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[deliverable/binutils-gdb.git] / gdb / dwarf2read.c

/* DWARF 2 debugging format support for GDB.
   Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
   Free Software Foundation, Inc.

   Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
   Inc.  with support from Florida State University (under contract
   with the Ada Joint Program Office), and Silicon Graphics, Inc.
   Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
   based on Fred Fish's (Cygnus Support) implementation of DWARF 1
   support in dwarfread.c

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "bfd.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "symfile.h"
#include "objfiles.h"
#include "elf/dwarf2.h"
#include "buildsym.h"
#include "demangle.h"
#include "expression.h"
#include "filenames.h"  /* for DOSish file names */
#include "macrotab.h"
#include "language.h"
#include "complaints.h"
#include "bcache.h"
#include "dwarf2expr.h"
#include "dwarf2loc.h"
#include "cp-support.h"

#include <fcntl.h>
#include "gdb_string.h"
#include "gdb_assert.h"
#include <sys/types.h>

#ifndef DWARF2_REG_TO_REGNUM
#define DWARF2_REG_TO_REGNUM(REG) (REG)
#endif

#if 0
/* .debug_info header for a compilation unit
   Because of alignment constraints, this structure has padding and cannot
   be mapped directly onto the beginning of the .debug_info section.  */
typedef struct comp_unit_header
  {
    unsigned int length;        /* length of the .debug_info
                                   contribution */
    unsigned short version;     /* version number -- 2 for DWARF
                                   version 2 */
    unsigned int abbrev_offset; /* offset into .debug_abbrev section */
    unsigned char addr_size;    /* byte size of an address -- 4 */
  }
_COMP_UNIT_HEADER;
#define _ACTUAL_COMP_UNIT_HEADER_SIZE 11
#endif

/* .debug_pubnames header
   Because of alignment constraints, this structure has padding and cannot
   be mapped directly onto the beginning of the .debug_info section.  */
typedef struct pubnames_header
  {
    unsigned int length;        /* length of the .debug_pubnames
                                   contribution  */
    unsigned char version;      /* version number -- 2 for DWARF
                                   version 2 */
    unsigned int info_offset;   /* offset into .debug_info section */
    unsigned int info_size;     /* byte size of .debug_info section
                                   portion */
  }
_PUBNAMES_HEADER;
#define _ACTUAL_PUBNAMES_HEADER_SIZE 13

/* .debug_pubnames header
   Because of alignment constraints, this structure has padding and cannot
   be mapped directly onto the beginning of the .debug_info section.  */
typedef struct aranges_header
  {
    unsigned int length;        /* byte len of the .debug_aranges
                                   contribution */
    unsigned short version;     /* version number -- 2 for DWARF
                                   version 2 */
    unsigned int info_offset;   /* offset into .debug_info section */
    unsigned char addr_size;    /* byte size of an address */
    unsigned char seg_size;     /* byte size of segment descriptor */
  }
_ARANGES_HEADER;
#define _ACTUAL_ARANGES_HEADER_SIZE 12

/* .debug_line statement program prologue
   Because of alignment constraints, this structure has padding and cannot
   be mapped directly onto the beginning of the .debug_info section.  */
typedef struct statement_prologue
  {
    unsigned int total_length;  /* byte length of the statement
                                   information */
    unsigned short version;     /* version number -- 2 for DWARF
                                   version 2 */
    unsigned int prologue_length;       /* # bytes between prologue &
                                           stmt program */
    unsigned char minimum_instruction_length;   /* byte size of
                                                   smallest instr */
    unsigned char default_is_stmt;      /* initial value of is_stmt
                                           register */
    char line_base;
    unsigned char line_range;
    unsigned char opcode_base;  /* number assigned to first special
                                   opcode */
    unsigned char *standard_opcode_lengths;
  }
_STATEMENT_PROLOGUE;

/* offsets and sizes of debugging sections */

static file_ptr dwarf_info_offset;
static file_ptr dwarf_abbrev_offset;
static file_ptr dwarf_line_offset;
static file_ptr dwarf_pubnames_offset;
static file_ptr dwarf_aranges_offset;
static file_ptr dwarf_loc_offset;
static file_ptr dwarf_macinfo_offset;
static file_ptr dwarf_str_offset;
static file_ptr dwarf_ranges_offset;
file_ptr dwarf_frame_offset;
file_ptr dwarf_eh_frame_offset;

static unsigned int dwarf_info_size;
static unsigned int dwarf_abbrev_size;
static unsigned int dwarf_line_size;
static unsigned int dwarf_pubnames_size;
static unsigned int dwarf_aranges_size;
static unsigned int dwarf_loc_size;
static unsigned int dwarf_macinfo_size;
static unsigned int dwarf_str_size;
static unsigned int dwarf_ranges_size;
unsigned int dwarf_frame_size;
unsigned int dwarf_eh_frame_size;

static asection *dwarf_info_section;
static asection *dwarf_abbrev_section;
static asection *dwarf_line_section;
static asection *dwarf_pubnames_section;
static asection *dwarf_aranges_section;
static asection *dwarf_loc_section;
static asection *dwarf_macinfo_section;
static asection *dwarf_str_section;
static asection *dwarf_ranges_section;
asection *dwarf_frame_section;
asection *dwarf_eh_frame_section;

/* names of the debugging sections */

#define INFO_SECTION     ".debug_info"
#define ABBREV_SECTION   ".debug_abbrev"
#define LINE_SECTION     ".debug_line"
#define PUBNAMES_SECTION ".debug_pubnames"
#define ARANGES_SECTION  ".debug_aranges"
#define LOC_SECTION      ".debug_loc"
#define MACINFO_SECTION  ".debug_macinfo"
#define STR_SECTION      ".debug_str"
#define RANGES_SECTION   ".debug_ranges"
#define FRAME_SECTION    ".debug_frame"
#define EH_FRAME_SECTION ".eh_frame"

/* local data types */

/* We hold several abbreviation tables in memory at the same time. */
#ifndef ABBREV_HASH_SIZE
#define ABBREV_HASH_SIZE 121
#endif

/* The data in a compilation unit header, after target2host
   translation, looks like this.  */
struct comp_unit_head
  {
    unsigned long length;
    short version;
    unsigned int abbrev_offset;
    unsigned char addr_size;
    unsigned char signed_addr_p;
    unsigned int offset_size;   /* size of file offsets; either 4 or 8 */
    unsigned int initial_length_size; /* size of the length field; either
                                         4 or 12 */

    /* Offset to the first byte of this compilation unit header in the 
     * .debug_info section, for resolving relative reference dies. */

    unsigned int offset;

    /* Pointer to this compilation unit header in the .debug_info
     * section */

    char *cu_head_ptr;

    /* Pointer to the first die of this compilatio unit.  This will
     * be the first byte following the compilation unit header. */

    char *first_die_ptr;

    /* Pointer to the next compilation unit header in the program. */

    struct comp_unit_head *next;

    /* DWARF abbreviation table associated with this compilation unit */

    struct abbrev_info *dwarf2_abbrevs[ABBREV_HASH_SIZE];

    /* Base address of this compilation unit.  */

    CORE_ADDR base_address;

    /* Non-zero if base_address has been set.  */

    int base_known;
  };

/* The line number information for a compilation unit (found in the
   .debug_line section) begins with a "statement program header",
   which contains the following information.  */
struct line_header
{
  unsigned int total_length;
  unsigned short version;
  unsigned int header_length;
  unsigned char minimum_instruction_length;
  unsigned char default_is_stmt;
  int line_base;
  unsigned char line_range;
  unsigned char opcode_base;

  /* standard_opcode_lengths[i] is the number of operands for the
     standard opcode whose value is i.  This means that
     standard_opcode_lengths[0] is unused, and the last meaningful
     element is standard_opcode_lengths[opcode_base - 1].  */
  unsigned char *standard_opcode_lengths;

  /* The include_directories table.  NOTE!  These strings are not
     allocated with xmalloc; instead, they are pointers into
     debug_line_buffer.  If you try to free them, `free' will get
     indigestion.  */
  unsigned int num_include_dirs, include_dirs_size;
  char **include_dirs;

  /* The file_names table.  NOTE!  These strings are not allocated
     with xmalloc; instead, they are pointers into debug_line_buffer.
     Don't try to free them directly.  */
  unsigned int num_file_names, file_names_size;
  struct file_entry
  {
    char *name;
    unsigned int dir_index;
    unsigned int mod_time;
    unsigned int length;
  } *file_names;

  /* The start and end of the statement program following this
     header.  These point into dwarf_line_buffer.  */
  char *statement_program_start, *statement_program_end;
};

/* When we construct a partial symbol table entry we only
   need this much information. */
struct partial_die_info
  {
    enum dwarf_tag tag;
    unsigned char has_children;
    unsigned char is_external;
    unsigned char is_declaration;
    unsigned char has_type;
    unsigned int offset;
    unsigned int abbrev;
    char *name;
    int has_pc_info;
    CORE_ADDR lowpc;
    CORE_ADDR highpc;
    struct dwarf_block *locdesc;
    unsigned int language;
    char *sibling;
  };

/* This data structure holds the information of an abbrev. */
struct abbrev_info
  {
    unsigned int number;        /* number identifying abbrev */
    enum dwarf_tag tag;         /* dwarf tag */
    int has_children;           /* boolean */
    unsigned int num_attrs;     /* number of attributes */
    struct attr_abbrev *attrs;  /* an array of attribute descriptions */
    struct abbrev_info *next;   /* next in chain */
  };

struct attr_abbrev
  {
    enum dwarf_attribute name;
    enum dwarf_form form;
  };

/* This data structure holds a complete die structure. */
struct die_info
  {
    enum dwarf_tag tag;         /* Tag indicating type of die */
    unsigned short has_children;        /* Does the die have children */
    unsigned int abbrev;        /* Abbrev number */
    unsigned int offset;        /* Offset in .debug_info section */
    unsigned int num_attrs;     /* Number of attributes */
    struct attribute *attrs;    /* An array of attributes */
    struct die_info *next_ref;  /* Next die in ref hash table */
    struct die_info *next;      /* Next die in linked list */
    struct type *type;          /* Cached type information */
  };

/* Attributes have a name and a value */
struct attribute
  {
    enum dwarf_attribute name;
    enum dwarf_form form;
    union
      {
        char *str;
        struct dwarf_block *blk;
        unsigned long unsnd;
        long int snd;
        CORE_ADDR addr;
      }
    u;
  };

struct function_range
{
  const char *name;
  CORE_ADDR lowpc, highpc;
  int seen_line;
  struct function_range *next;
};

static struct function_range *cu_first_fn, *cu_last_fn, *cu_cached_fn;

/* Get at parts of an attribute structure */

#define DW_STRING(attr)    ((attr)->u.str)
#define DW_UNSND(attr)     ((attr)->u.unsnd)
#define DW_BLOCK(attr)     ((attr)->u.blk)
#define DW_SND(attr)       ((attr)->u.snd)
#define DW_ADDR(attr)      ((attr)->u.addr)

/* Blocks are a bunch of untyped bytes. */
struct dwarf_block
  {
    unsigned int size;
    char *data;
  };

#ifndef ATTR_ALLOC_CHUNK
#define ATTR_ALLOC_CHUNK 4
#endif

/* A hash table of die offsets for following references.  */
#ifndef REF_HASH_SIZE
#define REF_HASH_SIZE 1021
#endif

static struct die_info *die_ref_table[REF_HASH_SIZE];

/* Obstack for allocating temporary storage used during symbol reading.  */
static struct obstack dwarf2_tmp_obstack;

/* Offset to the first byte of the current compilation unit header,
   for resolving relative reference dies. */
static unsigned int cu_header_offset;

/* Allocate fields for structs, unions and enums in this size.  */
#ifndef DW_FIELD_ALLOC_CHUNK
#define DW_FIELD_ALLOC_CHUNK 4
#endif

/* The language we are debugging.  */
static enum language cu_language;
static const struct language_defn *cu_language_defn;

/* Actually data from the sections.  */
static char *dwarf_info_buffer;
static char *dwarf_abbrev_buffer;
static char *dwarf_line_buffer;
static char *dwarf_str_buffer;
static char *dwarf_macinfo_buffer;
static char *dwarf_ranges_buffer;
static char *dwarf_loc_buffer;

/* A zeroed version of a partial die for initialization purposes.  */
static struct partial_die_info zeroed_partial_die;

/* The generic symbol table building routines have separate lists for
   file scope symbols and all all other scopes (local scopes).  So
   we need to select the right one to pass to add_symbol_to_list().
   We do it by keeping a pointer to the correct list in list_in_scope.

   FIXME:  The original dwarf code just treated the file scope as the first
   local scope, and all other local scopes as nested local scopes, and worked
   fine.  Check to see if we really need to distinguish these
   in buildsym.c.  */
static struct pending **list_in_scope = &file_symbols;

/* FIXME: decode_locdesc sets these variables to describe the location
   to the caller.  These ought to be a structure or something.   If
   none of the flags are set, the object lives at the address returned
   by decode_locdesc.  */

static int optimized_out;       /* No ops in location in expression,
                                   so object was optimized out.  */
static int isreg;               /* Object lives in register.
                                   decode_locdesc's return value is
                                   the register number.  */
static int offreg;              /* Object's address is the sum of the
                                   register specified by basereg, plus
                                   the offset returned.  */
static int basereg;             /* See `offreg'.  */
static int isderef;             /* Value described by flags above is
                                   the address of a pointer to the object.  */
static int islocal;             /* Variable is at the returned offset
                                   from the frame start, but there's
                                   no identified frame pointer for
                                   this function, so we can't say
                                   which register it's relative to;
                                   use LOC_LOCAL.  */
static int is_thread_local;     /* Variable is at a constant offset in the
                                   thread-local storage block for the
                                   current thread and the dynamic linker
                                   module containing this expression.
                                   decode_locdesc returns the offset from
                                   that base.  */

/* DW_AT_frame_base values for the current function.
   frame_base_reg is -1 if DW_AT_frame_base is missing, otherwise it
   contains the register number for the frame register.
   frame_base_offset is the offset from the frame register to the
   virtual stack frame. */
static int frame_base_reg;
static CORE_ADDR frame_base_offset;

/* This value is added to each symbol value.  FIXME:  Generalize to
   the section_offsets structure used by dbxread (once this is done,
   pass the appropriate section number to end_symtab).  */
static CORE_ADDR baseaddr;      /* Add to each symbol value */

/* We put a pointer to this structure in the read_symtab_private field
   of the psymtab.
   The complete dwarf information for an objfile is kept in the
   psymbol_obstack, so that absolute die references can be handled.
   Most of the information in this structure is related to an entire
   object file and could be passed via the sym_private field of the objfile.
   It is however conceivable that dwarf2 might not be the only type
   of symbols read from an object file.  */

struct dwarf2_pinfo
  {
    /* Pointer to start of dwarf info buffer for the objfile.  */

    char *dwarf_info_buffer;

    /* Offset in dwarf_info_buffer for this compilation unit. */

    unsigned long dwarf_info_offset;

    /* Pointer to start of dwarf abbreviation buffer for the objfile.  */

    char *dwarf_abbrev_buffer;

    /* Size of dwarf abbreviation section for the objfile.  */

    unsigned int dwarf_abbrev_size;

    /* Pointer to start of dwarf line buffer for the objfile.  */

    char *dwarf_line_buffer;

    /* Size of dwarf_line_buffer, in bytes.  */
    
    unsigned int dwarf_line_size;

    /* Pointer to start of dwarf string buffer for the objfile.  */

    char *dwarf_str_buffer;

    /* Size of dwarf string section for the objfile.  */

    unsigned int dwarf_str_size;

    /* Pointer to start of dwarf macro buffer for the objfile.  */

    char *dwarf_macinfo_buffer;

    /* Size of dwarf macinfo section for the objfile.  */
    
    unsigned int dwarf_macinfo_size;

    /* Pointer to start of dwarf ranges buffer for the objfile.  */

    char *dwarf_ranges_buffer;

    /* Size of dwarf ranges buffer for the objfile.  */

    unsigned int dwarf_ranges_size;

    /* Pointer to start of dwarf locations buffer for the objfile.  */

    char *dwarf_loc_buffer;

    /* Size of dwarf locations buffer for the objfile.  */

    unsigned int dwarf_loc_size;
  };

#define PST_PRIVATE(p) ((struct dwarf2_pinfo *)(p)->read_symtab_private)
#define DWARF_INFO_BUFFER(p) (PST_PRIVATE(p)->dwarf_info_buffer)
#define DWARF_INFO_OFFSET(p) (PST_PRIVATE(p)->dwarf_info_offset)
#define DWARF_ABBREV_BUFFER(p) (PST_PRIVATE(p)->dwarf_abbrev_buffer)
#define DWARF_ABBREV_SIZE(p) (PST_PRIVATE(p)->dwarf_abbrev_size)
#define DWARF_LINE_BUFFER(p) (PST_PRIVATE(p)->dwarf_line_buffer)
#define DWARF_LINE_SIZE(p)   (PST_PRIVATE(p)->dwarf_line_size)
#define DWARF_STR_BUFFER(p)  (PST_PRIVATE(p)->dwarf_str_buffer)
#define DWARF_STR_SIZE(p)    (PST_PRIVATE(p)->dwarf_str_size)
#define DWARF_MACINFO_BUFFER(p) (PST_PRIVATE(p)->dwarf_macinfo_buffer)
#define DWARF_MACINFO_SIZE(p)   (PST_PRIVATE(p)->dwarf_macinfo_size)
#define DWARF_RANGES_BUFFER(p)  (PST_PRIVATE(p)->dwarf_ranges_buffer)
#define DWARF_RANGES_SIZE(p)    (PST_PRIVATE(p)->dwarf_ranges_size)
#define DWARF_LOC_BUFFER(p)     (PST_PRIVATE(p)->dwarf_loc_buffer)
#define DWARF_LOC_SIZE(p)       (PST_PRIVATE(p)->dwarf_loc_size)

/* Maintain an array of referenced fundamental types for the current
   compilation unit being read.  For DWARF version 1, we have to construct
   the fundamental types on the fly, since no information about the
   fundamental types is supplied.  Each such fundamental type is created by
   calling a language dependent routine to create the type, and then a
   pointer to that type is then placed in the array at the index specified
   by it's FT_<TYPENAME> value.  The array has a fixed size set by the
   FT_NUM_MEMBERS compile time constant, which is the number of predefined
   fundamental types gdb knows how to construct.  */
static struct type *ftypes[FT_NUM_MEMBERS];     /* Fundamental types */

/* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
   but this would require a corresponding change in unpack_field_as_long
   and friends.  */
static int bits_per_byte = 8;

/* The routines that read and process dies for a C struct or C++ class
   pass lists of data member fields and lists of member function fields
   in an instance of a field_info structure, as defined below.  */
struct field_info
  {
    /* List of data member and baseclasses fields. */
    struct nextfield
      {
        struct nextfield *next;
        int accessibility;
        int virtuality;
        struct field field;
      }
     *fields;

    /* Number of fields.  */
    int nfields;

    /* Number of baseclasses.  */
    int nbaseclasses;

    /* Set if the accesibility of one of the fields is not public.  */
    int non_public_fields;

    /* Member function fields array, entries are allocated in the order they
       are encountered in the object file.  */
    struct nextfnfield
      {
        struct nextfnfield *next;
        struct fn_field fnfield;
      }
     *fnfields;

    /* Member function fieldlist array, contains name of possibly overloaded
       member function, number of overloaded member functions and a pointer
       to the head of the member function field chain.  */
    struct fnfieldlist
      {
        char *name;
        int length;
        struct nextfnfield *head;
      }
     *fnfieldlists;

    /* Number of entries in the fnfieldlists array.  */
    int nfnfields;
  };

/* Various complaints about symbol reading that don't abort the process */

static void
dwarf2_non_const_array_bound_ignored_complaint (const char *arg1)
{
  complaint (&symfile_complaints, "non-constant array bounds form '%s' ignored",
             arg1);
}

static void
dwarf2_statement_list_fits_in_line_number_section_complaint (void)
{
  complaint (&symfile_complaints,
             "statement list doesn't fit in .debug_line section");
}

static void
dwarf2_complex_location_expr_complaint (void)
{
  complaint (&symfile_complaints, "location expression too complex");
}

static void
dwarf2_unsupported_at_frame_base_complaint (const char *arg1)
{
  complaint (&symfile_complaints,
             "unsupported DW_AT_frame_base for function '%s'", arg1);
}

static void
dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
                                              int arg3)
{
  complaint (&symfile_complaints,
             "const value length mismatch for '%s', got %d, expected %d", arg1,
             arg2, arg3);
}

static void
dwarf2_macros_too_long_complaint (void)
{
  complaint (&symfile_complaints,
             "macro info runs off end of `.debug_macinfo' section");
}

static void
dwarf2_macro_malformed_definition_complaint (const char *arg1)
{
  complaint (&symfile_complaints,
             "macro debug info contains a malformed macro definition:\n`%s'",
             arg1);
}

static void
dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
{
  complaint (&symfile_complaints,
             "invalid attribute class or form for '%s' in '%s'", arg1, arg2);
}

/* local function prototypes */

static void dwarf2_locate_sections (bfd *, asection *, void *);

#if 0
static void dwarf2_build_psymtabs_easy (struct objfile *, int);
#endif

static void dwarf2_build_psymtabs_hard (struct objfile *, int);

static char *scan_partial_symbols (char *, struct objfile *,
                                   CORE_ADDR *, CORE_ADDR *,
                                   const struct comp_unit_head *);

static void add_partial_symbol (struct partial_die_info *, struct objfile *,
                                const struct comp_unit_head *);

static void dwarf2_psymtab_to_symtab (struct partial_symtab *);

static void psymtab_to_symtab_1 (struct partial_symtab *);

char *dwarf2_read_section (struct objfile *, file_ptr, unsigned int,
                           asection *);

static void dwarf2_read_abbrevs (bfd *abfd, struct comp_unit_head *cu_header);

static void dwarf2_empty_abbrev_table (void *);

static struct abbrev_info *dwarf2_lookup_abbrev (unsigned int,
                                         const struct comp_unit_head *cu_header);

static char *read_partial_die (struct partial_die_info *,
                               bfd *, char *,
                               const struct comp_unit_head *);

static char *read_full_die (struct die_info **, bfd *, char *,
                            const struct comp_unit_head *);

static char *read_attribute (struct attribute *, struct attr_abbrev *,
                             bfd *, char *, const struct comp_unit_head *);

static char *read_attribute_value (struct attribute *, unsigned,
                             bfd *, char *, const struct comp_unit_head *);

static unsigned int read_1_byte (bfd *, char *);

static int read_1_signed_byte (bfd *, char *);

static unsigned int read_2_bytes (bfd *, char *);

static unsigned int read_4_bytes (bfd *, char *);

static unsigned long read_8_bytes (bfd *, char *);

static CORE_ADDR read_address (bfd *, char *ptr, const struct comp_unit_head *,
                               int *bytes_read);

static LONGEST read_initial_length (bfd *, char *,
                                    struct comp_unit_head *, int *bytes_read);

static LONGEST read_offset (bfd *, char *, const struct comp_unit_head *,
                            int *bytes_read);

static char *read_n_bytes (bfd *, char *, unsigned int);

static char *read_string (bfd *, char *, unsigned int *);

static char *read_indirect_string (bfd *, char *, const struct comp_unit_head *,
                                   unsigned int *);

static unsigned long read_unsigned_leb128 (bfd *, char *, unsigned int *);

static long read_signed_leb128 (bfd *, char *, unsigned int *);

static void set_cu_language (unsigned int);

static struct attribute *dwarf_attr (struct die_info *, unsigned int);

static int die_is_declaration (struct die_info *);

static void free_line_header (struct line_header *lh);

static struct line_header *(dwarf_decode_line_header
                            (unsigned int offset,
                             bfd *abfd,
                             const struct comp_unit_head *cu_header));

static void dwarf_decode_lines (struct line_header *, char *, bfd *,
                                const struct comp_unit_head *);

static void dwarf2_start_subfile (char *, char *);

static struct symbol *new_symbol (struct die_info *, struct type *,
                                  struct objfile *, const struct comp_unit_head *);

static void dwarf2_const_value (struct attribute *, struct symbol *,
                                struct objfile *, const struct comp_unit_head *);

static void dwarf2_const_value_data (struct attribute *attr,
                                     struct symbol *sym,
                                     int bits);

static struct type *die_type (struct die_info *, struct objfile *,
                              const struct comp_unit_head *);

static struct type *die_containing_type (struct die_info *, struct objfile *,
                                         const struct comp_unit_head *);

#if 0
static struct type *type_at_offset (unsigned int, struct objfile *);
#endif

static struct type *tag_type_to_type (struct die_info *, struct objfile *,
                                      const struct comp_unit_head *);

static void read_type_die (struct die_info *, struct objfile *,
                           const struct comp_unit_head *);

static void read_typedef (struct die_info *, struct objfile *,
                          const struct comp_unit_head *);

static void read_base_type (struct die_info *, struct objfile *);

static void read_file_scope (struct die_info *, struct objfile *,
                             const struct comp_unit_head *);

static void read_func_scope (struct die_info *, struct objfile *,
                             const struct comp_unit_head *);

static void read_lexical_block_scope (struct die_info *, struct objfile *,
                                      const struct comp_unit_head *);

static int dwarf2_get_pc_bounds (struct die_info *,
                                 CORE_ADDR *, CORE_ADDR *, struct objfile *,
                                 const struct comp_unit_head *);

static void dwarf2_add_field (struct field_info *, struct die_info *,
                              struct objfile *, const struct comp_unit_head *);

static void dwarf2_attach_fields_to_type (struct field_info *,
                                          struct type *, struct objfile *);

static void dwarf2_add_member_fn (struct field_info *,
                                  struct die_info *, struct type *,
                                  struct objfile *objfile,
                                  const struct comp_unit_head *);

static void dwarf2_attach_fn_fields_to_type (struct field_info *,
                                             struct type *, struct objfile *);

static void read_structure_scope (struct die_info *, struct objfile *,
                                  const struct comp_unit_head *);

static void read_common_block (struct die_info *, struct objfile *,
                               const struct comp_unit_head *);

static void read_namespace (struct die_info *die, struct objfile *objfile,
                            const struct comp_unit_head *cu_header);

static void read_enumeration (struct die_info *, struct objfile *,
                              const struct comp_unit_head *);

static struct type *dwarf_base_type (int, int, struct objfile *);

static CORE_ADDR decode_locdesc (struct dwarf_block *, struct objfile *,
                                 const struct comp_unit_head *);

static void read_array_type (struct die_info *, struct objfile *,
                             const struct comp_unit_head *);

static void read_tag_pointer_type (struct die_info *, struct objfile *,
                                   const struct comp_unit_head *);

static void read_tag_ptr_to_member_type (struct die_info *, struct objfile *,
                                         const struct comp_unit_head *);

static void read_tag_reference_type (struct die_info *, struct objfile *,
                                     const struct comp_unit_head *);

static void read_tag_const_type (struct die_info *, struct objfile *,
                                 const struct comp_unit_head *);

static void read_tag_volatile_type (struct die_info *, struct objfile *,
                                    const struct comp_unit_head *);

static void read_tag_string_type (struct die_info *, struct objfile *);

static void read_subroutine_type (struct die_info *, struct objfile *,
                                  const struct comp_unit_head *);

static struct die_info *read_comp_unit (char *, bfd *,
                                        const struct comp_unit_head *);

static void free_die_list (struct die_info *);

static struct cleanup *make_cleanup_free_die_list (struct die_info *);

static void process_die (struct die_info *, struct objfile *,
                         const struct comp_unit_head *);

static char *dwarf2_linkage_name (struct die_info *);

static char *dwarf2_name (struct die_info *die);

static struct die_info *dwarf2_extension (struct die_info *die);

static char *dwarf_tag_name (unsigned int);

static char *dwarf_attr_name (unsigned int);

static char *dwarf_form_name (unsigned int);

static char *dwarf_stack_op_name (unsigned int);

static char *dwarf_bool_name (unsigned int);

static char *dwarf_type_encoding_name (unsigned int);

#if 0
static char *dwarf_cfi_name (unsigned int);

struct die_info *copy_die (struct die_info *);
#endif

static struct die_info *sibling_die (struct die_info *);

static void dump_die (struct die_info *);

static void dump_die_list (struct die_info *);

static void store_in_ref_table (unsigned int, struct die_info *);

static void dwarf2_empty_hash_tables (void);

static unsigned int dwarf2_get_ref_die_offset (struct attribute *);

static struct die_info *follow_die_ref (unsigned int);

static struct type *dwarf2_fundamental_type (struct objfile *, int);

