DIGEST: Documentation

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

/* dwarf.c -- display DWARF contents of a BFD binary file
   Copyright (C) 2005-2023 Free Software Foundation, Inc.

   This file is part of GNU Binutils.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

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

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
   02110-1301, USA.  */

#include "sysdep.h"
#include "libiberty.h"
#include "bfd.h"
#include <stdint.h>
#include "bucomm.h"
#include "elfcomm.h"
#include "elf/common.h"
#include "dwarf2.h"
#include "dwarf.h"
#include "gdb/gdb-index.h"
#include "filenames.h"
#include "safe-ctype.h"
#include <assert.h>

#ifdef HAVE_LIBDEBUGINFOD
#include <elfutils/debuginfod.h>
#endif

#include <limits.h>
#ifndef CHAR_BIT
#define CHAR_BIT 8
#endif

#ifndef ENABLE_CHECKING
#define ENABLE_CHECKING 0
#endif

#undef MAX
#undef MIN
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))

static const char *regname (unsigned int regno, int row);
static const char *regname_internal_by_table_only (unsigned int regno);

static int have_frame_base;
static int need_base_address;

static unsigned int num_debug_info_entries = 0;
static unsigned int alloc_num_debug_info_entries = 0;
static debug_info *debug_information = NULL;
/* Special value for num_debug_info_entries to indicate
   that the .debug_info section could not be loaded/parsed.  */
#define DEBUG_INFO_UNAVAILABLE  (unsigned int) -1

/* A .debug_info section can contain multiple links to separate
   DWO object files.  We use these structures to record these links.  */
typedef enum dwo_type
{
 DWO_NAME,
 DWO_DIR,
 DWO_ID
} dwo_type;

typedef struct dwo_info
{
  dwo_type          type;
  const char *      value;
  uint64_t          cu_offset;
  struct dwo_info * next;
} dwo_info;

static dwo_info *first_dwo_info = NULL;
static bool need_dwo_info;

separate_info * first_separate_info = NULL;

unsigned int eh_addr_size;

int do_debug_info;
int do_debug_abbrevs;
int do_debug_lines;
int do_debug_pubnames;
int do_debug_pubtypes;
int do_debug_aranges;
int do_debug_ranges;
int do_debug_frames;
int do_debug_frames_interp;
int do_debug_macinfo;
int do_debug_str;
int do_debug_str_offsets;
int do_debug_loc;
int do_gdb_index;
int do_trace_info;
int do_trace_abbrevs;
int do_trace_aranges;
int do_debug_addr;
int do_debug_cu_index;
int do_wide;
int do_debug_links;
int do_follow_links = DEFAULT_FOR_FOLLOW_LINKS;
#ifdef HAVE_LIBDEBUGINFOD
int use_debuginfod = 1;
#endif
bool do_checks;

int dwarf_cutoff_level = -1;
unsigned long dwarf_start_die;

int dwarf_check = 0;

/* Collection of CU/TU section sets from .debug_cu_index and .debug_tu_index
   sections.  For version 1 package files, each set is stored in SHNDX_POOL
   as a zero-terminated list of section indexes comprising one set of debug
   sections from a .dwo file.  */

static unsigned int *shndx_pool = NULL;
static unsigned int shndx_pool_size = 0;
static unsigned int shndx_pool_used = 0;

/* For version 2 package files, each set contains an array of section offsets
   and an array of section sizes, giving the offset and size of the
   contribution from a CU or TU within one of the debug sections.
   When displaying debug info from a package file, we need to use these
   tables to locate the corresponding contributions to each section.  */

struct cu_tu_set
{
  uint64_t signature;
  uint64_t section_offsets[DW_SECT_MAX];
  size_t   section_sizes[DW_SECT_MAX];
};

static int cu_count = 0;
static int tu_count = 0;
static struct cu_tu_set *cu_sets = NULL;
static struct cu_tu_set *tu_sets = NULL;

static bool load_cu_tu_indexes (void *);

/* An array that indicates for a given level of CU nesting whether
   the latest DW_AT_type seen for that level was a signed type or
   an unsigned type.  */
#define MAX_CU_NESTING (1 << 8)
static bool level_type_signed[MAX_CU_NESTING];

/* Values for do_debug_lines.  */
#define FLAG_DEBUG_LINES_RAW     1
#define FLAG_DEBUG_LINES_DECODED 2

static unsigned int
size_of_encoded_value (int encoding)
{
  switch (encoding & 0x7)
    {
    default:    /* ??? */
    case 0:     return eh_addr_size;
    case 2:     return 2;
    case 3:     return 4;
    case 4:     return 8;
    }
}

static uint64_t
get_encoded_value (unsigned char **pdata,
                   int encoding,
                   struct dwarf_section *section,
                   unsigned char * end)
{
  unsigned char * data = * pdata;
  unsigned int size = size_of_encoded_value (encoding);
  uint64_t val;

  if (data >= end || size > (size_t) (end - data))
    {
      warn (_("Encoded value extends past end of section\n"));
      * pdata = end;
      return 0;
    }

  /* PR 17512: file: 002-829853-0.004.  */
  if (size > 8)
    {
      warn (_("Encoded size of %d is too large to read\n"), size);
      * pdata = end;
      return 0;
    }

  /* PR 17512: file: 1085-5603-0.004.  */
  if (size == 0)
    {
      warn (_("Encoded size of 0 is too small to read\n"));
      * pdata = end;
      return 0;
    }

  if (encoding & DW_EH_PE_signed)
    val = byte_get_signed (data, size);
  else
    val = byte_get (data, size);

  if ((encoding & 0x70) == DW_EH_PE_pcrel)
    val += section->address + (data - section->start);

  * pdata = data + size;
  return val;
}

/* Print a uint64_t value (typically an address, offset or length) in
   hexadecimal format, followed by a space.  The precision displayed is
   determined by the NUM_BYTES parameter.  */

static void
print_hex (uint64_t value, unsigned num_bytes)
{
  if (num_bytes == 0)
    num_bytes = 2;

  printf ("%0*" PRIx64 " ", num_bytes * 2,
          value & ~(~(uint64_t) 0 << num_bytes * 4 << num_bytes * 4));
}

/* Like print_hex, but no trailing space.  */

static void
print_hex_ns (uint64_t value, unsigned num_bytes)
{
  if (num_bytes == 0)
    num_bytes = 2;

  printf ("%0*" PRIx64, num_bytes * 2,
          value & ~(~(uint64_t) 0 << num_bytes * 4 << num_bytes * 4));
}

/* Print a view number in hexadecimal value, with the same width as
   print_hex would have printed it.  */

static void
print_view (uint64_t value, unsigned num_bytes)
{
  if (num_bytes == 0)
    num_bytes = 2;

  printf ("v%0*" PRIx64 " ", num_bytes * 2 - 1,
          value & ~(~(uint64_t) 0 << num_bytes * 4 << num_bytes * 4));
}

static const char *
null_name (const char *p)
{
  if (p == NULL)
    p = _("unknown");
  return p;
}

/* Read in a LEB128 encoded value starting at address DATA.
   If SIGN is true, return a signed LEB128 value.
   If LENGTH_RETURN is not NULL, return in it the number of bytes read.
   If STATUS_RETURN is not NULL, return with bit 0 (LSB) set if the
   terminating byte was not found and with bit 1 set if the value
   overflows a uint64_t.
   No bytes will be read at address END or beyond.  */

uint64_t
read_leb128 (unsigned char *data,
             const unsigned char *const end,
             bool sign,
             unsigned int *length_return,
             int *status_return)
{
  uint64_t result = 0;
  unsigned int num_read = 0;
  unsigned int shift = 0;
  int status = 1;

  while (data < end)
    {
      unsigned char byte = *data++;
      unsigned char lost, mask;

      num_read++;

      if (shift < CHAR_BIT * sizeof (result))
        {
          result |= ((uint64_t) (byte & 0x7f)) << shift;
          /* These bits overflowed.  */
          lost = byte ^ (result >> shift);
          /* And this is the mask of possible overflow bits.  */
          mask = 0x7f ^ ((uint64_t) 0x7f << shift >> shift);
          shift += 7;
        }
      else
        {
          lost = byte;
          mask = 0x7f;
        }
      if ((lost & mask) != (sign && (int64_t) result < 0 ? mask : 0))
        status |= 2;

      if ((byte & 0x80) == 0)
        {
          status &= ~1;
          if (sign && shift < CHAR_BIT * sizeof (result) && (byte & 0x40))
            result |= -((uint64_t) 1 << shift);
          break;
        }
    }

  if (length_return != NULL)
    *length_return = num_read;
  if (status_return != NULL)
    *status_return = status;

  return result;
}

/* Read AMOUNT bytes from PTR and store them in VAL.
   Checks to make sure that the read will not reach or pass END.
   FUNC chooses whether the value read is unsigned or signed, and may
   be either byte_get or byte_get_signed.  If INC is true, PTR is
   incremented after reading the value.
   This macro cannot protect against PTR values derived from user input.
   The C standard sections 6.5.6 and 6.5.8 say attempts to do so using
   pointers is undefined behaviour.  */
#define SAFE_BYTE_GET_INTERNAL(VAL, PTR, AMOUNT, END, FUNC, INC)        \
  do                                                                    \
    {                                                                   \
      size_t amount = (AMOUNT);                                         \
      if (sizeof (VAL) < amount)                                        \
        {                                                               \
          error (ngettext ("internal error: attempt to read %d byte "   \
                           "of data in to %d sized variable",           \
                           "internal error: attempt to read %d bytes "  \
                           "of data in to %d sized variable",           \
                           amount),                                     \
                 (int) amount, (int) sizeof (VAL));                     \
          amount = sizeof (VAL);                                        \
        }                                                               \
      if (ENABLE_CHECKING)                                              \
        assert ((PTR) <= (END));                                        \
      size_t avail = (END) - (PTR);                                     \
      if ((PTR) > (END))                                                \
        avail = 0;                                                      \
      if (amount > avail)                                               \
        amount = avail;                                                 \
      if (amount == 0)                                                  \
        (VAL) = 0;                                                      \
      else                                                              \
        (VAL) = (FUNC) ((PTR), amount);                                 \
      if (INC)                                                          \
        (PTR) += amount;                                                \
    }                                                                   \
  while (0)

