetable;
        symtab->free_ptr = 0;

        /* Link the new symtab into the list of such.  */
        symtab->next = symtab_list;
        symtab_list = symtab;
      } else {
        /* No blocks for this file.  Delete any line number info we have
           for it.  */
        if (subfile->line_vector)
          free (subfile->line_vector);
      }

      nextsub = subfile->next;
      free (subfile);
    }

  if (type_vector)
    free ((char *) type_vector);
  type_vector = 0;
  type_vector_length = 0;

  last_source_file = 0;
  current_subfile = 0;

  return symtab;
}


/* Push a context block.  Args are an identifying nesting level (checkable
   when you pop it), and the starting PC address of this context.  */

struct context_stack *
push_context (desc, valu)
     int desc;
     CORE_ADDR valu;
{
  register struct context_stack *new;

  if (context_stack_depth == context_stack_size)
    {
      context_stack_size *= 2;
      context_stack = (struct context_stack *)
        xrealloc (context_stack,
                  (context_stack_size
                   * sizeof (struct context_stack)));
    }

  new = &context_stack[context_stack_depth++];
  new->depth = desc;
  new->locals = local_symbols;
  new->old_blocks = pending_blocks;
  new->start_addr = valu;
  new->name = 0;

  local_symbols = 0;

  return new;
}
\f
/* Initialize anything that needs initializing when starting to read
   a fresh piece of a symbol file, e.g. reading in the stuff corresponding
   to a psymtab.  */

void
buildsym_init ()
{
  free_pendings = 0;
  file_symbols = 0;
  global_symbols = 0;
  pending_blocks = 0;
}

/* Initialize anything that needs initializing when a completely new
   symbol file is specified (not just adding some symbols from another
   file, e.g. a shared library).  */

void
buildsym_new_init ()
{
  /* Empty the hash table of global syms looking for values.  */
  bzero (global_sym_chain, sizeof global_sym_chain);

  buildsym_init ();
}

/* Scan through all of the global symbols defined in the object file,
   assigning values to the debugging symbols that need to be assigned
   to.  Get these symbols from the misc function list.  */

void
scan_file_globals ()
{
  int hash;
  int mf;

  for (mf = 0; mf < misc_function_count; mf++)
    {
      char *namestring = misc_function_vector[mf].name;
      struct symbol *sym, *prev;

      QUIT;

      prev = (struct symbol *) 0;

      /* Get the hash index and check all the symbols
         under that hash index. */

      hash = hashname (namestring);

      for (sym = global_sym_chain[hash]; sym;)
        {
          if (*namestring == SYMBOL_NAME (sym)[0]
              && !strcmp(namestring + 1, SYMBOL_NAME (sym) + 1))
            {
              /* Splice this symbol out of the hash chain and
                 assign the value we have to it. */
              if (prev)
                SYMBOL_VALUE_CHAIN (prev) = SYMBOL_VALUE_CHAIN (sym);
              else
                global_sym_chain[hash] = SYMBOL_VALUE_CHAIN (sym);
              
              /* Check to see whether we need to fix up a common block.  */
              /* Note: this code might be executed several times for
                 the same symbol if there are multiple references.  */
              if (SYMBOL_CLASS (sym) == LOC_BLOCK)
                fix_common_block (sym, misc_function_vector[mf].address);
              else
                SYMBOL_VALUE_ADDRESS (sym) = misc_function_vector[mf].address;
              
              if (prev)
                sym = SYMBOL_VALUE_CHAIN (prev);
              else
                sym = global_sym_chain[hash];
            }
          else
            {
              prev = sym;
              sym = SYMBOL_VALUE_CHAIN (sym);
            }
        }
    }
}

\f
/* Read a number by which a type is referred to in dbx data,
   or perhaps read a pair (FILENUM, TYPENUM) in parentheses.
   Just a single number N is equivalent to (0,N).
   Return the two numbers by storing them in the vector TYPENUMS.
   TYPENUMS will then be used as an argument to dbx_lookup_type.  */

void
read_type_number (pp, typenums)
     register char **pp;
     register int *typenums;
{
  if (**pp == '(')
    {
      (*pp)++;
      typenums[0] = read_number (pp, ',');
      typenums[1] = read_number (pp, ')');
    }
  else
    {
      typenums[0] = 0;
      typenums[1] = read_number (pp, 0);
    }
}
\f
/* To handle GNU C++ typename abbreviation, we need to be able to
   fill in a type's name as soon as space for that type is allocated.
   `type_synonym_name' is the name of the type being allocated.
   It is cleared as soon as it is used (lest all allocated types
   get this name).  */
static char *type_synonym_name;

/* ARGSUSED */
struct symbol *
define_symbol (valu, string, desc, type)
     unsigned int valu;
     char *string;
     int desc;
     int type;
{
  register struct symbol *sym;
  char *p = (char *) strchr (string, ':');
  int deftype;
  int synonym = 0;
  register int i;

  /* Ignore syms with empty names.  */
  if (string[0] == 0)
    return 0;

  /* Ignore old-style symbols from cc -go  */
  if (p == 0)
    return 0;

  sym = (struct symbol *)obstack_alloc (symbol_obstack, sizeof (struct symbol));

  if (processing_gcc_compilation) {
    /* GCC 2.x puts the line number in desc.  SunOS apparently puts in the
       number of bytes occupied by a type or object, which we ignore.  */
    SYMBOL_LINE(sym) = desc;
  } else {
    SYMBOL_LINE(sym) = 0;                       /* unknown */
  }

  if (string[0] == CPLUS_MARKER)
    {
      /* Special GNU C++ names.  */
      switch (string[1])
        {
        case 't':
          SYMBOL_NAME (sym) = "this";
          break;
        case 'v': /* $vtbl_ptr_type */
          /* Was: SYMBOL_NAME (sym) = "vptr"; */
          goto normal;
        case 'e':
          SYMBOL_NAME (sym) = "eh_throw";
          break;

        case '_':
          /* This was an anonymous type that was never fixed up.  */
          goto normal;

        default:
          abort ();
        }
    }
  else
    {
    normal:
      SYMBOL_NAME (sym)
        = (char *) obstack_alloc (symbol_obstack, ((p - string) + 1));
      /* Open-coded bcopy--saves function call time.  */
      {
        register char *p1 = string;
        register char *p2 = SYMBOL_NAME (sym);
        while (p1 != p)
          *p2++ = *p1++;
        *p2++ = '\0';
      }
    }
  p++;
  /* Determine the type of name being defined.  */
  /* The Acorn RISC machine's compiler can put out locals that don't
     start with "234=" or "(3,4)=", so assume anything other than the
     deftypes we know how to handle is a local.  */
  /* (Peter Watkins @ Computervision)
     Handle Sun-style local fortran array types 'ar...' . 
     (gnu@cygnus.com) -- this strchr() handles them properly?
     (tiemann@cygnus.com) -- 'C' is for catch.  */
  if (!strchr ("cfFGpPrStTvVXC", *p))
    deftype = 'l';
  else
    deftype = *p++;

  /* c is a special case, not followed by a type-number.
     SYMBOL:c=iVALUE for an integer constant symbol.
     SYMBOL:c=rVALUE for a floating constant symbol.
     SYMBOL:c=eTYPE,INTVALUE for an enum constant symbol.
        e.g. "b:c=e6,0" for "const b = blob1"
        (where type 6 is defined by "blobs:t6=eblob1:0,blob2:1,;").  */
  if (deftype == 'c')
    {
      if (*p++ != '=')
        error ("Invalid symbol data at symtab pos %d.", symnum);
      switch (*p++)
        {
        case 'r':
          {
            double d = atof (p);
            char *dbl_valu;

            SYMBOL_TYPE (sym) = builtin_type_double;
            dbl_valu =
              (char *) obstack_alloc (symbol_obstack, sizeof (double));
            bcopy (&d, dbl_valu, sizeof (double));
            SWAP_TARGET_AND_HOST (dbl_valu, sizeof (double));
            SYMBOL_VALUE_BYTES (sym) = dbl_valu;
            SYMBOL_CLASS (sym) = LOC_CONST_BYTES;
          }
          break;
        case 'i':
          {
            SYMBOL_TYPE (sym) = builtin_type_int;
            SYMBOL_VALUE (sym) = atoi (p);
            SYMBOL_CLASS (sym) = LOC_CONST;
          }
          break;
        case 'e':
          /* SYMBOL:c=eTYPE,INTVALUE for an enum constant symbol.
             e.g. "b:c=e6,0" for "const b = blob1"
             (where type 6 is defined by "blobs:t6=eblob1:0,blob2:1,;").  */
          {
            int typenums[2];
            
            read_type_number (&p, typenums);
            if (*p++ != ',')
              error ("Invalid symbol data: no comma in enum const symbol");
            