/* memory allocation interface */

static void dwarf2_free_tmp_obstack (void *);

static struct dwarf_block *dwarf_alloc_block (void);

static struct abbrev_info *dwarf_alloc_abbrev (void);

static struct die_info *dwarf_alloc_die (void);

static void initialize_cu_func_list (void);

static void add_to_cu_func_list (const char *, CORE_ADDR, CORE_ADDR);

static void dwarf_decode_macros (struct line_header *, unsigned int,
                                 char *, bfd *, const struct comp_unit_head *,
                                 struct objfile *);

static int attr_form_is_block (struct attribute *);

static void
dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym,
                             const struct comp_unit_head *,
                             struct objfile *objfile);

/* Try to locate the sections we need for DWARF 2 debugging
   information and return true if we have enough to do something.  */

int
dwarf2_has_info (bfd *abfd)
{
  dwarf_info_offset = 0;
  dwarf_abbrev_offset = 0;
  dwarf_line_offset = 0;
  dwarf_str_offset = 0;
  dwarf_macinfo_offset = 0;
  dwarf_frame_offset = 0;
  dwarf_eh_frame_offset = 0;
  dwarf_ranges_offset = 0;
  dwarf_loc_offset = 0;
  
  bfd_map_over_sections (abfd, dwarf2_locate_sections, NULL);
  if (dwarf_info_offset && dwarf_abbrev_offset)
    {
      return 1;
    }
  else
    {
      return 0;
    }
}

/* This function is mapped across the sections and remembers the
   offset and size of each of the debugging sections we are interested
   in.  */

static void
dwarf2_locate_sections (bfd *ignore_abfd, asection *sectp, void *ignore_ptr)
{
  if (STREQ (sectp->name, INFO_SECTION))
    {
      dwarf_info_offset = sectp->filepos;
      dwarf_info_size = bfd_get_section_size_before_reloc (sectp);
      dwarf_info_section = sectp;
    }
  else if (STREQ (sectp->name, ABBREV_SECTION))
    {
      dwarf_abbrev_offset = sectp->filepos;
      dwarf_abbrev_size = bfd_get_section_size_before_reloc (sectp);
      dwarf_abbrev_section = sectp;
    }
  else if (STREQ (sectp->name, LINE_SECTION))
    {
      dwarf_line_offset = sectp->filepos;
      dwarf_line_size = bfd_get_section_size_before_reloc (sectp);
      dwarf_line_section = sectp;
    }
  else if (STREQ (sectp->name, PUBNAMES_SECTION))
    {
      dwarf_pubnames_offset = sectp->filepos;
      dwarf_pubnames_size = bfd_get_section_size_before_reloc (sectp);
      dwarf_pubnames_section = sectp;
    }
  else if (STREQ (sectp->name, ARANGES_SECTION))
    {
      dwarf_aranges_offset = sectp->filepos;
      dwarf_aranges_size = bfd_get_section_size_before_reloc (sectp);
      dwarf_aranges_section = sectp;
    }
  else if (STREQ (sectp->name, LOC_SECTION))
    {
      dwarf_loc_offset = sectp->filepos;
      dwarf_loc_size = bfd_get_section_size_before_reloc (sectp);
      dwarf_loc_section = sectp;
    }
  else if (STREQ (sectp->name, MACINFO_SECTION))
    {
      dwarf_macinfo_offset = sectp->filepos;
      dwarf_macinfo_size = bfd_get_section_size_before_reloc (sectp);
      dwarf_macinfo_section = sectp;
    }
  else if (STREQ (sectp->name, STR_SECTION))
    {
      dwarf_str_offset = sectp->filepos;
      dwarf_str_size = bfd_get_section_size_before_reloc (sectp);
      dwarf_str_section = sectp;
    }
  else if (STREQ (sectp->name, FRAME_SECTION))
    {
      dwarf_frame_offset = sectp->filepos;
      dwarf_frame_size = bfd_get_section_size_before_reloc (sectp);
      dwarf_frame_section = sectp;
    }
  else if (STREQ (sectp->name, EH_FRAME_SECTION))
    {
      flagword aflag = bfd_get_section_flags (ignore_abfd, sectp);
      if (aflag & SEC_HAS_CONTENTS)
        {
          dwarf_eh_frame_offset = sectp->filepos;
          dwarf_eh_frame_size = bfd_get_section_size_before_reloc (sectp);
          dwarf_eh_frame_section = sectp;
        }
    }
  else if (STREQ (sectp->name, RANGES_SECTION))
    {
      dwarf_ranges_offset = sectp->filepos;
      dwarf_ranges_size = bfd_get_section_size_before_reloc (sectp);
      dwarf_ranges_section = sectp;
    }
}

/* Build a partial symbol table.  */

void
dwarf2_build_psymtabs (struct objfile *objfile, int mainline)
{

  /* We definitely need the .debug_info and .debug_abbrev sections */

  dwarf_info_buffer = dwarf2_read_section (objfile,
                                           dwarf_info_offset,
                                           dwarf_info_size,
                                           dwarf_info_section);
  dwarf_abbrev_buffer = dwarf2_read_section (objfile,
                                             dwarf_abbrev_offset,
                                             dwarf_abbrev_size,
                                             dwarf_abbrev_section);

  if (dwarf_line_offset)
    dwarf_line_buffer = dwarf2_read_section (objfile,
                                             dwarf_line_offset,
                                             dwarf_line_size,
                                             dwarf_line_section);
  else
    dwarf_line_buffer = NULL;

  if (dwarf_str_offset)
    dwarf_str_buffer = dwarf2_read_section (objfile,
                                            dwarf_str_offset,
                                            dwarf_str_size,
                                            dwarf_str_section);
  else
    dwarf_str_buffer = NULL;

  if (dwarf_macinfo_offset)
    dwarf_macinfo_buffer = dwarf2_read_section (objfile,
                                                dwarf_macinfo_offset,
                                                dwarf_macinfo_size,
                                                dwarf_macinfo_section);
  else
    dwarf_macinfo_buffer = NULL;

  if (dwarf_ranges_offset)
    dwarf_ranges_buffer = dwarf2_read_section (objfile,
                                               dwarf_ranges_offset,
                                               dwarf_ranges_size,
                                               dwarf_ranges_section);
  else
    dwarf_ranges_buffer = NULL;

  if (dwarf_loc_offset)
    dwarf_loc_buffer = dwarf2_read_section (objfile,
                                            dwarf_loc_offset,
                                            dwarf_loc_size,
                                            dwarf_loc_section);
  else
    dwarf_loc_buffer = NULL;

  if (mainline
      || (objfile->global_psymbols.size == 0
          && objfile->static_psymbols.size == 0))
    {
      init_psymbol_list (objfile, 1024);
    }

#if 0
  if (dwarf_aranges_offset && dwarf_pubnames_offset)
    {
      /* Things are significantly easier if we have .debug_aranges and
         .debug_pubnames sections */

      dwarf2_build_psymtabs_easy (objfile, mainline);
    }
  else
#endif
    /* only test this case for now */
    {
      /* In this case we have to work a bit harder */
      dwarf2_build_psymtabs_hard (objfile, mainline);
    }
}

#if 0
/* Build the partial symbol table from the information in the
   .debug_pubnames and .debug_aranges sections.  */

static void
dwarf2_build_psymtabs_easy (struct objfile *objfile, int mainline)
{
  bfd *abfd = objfile->obfd;
  char *aranges_buffer, *pubnames_buffer;
  char *aranges_ptr, *pubnames_ptr;
  unsigned int entry_length, version, info_offset, info_size;

  pubnames_buffer = dwarf2_read_section (objfile,
                                         dwarf_pubnames_offset,
                                         dwarf_pubnames_size,
                                         dwarf_pubnames_section);
  pubnames_ptr = pubnames_buffer;
  while ((pubnames_ptr - pubnames_buffer) < dwarf_pubnames_size)
    {
      struct comp_unit_head cu_header;
      int bytes_read;

      entry_length = read_initial_length (abfd, pubnames_ptr, &cu_header,
                                         &bytes_read);
      pubnames_ptr += bytes_read;
      version = read_1_byte (abfd, pubnames_ptr);
      pubnames_ptr += 1;
      info_offset = read_4_bytes (abfd, pubnames_ptr);
      pubnames_ptr += 4;
      info_size = read_4_bytes (abfd, pubnames_ptr);
      pubnames_ptr += 4;
    }

  aranges_buffer = dwarf2_read_section (objfile,
                                        dwarf_aranges_offset,
                                        dwarf_aranges_size,
                                        dwarf_aranges_section);

}
#endif

/* Read in the comp unit header information from the debug_info at
   info_ptr. */

static char *
read_comp_unit_head (struct comp_unit_head *cu_header,
                     char *info_ptr, bfd *abfd)
{
  int signed_addr;
  int bytes_read;
  cu_header->length = read_initial_length (abfd, info_ptr, cu_header,
                                           &bytes_read);
  info_ptr += bytes_read;
  cu_header->version = read_2_bytes (abfd, info_ptr);
  info_ptr += 2;
  cu_header->abbrev_offset = read_offset (abfd, info_ptr, cu_header,
                                          &bytes_read);
  info_ptr += bytes_read;
  cu_header->addr_size = read_1_byte (abfd, info_ptr);
  info_ptr += 1;
  signed_addr = bfd_get_sign_extend_vma (abfd);
  if (signed_addr < 0)
    internal_error (__FILE__, __LINE__,
                    "read_comp_unit_head: dwarf from non elf file");
  cu_header->signed_addr_p = signed_addr;
  return info_ptr;
}

/* Build the partial symbol table by doing a quick pass through the
   .debug_info and .debug_abbrev sections.  */

static void
dwarf2_build_psymtabs_hard (struct objfile *objfile, int mainline)
{
  /* Instead of reading this into a big buffer, we should probably use
     mmap()  on architectures that support it. (FIXME) */
  bfd *abfd = objfile->obfd;
  char *info_ptr, *abbrev_ptr;
  char *beg_of_comp_unit;
  struct partial_die_info comp_unit_die;
  struct partial_symtab *pst;
  struct cleanup *back_to;
  CORE_ADDR lowpc, highpc;

  info_ptr = dwarf_info_buffer;
  abbrev_ptr = dwarf_abbrev_buffer;

  /* We use dwarf2_tmp_obstack for objects that don't need to survive
     the partial symbol scan, like attribute values.

     We could reduce our peak memory consumption during partial symbol
     table construction by freeing stuff from this obstack more often
     --- say, after processing each compilation unit, or each die ---
     but it turns out that this saves almost nothing.  For an
     executable with 11Mb of Dwarf 2 data, I found about 64k allocated
     on dwarf2_tmp_obstack.  Some investigation showed:

     1) 69% of the attributes used forms DW_FORM_addr, DW_FORM_data*,
        DW_FORM_flag, DW_FORM_[su]data, and DW_FORM_ref*.  These are
        all fixed-length values not requiring dynamic allocation.

     2) 30% of the attributes used the form DW_FORM_string.  For
        DW_FORM_string, read_attribute simply hands back a pointer to
        the null-terminated string in dwarf_info_buffer, so no dynamic
        allocation is needed there either.

     3) The remaining 1% of the attributes all used DW_FORM_block1.
        75% of those were DW_AT_frame_base location lists for
        functions; the rest were DW_AT_location attributes, probably
        for the global variables.

     Anyway, what this all means is that the memory the dwarf2
     reader uses as temporary space reading partial symbols is about
     0.5% as much as we use for dwarf_*_buffer.  That's noise.  */

  obstack_init (&dwarf2_tmp_obstack);
  back_to = make_cleanup (dwarf2_free_tmp_obstack, NULL);

  /* Since the objects we're extracting from dwarf_info_buffer vary in
     length, only the individual functions to extract them (like
     read_comp_unit_head and read_partial_die) can really know whether
     the buffer is large enough to hold another complete object.

     At the moment, they don't actually check that.  If
     dwarf_info_buffer holds just one extra byte after the last
     compilation unit's dies, then read_comp_unit_head will happily
     read off the end of the buffer.  read_partial_die is similarly
     casual.  Those functions should be fixed.

     For this loop condition, simply checking whether there's any data
     left at all should be sufficient.  */
  while (info_ptr < dwarf_info_buffer + dwarf_info_size)
    {
      struct comp_unit_head cu_header;
      beg_of_comp_unit = info_ptr;
      info_ptr = read_comp_unit_head (&cu_header, info_ptr, abfd);

      if (cu_header.version != 2)
        {
          error ("Dwarf Error: wrong version in compilation unit header (is %d, should be %d) [in module %s]", cu_header.version, 2, bfd_get_filename (abfd));
          return;
        }
      if (cu_header.abbrev_offset >= dwarf_abbrev_size)
        {
          error ("Dwarf Error: bad offset (0x%lx) in compilation unit header (offset 0x%lx + 6) [in module %s]",
                 (long) cu_header.abbrev_offset,
                 (long) (beg_of_comp_unit - dwarf_info_buffer),
                 bfd_get_filename (abfd));
          return;
        }
      if (beg_of_comp_unit + cu_header.length + cu_header.initial_length_size
          > dwarf_info_buffer + dwarf_info_size)
        {
          error ("Dwarf Error: bad length (0x%lx) in compilation unit header (offset 0x%lx + 0) [in module %s]",
                 (long) cu_header.length,
                 (long) (beg_of_comp_unit - dwarf_info_buffer),
                 bfd_get_filename (abfd));
          return;
        }
      /* Complete the cu_header */
      cu_header.offset = beg_of_comp_unit - dwarf_info_buffer;
      cu_header.first_die_ptr = info_ptr;
      cu_header.cu_head_ptr = beg_of_comp_unit;

      /* Read the abbrevs for this compilation unit into a table */
      dwarf2_read_abbrevs (abfd, &cu_header);
      make_cleanup (dwarf2_empty_abbrev_table, cu_header.dwarf2_abbrevs);

      /* Read the compilation unit die */
      info_ptr = read_partial_die (&comp_unit_die, abfd, info_ptr,
                                   &cu_header);

      /* Set the language we're debugging */
      set_cu_language (comp_unit_die.language);

      /* Allocate a new partial symbol table structure */
      pst = start_psymtab_common (objfile, objfile->section_offsets,
                                  comp_unit_die.name ? comp_unit_die.name : "",
                                  comp_unit_die.lowpc,
                                  objfile->global_psymbols.next,
                                  objfile->static_psymbols.next);

      pst->read_symtab_private = (char *)
        obstack_alloc (&objfile->psymbol_obstack, sizeof (struct dwarf2_pinfo));
      cu_header_offset = beg_of_comp_unit - dwarf_info_buffer;
      DWARF_INFO_BUFFER (pst) = dwarf_info_buffer;
      DWARF_INFO_OFFSET (pst) = beg_of_comp_unit - dwarf_info_buffer;
      DWARF_ABBREV_BUFFER (pst) = dwarf_abbrev_buffer;
      DWARF_ABBREV_SIZE (pst) = dwarf_abbrev_size;
      DWARF_LINE_BUFFER (pst) = dwarf_line_buffer;
      DWARF_LINE_SIZE (pst) = dwarf_line_size;
      DWARF_STR_BUFFER (pst) = dwarf_str_buffer;
      DWARF_STR_SIZE (pst) = dwarf_str_size;
      DWARF_MACINFO_BUFFER (pst) = dwarf_macinfo_buffer;
      DWARF_MACINFO_SIZE (pst) = dwarf_macinfo_size;
      DWARF_RANGES_BUFFER (pst) = dwarf_ranges_buffer;
      DWARF_RANGES_SIZE (pst) = dwarf_ranges_size;
      DWARF_LOC_BUFFER (pst) = dwarf_loc_buffer;
      DWARF_LOC_SIZE (pst) = dwarf_loc_size;
      baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));

      /* Store the function that reads in the rest of the symbol table */
      pst->read_symtab = dwarf2_psymtab_to_symtab;

      /* Check if comp unit has_children.
         If so, read the rest of the partial symbols from this comp unit.
         If not, there's no more debug_info for this comp unit. */
      if (comp_unit_die.has_children)
        {
          info_ptr = scan_partial_symbols (info_ptr, objfile, &lowpc, &highpc,
                                           &cu_header);

          /* If the compilation unit didn't have an explicit address range,
             then use the information extracted from its child dies.  */
          if (! comp_unit_die.has_pc_info)
            {
              comp_unit_die.lowpc = lowpc;
              comp_unit_die.highpc = highpc;
            }
        }
      pst->textlow = comp_unit_die.lowpc + baseaddr;
      pst->texthigh = comp_unit_die.highpc + baseaddr;

      pst->n_global_syms = objfile->global_psymbols.next -
        (objfile->global_psymbols.list + pst->globals_offset);
      pst->n_static_syms = objfile->static_psymbols.next -
        (objfile->static_psymbols.list + pst->statics_offset);
      sort_pst_symbols (pst);

      /* If there is already a psymtab or symtab for a file of this
         name, remove it. (If there is a symtab, more drastic things
         also happen.) This happens in VxWorks.  */
      free_named_symtabs (pst->filename);

      info_ptr = beg_of_comp_unit + cu_header.length 
                                  + cu_header.initial_length_size;
    }
  do_cleanups (back_to);
}

/* Read in all interesting dies to the end of the compilation unit.  */

static char *
scan_partial_symbols (char *info_ptr, struct objfile *objfile,
                      CORE_ADDR *lowpc, CORE_ADDR *highpc,
                      const struct comp_unit_head *cu_header)
{
  bfd *abfd = objfile->obfd;
  struct partial_die_info pdi;

  /* This function is called after we've read in the comp_unit_die in
     order to read its children.  We start the nesting level at 1 since
     we have pushed 1 level down in order to read the comp unit's children.
     The comp unit itself is at level 0, so we stop reading when we pop
     back to that level. */

  int nesting_level = 1;

  /* We only want to read in symbols corresponding to variables or
     other similar objects that are global or static.  Normally, these
     are all children of the DW_TAG_compile_unit die, so are all at
     level 1.  But C++ namespaces give ries to DW_TAG_namespace dies
     whose children are global objects.  So we keep track of what
     level we currently think of as referring to file scope; this
     should always equal 1 plus the number of namespaces that we are
     currently nested within.  */
  
  int file_scope_level = 1;

  *lowpc = ((CORE_ADDR) -1);
  *highpc = ((CORE_ADDR) 0);

  while (nesting_level)
    {
      info_ptr = read_partial_die (&pdi, abfd, info_ptr, cu_header);

      /* Anonymous namespaces have no name but are interesting.  */

      if (pdi.name != NULL || pdi.tag == DW_TAG_namespace)
        {
          switch (pdi.tag)
            {
            case DW_TAG_subprogram:
              if (pdi.has_pc_info)
                {
                  if (pdi.lowpc < *lowpc)
                    {
                      *lowpc = pdi.lowpc;
                    }
                  if (pdi.highpc > *highpc)
                    {
                      *highpc = pdi.highpc;
                    }
                  if ((pdi.is_external || nesting_level == file_scope_level)
                      && !pdi.is_declaration)
                    {
                      add_partial_symbol (&pdi, objfile, cu_header);
                    }
                }
              break;
            case DW_TAG_variable:
            case DW_TAG_typedef:
            case DW_TAG_class_type:
            case DW_TAG_structure_type:
            case DW_TAG_union_type:
            case DW_TAG_enumeration_type:
              if ((pdi.is_external || nesting_level == file_scope_level)
                  && !pdi.is_declaration)
                {
                  add_partial_symbol (&pdi, objfile, cu_header);
                }
              break;
            case DW_TAG_enumerator:
              /* File scope enumerators are added to the partial
                 symbol table.  They're children of the enumeration
                 type die, so they occur at a level one higher than we
                 normally look for.  */
              if (nesting_level == file_scope_level + 1)
                add_partial_symbol (&pdi, objfile, cu_header);
              break;
            case DW_TAG_base_type:
              /* File scope base type definitions are added to the partial
                 symbol table.  */
              if (nesting_level == file_scope_level)
                add_partial_symbol (&pdi, objfile, cu_header);
              break;
            case DW_TAG_namespace:
              /* FIXME: carlton/2002-10-16: we're not yet doing
                 anything useful with this, but for now make sure that
                 these tags at least don't cause us to miss any
                 important symbols.  */
              if (pdi.has_children)
                file_scope_level++;
            default:
              break;
            }
        }

      /* If the die has a sibling, skip to the sibling.  Do not skip
         enumeration types, we want to record their enumerators.  Do
         not skip namespaces, we want to record symbols inside
         them.  */
      if (pdi.sibling
          && pdi.tag != DW_TAG_enumeration_type
          && pdi.tag != DW_TAG_namespace)
        {
          info_ptr = pdi.sibling;
        }
      else if (pdi.has_children)
        {
          /* Die has children, but either the optional DW_AT_sibling
             attribute is missing or we want to look at them.  */
          nesting_level++;
        }

      if (pdi.tag == 0)
        {
          nesting_level--;
          /* If this is the end of a DW_TAG_namespace entry, then
             decrease the file_scope_level, too.  */
          if (nesting_level < file_scope_level)
            {
              file_scope_level--;
              gdb_assert (nesting_level == file_scope_level);
            }
        }
    }

  /* If we didn't find a lowpc, set it to highpc to avoid complaints
     from `maint check'.  */
  if (*lowpc == ((CORE_ADDR) -1))
    *lowpc = *highpc;
  return info_ptr;
}

static void
add_partial_symbol (struct partial_die_info *pdi, struct objfile *objfile,
                    const struct comp_unit_head *cu_header)
{
  CORE_ADDR addr = 0;

  switch (pdi->tag)
    {
    case DW_TAG_subprogram:
      if (pdi->is_external)
        {
          /*prim_record_minimal_symbol (pdi->name, pdi->lowpc + baseaddr,
             mst_text, objfile); */
          add_psymbol_to_list (pdi->name, strlen (pdi->name),
                               VAR_DOMAIN, LOC_BLOCK,
                               &objfile->global_psymbols,
                            0, pdi->lowpc + baseaddr, cu_language, objfile);
        }
      else
        {
          /*prim_record_minimal_symbol (pdi->name, pdi->lowpc + baseaddr,
             mst_file_text, objfile); */
          add_psymbol_to_list (pdi->name, strlen (pdi->name),
                               VAR_DOMAIN, LOC_BLOCK,
                               &objfile->static_psymbols,
                            0, pdi->lowpc + baseaddr, cu_language, objfile);
        }
      break;
    case DW_TAG_variable:
      if (pdi->is_external)
        {
          /* Global Variable.
             Don't enter into the minimal symbol tables as there is
             a minimal symbol table entry from the ELF symbols already.
             Enter into partial symbol table if it has a location
             descriptor or a type.
             If the location descriptor is missing, new_symbol will create
             a LOC_UNRESOLVED symbol, the address of the variable will then
             be determined from the minimal symbol table whenever the variable
             is referenced.
             The address for the partial symbol table entry is not
             used by GDB, but it comes in handy for debugging partial symbol
             table building.  */

          if (pdi->locdesc)
            addr = decode_locdesc (pdi->locdesc, objfile, cu_header);
          if (pdi->locdesc || pdi->has_type)
            add_psymbol_to_list (pdi->name, strlen (pdi->name),
                                 VAR_DOMAIN, LOC_STATIC,
                                 &objfile->global_psymbols,
                                 0, addr + baseaddr, cu_language, objfile);
        }
      else
        {
          /* Static Variable. Skip symbols without location descriptors.  */
          if (pdi->locdesc == NULL)
            return;
          addr = decode_locdesc (pdi->locdesc, objfile, cu_header);
          /*prim_record_minimal_symbol (pdi->name, addr + baseaddr,
             mst_file_data, objfile); */
          add_psymbol_to_list (pdi->name, strlen (pdi->name),
                               VAR_DOMAIN, LOC_STATIC,
                               &objfile->static_psymbols,
                               0, addr + baseaddr, cu_language, objfile);
        }
      break;
    case DW_TAG_typedef:
    case DW_TAG_base_type:
      add_psymbol_to_list (pdi->name, strlen (pdi->name),
                           VAR_DOMAIN, LOC_TYPEDEF,
                           &objfile->static_psymbols,
                           0, (CORE_ADDR) 0, cu_language, objfile);
      break;
    case DW_TAG_class_type:
    case DW_TAG_structure_type:
    case DW_TAG_union_type:
    case DW_TAG_enumeration_type:
      /* Skip aggregate types without children, these are external
         references.  */
      if (pdi->has_children == 0)
        return;
      add_psymbol_to_list (pdi->name, strlen (pdi->name),
                           STRUCT_DOMAIN, LOC_TYPEDEF,
                           &objfile->static_psymbols,
                           0, (CORE_ADDR) 0, cu_language, objfile);

      if (cu_language == language_cplus)
        {
          /* For C++, these implicitly act as typedefs as well. */
          add_psymbol_to_list (pdi->name, strlen (pdi->name),
                               VAR_DOMAIN, LOC_TYPEDEF,
                               &objfile->static_psymbols,
                               0, (CORE_ADDR) 0, cu_language, objfile);
        }
      break;
    case DW_TAG_enumerator:
      add_psymbol_to_list (pdi->name, strlen (pdi->name),
                           VAR_DOMAIN, LOC_CONST,
                           &objfile->static_psymbols,
                           0, (CORE_ADDR) 0, cu_language, objfile);
      break;
    default:
      break;
    }
}

/* Expand this partial symbol table into a full symbol table.  */

static void
dwarf2_psymtab_to_symtab (struct partial_symtab *pst)
{
  /* FIXME: This is barely more than a stub.  */
  if (pst != NULL)
    {
      if (pst->readin)
        {
          warning ("bug: psymtab for %s is already read in.", pst->filename);
        }
      else
        {
          if (info_verbose)
            {
              printf_filtered ("Reading in symbols for %s...", pst->filename);
              gdb_flush (gdb_stdout);
            }

          psymtab_to_symtab_1 (pst);

          /* Finish up the debug error message.  */
          if (info_verbose)
            printf_filtered ("done.\n");
        }
    }
}

static void
psymtab_to_symtab_1 (struct partial_symtab *pst)
{
  struct objfile *objfile = pst->objfile;
  bfd *abfd = objfile->obfd;
  struct comp_unit_head cu_header;
  struct die_info *dies;
  unsigned long offset;
  CORE_ADDR lowpc, highpc;
  struct die_info *child_die;
  char *info_ptr;
  struct symtab *symtab;
  struct cleanup *back_to;
  struct attribute *attr;

  /* Set local variables from the partial symbol table info.  */
  offset = DWARF_INFO_OFFSET (pst);
  dwarf_info_buffer = DWARF_INFO_BUFFER (pst);
  dwarf_abbrev_buffer = DWARF_ABBREV_BUFFER (pst);
  dwarf_abbrev_size = DWARF_ABBREV_SIZE (pst);
  dwarf_line_buffer = DWARF_LINE_BUFFER (pst);
  dwarf_line_size = DWARF_LINE_SIZE (pst);
  dwarf_str_buffer = DWARF_STR_BUFFER (pst);
  dwarf_str_size = DWARF_STR_SIZE (pst);
  dwarf_macinfo_buffer = DWARF_MACINFO_BUFFER (pst);
  dwarf_macinfo_size = DWARF_MACINFO_SIZE (pst);
  dwarf_ranges_buffer = DWARF_RANGES_BUFFER (pst);
  dwarf_ranges_size = DWARF_RANGES_SIZE (pst);
  dwarf_loc_buffer = DWARF_LOC_BUFFER (pst);
  dwarf_loc_size = DWARF_LOC_SIZE (pst);
  baseaddr = ANOFFSET (pst->section_offsets, SECT_OFF_TEXT (objfile));
  cu_header_offset = offset;
  info_ptr = dwarf_info_buffer + offset;

  obstack_init (&dwarf2_tmp_obstack);
  back_to = make_cleanup (dwarf2_free_tmp_obstack, NULL);

  buildsym_init ();
  make_cleanup (really_free_pendings, NULL);

  /* read in the comp_unit header  */
  info_ptr = read_comp_unit_head (&cu_header, info_ptr, abfd);

  /* Read the abbrevs for this compilation unit  */
  dwarf2_read_abbrevs (abfd, &cu_header);
  make_cleanup (dwarf2_empty_abbrev_table, cu_header.dwarf2_abbrevs);

  dies = read_comp_unit (info_ptr, abfd, &cu_header);

  make_cleanup_free_die_list (dies);