#define SAFE_BYTE_GET(VAL, PTR, AMOUNT, END)    \
  SAFE_BYTE_GET_INTERNAL (VAL, PTR, AMOUNT, END, byte_get, false)

#define SAFE_BYTE_GET_AND_INC(VAL, PTR, AMOUNT, END)    \
  SAFE_BYTE_GET_INTERNAL (VAL, PTR, AMOUNT, END, byte_get, true)

#define SAFE_SIGNED_BYTE_GET(VAL, PTR, AMOUNT, END)     \
  SAFE_BYTE_GET_INTERNAL (VAL, PTR, AMOUNT, END, byte_get_signed, false)

#define SAFE_SIGNED_BYTE_GET_AND_INC(VAL, PTR, AMOUNT, END)     \
  SAFE_BYTE_GET_INTERNAL (VAL, PTR, AMOUNT, END, byte_get_signed, true)

typedef struct State_Machine_Registers
{
  uint64_t address;
  unsigned int view;
  unsigned int file;
  unsigned int line;
  unsigned int column;
  int is_stmt;
  int basic_block;
  unsigned char op_index;
  unsigned char end_sequence;
  /* This variable hold the number of the last entry seen
     in the File Table.  */
  unsigned int last_file_entry;
} SMR;

static SMR state_machine_regs;

static void
reset_state_machine (int is_stmt)
{
  state_machine_regs.address = 0;
  state_machine_regs.view = 0;
  state_machine_regs.op_index = 0;
  state_machine_regs.file = 1;
  state_machine_regs.line = 1;
  state_machine_regs.column = 0;
  state_machine_regs.is_stmt = is_stmt;
  state_machine_regs.basic_block = 0;
  state_machine_regs.end_sequence = 0;
  state_machine_regs.last_file_entry = 0;
}

/* Handled an extend line op.
   Returns the number of bytes read.  */

static size_t
process_extended_line_op (unsigned char * data,
                          int is_stmt,
                          unsigned char * end)
{
  unsigned char op_code;
  size_t len, header_len;
  unsigned char *name;
  unsigned char *orig_data = data;
  uint64_t adr, val;

  READ_ULEB (len, data, end);
  header_len = data - orig_data;

  if (len == 0 || data >= end || len > (size_t) (end - data))
    {
      warn (_("Badly formed extended line op encountered!\n"));
      return header_len;
    }

  op_code = *data++;

  printf (_("  Extended opcode %d: "), op_code);

  switch (op_code)
    {
    case DW_LNE_end_sequence:
      printf (_("End of Sequence\n\n"));
      reset_state_machine (is_stmt);
      break;

    case DW_LNE_set_address:
      /* PR 17512: file: 002-100480-0.004.  */
      if (len - 1 > 8)
        {
          warn (_("Length (%zu) of DW_LNE_set_address op is too long\n"),
                len - 1);
          adr = 0;
        }
      else
        SAFE_BYTE_GET (adr, data, len - 1, end);
      printf (_("set Address to %#" PRIx64 "\n"), adr);
      state_machine_regs.address = adr;
      state_machine_regs.view = 0;
      state_machine_regs.op_index = 0;
      break;

    case DW_LNE_define_file:
      printf (_("define new File Table entry\n"));
      printf (_("  Entry\tDir\tTime\tSize\tName\n"));
      printf ("   %d\t", ++state_machine_regs.last_file_entry);

      {
        size_t l;

        name = data;
        l = strnlen ((char *) data, end - data);
        data += l;
        if (data < end)
          data++;
        READ_ULEB (val, data, end);
        printf ("%" PRIu64 "\t", val);
        READ_ULEB (val, data, end);
        printf ("%" PRIu64 "\t", val);
        READ_ULEB (val, data, end);
        printf ("%" PRIu64 "\t", val);
        printf ("%.*s\n\n", (int) l, name);
      }

      if (((size_t) (data - orig_data) != len + header_len) || data >= end)
        warn (_("DW_LNE_define_file: Bad opcode length\n"));
      break;

    case DW_LNE_set_discriminator:
      READ_ULEB (val, data, end);
      printf (_("set Discriminator to %" PRIu64 "\n"), val);
      break;

    /* HP extensions.  */
    case DW_LNE_HP_negate_is_UV_update:
      printf ("DW_LNE_HP_negate_is_UV_update\n");
      break;
    case DW_LNE_HP_push_context:
      printf ("DW_LNE_HP_push_context\n");
      break;
    case DW_LNE_HP_pop_context:
      printf ("DW_LNE_HP_pop_context\n");
      break;
    case DW_LNE_HP_set_file_line_column:
      printf ("DW_LNE_HP_set_file_line_column\n");
      break;
    case DW_LNE_HP_set_routine_name:
      printf ("DW_LNE_HP_set_routine_name\n");
      break;
    case DW_LNE_HP_set_sequence:
      printf ("DW_LNE_HP_set_sequence\n");
      break;
    case DW_LNE_HP_negate_post_semantics:
      printf ("DW_LNE_HP_negate_post_semantics\n");
      break;
    case DW_LNE_HP_negate_function_exit:
      printf ("DW_LNE_HP_negate_function_exit\n");
      break;
    case DW_LNE_HP_negate_front_end_logical:
      printf ("DW_LNE_HP_negate_front_end_logical\n");
      break;
    case DW_LNE_HP_define_proc:
      printf ("DW_LNE_HP_define_proc\n");
      break;
    case DW_LNE_HP_source_file_correlation:
      {
        unsigned char *edata = data + len - 1;

        printf ("DW_LNE_HP_source_file_correlation\n");

        while (data < edata)
          {
            unsigned int opc;

            READ_ULEB (opc, data, edata);

            switch (opc)
              {
              case DW_LNE_HP_SFC_formfeed:
                printf ("    DW_LNE_HP_SFC_formfeed\n");
                break;
              case DW_LNE_HP_SFC_set_listing_line:
                READ_ULEB (val, data, edata);
                printf ("    DW_LNE_HP_SFC_set_listing_line (%" PRIu64 ")\n",
                        val);
                break;
              case DW_LNE_HP_SFC_associate:
                printf ("    DW_LNE_HP_SFC_associate ");
                READ_ULEB (val, data, edata);
                printf ("(%" PRIu64 , val);
                READ_ULEB (val, data, edata);
                printf (",%" PRIu64, val);
                READ_ULEB (val, data, edata);
                printf (",%" PRIu64 ")\n", val);
                break;
              default:
                printf (_("    UNKNOWN DW_LNE_HP_SFC opcode (%u)\n"), opc);
                data = edata;
                break;
              }
          }
      }
      break;

    default:
      {
        unsigned int rlen = len - 1;

        if (op_code >= DW_LNE_lo_user
            /* The test against DW_LNW_hi_user is redundant due to
               the limited range of the unsigned char data type used
               for op_code.  */
            /*&& op_code <= DW_LNE_hi_user*/)
          printf (_("user defined: "));
        else
          printf (_("UNKNOWN: "));
        printf (_("length %d ["), rlen);
        for (; rlen; rlen--)
          printf (" %02x", *data++);
        printf ("]\n");
      }
      break;
    }

  return len + header_len;
}

static const unsigned char *
fetch_indirect_string (uint64_t offset)
{
  struct dwarf_section *section = &debug_displays [str].section;
  const unsigned char * ret;

  if (section->start == NULL)
    return (const unsigned char *) _("<no .debug_str section>");

  if (offset >= section->size)
    {
      warn (_("DW_FORM_strp offset too big: %#" PRIx64 "\n"), offset);
      return (const unsigned char *) _("<offset is too big>");
    }

  ret = section->start + offset;
  /* Unfortunately we cannot rely upon the .debug_str section ending with a
     NUL byte.  Since our caller is expecting to receive a well formed C
     string we test for the lack of a terminating byte here.  */
  if (strnlen ((const char *) ret, section->size - offset)
      == section->size - offset)
    ret = (const unsigned char *)
      _("<no NUL byte at end of .debug_str section>");

  return ret;
}

static const unsigned char *
fetch_indirect_line_string (uint64_t offset)
{
  struct dwarf_section *section = &debug_displays [line_str].section;
  const unsigned char * ret;

  if (section->start == NULL)
    return (const unsigned char *) _("<no .debug_line_str section>");

  if (offset >= section->size)
    {
      warn (_("DW_FORM_line_strp offset too big: %#" PRIx64 "\n"), offset);
      return (const unsigned char *) _("<offset is too big>");
    }

  ret = section->start + offset;
  /* Unfortunately we cannot rely upon the .debug_line_str section ending
     with a NUL byte.  Since our caller is expecting to receive a well formed
     C string we test for the lack of a terminating byte here.  */
  if (strnlen ((const char *) ret, section->size - offset)
      == section->size - offset)
    ret = (const unsigned char *)
      _("<no NUL byte at end of .debug_line_str section>");

  return ret;
}

static const char *
fetch_indexed_string (uint64_t idx,
                      struct cu_tu_set *this_set,
                      uint64_t offset_size,
                      bool dwo,
                      uint64_t str_offsets_base)
{
  enum dwarf_section_display_enum str_sec_idx = dwo ? str_dwo : str;
  enum dwarf_section_display_enum idx_sec_idx = dwo ? str_index_dwo : str_index;
  struct dwarf_section *index_section = &debug_displays [idx_sec_idx].section;
  struct dwarf_section *str_section = &debug_displays [str_sec_idx].section;
  uint64_t index_offset;
  uint64_t str_offset;
  const char * ret;

  if (index_section->start == NULL)
    return (dwo ? _("<no .debug_str_offsets.dwo section>")
                : _("<no .debug_str_offsets section>"));

  if (str_section->start == NULL)
    return (dwo ? _("<no .debug_str.dwo section>")
                : _("<no .debug_str section>"));

  index_offset = idx * offset_size;

  if (this_set != NULL)
    index_offset += this_set->section_offsets [DW_SECT_STR_OFFSETS];

  index_offset += str_offsets_base;

  if (index_offset + offset_size > index_section->size)
    {
      warn (_("string index of %" PRIu64 " converts to an offset of %#" PRIx64
              " which is too big for section %s"),
            idx, index_offset, str_section->name);

      return _("<string index too big>");
    }

  /* FIXME: If we are being paranoid then we should also check to see if
     IDX references an entry beyond the end of the string table pointed to
     by STR_OFFSETS_BASE.  (Since there can be more than one string table
     in a DWARF string section).  */

  str_offset = byte_get (index_section->start + index_offset, offset_size);

  str_offset -= str_section->address;
  if (str_offset >= str_section->size)
    {
      warn (_("indirect offset too big: %#" PRIx64 "\n"), str_offset);
      return _("<indirect index offset is too big>");
    }

  ret = (const char *) str_section->start + str_offset;