            SYMBOL_TYPE (sym) = *dbx_lookup_type (typenums);
            SYMBOL_VALUE (sym) = atoi (p);
            SYMBOL_CLASS (sym) = LOC_CONST;
          }
          break;
        default:
          error ("Invalid symbol data at symtab pos %d.", symnum);
        }
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      add_symbol_to_list (sym, &file_symbols);
      return sym;
    }

  /* Now usually comes a number that says which data type,
     and possibly more stuff to define the type
     (all of which is handled by read_type)  */

  if (deftype == 'p' && *p == 'F')
    /* pF is a two-letter code that means a function parameter in Fortran.
       The type-number specifies the type of the return value.
       Translate it into a pointer-to-function type.  */
    {
      p++;
      SYMBOL_TYPE (sym)
        = lookup_pointer_type (lookup_function_type (read_type (&p)));
    }
  else
    {
      struct type *type_read;
      synonym = *p == 't';

      if (synonym)
        {
          p += 1;
          type_synonym_name = obsavestring (SYMBOL_NAME (sym),
                                            strlen (SYMBOL_NAME (sym)));
        }

      type_read = read_type (&p);

      if ((deftype == 'F' || deftype == 'f')
          && TYPE_CODE (type_read) != TYPE_CODE_FUNC)
      {
#if 0
/* This code doesn't work -- it needs to realloc and can't.  */
        struct type *new = (struct type *)
              obstack_alloc (symbol_obstack, sizeof (struct type));

        /* Generate a template for the type of this function.  The 
           types of the arguments will be added as we read the symbol 
           table. */
        *new = *lookup_function_type (type_read);
        SYMBOL_TYPE(sym) = new;
        in_function_type = new;
#else
        SYMBOL_TYPE (sym) = lookup_function_type (type_read);
#endif
      }
      else
        SYMBOL_TYPE (sym) = type_read;
    }

  switch (deftype)
    {
    case 'C':
      /* The name of a caught exception.  */
      SYMBOL_CLASS (sym) = LOC_LABEL;
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      SYMBOL_VALUE_ADDRESS (sym) = valu;
      add_symbol_to_list (sym, &local_symbols);
      break;

    case 'f':
      SYMBOL_CLASS (sym) = LOC_BLOCK;
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      add_symbol_to_list (sym, &file_symbols);
      break;

    case 'F':
      SYMBOL_CLASS (sym) = LOC_BLOCK;
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      add_symbol_to_list (sym, &global_symbols);
      break;

    case 'G':
      /* For a class G (global) symbol, it appears that the
         value is not correct.  It is necessary to search for the
         corresponding linker definition to find the value.
         These definitions appear at the end of the namelist.  */
      i = hashname (SYMBOL_NAME (sym));
      SYMBOL_VALUE_CHAIN (sym) = global_sym_chain[i];
      global_sym_chain[i] = sym;
      SYMBOL_CLASS (sym) = LOC_STATIC;
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      add_symbol_to_list (sym, &global_symbols);
      break;

      /* This case is faked by a conditional above,
         when there is no code letter in the dbx data.
         Dbx data never actually contains 'l'.  */
    case 'l':
      SYMBOL_CLASS (sym) = LOC_LOCAL;
      SYMBOL_VALUE (sym) = valu;
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      add_symbol_to_list (sym, &local_symbols);
      break;

    case 'p':
      /* Normally this is a parameter, a LOC_ARG.  On the i960, it
         can also be a LOC_LOCAL_ARG depending on symbol type.  */
#ifndef DBX_PARM_SYMBOL_CLASS
#define DBX_PARM_SYMBOL_CLASS(type)     LOC_ARG
#endif
      SYMBOL_CLASS (sym) = DBX_PARM_SYMBOL_CLASS (type);
      SYMBOL_VALUE (sym) = valu;
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
#if 0
      /* This doesn't work yet.  */
      add_param_to_type (&in_function_type, sym);
#endif
      add_symbol_to_list (sym, &local_symbols);

      /* If it's gcc-compiled, if it says `short', believe it.  */
      if (processing_gcc_compilation || BELIEVE_PCC_PROMOTION)
        break;

#if defined(BELIEVE_PCC_PROMOTION_TYPE)
      /* This macro is defined on machines (e.g. sparc) where
         we should believe the type of a PCC 'short' argument,
         but shouldn't believe the address (the address is
         the address of the corresponding int).  Note that
         this is only different from the BELIEVE_PCC_PROMOTION
         case on big-endian machines.

         My guess is that this correction, as opposed to changing
         the parameter to an 'int' (as done below, for PCC
         on most machines), is the right thing to do
         on all machines, but I don't want to risk breaking
         something that already works.  On most PCC machines,
         the sparc problem doesn't come up because the calling
         function has to zero the top bytes (not knowing whether
         the called function wants an int or a short), so there
         is no practical difference between an int and a short
         (except perhaps what happens when the GDB user types
         "print short_arg = 0x10000;"). 

         Hacked for SunOS 4.1 by gnu@cygnus.com.  In 4.1, the compiler
         actually produces the correct address (we don't need to fix it
         up).  I made this code adapt so that it will offset the symbol
         if it was pointing at an int-aligned location and not
         otherwise.  This way you can use the same gdb for 4.0.x and
         4.1 systems.  */

      if (0 == SYMBOL_VALUE (sym) % sizeof (int))
        {
          if (SYMBOL_TYPE (sym) == builtin_type_char
              || SYMBOL_TYPE (sym) == builtin_type_unsigned_char)
            SYMBOL_VALUE (sym) += 3;
          else if (SYMBOL_TYPE (sym) == builtin_type_short
              || SYMBOL_TYPE (sym) == builtin_type_unsigned_short)
            SYMBOL_VALUE (sym) += 2;
        }
      break;

#else /* no BELIEVE_PCC_PROMOTION_TYPE.  */

      /* If PCC says a parameter is a short or a char,
         it is really an int.  */
      if (SYMBOL_TYPE (sym) == builtin_type_char
          || SYMBOL_TYPE (sym) == builtin_type_short)
        SYMBOL_TYPE (sym) = builtin_type_int;
      else if (SYMBOL_TYPE (sym) == builtin_type_unsigned_char
               || SYMBOL_TYPE (sym) == builtin_type_unsigned_short)
        SYMBOL_TYPE (sym) = builtin_type_unsigned_int;
      break;

#endif /* no BELIEVE_PCC_PROMOTION_TYPE.  */

    case 'P':
      SYMBOL_CLASS (sym) = LOC_REGPARM;
      SYMBOL_VALUE (sym) = STAB_REG_TO_REGNUM (valu);
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      add_symbol_to_list (sym, &local_symbols);
      break;

    case 'r':
      SYMBOL_CLASS (sym) = LOC_REGISTER;
      SYMBOL_VALUE (sym) = STAB_REG_TO_REGNUM (valu);
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      add_symbol_to_list (sym, &local_symbols);
      break;

    case 'S':
      /* Static symbol at top level of file */
      SYMBOL_CLASS (sym) = LOC_STATIC;
      SYMBOL_VALUE_ADDRESS (sym) = valu;
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      add_symbol_to_list (sym, &file_symbols);
      break;

    case 't':
      SYMBOL_CLASS (sym) = LOC_TYPEDEF;
      SYMBOL_VALUE (sym) = valu;
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0
          && (TYPE_FLAGS (SYMBOL_TYPE (sym)) & TYPE_FLAG_PERM) == 0)
        TYPE_NAME (SYMBOL_TYPE (sym)) =
          obsavestring (SYMBOL_NAME (sym),
                        strlen (SYMBOL_NAME (sym)));
       /* C++ vagaries: we may have a type which is derived from
         a base type which did not have its name defined when the
         derived class was output.  We fill in the derived class's
         base part member's name here in that case.  */
       else if ((TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_STRUCT
                 || TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_UNION)
                && TYPE_N_BASECLASSES (SYMBOL_TYPE (sym)))
         {
           int j;
           for (j = TYPE_N_BASECLASSES (SYMBOL_TYPE (sym)) - 1; j >= 0; j--)
             if (TYPE_BASECLASS_NAME (SYMBOL_TYPE (sym), j) == 0)
               TYPE_BASECLASS_NAME (SYMBOL_TYPE (sym), j) =
                 type_name_no_tag (TYPE_BASECLASS (SYMBOL_TYPE (sym), j));
         }

      add_symbol_to_list (sym, &file_symbols);
      break;

    case 'T':
      SYMBOL_CLASS (sym) = LOC_TYPEDEF;
      SYMBOL_VALUE (sym) = valu;
      SYMBOL_NAMESPACE (sym) = STRUCT_NAMESPACE;
      if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0
          && (TYPE_FLAGS (SYMBOL_TYPE (sym)) & TYPE_FLAG_PERM) == 0)
        TYPE_NAME (SYMBOL_TYPE (sym))
          = obconcat ("",
                      (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_ENUM
                       ? "enum "
                       : (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_STRUCT
                          ? "struct " : "union ")),
                      SYMBOL_NAME (sym));
      add_symbol_to_list (sym, &file_symbols);

      if (synonym)
        {
          register struct symbol *typedef_sym
            = (struct symbol *) obstack_alloc (symbol_obstack, sizeof (struct symbol));
          SYMBOL_NAME (typedef_sym) = SYMBOL_NAME (sym);
          SYMBOL_TYPE (typedef_sym) = SYMBOL_TYPE (sym);