  /* Find the base address of the compilation unit for range lists and
     location lists.  It will normally be specified by DW_AT_low_pc.
     In DWARF-3 draft 4, the base address could be overridden by
     DW_AT_entry_pc.  It's been removed, but GCC still uses this for
     compilation units with discontinuous ranges.  */

  cu_header.base_known = 0;
  cu_header.base_address = 0;

  attr = dwarf_attr (dies, DW_AT_entry_pc);
  if (attr)
    {
      cu_header.base_address = DW_ADDR (attr);
      cu_header.base_known = 1;
    }
  else
    {
      attr = dwarf_attr (dies, DW_AT_low_pc);
      if (attr)
        {
          cu_header.base_address = DW_ADDR (attr);
          cu_header.base_known = 1;
        }
    }

  /* Do line number decoding in read_file_scope () */
  process_die (dies, objfile, &cu_header);

  if (!dwarf2_get_pc_bounds (dies, &lowpc, &highpc, objfile, &cu_header))
    {
      /* Some compilers don't define a DW_AT_high_pc attribute for
         the compilation unit.   If the DW_AT_high_pc is missing,
         synthesize it, by scanning the DIE's below the compilation unit.  */
      highpc = 0;
      if (dies->has_children)
        {
          child_die = dies->next;
          while (child_die && child_die->tag)
            {
              if (child_die->tag == DW_TAG_subprogram)
                {
                  CORE_ADDR low, high;

                  if (dwarf2_get_pc_bounds (child_die, &low, &high,
                                            objfile, &cu_header))
                    {
                      highpc = max (highpc, high);
                    }
                }
              child_die = sibling_die (child_die);
            }
        }
    }
  symtab = end_symtab (highpc + baseaddr, objfile, SECT_OFF_TEXT (objfile));

  /* Set symtab language to language from DW_AT_language.
     If the compilation is from a C file generated by language preprocessors,
     do not set the language if it was already deduced by start_subfile.  */
  if (symtab != NULL
      && !(cu_language == language_c && symtab->language != language_c))
    {
      symtab->language = cu_language;
    }
  pst->symtab = symtab;
  pst->readin = 1;

  do_cleanups (back_to);
}

/* Process a die and its children.  */

static void
process_die (struct die_info *die, struct objfile *objfile,
             const struct comp_unit_head *cu_header)
{
  switch (die->tag)
    {
    case DW_TAG_padding:
      break;
    case DW_TAG_compile_unit:
      read_file_scope (die, objfile, cu_header);
      break;
    case DW_TAG_subprogram:
      read_subroutine_type (die, objfile, cu_header);
      read_func_scope (die, objfile, cu_header);
      break;
    case DW_TAG_inlined_subroutine:
      /* FIXME:  These are ignored for now.
         They could be used to set breakpoints on all inlined instances
         of a function and make GDB `next' properly over inlined functions.  */
      break;
    case DW_TAG_lexical_block:
    case DW_TAG_try_block:
    case DW_TAG_catch_block:
      read_lexical_block_scope (die, objfile, cu_header);
      break;
    case DW_TAG_class_type:
    case DW_TAG_structure_type:
    case DW_TAG_union_type:
      read_structure_scope (die, objfile, cu_header);
      break;
    case DW_TAG_enumeration_type:
      read_enumeration (die, objfile, cu_header);
      break;
    case DW_TAG_subroutine_type:
      read_subroutine_type (die, objfile, cu_header);
      break;
    case DW_TAG_array_type:
      read_array_type (die, objfile, cu_header);
      break;
    case DW_TAG_pointer_type:
      read_tag_pointer_type (die, objfile, cu_header);
      break;
    case DW_TAG_ptr_to_member_type:
      read_tag_ptr_to_member_type (die, objfile, cu_header);
      break;
    case DW_TAG_reference_type:
      read_tag_reference_type (die, objfile, cu_header);
      break;
    case DW_TAG_string_type:
      read_tag_string_type (die, objfile);
      break;
    case DW_TAG_base_type:
      read_base_type (die, objfile);
      if (dwarf_attr (die, DW_AT_name))
        {
          /* Add a typedef symbol for the base type definition.  */
          new_symbol (die, die->type, objfile, cu_header);
        }
      break;
    case DW_TAG_common_block:
      read_common_block (die, objfile, cu_header);
      break;
    case DW_TAG_common_inclusion:
      break;
    case DW_TAG_namespace:
      if (!processing_has_namespace_info)
        {
          processing_has_namespace_info = 1;
          processing_current_namespace = "";
        }
      read_namespace (die, objfile, cu_header);
      break;
    case DW_TAG_imported_declaration:
    case DW_TAG_imported_module:
      /* FIXME: carlton/2002-10-16: Eventually, we should use the
         information contained in these.  DW_TAG_imported_declaration
         dies shouldn't have children; DW_TAG_imported_module dies
         shouldn't in the C++ case, but conceivably could in the
         Fortran case, so we'll have to replace this gdb_assert if
         Fortran compilers start generating that info.  */
      if (!processing_has_namespace_info)
        {
          processing_has_namespace_info = 1;
          processing_current_namespace = "";
        }
      gdb_assert (!die->has_children);
      break;
    default:
      new_symbol (die, NULL, objfile, cu_header);
      break;
    }
}

static void
initialize_cu_func_list (void)
{
  cu_first_fn = cu_last_fn = cu_cached_fn = NULL;
}

static void
read_file_scope (struct die_info *die, struct objfile *objfile,
                 const struct comp_unit_head *cu_header)
{
  struct cleanup *back_to = make_cleanup (null_cleanup, 0);
  CORE_ADDR lowpc = ((CORE_ADDR) -1);
  CORE_ADDR highpc = ((CORE_ADDR) 0);
  struct attribute *attr;
  char *name = "<unknown>";
  char *comp_dir = NULL;
  struct die_info *child_die;
  bfd *abfd = objfile->obfd;
  struct line_header *line_header = 0;

  if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, objfile, cu_header))
    {
      if (die->has_children)
        {
          child_die = die->next;
          while (child_die && child_die->tag)
            {
              if (child_die->tag == DW_TAG_subprogram)
                {
                  CORE_ADDR low, high;

                  if (dwarf2_get_pc_bounds (child_die, &low, &high,
                                            objfile, cu_header))
                    {
                      lowpc = min (lowpc, low);
                      highpc = max (highpc, high);
                    }
                }
              child_die = sibling_die (child_die);
            }
        }
    }

  /* If we didn't find a lowpc, set it to highpc to avoid complaints
     from finish_block.  */
  if (lowpc == ((CORE_ADDR) -1))
    lowpc = highpc;
  lowpc += baseaddr;
  highpc += baseaddr;

  attr = dwarf_attr (die, DW_AT_name);
  if (attr)
    {
      name = DW_STRING (attr);
    }
  attr = dwarf_attr (die, DW_AT_comp_dir);
  if (attr)
    {
      comp_dir = DW_STRING (attr);
      if (comp_dir)
        {
          /* Irix 6.2 native cc prepends <machine>.: to the compilation
             directory, get rid of it.  */
          char *cp = strchr (comp_dir, ':');

          if (cp && cp != comp_dir && cp[-1] == '.' && cp[1] == '/')
            comp_dir = cp + 1;
        }
    }

  if (objfile->ei.entry_point >= lowpc &&
      objfile->ei.entry_point < highpc)
    {
      objfile->ei.entry_file_lowpc = lowpc;
      objfile->ei.entry_file_highpc = highpc;
    }

  attr = dwarf_attr (die, DW_AT_language);
  if (attr)
    {
      set_cu_language (DW_UNSND (attr));
    }

  /* We assume that we're processing GCC output. */
  processing_gcc_compilation = 2;
#if 0
  /* FIXME:Do something here.  */
  if (dip->at_producer != NULL)
    {
      handle_producer (dip->at_producer);
    }
#endif

  /* The compilation unit may be in a different language or objfile,
     zero out all remembered fundamental types.  */
  memset (ftypes, 0, FT_NUM_MEMBERS * sizeof (struct type *));

  start_symtab (name, comp_dir, lowpc);
  record_debugformat ("DWARF 2");

  initialize_cu_func_list ();

  /* Process all dies in compilation unit.  */
  if (die->has_children)
    {
      child_die = die->next;
      while (child_die && child_die->tag)
        {
          process_die (child_die, objfile, cu_header);
          child_die = sibling_die (child_die);
        }
    }

  /* Decode line number information if present.  */
  attr = dwarf_attr (die, DW_AT_stmt_list);
  if (attr)
    {
      unsigned int line_offset = DW_UNSND (attr);
      line_header = dwarf_decode_line_header (line_offset,
                                              abfd, cu_header);
      if (line_header)
        {
          make_cleanup ((make_cleanup_ftype *) free_line_header,
                        (void *) line_header);
          dwarf_decode_lines (line_header, comp_dir, abfd, cu_header);
        }
    }

  /* Decode macro information, if present.  Dwarf 2 macro information
     refers to information in the line number info statement program
     header, so we can only read it if we've read the header
     successfully.  */
  attr = dwarf_attr (die, DW_AT_macro_info);
  if (attr && line_header)
    {
      unsigned int macro_offset = DW_UNSND (attr);
      dwarf_decode_macros (line_header, macro_offset,
                           comp_dir, abfd, cu_header, objfile);
    }
  do_cleanups (back_to);
}

static void
add_to_cu_func_list (const char *name, CORE_ADDR lowpc, CORE_ADDR highpc)
{
  struct function_range *thisfn;

  thisfn = (struct function_range *)
    obstack_alloc (&dwarf2_tmp_obstack, sizeof (struct function_range));
  thisfn->name = name;
  thisfn->lowpc = lowpc;
  thisfn->highpc = highpc;
  thisfn->seen_line = 0;
  thisfn->next = NULL;

  if (cu_last_fn == NULL)
      cu_first_fn = thisfn;
  else
      cu_last_fn->next = thisfn;

  cu_last_fn = thisfn;
}

static void
read_func_scope (struct die_info *die, struct objfile *objfile,
                 const struct comp_unit_head *cu_header)
{
  register struct context_stack *new;
  CORE_ADDR lowpc;
  CORE_ADDR highpc;
  struct die_info *child_die;
  struct attribute *attr;
  char *name;

  name = dwarf2_linkage_name (die);

  /* Ignore functions with missing or empty names and functions with
     missing or invalid low and high pc attributes.  */
  if (name == NULL || !dwarf2_get_pc_bounds (die, &lowpc, &highpc, objfile, cu_header))
    return;

  lowpc += baseaddr;
  highpc += baseaddr;

  /* Record the function range for dwarf_decode_lines.  */
  add_to_cu_func_list (name, lowpc, highpc);

  if (objfile->ei.entry_point >= lowpc &&
      objfile->ei.entry_point < highpc)
    {
      objfile->ei.entry_func_lowpc = lowpc;
      objfile->ei.entry_func_highpc = highpc;
    }

  /* Decode DW_AT_frame_base location descriptor if present, keep result
     for DW_OP_fbreg operands in decode_locdesc.  */
  frame_base_reg = -1;
  frame_base_offset = 0;
  attr = dwarf_attr (die, DW_AT_frame_base);
  if (attr)
    {
      CORE_ADDR addr;

      /* Support the .debug_loc offsets */
      if (attr_form_is_block (attr))
        {
          addr = decode_locdesc (DW_BLOCK (attr), objfile, cu_header);
        }
      else if (attr->form == DW_FORM_data4 || attr->form == DW_FORM_data8)
        {
          dwarf2_complex_location_expr_complaint ();
          addr = 0;
        }
      else
        {
          dwarf2_invalid_attrib_class_complaint ("DW_AT_frame_base", name);
          addr = 0;
        }
    
      if (isderef)
        dwarf2_unsupported_at_frame_base_complaint (name);
      else if (isreg)
        frame_base_reg = addr;
      else if (offreg)
        {
          frame_base_reg = basereg;
          frame_base_offset = addr;
        }
      else
        dwarf2_unsupported_at_frame_base_complaint (name);
    }

  new = push_context (0, lowpc);
  new->name = new_symbol (die, die->type, objfile, cu_header);

  /* If there was a location expression for DW_AT_frame_base above,
     record it.  We still need to decode it above because not all
     symbols use location expressions exclusively.  */
  if (attr)
    dwarf2_symbol_mark_computed (attr, new->name, cu_header, objfile);

  list_in_scope = &local_symbols;

  if (die->has_children)
    {
      child_die = die->next;
      while (child_die && child_die->tag)
        {
          process_die (child_die, objfile, cu_header);
          child_die = sibling_die (child_die);
        }
    }

  new = pop_context ();
  /* Make a block for the local symbols within.  */
  finish_block (new->name, &local_symbols, new->old_blocks,
                lowpc, highpc, objfile);
  
  /* In C++, we can have functions nested inside functions (e.g., when
     a function declares a class that has methods).  This means that
     when we finish processing a function scope, we may need to go
     back to building a containing block's symbol lists.  */
  local_symbols = new->locals;
  param_symbols = new->params;

  /* If we've finished processing a top-level function, subsequent
     symbols go in the file symbol list.  */
  if (outermost_context_p ())
    list_in_scope = &file_symbols;
}

/* Process all the DIES contained within a lexical block scope.  Start
   a new scope, process the dies, and then close the scope.  */

static void
read_lexical_block_scope (struct die_info *die, struct objfile *objfile,
                          const struct comp_unit_head *cu_header)
{
  register struct context_stack *new;
  CORE_ADDR lowpc, highpc;
  struct die_info *child_die;

  /* Ignore blocks with missing or invalid low and high pc attributes.  */
  /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
     as multiple lexical blocks?  Handling children in a sane way would
     be nasty.  Might be easier to properly extend generic blocks to 
     describe ranges.  */
  if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, objfile, cu_header))
    return;
  lowpc += baseaddr;
  highpc += baseaddr;

  push_context (0, lowpc);
  if (die->has_children)
    {
      child_die = die->next;
      while (child_die && child_die->tag)
        {
          process_die (child_die, objfile, cu_header);
          child_die = sibling_die (child_die);
        }
    }
  new = pop_context ();

  if (local_symbols != NULL)
    {
      finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
                    highpc, objfile);
    }
  local_symbols = new->locals;
}

/* Get low and high pc attributes from a die.  Return 1 if the attributes
   are present and valid, otherwise, return 0.  Return -1 if the range is
   discontinuous, i.e. derived from DW_AT_ranges information.  */
static int
dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
                      CORE_ADDR *highpc, struct objfile *objfile,
                      const struct comp_unit_head *cu_header)
{
  struct attribute *attr;
  bfd *obfd = objfile->obfd;
  CORE_ADDR low = 0;
  CORE_ADDR high = 0;
  int ret = 0;

  attr = dwarf_attr (die, DW_AT_high_pc);
  if (attr)
    {
      high = DW_ADDR (attr);
      attr = dwarf_attr (die, DW_AT_low_pc);
      if (attr)
        low = DW_ADDR (attr);
      else
        /* Found high w/o low attribute.  */
        return 0;

      /* Found consecutive range of addresses.  */
      ret = 1;
    }
  else
    {
      attr = dwarf_attr (die, DW_AT_ranges);
      if (attr != NULL)
        {
          unsigned int addr_size = cu_header->addr_size;
          CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
          /* Value of the DW_AT_ranges attribute is the offset in the
             .debug_renges section.  */
          unsigned int offset = DW_UNSND (attr);
          /* Base address selection entry.  */
          CORE_ADDR base;
          int found_base;
          int dummy;
          unsigned int i;
          char *buffer;
          CORE_ADDR marker;
          int low_set;
 
          found_base = cu_header->base_known;
          base = cu_header->base_address;
          buffer = dwarf_ranges_buffer + offset;

          /* Read in the largest possible address.  */
          marker = read_address (obfd, buffer, cu_header, &dummy);
          if ((marker & mask) == mask)
            {
              /* If we found the largest possible address, then
                 read the base address.  */
              base = read_address (obfd, buffer + addr_size,
                                   cu_header, &dummy);
              buffer += 2 * addr_size;
              offset += 2 * addr_size;
              found_base = 1;
            }

          low_set = 0;

          while (1)
            {
              CORE_ADDR range_beginning, range_end;

              range_beginning = read_address (obfd, buffer,
                                              cu_header, &dummy);
              buffer += addr_size;
              range_end = read_address (obfd, buffer, cu_header, &dummy);
              buffer += addr_size;
              offset += 2 * addr_size;

              /* An end of list marker is a pair of zero addresses.  */
              if (range_beginning == 0 && range_end == 0)
                /* Found the end of list entry.  */
                break;

              /* Each base address selection entry is a pair of 2 values.
                 The first is the largest possible address, the second is
                 the base address.  Check for a base address here.  */
              if ((range_beginning & mask) == mask)
                {
                  /* If we found the largest possible address, then
                     read the base address.  */
                  base = read_address (obfd, buffer + addr_size,
                                       cu_header, &dummy);
                  found_base = 1;
                  continue;
                }

              if (!found_base)
                {
                  /* We have no valid base address for the ranges
                     data.  */
                  complaint (&symfile_complaints,
                             "Invalid .debug_ranges data (no base address)");
                  return 0;
                }

              range_beginning += base;
              range_end += base;

              /* FIXME: This is recording everything as a low-high
                 segment of consecutive addresses.  We should have a
                 data structure for discontiguous block ranges
                 instead.  */
              if (! low_set)
                {
                  low = range_beginning;
                  high = range_end;
                  low_set = 1;
                }
              else
                {
                  if (range_beginning < low)
                    low = range_beginning;
                  if (range_end > high)
                    high = range_end;
                }
            }

          if (! low_set)
            /* If the first entry is an end-of-list marker, the range
               describes an empty scope, i.e. no instructions.  */
            return 0;

          ret = -1;
        }
    }

  if (high < low)
    return 0;

  /* When using the GNU linker, .gnu.linkonce. sections are used to
     eliminate duplicate copies of functions and vtables and such.
     The linker will arbitrarily choose one and discard the others.
     The AT_*_pc values for such functions refer to local labels in
     these sections.  If the section from that file was discarded, the
     labels are not in the output, so the relocs get a value of 0.
     If this is a discarded function, mark the pc bounds as invalid,
     so that GDB will ignore it.  */
  if (low == 0 && (bfd_get_file_flags (obfd) & HAS_RELOC) == 0)
    return 0;

  *lowpc = low;
  *highpc = high;
  return ret;
}

/* Add an aggregate field to the field list.  */

static void
dwarf2_add_field (struct field_info *fip, struct die_info *die,
                  struct objfile *objfile,
                  const struct comp_unit_head *cu_header)
{
  struct nextfield *new_field;
  struct attribute *attr;
  struct field *fp;
  char *fieldname = "";

  /* Allocate a new field list entry and link it in.  */
  new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield));
  make_cleanup (xfree, new_field);
  memset (new_field, 0, sizeof (struct nextfield));
  new_field->next = fip->fields;
  fip->fields = new_field;
  fip->nfields++;

  /* Handle accessibility and virtuality of field.
     The default accessibility for members is public, the default
     accessibility for inheritance is private.  */
  if (die->tag != DW_TAG_inheritance)
    new_field->accessibility = DW_ACCESS_public;
  else
    new_field->accessibility = DW_ACCESS_private;
  new_field->virtuality = DW_VIRTUALITY_none;

  attr = dwarf_attr (die, DW_AT_accessibility);
  if (attr)
    new_field->accessibility = DW_UNSND (attr);
  if (new_field->accessibility != DW_ACCESS_public)
    fip->non_public_fields = 1;
  attr = dwarf_attr (die, DW_AT_virtuality);
  if (attr)
    new_field->virtuality = DW_UNSND (attr);

  fp = &new_field->field;

  if (die->tag == DW_TAG_member && ! die_is_declaration (die))
    {
      /* Data member other than a C++ static data member.  */
      
      /* Get type of field.  */
      fp->type = die_type (die, objfile, cu_header);

      FIELD_STATIC_KIND (*fp) = 0;

      /* Get bit size of field (zero if none).  */
      attr = dwarf_attr (die, DW_AT_bit_size);
      if (attr)
        {
          FIELD_BITSIZE (*fp) = DW_UNSND (attr);
        }
      else
        {
          FIELD_BITSIZE (*fp) = 0;
        }

      /* Get bit offset of field.  */
      attr = dwarf_attr (die, DW_AT_data_member_location);
      if (attr)
        {
          FIELD_BITPOS (*fp) =
            decode_locdesc (DW_BLOCK (attr), objfile, cu_header) * bits_per_byte;
        }
      else
        FIELD_BITPOS (*fp) = 0;
      attr = dwarf_attr (die, DW_AT_bit_offset);
      if (attr)
        {
          if (BITS_BIG_ENDIAN)
            {
              /* For big endian bits, the DW_AT_bit_offset gives the
                 additional bit offset from the MSB of the containing
                 anonymous object to the MSB of the field.  We don't
                 have to do anything special since we don't need to
                 know the size of the anonymous object.  */
              FIELD_BITPOS (*fp) += DW_UNSND (attr);
            }
          else
            {
              /* For little endian bits, compute the bit offset to the
                 MSB of the anonymous object, subtract off the number of
                 bits from the MSB of the field to the MSB of the
                 object, and then subtract off the number of bits of
                 the field itself.  The result is the bit offset of
                 the LSB of the field.  */
              int anonymous_size;
              int bit_offset = DW_UNSND (attr);

              attr = dwarf_attr (die, DW_AT_byte_size);
              if (attr)
                {
                  /* The size of the anonymous object containing
                     the bit field is explicit, so use the
                     indicated size (in bytes).  */
                  anonymous_size = DW_UNSND (attr);
                }
              else
                {
                  /* The size of the anonymous object containing
                     the bit field must be inferred from the type
                     attribute of the data member containing the
                     bit field.  */
                  anonymous_size = TYPE_LENGTH (fp->type);
                }
              FIELD_BITPOS (*fp) += anonymous_size * bits_per_byte
                - bit_offset - FIELD_BITSIZE (*fp);
            }
        }

      /* Get name of field.  */
      attr = dwarf_attr (die, DW_AT_name);
      if (attr && DW_STRING (attr))
        fieldname = DW_STRING (attr);
      fp->name = obsavestring (fieldname, strlen (fieldname),
                               &objfile->type_obstack);

      /* Change accessibility for artificial fields (e.g. virtual table
         pointer or virtual base class pointer) to private.  */
      if (dwarf_attr (die, DW_AT_artificial))
        {
          new_field->accessibility = DW_ACCESS_private;
          fip->non_public_fields = 1;
        }
    }
  else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
    {
      /* C++ static member.  */

      /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
         is a declaration, but all versions of G++ as of this writing
         (so through at least 3.2.1) incorrectly generate
         DW_TAG_variable tags.  */
      
      char *physname;

      /* Get name of field.  */
      attr = dwarf_attr (die, DW_AT_name);
      if (attr && DW_STRING (attr))
        fieldname = DW_STRING (attr);
      else
        return;

      /* Get physical name.  */
      physname = dwarf2_linkage_name (die);

      SET_FIELD_PHYSNAME (*fp, obsavestring (physname, strlen (physname),
                                             &objfile->type_obstack));
      FIELD_TYPE (*fp) = die_type (die, objfile, cu_header);
      FIELD_NAME (*fp) = obsavestring (fieldname, strlen (fieldname),
                                       &objfile->type_obstack);
    }
  else if (die->tag == DW_TAG_inheritance)
    {
      /* C++ base class field.  */
      attr = dwarf_attr (die, DW_AT_data_member_location);
      if (attr)
        FIELD_BITPOS (*fp) = (decode_locdesc (DW_BLOCK (attr), objfile, cu_header)
                              * bits_per_byte);
      FIELD_BITSIZE (*fp) = 0;
      FIELD_STATIC_KIND (*fp) = 0;
      FIELD_TYPE (*fp) = die_type (die, objfile, cu_header);
      FIELD_NAME (*fp) = type_name_no_tag (fp->type);
      fip->nbaseclasses++;
    }
}

/* Create the vector of fields, and attach it to the type.  */

static void
dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
                              struct objfile *objfile)
{
  int nfields = fip->nfields;

  /* Record the field count, allocate space for the array of fields,
     and create blank accessibility bitfields if necessary.  */
  TYPE_NFIELDS (type) = nfields;
  TYPE_FIELDS (type) = (struct field *)
    TYPE_ALLOC (type, sizeof (struct field) * nfields);
  memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);

  if (fip->non_public_fields)
    {
      ALLOCATE_CPLUS_STRUCT_TYPE (type);

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

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

      TYPE_FIELD_IGNORE_BITS (type) =
        (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
      B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
    }

  /* If the type has baseclasses, allocate and clear a bit vector for
     TYPE_FIELD_VIRTUAL_BITS.  */
  if (fip->nbaseclasses)
    {
      int num_bytes = B_BYTES (fip->nbaseclasses);
      char *pointer;

      ALLOCATE_CPLUS_STRUCT_TYPE (type);
      pointer = (char *) TYPE_ALLOC (type, num_bytes);
      TYPE_FIELD_VIRTUAL_BITS (type) = (B_TYPE *) pointer;
      B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
      TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
    }

  /* Copy the saved-up fields into the field vector.  Start from the head
     of the list, adding to the tail of the field array, so that they end
     up in the same order in the array in which they were added to the list.  */
  while (nfields-- > 0)
    {
      TYPE_FIELD (type, nfields) = fip->fields->field;
      switch (fip->fields->accessibility)
        {
        case DW_ACCESS_private:
          SET_TYPE_FIELD_PRIVATE (type, nfields);
          break;

        case DW_ACCESS_protected:
          SET_TYPE_FIELD_PROTECTED (type, nfields);
          break;

        case DW_ACCESS_public:
          break;

        default:
          /* Unknown accessibility.  Complain and treat it as public.  */
          {
            complaint (&symfile_complaints, "unsupported accessibility %d",
                       fip->fields->accessibility);
          }
          break;
        }
      if (nfields < fip->nbaseclasses)
        {
          switch (fip->fields->virtuality)
            {
            case DW_VIRTUALITY_virtual:
            case DW_VIRTUALITY_pure_virtual:
              SET_TYPE_FIELD_VIRTUAL (type, nfields);
              break;
            }
        }
      fip->fields = fip->fields->next;
    }
}

/* Add a member function to the proper fieldlist.  */

static void
dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
                      struct type *type, struct objfile *objfile,
                      const struct comp_unit_head *cu_header)
{
  struct attribute *attr;
  struct fnfieldlist *flp;
  int i;
  struct fn_field *fnp;
  char *fieldname;
  char *physname;
  struct nextfnfield *new_fnfield;

  /* Get name of member function.  */
  attr = dwarf_attr (die, DW_AT_name);
  if (attr && DW_STRING (attr))
    fieldname = DW_STRING (attr);
  else
    return;

  /* Get the mangled name.  */
  physname = dwarf2_linkage_name (die);

  /* Look up member function name in fieldlist.  */
  for (i = 0; i < fip->nfnfields; i++)
    {
      if (STREQ (fip->fnfieldlists[i].name, fieldname))
        break;
    }

  /* Create new list element if necessary.  */
  if (i < fip->nfnfields)
    flp = &fip->fnfieldlists[i];
  else
    {
      if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
        {
          fip->fnfieldlists = (struct fnfieldlist *)
            xrealloc (fip->fnfieldlists,
                      (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
                      * sizeof (struct fnfieldlist));
          if (fip->nfnfields == 0)
            make_cleanup (free_current_contents, &fip->fnfieldlists);
        }
      flp = &fip->fnfieldlists[fip->nfnfields];
      flp->name = fieldname;
      flp->length = 0;
      flp->head = NULL;
      fip->nfnfields++;
    }

  /* Create a new member function field and chain it to the field list
     entry. */
  new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield));
  make_cleanup (xfree, new_fnfield);
  memset (new_fnfield, 0, sizeof (struct nextfnfield));
  new_fnfield->next = flp->head;
  flp->head = new_fnfield;
  flp->length++;

  /* Fill in the member function field info.  */
  fnp = &new_fnfield->fnfield;
  fnp->physname = obsavestring (physname, strlen (physname),
                                &objfile->type_obstack);
  fnp->type = alloc_type (objfile);
  if (die->type && TYPE_CODE (die->type) == TYPE_CODE_FUNC)
    {
      struct type *return_type = TYPE_TARGET_TYPE (die->type);
      int nparams = TYPE_NFIELDS (die->type);

      /* TYPE is the domain of this method, and DIE->TYPE is the type
           of the method itself (TYPE_CODE_METHOD).  */
      smash_to_method_type (fnp->type, type,
                            TYPE_TARGET_TYPE (die->type),
                            TYPE_FIELDS (die->type),
                            TYPE_NFIELDS (die->type),
                            TYPE_VARARGS (die->type));

      /* Handle static member functions.
         Dwarf2 has no clean way to discern C++ static and non-static
         member functions. G++ helps GDB by marking the first
         parameter for non-static member functions (which is the
         this pointer) as artificial. We obtain this information
         from read_subroutine_type via TYPE_FIELD_ARTIFICIAL.  */
      if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (die->type, 0) == 0)
        fnp->voffset = VOFFSET_STATIC;
    }
  else
    complaint (&symfile_complaints, "member function type missing for '%s'",
               physname);

  /* Get fcontext from DW_AT_containing_type if present.  */
  if (dwarf_attr (die, DW_AT_containing_type) != NULL)
    fnp->fcontext = die_containing_type (die, objfile, cu_header);

  /* dwarf2 doesn't have stubbed physical names, so the setting of is_const
     and is_volatile is irrelevant, as it is needed by gdb_mangle_name only.  */

  /* Get accessibility.  */
  attr = dwarf_attr (die, DW_AT_accessibility);
  if (attr)
    {
      switch (DW_UNSND (attr))
        {
        case DW_ACCESS_private:
          fnp->is_private = 1;
          break;
        case DW_ACCESS_protected:
          fnp->is_protected = 1;
          break;
        }
    }

  /* Check for artificial methods.  */
  attr = dwarf_attr (die, DW_AT_artificial);
  if (attr && DW_UNSND (attr) != 0)
    fnp->is_artificial = 1;

  /* Get index in virtual function table if it is a virtual member function.  */
  attr = dwarf_attr (die, DW_AT_vtable_elem_location);
  if (attr)
    {
      /* Support the .debug_loc offsets */
      if (attr_form_is_block (attr))
        {
          fnp->voffset = decode_locdesc (DW_BLOCK (attr), objfile, cu_header) + 2;
        }
      else if (attr->form == DW_FORM_data4 || attr->form == DW_FORM_data8)
        {
          dwarf2_complex_location_expr_complaint ();
        }
      else
        {
          dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
                                                 fieldname);
        }
   }
}

/* Create the vector of member function fields, and attach it to the type.  */

static void
dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
                                 struct objfile *objfile)
{
  struct fnfieldlist *flp;
  int total_length = 0;
  int i;

  ALLOCATE_CPLUS_STRUCT_TYPE (type);
  TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
    TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);

  for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
    {
      struct nextfnfield *nfp = flp->head;
      struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
      int k;

      TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
      TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
      fn_flp->fn_fields = (struct fn_field *)
        TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
      for (k = flp->length; (k--, nfp); nfp = nfp->next)
        fn_flp->fn_fields[k] = nfp->fnfield;

      total_length += flp->length;
    }

  TYPE_NFN_FIELDS (type) = fip->nfnfields;
  TYPE_NFN_FIELDS_TOTAL (type) = total_length;
}

/* Called when we find the DIE that starts a structure or union scope
   (definition) to process all dies that define the members of the
   structure or union.