  /* Unfortunately we cannot rely upon str_section ending with a NUL byte.
     Since our caller is expecting to receive a well formed C string we test
     for the lack of a terminating byte here.  */
  if (strnlen (ret, str_section->size - str_offset)
      == str_section->size - str_offset)
    return _("<no NUL byte at end of section>");

  return ret;
}

static uint64_t
fetch_indexed_addr (uint64_t offset, uint32_t num_bytes)
{
  struct dwarf_section *section = &debug_displays [debug_addr].section;

  if (section->start == NULL)
    {
      warn (_("Cannot fetch indexed address: the .debug_addr section is missing\n"));
      return 0;
    }

  if (offset + num_bytes > section->size)
    {
      warn (_("Offset into section %s too big: %#" PRIx64 "\n"),
            section->name, offset);
      return 0;
    }

  return byte_get (section->start + offset, num_bytes);
}

/* Fetch a value from a debug section that has been indexed by
   something in another section (eg DW_FORM_loclistx or DW_FORM_rnglistx).
   Returns -1 if the value could not be found.  */

static uint64_t
fetch_indexed_value (uint64_t idx,
                     enum dwarf_section_display_enum sec_enum,
                     uint64_t base_address)
{
  struct dwarf_section *section = &debug_displays [sec_enum].section;

  if (section->start == NULL)
    {
      warn (_("Unable to locate %s section\n"), section->uncompressed_name);
      return -1;
    }

  if (section->size < 4)
    {
      warn (_("Section %s is too small to contain an value indexed from another section!\n"),
            section->name);
      return -1;
    }

  uint32_t pointer_size, bias;

  if (byte_get (section->start, 4) == 0xffffffff)
    {
      pointer_size = 8;
      bias = 20;
    }
  else
    {
      pointer_size = 4;
      bias = 12;
    }

  uint64_t offset = idx * pointer_size;

  /* Offsets are biased by the size of the section header
     or base address.  */
  if (base_address)
    offset += base_address;
  else
    offset += bias;

  if (offset + pointer_size > section->size)
    {
      warn (_("Offset into section %s too big: %#" PRIx64 "\n"),
            section->name, offset);
      return -1;
    }

  return byte_get (section->start + offset, pointer_size);
}

/* FIXME:  There are better and more efficient ways to handle
   these structures.  For now though, I just want something that
   is simple to implement.  */
/* Records a single attribute in an abbrev.  */
typedef struct abbrev_attr
{
  unsigned long attribute;
  unsigned long form;
  int64_t implicit_const;
  struct abbrev_attr *next;
}
abbrev_attr;

/* Records a single abbrev.  */
typedef struct abbrev_entry
{
  unsigned long          number;
  unsigned long          tag;
  int                    children;
  struct abbrev_attr *   first_attr;
  struct abbrev_attr *   last_attr;
  struct abbrev_entry *  next;
}
abbrev_entry;

/* Records a set of abbreviations.  */
typedef struct abbrev_list
{
  abbrev_entry *        first_abbrev;
  abbrev_entry *        last_abbrev;
  unsigned char *       raw;
  struct abbrev_list *  next;
  unsigned char *       start_of_next_abbrevs;
}
abbrev_list;

/* Records all the abbrevs found so far.  */
static struct abbrev_list * abbrev_lists = NULL;

typedef struct abbrev_map
{
  uint64_t start;
  uint64_t end;
  abbrev_list *list;
} abbrev_map;

/* Maps between CU offsets and abbrev sets.  */
static abbrev_map *   cu_abbrev_map = NULL;
static unsigned long  num_abbrev_map_entries = 0;
static unsigned long  next_free_abbrev_map_entry = 0;

#define INITIAL_NUM_ABBREV_MAP_ENTRIES 8
#define ABBREV_MAP_ENTRIES_INCREMENT   8

static void
record_abbrev_list_for_cu (uint64_t start, uint64_t end,
                           abbrev_list *list, abbrev_list *free_list)
{
  if (free_list != NULL)
    {
      list->next = abbrev_lists;
      abbrev_lists = list;
    }

  if (cu_abbrev_map == NULL)
    {
      num_abbrev_map_entries = INITIAL_NUM_ABBREV_MAP_ENTRIES;
      cu_abbrev_map = xmalloc (num_abbrev_map_entries * sizeof (* cu_abbrev_map));
    }
  else if (next_free_abbrev_map_entry == num_abbrev_map_entries)
    {
      num_abbrev_map_entries += ABBREV_MAP_ENTRIES_INCREMENT;
      cu_abbrev_map = xrealloc (cu_abbrev_map, num_abbrev_map_entries * sizeof (* cu_abbrev_map));
    }

  cu_abbrev_map[next_free_abbrev_map_entry].start = start;
  cu_abbrev_map[next_free_abbrev_map_entry].end = end;
  cu_abbrev_map[next_free_abbrev_map_entry].list = list;
  next_free_abbrev_map_entry ++;
}

static abbrev_list *
free_abbrev_list (abbrev_list *list)
{
  abbrev_entry *abbrv = list->first_abbrev;

  while (abbrv)
    {
      abbrev_attr *attr = abbrv->first_attr;

      while (attr)
        {
          abbrev_attr *next_attr = attr->next;
          free (attr);
          attr = next_attr;
        }

      abbrev_entry *next_abbrev = abbrv->next;
      free (abbrv);
      abbrv = next_abbrev;
    }

  abbrev_list *next = list->next;
  free (list);
  return next;
}

static void
free_all_abbrevs (void)
{
  while (abbrev_lists)
    abbrev_lists = free_abbrev_list (abbrev_lists);

  free (cu_abbrev_map);
  cu_abbrev_map = NULL;
  next_free_abbrev_map_entry = 0;
}

static abbrev_list *
find_abbrev_list_by_raw_abbrev (unsigned char *raw)
{
  abbrev_list * list;

  for (list = abbrev_lists; list != NULL; list = list->next)
    if (list->raw == raw)
      return list;

  return NULL;
}

/* Find the abbreviation map for the CU that includes OFFSET.
   OFFSET is an absolute offset from the start of the .debug_info section.  */
/* FIXME: This function is going to slow down readelf & objdump.
   Not caching abbrevs is likely the answer.  */

static  abbrev_map *
find_abbrev_map_by_offset (uint64_t offset)
{
  unsigned long i;

  for (i = 0; i < next_free_abbrev_map_entry; i++)
    if (cu_abbrev_map[i].start <= offset
        && cu_abbrev_map[i].end > offset)
      return cu_abbrev_map + i;

  return NULL;
}

static void
add_abbrev (unsigned long  number,
            unsigned long  tag,
            int            children,
            abbrev_list *  list)
{
  abbrev_entry *  entry;

  entry = (abbrev_entry *) xmalloc (sizeof (*entry));

  entry->number     = number;
  entry->tag        = tag;
  entry->children   = children;
  entry->first_attr = NULL;
  entry->last_attr  = NULL;
  entry->next       = NULL;

  assert (list != NULL);

  if (list->first_abbrev == NULL)
    list->first_abbrev = entry;
  else
    list->last_abbrev->next = entry;

  list->last_abbrev = entry;
}

static void
add_abbrev_attr (unsigned long attribute,
                 unsigned long form,
                 int64_t implicit_const,
                 abbrev_list *list)
{
  abbrev_attr *attr;

  attr = (abbrev_attr *) xmalloc (sizeof (*attr));

  attr->attribute      = attribute;
  attr->form           = form;
  attr->implicit_const = implicit_const;
  attr->next           = NULL;

  assert (list != NULL && list->last_abbrev != NULL);

  if (list->last_abbrev->first_attr == NULL)
    list->last_abbrev->first_attr = attr;
  else
    list->last_abbrev->last_attr->next = attr;

  list->last_abbrev->last_attr = attr;
}

/* Return processed (partial) contents of a .debug_abbrev section.
   Returns NULL on errors.  */

static abbrev_list *
process_abbrev_set (struct dwarf_section *section,
                    unsigned char *start,
                    unsigned char *end)
{
  abbrev_list *list = xmalloc (sizeof (*list));
  list->first_abbrev = NULL;
  list->last_abbrev = NULL;
  list->raw = start;

  while (start < end)
    {
      unsigned long entry;
      unsigned long tag;
      unsigned long attribute;
      int children;

      READ_ULEB (entry, start, end);

      /* A single zero is supposed to end the set according
         to the standard.  If there's more, then signal that to
         the caller.  */
      if (start == end || entry == 0)
        {
          list->next = NULL;
          list->start_of_next_abbrevs = start != end ? start : NULL;
          return list;
        }

      READ_ULEB (tag, start, end);
      if (start == end)
        {
          free (list);
          return NULL;
        }

      children = *start++;

      add_abbrev (entry, tag, children, list);

      do
        {
          unsigned long form;
          /* Initialize it due to a false compiler warning.  */
          int64_t implicit_const = -1;

          READ_ULEB (attribute, start, end);
          if (start == end)
            break;

          READ_ULEB (form, start, end);
          if (start == end)
            break;

          if (form == DW_FORM_implicit_const)
            {
              READ_SLEB (implicit_const, start, end);
              if (start == end)
                break;
            }

          add_abbrev_attr (attribute, form, implicit_const, list);
        }
      while (attribute != 0);
    }