          SYMBOL_CLASS (typedef_sym) = LOC_TYPEDEF;
          SYMBOL_VALUE (typedef_sym) = valu;
          SYMBOL_NAMESPACE (typedef_sym) = VAR_NAMESPACE;
          add_symbol_to_list (typedef_sym, &file_symbols);
        }
      break;

    case 'V':
      /* Static symbol of local scope */
      SYMBOL_CLASS (sym) = LOC_STATIC;
      SYMBOL_VALUE_ADDRESS (sym) = valu;
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      add_symbol_to_list (sym, &local_symbols);
      break;

    case 'v':
      /* Reference parameter */
      SYMBOL_CLASS (sym) = LOC_REF_ARG;
      SYMBOL_VALUE (sym) = valu;
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      add_symbol_to_list (sym, &local_symbols);
      break;

    case 'X':
      /* This is used by Sun FORTRAN for "function result value".
         Sun claims ("dbx and dbxtool interfaces", 2nd ed)
         that Pascal uses it too, but when I tried it Pascal used
         "x:3" (local symbol) instead.  */
      SYMBOL_CLASS (sym) = LOC_LOCAL;
      SYMBOL_VALUE (sym) = valu;
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      add_symbol_to_list (sym, &local_symbols);
      break;

    default:
      error ("Invalid symbol data: unknown symbol-type code `%c' at symtab pos %d.", deftype, symnum);
    }
  return sym;
}
\f
/* What about types defined as forward references inside of a small lexical
   scope?  */
/* Add a type to the list of undefined types to be checked through
   once this file has been read in.  */
void
add_undefined_type (type)
     struct type *type;
{
  if (undef_types_length == undef_types_allocated)
    {
      undef_types_allocated *= 2;
      undef_types = (struct type **)
        xrealloc (undef_types,
                  undef_types_allocated * sizeof (struct type *));
    }
  undef_types[undef_types_length++] = type;
}

/* Add here something to go through each undefined type, see if it's
   still undefined, and do a full lookup if so.  */
static void
cleanup_undefined_types ()
{
  struct type **type;

  for (type = undef_types; type < undef_types + undef_types_length; type++)
    {
      /* Reasonable test to see if it's been defined since.  */
      if (TYPE_NFIELDS (*type) == 0)
        {
          struct pending *ppt;
          int i;
          /* Name of the type, without "struct" or "union" */
          char *typename = TYPE_NAME (*type);

          if (!strncmp (typename, "struct ", 7))
            typename += 7;
          if (!strncmp (typename, "union ", 6))
            typename += 6;

          for (ppt = file_symbols; ppt; ppt = ppt->next)
            for (i = 0; i < ppt->nsyms; i++)
              {
                struct symbol *sym = ppt->symbol[i];

                if (SYMBOL_CLASS (sym) == LOC_TYPEDEF
                    && SYMBOL_NAMESPACE (sym) == STRUCT_NAMESPACE
                    && (TYPE_CODE (SYMBOL_TYPE (sym)) ==
                        TYPE_CODE (*type))
                    && !strcmp (SYMBOL_NAME (sym), typename))
                  bcopy (SYMBOL_TYPE (sym), *type, sizeof (struct type));
              }
        }
      else
        /* It has been defined; don't mark it as a stub.  */
        TYPE_FLAGS (*type) &= ~TYPE_FLAG_STUB;
    }
  undef_types_length = 0;
}
\f
/* Skip rest of this symbol and return an error type.

   General notes on error recovery:  error_type always skips to the
   end of the symbol (modulo cretinous dbx symbol name continuation).
   Thus code like this:

   if (*(*pp)++ != ';')
     return error_type (pp);

   is wrong because if *pp starts out pointing at '\0' (typically as the
   result of an earlier error), it will be incremented to point to the
   start of the next symbol, which might produce strange results, at least
   if you run off the end of the string table.  Instead use

   if (**pp != ';')
     return error_type (pp);
   ++*pp;

   or

   if (**pp != ';')
     foo = error_type (pp);
   else
     ++*pp;

   And in case it isn't obvious, the point of all this hair is so the compiler
   can define new types and new syntaxes, and old versions of the
   debugger will be able to read the new symbol tables.  */

struct type *
error_type (pp)
     char **pp;
{
  complain (&error_type_complaint, 0);
  while (1)
    {
      /* Skip to end of symbol.  */
      while (**pp != '\0')
        (*pp)++;

      /* Check for and handle cretinous dbx symbol name continuation!  */
      if ((*pp)[-1] == '\\')
        *pp = next_symbol_text ();
      else
        break;
    }
  return builtin_type_error;
}
\f
/* Read a dbx type reference or definition;
   return the type that is meant.
   This can be just a number, in which case it references
   a type already defined and placed in type_vector.
   Or the number can be followed by an =, in which case
   it means to define a new type according to the text that
   follows the =.  */

struct type *
read_type (pp)
     register char **pp;
{
  register struct type *type = 0;
  struct type *type1;
  int typenums[2];
  int xtypenums[2];

  /* Read type number if present.  The type number may be omitted.
     for instance in a two-dimensional array declared with type
     "ar1;1;10;ar1;1;10;4".  */
  if ((**pp >= '0' && **pp <= '9')
      || **pp == '(')
    {
      read_type_number (pp, typenums);
      
      /* Type is not being defined here.  Either it already exists,
         or this is a forward reference to it.  dbx_alloc_type handles
         both cases.  */
      if (**pp != '=')
        return dbx_alloc_type (typenums);

      /* Type is being defined here.  */
#if 0 /* Callers aren't prepared for a NULL result!  FIXME -- metin!  */
      {
        struct type *tt;

        /* if such a type already exists, this is an unnecessary duplication
           of the stab string, which is common in (RS/6000) xlc generated
           objects.  In that case, simply return NULL and let the caller take
           care of it. */

        tt = *dbx_lookup_type (typenums);
        if (tt && tt->length && tt->code)
          return NULL;
      }
#endif

      *pp += 2;
    }
  else
    {
      /* 'typenums=' not present, type is anonymous.  Read and return
         the definition, but don't put it in the type vector.  */
      typenums[0] = typenums[1] = -1;
      *pp += 1;
    }

  switch ((*pp)[-1])
    {
    case 'x':
      {
        enum type_code code;

        /* Used to index through file_symbols.  */
        struct pending *ppt;
        int i;
        
        /* Name including "struct", etc.  */
        char *type_name;
        
        /* Name without "struct", etc.  */
        char *type_name_only;

        {
          char *prefix;
          char *from, *to;
          
          /* Set the type code according to the following letter.  */
          switch ((*pp)[0])
            {
            case 's':
              code = TYPE_CODE_STRUCT;
              prefix = "struct ";
              break;
            case 'u':
              code = TYPE_CODE_UNION;
              prefix = "union ";
              break;
            case 'e':
              code = TYPE_CODE_ENUM;
              prefix = "enum ";
              break;
            default:
              return error_type (pp);
            }
          
          to = type_name = (char *)
            obstack_alloc (symbol_obstack,
                           (strlen (prefix) +
                            ((char *) strchr (*pp, ':') - (*pp)) + 1));
        
          /* Copy the prefix.  */
          from = prefix;
          while (*to++ = *from++)
            ;
          to--; 
        
          type_name_only = to;

          /* Copy the name.  */
          from = *pp + 1;
          while ((*to++ = *from++) != ':')
            ;
          *--to = '\0';
          
          /* Set the pointer ahead of the name which we just read.  */
          *pp = from;
        
#if 0
          /* The following hack is clearly wrong, because it doesn't
             check whether we are in a baseclass.  I tried to reproduce
             the case that it is trying to fix, but I couldn't get
             g++ to put out a cross reference to a basetype.  Perhaps
             it doesn't do it anymore.  */
          /* Note: for C++, the cross reference may be to a base type which
             has not yet been seen.  In this case, we skip to the comma,
             which will mark the end of the base class name.  (The ':'
             at the end of the base class name will be skipped as well.)
             But sometimes (ie. when the cross ref is the last thing on
             the line) there will be no ','.  */
          from = (char *) strchr (*pp, ',');
          if (from)
            *pp = from;
#endif /* 0 */
        }