   NOTE: we need to call struct_type regardless of whether or not the
   DIE has an at_name attribute, since it might be an anonymous
   structure or union.  This gets the type entered into our set of
   user defined types.

   However, if the structure is incomplete (an opaque struct/union)
   then suppress creating a symbol table entry for it since gdb only
   wants to find the one with the complete definition.  Note that if
   it is complete, we just call new_symbol, which does it's own
   checking about whether the struct/union is anonymous or not (and
   suppresses creating a symbol table entry itself).  */

static void
read_structure_scope (struct die_info *die, struct objfile *objfile,
                      const struct comp_unit_head *cu_header)
{
  struct type *type;
  struct attribute *attr;

  type = alloc_type (objfile);

  INIT_CPLUS_SPECIFIC (type);
  attr = dwarf_attr (die, DW_AT_name);
  if (attr && DW_STRING (attr))
    {
      TYPE_TAG_NAME (type) = obsavestring (DW_STRING (attr),
                                           strlen (DW_STRING (attr)),
                                           &objfile->type_obstack);
    }

  if (die->tag == DW_TAG_structure_type)
    {
      TYPE_CODE (type) = TYPE_CODE_STRUCT;
    }
  else if (die->tag == DW_TAG_union_type)
    {
      TYPE_CODE (type) = TYPE_CODE_UNION;
    }
  else
    {
      /* FIXME: TYPE_CODE_CLASS is currently defined to TYPE_CODE_STRUCT
         in gdbtypes.h.  */
      TYPE_CODE (type) = TYPE_CODE_CLASS;
    }

  attr = dwarf_attr (die, DW_AT_byte_size);
  if (attr)
    {
      TYPE_LENGTH (type) = DW_UNSND (attr);
    }
  else
    {
      TYPE_LENGTH (type) = 0;
    }

  /* We need to add the type field to the die immediately so we don't
     infinitely recurse when dealing with pointers to the structure
     type within the structure itself. */
  die->type = type;

  if (die->has_children && ! die_is_declaration (die))
    {
      struct field_info fi;
      struct die_info *child_die;
      struct cleanup *back_to = make_cleanup (null_cleanup, NULL);

      memset (&fi, 0, sizeof (struct field_info));

      child_die = die->next;

      while (child_die && child_die->tag)
        {
          if (child_die->tag == DW_TAG_member
              || child_die->tag == DW_TAG_variable)
            {
              /* NOTE: carlton/2002-11-05: A C++ static data member
                 should be a DW_TAG_member that is a declaration, but
                 all versions of G++ as of this writing (so through at
                 least 3.2.1) incorrectly generate DW_TAG_variable
                 tags for them instead.  */
              dwarf2_add_field (&fi, child_die, objfile, cu_header);
            }
          else if (child_die->tag == DW_TAG_subprogram)
            {
              /* C++ member function. */
              process_die (child_die, objfile, cu_header);
              dwarf2_add_member_fn (&fi, child_die, type, objfile, cu_header);
            }
          else if (child_die->tag == DW_TAG_inheritance)
            {
              /* C++ base class field.  */
              dwarf2_add_field (&fi, child_die, objfile, cu_header);
            }
          else
            {
              process_die (child_die, objfile, cu_header);
            }
          child_die = sibling_die (child_die);
        }

      /* Attach fields and member functions to the type.  */
      if (fi.nfields)
        dwarf2_attach_fields_to_type (&fi, type, objfile);
      if (fi.nfnfields)
        {
          dwarf2_attach_fn_fields_to_type (&fi, type, objfile);

          /* Get the type which refers to the base class (possibly this
             class itself) which contains the vtable pointer for the current
             class from the DW_AT_containing_type attribute.  */

          if (dwarf_attr (die, DW_AT_containing_type) != NULL)
            {
              struct type *t = die_containing_type (die, objfile, cu_header);

              TYPE_VPTR_BASETYPE (type) = t;
              if (type == t)
                {
                  static const char vptr_name[] =
                  {'_', 'v', 'p', 't', 'r', '\0'};
                  int i;

                  /* Our own class provides vtbl ptr.  */
                  for (i = TYPE_NFIELDS (t) - 1;
                       i >= TYPE_N_BASECLASSES (t);
                       --i)
                    {
                      char *fieldname = TYPE_FIELD_NAME (t, i);

                      if (STREQN (fieldname, vptr_name, strlen (vptr_name) - 1)
                          && is_cplus_marker (fieldname[strlen (vptr_name)]))
                        {
                          TYPE_VPTR_FIELDNO (type) = i;
                          break;
                        }
                    }

                  /* Complain if virtual function table field not found.  */
                  if (i < TYPE_N_BASECLASSES (t))
                    complaint (&symfile_complaints,
                               "virtual function table pointer not found when defining class '%s'",
                               TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
                               "");
                }
              else
                {
                  TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t);
                }
            }
        }

      new_symbol (die, type, objfile, cu_header);

      do_cleanups (back_to);
    }
  else
    {
      /* No children, must be stub. */
      TYPE_FLAGS (type) |= TYPE_FLAG_STUB;
    }
}

/* Given a pointer to a die which begins an enumeration, process all
   the dies that define the members of the enumeration.

   This will be much nicer in draft 6 of the DWARF spec when our
   members will be dies instead squished into the DW_AT_element_list
   attribute.

   NOTE: We reverse the order of the element list.  */

static void
read_enumeration (struct die_info *die, struct objfile *objfile,
                  const struct comp_unit_head *cu_header)
{
  struct die_info *child_die;
  struct type *type;
  struct field *fields;
  struct attribute *attr;
  struct symbol *sym;
  int num_fields;
  int unsigned_enum = 1;

  type = alloc_type (objfile);

  TYPE_CODE (type) = TYPE_CODE_ENUM;
  attr = dwarf_attr (die, DW_AT_name);
  if (attr && DW_STRING (attr))
    {
      TYPE_TAG_NAME (type) = obsavestring (DW_STRING (attr),
                                           strlen (DW_STRING (attr)),
                                           &objfile->type_obstack);
    }

  attr = dwarf_attr (die, DW_AT_byte_size);
  if (attr)
    {
      TYPE_LENGTH (type) = DW_UNSND (attr);
    }
  else
    {
      TYPE_LENGTH (type) = 0;
    }

  num_fields = 0;
  fields = NULL;
  if (die->has_children)
    {
      child_die = die->next;
      while (child_die && child_die->tag)
        {
          if (child_die->tag != DW_TAG_enumerator)
            {
              process_die (child_die, objfile, cu_header);
            }
          else
            {
              attr = dwarf_attr (child_die, DW_AT_name);
              if (attr)
                {
                  sym = new_symbol (child_die, type, objfile, cu_header);
                  if (SYMBOL_VALUE (sym) < 0)
                    unsigned_enum = 0;

                  if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
                    {
                      fields = (struct field *)
                        xrealloc (fields,
                                  (num_fields + DW_FIELD_ALLOC_CHUNK)
                                  * sizeof (struct field));
                    }

                  FIELD_NAME (fields[num_fields]) = DEPRECATED_SYMBOL_NAME (sym);
                  FIELD_TYPE (fields[num_fields]) = NULL;
                  FIELD_BITPOS (fields[num_fields]) = SYMBOL_VALUE (sym);
                  FIELD_BITSIZE (fields[num_fields]) = 0;
                  FIELD_STATIC_KIND (fields[num_fields]) = 0;

                  num_fields++;
                }
            }

          child_die = sibling_die (child_die);
        }

      if (num_fields)
        {
          TYPE_NFIELDS (type) = num_fields;
          TYPE_FIELDS (type) = (struct field *)
            TYPE_ALLOC (type, sizeof (struct field) * num_fields);
          memcpy (TYPE_FIELDS (type), fields,
                  sizeof (struct field) * num_fields);
          xfree (fields);
        }
      if (unsigned_enum)
        TYPE_FLAGS (type) |= TYPE_FLAG_UNSIGNED;
    }
  die->type = type;
  new_symbol (die, type, objfile, cu_header);
}

/* Extract all information from a DW_TAG_array_type DIE and put it in
   the DIE's type field.  For now, this only handles one dimensional
   arrays.  */

static void
read_array_type (struct die_info *die, struct objfile *objfile,
                 const struct comp_unit_head *cu_header)
{
  struct die_info *child_die;
  struct type *type = NULL;
  struct type *element_type, *range_type, *index_type;
  struct type **range_types = NULL;
  struct attribute *attr;
  int ndim = 0;
  struct cleanup *back_to;

  /* Return if we've already decoded this type. */
  if (die->type)
    {
      return;
    }

  element_type = die_type (die, objfile, cu_header);

  /* Irix 6.2 native cc creates array types without children for
     arrays with unspecified length.  */
  if (die->has_children == 0)
    {
      index_type = dwarf2_fundamental_type (objfile, FT_INTEGER);
      range_type = create_range_type (NULL, index_type, 0, -1);
      die->type = create_array_type (NULL, element_type, range_type);
      return;
    }

  back_to = make_cleanup (null_cleanup, NULL);
  child_die = die->next;
  while (child_die && child_die->tag)
    {
      if (child_die->tag == DW_TAG_subrange_type)
        {
          unsigned int low, high;

          /* Default bounds to an array with unspecified length.  */
          low = 0;
          high = -1;
          if (cu_language == language_fortran)
            {
              /* FORTRAN implies a lower bound of 1, if not given.  */
              low = 1;
            }

          index_type = die_type (child_die, objfile, cu_header);
          attr = dwarf_attr (child_die, DW_AT_lower_bound);
          if (attr)
            {
              if (attr->form == DW_FORM_sdata)
                {
                  low = DW_SND (attr);
                }
              else if (attr->form == DW_FORM_udata
                       || attr->form == DW_FORM_data1
                       || attr->form == DW_FORM_data2
                       || attr->form == DW_FORM_data4
                       || attr->form == DW_FORM_data8)
                {
                  low = DW_UNSND (attr);
                }
              else
                {
                  dwarf2_non_const_array_bound_ignored_complaint
                    (dwarf_form_name (attr->form));
#ifdef FORTRAN_HACK
                  die->type = lookup_pointer_type (element_type);
                  return;
#else
                  low = 0;
#endif
                }
            }
          attr = dwarf_attr (child_die, DW_AT_upper_bound);
          if (attr)
            {
              if (attr->form == DW_FORM_sdata)
                {
                  high = DW_SND (attr);
                }
              else if (attr->form == DW_FORM_udata
                       || attr->form == DW_FORM_data1
                       || attr->form == DW_FORM_data2
                       || attr->form == DW_FORM_data4
                       || attr->form == DW_FORM_data8)
                {
                  high = DW_UNSND (attr);
                }
              else if (attr->form == DW_FORM_block1)
                {
                  /* GCC encodes arrays with unspecified or dynamic length
                     with a DW_FORM_block1 attribute.
                     FIXME: GDB does not yet know how to handle dynamic
                     arrays properly, treat them as arrays with unspecified
                     length for now.  */
                  high = -1;
                }
              else
                {
                  dwarf2_non_const_array_bound_ignored_complaint
                    (dwarf_form_name (attr->form));
#ifdef FORTRAN_HACK
                  die->type = lookup_pointer_type (element_type);
                  return;
#else
                  high = 1;
#endif
                }
            }

          /* Create a range type and save it for array type creation.  */
          if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
            {
              range_types = (struct type **)
                xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
                          * sizeof (struct type *));
              if (ndim == 0)
                make_cleanup (free_current_contents, &range_types);
            }
          range_types[ndim++] = create_range_type (NULL, index_type, low, high);
        }
      child_die = sibling_die (child_die);
    }

  /* Dwarf2 dimensions are output from left to right, create the
     necessary array types in backwards order.  */
  type = element_type;
  while (ndim-- > 0)
    type = create_array_type (NULL, type, range_types[ndim]);

  /* Understand Dwarf2 support for vector types (like they occur on
     the PowerPC w/ AltiVec).  Gcc just adds another attribute to the
     array type.  This is not part of the Dwarf2/3 standard yet, but a
     custom vendor extension.  The main difference between a regular
     array and the vector variant is that vectors are passed by value
     to functions.  */
  attr = dwarf_attr (die, DW_AT_GNU_vector);
  if (attr)
    TYPE_FLAGS (type) |= TYPE_FLAG_VECTOR;

  do_cleanups (back_to);

  /* Install the type in the die. */
  die->type = type;
}

/* First cut: install each common block member as a global variable.  */

static void
read_common_block (struct die_info *die, struct objfile *objfile,
                   const struct comp_unit_head *cu_header)
{
  struct die_info *child_die;
  struct attribute *attr;
  struct symbol *sym;
  CORE_ADDR base = (CORE_ADDR) 0;

  attr = dwarf_attr (die, DW_AT_location);
  if (attr)
    {
      /* Support the .debug_loc offsets */
      if (attr_form_is_block (attr))
        {
          base = decode_locdesc (DW_BLOCK (attr), objfile, cu_header);
        }
      else if (attr->form == DW_FORM_data4 || attr->form == DW_FORM_data8)
        {
          dwarf2_complex_location_expr_complaint ();
        }
      else
        {
          dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
                                                 "common block member");
        }
    }
  if (die->has_children)
    {
      child_die = die->next;
      while (child_die && child_die->tag)
        {
          sym = new_symbol (child_die, NULL, objfile, cu_header);
          attr = dwarf_attr (child_die, DW_AT_data_member_location);
          if (attr)
            {
              SYMBOL_VALUE_ADDRESS (sym) =
                base + decode_locdesc (DW_BLOCK (attr), objfile, cu_header);
              add_symbol_to_list (sym, &global_symbols);
            }
          child_die = sibling_die (child_die);
        }
    }
}

/* Read a C++ namespace.  */

static void
read_namespace (struct die_info *die, struct objfile *objfile,
                const struct comp_unit_head *cu_header)
{
  const char *previous_namespace = processing_current_namespace;
  const char *name = NULL;
  int is_anonymous;
  struct die_info *current_die;

  /* Loop through the extensions until we find a name.  */

  for (current_die = die;
       current_die != NULL;
       current_die = dwarf2_extension (die))
    {
      name = dwarf2_name (current_die);
      if (name != NULL)
        break;
    }

  /* Is it an anonymous namespace?  */

  is_anonymous = (name == NULL);
  if (is_anonymous)
    name = "(anonymous namespace)";

  /* Now build the name of the current namespace.  */

  if (previous_namespace[0] == '\0')
    {
      processing_current_namespace = name;
    }
  else
    {
      /* We need temp_name around because processing_current_namespace
         is a const char *.  */
      char *temp_name = alloca (strlen (previous_namespace)
                                + 2 + strlen(name) + 1);
      strcpy (temp_name, previous_namespace);
      strcat (temp_name, "::");
      strcat (temp_name, name);

      processing_current_namespace = temp_name;
    }

  /* If it's an anonymous namespace that we're seeing for the first
     time, add a using directive.  */

  if (is_anonymous && dwarf_attr (die, DW_AT_extension) == NULL)
    cp_add_using_directive (processing_current_namespace,
                            strlen (previous_namespace),
                            strlen (processing_current_namespace));

  if (die->has_children)
    {
      struct die_info *child_die = die->next;
      
      while (child_die && child_die->tag)
        {
          process_die (child_die, objfile, cu_header);
          child_die = sibling_die (child_die);
        }
    }

  processing_current_namespace = previous_namespace;
}

/* Extract all information from a DW_TAG_pointer_type DIE and add to
   the user defined type vector.  */

static void
read_tag_pointer_type (struct die_info *die, struct objfile *objfile,
                       const struct comp_unit_head *cu_header)
{
  struct type *type;
  struct attribute *attr_byte_size;
  struct attribute *attr_address_class;
  int byte_size, addr_class;

  if (die->type)
    {
      return;
    }

  type = lookup_pointer_type (die_type (die, objfile, cu_header));

  attr_byte_size = dwarf_attr (die, DW_AT_byte_size);
  if (attr_byte_size)
    byte_size = DW_UNSND (attr_byte_size);
  else
    byte_size = cu_header->addr_size;

  attr_address_class = dwarf_attr (die, DW_AT_address_class);
  if (attr_address_class)
    addr_class = DW_UNSND (attr_address_class);
  else
    addr_class = DW_ADDR_none;

  /* If the pointer size or address class is different than the
     default, create a type variant marked as such and set the
     length accordingly.  */
  if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
    {
      if (ADDRESS_CLASS_TYPE_FLAGS_P ())
        {
          int type_flags;

          type_flags = ADDRESS_CLASS_TYPE_FLAGS (byte_size, addr_class);
          gdb_assert ((type_flags & ~TYPE_FLAG_ADDRESS_CLASS_ALL) == 0);
          type = make_type_with_address_space (type, type_flags);
        }
      else if (TYPE_LENGTH (type) != byte_size)
        {
          complaint (&symfile_complaints, "invalid pointer size %d", byte_size);
        }
      else {
        /* Should we also complain about unhandled address classes?  */
      }
    }

  TYPE_LENGTH (type) = byte_size;
  die->type = type;
}

/* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
   the user defined type vector.  */

static void
read_tag_ptr_to_member_type (struct die_info *die, struct objfile *objfile,
                             const struct comp_unit_head *cu_header)
{
  struct type *type;
  struct type *to_type;
  struct type *domain;

  if (die->type)
    {
      return;
    }

  type = alloc_type (objfile);
  to_type = die_type (die, objfile, cu_header);
  domain = die_containing_type (die, objfile, cu_header);
  smash_to_member_type (type, domain, to_type);

  die->type = type;
}

/* Extract all information from a DW_TAG_reference_type DIE and add to
   the user defined type vector.  */

static void
read_tag_reference_type (struct die_info *die, struct objfile *objfile,
                         const struct comp_unit_head *cu_header)
{
  struct type *type;
  struct attribute *attr;

  if (die->type)
    {
      return;
    }

  type = lookup_reference_type (die_type (die, objfile, cu_header));
  attr = dwarf_attr (die, DW_AT_byte_size);
  if (attr)
    {
      TYPE_LENGTH (type) = DW_UNSND (attr);
    }
  else
    {
      TYPE_LENGTH (type) = cu_header->addr_size;
    }
  die->type = type;
}

static void
read_tag_const_type (struct die_info *die, struct objfile *objfile,
                     const struct comp_unit_head *cu_header)
{
  struct type *base_type;

  if (die->type)
    {
      return;
    }

  base_type = die_type (die, objfile, cu_header);
  die->type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
}

static void
read_tag_volatile_type (struct die_info *die, struct objfile *objfile,
                        const struct comp_unit_head *cu_header)
{
  struct type *base_type;

  if (die->type)
    {
      return;
    }

  base_type = die_type (die, objfile, cu_header);
  die->type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
}

/* Extract all information from a DW_TAG_string_type DIE and add to
   the user defined type vector.  It isn't really a user defined type,
   but it behaves like one, with other DIE's using an AT_user_def_type
   attribute to reference it.  */

static void
read_tag_string_type (struct die_info *die, struct objfile *objfile)
{
  struct type *type, *range_type, *index_type, *char_type;
  struct attribute *attr;
  unsigned int length;

  if (die->type)
    {
      return;
    }

  attr = dwarf_attr (die, DW_AT_string_length);
  if (attr)
    {
      length = DW_UNSND (attr);
    }
  else
    {
      /* check for the DW_AT_byte_size attribute */
      attr = dwarf_attr (die, DW_AT_byte_size);
      if (attr)
        {
          length = DW_UNSND (attr);
        }
      else
        {
          length = 1;
        }
    }
  index_type = dwarf2_fundamental_type (objfile, FT_INTEGER);
  range_type = create_range_type (NULL, index_type, 1, length);
  if (cu_language == language_fortran)
    {
      /* Need to create a unique string type for bounds
         information */
      type = create_string_type (0, range_type);
    }
  else
    {
      char_type = dwarf2_fundamental_type (objfile, FT_CHAR);
      type = create_string_type (char_type, range_type);
    }
  die->type = type;
}

/* Handle DIES due to C code like:

   struct foo
   {
   int (*funcp)(int a, long l);
   int b;
   };

   ('funcp' generates a DW_TAG_subroutine_type DIE)
 */

static void
read_subroutine_type (struct die_info *die, struct objfile *objfile,
                      const struct comp_unit_head *cu_header)
{
  struct type *type;            /* Type that this function returns */
  struct type *ftype;           /* Function that returns above type */
  struct attribute *attr;

  /* Decode the type that this subroutine returns */
  if (die->type)
    {
      return;
    }
  type = die_type (die, objfile, cu_header);
  ftype = lookup_function_type (type);

  /* All functions in C++ have prototypes.  */
  attr = dwarf_attr (die, DW_AT_prototyped);
  if ((attr && (DW_UNSND (attr) != 0))
      || cu_language == language_cplus)
    TYPE_FLAGS (ftype) |= TYPE_FLAG_PROTOTYPED;

  if (die->has_children)
    {
      struct die_info *child_die;
      int nparams = 0;
      int iparams = 0;

      /* Count the number of parameters.
         FIXME: GDB currently ignores vararg functions, but knows about
         vararg member functions.  */
      child_die = die->next;
      while (child_die && child_die->tag)
        {
          if (child_die->tag == DW_TAG_formal_parameter)
            nparams++;
          else if (child_die->tag == DW_TAG_unspecified_parameters)
            TYPE_FLAGS (ftype) |= TYPE_FLAG_VARARGS;
          child_die = sibling_die (child_die);
        }

      /* Allocate storage for parameters and fill them in.  */
      TYPE_NFIELDS (ftype) = nparams;
      TYPE_FIELDS (ftype) = (struct field *)
        TYPE_ALLOC (ftype, nparams * sizeof (struct field));

      child_die = die->next;
      while (child_die && child_die->tag)
        {
          if (child_die->tag == DW_TAG_formal_parameter)
            {
              /* Dwarf2 has no clean way to discern C++ static and non-static
                 member functions. G++ helps GDB by marking the first
                 parameter for non-static member functions (which is the
                 this pointer) as artificial. We pass this information
                 to dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.  */
              attr = dwarf_attr (child_die, DW_AT_artificial);
              if (attr)
                TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
              else
                TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
              TYPE_FIELD_TYPE (ftype, iparams) = die_type (child_die, objfile,
                                                           cu_header);
              iparams++;
            }
          child_die = sibling_die (child_die);
        }
    }

  die->type = ftype;
}

static void
read_typedef (struct die_info *die, struct objfile *objfile,
              const struct comp_unit_head *cu_header)
{
  struct attribute *attr;
  char *name = NULL;

  if (!die->type)
    {
      attr = dwarf_attr (die, DW_AT_name);
      if (attr && DW_STRING (attr))
        {
          name = DW_STRING (attr);
        }
      die->type = init_type (TYPE_CODE_TYPEDEF, 0, TYPE_FLAG_TARGET_STUB, name, objfile);
      TYPE_TARGET_TYPE (die->type) = die_type (die, objfile, cu_header);
    }
}

/* Find a representation of a given base type and install
   it in the TYPE field of the die.  */

static void
read_base_type (struct die_info *die, struct objfile *objfile)
{
  struct type *type;
  struct attribute *attr;
  int encoding = 0, size = 0;

  /* If we've already decoded this die, this is a no-op. */
  if (die->type)
    {
      return;
    }

  attr = dwarf_attr (die, DW_AT_encoding);
  if (attr)
    {
      encoding = DW_UNSND (attr);
    }
  attr = dwarf_attr (die, DW_AT_byte_size);
  if (attr)
    {
      size = DW_UNSND (attr);
    }
  attr = dwarf_attr (die, DW_AT_name);
  if (attr && DW_STRING (attr))
    {
      enum type_code code = TYPE_CODE_INT;
      int type_flags = 0;

      switch (encoding)
        {
        case DW_ATE_address:
          /* Turn DW_ATE_address into a void * pointer.  */
          code = TYPE_CODE_PTR;
          type_flags |= TYPE_FLAG_UNSIGNED;
          break;
        case DW_ATE_boolean:
          code = TYPE_CODE_BOOL;
          type_flags |= TYPE_FLAG_UNSIGNED;
          break;
        case DW_ATE_complex_float:
          code = TYPE_CODE_COMPLEX;
          break;
        case DW_ATE_float:
          code = TYPE_CODE_FLT;
          break;
        case DW_ATE_signed:
        case DW_ATE_signed_char:
          break;
        case DW_ATE_unsigned:
        case DW_ATE_unsigned_char:
          type_flags |= TYPE_FLAG_UNSIGNED;
          break;
        default:
          complaint (&symfile_complaints, "unsupported DW_AT_encoding: '%s'",
                     dwarf_type_encoding_name (encoding));
          break;
        }
      type = init_type (code, size, type_flags, DW_STRING (attr), objfile);
      if (encoding == DW_ATE_address)
        TYPE_TARGET_TYPE (type) = dwarf2_fundamental_type (objfile, FT_VOID);
      else if (encoding == DW_ATE_complex_float)
        {
          if (size == 32)
            TYPE_TARGET_TYPE (type)
              = dwarf2_fundamental_type (objfile, FT_EXT_PREC_FLOAT);
          else if (size == 16)
            TYPE_TARGET_TYPE (type)
              = dwarf2_fundamental_type (objfile, FT_DBL_PREC_FLOAT);
          else if (size == 8)
            TYPE_TARGET_TYPE (type)
              = dwarf2_fundamental_type (objfile, FT_FLOAT);
        }
    }
  else
    {
      type = dwarf_base_type (encoding, size, objfile);
    }
  die->type = type;
}