  /* Report the missing single zero which ends the section.  */
  error (_("%s section not zero terminated\n"), section->name);

  free (list);
  return NULL;
}

/* Return a sequence of abbrevs in SECTION starting at ABBREV_BASE
   plus ABBREV_OFFSET and finishing at ABBREV_BASE + ABBREV_SIZE.
   If FREE_LIST is non-NULL search the already decoded abbrevs on
   abbrev_lists first and if found set *FREE_LIST to NULL.  If
   searching doesn't find a matching abbrev, set *FREE_LIST to the
   newly allocated list.  If FREE_LIST is NULL, no search is done and
   the returned abbrev_list is always newly allocated.  */

static abbrev_list *
find_and_process_abbrev_set (struct dwarf_section *section,
                             uint64_t abbrev_base,
                             uint64_t abbrev_size,
                             uint64_t abbrev_offset,
                             abbrev_list **free_list)
{
  if (free_list)
    *free_list = NULL;

  if (abbrev_base >= section->size
      || abbrev_size > section->size - abbrev_base)
    {
      /* PR 17531: file:4bcd9ce9.  */
      warn (_("Debug info is corrupted, abbrev size (%#" PRIx64 ")"
              " is larger than abbrev section size (%#" PRIx64 ")\n"),
              abbrev_base + abbrev_size, section->size);
      return NULL;
    }
  if (abbrev_offset >= abbrev_size)
    {
      warn (_("Debug info is corrupted, abbrev offset (%#" PRIx64 ")"
              " is larger than abbrev section size (%#" PRIx64 ")\n"),
            abbrev_offset, abbrev_size);
      return NULL;
    }

  unsigned char *start = section->start + abbrev_base + abbrev_offset;
  unsigned char *end = section->start + abbrev_base + abbrev_size;
  abbrev_list *list = NULL;
  if (free_list)
    list = find_abbrev_list_by_raw_abbrev (start);
  if (list == NULL)
    {
      list = process_abbrev_set (section, start, end);
      if (free_list)
        *free_list = list;
    }
  return list;
}

static const char *
get_TAG_name (uint64_t tag)
{
  const char *name = NULL;

  if ((unsigned int) tag == tag)
    name = get_DW_TAG_name ((unsigned int) tag);
  if (name == NULL)
    {
      static char buffer[100];

      if (tag >= DW_TAG_lo_user && tag <= DW_TAG_hi_user)
        snprintf (buffer, sizeof (buffer),
                  _("User TAG value: %#" PRIx64), tag);
      else
        snprintf (buffer, sizeof (buffer),
                  _("Unknown TAG value: %#" PRIx64), tag);
      return buffer;
    }

  return name;
}

static const char *
get_FORM_name (unsigned long form)
{
  const char *name = NULL;

  if (form == 0)
    return "DW_FORM value: 0";

  if ((unsigned int) form == form)
    name = get_DW_FORM_name ((unsigned int) form);
  if (name == NULL)
    {
      static char buffer[100];

      snprintf (buffer, sizeof (buffer), _("Unknown FORM value: %lx"), form);
      return buffer;
    }

  return name;
}

static const char *
get_IDX_name (unsigned long idx)
{
  const char *name = NULL;

  if ((unsigned int) idx == idx)
    name = get_DW_IDX_name ((unsigned int) idx);
  if (name == NULL)
    {
      static char buffer[100];

      snprintf (buffer, sizeof (buffer), _("Unknown IDX value: %lx"), idx);
      return buffer;
    }

  return name;
}

static unsigned char *
display_block (unsigned char *data,
               uint64_t length,
               const unsigned char * const end, char delimiter)
{
  size_t maxlen;

  printf (_("%c%" PRIu64 " byte block: "), delimiter, length);
  if (data > end)
    return (unsigned char *) end;

  maxlen = end - data;
  length = length > maxlen ? maxlen : length;

  while (length --)
    printf ("%" PRIx64 " ", byte_get (data++, 1));

  return data;
}

static int
decode_location_expression (unsigned char * data,
                            unsigned int pointer_size,
                            unsigned int offset_size,
                            int dwarf_version,
                            uint64_t length,
                            uint64_t cu_offset,
                            struct dwarf_section * section)
{
  unsigned op;
  uint64_t uvalue;
  int64_t svalue;
  unsigned char *end = data + length;
  int need_frame_base = 0;

  while (data < end)
    {
      op = *data++;

      switch (op)
        {
        case DW_OP_addr:
          SAFE_BYTE_GET_AND_INC (uvalue, data, pointer_size, end);
          printf ("DW_OP_addr: %" PRIx64, uvalue);
          break;
        case DW_OP_deref:
          printf ("DW_OP_deref");
          break;
        case DW_OP_const1u:
          SAFE_BYTE_GET_AND_INC (uvalue, data, 1, end);
          printf ("DW_OP_const1u: %" PRIu64, uvalue);
          break;
        case DW_OP_const1s:
          SAFE_SIGNED_BYTE_GET_AND_INC (svalue, data, 1, end);
          printf ("DW_OP_const1s: %" PRId64, svalue);
          break;
        case DW_OP_const2u:
          SAFE_BYTE_GET_AND_INC (uvalue, data, 2, end);
          printf ("DW_OP_const2u: %" PRIu64, uvalue);
          break;
        case DW_OP_const2s:
          SAFE_SIGNED_BYTE_GET_AND_INC (svalue, data, 2, end);
          printf ("DW_OP_const2s: %" PRId64, svalue);
          break;
        case DW_OP_const4u:
          SAFE_BYTE_GET_AND_INC (uvalue, data, 4, end);
          printf ("DW_OP_const4u: %" PRIu64, uvalue);
          break;
        case DW_OP_const4s:
          SAFE_SIGNED_BYTE_GET_AND_INC (svalue, data, 4, end);
          printf ("DW_OP_const4s: %" PRId64, svalue);
          break;
        case DW_OP_const8u:
          SAFE_BYTE_GET_AND_INC (uvalue, data, 8, end);
          printf ("DW_OP_const8u: %" PRIu64, uvalue);
          break;
        case DW_OP_const8s:
          SAFE_SIGNED_BYTE_GET_AND_INC (svalue, data, 8, end);
          printf ("DW_OP_const8s: %" PRId64, svalue);
          break;
        case DW_OP_constu:
          READ_ULEB (uvalue, data, end);
          printf ("DW_OP_constu: %" PRIu64, uvalue);
          break;
        case DW_OP_consts:
          READ_SLEB (svalue, data, end);
          printf ("DW_OP_consts: %" PRId64, svalue);
          break;
        case DW_OP_dup:
          printf ("DW_OP_dup");
          break;
        case DW_OP_drop:
          printf ("DW_OP_drop");
          break;
        case DW_OP_over:
          printf ("DW_OP_over");
          break;
        case DW_OP_pick:
          SAFE_BYTE_GET_AND_INC (uvalue, data, 1, end);
          printf ("DW_OP_pick: %" PRIu64, uvalue);
          break;
        case DW_OP_swap:
          printf ("DW_OP_swap");
          break;
        case DW_OP_rot:
          printf ("DW_OP_rot");
          break;
        case DW_OP_xderef:
          printf ("DW_OP_xderef");
          break;
        case DW_OP_abs:
          printf ("DW_OP_abs");
          break;
        case DW_OP_and:
          printf ("DW_OP_and");
          break;
        case DW_OP_div:
          printf ("DW_OP_div");
          break;
        case DW_OP_minus:
          printf ("DW_OP_minus");
          break;
        case DW_OP_mod:
          printf ("DW_OP_mod");
          break;
        case DW_OP_mul:
          printf ("DW_OP_mul");
          break;
        case DW_OP_neg:
          printf ("DW_OP_neg");
          break;
        case DW_OP_not:
          printf ("DW_OP_not");
          break;
        case DW_OP_or:
          printf ("DW_OP_or");
          break;
        case DW_OP_plus:
          printf ("DW_OP_plus");
          break;
        case DW_OP_plus_uconst:
          READ_ULEB (uvalue, data, end);
          printf ("DW_OP_plus_uconst: %" PRIu64, uvalue);
          break;
        case DW_OP_shl:
          printf ("DW_OP_shl");
          break;
        case DW_OP_shr:
          printf ("DW_OP_shr");
          break;
        case DW_OP_shra:
          printf ("DW_OP_shra");
          break;
        case DW_OP_xor:
          printf ("DW_OP_xor");
          break;
        case DW_OP_bra:
          SAFE_SIGNED_BYTE_GET_AND_INC (svalue, data, 2, end);
          printf ("DW_OP_bra: %" PRId64, svalue);
          break;
        case DW_OP_eq:
          printf ("DW_OP_eq");
          break;
        case DW_OP_ge:
          printf ("DW_OP_ge");
          break;
        case DW_OP_gt:
          printf ("DW_OP_gt");
          break;
        case DW_OP_le:
          printf ("DW_OP_le");
          break;
        case DW_OP_lt:
          printf ("DW_OP_lt");
          break;
        case DW_OP_ne:
          printf ("DW_OP_ne");
          break;
        case DW_OP_skip:
          SAFE_SIGNED_BYTE_GET_AND_INC (svalue, data, 2, end);
          printf ("DW_OP_skip: %" PRId64, svalue);
          break;

        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:
          printf ("DW_OP_lit%d", 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:
          printf ("DW_OP_reg%d (%s)", op - DW_OP_reg0,
                  regname (op - DW_OP_reg0, 1));
          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:
          READ_SLEB (svalue, data, end);
          printf ("DW_OP_breg%d (%s): %" PRId64,
                  op - DW_OP_breg0, regname (op - DW_OP_breg0, 1), svalue);
          break;

        case DW_OP_regx:
          READ_ULEB (uvalue, data, end);
          printf ("DW_OP_regx: %" PRIu64 " (%s)",
                  uvalue, regname (uvalue, 1));
          break;
        case DW_OP_fbreg:
          need_frame_base = 1;
          READ_SLEB (svalue, data, end);
          printf ("DW_OP_fbreg: %" PRId64, svalue);
          break;
        case DW_OP_bregx:
          READ_ULEB (uvalue, data, end);
          READ_SLEB (svalue, data, end);
          printf ("DW_OP_bregx: %" PRIu64 " (%s) %" PRId64,
                  uvalue, regname (uvalue, 1), svalue);
          break;
        case DW_OP_piece:
          READ_ULEB (uvalue, data, end);
          printf ("DW_OP_piece: %" PRIu64, uvalue);
          break;
        case DW_OP_deref_size:
          SAFE_BYTE_GET_AND_INC (uvalue, data, 1, end);
          printf ("DW_OP_deref_size: %" PRIu64, uvalue);
          break;
        case DW_OP_xderef_size:
          SAFE_BYTE_GET_AND_INC (uvalue, data, 1, end);
          printf ("DW_OP_xderef_size: %" PRIu64, uvalue);
          break;
        case DW_OP_nop:
          printf ("DW_OP_nop");
          break;