        /* Now check to see whether the type has already been declared.  */
        /* This is necessary at least in the case where the
           program says something like
             struct foo bar[5];
           The compiler puts out a cross-reference; we better find
           set the length of the structure correctly so we can
           set the length of the array.  */
        for (ppt = file_symbols; ppt; ppt = ppt->next)
          for (i = 0; i < ppt->nsyms; i++)
            {
              struct symbol *sym = ppt->symbol[i];

              if (SYMBOL_CLASS (sym) == LOC_TYPEDEF
                  && SYMBOL_NAMESPACE (sym) == STRUCT_NAMESPACE
                  && (TYPE_CODE (SYMBOL_TYPE (sym)) == code)
                  && !strcmp (SYMBOL_NAME (sym), type_name_only))
                {
                  obstack_free (symbol_obstack, type_name);
                  type = SYMBOL_TYPE (sym);
                  return type;
                }
            }
        
        /* Didn't find the type to which this refers, so we must
           be dealing with a forward reference.  Allocate a type
           structure for it, and keep track of it so we can
           fill in the rest of the fields when we get the full
           type.  */
        type = dbx_alloc_type (typenums);
        TYPE_CODE (type) = code;
        TYPE_NAME (type) = type_name;

        TYPE_FLAGS (type) |= TYPE_FLAG_STUB;

        add_undefined_type (type);
        return type;
      }

    case '0':
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
    case '6':
    case '7':
    case '8':
    case '9':
    case '(':
      (*pp)--;
      read_type_number (pp, xtypenums);
      type = *dbx_lookup_type (xtypenums);
      /* fall through */

    after_digits:
      if (type == 0)
        type = builtin_type_void;
      if (typenums[0] != -1)
        *dbx_lookup_type (typenums) = type;
      break;

    case '*':
      type1 = read_type (pp);
/* FIXME -- we should be doing smash_to_XXX types here.  */
#if 0
    /* postponed type decoration should be allowed. */
    if (typenums[1] > 0 && typenums[1] < type_vector_length &&
        (type = type_vector[typenums[1]])) {
      smash_to_pointer_type (type, type1);
      break;
    }
#endif
      type = lookup_pointer_type (type1);
      if (typenums[0] != -1)
        *dbx_lookup_type (typenums) = type;
      break;

    case '@':
      {
        struct type *domain = read_type (pp);
        struct type *memtype;

        if (**pp != ',')
          /* Invalid member type data format.  */
          return error_type (pp);
        ++*pp;

        memtype = read_type (pp);
        type = dbx_alloc_type (typenums);
        smash_to_member_type (type, domain, memtype);
      }
      break;

    case '#':
      if ((*pp)[0] == '#')
        {
          /* We'll get the parameter types from the name.  */
          struct type *return_type;

          *pp += 1;
          return_type = read_type (pp);
          if (*(*pp)++ != ';')
            complain (&invalid_member_complaint, symnum);
          type = allocate_stub_method (return_type);
          if (typenums[0] != -1)
            *dbx_lookup_type (typenums) = type;
        }
      else
        {
          struct type *domain = read_type (pp);
          struct type *return_type;
          struct type **args;

          if (*(*pp)++ != ',')
            error ("invalid member type data format, at symtab pos %d.",
                   symnum);

          return_type = read_type (pp);
          args = read_args (pp, ';');
          type = dbx_alloc_type (typenums);
          smash_to_method_type (type, domain, return_type, args);
        }
      break;

    case '&':
      type1 = read_type (pp);
      type = lookup_reference_type (type1);
      if (typenums[0] != -1)
        *dbx_lookup_type (typenums) = type;
      break;

    case 'f':
      type1 = read_type (pp);
      type = lookup_function_type (type1);
      if (typenums[0] != -1)
        *dbx_lookup_type (typenums) = type;
      break;

    case 'r':
      type = read_range_type (pp, typenums);
      if (typenums[0] != -1)
        *dbx_lookup_type (typenums) = type;
      break;

    case 'e':
      type = dbx_alloc_type (typenums);
      type = read_enum_type (pp, type);
      *dbx_lookup_type (typenums) = type;
      break;

    case 's':
      type = dbx_alloc_type (typenums);
      TYPE_NAME (type) = type_synonym_name;
      type_synonym_name = 0;
      type = read_struct_type (pp, type);
      break;

    case 'u':
      type = dbx_alloc_type (typenums);
      TYPE_NAME (type) = type_synonym_name;
      type_synonym_name = 0;
      type = read_struct_type (pp, type);
      TYPE_CODE (type) = TYPE_CODE_UNION;
      break;

    case 'a':
      if (**pp != 'r')
        return error_type (pp);
      ++*pp;
      
      type = dbx_alloc_type (typenums);
      type = read_array_type (pp, type);
      break;

    default:
      --*pp;                    /* Go back to the symbol in error */
                                /* Particularly important if it was \0! */
      return error_type (pp);
    }

  if (type == 0)
    abort ();

#if 0
  /* If this is an overriding temporary alteration for a header file's
     contents, and this type number is unknown in the global definition,
     put this type into the global definition at this type number.  */
  if (header_file_prev_index >= 0)
    {
      register struct type **tp
        = explicit_lookup_type (header_file_prev_index, typenums[1]);
      if (*tp == 0)
        *tp = type;
    }
#endif
  return type;
}
\f
/* This page contains subroutines of read_type.  */

/* Read the description of a structure (or union type)
   and return an object describing the type.  */

struct type *
read_struct_type (pp, type)
     char **pp;
     register struct type *type;
{
  /* Total number of methods defined in this class.
     If the class defines two `f' methods, and one `g' method,
     then this will have the value 3.  */
  int total_length = 0;

  struct nextfield
    {
      struct nextfield *next;
      int visibility;                   /* 0=public, 1=protected, 2=public */
      struct field field;
    };

  struct next_fnfield
    {
      struct next_fnfield *next;
      int visibility;                   /* 0=public, 1=protected, 2=public */
      struct fn_field fn_field;
    };

  struct next_fnfieldlist
    {
      struct next_fnfieldlist *next;
      struct fn_fieldlist fn_fieldlist;
    };

  register struct nextfield *list = 0;
  struct nextfield *new;
  register char *p;
  int nfields = 0;
  register int n;

  register struct next_fnfieldlist *mainlist = 0;
  int nfn_fields = 0;

  if (TYPE_MAIN_VARIANT (type) == 0)
    {
      TYPE_MAIN_VARIANT (type) = type;
    }

  TYPE_CODE (type) = TYPE_CODE_STRUCT;

  /* First comes the total size in bytes.  */

  TYPE_LENGTH (type) = read_number (pp, 0);

  /* C++: Now, if the class is a derived class, then the next character
     will be a '!', followed by the number of base classes derived from.
     Each element in the list contains visibility information,
     the offset of this base class in the derived structure,
     and then the base type. */
  if (**pp == '!')
    {
      int i, n_baseclasses, offset;
      struct type *baseclass;
      int via_public;

      /* Nonzero if it is a virtual baseclass, i.e.,

         struct A{};
         struct B{};
         struct C : public B, public virtual A {};

         B is a baseclass of C; A is a virtual baseclass for C.  This is a C++
         2.0 language feature.  */
      int via_virtual;

      *pp += 1;

      n_baseclasses = read_number (pp, ',');
      TYPE_FIELD_VIRTUAL_BITS (type) =
          (B_TYPE *) obstack_alloc (symbol_obstack, B_BYTES (n_baseclasses));
      B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), n_baseclasses);

      for (i = 0; i < n_baseclasses; i++)
        {
          if (**pp == '\\')
            *pp = next_symbol_text ();

          switch (**pp)
            {
            case '0':
              via_virtual = 0;
              break;
            case '1':
              via_virtual = 1;
              break;
            default:
              /* Bad visibility format.  */
              return error_type (pp);
            }
          ++*pp;

          switch (**pp)
            {
            case '0':
              via_public = 0;
              break;
            case '2':
              via_public = 2;
              break;
            default:
              /* Bad visibility format.  */
              return error_type (pp);
            }
          if (via_virtual) 
            SET_TYPE_FIELD_VIRTUAL (type, i);
          ++*pp;

          /* Offset of the portion of the object corresponding to
             this baseclass.  Always zero in the absence of
             multiple inheritance.  */
          offset = read_number (pp, ',');
          baseclass = read_type (pp);
          *pp += 1;             /* skip trailing ';' */

          /* Make this baseclass visible for structure-printing purposes.  */
          new = (struct nextfield *) alloca (sizeof (struct nextfield));
          new->next = list;
          list = new;
          list->visibility = via_public;
          list->field.type = baseclass;
          list->field.name = type_name_no_tag (baseclass);
          list->field.bitpos = offset;
          list->field.bitsize = 0;      /* this should be an unpacked field! */
          nfields++;
        }
      TYPE_N_BASECLASSES (type) = n_baseclasses;
    }

  /* Now come the fields, as NAME:?TYPENUM,BITPOS,BITSIZE; for each one.
     At the end, we see a semicolon instead of a field.