/* Read a whole compilation unit into a linked list of dies.  */

static struct die_info *
read_comp_unit (char *info_ptr, bfd *abfd,
                const struct comp_unit_head *cu_header)
{
  struct die_info *first_die, *last_die, *die;
  char *cur_ptr;
  int nesting_level;

  /* Reset die reference table; we are
     building new ones now.  */
  dwarf2_empty_hash_tables ();

  cur_ptr = info_ptr;
  nesting_level = 0;
  first_die = last_die = NULL;
  do
    {
      cur_ptr = read_full_die (&die, abfd, cur_ptr, cu_header);
      if (die->has_children)
        {
          nesting_level++;
        }
      if (die->tag == 0)
        {
          nesting_level--;
        }

      die->next = NULL;

      /* Enter die in reference hash table */
      store_in_ref_table (die->offset, die);

      if (!first_die)
        {
          first_die = last_die = die;
        }
      else
        {
          last_die->next = die;
          last_die = die;
        }
    }
  while (nesting_level > 0);
  return first_die;
}

/* Free a linked list of dies.  */

static void
free_die_list (struct die_info *dies)
{
  struct die_info *die, *next;

  die = dies;
  while (die)
    {
      next = die->next;
      xfree (die->attrs);
      xfree (die);
      die = next;
    }
}

static void
do_free_die_list_cleanup (void *dies)
{
  free_die_list (dies);
}

static struct cleanup *
make_cleanup_free_die_list (struct die_info *dies)
{
  return make_cleanup (do_free_die_list_cleanup, dies);
}


/* Read the contents of the section at OFFSET and of size SIZE from the
   object file specified by OBJFILE into the psymbol_obstack and return it.  */

char *
dwarf2_read_section (struct objfile *objfile, file_ptr offset,
                     unsigned int size, asection *sectp)
{
  bfd *abfd = objfile->obfd;
  char *buf, *retbuf;

  if (size == 0)
    return NULL;

  buf = (char *) obstack_alloc (&objfile->psymbol_obstack, size);
  retbuf
    = (char *) symfile_relocate_debug_section (abfd, sectp, (bfd_byte *) buf);
  if (retbuf != NULL)
    return retbuf;

  if ((bfd_seek (abfd, offset, SEEK_SET) != 0) ||
      (bfd_bread (buf, size, abfd) != size))
    {
      buf = NULL;
      error ("Dwarf Error: Can't read DWARF data from '%s'",
             bfd_get_filename (abfd));
    }
  return buf;
}

/* In DWARF version 2, the description of the debugging information is
   stored in a separate .debug_abbrev section.  Before we read any
   dies from a section we read in all abbreviations and install them
   in a hash table.  */

static void
dwarf2_read_abbrevs (bfd *abfd, struct comp_unit_head *cu_header)
{
  char *abbrev_ptr;
  struct abbrev_info *cur_abbrev;
  unsigned int abbrev_number, bytes_read, abbrev_name;
  unsigned int abbrev_form, hash_number;

  /* Initialize dwarf2 abbrevs */
  memset (cu_header->dwarf2_abbrevs, 0,
          ABBREV_HASH_SIZE*sizeof (struct abbrev_info *));

  abbrev_ptr = dwarf_abbrev_buffer + cu_header->abbrev_offset;
  abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
  abbrev_ptr += bytes_read;

  /* loop until we reach an abbrev number of 0 */
  while (abbrev_number)
    {
      cur_abbrev = dwarf_alloc_abbrev ();

      /* read in abbrev header */
      cur_abbrev->number = abbrev_number;
      cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
      abbrev_ptr += bytes_read;
      cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
      abbrev_ptr += 1;

      /* now read in declarations */
      abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
      abbrev_ptr += bytes_read;
      abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
      abbrev_ptr += bytes_read;
      while (abbrev_name)
        {
          if ((cur_abbrev->num_attrs % ATTR_ALLOC_CHUNK) == 0)
            {
              cur_abbrev->attrs = (struct attr_abbrev *)
                xrealloc (cur_abbrev->attrs,
                          (cur_abbrev->num_attrs + ATTR_ALLOC_CHUNK)
                          * sizeof (struct attr_abbrev));
            }
          cur_abbrev->attrs[cur_abbrev->num_attrs].name = abbrev_name;
          cur_abbrev->attrs[cur_abbrev->num_attrs++].form = abbrev_form;
          abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
          abbrev_ptr += bytes_read;
          abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
          abbrev_ptr += bytes_read;
        }

      hash_number = abbrev_number % ABBREV_HASH_SIZE;
      cur_abbrev->next = cu_header->dwarf2_abbrevs[hash_number];
      cu_header->dwarf2_abbrevs[hash_number] = cur_abbrev;

      /* Get next abbreviation.
         Under Irix6 the abbreviations for a compilation unit are not
         always properly terminated with an abbrev number of 0.
         Exit loop if we encounter an abbreviation which we have
         already read (which means we are about to read the abbreviations
         for the next compile unit) or if the end of the abbreviation
         table is reached.  */
      if ((unsigned int) (abbrev_ptr - dwarf_abbrev_buffer)
          >= dwarf_abbrev_size)
        break;
      abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
      abbrev_ptr += bytes_read;
      if (dwarf2_lookup_abbrev (abbrev_number, cu_header) != NULL)
        break;
    }
}

/* Empty the abbrev table for a new compilation unit.  */

/* ARGSUSED */
static void
dwarf2_empty_abbrev_table (void *ptr_to_abbrevs_table)
{
  int i;
  struct abbrev_info *abbrev, *next;
  struct abbrev_info **abbrevs;

  abbrevs = (struct abbrev_info **)ptr_to_abbrevs_table;

  for (i = 0; i < ABBREV_HASH_SIZE; ++i)
    {
      next = NULL;
      abbrev = abbrevs[i];
      while (abbrev)
        {
          next = abbrev->next;
          xfree (abbrev->attrs);
          xfree (abbrev);
          abbrev = next;
        }
      abbrevs[i] = NULL;
    }
}

/* Lookup an abbrev_info structure in the abbrev hash table.  */

static struct abbrev_info *
dwarf2_lookup_abbrev (unsigned int number, const struct comp_unit_head *cu_header)
{
  unsigned int hash_number;
  struct abbrev_info *abbrev;

  hash_number = number % ABBREV_HASH_SIZE;
  abbrev = cu_header->dwarf2_abbrevs[hash_number];

  while (abbrev)
    {
      if (abbrev->number == number)
        return abbrev;
      else
        abbrev = abbrev->next;
    }
  return NULL;
}

/* Read a minimal amount of information into the minimal die structure.  */

static char *
read_partial_die (struct partial_die_info *part_die, bfd *abfd,
                  char *info_ptr, const struct comp_unit_head *cu_header)
{
  unsigned int abbrev_number, bytes_read, i;
  struct abbrev_info *abbrev;
  struct attribute attr;
  struct attribute spec_attr;
  int found_spec_attr = 0;
  int has_low_pc_attr = 0;
  int has_high_pc_attr = 0;

  *part_die = zeroed_partial_die;
  abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
  info_ptr += bytes_read;
  if (!abbrev_number)
    return info_ptr;

  abbrev = dwarf2_lookup_abbrev (abbrev_number, cu_header);
  if (!abbrev)
    {
      error ("Dwarf Error: Could not find abbrev number %d [in module %s]", abbrev_number,
                      bfd_get_filename (abfd));
    }
  part_die->offset = info_ptr - dwarf_info_buffer;
  part_die->tag = abbrev->tag;
  part_die->has_children = abbrev->has_children;
  part_die->abbrev = abbrev_number;

  for (i = 0; i < abbrev->num_attrs; ++i)
    {
      info_ptr = read_attribute (&attr, &abbrev->attrs[i], abfd,
                                 info_ptr, cu_header);

      /* Store the data if it is of an attribute we want to keep in a
         partial symbol table.  */
      switch (attr.name)
        {
        case DW_AT_name:

          /* Prefer DW_AT_MIPS_linkage_name over DW_AT_name.  */
          if (part_die->name == NULL)
            part_die->name = DW_STRING (&attr);
          break;
        case DW_AT_MIPS_linkage_name:
          part_die->name = DW_STRING (&attr);
          break;
        case DW_AT_low_pc:
          has_low_pc_attr = 1;
          part_die->lowpc = DW_ADDR (&attr);
          break;
        case DW_AT_high_pc:
          has_high_pc_attr = 1;
          part_die->highpc = DW_ADDR (&attr);
          break;
        case DW_AT_location:
          /* Support the .debug_loc offsets */
          if (attr_form_is_block (&attr))
            {
               part_die->locdesc = DW_BLOCK (&attr);
            }
          else if (attr.form == DW_FORM_data4 || attr.form == DW_FORM_data8)
            {
              dwarf2_complex_location_expr_complaint ();
            }
          else
            {
              dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
                                                     "partial symbol information");
            }
          break;
        case DW_AT_language:
          part_die->language = DW_UNSND (&attr);
          break;
        case DW_AT_external:
          part_die->is_external = DW_UNSND (&attr);
          break;
        case DW_AT_declaration:
          part_die->is_declaration = DW_UNSND (&attr);
          break;
        case DW_AT_type:
          part_die->has_type = 1;
          break;
        case DW_AT_abstract_origin:
        case DW_AT_specification:
          found_spec_attr = 1;
          spec_attr = attr;
          break;
        case DW_AT_sibling:
          /* Ignore absolute siblings, they might point outside of
             the current compile unit.  */
          if (attr.form == DW_FORM_ref_addr)
            complaint (&symfile_complaints, "ignoring absolute DW_AT_sibling");
          else
            part_die->sibling =
              dwarf_info_buffer + dwarf2_get_ref_die_offset (&attr);
          break;
        default:
          break;
        }
    }

  /* If we found a reference attribute and the die has no name, try
     to find a name in the referred to die.  */

  if (found_spec_attr && part_die->name == NULL)
    {
      struct partial_die_info spec_die;
      char *spec_ptr;
      int dummy;

      spec_ptr = dwarf_info_buffer + dwarf2_get_ref_die_offset (&spec_attr);
      read_partial_die (&spec_die, abfd, spec_ptr, cu_header);
      if (spec_die.name)
        {
          part_die->name = spec_die.name;

          /* Copy DW_AT_external attribute if it is set.  */
          if (spec_die.is_external)
            part_die->is_external = spec_die.is_external;
        }
    }

  /* When using the GNU linker, .gnu.linkonce. sections are used to
     eliminate duplicate copies of functions and vtables and such.
     The linker will arbitrarily choose one and discard the others.
     The AT_*_pc values for such functions refer to local labels in
     these sections.  If the section from that file was discarded, the
     labels are not in the output, so the relocs get a value of 0.
     If this is a discarded function, mark the pc bounds as invalid,
     so that GDB will ignore it.  */
  if (has_low_pc_attr && has_high_pc_attr
      && part_die->lowpc < part_die->highpc
      && (part_die->lowpc != 0
          || (bfd_get_file_flags (abfd) & HAS_RELOC)))
    part_die->has_pc_info = 1;
  return info_ptr;
}

/* Read the die from the .debug_info section buffer.  And set diep to
   point to a newly allocated die with its information.  */

static char *
read_full_die (struct die_info **diep, bfd *abfd, char *info_ptr,
               const struct comp_unit_head *cu_header)
{
  unsigned int abbrev_number, bytes_read, i, offset;
  struct abbrev_info *abbrev;
  struct die_info *die;

  offset = info_ptr - dwarf_info_buffer;
  abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
  info_ptr += bytes_read;
  if (!abbrev_number)
    {
      die = dwarf_alloc_die ();
      die->tag = 0;
      die->abbrev = abbrev_number;
      die->type = NULL;
      *diep = die;
      return info_ptr;
    }

  abbrev = dwarf2_lookup_abbrev (abbrev_number, cu_header);
  if (!abbrev)
    {
      error ("Dwarf Error: could not find abbrev number %d [in module %s]", abbrev_number, 
                      bfd_get_filename (abfd));
    }
  die = dwarf_alloc_die ();
  die->offset = offset;
  die->tag = abbrev->tag;
  die->has_children = abbrev->has_children;
  die->abbrev = abbrev_number;
  die->type = NULL;

  die->num_attrs = abbrev->num_attrs;
  die->attrs = (struct attribute *)
    xmalloc (die->num_attrs * sizeof (struct attribute));

  for (i = 0; i < abbrev->num_attrs; ++i)
    {
      info_ptr = read_attribute (&die->attrs[i], &abbrev->attrs[i],
                                 abfd, info_ptr, cu_header);
    }

  *diep = die;
  return info_ptr;
}

/* Read an attribute value described by an attribute form.  */

static char *
read_attribute_value (struct attribute *attr, unsigned form,
                bfd *abfd, char *info_ptr,
                const struct comp_unit_head *cu_header)
{
  unsigned int bytes_read;
  struct dwarf_block *blk;

  attr->form = form;
  switch (form)
    {
    case DW_FORM_addr:
    case DW_FORM_ref_addr:
      DW_ADDR (attr) = read_address (abfd, info_ptr, cu_header, &bytes_read);
      info_ptr += bytes_read;
      break;
    case DW_FORM_block2:
      blk = dwarf_alloc_block ();
      blk->size = read_2_bytes (abfd, info_ptr);
      info_ptr += 2;
      blk->data = read_n_bytes (abfd, info_ptr, blk->size);
      info_ptr += blk->size;
      DW_BLOCK (attr) = blk;
      break;
    case DW_FORM_block4:
      blk = dwarf_alloc_block ();
      blk->size = read_4_bytes (abfd, info_ptr);
      info_ptr += 4;
      blk->data = read_n_bytes (abfd, info_ptr, blk->size);
      info_ptr += blk->size;
      DW_BLOCK (attr) = blk;
      break;
    case DW_FORM_data2:
      DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
      info_ptr += 2;
      break;
    case DW_FORM_data4:
      DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
      info_ptr += 4;
      break;
    case DW_FORM_data8:
      DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
      info_ptr += 8;
      break;
    case DW_FORM_string:
      DW_STRING (attr) = read_string (abfd, info_ptr, &bytes_read);
      info_ptr += bytes_read;
      break;
    case DW_FORM_strp:
      DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
                                               &bytes_read);
      info_ptr += bytes_read;
      break;
    case DW_FORM_block:
      blk = dwarf_alloc_block ();
      blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
      info_ptr += bytes_read;
      blk->data = read_n_bytes (abfd, info_ptr, blk->size);
      info_ptr += blk->size;
      DW_BLOCK (attr) = blk;
      break;
    case DW_FORM_block1:
      blk = dwarf_alloc_block ();
      blk->size = read_1_byte (abfd, info_ptr);
      info_ptr += 1;
      blk->data = read_n_bytes (abfd, info_ptr, blk->size);
      info_ptr += blk->size;
      DW_BLOCK (attr) = blk;
      break;
    case DW_FORM_data1:
      DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
      info_ptr += 1;
      break;
    case DW_FORM_flag:
      DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
      info_ptr += 1;
      break;
    case DW_FORM_sdata:
      DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
      info_ptr += bytes_read;
      break;
    case DW_FORM_udata:
      DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
      info_ptr += bytes_read;
      break;
    case DW_FORM_ref1:
      DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
      info_ptr += 1;
      break;
    case DW_FORM_ref2:
      DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
      info_ptr += 2;
      break;
    case DW_FORM_ref4:
      DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
      info_ptr += 4;
      break;
    case DW_FORM_ref8:
      DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
      info_ptr += 8;
      break;
    case DW_FORM_ref_udata:
      DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
      info_ptr += bytes_read;
      break;
    case DW_FORM_indirect:
      form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
      info_ptr += bytes_read;
      info_ptr = read_attribute_value (attr, form, abfd, info_ptr, cu_header);
      break;
    default:
      error ("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]",
             dwarf_form_name (form),
             bfd_get_filename (abfd));
    }
  return info_ptr;
}

/* Read an attribute described by an abbreviated attribute.  */

static char *
read_attribute (struct attribute *attr, struct attr_abbrev *abbrev,
                bfd *abfd, char *info_ptr,
                const struct comp_unit_head *cu_header)
{
  attr->name = abbrev->name;
  return read_attribute_value (attr, abbrev->form, abfd, info_ptr, cu_header);
}

/* read dwarf information from a buffer */

static unsigned int
read_1_byte (bfd *abfd, char *buf)
{
  return bfd_get_8 (abfd, (bfd_byte *) buf);
}

static int
read_1_signed_byte (bfd *abfd, char *buf)
{
  return bfd_get_signed_8 (abfd, (bfd_byte *) buf);
}

static unsigned int
read_2_bytes (bfd *abfd, char *buf)
{
  return bfd_get_16 (abfd, (bfd_byte *) buf);
}

static int
read_2_signed_bytes (bfd *abfd, char *buf)
{
  return bfd_get_signed_16 (abfd, (bfd_byte *) buf);
}

static unsigned int
read_4_bytes (bfd *abfd, char *buf)
{
  return bfd_get_32 (abfd, (bfd_byte *) buf);
}

static int
read_4_signed_bytes (bfd *abfd, char *buf)
{
  return bfd_get_signed_32 (abfd, (bfd_byte *) buf);
}

static unsigned long
read_8_bytes (bfd *abfd, char *buf)
{
  return bfd_get_64 (abfd, (bfd_byte *) buf);
}

static CORE_ADDR
read_address (bfd *abfd, char *buf, const struct comp_unit_head *cu_header,
              int *bytes_read)
{
  CORE_ADDR retval = 0;

  if (cu_header->signed_addr_p)
    {
      switch (cu_header->addr_size)
        {
        case 2:
          retval = bfd_get_signed_16 (abfd, (bfd_byte *) buf);
          break;
        case 4:
          retval = bfd_get_signed_32 (abfd, (bfd_byte *) buf);
          break;
        case 8:
          retval = bfd_get_signed_64 (abfd, (bfd_byte *) buf);
          break;
        default:
          internal_error (__FILE__, __LINE__,
                          "read_address: bad switch, signed [in module %s]",
                          bfd_get_filename (abfd));
        }
    }
  else
    {
      switch (cu_header->addr_size)
        {
        case 2:
          retval = bfd_get_16 (abfd, (bfd_byte *) buf);
          break;
        case 4:
          retval = bfd_get_32 (abfd, (bfd_byte *) buf);
          break;
        case 8:
          retval = bfd_get_64 (abfd, (bfd_byte *) buf);
          break;
        default:
          internal_error (__FILE__, __LINE__,
                          "read_address: bad switch, unsigned [in module %s]",
                          bfd_get_filename (abfd));
        }
    }

  *bytes_read = cu_header->addr_size;
  return retval;
}

/* Read the initial length from a section.  The (draft) DWARF 3
   specification allows the initial length to take up either 4 bytes
   or 12 bytes.  If the first 4 bytes are 0xffffffff, then the next 8
   bytes describe the length and all offsets will be 8 bytes in length
   instead of 4.

   An older, non-standard 64-bit format is also handled by this
   function.  The older format in question stores the initial length
   as an 8-byte quantity without an escape value.  Lengths greater
   than 2^32 aren't very common which means that the initial 4 bytes
   is almost always zero.  Since a length value of zero doesn't make
   sense for the 32-bit format, this initial zero can be considered to
   be an escape value which indicates the presence of the older 64-bit
   format.  As written, the code can't detect (old format) lengths
   greater than 4GB.  If it becomes necessary to handle lengths somewhat
   larger than 4GB, we could allow other small values (such as the
   non-sensical values of 1, 2, and 3) to also be used as escape values
   indicating the presence of the old format.

   The value returned via bytes_read should be used to increment
   the relevant pointer after calling read_initial_length().
   
   As a side effect, this function sets the fields initial_length_size
   and offset_size in cu_header to the values appropriate for the
   length field.  (The format of the initial length field determines
   the width of file offsets to be fetched later with fetch_offset().)
   
   [ Note:  read_initial_length() and read_offset() are based on the
     document entitled "DWARF Debugging Information Format", revision
     3, draft 8, dated November 19, 2001.  This document was obtained
     from:

        http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
     
     This document is only a draft and is subject to change.  (So beware.)

     Details regarding the older, non-standard 64-bit format were
     determined empirically by examining 64-bit ELF files produced
     by the SGI toolchain on an IRIX 6.5 machine.

     - Kevin, July 16, 2002
   ] */

static LONGEST
read_initial_length (bfd *abfd, char *buf, struct comp_unit_head *cu_header,
                     int *bytes_read)
{
  LONGEST retval = 0;

  retval = bfd_get_32 (abfd, (bfd_byte *) buf);

  if (retval == 0xffffffff)
    {
      retval = bfd_get_64 (abfd, (bfd_byte *) buf + 4);
      *bytes_read = 12;
      if (cu_header != NULL)
        {
          cu_header->initial_length_size = 12;
          cu_header->offset_size = 8;
        }
    }
  else if (retval == 0)
    {
      /* Handle (non-standard) 64-bit DWARF2 formats such as that used
         by IRIX.  */
      retval = bfd_get_64 (abfd, (bfd_byte *) buf);
      *bytes_read = 8;
      if (cu_header != NULL)
        {
          cu_header->initial_length_size = 8;
          cu_header->offset_size = 8;
        }
    }
  else
    {
      *bytes_read = 4;
      if (cu_header != NULL)
        {
          cu_header->initial_length_size = 4;
          cu_header->offset_size = 4;
        }
    }

 return retval;
}

/* Read an offset from the data stream.  The size of the offset is
   given by cu_header->offset_size. */

static LONGEST
read_offset (bfd *abfd, char *buf, const struct comp_unit_head *cu_header,
             int *bytes_read)
{
  LONGEST retval = 0;

  switch (cu_header->offset_size)
    {
    case 4:
      retval = bfd_get_32 (abfd, (bfd_byte *) buf);
      *bytes_read = 4;
      break;
    case 8:
      retval = bfd_get_64 (abfd, (bfd_byte *) buf);
      *bytes_read = 8;
      break;
    default:
      internal_error (__FILE__, __LINE__,
                      "read_offset: bad switch [in module %s]",
                      bfd_get_filename (abfd));
    }

 return retval;
}

static char *
read_n_bytes (bfd *abfd, char *buf, unsigned int size)
{
  /* If the size of a host char is 8 bits, we can return a pointer
     to the buffer, otherwise we have to copy the data to a buffer
     allocated on the temporary obstack.  */
  gdb_assert (HOST_CHAR_BIT == 8);
  return buf;
}

static char *
read_string (bfd *abfd, char *buf, unsigned int *bytes_read_ptr)
{
  /* If the size of a host char is 8 bits, we can return a pointer
     to the string, otherwise we have to copy the string to a buffer
     allocated on the temporary obstack.  */
  gdb_assert (HOST_CHAR_BIT == 8);
  if (*buf == '\0')
    {
      *bytes_read_ptr = 1;
      return NULL;
    }
  *bytes_read_ptr = strlen (buf) + 1;
  return buf;
}

static char *
read_indirect_string (bfd *abfd, char *buf,
                      const struct comp_unit_head *cu_header,
                      unsigned int *bytes_read_ptr)
{
  LONGEST str_offset = read_offset (abfd, buf, cu_header,
                                    (int *) bytes_read_ptr);

  if (dwarf_str_buffer == NULL)
    {
      error ("DW_FORM_strp used without .debug_str section [in module %s]",
                      bfd_get_filename (abfd));
      return NULL;
    }
  if (str_offset >= dwarf_str_size)
    {
      error ("DW_FORM_strp pointing outside of .debug_str section [in module %s]",
                      bfd_get_filename (abfd));
      return NULL;
    }
  gdb_assert (HOST_CHAR_BIT == 8);
  if (dwarf_str_buffer[str_offset] == '\0')
    return NULL;
  return dwarf_str_buffer + str_offset;
}

static unsigned long
read_unsigned_leb128 (bfd *abfd, char *buf, unsigned int *bytes_read_ptr)
{
  unsigned long result;
  unsigned int num_read;
  int i, shift;
  unsigned char byte;

  result = 0;
  shift = 0;
  num_read = 0;
  i = 0;
  while (1)
    {
      byte = bfd_get_8 (abfd, (bfd_byte *) buf);
      buf++;
      num_read++;
      result |= ((unsigned long)(byte & 127) << shift);
      if ((byte & 128) == 0)
        {
          break;
        }
      shift += 7;
    }
  *bytes_read_ptr = num_read;
  return result;
}

static long
read_signed_leb128 (bfd *abfd, char *buf, unsigned int *bytes_read_ptr)
{
  long result;
  int i, shift, size, num_read;
  unsigned char byte;

  result = 0;
  shift = 0;
  size = 32;
  num_read = 0;
  i = 0;
  while (1)
    {
      byte = bfd_get_8 (abfd, (bfd_byte *) buf);
      buf++;
      num_read++;
      result |= ((long)(byte & 127) << shift);
      shift += 7;
      if ((byte & 128) == 0)
        {
          break;
        }
    }
  if ((shift < size) && (byte & 0x40))
    {
      result |= -(1 << shift);
    }
  *bytes_read_ptr = num_read;
  return result;
}

static void
set_cu_language (unsigned int lang)
{
  switch (lang)
    {
    case DW_LANG_C89:
    case DW_LANG_C:
      cu_language = language_c;
      break;
    case DW_LANG_C_plus_plus:
      cu_language = language_cplus;
      break;
    case DW_LANG_Fortran77:
    case DW_LANG_Fortran90:
    case DW_LANG_Fortran95:
      cu_language = language_fortran;
      break;
    case DW_LANG_Mips_Assembler:
      cu_language = language_asm;
      break;
    case DW_LANG_Java:
      cu_language = language_java;
      break;
    case DW_LANG_Ada83:
    case DW_LANG_Ada95:
    case DW_LANG_Cobol74:
    case DW_LANG_Cobol85:
    case DW_LANG_Pascal83:
    case DW_LANG_Modula2:
    default:
      cu_language = language_minimal;
      break;
    }
  cu_language_defn = language_def (cu_language);
}

/* Return the named attribute or NULL if not there.  */

static struct attribute *
dwarf_attr (struct die_info *die, unsigned int name)
{
  unsigned int i;
  struct attribute *spec = NULL;

  for (i = 0; i < die->num_attrs; ++i)
    {
      if (die->attrs[i].name == name)
        {
          return &die->attrs[i];
        }
      if (die->attrs[i].name == DW_AT_specification
          || die->attrs[i].name == DW_AT_abstract_origin)
        spec = &die->attrs[i];
    }
  if (spec)
    {
      struct die_info *ref_die =
      follow_die_ref (dwarf2_get_ref_die_offset (spec));

      if (ref_die)
        return dwarf_attr (ref_die, name);
    }

  return NULL;
}

static int
die_is_declaration (struct die_info *die)
{
  return (dwarf_attr (die, DW_AT_declaration)
          && ! dwarf_attr (die, DW_AT_specification));
}


/* Free the line_header structure *LH, and any arrays and strings it
   refers to.  */
static void
free_line_header (struct line_header *lh)
{
  if (lh->standard_opcode_lengths)
    xfree (lh->standard_opcode_lengths);

  /* Remember that all the lh->file_names[i].name pointers are
     pointers into debug_line_buffer, and don't need to be freed.  */
  if (lh->file_names)
    xfree (lh->file_names);

  /* Similarly for the include directory names.  */
  if (lh->include_dirs)
    xfree (lh->include_dirs);

  xfree (lh);
}


/* Add an entry to LH's include directory table.  */
static void
add_include_dir (struct line_header *lh, char *include_dir)
{
  /* Grow the array if necessary.  */
  if (lh->include_dirs_size == 0)
    {
      lh->include_dirs_size = 1; /* for testing */
      lh->include_dirs = xmalloc (lh->include_dirs_size
                                  * sizeof (*lh->include_dirs));
    }
  else if (lh->num_include_dirs >= lh->include_dirs_size)
    {
      lh->include_dirs_size *= 2;
      lh->include_dirs = xrealloc (lh->include_dirs,
                                   (lh->include_dirs_size
                                    * sizeof (*lh->include_dirs)));
    }

  lh->include_dirs[lh->num_include_dirs++] = include_dir;
}
 

/* Add an entry to LH's file name table.  */
static void
add_file_name (struct line_header *lh,
               char *name,
               unsigned int dir_index,
               unsigned int mod_time,
               unsigned int length)
{
  struct file_entry *fe;

  /* Grow the array if necessary.  */
  if (lh->file_names_size == 0)
    {
      lh->file_names_size = 1; /* for testing */
      lh->file_names = xmalloc (lh->file_names_size
                                * sizeof (*lh->file_names));
    }
  else if (lh->num_file_names >= lh->file_names_size)
    {
      lh->file_names_size *= 2;
      lh->file_names = xrealloc (lh->file_names,
                                 (lh->file_names_size
                                  * sizeof (*lh->file_names)));
    }

  fe = &lh->file_names[lh->num_file_names++];
  fe->name = name;
  fe->dir_index = dir_index;
  fe->mod_time = mod_time;
  fe->length = length;
}
 

/* Read the statement program header starting at OFFSET in
   dwarf_line_buffer, according to the endianness of ABFD.  Return a
   pointer to a struct line_header, allocated using xmalloc.