          /* DWARF 3 extensions.  */
        case DW_OP_push_object_address:
          printf ("DW_OP_push_object_address");
          break;
        case DW_OP_call2:
          /* FIXME: Strictly speaking for 64-bit DWARF3 files
             this ought to be an 8-byte wide computation.  */
          SAFE_SIGNED_BYTE_GET_AND_INC (svalue, data, 2, end);
          printf ("DW_OP_call2: <%#" PRIx64 ">", svalue + cu_offset);
          break;
        case DW_OP_call4:
          /* FIXME: Strictly speaking for 64-bit DWARF3 files
             this ought to be an 8-byte wide computation.  */
          SAFE_SIGNED_BYTE_GET_AND_INC (svalue, data, 4, end);
          printf ("DW_OP_call4: <%#" PRIx64 ">", svalue + cu_offset);
          break;
        case DW_OP_call_ref:
          /* FIXME: Strictly speaking for 64-bit DWARF3 files
             this ought to be an 8-byte wide computation.  */
          if (dwarf_version == -1)
            {
              printf (_("(DW_OP_call_ref in frame info)"));
              /* No way to tell where the next op is, so just bail.  */
              return need_frame_base;
            }
          if (dwarf_version == 2)
            {
              SAFE_BYTE_GET_AND_INC (uvalue, data, pointer_size, end);
            }
          else
            {
              SAFE_BYTE_GET_AND_INC (uvalue, data, offset_size, end);
            }
          printf ("DW_OP_call_ref: <%#" PRIx64 ">", uvalue);
          break;
        case DW_OP_form_tls_address:
          printf ("DW_OP_form_tls_address");
          break;
        case DW_OP_call_frame_cfa:
          printf ("DW_OP_call_frame_cfa");
          break;
        case DW_OP_bit_piece:
          printf ("DW_OP_bit_piece: ");
          READ_ULEB (uvalue, data, end);
          printf (_("size: %" PRIu64 " "), uvalue);
          READ_ULEB (uvalue, data, end);
          printf (_("offset: %" PRIu64 " "), uvalue);
          break;

          /* DWARF 4 extensions.  */
        case DW_OP_stack_value:
          printf ("DW_OP_stack_value");
          break;

        case DW_OP_implicit_value:
          printf ("DW_OP_implicit_value");
          READ_ULEB (uvalue, data, end);
          data = display_block (data, uvalue, end, ' ');
          break;

          /* GNU extensions.  */
        case DW_OP_GNU_push_tls_address:
          printf (_("DW_OP_GNU_push_tls_address or DW_OP_HP_unknown"));
          break;
        case DW_OP_GNU_uninit:
          printf ("DW_OP_GNU_uninit");
          /* FIXME: Is there data associated with this OP ?  */
          break;
        case DW_OP_GNU_encoded_addr:
          {
            int encoding = 0;
            uint64_t addr;

            if (data < end)
              encoding = *data++;
            addr = get_encoded_value (&data, encoding, section, end);

            printf ("DW_OP_GNU_encoded_addr: fmt:%02x addr:", encoding);
            print_hex_ns (addr, pointer_size);
          }
          break;
        case DW_OP_implicit_pointer:
        case DW_OP_GNU_implicit_pointer:
          /* FIXME: Strictly speaking for 64-bit DWARF3 files
             this ought to be an 8-byte wide computation.  */
          if (dwarf_version == -1)
            {
              printf (_("(%s in frame info)"),
                      (op == DW_OP_implicit_pointer
                       ? "DW_OP_implicit_pointer"
                       : "DW_OP_GNU_implicit_pointer"));
              /* No way to tell where the next op is, so just bail.  */
              return need_frame_base;
            }
          if (dwarf_version == 2)
            {
              SAFE_BYTE_GET_AND_INC (uvalue, data, pointer_size, end);
            }
          else
            {
              SAFE_BYTE_GET_AND_INC (uvalue, data, offset_size, end);
            }
          READ_SLEB (svalue, data, end);
          printf ("%s: <%#" PRIx64 "> %" PRId64,
                  (op == DW_OP_implicit_pointer
                   ? "DW_OP_implicit_pointer" : "DW_OP_GNU_implicit_pointer"),
                  uvalue, svalue);
          break;
        case DW_OP_entry_value:
        case DW_OP_GNU_entry_value:
          READ_ULEB (uvalue, data, end);
          /* PR 17531: file: 0cc9cd00.  */
          if (uvalue > (size_t) (end - data))
            uvalue = end - data;
          printf ("%s: (", (op == DW_OP_entry_value ? "DW_OP_entry_value"
                                                    : "DW_OP_GNU_entry_value"));
          if (decode_location_expression (data, pointer_size, offset_size,
                                          dwarf_version, uvalue,
                                          cu_offset, section))
            need_frame_base = 1;
          putchar (')');
          data += uvalue;
          break;
        case DW_OP_const_type:
        case DW_OP_GNU_const_type:
          READ_ULEB (uvalue, data, end);
          printf ("%s: <%#" PRIx64 "> ",
                  (op == DW_OP_const_type ? "DW_OP_const_type"
                                          : "DW_OP_GNU_const_type"),
                  cu_offset + uvalue);
          SAFE_BYTE_GET_AND_INC (uvalue, data, 1, end);
          data = display_block (data, uvalue, end, ' ');
          break;
        case DW_OP_regval_type:
        case DW_OP_GNU_regval_type:
          READ_ULEB (uvalue, data, end);
          printf ("%s: %" PRIu64 " (%s)",
                  (op == DW_OP_regval_type ? "DW_OP_regval_type"
                                           : "DW_OP_GNU_regval_type"),
                  uvalue, regname (uvalue, 1));
          READ_ULEB (uvalue, data, end);
          printf (" <%#" PRIx64 ">", cu_offset + uvalue);
          break;
        case DW_OP_deref_type:
        case DW_OP_GNU_deref_type:
          SAFE_BYTE_GET_AND_INC (uvalue, data, 1, end);
          printf ("%s: %" PRId64,
                  (op == DW_OP_deref_type ? "DW_OP_deref_type"
                                          : "DW_OP_GNU_deref_type"),
                  uvalue);
          READ_ULEB (uvalue, data, end);
          printf (" <%#" PRIx64 ">", cu_offset + uvalue);
          break;
        case DW_OP_convert:
        case DW_OP_GNU_convert:
          READ_ULEB (uvalue, data, end);
          printf ("%s <%#" PRIx64 ">",
                  (op == DW_OP_convert ? "DW_OP_convert" : "DW_OP_GNU_convert"),
                  uvalue ? cu_offset + uvalue : uvalue);
          break;
        case DW_OP_reinterpret:
        case DW_OP_GNU_reinterpret:
          READ_ULEB (uvalue, data, end);
          printf ("%s <%#" PRIx64 ">",
                  (op == DW_OP_reinterpret ? "DW_OP_reinterpret"
                                           : "DW_OP_GNU_reinterpret"),
                  uvalue ? cu_offset + uvalue : uvalue);
          break;
        case DW_OP_GNU_parameter_ref:
          SAFE_BYTE_GET_AND_INC (uvalue, data, 4, end);
          printf ("DW_OP_GNU_parameter_ref: <%#" PRIx64 ">",
                  cu_offset + uvalue);
          break;
        case DW_OP_addrx:
          READ_ULEB (uvalue, data, end);
          printf ("DW_OP_addrx <%#" PRIx64 ">", uvalue);
          break;
        case DW_OP_GNU_addr_index:
          READ_ULEB (uvalue, data, end);
          printf ("DW_OP_GNU_addr_index <%#" PRIx64 ">", uvalue);
          break;
        case DW_OP_GNU_const_index:
          READ_ULEB (uvalue, data, end);
          printf ("DW_OP_GNU_const_index <%#" PRIx64 ">", uvalue);
          break;
        case DW_OP_GNU_variable_value:
          /* FIXME: Strictly speaking for 64-bit DWARF3 files
             this ought to be an 8-byte wide computation.  */
          if (dwarf_version == -1)
            {
              printf (_("(DW_OP_GNU_variable_value in frame info)"));
              /* No way to tell where the next op is, so just bail.  */
              return need_frame_base;
            }
          if (dwarf_version == 2)
            {
              SAFE_BYTE_GET_AND_INC (uvalue, data, pointer_size, end);
            }
          else
            {
              SAFE_BYTE_GET_AND_INC (uvalue, data, offset_size, end);
            }
          printf ("DW_OP_GNU_variable_value: <%#" PRIx64 ">", uvalue);
          break;

          /* HP extensions.  */
        case DW_OP_HP_is_value:
          printf ("DW_OP_HP_is_value");
          /* FIXME: Is there data associated with this OP ?  */
          break;
        case DW_OP_HP_fltconst4:
          printf ("DW_OP_HP_fltconst4");
          /* FIXME: Is there data associated with this OP ?  */
          break;
        case DW_OP_HP_fltconst8:
          printf ("DW_OP_HP_fltconst8");
          /* FIXME: Is there data associated with this OP ?  */
          break;
        case DW_OP_HP_mod_range:
          printf ("DW_OP_HP_mod_range");
          /* FIXME: Is there data associated with this OP ?  */
          break;
        case DW_OP_HP_unmod_range:
          printf ("DW_OP_HP_unmod_range");
          /* FIXME: Is there data associated with this OP ?  */
          break;
        case DW_OP_HP_tls:
          printf ("DW_OP_HP_tls");
          /* FIXME: Is there data associated with this OP ?  */
          break;