     In C++, this may wind up being NAME:?TYPENUM:PHYSNAME; for
     a static field.

     The `?' is a placeholder for one of '/2' (public visibility),
     '/1' (protected visibility), '/0' (private visibility), or nothing
     (C style symbol table, public visibility).  */

  /* We better set p right now, in case there are no fields at all...    */
  p = *pp;

  while (**pp != ';')
    {
      /* Check for and handle cretinous dbx symbol name continuation!  */
      if (**pp == '\\') *pp = next_symbol_text ();

      /* Get space to record the next field's data.  */
      new = (struct nextfield *) alloca (sizeof (struct nextfield));
      new->next = list;
      list = new;

      /* Get the field name.  */
      p = *pp;
      if (*p == CPLUS_MARKER)
        {
          /* Special GNU C++ name.  */
          if (*++p == 'v')
            {
              const char *prefix;
              char *name = 0;
              struct type *context;

              switch (*++p)
                {
                case 'f':
                  prefix = vptr_name;
                  break;
                case 'b':
                  prefix = vb_name;
                  break;
                default:
                  error ("invalid abbreviation at symtab pos %d.", symnum);
                }
              *pp = p + 1;
              context = read_type (pp);
              name = type_name_no_tag (context);
              if (name == 0)
                {
                  error ("type name unknown at symtab pos %d.", symnum);
                  TYPE_NAME (context) = name;
                }
              list->field.name = obconcat (prefix, name, "");
              p = ++(*pp);
              if (p[-1] != ':')
                error ("invalid abbreviation at symtab pos %d.", symnum);
              list->field.type = read_type (pp);
              (*pp)++;                  /* Skip the comma.  */
              list->field.bitpos = read_number (pp, ';');
              /* This field is unpacked.  */
              list->field.bitsize = 0;
            }
          /* GNU C++ anonymous type.  */
          else if (*p == '_')
            break;
          else
            error ("invalid abbreviation at symtab pos %d.", symnum);

          nfields++;
          continue;
        }

      while (*p != ':') p++;
      list->field.name = obsavestring (*pp, p - *pp);

      /* C++: Check to see if we have hit the methods yet.  */
      if (p[1] == ':')
        break;

      *pp = p + 1;

      /* This means we have a visibility for a field coming. */
      if (**pp == '/')
        {
          switch (*++*pp)
            {
            case '0':
              list->visibility = 0;     /* private */
              *pp += 1;
              break;

            case '1':
              list->visibility = 1;     /* protected */
              *pp += 1;
              break;

            case '2':
              list->visibility = 2;     /* public */
              *pp += 1;
              break;
            }
        }
       else /* normal dbx-style format.  */
        list->visibility = 2;           /* public */

      list->field.type = read_type (pp);
      if (**pp == ':')
        {
          /* Static class member.  */
          list->field.bitpos = (long)-1;
          p = ++(*pp);
          while (*p != ';') p++;
          list->field.bitsize = (long) savestring (*pp, p - *pp);
          *pp = p + 1;
          nfields++;
          continue;
        }
       else if (**pp != ',')
         /* Bad structure-type format.  */
         return error_type (pp);

      (*pp)++;                  /* Skip the comma.  */
      list->field.bitpos = read_number (pp, ',');
      list->field.bitsize = read_number (pp, ';');

#if 0
      /* FIXME-tiemann: Can't the compiler put out something which
         lets us distinguish these? (or maybe just not put out anything
         for the field).  What is the story here?  What does the compiler
        really do?  Also, patch gdb.texinfo for this case; I document
        it as a possible problem there.  Search for "DBX-style".  */

      /* This is wrong because this is identical to the symbols
         produced for GCC 0-size arrays.  For example:
         typedef union {
           int num;
           char str[0];
         } foo;
         The code which dumped core in such circumstances should be
         fixed not to dump core.  */

      /* g++ -g0 can put out bitpos & bitsize zero for a static
         field.  This does not give us any way of getting its
         class, so we can't know its name.  But we can just
         ignore the field so we don't dump core and other nasty
         stuff.  */
      if (list->field.bitpos == 0
          && list->field.bitsize == 0)
        {
          complain (&dbx_class_complaint, 0);
          /* Ignore this field.  */
          list = list->next;
        }
      else
#endif /* 0 */
        {
          /* Detect an unpacked field and mark it as such.
             dbx gives a bit size for all fields.
             Note that forward refs cannot be packed,
             and treat enums as if they had the width of ints.  */
          if (TYPE_CODE (list->field.type) != TYPE_CODE_INT
              && TYPE_CODE (list->field.type) != TYPE_CODE_ENUM)
            list->field.bitsize = 0;
          if ((list->field.bitsize == 8 * TYPE_LENGTH (list->field.type)
               || (TYPE_CODE (list->field.type) == TYPE_CODE_ENUM
                   && (list->field.bitsize
                       == 8 * TYPE_LENGTH (builtin_type_int))
                   )
               )
              &&
              list->field.bitpos % 8 == 0)
            list->field.bitsize = 0;
          nfields++;
        }
    }

  if (p[1] == ':')
    /* chill the list of fields: the last entry (at the head)
       is a partially constructed entry which we now scrub.  */
    list = list->next;

  /* Now create the vector of fields, and record how big it is.
     We need this info to record proper virtual function table information
     for this class's virtual functions.  */

  TYPE_NFIELDS (type) = nfields;
  TYPE_FIELDS (type) = (struct field *) obstack_alloc (symbol_obstack,
                                               sizeof (struct field) * nfields);

  TYPE_FIELD_PRIVATE_BITS (type) =
    (B_TYPE *) obstack_alloc (symbol_obstack, B_BYTES (nfields));
  B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);

  TYPE_FIELD_PROTECTED_BITS (type) =
    (B_TYPE *) obstack_alloc (symbol_obstack, B_BYTES (nfields));
  B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);

  /* Copy the saved-up fields into the field vector.  */

  for (n = nfields; list; list = list->next)
    {
      n -= 1;
      TYPE_FIELD (type, n) = list->field;
      if (list->visibility == 0)
        SET_TYPE_FIELD_PRIVATE (type, n);
      else if (list->visibility == 1)
        SET_TYPE_FIELD_PROTECTED (type, n);
    }

  /* Now come the method fields, as NAME::methods
     where each method is of the form TYPENUM,ARGS,...:PHYSNAME;
     At the end, we see a semicolon instead of a field.

     For the case of overloaded operators, the format is
     OPERATOR::*.methods, where OPERATOR is the string "operator",
     `*' holds the place for an operator name (such as `+=')
     and `.' marks the end of the operator name.  */
  if (p[1] == ':')
    {
      /* Now, read in the methods.  To simplify matters, we
         "unread" the name that has been read, so that we can
         start from the top.  */

      /* For each list of method lists... */
      do
        {
          int i;
          struct next_fnfield *sublist = 0;
          struct type *look_ahead_type = NULL;
          int length = 0;
          struct next_fnfieldlist *new_mainlist =
            (struct next_fnfieldlist *)alloca (sizeof (struct next_fnfieldlist));
          char *main_fn_name;

          p = *pp;

          /* read in the name.  */
          while (*p != ':') p++;
#if 0
          if ((*pp)[0] == 'o' && (*pp)[1] == 'p' && (*pp)[2] == CPLUS_MARKER)
            {
              /* This lets the user type "break operator+".
                 We could just put in "+" as the name, but that wouldn't
                 work for "*".  */
             /* I don't understand what this is trying to do.
                It seems completely bogus.  -Per Bothner. */
              static char opname[32] = {'o', 'p', CPLUS_MARKER};
              char *o = opname + 3;

              /* Skip past '::'.  */
              *pp = p + 2;
              if (**pp == '\\') *pp = next_symbol_text ();
              p = *pp;
              while (*p != '.')
                *o++ = *p++;
              main_fn_name = savestring (opname, o - opname);
              /* Skip past '.'  */
              *pp = p + 1;
            }
          else
#endif
              main_fn_name = savestring (*pp, p - *pp);
          /* Skip past '::'.  */
          *pp = p + 2;
          new_mainlist->fn_fieldlist.name = main_fn_name;

          do
            {
              struct next_fnfield *new_sublist =
                (struct next_fnfield *)alloca (sizeof (struct next_fnfield));

              /* Check for and handle cretinous dbx symbol name continuation!  */
              if (look_ahead_type == NULL) /* Normal case. */
                {
                  if (**pp == '\\') *pp = next_symbol_text ();

                  new_sublist->fn_field.type = read_type (pp);
                  if (**pp != ':')
                    /* Invalid symtab info for method.  */
                    return error_type (pp);
                }
              else
                { /* g++ version 1 kludge */
                  new_sublist->fn_field.type = look_ahead_type;
                  look_ahead_type = NULL;
                }