   NOTE: the strings in the include directory and file name tables of
   the returned object point into debug_line_buffer, and must not be
   freed.  */
static struct line_header *
dwarf_decode_line_header (unsigned int offset, bfd *abfd,
                          const struct comp_unit_head *cu_header)
{
  struct cleanup *back_to;
  struct line_header *lh;
  char *line_ptr;
  int bytes_read;
  int i;
  char *cur_dir, *cur_file;

  if (dwarf_line_buffer == NULL)
    {
      complaint (&symfile_complaints, "missing .debug_line section");
      return 0;
    }

  /* Make sure that at least there's room for the total_length field.  That
     could be 12 bytes long, but we're just going to fudge that.  */
  if (offset + 4 >= dwarf_line_size)
    {
      dwarf2_statement_list_fits_in_line_number_section_complaint ();
      return 0;
    }

  lh = xmalloc (sizeof (*lh));
  memset (lh, 0, sizeof (*lh));
  back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
                          (void *) lh);

  line_ptr = dwarf_line_buffer + offset;

  /* read in the header */
  lh->total_length = read_initial_length (abfd, line_ptr, NULL, &bytes_read);
  line_ptr += bytes_read;
  if (line_ptr + lh->total_length > dwarf_line_buffer + dwarf_line_size)
    {
      dwarf2_statement_list_fits_in_line_number_section_complaint ();
      return 0;
    }
  lh->statement_program_end = line_ptr + lh->total_length;
  lh->version = read_2_bytes (abfd, line_ptr);
  line_ptr += 2;
  lh->header_length = read_offset (abfd, line_ptr, cu_header, &bytes_read);
  line_ptr += bytes_read;
  lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
  line_ptr += 1;
  lh->default_is_stmt = read_1_byte (abfd, line_ptr);
  line_ptr += 1;
  lh->line_base = read_1_signed_byte (abfd, line_ptr);
  line_ptr += 1;
  lh->line_range = read_1_byte (abfd, line_ptr);
  line_ptr += 1;
  lh->opcode_base = read_1_byte (abfd, line_ptr);
  line_ptr += 1;
  lh->standard_opcode_lengths
    = (unsigned char *) xmalloc (lh->opcode_base * sizeof (unsigned char));

  lh->standard_opcode_lengths[0] = 1;  /* This should never be used anyway.  */
  for (i = 1; i < lh->opcode_base; ++i)
    {
      lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
      line_ptr += 1;
    }

  /* Read directory table  */
  while ((cur_dir = read_string (abfd, line_ptr, &bytes_read)) != NULL)
    {
      line_ptr += bytes_read;
      add_include_dir (lh, cur_dir);
    }
  line_ptr += bytes_read;

  /* Read file name table */
  while ((cur_file = read_string (abfd, line_ptr, &bytes_read)) != NULL)
    {
      unsigned int dir_index, mod_time, length;

      line_ptr += bytes_read;
      dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
      line_ptr += bytes_read;
      mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
      line_ptr += bytes_read;
      length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
      line_ptr += bytes_read;

      add_file_name (lh, cur_file, dir_index, mod_time, length);
    }
  line_ptr += bytes_read;
  lh->statement_program_start = line_ptr; 

  if (line_ptr > dwarf_line_buffer + dwarf_line_size)
    complaint (&symfile_complaints,
               "line number info header doesn't fit in `.debug_line' section");

  discard_cleanups (back_to);
  return lh;
}

/* This function exists to work around a bug in certain compilers
   (particularly GCC 2.95), in which the first line number marker of a
   function does not show up until after the prologue, right before
   the second line number marker.  This function shifts ADDRESS down
   to the beginning of the function if necessary, and is called on
   addresses passed to record_line.  */

static CORE_ADDR
check_cu_functions (CORE_ADDR address)
{
  struct function_range *fn;

  /* Find the function_range containing address.  */
  if (!cu_first_fn)
    return address;

  if (!cu_cached_fn)
    cu_cached_fn = cu_first_fn;

  fn = cu_cached_fn;
  while (fn)
    if (fn->lowpc <= address && fn->highpc > address)
      goto found;
    else
      fn = fn->next;

  fn = cu_first_fn;
  while (fn && fn != cu_cached_fn)
    if (fn->lowpc <= address && fn->highpc > address)
      goto found;
    else
      fn = fn->next;

  return address;

 found:
  if (fn->seen_line)
    return address;
  if (address != fn->lowpc)
    complaint (&symfile_complaints,
               "misplaced first line number at 0x%lx for '%s'",
               (unsigned long) address, fn->name);
  fn->seen_line = 1;
  return fn->lowpc;
}

/* Decode the line number information for the compilation unit whose
   line number info is at OFFSET in the .debug_line section.
   The compilation directory of the file is passed in COMP_DIR.  */

static void
dwarf_decode_lines (struct line_header *lh, char *comp_dir, bfd *abfd,
                    const struct comp_unit_head *cu_header)
{
  char *line_ptr;
  char *line_end;
  unsigned int i, bytes_read;
  char *cur_dir;
  unsigned char op_code, extended_op, adj_opcode;

  line_ptr = lh->statement_program_start;
  line_end = lh->statement_program_end;

  /* Read the statement sequences until there's nothing left.  */
  while (line_ptr < line_end)
    {
      /* state machine registers  */
      CORE_ADDR address = 0;
      unsigned int file = 1;
      unsigned int line = 1;
      unsigned int column = 0;
      int is_stmt = lh->default_is_stmt;
      int basic_block = 0;
      int end_sequence = 0;

      /* Start a subfile for the current file of the state machine.  */
      if (lh->num_file_names >= file)
        {
          /* lh->include_dirs and lh->file_names are 0-based, but the
             directory and file name numbers in the statement program
             are 1-based.  */
          struct file_entry *fe = &lh->file_names[file - 1];
          char *dir;
          if (fe->dir_index)
            dir = lh->include_dirs[fe->dir_index - 1];
          else
            dir = comp_dir;
          dwarf2_start_subfile (fe->name, dir);
        }

      /* Decode the table. */
      while (!end_sequence)
        {
          op_code = read_1_byte (abfd, line_ptr);
          line_ptr += 1;

          if (op_code >= lh->opcode_base)
            {           /* Special operand.  */
              adj_opcode = op_code - lh->opcode_base;
              address += (adj_opcode / lh->line_range)
                * lh->minimum_instruction_length;
              line += lh->line_base + (adj_opcode % lh->line_range);
              /* append row to matrix using current values */
              record_line (current_subfile, line, 
                           check_cu_functions (address));
              basic_block = 1;
            }
          else switch (op_code)
            {
            case DW_LNS_extended_op:
              line_ptr += 1;    /* ignore length */
              extended_op = read_1_byte (abfd, line_ptr);
              line_ptr += 1;
              switch (extended_op)
                {
                case DW_LNE_end_sequence:
                  end_sequence = 1;
                  record_line (current_subfile, 0, address);
                  break;
                case DW_LNE_set_address:
                  address = read_address (abfd, line_ptr, cu_header, &bytes_read);
                  line_ptr += bytes_read;
                  address += baseaddr;
                  break;
                case DW_LNE_define_file:
                  {
                    char *cur_file;
                    unsigned int dir_index, mod_time, length;
                    
                    cur_file = read_string (abfd, line_ptr, &bytes_read);
                    line_ptr += bytes_read;
                    dir_index =
                      read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
                    line_ptr += bytes_read;
                    mod_time =
                      read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
                    line_ptr += bytes_read;
                    length =
                      read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
                    line_ptr += bytes_read;
                    add_file_name (lh, cur_file, dir_index, mod_time, length);
                  }
                  break;
                default:
                  complaint (&symfile_complaints,
                             "mangled .debug_line section");
                  return;
                }
              break;
            case DW_LNS_copy:
              record_line (current_subfile, line, 
                           check_cu_functions (address));
              basic_block = 0;
              break;
            case DW_LNS_advance_pc:
              address += lh->minimum_instruction_length
                * read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
              line_ptr += bytes_read;
              break;
            case DW_LNS_advance_line:
              line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
              line_ptr += bytes_read;
              break;
            case DW_LNS_set_file:
              {
                /* lh->include_dirs and lh->file_names are 0-based,
                   but the directory and file name numbers in the
                   statement program are 1-based.  */
                struct file_entry *fe;
                char *dir;
                file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
                line_ptr += bytes_read;
                fe = &lh->file_names[file - 1];
                if (fe->dir_index)
                  dir = lh->include_dirs[fe->dir_index - 1];
                else
                  dir = comp_dir;
                dwarf2_start_subfile (fe->name, dir);
              }
              break;
            case DW_LNS_set_column:
              column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
              line_ptr += bytes_read;
              break;
            case DW_LNS_negate_stmt:
              is_stmt = (!is_stmt);
              break;
            case DW_LNS_set_basic_block:
              basic_block = 1;
              break;
            /* Add to the address register of the state machine the
               address increment value corresponding to special opcode
               255.  Ie, this value is scaled by the minimum instruction
               length since special opcode 255 would have scaled the
               the increment.  */
            case DW_LNS_const_add_pc:
              address += (lh->minimum_instruction_length
                          * ((255 - lh->opcode_base) / lh->line_range));
              break;
            case DW_LNS_fixed_advance_pc:
              address += read_2_bytes (abfd, line_ptr);
              line_ptr += 2;
              break;
            default:
              {  /* Unknown standard opcode, ignore it.  */
                int i;
                for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
                  {
                    (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
                    line_ptr += bytes_read;
                  }
              }
            }
        }
    }
}

/* Start a subfile for DWARF.  FILENAME is the name of the file and
   DIRNAME the name of the source directory which contains FILENAME
   or NULL if not known.
   This routine tries to keep line numbers from identical absolute and
   relative file names in a common subfile.

   Using the `list' example from the GDB testsuite, which resides in
   /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
   of /srcdir/list0.c yields the following debugging information for list0.c:

   DW_AT_name:          /srcdir/list0.c
   DW_AT_comp_dir:              /compdir
   files.files[0].name: list0.h
   files.files[0].dir:  /srcdir
   files.files[1].name: list0.c
   files.files[1].dir:  /srcdir

   The line number information for list0.c has to end up in a single
   subfile, so that `break /srcdir/list0.c:1' works as expected.  */

static void
dwarf2_start_subfile (char *filename, char *dirname)
{
  /* If the filename isn't absolute, try to match an existing subfile
     with the full pathname.  */

  if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
    {
      struct subfile *subfile;
      char *fullname = concat (dirname, "/", filename, NULL);

      for (subfile = subfiles; subfile; subfile = subfile->next)
        {
          if (FILENAME_CMP (subfile->name, fullname) == 0)
            {
              current_subfile = subfile;
              xfree (fullname);
              return;
            }
        }
      xfree (fullname);
    }
  start_subfile (filename, dirname);
}

static void
var_decode_location (struct attribute *attr, struct symbol *sym,
                     struct objfile *objfile,
                     const struct comp_unit_head *cu_header)
{
  /* NOTE drow/2003-01-30: There used to be a comment and some special
     code here to turn a symbol with DW_AT_external and a
     SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol.  This was
     necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
     with some versions of binutils) where shared libraries could have
     relocations against symbols in their debug information - the
     minimal symbol would have the right address, but the debug info
     would not.  It's no longer necessary, because we will explicitly
     apply relocations when we read in the debug information now.  */

  /* A DW_AT_location attribute with no contents indicates that a
     variable has been optimized away.  */
  if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
    {
      SYMBOL_CLASS (sym) = LOC_OPTIMIZED_OUT;
      return;
    }

  /* Handle one degenerate form of location expression specially, to
     preserve GDB's previous behavior when section offsets are
     specified.  If this is just a DW_OP_addr then mark this symbol
     as LOC_STATIC.  */

  if (attr_form_is_block (attr)
      && DW_BLOCK (attr)->size == 1 + cu_header->addr_size
      && DW_BLOCK (attr)->data[0] == DW_OP_addr)
    {
      int dummy;

      SYMBOL_VALUE_ADDRESS (sym) =
        read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu_header,
                      &dummy);
      fixup_symbol_section (sym, objfile);
      SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
                                              SYMBOL_SECTION (sym));
      SYMBOL_CLASS (sym) = LOC_STATIC;
      return;
    }

  /* NOTE drow/2002-01-30: It might be worthwhile to have a static
     expression evaluator, and use LOC_COMPUTED only when necessary
     (i.e. when the value of a register or memory location is
     referenced, or a thread-local block, etc.).  Then again, it might
     not be worthwhile.  I'm assuming that it isn't unless performance
     or memory numbers show me otherwise.  */

  dwarf2_symbol_mark_computed (attr, sym, cu_header, objfile);
  SYMBOL_CLASS (sym) = LOC_COMPUTED;
}

/* Given a pointer to a DWARF information entry, figure out if we need
   to make a symbol table entry for it, and if so, create a new entry
   and return a pointer to it.
   If TYPE is NULL, determine symbol type from the die, otherwise
   used the passed type.  */

static struct symbol *
new_symbol (struct die_info *die, struct type *type, struct objfile *objfile,
            const struct comp_unit_head *cu_header)
{
  struct symbol *sym = NULL;
  char *name;
  struct attribute *attr = NULL;
  struct attribute *attr2 = NULL;
  CORE_ADDR addr = 0;

  name = dwarf2_linkage_name (die);
  if (name)
    {
      sym = (struct symbol *) obstack_alloc (&objfile->symbol_obstack,
                                             sizeof (struct symbol));
      OBJSTAT (objfile, n_syms++);
      memset (sym, 0, sizeof (struct symbol));

      /* Cache this symbol's name and the name's demangled form (if any).  */
      SYMBOL_LANGUAGE (sym) = cu_language;
      SYMBOL_SET_NAMES (sym, name, strlen (name), objfile);

      /* Default assumptions.
         Use the passed type or decode it from the die.  */
      SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
      SYMBOL_CLASS (sym) = LOC_STATIC;
      if (type != NULL)
        SYMBOL_TYPE (sym) = type;
      else
        SYMBOL_TYPE (sym) = die_type (die, objfile, cu_header);
      attr = dwarf_attr (die, DW_AT_decl_line);
      if (attr)
        {
          SYMBOL_LINE (sym) = DW_UNSND (attr);
        }
      switch (die->tag)
        {
        case DW_TAG_label:
          attr = dwarf_attr (die, DW_AT_low_pc);
          if (attr)
            {
              SYMBOL_VALUE_ADDRESS (sym) = DW_ADDR (attr) + baseaddr;
            }
          SYMBOL_CLASS (sym) = LOC_LABEL;
          break;
        case DW_TAG_subprogram:
          /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
             finish_block.  */
          SYMBOL_CLASS (sym) = LOC_BLOCK;
          attr2 = dwarf_attr (die, DW_AT_external);
          if (attr2 && (DW_UNSND (attr2) != 0))
            {
              add_symbol_to_list (sym, &global_symbols);
            }
          else
            {
              add_symbol_to_list (sym, list_in_scope);
            }
          break;
        case DW_TAG_variable:
          /* Compilation with minimal debug info may result in variables
             with missing type entries. Change the misleading `void' type
             to something sensible.  */
          if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
            SYMBOL_TYPE (sym) = init_type (TYPE_CODE_INT,
                                           TARGET_INT_BIT / HOST_CHAR_BIT, 0,
                                           "<variable, no debug info>",
                                           objfile);
          attr = dwarf_attr (die, DW_AT_const_value);
          if (attr)
            {
              dwarf2_const_value (attr, sym, objfile, cu_header);
              attr2 = dwarf_attr (die, DW_AT_external);
              if (attr2 && (DW_UNSND (attr2) != 0))
                add_symbol_to_list (sym, &global_symbols);
              else
                add_symbol_to_list (sym, list_in_scope);
              break;
            }
          attr = dwarf_attr (die, DW_AT_location);
          if (attr)
            {
              var_decode_location (attr, sym, objfile, cu_header);
              attr2 = dwarf_attr (die, DW_AT_external);
              if (attr2 && (DW_UNSND (attr2) != 0))
                add_symbol_to_list (sym, &global_symbols);
              else
                add_symbol_to_list (sym, list_in_scope);
            }
          else
            {
              /* We do not know the address of this symbol.
                 If it is an external symbol and we have type information
                 for it, enter the symbol as a LOC_UNRESOLVED symbol.
                 The address of the variable will then be determined from
                 the minimal symbol table whenever the variable is
                 referenced.  */
              attr2 = dwarf_attr (die, DW_AT_external);
              if (attr2 && (DW_UNSND (attr2) != 0)
                  && dwarf_attr (die, DW_AT_type) != NULL)
                {
                  SYMBOL_CLASS (sym) = LOC_UNRESOLVED;
                  add_symbol_to_list (sym, &global_symbols);
                }
            }
          break;
        case DW_TAG_formal_parameter:
          attr = dwarf_attr (die, DW_AT_location);
          if (attr)
            {
              SYMBOL_VALUE (sym) =
                decode_locdesc (DW_BLOCK (attr), objfile, cu_header);
              if (isreg)
                {
                  SYMBOL_CLASS (sym) = LOC_REGPARM;
                  SYMBOL_VALUE (sym) = 
                    DWARF2_REG_TO_REGNUM (SYMBOL_VALUE (sym));
                }
              else if (offreg)
                {
                  if (isderef)
                    {
                      if (basereg != frame_base_reg)
                        dwarf2_complex_location_expr_complaint ();
                      SYMBOL_CLASS (sym) = LOC_REF_ARG;
                    }
                  else
                    {
                      SYMBOL_CLASS (sym) = LOC_BASEREG_ARG;
                      SYMBOL_BASEREG (sym) = DWARF2_REG_TO_REGNUM (basereg);
                    }
                }
              else
                {
                  SYMBOL_CLASS (sym) = LOC_ARG;
                }
            }
          attr = dwarf_attr (die, DW_AT_const_value);
          if (attr)
            {
              dwarf2_const_value (attr, sym, objfile, cu_header);
            }
          add_symbol_to_list (sym, list_in_scope);
          break;
        case DW_TAG_unspecified_parameters:
          /* From varargs functions; gdb doesn't seem to have any
             interest in this information, so just ignore it for now.
             (FIXME?) */
          break;
        case DW_TAG_class_type:
        case DW_TAG_structure_type:
        case DW_TAG_union_type:
        case DW_TAG_enumeration_type:
          SYMBOL_CLASS (sym) = LOC_TYPEDEF;
          SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
          add_symbol_to_list (sym, list_in_scope);

          /* The semantics of C++ state that "struct foo { ... }" also
             defines a typedef for "foo". Synthesize a typedef symbol so
             that "ptype foo" works as expected.  */
          if (cu_language == language_cplus)
            {
              struct symbol *typedef_sym = (struct symbol *)
              obstack_alloc (&objfile->symbol_obstack,
                             sizeof (struct symbol));
              *typedef_sym = *sym;
              SYMBOL_DOMAIN (typedef_sym) = VAR_DOMAIN;
              if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
                TYPE_NAME (SYMBOL_TYPE (sym)) =
                  obsavestring (DEPRECATED_SYMBOL_NAME (sym),
                                strlen (DEPRECATED_SYMBOL_NAME (sym)),
                                &objfile->type_obstack);
              add_symbol_to_list (typedef_sym, list_in_scope);
            }
          break;
        case DW_TAG_typedef:
        case DW_TAG_base_type:
          SYMBOL_CLASS (sym) = LOC_TYPEDEF;
          SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
          add_symbol_to_list (sym, list_in_scope);
          break;
        case DW_TAG_enumerator:
          attr = dwarf_attr (die, DW_AT_const_value);
          if (attr)
            {
              dwarf2_const_value (attr, sym, objfile, cu_header);
            }
          add_symbol_to_list (sym, list_in_scope);
          break;
        default:
          /* Not a tag we recognize.  Hopefully we aren't processing
             trash data, but since we must specifically ignore things
             we don't recognize, there is nothing else we should do at
             this point. */
          complaint (&symfile_complaints, "unsupported tag: '%s'",
                     dwarf_tag_name (die->tag));
          break;
        }
    }
  return (sym);
}

/* Copy constant value from an attribute to a symbol.  */

static void
dwarf2_const_value (struct attribute *attr, struct symbol *sym,
                    struct objfile *objfile,
                    const struct comp_unit_head *cu_header)
{
  struct dwarf_block *blk;

  switch (attr->form)
    {
    case DW_FORM_addr:
      if (TYPE_LENGTH (SYMBOL_TYPE (sym)) != cu_header->addr_size)
        dwarf2_const_value_length_mismatch_complaint (DEPRECATED_SYMBOL_NAME (sym),
                                                      cu_header->addr_size,
                                                      TYPE_LENGTH (SYMBOL_TYPE
                                                                   (sym)));
      SYMBOL_VALUE_BYTES (sym) = (char *)
        obstack_alloc (&objfile->symbol_obstack, cu_header->addr_size);
      /* NOTE: cagney/2003-05-09: In-lined store_address call with
         it's body - store_unsigned_integer.  */
      store_unsigned_integer (SYMBOL_VALUE_BYTES (sym), cu_header->addr_size,
                              DW_ADDR (attr));
      SYMBOL_CLASS (sym) = LOC_CONST_BYTES;
      break;
    case DW_FORM_block1:
    case DW_FORM_block2:
    case DW_FORM_block4:
    case DW_FORM_block:
      blk = DW_BLOCK (attr);
      if (TYPE_LENGTH (SYMBOL_TYPE (sym)) != blk->size)
        dwarf2_const_value_length_mismatch_complaint (DEPRECATED_SYMBOL_NAME (sym),
                                                      blk->size,
                                                      TYPE_LENGTH (SYMBOL_TYPE
                                                                   (sym)));
      SYMBOL_VALUE_BYTES (sym) = (char *)
        obstack_alloc (&objfile->symbol_obstack, blk->size);
      memcpy (SYMBOL_VALUE_BYTES (sym), blk->data, blk->size);
      SYMBOL_CLASS (sym) = LOC_CONST_BYTES;
      break;

      /* The DW_AT_const_value attributes are supposed to carry the
         symbol's value "represented as it would be on the target
         architecture."  By the time we get here, it's already been
         converted to host endianness, so we just need to sign- or
         zero-extend it as appropriate.  */
    case DW_FORM_data1:
      dwarf2_const_value_data (attr, sym, 8);
      break;
    case DW_FORM_data2:
      dwarf2_const_value_data (attr, sym, 16);
      break;
    case DW_FORM_data4:
      dwarf2_const_value_data (attr, sym, 32);
      break;
    case DW_FORM_data8:
      dwarf2_const_value_data (attr, sym, 64);
      break;

    case DW_FORM_sdata:
      SYMBOL_VALUE (sym) = DW_SND (attr);
      SYMBOL_CLASS (sym) = LOC_CONST;
      break;

    case DW_FORM_udata:
      SYMBOL_VALUE (sym) = DW_UNSND (attr);
      SYMBOL_CLASS (sym) = LOC_CONST;
      break;

    default:
      complaint (&symfile_complaints,
                 "unsupported const value attribute form: '%s'",
                 dwarf_form_name (attr->form));
      SYMBOL_VALUE (sym) = 0;
      SYMBOL_CLASS (sym) = LOC_CONST;
      break;
    }
}


/* Given an attr with a DW_FORM_dataN value in host byte order, sign-
   or zero-extend it as appropriate for the symbol's type.  */
static void
dwarf2_const_value_data (struct attribute *attr,
                         struct symbol *sym,
                         int bits)
{
  LONGEST l = DW_UNSND (attr);

  if (bits < sizeof (l) * 8)
    {
      if (TYPE_UNSIGNED (SYMBOL_TYPE (sym)))
        l &= ((LONGEST) 1 << bits) - 1;
      else
        l = (l << (sizeof (l) * 8 - bits)) >> (sizeof (l) * 8 - bits);
    }

  SYMBOL_VALUE (sym) = l;
  SYMBOL_CLASS (sym) = LOC_CONST;
}


/* Return the type of the die in question using its DW_AT_type attribute.  */

static struct type *
die_type (struct die_info *die, struct objfile *objfile,
          const struct comp_unit_head *cu_header)
{
  struct type *type;
  struct attribute *type_attr;
  struct die_info *type_die;
  unsigned int ref;

  type_attr = dwarf_attr (die, DW_AT_type);
  if (!type_attr)
    {
      /* A missing DW_AT_type represents a void type.  */
      return dwarf2_fundamental_type (objfile, FT_VOID);
    }
  else
    {
      ref = dwarf2_get_ref_die_offset (type_attr);
      type_die = follow_die_ref (ref);
      if (!type_die)
        {
          error ("Dwarf Error: Cannot find referent at offset %d [in module %s]", 
                          ref, objfile->name);
          return NULL;
        }
    }
  type = tag_type_to_type (type_die, objfile, cu_header);
  if (!type)
    {
      dump_die (type_die);
      error ("Dwarf Error: Problem turning type die at offset into gdb type [in module %s]",
                      objfile->name);
    }
  return type;
}

/* Return the containing type of the die in question using its
   DW_AT_containing_type attribute.  */

static struct type *
die_containing_type (struct die_info *die, struct objfile *objfile,
                     const struct comp_unit_head *cu_header)
{
  struct type *type = NULL;
  struct attribute *type_attr;
  struct die_info *type_die = NULL;
  unsigned int ref;

  type_attr = dwarf_attr (die, DW_AT_containing_type);
  if (type_attr)
    {
      ref = dwarf2_get_ref_die_offset (type_attr);
      type_die = follow_die_ref (ref);
      if (!type_die)
        {
          error ("Dwarf Error: Cannot find referent at offset %d [in module %s]", ref, 
                          objfile->name);
          return NULL;
        }
      type = tag_type_to_type (type_die, objfile, cu_header);
    }
  if (!type)
    {
      if (type_die)
        dump_die (type_die);
      error ("Dwarf Error: Problem turning containing type into gdb type [in module %s]", 
                      objfile->name);
    }
  return type;
}