          /* PGI (STMicroelectronics) extensions.  */
        case DW_OP_PGI_omp_thread_num:
          /* Pushes the thread number for the current thread as it would be
             returned by the standard OpenMP library function:
             omp_get_thread_num().  The "current thread" is the thread for
             which the expression is being evaluated.  */
          printf ("DW_OP_PGI_omp_thread_num");
          break;

        default:
          if (op >= DW_OP_lo_user
              && op <= DW_OP_hi_user)
            printf (_("(User defined location op %#x)"), op);
          else
            printf (_("(Unknown location op %#x)"), op);
          /* No way to tell where the next op is, so just bail.  */
          return need_frame_base;
        }

      /* Separate the ops.  */
      if (data < end)
        printf ("; ");
    }

  return need_frame_base;
}

/* Find the CU or TU set corresponding to the given CU_OFFSET.
   This is used for DWARF package files.  */

static struct cu_tu_set *
find_cu_tu_set_v2 (uint64_t cu_offset, int do_types)
{
  struct cu_tu_set *p;
  unsigned int nsets;
  unsigned int dw_sect;

  if (do_types)
    {
      p = tu_sets;
      nsets = tu_count;
      dw_sect = DW_SECT_TYPES;
    }
  else
    {
      p = cu_sets;
      nsets = cu_count;
      dw_sect = DW_SECT_INFO;
    }
  while (nsets > 0)
    {
      if (p->section_offsets [dw_sect] == cu_offset)
        return p;
      p++;
      nsets--;
    }
  return NULL;
}

static const char *
fetch_alt_indirect_string (uint64_t offset)
{
  separate_info * i;

  if (! do_follow_links)
    return "";

  if (first_separate_info == NULL)
    return _("<no links available>");

  for (i = first_separate_info; i != NULL; i = i->next)
    {
      struct dwarf_section * section;
      const char *           ret;

      if (! load_debug_section (separate_debug_str, i->handle))
        continue;

      section = &debug_displays [separate_debug_str].section;

      if (section->start == NULL)
        continue;

      if (offset >= section->size)
        continue;

      ret = (const char *) (section->start + offset);
      /* Unfortunately we cannot rely upon the .debug_str section ending with a
         NUL byte.  Since our caller is expecting to receive a well formed C
         string we test for the lack of a terminating byte here.  */
      if (strnlen ((const char *) ret, section->size - offset)
          == section->size - offset)
        return _("<no NUL byte at end of alt .debug_str section>");

      return ret;
    }

  warn (_("DW_FORM_GNU_strp_alt offset (%#" PRIx64 ")"
          " too big or no string sections available\n"), offset);
  return _("<offset is too big>");
}

static const char *
get_AT_name (unsigned long attribute)
{
  const char *name;

  if (attribute == 0)
    return "DW_AT value: 0";

  /* One value is shared by the MIPS and HP extensions:  */
  if (attribute == DW_AT_MIPS_fde)
    return "DW_AT_MIPS_fde or DW_AT_HP_unmodifiable";

  name = get_DW_AT_name (attribute);

  if (name == NULL)
    {
      static char buffer[100];

      snprintf (buffer, sizeof (buffer), _("Unknown AT value: %lx"),
                attribute);
      return buffer;
    }

  return name;
}

static void
add_dwo_info (const char * value, uint64_t cu_offset, dwo_type type)
{
  dwo_info * dwinfo = xmalloc (sizeof * dwinfo);

  dwinfo->type   = type;
  dwinfo->value  = value;
  dwinfo->cu_offset = cu_offset;
  dwinfo->next   = first_dwo_info;
  first_dwo_info = dwinfo;
}

static void
add_dwo_name (const char * name, uint64_t cu_offset)
{
  add_dwo_info (name, cu_offset, DWO_NAME);
}

static void
add_dwo_dir (const char * dir, uint64_t cu_offset)
{
  add_dwo_info (dir, cu_offset, DWO_DIR);
}

static void
add_dwo_id (const char * id, uint64_t cu_offset)
{
  add_dwo_info (id, cu_offset, DWO_ID);
}

static void
free_dwo_info (void)
{
  dwo_info * dwinfo;
  dwo_info * next;

  for (dwinfo = first_dwo_info; dwinfo != NULL; dwinfo = next)
    {
      next = dwinfo->next;
      free (dwinfo);
    }
  first_dwo_info = NULL;
}

/* Ensure that START + UVALUE is less than END.
   Return an adjusted UVALUE if necessary to ensure this relationship.  */

static inline uint64_t
check_uvalue (const unsigned char *start,
              uint64_t uvalue,
              const unsigned char *end)
{
  uint64_t max_uvalue = end - start;

  /* See PR 17512: file: 008-103549-0.001:0.1.
     and PR 24829 for examples of where these tests are triggered.  */
  if (uvalue > max_uvalue)
    {
      warn (_("Corrupt attribute block length: %#" PRIx64 "\n"), uvalue);
      uvalue = max_uvalue;
    }

  return uvalue;
}

static unsigned char *
skip_attr_bytes (unsigned long form,
                 unsigned char *data,
                 unsigned char *end,
                 uint64_t pointer_size,
                 uint64_t offset_size,
                 int dwarf_version,
                 uint64_t *value_return)
{
  int64_t svalue;
  uint64_t uvalue = 0;
  uint64_t inc = 0;

  * value_return = 0;

  switch (form)
    {
    case DW_FORM_ref_addr:
      if (dwarf_version == 2)
        SAFE_BYTE_GET_AND_INC (uvalue, data, pointer_size, end);
      else if (dwarf_version > 2)
        SAFE_BYTE_GET_AND_INC (uvalue, data, offset_size, end);
      else
        return NULL;
      break;

    case DW_FORM_addr:
      SAFE_BYTE_GET_AND_INC (uvalue, data, pointer_size, end);
      break;

    case DW_FORM_strp:
    case DW_FORM_line_strp:
    case DW_FORM_sec_offset:
    case DW_FORM_GNU_ref_alt:
    case DW_FORM_GNU_strp_alt:
      SAFE_BYTE_GET_AND_INC (uvalue, data, offset_size, end);
      break;

    case DW_FORM_flag_present:
      uvalue = 1;
      break;

    case DW_FORM_ref1:
    case DW_FORM_flag:
    case DW_FORM_data1:
    case DW_FORM_strx1:
    case DW_FORM_addrx1:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 1, end);
      break;

    case DW_FORM_strx3:
    case DW_FORM_addrx3:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 3, end);
      break;

    case DW_FORM_ref2:
    case DW_FORM_data2:
    case DW_FORM_strx2:
    case DW_FORM_addrx2:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 2, end);
      break;

    case DW_FORM_ref4:
    case DW_FORM_data4:
    case DW_FORM_strx4:
    case DW_FORM_addrx4:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 4, end);
      break;

    case DW_FORM_sdata:
      READ_SLEB (svalue, data, end);
      uvalue = svalue;
      break;

    case DW_FORM_ref_udata:
    case DW_FORM_udata:
    case DW_FORM_GNU_str_index:
    case DW_FORM_strx:
    case DW_FORM_GNU_addr_index:
    case DW_FORM_addrx:
    case DW_FORM_loclistx:
    case DW_FORM_rnglistx:
      READ_ULEB (uvalue, data, end);
      break;

    case DW_FORM_ref8:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 8, end);
      break;

    case DW_FORM_data8:
    case DW_FORM_ref_sig8:
      inc = 8;
      break;

    case DW_FORM_data16:
      inc = 16;
      break;

    case DW_FORM_string:
      inc = strnlen ((char *) data, end - data) + 1;
      break;

    case DW_FORM_block:
    case DW_FORM_exprloc:
      READ_ULEB (uvalue, data, end);
      inc = uvalue;
      break;

    case DW_FORM_block1:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 1, end);
      inc = uvalue;
      break;

    case DW_FORM_block2:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 2, end);
      inc = uvalue;
      break;

    case DW_FORM_block4:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 4, end);
      inc = uvalue;
      break;

    case DW_FORM_indirect:
      READ_ULEB (form, data, end);
      if (form == DW_FORM_implicit_const)
        SKIP_ULEB (data, end);
      return skip_attr_bytes (form, data, end, pointer_size, offset_size,
                              dwarf_version, value_return);

    default:
      return NULL;
    }

  * value_return = uvalue;
  if (inc <= (size_t) (end - data))
    data += inc;
  else
    data = end;
  return data;
}

/* Given form FORM with value UVALUE, locate and return the abbreviation
   associated with it.  */

static abbrev_entry *
get_type_abbrev_from_form (unsigned long form,
                           unsigned long uvalue,
                           uint64_t cu_offset,
                           unsigned char *cu_end,
                           const struct dwarf_section *section,
                           unsigned long *abbrev_num_return,
                           unsigned char **data_return,
                           abbrev_map **map_return)
{
  unsigned long   abbrev_number;
  abbrev_map *    map;
  abbrev_entry *  entry;
  unsigned char * data;

  if (abbrev_num_return != NULL)
    * abbrev_num_return = 0;
  if (data_return != NULL)
    * data_return = NULL;

  switch (form)
    {
    case DW_FORM_GNU_ref_alt:
    case DW_FORM_ref_sig8:
      /* FIXME: We are unable to handle this form at the moment.  */
      return NULL;

    case DW_FORM_ref_addr:
      if (uvalue >= section->size)
        {
          warn (_("Unable to resolve ref_addr form: uvalue %lx "
                  "> section size %" PRIx64 " (%s)\n"),
                uvalue, section->size, section->name);
          return NULL;
        }
      break;

    case DW_FORM_ref_sup4:
    case DW_FORM_ref_sup8:
      break;

    case DW_FORM_ref1:
    case DW_FORM_ref2:
    case DW_FORM_ref4:
    case DW_FORM_ref8:
    case DW_FORM_ref_udata:
      if (uvalue + cu_offset < uvalue
          || uvalue + cu_offset > (size_t) (cu_end - section->start))
        {
          warn (_("Unable to resolve ref form: uvalue %lx + cu_offset %" PRIx64
                  " > CU size %tx\n"),
                uvalue, cu_offset, cu_end - section->start);
          return NULL;
        }
      uvalue += cu_offset;
      break;