              *pp += 1;
              p = *pp;
              while (*p != ';') p++;
              /* If this is just a stub, then we don't have the
                 real name here.  */
              new_sublist->fn_field.physname = savestring (*pp, p - *pp);
              *pp = p + 1;
              new_sublist->visibility = *(*pp)++ - '0';
              if (**pp == '\\') *pp = next_symbol_text ();
              switch (**pp)
                {
                case 'A': /* Normal functions. */
                  new_sublist->fn_field.is_const = 0;
                  new_sublist->fn_field.is_volatile = 0;
                  (*pp)++;
                  break;
                case 'B': /* `const' member functions. */
                  new_sublist->fn_field.is_const = 1;
                  new_sublist->fn_field.is_volatile = 0;
                  (*pp)++;
                  break;
                case 'C': /* `volatile' member function. */
                  new_sublist->fn_field.is_const = 0;
                  new_sublist->fn_field.is_volatile = 1;
                  (*pp)++;
                  break;
                case 'D': /* `const volatile' member function. */
                  new_sublist->fn_field.is_const = 1;
                  new_sublist->fn_field.is_volatile = 1;
                  (*pp)++;
                  break;
                default:
                  /* This probably just means we're processing a file compiled
                     with g++ version 1.  */
                  complain(&const_vol_complaint, **pp);
                }

              switch (*(*pp)++)
                {
                case '*':
                  /* virtual member function, followed by index.  */
                  /* The sign bit is set to distinguish pointers-to-methods
                     from virtual function indicies.  Since the array is
                     in words, the quantity must be shifted left by 1
                     on 16 bit machine, and by 2 on 32 bit machine, forcing
                     the sign bit out, and usable as a valid index into
                     the array.  Remove the sign bit here.  */
                  new_sublist->fn_field.voffset =
                      (0x7fffffff & read_number (pp, ';')) + 2;

                  if (**pp == '\\') *pp = next_symbol_text ();

                  if (**pp == ';' || **pp == '\0')
                    /* Must be g++ version 1.  */
                    new_sublist->fn_field.fcontext = 0;
                  else
                    {
                      /* Figure out from whence this virtual function came.
                         It may belong to virtual function table of
                         one of its baseclasses.  */
                      look_ahead_type = read_type (pp);
                      if (**pp == ':')
                        { /* g++ version 1 overloaded methods. */ }
                      else
                        {
                          new_sublist->fn_field.fcontext = look_ahead_type;
                          if (**pp != ';')
                            return error_type (pp);
                          else
                            ++*pp;
                          look_ahead_type = NULL;
                        }
                    }
                  break;

                case '?':
                  /* static member function.  */
                  new_sublist->fn_field.voffset = VOFFSET_STATIC;
                  break;
                default:
                  /* **pp == '.'.  */
                  /* normal member function.  */
                  new_sublist->fn_field.voffset = 0;
                  new_sublist->fn_field.fcontext = 0;
                  break;
                }

              new_sublist->next = sublist;
              sublist = new_sublist;
              length++;
              if (**pp == '\\') *pp = next_symbol_text ();
            }
          while (**pp != ';' && **pp != '\0');

          *pp += 1;

          new_mainlist->fn_fieldlist.fn_fields =
            (struct fn_field *) obstack_alloc (symbol_obstack,
                                               sizeof (struct fn_field) * length);
          TYPE_FN_PRIVATE_BITS (new_mainlist->fn_fieldlist) =
            (B_TYPE *) obstack_alloc (symbol_obstack, B_BYTES (length));
          B_CLRALL (TYPE_FN_PRIVATE_BITS (new_mainlist->fn_fieldlist), length);

          TYPE_FN_PROTECTED_BITS (new_mainlist->fn_fieldlist) =
            (B_TYPE *) obstack_alloc (symbol_obstack, B_BYTES (length));
          B_CLRALL (TYPE_FN_PROTECTED_BITS (new_mainlist->fn_fieldlist), length);

          for (i = length; (i--, sublist); sublist = sublist->next)
            {
              new_mainlist->fn_fieldlist.fn_fields[i] = sublist->fn_field;
              if (sublist->visibility == 0)
                B_SET (new_mainlist->fn_fieldlist.private_fn_field_bits, i);
              else if (sublist->visibility == 1)
                B_SET (new_mainlist->fn_fieldlist.protected_fn_field_bits, i);
            }

          new_mainlist->fn_fieldlist.length = length;
          new_mainlist->next = mainlist;
          mainlist = new_mainlist;
          nfn_fields++;
          total_length += length;
        }
      while (**pp != ';');
    }

  *pp += 1;

  TYPE_FN_FIELDLISTS (type) =
    (struct fn_fieldlist *) obstack_alloc (symbol_obstack,
                                   sizeof (struct fn_fieldlist) * nfn_fields);

  TYPE_NFN_FIELDS (type) = nfn_fields;
  TYPE_NFN_FIELDS_TOTAL (type) = total_length;

  {
    int i;
    for (i = 0; i < TYPE_N_BASECLASSES (type); ++i)
      TYPE_NFN_FIELDS_TOTAL (type) +=
        TYPE_NFN_FIELDS_TOTAL (TYPE_BASECLASS (type, i));
  }

  for (n = nfn_fields; mainlist; mainlist = mainlist->next)
    TYPE_FN_FIELDLISTS (type)[--n] = mainlist->fn_fieldlist;

  if (**pp == '~')
    {
      *pp += 1;

      if (**pp == '=')
        {
          TYPE_FLAGS (type)
            |= TYPE_FLAG_HAS_CONSTRUCTOR | TYPE_FLAG_HAS_DESTRUCTOR;
          *pp += 1;
        }
      else if (**pp == '+')
        {
          TYPE_FLAGS (type) |= TYPE_FLAG_HAS_CONSTRUCTOR;
          *pp += 1;
        }
      else if (**pp == '-')
        {
          TYPE_FLAGS (type) |= TYPE_FLAG_HAS_DESTRUCTOR;
          *pp += 1;
        }

      /* Read either a '%' or the final ';'.  */
      if (*(*pp)++ == '%')
        {
          /* Now we must record the virtual function table pointer's
             field information.  */

          struct type *t;
          int i;

          t = read_type (pp);
          p = (*pp)++;
          while (*p != '\0' && *p != ';')
            p++;
          if (*p == '\0')
            /* Premature end of symbol.  */
            return error_type (pp);
          
          TYPE_VPTR_BASETYPE (type) = t;
          if (type == t)
            {
              if (TYPE_FIELD_NAME (t, TYPE_N_BASECLASSES (t)) == 0)
                {
                  /* FIXME-tiemann: what's this?  */
#if 0
                  TYPE_VPTR_FIELDNO (type) = i = TYPE_N_BASECLASSES (t);
#else
                  error_type (pp);
#endif
                }
              else for (i = TYPE_NFIELDS (t) - 1; i >= TYPE_N_BASECLASSES (t); --i)
                if (! strncmp (TYPE_FIELD_NAME (t, i), vptr_name, 
                        sizeof (vptr_name) -1))
                  {
                    TYPE_VPTR_FIELDNO (type) = i;
                    break;
                  }
              if (i < 0)
                /* Virtual function table field not found.  */
                return error_type (pp);
            }
          else
            TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t);
          *pp = p + 1;
        }
    }

  return type;
}

/* Read a definition of an array type,
   and create and return a suitable type object.
   Also creates a range type which represents the bounds of that
   array.  */
struct type *
read_array_type (pp, type)
     register char **pp;
     register struct type *type;
{
  struct type *index_type, *element_type, *range_type;
  int lower, upper;
  int adjustable = 0;

  /* Format of an array type:
     "ar<index type>;lower;upper;<array_contents_type>".  Put code in
     to handle this.