#if 0
static struct type *
type_at_offset (unsigned int offset, struct objfile *objfile)
{
  struct die_info *die;
  struct type *type;

  die = follow_die_ref (offset);
  if (!die)
    {
      error ("Dwarf Error: Cannot find type referent at offset %d.", offset);
      return NULL;
    }
  type = tag_type_to_type (die, objfile);
  return type;
}
#endif

static struct type *
tag_type_to_type (struct die_info *die, struct objfile *objfile,
                  const struct comp_unit_head *cu_header)
{
  if (die->type)
    {
      return die->type;
    }
  else
    {
      read_type_die (die, objfile, cu_header);
      if (!die->type)
        {
          dump_die (die);
          error ("Dwarf Error: Cannot find type of die [in module %s]", 
                          objfile->name);
        }
      return die->type;
    }
}

static void
read_type_die (struct die_info *die, struct objfile *objfile,
               const struct comp_unit_head *cu_header)
{
  switch (die->tag)
    {
    case DW_TAG_class_type:
    case DW_TAG_structure_type:
    case DW_TAG_union_type:
      read_structure_scope (die, objfile, cu_header);
      break;
    case DW_TAG_enumeration_type:
      read_enumeration (die, objfile, cu_header);
      break;
    case DW_TAG_subprogram:
    case DW_TAG_subroutine_type:
      read_subroutine_type (die, objfile, cu_header);
      break;
    case DW_TAG_array_type:
      read_array_type (die, objfile, cu_header);
      break;
    case DW_TAG_pointer_type:
      read_tag_pointer_type (die, objfile, cu_header);
      break;
    case DW_TAG_ptr_to_member_type:
      read_tag_ptr_to_member_type (die, objfile, cu_header);
      break;
    case DW_TAG_reference_type:
      read_tag_reference_type (die, objfile, cu_header);
      break;
    case DW_TAG_const_type:
      read_tag_const_type (die, objfile, cu_header);
      break;
    case DW_TAG_volatile_type:
      read_tag_volatile_type (die, objfile, cu_header);
      break;
    case DW_TAG_string_type:
      read_tag_string_type (die, objfile);
      break;
    case DW_TAG_typedef:
      read_typedef (die, objfile, cu_header);
      break;
    case DW_TAG_base_type:
      read_base_type (die, objfile);
      break;
    default:
      complaint (&symfile_complaints, "unexepected tag in read_type_die: '%s'",
                 dwarf_tag_name (die->tag));
      break;
    }
}

static struct type *
dwarf_base_type (int encoding, int size, struct objfile *objfile)
{
  /* FIXME - this should not produce a new (struct type *)
     every time.  It should cache base types.  */
  struct type *type;
  switch (encoding)
    {
    case DW_ATE_address:
      type = dwarf2_fundamental_type (objfile, FT_VOID);
      return type;
    case DW_ATE_boolean:
      type = dwarf2_fundamental_type (objfile, FT_BOOLEAN);
      return type;
    case DW_ATE_complex_float:
      if (size == 16)
        {
          type = dwarf2_fundamental_type (objfile, FT_DBL_PREC_COMPLEX);
        }
      else
        {
          type = dwarf2_fundamental_type (objfile, FT_COMPLEX);
        }
      return type;
    case DW_ATE_float:
      if (size == 8)
        {
          type = dwarf2_fundamental_type (objfile, FT_DBL_PREC_FLOAT);
        }
      else
        {
          type = dwarf2_fundamental_type (objfile, FT_FLOAT);
        }
      return type;
    case DW_ATE_signed:
      switch (size)
        {
        case 1:
          type = dwarf2_fundamental_type (objfile, FT_SIGNED_CHAR);
          break;
        case 2:
          type = dwarf2_fundamental_type (objfile, FT_SIGNED_SHORT);
          break;
        default:
        case 4:
          type = dwarf2_fundamental_type (objfile, FT_SIGNED_INTEGER);
          break;
        }
      return type;
    case DW_ATE_signed_char:
      type = dwarf2_fundamental_type (objfile, FT_SIGNED_CHAR);
      return type;
    case DW_ATE_unsigned:
      switch (size)
        {
        case 1:
          type = dwarf2_fundamental_type (objfile, FT_UNSIGNED_CHAR);
          break;
        case 2:
          type = dwarf2_fundamental_type (objfile, FT_UNSIGNED_SHORT);
          break;
        default:
        case 4:
          type = dwarf2_fundamental_type (objfile, FT_UNSIGNED_INTEGER);
          break;
        }
      return type;
    case DW_ATE_unsigned_char:
      type = dwarf2_fundamental_type (objfile, FT_UNSIGNED_CHAR);
      return type;
    default:
      type = dwarf2_fundamental_type (objfile, FT_SIGNED_INTEGER);
      return type;
    }
}

#if 0
struct die_info *
copy_die (struct die_info *old_die)
{
  struct die_info *new_die;
  int i, num_attrs;

  new_die = (struct die_info *) xmalloc (sizeof (struct die_info));
  memset (new_die, 0, sizeof (struct die_info));

  new_die->tag = old_die->tag;
  new_die->has_children = old_die->has_children;
  new_die->abbrev = old_die->abbrev;
  new_die->offset = old_die->offset;
  new_die->type = NULL;

  num_attrs = old_die->num_attrs;
  new_die->num_attrs = num_attrs;
  new_die->attrs = (struct attribute *)
    xmalloc (num_attrs * sizeof (struct attribute));

  for (i = 0; i < old_die->num_attrs; ++i)
    {
      new_die->attrs[i].name = old_die->attrs[i].name;
      new_die->attrs[i].form = old_die->attrs[i].form;
      new_die->attrs[i].u.addr = old_die->attrs[i].u.addr;
    }

  new_die->next = NULL;
  return new_die;
}
#endif

/* Return sibling of die, NULL if no sibling.  */

static struct die_info *
sibling_die (struct die_info *die)
{
  int nesting_level = 0;

  if (!die->has_children)
    {
      if (die->next && (die->next->tag == 0))
        {
          return NULL;
        }
      else
        {
          return die->next;
        }
    }
  else
    {
      do
        {
          if (die->has_children)
            {
              nesting_level++;
            }
          if (die->tag == 0)
            {
              nesting_level--;
            }
          die = die->next;
        }
      while (nesting_level);
      if (die && (die->tag == 0))
        {
          return NULL;
        }
      else
        {
          return die;
        }
    }
}

/* Get linkage name of a die, return NULL if not found.  */

static char *
dwarf2_linkage_name (struct die_info *die)
{
  struct attribute *attr;

  attr = dwarf_attr (die, DW_AT_MIPS_linkage_name);
  if (attr && DW_STRING (attr))
    return DW_STRING (attr);
  attr = dwarf_attr (die, DW_AT_name);
  if (attr && DW_STRING (attr))
    return DW_STRING (attr);
  return NULL;
}

/* Get name of a die, return NULL if not found.  */

static char *
dwarf2_name (struct die_info *die)
{
  struct attribute *attr;

  attr = dwarf_attr (die, DW_AT_name);
  if (attr && DW_STRING (attr))
    return DW_STRING (attr);
  return NULL;
}

/* Return the die that this die in an extension of, or NULL if there
   is none.  */

static struct die_info *
dwarf2_extension (struct die_info *die)
{
  struct attribute *attr;
  struct die_info *extension_die;
  unsigned int ref;

  attr = dwarf_attr (die, DW_AT_extension);
  if (attr == NULL)
    return NULL;

  ref = dwarf2_get_ref_die_offset (attr);
  extension_die = follow_die_ref (ref);
  if (!extension_die)
    {
      error ("Dwarf Error: Cannot find referent at offset %d.", ref);
    }

  return extension_die;
}

/* Convert a DIE tag into its string name.  */

static char *
dwarf_tag_name (register unsigned tag)
{
  switch (tag)
    {
    case DW_TAG_padding:
      return "DW_TAG_padding";
    case DW_TAG_array_type:
      return "DW_TAG_array_type";
    case DW_TAG_class_type:
      return "DW_TAG_class_type";
    case DW_TAG_entry_point:
      return "DW_TAG_entry_point";
    case DW_TAG_enumeration_type:
      return "DW_TAG_enumeration_type";
    case DW_TAG_formal_parameter:
      return "DW_TAG_formal_parameter";
    case DW_TAG_imported_declaration:
      return "DW_TAG_imported_declaration";
    case DW_TAG_label:
      return "DW_TAG_label";
    case DW_TAG_lexical_block:
      return "DW_TAG_lexical_block";
    case DW_TAG_member:
      return "DW_TAG_member";
    case DW_TAG_pointer_type:
      return "DW_TAG_pointer_type";
    case DW_TAG_reference_type:
      return "DW_TAG_reference_type";
    case DW_TAG_compile_unit:
      return "DW_TAG_compile_unit";
    case DW_TAG_string_type:
      return "DW_TAG_string_type";
    case DW_TAG_structure_type:
      return "DW_TAG_structure_type";
    case DW_TAG_subroutine_type:
      return "DW_TAG_subroutine_type";
    case DW_TAG_typedef:
      return "DW_TAG_typedef";
    case DW_TAG_union_type:
      return "DW_TAG_union_type";
    case DW_TAG_unspecified_parameters:
      return "DW_TAG_unspecified_parameters";
    case DW_TAG_variant:
      return "DW_TAG_variant";
    case DW_TAG_common_block:
      return "DW_TAG_common_block";
    case DW_TAG_common_inclusion:
      return "DW_TAG_common_inclusion";
    case DW_TAG_inheritance:
      return "DW_TAG_inheritance";
    case DW_TAG_inlined_subroutine:
      return "DW_TAG_inlined_subroutine";
    case DW_TAG_module:
      return "DW_TAG_module";
    case DW_TAG_ptr_to_member_type:
      return "DW_TAG_ptr_to_member_type";
    case DW_TAG_set_type:
      return "DW_TAG_set_type";
    case DW_TAG_subrange_type:
      return "DW_TAG_subrange_type";
    case DW_TAG_with_stmt:
      return "DW_TAG_with_stmt";
    case DW_TAG_access_declaration:
      return "DW_TAG_access_declaration";
    case DW_TAG_base_type:
      return "DW_TAG_base_type";
    case DW_TAG_catch_block:
      return "DW_TAG_catch_block";
    case DW_TAG_const_type:
      return "DW_TAG_const_type";
    case DW_TAG_constant:
      return "DW_TAG_constant";
    case DW_TAG_enumerator:
      return "DW_TAG_enumerator";
    case DW_TAG_file_type:
      return "DW_TAG_file_type";
    case DW_TAG_friend:
      return "DW_TAG_friend";
    case DW_TAG_namelist:
      return "DW_TAG_namelist";
    case DW_TAG_namelist_item:
      return "DW_TAG_namelist_item";
    case DW_TAG_packed_type:
      return "DW_TAG_packed_type";
    case DW_TAG_subprogram:
      return "DW_TAG_subprogram";
    case DW_TAG_template_type_param:
      return "DW_TAG_template_type_param";
    case DW_TAG_template_value_param:
      return "DW_TAG_template_value_param";
    case DW_TAG_thrown_type:
      return "DW_TAG_thrown_type";
    case DW_TAG_try_block:
      return "DW_TAG_try_block";
    case DW_TAG_variant_part:
      return "DW_TAG_variant_part";
    case DW_TAG_variable:
      return "DW_TAG_variable";
    case DW_TAG_volatile_type:
      return "DW_TAG_volatile_type";
    case DW_TAG_dwarf_procedure:
      return "DW_TAG_dwarf_procedure";
    case DW_TAG_restrict_type:
      return "DW_TAG_restrict_type";
    case DW_TAG_interface_type:
      return "DW_TAG_interface_type";
    case DW_TAG_namespace:
      return "DW_TAG_namespace";
    case DW_TAG_imported_module:
      return "DW_TAG_imported_module";
    case DW_TAG_unspecified_type:
      return "DW_TAG_unspecified_type";
    case DW_TAG_partial_unit:
      return "DW_TAG_partial_unit";
    case DW_TAG_imported_unit:
      return "DW_TAG_imported_unit";
    case DW_TAG_MIPS_loop:
      return "DW_TAG_MIPS_loop";
    case DW_TAG_format_label:
      return "DW_TAG_format_label";
    case DW_TAG_function_template:
      return "DW_TAG_function_template";
    case DW_TAG_class_template:
      return "DW_TAG_class_template";
    default:
      return "DW_TAG_<unknown>";
    }
}

/* Convert a DWARF attribute code into its string name.  */

static char *
dwarf_attr_name (register unsigned attr)
{
  switch (attr)
    {
    case DW_AT_sibling:
      return "DW_AT_sibling";
    case DW_AT_location:
      return "DW_AT_location";
    case DW_AT_name:
      return "DW_AT_name";
    case DW_AT_ordering:
      return "DW_AT_ordering";
    case DW_AT_subscr_data:
      return "DW_AT_subscr_data";
    case DW_AT_byte_size:
      return "DW_AT_byte_size";
    case DW_AT_bit_offset:
      return "DW_AT_bit_offset";
    case DW_AT_bit_size:
      return "DW_AT_bit_size";
    case DW_AT_element_list:
      return "DW_AT_element_list";
    case DW_AT_stmt_list:
      return "DW_AT_stmt_list";
    case DW_AT_low_pc:
      return "DW_AT_low_pc";
    case DW_AT_high_pc:
      return "DW_AT_high_pc";
    case DW_AT_language:
      return "DW_AT_language";
    case DW_AT_member:
      return "DW_AT_member";
    case DW_AT_discr:
      return "DW_AT_discr";
    case DW_AT_discr_value:
      return "DW_AT_discr_value";
    case DW_AT_visibility:
      return "DW_AT_visibility";
    case DW_AT_import:
      return "DW_AT_import";
    case DW_AT_string_length:
      return "DW_AT_string_length";
    case DW_AT_common_reference:
      return "DW_AT_common_reference";
    case DW_AT_comp_dir:
      return "DW_AT_comp_dir";
    case DW_AT_const_value:
      return "DW_AT_const_value";
    case DW_AT_containing_type:
      return "DW_AT_containing_type";
    case DW_AT_default_value:
      return "DW_AT_default_value";
    case DW_AT_inline:
      return "DW_AT_inline";
    case DW_AT_is_optional:
      return "DW_AT_is_optional";
    case DW_AT_lower_bound:
      return "DW_AT_lower_bound";
    case DW_AT_producer:
      return "DW_AT_producer";
    case DW_AT_prototyped:
      return "DW_AT_prototyped";
    case DW_AT_return_addr:
      return "DW_AT_return_addr";
    case DW_AT_start_scope:
      return "DW_AT_start_scope";
    case DW_AT_stride_size:
      return "DW_AT_stride_size";
    case DW_AT_upper_bound:
      return "DW_AT_upper_bound";
    case DW_AT_abstract_origin:
      return "DW_AT_abstract_origin";
    case DW_AT_accessibility:
      return "DW_AT_accessibility";
    case DW_AT_address_class:
      return "DW_AT_address_class";
    case DW_AT_artificial:
      return "DW_AT_artificial";
    case DW_AT_base_types:
      return "DW_AT_base_types";
    case DW_AT_calling_convention:
      return "DW_AT_calling_convention";
    case DW_AT_count:
      return "DW_AT_count";
    case DW_AT_data_member_location:
      return "DW_AT_data_member_location";
    case DW_AT_decl_column:
      return "DW_AT_decl_column";
    case DW_AT_decl_file:
      return "DW_AT_decl_file";
    case DW_AT_decl_line:
      return "DW_AT_decl_line";
    case DW_AT_declaration:
      return "DW_AT_declaration";
    case DW_AT_discr_list:
      return "DW_AT_discr_list";
    case DW_AT_encoding:
      return "DW_AT_encoding";
    case DW_AT_external:
      return "DW_AT_external";
    case DW_AT_frame_base:
      return "DW_AT_frame_base";
    case DW_AT_friend:
      return "DW_AT_friend";
    case DW_AT_identifier_case:
      return "DW_AT_identifier_case";
    case DW_AT_macro_info:
      return "DW_AT_macro_info";
    case DW_AT_namelist_items:
      return "DW_AT_namelist_items";
    case DW_AT_priority:
      return "DW_AT_priority";
    case DW_AT_segment:
      return "DW_AT_segment";
    case DW_AT_specification:
      return "DW_AT_specification";
    case DW_AT_static_link:
      return "DW_AT_static_link";
    case DW_AT_type:
      return "DW_AT_type";
    case DW_AT_use_location:
      return "DW_AT_use_location";
    case DW_AT_variable_parameter:
      return "DW_AT_variable_parameter";
    case DW_AT_virtuality:
      return "DW_AT_virtuality";
    case DW_AT_vtable_elem_location:
      return "DW_AT_vtable_elem_location";
    case DW_AT_allocated:
      return "DW_AT_allocated";
    case DW_AT_associated:
      return "DW_AT_associated";
    case DW_AT_data_location:
      return "DW_AT_data_location";
    case DW_AT_stride:
      return "DW_AT_stride";
    case DW_AT_entry_pc:
      return "DW_AT_entry_pc";
    case DW_AT_use_UTF8:
      return "DW_AT_use_UTF8";
    case DW_AT_extension:
      return "DW_AT_extension";
    case DW_AT_ranges:
      return "DW_AT_ranges";
    case DW_AT_trampoline:
      return "DW_AT_trampoline";
    case DW_AT_call_column:
      return "DW_AT_call_column";
    case DW_AT_call_file:
      return "DW_AT_call_file";
    case DW_AT_call_line:
      return "DW_AT_call_line";
#ifdef MIPS
    case DW_AT_MIPS_fde:
      return "DW_AT_MIPS_fde";
    case DW_AT_MIPS_loop_begin:
      return "DW_AT_MIPS_loop_begin";
    case DW_AT_MIPS_tail_loop_begin:
      return "DW_AT_MIPS_tail_loop_begin";
    case DW_AT_MIPS_epilog_begin:
      return "DW_AT_MIPS_epilog_begin";
    case DW_AT_MIPS_loop_unroll_factor:
      return "DW_AT_MIPS_loop_unroll_factor";
    case DW_AT_MIPS_software_pipeline_depth:
      return "DW_AT_MIPS_software_pipeline_depth";
    case DW_AT_MIPS_linkage_name:
      return "DW_AT_MIPS_linkage_name";
#endif

    case DW_AT_sf_names:
      return "DW_AT_sf_names";
    case DW_AT_src_info:
      return "DW_AT_src_info";
    case DW_AT_mac_info:
      return "DW_AT_mac_info";
    case DW_AT_src_coords:
      return "DW_AT_src_coords";
    case DW_AT_body_begin:
      return "DW_AT_body_begin";
    case DW_AT_body_end:
      return "DW_AT_body_end";
    case DW_AT_GNU_vector:
      return "DW_AT_GNU_vector";
    default:
      return "DW_AT_<unknown>";
    }
}

/* Convert a DWARF value form code into its string name.  */

static char *
dwarf_form_name (register unsigned form)
{
  switch (form)
    {
    case DW_FORM_addr:
      return "DW_FORM_addr";
    case DW_FORM_block2:
      return "DW_FORM_block2";
    case DW_FORM_block4:
      return "DW_FORM_block4";
    case DW_FORM_data2:
      return "DW_FORM_data2";
    case DW_FORM_data4:
      return "DW_FORM_data4";
    case DW_FORM_data8:
      return "DW_FORM_data8";
    case DW_FORM_string:
      return "DW_FORM_string";
    case DW_FORM_block:
      return "DW_FORM_block";
    case DW_FORM_block1:
      return "DW_FORM_block1";
    case DW_FORM_data1:
      return "DW_FORM_data1";
    case DW_FORM_flag:
      return "DW_FORM_flag";
    case DW_FORM_sdata:
      return "DW_FORM_sdata";
    case DW_FORM_strp:
      return "DW_FORM_strp";
    case DW_FORM_udata:
      return "DW_FORM_udata";
    case DW_FORM_ref_addr:
      return "DW_FORM_ref_addr";
    case DW_FORM_ref1:
      return "DW_FORM_ref1";
    case DW_FORM_ref2:
      return "DW_FORM_ref2";
    case DW_FORM_ref4:
      return "DW_FORM_ref4";
    case DW_FORM_ref8:
      return "DW_FORM_ref8";
    case DW_FORM_ref_udata:
      return "DW_FORM_ref_udata";
    case DW_FORM_indirect:
      return "DW_FORM_indirect";
    default:
      return "DW_FORM_<unknown>";
    }
}

/* Convert a DWARF stack opcode into its string name.  */

static char *
dwarf_stack_op_name (register unsigned op)
{
  switch (op)
    {
    case DW_OP_addr:
      return "DW_OP_addr";
    case DW_OP_deref:
      return "DW_OP_deref";
    case DW_OP_const1u:
      return "DW_OP_const1u";
    case DW_OP_const1s:
      return "DW_OP_const1s";
    case DW_OP_const2u:
      return "DW_OP_const2u";
    case DW_OP_const2s:
      return "DW_OP_const2s";
    case DW_OP_const4u:
      return "DW_OP_const4u";
    case DW_OP_const4s:
      return "DW_OP_const4s";
    case DW_OP_const8u:
      return "DW_OP_const8u";
    case DW_OP_const8s:
      return "DW_OP_const8s";
    case DW_OP_constu:
      return "DW_OP_constu";
    case DW_OP_consts:
      return "DW_OP_consts";
    case DW_OP_dup:
      return "DW_OP_dup";
    case DW_OP_drop:
      return "DW_OP_drop";
    case DW_OP_over:
      return "DW_OP_over";
    case DW_OP_pick:
      return "DW_OP_pick";
    case DW_OP_swap:
      return "DW_OP_swap";
    case DW_OP_rot:
      return "DW_OP_rot";
    case DW_OP_xderef:
      return "DW_OP_xderef";
    case DW_OP_abs:
      return "DW_OP_abs";
    case DW_OP_and:
      return "DW_OP_and";
    case DW_OP_div:
      return "DW_OP_div";
    case DW_OP_minus:
      return "DW_OP_minus";
    case DW_OP_mod:
      return "DW_OP_mod";
    case DW_OP_mul:
      return "DW_OP_mul";
    case DW_OP_neg:
      return "DW_OP_neg";
    case DW_OP_not:
      return "DW_OP_not";
    case DW_OP_or:
      return "DW_OP_or";
    case DW_OP_plus:
      return "DW_OP_plus";
    case DW_OP_plus_uconst:
      return "DW_OP_plus_uconst";
    case DW_OP_shl:
      return "DW_OP_shl";
    case DW_OP_shr:
      return "DW_OP_shr";
    case DW_OP_shra:
      return "DW_OP_shra";
    case DW_OP_xor:
      return "DW_OP_xor";
    case DW_OP_bra:
      return "DW_OP_bra";
    case DW_OP_eq:
      return "DW_OP_eq";
    case DW_OP_ge:
      return "DW_OP_ge";
    case DW_OP_gt:
      return "DW_OP_gt";
    case DW_OP_le:
      return "DW_OP_le";
    case DW_OP_lt:
      return "DW_OP_lt";
    case DW_OP_ne:
      return "DW_OP_ne";
    case DW_OP_skip:
      return "DW_OP_skip";
    case DW_OP_lit0:
      return "DW_OP_lit0";
    case DW_OP_lit1:
      return "DW_OP_lit1";
    case DW_OP_lit2:
      return "DW_OP_lit2";
    case DW_OP_lit3:
      return "DW_OP_lit3";
    case DW_OP_lit4:
      return "DW_OP_lit4";
    case DW_OP_lit5:
      return "DW_OP_lit5";
    case DW_OP_lit6:
      return "DW_OP_lit6";
    case DW_OP_lit7:
      return "DW_OP_lit7";
    case DW_OP_lit8:
      return "DW_OP_lit8";
    case DW_OP_lit9:
      return "DW_OP_lit9";
    case DW_OP_lit10:
      return "DW_OP_lit10";
    case DW_OP_lit11:
      return "DW_OP_lit11";
    case DW_OP_lit12:
      return "DW_OP_lit12";
    case DW_OP_lit13:
      return "DW_OP_lit13";
    case DW_OP_lit14:
      return "DW_OP_lit14";
    case DW_OP_lit15:
      return "DW_OP_lit15";
    case DW_OP_lit16:
      return "DW_OP_lit16";
    case DW_OP_lit17:
      return "DW_OP_lit17";
    case DW_OP_lit18:
      return "DW_OP_lit18";
    case DW_OP_lit19:
      return "DW_OP_lit19";
    case DW_OP_lit20:
      return "DW_OP_lit20";
    case DW_OP_lit21:
      return "DW_OP_lit21";
    case DW_OP_lit22:
      return "DW_OP_lit22";
    case DW_OP_lit23:
      return "DW_OP_lit23";
    case DW_OP_lit24:
      return "DW_OP_lit24";
    case DW_OP_lit25:
      return "DW_OP_lit25";
    case DW_OP_lit26:
      return "DW_OP_lit26";
    case DW_OP_lit27:
      return "DW_OP_lit27";
    case DW_OP_lit28:
      return "DW_OP_lit28";
    case DW_OP_lit29:
      return "DW_OP_lit29";
    case DW_OP_lit30:
      return "DW_OP_lit30";
    case DW_OP_lit31:
      return "DW_OP_lit31";
    case DW_OP_reg0:
      return "DW_OP_reg0";
    case DW_OP_reg1:
      return "DW_OP_reg1";
    case DW_OP_reg2:
      return "DW_OP_reg2";
    case DW_OP_reg3:
      return "DW_OP_reg3";
    case DW_OP_reg4:
      return "DW_OP_reg4";
    case DW_OP_reg5:
      return "DW_OP_reg5";
    case DW_OP_reg6:
      return "DW_OP_reg6";
    case DW_OP_reg7:
      return "DW_OP_reg7";
    case DW_OP_reg8:
      return "DW_OP_reg8";
    case DW_OP_reg9:
      return "DW_OP_reg9";
    case DW_OP_reg10:
      return "DW_OP_reg10";
    case DW_OP_reg11:
      return "DW_OP_reg11";
    case DW_OP_reg12:
      return "DW_OP_reg12";
    case DW_OP_reg13:
      return "DW_OP_reg13";
    case DW_OP_reg14:
      return "DW_OP_reg14";
    case DW_OP_reg15:
      return "DW_OP_reg15";
    case DW_OP_reg16:
      return "DW_OP_reg16";
    case DW_OP_reg17:
      return "DW_OP_reg17";
    case DW_OP_reg18:
      return "DW_OP_reg18";
    case DW_OP_reg19:
      return "DW_OP_reg19";
    case DW_OP_reg20:
      return "DW_OP_reg20";
    case DW_OP_reg21:
      return "DW_OP_reg21";
    case DW_OP_reg22:
      return "DW_OP_reg22";
    case DW_OP_reg23:
      return "DW_OP_reg23";
    case DW_OP_reg24:
      return "DW_OP_reg24";
    case DW_OP_reg25:
      return "DW_OP_reg25";
    case DW_OP_reg26:
      return "DW_OP_reg26";
    case DW_OP_reg27:
      return "DW_OP_reg27";
    case DW_OP_reg28:
      return "DW_OP_reg28";
    case DW_OP_reg29:
      return "DW_OP_reg29";
    case DW_OP_reg30:
      return "DW_OP_reg30";
    case DW_OP_reg31:
      return "DW_OP_reg31";
    case DW_OP_breg0:
      return "DW_OP_breg0";
    case DW_OP_breg1:
      return "DW_OP_breg1";
    case DW_OP_breg2:
      return "DW_OP_breg2";
    case DW_OP_breg3:
      return "DW_OP_breg3";
    case DW_OP_breg4:
      return "DW_OP_breg4";
    case DW_OP_breg5:
      return "DW_OP_breg5";
    case DW_OP_breg6:
      return "DW_OP_breg6";
    case DW_OP_breg7:
      return "DW_OP_breg7";
    case DW_OP_breg8:
      return "DW_OP_breg8";
    case DW_OP_breg9:
      return "DW_OP_breg9";
    case DW_OP_breg10:
      return "DW_OP_breg10";
    case DW_OP_breg11:
      return "DW_OP_breg11";
    case DW_OP_breg12:
      return "DW_OP_breg12";
    case DW_OP_breg13:
      return "DW_OP_breg13";
    case DW_OP_breg14:
      return "DW_OP_breg14";
    case DW_OP_breg15:
      return "DW_OP_breg15";
    case DW_OP_breg16:
      return "DW_OP_breg16";
    case DW_OP_breg17:
      return "DW_OP_breg17";
    case DW_OP_breg18:
      return "DW_OP_breg18";
    case DW_OP_breg19:
      return "DW_OP_breg19";
    case DW_OP_breg20:
      return "DW_OP_breg20";
    case DW_OP_breg21:
      return "DW_OP_breg21";
    case DW_OP_breg22:
      return "DW_OP_breg22";
    case DW_OP_breg23:
      return "DW_OP_breg23";
    case DW_OP_breg24:
      return "DW_OP_breg24";
    case DW_OP_breg25:
      return "DW_OP_breg25";
    case DW_OP_breg26:
      return "DW_OP_breg26";
    case DW_OP_breg27:
      return "DW_OP_breg27";
    case DW_OP_breg28:
      return "DW_OP_breg28";
    case DW_OP_breg29:
      return "DW_OP_breg29";
    case DW_OP_breg30:
      return "DW_OP_breg30";
    case DW_OP_breg31:
      return "DW_OP_breg31";
    case DW_OP_regx:
      return "DW_OP_regx";
    case DW_OP_fbreg:
      return "DW_OP_fbreg";
    case DW_OP_bregx:
      return "DW_OP_bregx";
    case DW_OP_piece:
      return "DW_OP_piece";
    case DW_OP_deref_size:
      return "DW_OP_deref_size";
    case DW_OP_xderef_size:
      return "DW_OP_xderef_size";
    case DW_OP_nop:
      return "DW_OP_nop";
      /* DWARF 3 extensions.  */
    case DW_OP_push_object_address:
      return "DW_OP_push_object_address";
    case DW_OP_call2:
      return "DW_OP_call2";
    case DW_OP_call4:
      return "DW_OP_call4";
    case DW_OP_call_ref:
      return "DW_OP_call_ref";
      /* GNU extensions.  */
    case DW_OP_GNU_push_tls_address:
      return "DW_OP_GNU_push_tls_address";
    default:
      return "OP_<unknown>";
    }
}

static char *
dwarf_bool_name (unsigned mybool)
{
  if (mybool)
    return "TRUE";
  else
    return "FALSE";
}