      /* FIXME: Are there other DW_FORMs that can be used by types ?  */

    default:
      warn (_("Unexpected form %lx encountered whilst finding abbreviation for type\n"), form);
      return NULL;
    }

  data = (unsigned char *) section->start + uvalue;
  map = find_abbrev_map_by_offset (uvalue);

  if (map == NULL)
    {
      warn (_("Unable to find abbreviations for CU offset %#lx\n"), uvalue);
      return NULL;
    }
  if (map->list == NULL)
    {
      warn (_("Empty abbreviation list encountered for CU offset %lx\n"), uvalue);
      return NULL;
    }

  if (map_return != NULL)
    {
      if (form == DW_FORM_ref_addr)
        *map_return = map;
      else
        *map_return = NULL;
    }

  READ_ULEB (abbrev_number, data, section->start + section->size);

  for (entry = map->list->first_abbrev; entry != NULL; entry = entry->next)
    if (entry->number == abbrev_number)
      break;

  if (abbrev_num_return != NULL)
    * abbrev_num_return = abbrev_number;

  if (data_return != NULL)
    * data_return = data;

  if (entry == NULL)
    warn (_("Unable to find entry for abbreviation %lu\n"), abbrev_number);

  return entry;
}

/* Return IS_SIGNED set to TRUE if the type using abbreviation ENTRY
   can be determined to be a signed type.  The data for ENTRY can be
   found starting at DATA.  */

static void
get_type_signedness (abbrev_entry *entry,
                     const struct dwarf_section *section,
                     unsigned char *data,
                     unsigned char *end,
                     uint64_t cu_offset,
                     uint64_t pointer_size,
                     uint64_t offset_size,
                     int dwarf_version,
                     bool *is_signed,
                     unsigned int nesting)
{
  abbrev_attr *   attr;

  * is_signed = false;

#define MAX_NESTING 20
  if (nesting > MAX_NESTING)
    {
      /* FIXME: Warn - or is this expected ?
         NB/ We need to avoid infinite recursion.  */
      return;
    }

  for (attr = entry->first_attr;
       attr != NULL && attr->attribute;
       attr = attr->next)
    {
      unsigned char * orig_data = data;
      uint64_t uvalue = 0;

      data = skip_attr_bytes (attr->form, data, end, pointer_size,
                              offset_size, dwarf_version, & uvalue);
      if (data == NULL)
        return;

      switch (attr->attribute)
        {
        case DW_AT_linkage_name:
        case DW_AT_name:
          if (do_wide)
            {
              if (attr->form == DW_FORM_strp)
                printf (", %s", fetch_indirect_string (uvalue));
              else if (attr->form == DW_FORM_string)
                printf (", %.*s", (int) (end - orig_data), orig_data);
            }
          break;

        case DW_AT_type:
          /* Recurse.  */
          {
            abbrev_entry *type_abbrev;
            unsigned char *type_data;
            abbrev_map *map;

            type_abbrev = get_type_abbrev_from_form (attr->form,
                                                     uvalue,
                                                     cu_offset,
                                                     end,
                                                     section,
                                                     NULL /* abbrev num return */,
                                                     &type_data,
                                                     &map);
            if (type_abbrev == NULL)
              break;

            get_type_signedness (type_abbrev, section, type_data,
                                 map ? section->start + map->end : end,
                                 map ? map->start : cu_offset,
                                 pointer_size, offset_size, dwarf_version,
                                 is_signed, nesting + 1);
          }
          break;

        case DW_AT_encoding:
          /* Determine signness.  */
          switch (uvalue)
            {
            case DW_ATE_address:
              /* FIXME - some architectures have signed addresses.  */
            case DW_ATE_boolean:
            case DW_ATE_unsigned:
            case DW_ATE_unsigned_char:
            case DW_ATE_unsigned_fixed:
              * is_signed = false;
              break;

            default:
            case DW_ATE_complex_float:
            case DW_ATE_float:
            case DW_ATE_signed:
            case DW_ATE_signed_char:
            case DW_ATE_imaginary_float:
            case DW_ATE_decimal_float:
            case DW_ATE_signed_fixed:
              * is_signed = true;
              break;
            }
          break;
        }
    }
}

static void
read_and_print_leb128 (unsigned char *data,
                       unsigned int *bytes_read,
                       unsigned const char *end,
                       bool is_signed)
{
  int status;
  uint64_t val = read_leb128 (data, end, is_signed, bytes_read, &status);
  if (status != 0)
    report_leb_status (status);
  else if (is_signed)
    printf ("%" PRId64, val);
  else
    printf ("%" PRIu64, val);
}

static void
display_discr_list (unsigned long form,
                    uint64_t uvalue,
                    unsigned char *data,
                    int level)
{
  unsigned char *end = data;

  if (uvalue == 0)
    {
      printf ("[default]");
      return;
    }

  switch (form)
    {
    case DW_FORM_block:
    case DW_FORM_block1:
    case DW_FORM_block2:
    case DW_FORM_block4:
      /* Move data pointer back to the start of the byte array.  */
      data -= uvalue;
      break;
    default:
      printf ("<corrupt>\n");
      warn (_("corrupt discr_list - not using a block form\n"));
      return;
    }

  if (uvalue < 2)
    {
      printf ("<corrupt>\n");
      warn (_("corrupt discr_list - block not long enough\n"));
      return;
    }

  bool is_signed = (level > 0 && level <= MAX_CU_NESTING
                    ? level_type_signed [level - 1] : false);

  printf ("(");
  while (data < end)
    {
      unsigned char     discriminant;
      unsigned int      bytes_read;

      SAFE_BYTE_GET_AND_INC (discriminant, data, 1, end);

      switch (discriminant)
        {
        case DW_DSC_label:
          printf ("label ");
          read_and_print_leb128 (data, & bytes_read, end, is_signed);
          data += bytes_read;
          break;

        case DW_DSC_range:
          printf ("range ");
          read_and_print_leb128 (data, & bytes_read, end, is_signed);
          data += bytes_read;

          printf ("..");
          read_and_print_leb128 (data, & bytes_read, end, is_signed);
          data += bytes_read;
          break;

        default:
          printf ("<corrupt>\n");
          warn (_("corrupt discr_list - unrecognized discriminant byte %#x\n"),
                discriminant);
          return;
        }

      if (data < end)
        printf (", ");
    }

  if (is_signed)
    printf (")(signed)");
  else
    printf (")(unsigned)");
}

static unsigned char *
read_and_display_attr_value (unsigned long attribute,
                             unsigned long form,
                             int64_t implicit_const,
                             unsigned char *start,
                             unsigned char *data,
                             unsigned char *end,
                             uint64_t cu_offset,
                             uint64_t pointer_size,
                             uint64_t offset_size,
                             int dwarf_version,
                             debug_info *debug_info_p,
                             int do_loc,
                             struct dwarf_section *section,
                             struct cu_tu_set *this_set,
                             char delimiter,
                             int level)
{
  int64_t svalue;
  uint64_t uvalue = 0;
  uint64_t uvalue_hi = 0;
  unsigned char *block_start = NULL;
  unsigned char *orig_data = data;

  if (data > end || (data == end && form != DW_FORM_flag_present))
    {
      warn (_("Corrupt attribute\n"));
      return data;
    }

  if (do_wide && ! do_loc)
    {
      /* PR 26847: Display the name of the form.  */
      const char * name = get_FORM_name (form);

      /* For convenience we skip the DW_FORM_ prefix to the name.  */
      if (name[0] == 'D')
        name += 8; /* strlen ("DW_FORM_")  */
      printf ("%c(%s)", delimiter, name);
    }

  switch (form)
    {
    case DW_FORM_ref_addr:
      if (dwarf_version == 2)
        SAFE_BYTE_GET_AND_INC (uvalue, data, pointer_size, end);
      else if (dwarf_version > 2)
        SAFE_BYTE_GET_AND_INC (uvalue, data, offset_size, end);
      else
        error (_("Internal error: DW_FORM_ref_addr is not supported in DWARF version 1.\n"));
      break;

    case DW_FORM_addr:
      SAFE_BYTE_GET_AND_INC (uvalue, data, pointer_size, end);
      break;

    case DW_FORM_strp_sup:
    case DW_FORM_strp:
    case DW_FORM_line_strp:
    case DW_FORM_sec_offset:
    case DW_FORM_GNU_ref_alt:
    case DW_FORM_GNU_strp_alt:
      SAFE_BYTE_GET_AND_INC (uvalue, data, offset_size, end);
      break;

    case DW_FORM_flag_present:
      uvalue = 1;
      break;

    case DW_FORM_ref1:
    case DW_FORM_flag:
    case DW_FORM_data1:
    case DW_FORM_strx1:
    case DW_FORM_addrx1:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 1, end);
      break;

    case DW_FORM_ref2:
    case DW_FORM_data2:
    case DW_FORM_strx2:
    case DW_FORM_addrx2:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 2, end);
      break;

    case DW_FORM_strx3:
    case DW_FORM_addrx3:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 3, end);
      break;

    case DW_FORM_ref_sup4:
    case DW_FORM_ref4:
    case DW_FORM_data4:
    case DW_FORM_strx4:
    case DW_FORM_addrx4:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 4, end);
      break;

    case DW_FORM_ref_sup8:
    case DW_FORM_ref8:
    case DW_FORM_data8:
    case DW_FORM_ref_sig8:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 8, end);
      break;

    case DW_FORM_data16:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 8, end);
      SAFE_BYTE_GET_AND_INC (uvalue_hi, data, 8, end);
      if (byte_get != byte_get_little_endian)
        {
          uint64_t utmp = uvalue;
          uvalue = uvalue_hi;
          uvalue_hi = utmp;
        }
      break;

    case DW_FORM_sdata:
      READ_SLEB (svalue, data, end);
      uvalue = svalue;
      break;

    case DW_FORM_GNU_str_index:
    case DW_FORM_strx:
    case DW_FORM_ref_udata:
    case DW_FORM_udata:
    case DW_FORM_GNU_addr_index:
    case DW_FORM_addrx:
    case DW_FORM_loclistx:
    case DW_FORM_rnglistx:
      READ_ULEB (uvalue, data, end);
      break;