     Fortran adjustable arrays use Adigits or Tdigits for lower or upper;
     for these, produce a type like float[][].  */

  index_type = read_type (pp);
  if (**pp != ';')
    /* Improper format of array type decl.  */
    return error_type (pp);
  ++*pp;

  if (!(**pp >= '0' && **pp <= '9'))
    {
      *pp += 1;
      adjustable = 1;
    }
  lower = read_number (pp, ';');

  if (!(**pp >= '0' && **pp <= '9'))
    {
      *pp += 1;
      adjustable = 1;
    }
  upper = read_number (pp, ';');
  
  element_type = read_type (pp);

  if (adjustable)
    {
      lower = 0;
      upper = -1;
    }

  {
    /* Create range type.  */
    range_type = (struct type *) obstack_alloc (symbol_obstack,
                                                sizeof (struct type));
    TYPE_CODE (range_type) = TYPE_CODE_RANGE;
    TYPE_TARGET_TYPE (range_type) = index_type;

    /* This should never be needed.  */
    TYPE_LENGTH (range_type) = sizeof (int);

    TYPE_NFIELDS (range_type) = 2;
    TYPE_FIELDS (range_type) =
      (struct field *) obstack_alloc (symbol_obstack,
                                      2 * sizeof (struct field));
    TYPE_FIELD_BITPOS (range_type, 0) = lower;
    TYPE_FIELD_BITPOS (range_type, 1) = upper;
  }

  TYPE_CODE (type) = TYPE_CODE_ARRAY;
  TYPE_TARGET_TYPE (type) = element_type;
  TYPE_LENGTH (type) = (upper - lower + 1) * TYPE_LENGTH (element_type);
  TYPE_NFIELDS (type) = 1;
  TYPE_FIELDS (type) =
    (struct field *) obstack_alloc (symbol_obstack,
                                    sizeof (struct field));
  TYPE_FIELD_TYPE (type, 0) = range_type;

  return type;
}


/* Read a definition of an enumeration type,
   and create and return a suitable type object.
   Also defines the symbols that represent the values of the type.  */

struct type *
read_enum_type (pp, type)
     register char **pp;
     register struct type *type;
{
  register char *p;
  char *name;
  register long n;
  register struct symbol *sym;
  int nsyms = 0;
  struct pending **symlist;
  struct pending *osyms, *syms;
  int o_nsyms;

  if (within_function)
    symlist = &local_symbols;
  else
    symlist = &file_symbols;
  osyms = *symlist;
  o_nsyms = osyms ? osyms->nsyms : 0;

  /* Read the value-names and their values.
     The input syntax is NAME:VALUE,NAME:VALUE, and so on.
     A semicolon or comman instead of a NAME means the end.  */
  while (**pp && **pp != ';' && **pp != ',')
    {
      /* Check for and handle cretinous dbx symbol name continuation!  */
      if (**pp == '\\') *pp = next_symbol_text ();

      p = *pp;
      while (*p != ':') p++;
      name = obsavestring (*pp, p - *pp);
      *pp = p + 1;
      n = read_number (pp, ',');

      sym = (struct symbol *) obstack_alloc (symbol_obstack, sizeof (struct symbol));
      bzero (sym, sizeof (struct symbol));
      SYMBOL_NAME (sym) = name;
      SYMBOL_CLASS (sym) = LOC_CONST;
      SYMBOL_NAMESPACE (sym) = VAR_NAMESPACE;
      SYMBOL_VALUE (sym) = n;
      add_symbol_to_list (sym, symlist);
      nsyms++;
    }

  if (**pp == ';')
    (*pp)++;                    /* Skip the semicolon.  */

  /* Now fill in the fields of the type-structure.  */

  TYPE_LENGTH (type) = sizeof (int);
  TYPE_CODE (type) = TYPE_CODE_ENUM;
  TYPE_NFIELDS (type) = nsyms;
  TYPE_FIELDS (type) = (struct field *) obstack_alloc (symbol_obstack, sizeof (struct field) * nsyms);

  /* Find the symbols for the values and put them into the type.
     The symbols can be found in the symlist that we put them on
     to cause them to be defined.  osyms contains the old value
     of that symlist; everything up to there was defined by us.  */
  /* Note that we preserve the order of the enum constants, so
     that in something like "enum {FOO, LAST_THING=FOO}" we print
     FOO, not LAST_THING.  */

  for (syms = *symlist, n = 0; syms; syms = syms->next)
    {
      int j = 0;
      if (syms == osyms)
        j = o_nsyms;
      for (; j < syms->nsyms; j++,n++)
        {
          struct symbol *xsym = syms->symbol[j];
          SYMBOL_TYPE (xsym) = type;
          TYPE_FIELD_NAME (type, n) = SYMBOL_NAME (xsym);
          TYPE_FIELD_VALUE (type, n) = 0;
          TYPE_FIELD_BITPOS (type, n) = SYMBOL_VALUE (xsym);
          TYPE_FIELD_BITSIZE (type, n) = 0;
        }
      if (syms == osyms)
        break;
    }

#if 0
  /* This screws up perfectly good C programs with enums.  FIXME.  */
  /* Is this Modula-2's BOOLEAN type?  Flag it as such if so. */
  if(TYPE_NFIELDS(type) == 2 &&
     ((!strcmp(TYPE_FIELD_NAME(type,0),"TRUE") &&
       !strcmp(TYPE_FIELD_NAME(type,1),"FALSE")) ||
      (!strcmp(TYPE_FIELD_NAME(type,1),"TRUE") &&
       !strcmp(TYPE_FIELD_NAME(type,0),"FALSE"))))
     TYPE_CODE(type) = TYPE_CODE_BOOL;
#endif

  return type;
}

/* Read a number from the string pointed to by *PP.
   The value of *PP is advanced over the number.
   If END is nonzero, the character that ends the
   number must match END, or an error happens;
   and that character is skipped if it does match.
   If END is zero, *PP is left pointing to that character.

   If the number fits in a long, set *VALUE and set *BITS to 0.
   If not, set *BITS to be the number of bits in the number.

   If encounter garbage, set *BITS to -1.  */

void
read_huge_number (pp, end, valu, bits)
     char **pp;
     int end;
     long *valu;
     int *bits;
{
  char *p = *pp;
  int sign = 1;
  long n = 0;
  int radix = 10;
  char overflow = 0;
  int nbits = 0;
  int c;
  long upper_limit;
  
  if (*p == '-')
    {
      sign = -1;
      p++;
    }

  /* Leading zero means octal.  GCC uses this to output values larger
     than an int (because that would be hard in decimal).  */
  if (*p == '0')
    {
      radix = 8;
      p++;
    }

  upper_limit = LONG_MAX / radix;
  while ((c = *p++) >= '0' && c <= ('0' + radix))
    {
      if (n <= upper_limit)
        {
          n *= radix;
          n += c - '0';         /* FIXME this overflows anyway */
        }
      else
        overflow = 1;
      
      /* This depends on large values being output in octal, which is
         what GCC does. */
      if (radix == 8)
        {
          if (nbits == 0)
            {
              if (c == '0')
                /* Ignore leading zeroes.  */
                ;
              else if (c == '1')
                nbits = 1;
              else if (c == '2' || c == '3')
                nbits = 2;
              else
                nbits = 3;
            }
          else
            nbits += 3;
        }
    }
  if (end)
    {
      if (c && c != end)
        {
          if (bits != NULL)
            *bits = -1;
          return;
        }
    }
  else
    --p;

  *pp = p;
  if (overflow)
    {
      if (nbits == 0)
        {
          /* Large decimal constants are an error (because it is hard to
             count how many bits are in them).  */
          if (bits != NULL)
            *bits = -1;
          return;
        }
      
      /* -0x7f is the same as 0x80.  So deal with it by adding one to
         the number of bits.  */
      if (sign == -1)
        ++nbits;
      if (bits)
        *bits = nbits;
    }
  else
    {
      if (valu)
        *valu = n * sign;
      if (bits)
        *bits = 0;
    }
}

#define MAX_OF_C_TYPE(t)        ((1 << (sizeof (t)*8 - 1)) - 1)
#define MIN_OF_C_TYPE(t)        (-(1 << (sizeof (t)*8 - 1)))

struct type *
read_range_type (pp, typenums)
     char **pp;
     int typenums[2];
{
  int rangenums[2];
  long n2, n3;
  int n2bits, n3bits;
  int self_subrange;
  struct type *result_type;

  /* First comes a type we are a subrange of.
     In C it is usually 0, 1 or the type being defined.  */
  read_type_number (pp, rangenums);
  self_subrange = (rangenums[0] == typenums[0] &&
                   rangenums[1] == typenums[1]);

  /* A semicolon should now follow; skip it.  */
  if (**pp == ';')
    (*pp)++;

  /* The remaining two operands are usually lower and upper bounds
     of the range.  But in some special cases they mean something else.  */
  read_huge_number (pp, ';', &n2, &n2bits);
  read_huge_number (pp, ';', &n3, &n3bits);

  if (n2bits == -1 || n3bits == -1)
    return error_type (pp);
  
  /* If limits are huge, must be large integral type.  */
  if (n2bits != 0 || n3bits != 0)
    {
      char got_signed = 0;
      char got_unsigned = 0;
      /* Number of bits in the type.  */
      int nbits;

      /* Range from 0 to <large number> is an unsigned large integral type.  */
      if ((n2bits == 0 && n2 == 0) && n3bits != 0)
        {
          got_unsigned = 1;
          nbits = n3bits;
        }
      /* Range from <large number> to <large number>-1 is a large signed
         integral type.  */
      else if (n2bits != 0 && n3bits != 0 && n2bits == n3bits + 1)
        {
          got_signed = 1;
          nbits = n2bits;
        }

      /* Check for "long long".  */
      if (got_signed && nbits == TARGET_LONG_LONG_BIT)
        return builtin_type_long_long;
      if (got_unsigned && nbits == TARGET_LONG_LONG_BIT)
        return builtin_type_unsigned_long_long;

      if (got_signed || got_unsigned)
        {
          result_type = (struct type *) obstack_alloc (symbol_obstack,
                                                       sizeof (struct type));
          bzero (result_type, sizeof (struct type));
          TYPE_LENGTH (result_type) = nbits / TARGET_CHAR_BIT;
          TYPE_MAIN_VARIANT (result_type) = result_type;
          TYPE_CODE (result_type) = TYPE_CODE_INT;
          if (got_unsigned)
            TYPE_FLAGS (result_type) |= TYPE_FLAG_UNSIGNED;
          return result_type;
        }
      else
        return error_type (pp);
    }

  /* A type defined as a subrange of itself, with bounds both 0, is void.  */
  if (self_subrange && n2 == 0 && n3 == 0)
    return builtin_type_void;

  /* If n3 is zero and n2 is not, we want a floating type,
     and n2 is the width in bytes.