/* Convert a DWARF type code into its string name.  */

static char *
dwarf_type_encoding_name (register unsigned enc)
{
  switch (enc)
    {
    case DW_ATE_address:
      return "DW_ATE_address";
    case DW_ATE_boolean:
      return "DW_ATE_boolean";
    case DW_ATE_complex_float:
      return "DW_ATE_complex_float";
    case DW_ATE_float:
      return "DW_ATE_float";
    case DW_ATE_signed:
      return "DW_ATE_signed";
    case DW_ATE_signed_char:
      return "DW_ATE_signed_char";
    case DW_ATE_unsigned:
      return "DW_ATE_unsigned";
    case DW_ATE_unsigned_char:
      return "DW_ATE_unsigned_char";
    case DW_ATE_imaginary_float:
      return "DW_ATE_imaginary_float";
    default:
      return "DW_ATE_<unknown>";
    }
}

/* Convert a DWARF call frame info operation to its string name. */

#if 0
static char *
dwarf_cfi_name (register unsigned cfi_opc)
{
  switch (cfi_opc)
    {
    case DW_CFA_advance_loc:
      return "DW_CFA_advance_loc";
    case DW_CFA_offset:
      return "DW_CFA_offset";
    case DW_CFA_restore:
      return "DW_CFA_restore";
    case DW_CFA_nop:
      return "DW_CFA_nop";
    case DW_CFA_set_loc:
      return "DW_CFA_set_loc";
    case DW_CFA_advance_loc1:
      return "DW_CFA_advance_loc1";
    case DW_CFA_advance_loc2:
      return "DW_CFA_advance_loc2";
    case DW_CFA_advance_loc4:
      return "DW_CFA_advance_loc4";
    case DW_CFA_offset_extended:
      return "DW_CFA_offset_extended";
    case DW_CFA_restore_extended:
      return "DW_CFA_restore_extended";
    case DW_CFA_undefined:
      return "DW_CFA_undefined";
    case DW_CFA_same_value:
      return "DW_CFA_same_value";
    case DW_CFA_register:
      return "DW_CFA_register";
    case DW_CFA_remember_state:
      return "DW_CFA_remember_state";
    case DW_CFA_restore_state:
      return "DW_CFA_restore_state";
    case DW_CFA_def_cfa:
      return "DW_CFA_def_cfa";
    case DW_CFA_def_cfa_register:
      return "DW_CFA_def_cfa_register";
    case DW_CFA_def_cfa_offset:
      return "DW_CFA_def_cfa_offset";

    /* DWARF 3 */
    case DW_CFA_def_cfa_expression:
      return "DW_CFA_def_cfa_expression";
    case DW_CFA_expression:
      return "DW_CFA_expression";
    case DW_CFA_offset_extended_sf:
      return "DW_CFA_offset_extended_sf";
    case DW_CFA_def_cfa_sf:
      return "DW_CFA_def_cfa_sf";
    case DW_CFA_def_cfa_offset_sf:
      return "DW_CFA_def_cfa_offset_sf";

      /* SGI/MIPS specific */
    case DW_CFA_MIPS_advance_loc8:
      return "DW_CFA_MIPS_advance_loc8";

    /* GNU extensions */
    case DW_CFA_GNU_window_save:
      return "DW_CFA_GNU_window_save";
    case DW_CFA_GNU_args_size:
      return "DW_CFA_GNU_args_size";
    case DW_CFA_GNU_negative_offset_extended:
      return "DW_CFA_GNU_negative_offset_extended";

    default:
      return "DW_CFA_<unknown>";
    }
}
#endif

static void
dump_die (struct die_info *die)
{
  unsigned int i;

  fprintf_unfiltered (gdb_stderr, "Die: %s (abbrev = %d, offset = %d)\n",
           dwarf_tag_name (die->tag), die->abbrev, die->offset);
  fprintf_unfiltered (gdb_stderr, "\thas children: %s\n",
           dwarf_bool_name (die->has_children));

  fprintf_unfiltered (gdb_stderr, "\tattributes:\n");
  for (i = 0; i < die->num_attrs; ++i)
    {
      fprintf_unfiltered (gdb_stderr, "\t\t%s (%s) ",
               dwarf_attr_name (die->attrs[i].name),
               dwarf_form_name (die->attrs[i].form));
      switch (die->attrs[i].form)
        {
        case DW_FORM_ref_addr:
        case DW_FORM_addr:
          fprintf_unfiltered (gdb_stderr, "address: ");
          print_address_numeric (DW_ADDR (&die->attrs[i]), 1, gdb_stderr);
          break;
        case DW_FORM_block2:
        case DW_FORM_block4:
        case DW_FORM_block:
        case DW_FORM_block1:
          fprintf_unfiltered (gdb_stderr, "block: size %d", DW_BLOCK (&die->attrs[i])->size);
          break;
        case DW_FORM_data1:
        case DW_FORM_data2:
        case DW_FORM_data4:
        case DW_FORM_data8:
        case DW_FORM_ref1:
        case DW_FORM_ref2:
        case DW_FORM_ref4:
        case DW_FORM_udata:
        case DW_FORM_sdata:
          fprintf_unfiltered (gdb_stderr, "constant: %ld", DW_UNSND (&die->attrs[i]));
          break;
        case DW_FORM_string:
        case DW_FORM_strp:
          fprintf_unfiltered (gdb_stderr, "string: \"%s\"",
                   DW_STRING (&die->attrs[i])
                   ? DW_STRING (&die->attrs[i]) : "");
          break;
        case DW_FORM_flag:
          if (DW_UNSND (&die->attrs[i]))
            fprintf_unfiltered (gdb_stderr, "flag: TRUE");
          else
            fprintf_unfiltered (gdb_stderr, "flag: FALSE");
          break;
        case DW_FORM_indirect:
          /* the reader will have reduced the indirect form to
             the "base form" so this form should not occur */
          fprintf_unfiltered (gdb_stderr, "unexpected attribute form: DW_FORM_indirect");
          break;
        default:
          fprintf_unfiltered (gdb_stderr, "unsupported attribute form: %d.",
                   die->attrs[i].form);
        }
      fprintf_unfiltered (gdb_stderr, "\n");
    }
}

static void
dump_die_list (struct die_info *die)
{
  while (die)
    {
      dump_die (die);
      die = die->next;
    }
}

static void
store_in_ref_table (unsigned int offset, struct die_info *die)
{
  int h;
  struct die_info *old;

  h = (offset % REF_HASH_SIZE);
  old = die_ref_table[h];
  die->next_ref = old;
  die_ref_table[h] = die;
}


static void
dwarf2_empty_hash_tables (void)
{
  memset (die_ref_table, 0, sizeof (die_ref_table));
}

static unsigned int
dwarf2_get_ref_die_offset (struct attribute *attr)
{
  unsigned int result = 0;

  switch (attr->form)
    {
    case DW_FORM_ref_addr:
      result = DW_ADDR (attr);
      break;
    case DW_FORM_ref1:
    case DW_FORM_ref2:
    case DW_FORM_ref4:
    case DW_FORM_ref8:
    case DW_FORM_ref_udata:
      result = cu_header_offset + DW_UNSND (attr);
      break;
    default:
      complaint (&symfile_complaints,
                 "unsupported die ref attribute form: '%s'",
                 dwarf_form_name (attr->form));
    }
  return result;
}

static struct die_info *
follow_die_ref (unsigned int offset)
{
  struct die_info *die;
  int h;

  h = (offset % REF_HASH_SIZE);
  die = die_ref_table[h];
  while (die)
    {
      if (die->offset == offset)
        {
          return die;
        }
      die = die->next_ref;
    }
  return NULL;
}

static struct type *
dwarf2_fundamental_type (struct objfile *objfile, int typeid)
{
  if (typeid < 0 || typeid >= FT_NUM_MEMBERS)
    {
      error ("Dwarf Error: internal error - invalid fundamental type id %d [in module %s]",
             typeid, objfile->name);
    }

  /* Look for this particular type in the fundamental type vector.  If
     one is not found, create and install one appropriate for the
     current language and the current target machine. */

  if (ftypes[typeid] == NULL)
    {
      ftypes[typeid] = cu_language_defn->la_fund_type (objfile, typeid);
    }

  return (ftypes[typeid]);
}

/* Decode simple location descriptions.
   Given a pointer to a dwarf block that defines a location, compute
   the location and return the value.

   FIXME: This is a kludge until we figure out a better
   way to handle the location descriptions.
   Gdb's design does not mesh well with the DWARF2 notion of a location
   computing interpreter, which is a shame because the flexibility goes unused.
   FIXME: Implement more operations as necessary.

   A location description containing no operations indicates that the
   object is optimized out. The global optimized_out flag is set for
   those, the return value is meaningless.

   When the result is a register number, the global isreg flag is set,
   otherwise it is cleared.

   When the result is a base register offset, the global offreg flag is set
   and the register number is returned in basereg, otherwise it is cleared.

   When the DW_OP_fbreg operation is encountered without a corresponding
   DW_AT_frame_base attribute, the global islocal flag is set.
   Hopefully the machine dependent code knows how to set up a virtual
   frame pointer for the local references.

   Note that stack[0] is unused except as a default error return.
   Note that stack overflow is not yet handled.  */

static CORE_ADDR
decode_locdesc (struct dwarf_block *blk, struct objfile *objfile,
                const struct comp_unit_head *cu_header)
{
  int i;
  int size = blk->size;
  char *data = blk->data;
  CORE_ADDR stack[64];
  int stacki;
  unsigned int bytes_read, unsnd;
  unsigned char op;

  i = 0;
  stacki = 0;
  stack[stacki] = 0;
  isreg = 0;
  offreg = 0;
  isderef = 0;
  islocal = 0;
  is_thread_local = 0;
  optimized_out = 1;

  while (i < size)
    {
      optimized_out = 0;
      op = data[i++];
      switch (op)
        {
        case DW_OP_lit0:
        case DW_OP_lit1:
        case DW_OP_lit2:
        case DW_OP_lit3:
        case DW_OP_lit4:
        case DW_OP_lit5:
        case DW_OP_lit6:
        case DW_OP_lit7:
        case DW_OP_lit8:
        case DW_OP_lit9:
        case DW_OP_lit10:
        case DW_OP_lit11:
        case DW_OP_lit12:
        case DW_OP_lit13:
        case DW_OP_lit14:
        case DW_OP_lit15:
        case DW_OP_lit16:
        case DW_OP_lit17:
        case DW_OP_lit18:
        case DW_OP_lit19:
        case DW_OP_lit20:
        case DW_OP_lit21:
        case DW_OP_lit22:
        case DW_OP_lit23:
        case DW_OP_lit24:
        case DW_OP_lit25:
        case DW_OP_lit26:
        case DW_OP_lit27:
        case DW_OP_lit28:
        case DW_OP_lit29:
        case DW_OP_lit30:
        case DW_OP_lit31:
          stack[++stacki] = op - DW_OP_lit0;
          break;

        case DW_OP_reg0:
        case DW_OP_reg1:
        case DW_OP_reg2:
        case DW_OP_reg3:
        case DW_OP_reg4:
        case DW_OP_reg5:
        case DW_OP_reg6:
        case DW_OP_reg7:
        case DW_OP_reg8:
        case DW_OP_reg9:
        case DW_OP_reg10:
        case DW_OP_reg11:
        case DW_OP_reg12:
        case DW_OP_reg13:
        case DW_OP_reg14:
        case DW_OP_reg15:
        case DW_OP_reg16:
        case DW_OP_reg17:
        case DW_OP_reg18:
        case DW_OP_reg19:
        case DW_OP_reg20:
        case DW_OP_reg21:
        case DW_OP_reg22:
        case DW_OP_reg23:
        case DW_OP_reg24:
        case DW_OP_reg25:
        case DW_OP_reg26:
        case DW_OP_reg27:
        case DW_OP_reg28:
        case DW_OP_reg29:
        case DW_OP_reg30:
        case DW_OP_reg31:
          isreg = 1;
          stack[++stacki] = op - DW_OP_reg0;
          break;

        case DW_OP_regx:
          isreg = 1;
          unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
          i += bytes_read;
          stack[++stacki] = unsnd;
          break;

        case DW_OP_breg0:
        case DW_OP_breg1:
        case DW_OP_breg2:
        case DW_OP_breg3:
        case DW_OP_breg4:
        case DW_OP_breg5:
        case DW_OP_breg6:
        case DW_OP_breg7:
        case DW_OP_breg8:
        case DW_OP_breg9:
        case DW_OP_breg10:
        case DW_OP_breg11:
        case DW_OP_breg12:
        case DW_OP_breg13:
        case DW_OP_breg14:
        case DW_OP_breg15:
        case DW_OP_breg16:
        case DW_OP_breg17:
        case DW_OP_breg18:
        case DW_OP_breg19:
        case DW_OP_breg20:
        case DW_OP_breg21:
        case DW_OP_breg22:
        case DW_OP_breg23:
        case DW_OP_breg24:
        case DW_OP_breg25:
        case DW_OP_breg26:
        case DW_OP_breg27:
        case DW_OP_breg28:
        case DW_OP_breg29:
        case DW_OP_breg30:
        case DW_OP_breg31:
          offreg = 1;
          basereg = op - DW_OP_breg0;
          stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
          i += bytes_read;
          break;

        case DW_OP_bregx:
          offreg = 1;
          basereg = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
          i += bytes_read;
          stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
          i += bytes_read;
          break;

        case DW_OP_fbreg:
          stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
          i += bytes_read;
          if (frame_base_reg >= 0)
            {
              offreg = 1;
              basereg = frame_base_reg;
              stack[stacki] += frame_base_offset;
            }
          else
            {
              complaint (&symfile_complaints,
                         "DW_AT_frame_base missing for DW_OP_fbreg");
              islocal = 1;
            }
          break;

        case DW_OP_addr:
          stack[++stacki] = read_address (objfile->obfd, &data[i],
                                          cu_header, &bytes_read);
          i += bytes_read;
          break;

        case DW_OP_const1u:
          stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
          i += 1;
          break;

        case DW_OP_const1s:
          stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
          i += 1;
          break;

        case DW_OP_const2u:
          stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
          i += 2;
          break;

        case DW_OP_const2s:
          stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
          i += 2;
          break;

        case DW_OP_const4u:
          stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
          i += 4;
          break;

        case DW_OP_const4s:
          stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
          i += 4;
          break;

        case DW_OP_constu:
          stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
                                                  &bytes_read);
          i += bytes_read;
          break;

        case DW_OP_consts:
          stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
          i += bytes_read;
          break;

        case DW_OP_dup:
          stack[stacki + 1] = stack[stacki];
          stacki++;
          break;

        case DW_OP_plus:
          stack[stacki - 1] += stack[stacki];
          stacki--;
          break;

        case DW_OP_plus_uconst:
          stack[stacki] += read_unsigned_leb128 (NULL, (data + i), &bytes_read);
          i += bytes_read;
          break;

        case DW_OP_minus:
          stack[stacki - 1] -= stack[stacki];
          stacki--;
          break;

        case DW_OP_deref:
          isderef = 1;
          /* If we're not the last op, then we definitely can't encode
             this using GDB's address_class enum.  */
          if (i < size)
            dwarf2_complex_location_expr_complaint ();
          break;

        case DW_OP_GNU_push_tls_address:
          is_thread_local = 1;
          /* The top of the stack has the offset from the beginning
             of the thread control block at which the variable is located.  */
          /* Nothing should follow this operator, so the top of stack would
             be returned.  */
          if (i < size)
            dwarf2_complex_location_expr_complaint ();
          break;

        default:
          complaint (&symfile_complaints, "unsupported stack op: '%s'",
                     dwarf_stack_op_name (op));
          return (stack[stacki]);
        }
    }
  return (stack[stacki]);
}

/* memory allocation interface */

/* ARGSUSED */
static void
dwarf2_free_tmp_obstack (void *ignore)
{
  obstack_free (&dwarf2_tmp_obstack, NULL);
}

static struct dwarf_block *
dwarf_alloc_block (void)
{
  struct dwarf_block *blk;

  blk = (struct dwarf_block *)
    obstack_alloc (&dwarf2_tmp_obstack, sizeof (struct dwarf_block));
  return (blk);
}

static struct abbrev_info *
dwarf_alloc_abbrev (void)
{
  struct abbrev_info *abbrev;

  abbrev = (struct abbrev_info *) xmalloc (sizeof (struct abbrev_info));
  memset (abbrev, 0, sizeof (struct abbrev_info));
  return (abbrev);
}

static struct die_info *
dwarf_alloc_die (void)
{
  struct die_info *die;

  die = (struct die_info *) xmalloc (sizeof (struct die_info));
  memset (die, 0, sizeof (struct die_info));
  return (die);
}

\f
/* Macro support.  */


/* Return the full name of file number I in *LH's file name table.
   Use COMP_DIR as the name of the current directory of the
   compilation.  The result is allocated using xmalloc; the caller is
   responsible for freeing it.  */
static char *
file_full_name (int file, struct line_header *lh, const char *comp_dir)
{
  struct file_entry *fe = &lh->file_names[file - 1];
  
  if (IS_ABSOLUTE_PATH (fe->name))
    return xstrdup (fe->name);
  else
    {
      const char *dir;
      int dir_len;
      char *full_name;

      if (fe->dir_index)
        dir = lh->include_dirs[fe->dir_index - 1];
      else
        dir = comp_dir;

      if (dir)
        {
          dir_len = strlen (dir);
          full_name = xmalloc (dir_len + 1 + strlen (fe->name) + 1);
          strcpy (full_name, dir);
          full_name[dir_len] = '/';
          strcpy (full_name + dir_len + 1, fe->name);
          return full_name;
        }
      else
        return xstrdup (fe->name);
    }
}


static struct macro_source_file *
macro_start_file (int file, int line,
                  struct macro_source_file *current_file,
                  const char *comp_dir,
                  struct line_header *lh, struct objfile *objfile)
{
  /* The full name of this source file.  */
  char *full_name = file_full_name (file, lh, comp_dir);

  /* We don't create a macro table for this compilation unit
     at all until we actually get a filename.  */
  if (! pending_macros)
    pending_macros = new_macro_table (&objfile->symbol_obstack,
                                      objfile->macro_cache);

  if (! current_file)
    /* If we have no current file, then this must be the start_file
       directive for the compilation unit's main source file.  */
    current_file = macro_set_main (pending_macros, full_name);
  else
    current_file = macro_include (current_file, line, full_name);

  xfree (full_name);
              
  return current_file;
}


/* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
   followed by a null byte.  */
static char *
copy_string (const char *buf, int len)
{
  char *s = xmalloc (len + 1);
  memcpy (s, buf, len);
  s[len] = '\0';

  return s;
}


static const char *
consume_improper_spaces (const char *p, const char *body)
{
  if (*p == ' ')
    {
      complaint (&symfile_complaints,
                 "macro definition contains spaces in formal argument list:\n`%s'",
                 body);

      while (*p == ' ')
        p++;
    }

  return p;
}


static void
parse_macro_definition (struct macro_source_file *file, int line,
                        const char *body)
{
  const char *p;

  /* The body string takes one of two forms.  For object-like macro
     definitions, it should be:

        <macro name> " " <definition>

     For function-like macro definitions, it should be:

        <macro name> "() " <definition>
     or
        <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>

     Spaces may appear only where explicitly indicated, and in the
     <definition>.

     The Dwarf 2 spec says that an object-like macro's name is always
     followed by a space, but versions of GCC around March 2002 omit
     the space when the macro's definition is the empty string. 

     The Dwarf 2 spec says that there should be no spaces between the
     formal arguments in a function-like macro's formal argument list,
     but versions of GCC around March 2002 include spaces after the
     commas.  */


  /* Find the extent of the macro name.  The macro name is terminated
     by either a space or null character (for an object-like macro) or
     an opening paren (for a function-like macro).  */
  for (p = body; *p; p++)
    if (*p == ' ' || *p == '(')
      break;

  if (*p == ' ' || *p == '\0')
    {
      /* It's an object-like macro.  */
      int name_len = p - body;
      char *name = copy_string (body, name_len);
      const char *replacement;

      if (*p == ' ')
        replacement = body + name_len + 1;
      else
        {
          dwarf2_macro_malformed_definition_complaint (body);
          replacement = body + name_len;
        }
      
      macro_define_object (file, line, name, replacement);

      xfree (name);
    }
  else if (*p == '(')
    {
      /* It's a function-like macro.  */
      char *name = copy_string (body, p - body);
      int argc = 0;
      int argv_size = 1;
      char **argv = xmalloc (argv_size * sizeof (*argv));

      p++;

      p = consume_improper_spaces (p, body);

      /* Parse the formal argument list.  */
      while (*p && *p != ')')
        {
          /* Find the extent of the current argument name.  */
          const char *arg_start = p;

          while (*p && *p != ',' && *p != ')' && *p != ' ')
            p++;

          if (! *p || p == arg_start)
            dwarf2_macro_malformed_definition_complaint (body);
          else
            {
              /* Make sure argv has room for the new argument.  */
              if (argc >= argv_size)
                {
                  argv_size *= 2;
                  argv = xrealloc (argv, argv_size * sizeof (*argv));
                }

              argv[argc++] = copy_string (arg_start, p - arg_start);
            }

          p = consume_improper_spaces (p, body);

          /* Consume the comma, if present.  */
          if (*p == ',')
            {
              p++;

              p = consume_improper_spaces (p, body);
            }
        }

      if (*p == ')')
        {
          p++;

          if (*p == ' ')
            /* Perfectly formed definition, no complaints.  */
            macro_define_function (file, line, name,
                                   argc, (const char **) argv, 
                                   p + 1);
          else if (*p == '\0')
            {
              /* Complain, but do define it.  */
              dwarf2_macro_malformed_definition_complaint (body);
              macro_define_function (file, line, name,
                                     argc, (const char **) argv, 
                                     p);
            }
          else
            /* Just complain.  */
            dwarf2_macro_malformed_definition_complaint (body);
        }
      else
        /* Just complain.  */
        dwarf2_macro_malformed_definition_complaint (body);

      xfree (name);
      {
        int i;

        for (i = 0; i < argc; i++)
          xfree (argv[i]);
      }
      xfree (argv);
    }
  else
    dwarf2_macro_malformed_definition_complaint (body);
}


static void
dwarf_decode_macros (struct line_header *lh, unsigned int offset,
                     char *comp_dir, bfd *abfd,
                     const struct comp_unit_head *cu_header,
                     struct objfile *objfile)
{
  char *mac_ptr, *mac_end;
  struct macro_source_file *current_file = 0;

  if (dwarf_macinfo_buffer == NULL)
    {
      complaint (&symfile_complaints, "missing .debug_macinfo section");
      return;
    }

  mac_ptr = dwarf_macinfo_buffer + offset;
  mac_end = dwarf_macinfo_buffer + dwarf_macinfo_size;

  for (;;)
    {
      enum dwarf_macinfo_record_type macinfo_type;

      /* Do we at least have room for a macinfo type byte?  */
      if (mac_ptr >= mac_end)
        {
          dwarf2_macros_too_long_complaint ();
          return;
        }

      macinfo_type = read_1_byte (abfd, mac_ptr);
      mac_ptr++;

      switch (macinfo_type)
        {
          /* A zero macinfo type indicates the end of the macro
             information.  */
        case 0:
          return;

        case DW_MACINFO_define:
        case DW_MACINFO_undef:
          {
            int bytes_read;
            int line;
            char *body;

            line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
            mac_ptr += bytes_read;
            body = read_string (abfd, mac_ptr, &bytes_read);
            mac_ptr += bytes_read;

            if (! current_file)
              complaint (&symfile_complaints,
                         "debug info gives macro %s outside of any file: %s",
                         macinfo_type ==
                         DW_MACINFO_define ? "definition" : macinfo_type ==
                         DW_MACINFO_undef ? "undefinition" :
                         "something-or-other", body);
            else
              {
                if (macinfo_type == DW_MACINFO_define)
                  parse_macro_definition (current_file, line, body);
                else if (macinfo_type == DW_MACINFO_undef)
                  macro_undef (current_file, line, body);
              }
          }
          break;

        case DW_MACINFO_start_file:
          {
            int bytes_read;
            int line, file;

            line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
            mac_ptr += bytes_read;
            file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
            mac_ptr += bytes_read;

            current_file = macro_start_file (file, line,
                                             current_file, comp_dir,
                                             lh, objfile);
          }
          break;

        case DW_MACINFO_end_file:
          if (! current_file)
            complaint (&symfile_complaints,
                       "macro debug info has an unmatched `close_file' directive");
          else
            {
              current_file = current_file->included_by;
              if (! current_file)
                {
                  enum dwarf_macinfo_record_type next_type;

                  /* GCC circa March 2002 doesn't produce the zero
                     type byte marking the end of the compilation
                     unit.  Complain if it's not there, but exit no
                     matter what.  */

                  /* Do we at least have room for a macinfo type byte?  */
                  if (mac_ptr >= mac_end)
                    {
                      dwarf2_macros_too_long_complaint ();
                      return;
                    }

                  /* We don't increment mac_ptr here, so this is just
                     a look-ahead.  */
                  next_type = read_1_byte (abfd, mac_ptr);
                  if (next_type != 0)
                    complaint (&symfile_complaints,
                               "no terminating 0-type entry for macros in `.debug_macinfo' section");

                  return;
                }
            }
          break;

        case DW_MACINFO_vendor_ext:
          {
            int bytes_read;
            int constant;
            char *string;

            constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
            mac_ptr += bytes_read;
            string = read_string (abfd, mac_ptr, &bytes_read);
            mac_ptr += bytes_read;

            /* We don't recognize any vendor extensions.  */
          }
          break;
        }
    }
}

/* Check if the attribute's form is a DW_FORM_block*
   if so return true else false. */
static int
attr_form_is_block (struct attribute *attr)
{
  return (attr == NULL ? 0 :
      attr->form == DW_FORM_block1
      || attr->form == DW_FORM_block2
      || attr->form == DW_FORM_block4
      || attr->form == DW_FORM_block);
}

static void
dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym,
                             const struct comp_unit_head *cu_header,
                             struct objfile *objfile)
{
  if (attr->form == DW_FORM_data4 || attr->form == DW_FORM_data8)
    {
      struct dwarf2_loclist_baton *baton;

      baton = obstack_alloc (&objfile->symbol_obstack,
                             sizeof (struct dwarf2_loclist_baton));
      baton->objfile = objfile;

      /* We don't know how long the location list is, but make sure we
         don't run off the edge of the section.  */
      baton->size = dwarf_loc_size - DW_UNSND (attr);
      baton->data = dwarf_loc_buffer + DW_UNSND (attr);
      baton->base_address = cu_header->base_address;
      if (cu_header->base_known == 0)
        complaint (&symfile_complaints,
                   "Location list used without specifying the CU base address.");

      SYMBOL_LOCATION_FUNCS (sym) = &dwarf2_loclist_funcs;
      SYMBOL_LOCATION_BATON (sym) = baton;
    }
  else
    {
      struct dwarf2_locexpr_baton *baton;

      baton = obstack_alloc (&objfile->symbol_obstack,
                             sizeof (struct dwarf2_locexpr_baton));
      baton->objfile = objfile;

      if (attr_form_is_block (attr))
        {
          /* Note that we're just copying the block's data pointer
             here, not the actual data.  We're still pointing into the
             dwarf_info_buffer for SYM's objfile; right now we never
             release that buffer, but when we do clean up properly
             this may need to change.  */
          baton->size = DW_BLOCK (attr)->size;
          baton->data = DW_BLOCK (attr)->data;
        }
      else
        {
          dwarf2_invalid_attrib_class_complaint ("location description",
                                                 SYMBOL_NATURAL_NAME (sym));
          baton->size = 0;
          baton->data = NULL;
        }
      
      SYMBOL_LOCATION_FUNCS (sym) = &dwarf2_locexpr_funcs;
      SYMBOL_LOCATION_BATON (sym) = baton;
    }
}