     Fortran programs appear to use this for complex types also,
     and they give no way to distinguish between double and single-complex!
     We don't have complex types, so we would lose on all fortran files!
     So return type `double' for all of those.  It won't work right
     for the complex values, but at least it makes the file loadable.  */

  if (n3 == 0 && n2 > 0)
    {
      if (n2 == sizeof (float))
        return builtin_type_float;
      return builtin_type_double;
    }

  /* If the upper bound is -1, it must really be an unsigned int.  */

  else if (n2 == 0 && n3 == -1)
    {
      /* FIXME -- this confuses host and target type sizes.  */
      if (sizeof (int) == sizeof (long))
        return builtin_type_unsigned_int;
      else
        return builtin_type_unsigned_long;
    }

  /* Special case: char is defined (Who knows why) as a subrange of
     itself with range 0-127.  */
  else if (self_subrange && n2 == 0 && n3 == 127)
    return builtin_type_char;

  /* Assumptions made here: Subrange of self is equivalent to subrange
     of int.  FIXME:  Host and target type-sizes assumed the same.  */
  else if (n2 == 0
           && (self_subrange ||
               *dbx_lookup_type (rangenums) == builtin_type_int))
    {
      /* an unsigned type */
#ifdef LONG_LONG
      if (n3 == - sizeof (long long))
        return builtin_type_unsigned_long_long;
#endif
      if (n3 == (unsigned int)~0L)
        return builtin_type_unsigned_int;
      if (n3 == (unsigned long)~0L)
        return builtin_type_unsigned_long;
      if (n3 == (unsigned short)~0L)
        return builtin_type_unsigned_short;
      if (n3 == (unsigned char)~0L)
        return builtin_type_unsigned_char;
    }
#ifdef LONG_LONG
  else if (n3 == 0 && n2 == -sizeof (long long))
    return builtin_type_long_long;
#endif  
  else if (n2 == -n3 -1)
    {
      /* a signed type */
      if (n3 == (1 << (8 * sizeof (int) - 1)) - 1)
        return builtin_type_int;
      if (n3 == (1 << (8 * sizeof (long) - 1)) - 1)
         return builtin_type_long;
      if (n3 == (1 << (8 * sizeof (short) - 1)) - 1)
        return builtin_type_short;
      if (n3 == (1 << (8 * sizeof (char) - 1)) - 1)
        return builtin_type_char;
    }

  /* We have a real range type on our hands.  Allocate space and
     return a real pointer.  */

  /* At this point I don't have the faintest idea how to deal with
     a self_subrange type; I'm going to assume that this is used
     as an idiom, and that all of them are special cases.  So . . .  */
  if (self_subrange)
    return error_type (pp);

  result_type = (struct type *) obstack_alloc (symbol_obstack,
                                               sizeof (struct type));
  bzero (result_type, sizeof (struct type));

  TYPE_CODE (result_type) = TYPE_CODE_RANGE;

  TYPE_TARGET_TYPE (result_type) = *dbx_lookup_type(rangenums);
  if (TYPE_TARGET_TYPE (result_type) == 0) {
    complain (&range_type_base_complaint, rangenums[1]);
    TYPE_TARGET_TYPE (result_type) = builtin_type_int;
  }

  TYPE_NFIELDS (result_type) = 2;
  TYPE_FIELDS (result_type) =
     (struct field *) obstack_alloc (symbol_obstack,
                                     2 * sizeof (struct field));
  bzero (TYPE_FIELDS (result_type), 2 * sizeof (struct field));
  TYPE_FIELD_BITPOS (result_type, 0) = n2;
  TYPE_FIELD_BITPOS (result_type, 1) = n3;

#if 0
/* Note that TYPE_LENGTH (result_type) is just overridden a few
   statements down.  What do we really need here?  */
  /* We have to figure out how many bytes it takes to hold this
     range type.  I'm going to assume that anything that is pushing
     the bounds of a long was taken care of above.  */
  if (n2 >= MIN_OF_C_TYPE(char) && n3 <= MAX_OF_C_TYPE(char))
    TYPE_LENGTH (result_type) = 1;
  else if (n2 >= MIN_OF_C_TYPE(short) && n3 <= MAX_OF_C_TYPE(short))
    TYPE_LENGTH (result_type) = sizeof (short);
  else if (n2 >= MIN_OF_C_TYPE(int) && n3 <= MAX_OF_C_TYPE(int))
    TYPE_LENGTH (result_type) = sizeof (int);
  else if (n2 >= MIN_OF_C_TYPE(long) && n3 <= MAX_OF_C_TYPE(long))
    TYPE_LENGTH (result_type) = sizeof (long);
  else
    /* Ranged type doesn't fit within known sizes.  */
    /* FIXME -- use "long long" here.  */
    return error_type (pp);
#endif

  TYPE_LENGTH (result_type) = TYPE_LENGTH (TYPE_TARGET_TYPE (result_type));

  return result_type;
}

/* Read a number from the string pointed to by *PP.
   The value of *PP is advanced over the number.
   If END is nonzero, the character that ends the
   number must match END, or an error happens;
   and that character is skipped if it does match.
   If END is zero, *PP is left pointing to that character.  */

long
read_number (pp, end)
     char **pp;
     int end;
{
  register char *p = *pp;
  register long n = 0;
  register int c;
  int sign = 1;

  /* Handle an optional leading minus sign.  */

  if (*p == '-')
    {
      sign = -1;
      p++;
    }

  /* Read the digits, as far as they go.  */

  while ((c = *p++) >= '0' && c <= '9')
    {
      n *= 10;
      n += c - '0';
    }
  if (end)
    {
      if (c && c != end)
        error ("Invalid symbol data: invalid character \\%03o at symbol pos %d.", c, symnum);
    }
  else
    --p;

  *pp = p;
  return n * sign;
}

/* Read in an argument list.  This is a list of types, separated by commas
   and terminated with END.  Return the list of types read in, or (struct type
   **)-1 if there is an error.  */
struct type **
read_args (pp, end)
     char **pp;
     int end;
{
  /* FIXME!  Remove this arbitrary limit!  */
  struct type *types[1024], **rval; /* allow for fns of 1023 parameters */
  int n = 0;

  while (**pp != end)
    {
      if (**pp != ',')
        /* Invalid argument list: no ','.  */
        return (struct type **)-1;
      *pp += 1;

      /* Check for and handle cretinous dbx symbol name continuation! */
      if (**pp == '\\')
        *pp = next_symbol_text ();

      types[n++] = read_type (pp);
    }
  *pp += 1;                     /* get past `end' (the ':' character) */

  if (n == 1)
    {
      rval = (struct type **) xmalloc (2 * sizeof (struct type *));
    }
  else if (TYPE_CODE (types[n-1]) != TYPE_CODE_VOID)
    {
      rval = (struct type **) xmalloc ((n + 1) * sizeof (struct type *));
      bzero (rval + n, sizeof (struct type *));
    }
  else
    {
      rval = (struct type **) xmalloc (n * sizeof (struct type *));
    }
  bcopy (types, rval, n * sizeof (struct type *));
  return rval;
}

/* Add a common block's start address to the offset of each symbol
   declared to be in it (by being between a BCOMM/ECOMM pair that uses
   the common block name).  */

static void
fix_common_block (sym, valu)
    struct symbol *sym;
    int valu;
{
  struct pending *next = (struct pending *) SYMBOL_NAMESPACE (sym);
  for ( ; next; next = next->next)
    {
      register int j;
      for (j = next->nsyms - 1; j >= 0; j--)
        SYMBOL_VALUE_ADDRESS (next->symbol[j]) += valu;
    }
}

/* Initializer for this module */
void
_initialize_buildsym ()
{
  undef_types_allocated = 20;
  undef_types_length = 0;
  undef_types = (struct type **) xmalloc (undef_types_allocated *
                                          sizeof (struct type *));
}