    case DW_FORM_indirect:
      READ_ULEB (form, data, end);
      if (!do_loc)
        printf ("%c%s", delimiter, get_FORM_name (form));
      if (form == DW_FORM_implicit_const)
        READ_SLEB (implicit_const, data, end);
      return read_and_display_attr_value (attribute, form, implicit_const,
                                          start, data, end,
                                          cu_offset, pointer_size,
                                          offset_size, dwarf_version,
                                          debug_info_p, do_loc,
                                          section, this_set, delimiter, level);

    case DW_FORM_implicit_const:
      uvalue = implicit_const;
      break;

    default:
      break;
    }

  switch (form)
    {
    case DW_FORM_ref_addr:
      if (!do_loc)
        printf ("%c<%#" PRIx64 ">", delimiter, uvalue);
      break;

    case DW_FORM_GNU_ref_alt:
      if (!do_loc)
        {
          if (do_wide)
            /* We have already printed the form name.  */
            printf ("%c<%#" PRIx64 ">", delimiter, uvalue);
          else
            printf ("%c<alt %#" PRIx64 ">", delimiter, uvalue);
        }
      /* FIXME: Follow the reference...  */
      break;

    case DW_FORM_ref1:
    case DW_FORM_ref2:
    case DW_FORM_ref4:
    case DW_FORM_ref_sup4:
    case DW_FORM_ref_udata:
      if (!do_loc)
        printf ("%c<%#" PRIx64 ">", delimiter, uvalue + cu_offset);
      break;

    case DW_FORM_data4:
    case DW_FORM_addr:
    case DW_FORM_sec_offset:
      if (!do_loc)
        printf ("%c%#" PRIx64, delimiter, uvalue);
      break;

    case DW_FORM_flag_present:
    case DW_FORM_flag:
    case DW_FORM_data1:
    case DW_FORM_data2:
    case DW_FORM_sdata:
      if (!do_loc)
        printf ("%c%" PRId64, delimiter, uvalue);
      break;

    case DW_FORM_udata:
      if (!do_loc)
        printf ("%c%" PRIu64, delimiter, uvalue);
      break;

    case DW_FORM_implicit_const:
      if (!do_loc)
        printf ("%c%" PRId64, delimiter, implicit_const);
      break;

    case DW_FORM_ref_sup8:
    case DW_FORM_ref8:
    case DW_FORM_data8:
      if (!do_loc)
        {
          uint64_t utmp = uvalue;
          if (form == DW_FORM_ref8)
            utmp += cu_offset;
          printf ("%c%#" PRIx64, delimiter, utmp);
        }
      break;

    case DW_FORM_data16:
      if (!do_loc)
        {
          if (uvalue_hi == 0)
            printf (" %#" PRIx64, uvalue);
          else
            printf (" %#" PRIx64 "%016" PRIx64, uvalue_hi, uvalue);
        }
      break;

    case DW_FORM_string:
      if (!do_loc)
        printf ("%c%.*s", delimiter, (int) (end - data), data);
      data += strnlen ((char *) data, end - data);
      if (data < end)
        data++;
      break;

    case DW_FORM_block:
    case DW_FORM_exprloc:
      READ_ULEB (uvalue, data, end);
    do_block:
      block_start = data;
      if (block_start >= end)
        {
          warn (_("Block ends prematurely\n"));
          uvalue = 0;
          block_start = end;
        }

      uvalue = check_uvalue (block_start, uvalue, end);

      data = block_start + uvalue;
      if (!do_loc)
        {
          unsigned char op;

          SAFE_BYTE_GET (op, block_start, sizeof (op), end);
          if (op != DW_OP_addrx)
            data = display_block (block_start, uvalue, end, delimiter);
        }
      break;

    case DW_FORM_block1:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 1, end);
      goto do_block;

    case DW_FORM_block2:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 2, end);
      goto do_block;

    case DW_FORM_block4:
      SAFE_BYTE_GET_AND_INC (uvalue, data, 4, end);
      goto do_block;

    case DW_FORM_strp:
      if (!do_loc)
        {
          if (do_wide)
            /* We have already displayed the form name.  */
            printf (_("%c(offset: %#" PRIx64 "): %s"),
                    delimiter, uvalue, fetch_indirect_string (uvalue));
          else
            printf (_("%c(indirect string, offset: %#" PRIx64 "): %s"),
                    delimiter, uvalue, fetch_indirect_string (uvalue));
        }
      break;

    case DW_FORM_line_strp:
      if (!do_loc)
        {
          if (do_wide)
            /* We have already displayed the form name.  */
            printf (_("%c(offset: %#" PRIx64 "): %s"),
                    delimiter, uvalue, fetch_indirect_line_string (uvalue));
          else
            printf (_("%c(indirect line string, offset: %#" PRIx64 "): %s"),
                    delimiter, uvalue, fetch_indirect_line_string (uvalue));
        }
      break;

    case DW_FORM_GNU_str_index:
    case DW_FORM_strx:
    case DW_FORM_strx1:
    case DW_FORM_strx2:
    case DW_FORM_strx3:
    case DW_FORM_strx4:
      if (!do_loc)
        {
          const char *suffix = section ? strrchr (section->name, '.') : NULL;
          bool dwo = suffix && strcmp (suffix, ".dwo") == 0;
          const char *strng;

          strng = fetch_indexed_string (uvalue, this_set, offset_size, dwo,
                                        debug_info_p ? debug_info_p->str_offsets_base : 0);
          if (do_wide)
            /* We have already displayed the form name.  */
            printf (_("%c(offset: %#" PRIx64 "): %s"),
                    delimiter, uvalue, strng);
          else
            printf (_("%c(indexed string: %#" PRIx64 "): %s"),
                    delimiter, uvalue, strng);
        }
      break;

    case DW_FORM_GNU_strp_alt:
      if (!do_loc)
        {
          if (do_wide)
            /* We have already displayed the form name.  */
            printf (_("%c(offset: %#" PRIx64 ") %s"),
                    delimiter, uvalue, fetch_alt_indirect_string (uvalue));
          else
            printf (_("%c(alt indirect string, offset: %#" PRIx64 ") %s"),
                    delimiter, uvalue, fetch_alt_indirect_string (uvalue));
        }
      break;

    case DW_FORM_indirect:
      /* Handled above.  */
      break;

    case DW_FORM_ref_sig8:
      if (!do_loc)
        printf ("%c%s: %#" PRIx64, delimiter, do_wide ? "" : "signature",
                uvalue);
      break;

    case DW_FORM_GNU_addr_index:
    case DW_FORM_addrx:
    case DW_FORM_addrx1:
    case DW_FORM_addrx2:
    case DW_FORM_addrx3:
    case DW_FORM_addrx4:
    case DW_FORM_loclistx:
    case DW_FORM_rnglistx:
      if (!do_loc)
        {
          uint64_t base, idx;
          const char *suffix = strrchr (section->name, '.');
          bool dwo = suffix && strcmp (suffix, ".dwo") == 0;

          if (form == DW_FORM_loclistx)
            {
              if (dwo)
                {
                  idx = fetch_indexed_value (uvalue, loclists_dwo, 0);
                  if (idx != (uint64_t) -1)
                    idx += (offset_size == 8) ? 20 : 12;
                }
              else if (debug_info_p == NULL)
                {
                  idx = fetch_indexed_value (uvalue, loclists, 0);
                }
              else
                {
                  /* We want to compute:
                       idx = fetch_indexed_value (uvalue, loclists, debug_info_p->loclists_base);
                       idx += debug_info_p->loclists_base;
                      Fortunately we already have that sum cached in the
                      loc_offsets array.  */
                  if (uvalue < debug_info_p->num_loc_offsets)
                    idx = debug_info_p->loc_offsets [uvalue];
                  else
                    {
                      warn (_("loc_offset %" PRIu64 " too big\n"), uvalue);
                      idx = -1;
                    }
                }
            }
          else if (form == DW_FORM_rnglistx)
            {
              if (dwo)
                {
                  idx = fetch_indexed_value (uvalue, rnglists_dwo, 0);
                  if (idx != (uint64_t) -1)
                    idx += (offset_size == 8) ? 20 : 12;
                }
              else
                {
                  if (debug_info_p == NULL)
                    base = 0;
                  else
                    base = debug_info_p->rnglists_base;
                  /* We do not have a cached value this time, so we perform the
                     computation manually.  */
                  idx = fetch_indexed_value (uvalue, rnglists, base);
                  if (idx != (uint64_t) -1)
                    idx += base;
                }
            }
          else
            {
              if (debug_info_p == NULL)
                base = 0;
              else if (debug_info_p->addr_base == DEBUG_INFO_UNAVAILABLE)
                base = 0;
              else
                base = debug_info_p->addr_base;

              base += uvalue * pointer_size;
              idx = fetch_indexed_addr (base, pointer_size);
            }

          /* We have already displayed the form name.  */
          if (idx != (uint64_t) -1)
            printf (_("%c(index: %#" PRIx64 "): %#" PRIx64),
                    delimiter, uvalue, idx);
        }
      break;

    case DW_FORM_strp_sup:
      if (!do_loc)
        printf ("%c<%#" PRIx64 ">", delimiter, uvalue + cu_offset);
      break;

    default:
      warn (_("Unrecognized form: %#lx\n"), form);
      /* What to do?  Consume a byte maybe?  */
      ++data;
      break;
    }

  if ((do_loc || do_debug_loc || do_debug_ranges || do_debug_info)
      && num_debug_info_entries == 0
      && debug_info_p != NULL)
    {
      switch (attribute)
        {
        case DW_AT_loclists_base:
          if (debug_info_p->loclists_base)
            warn (_("CU @ %#" PRIx64 " has multiple loclists_base values "
                    "(%#" PRIx64 " and %#" PRIx64 ")"),
                  debug_info_p->cu_offset,
                  debug_info_p->loclists_base, uvalue);
          debug_info_p->loclists_base = uvalue;
          break;
        case DW_AT_rnglists_base:
          if (debug_info_p->rnglists_base)
            warn (_("CU @ %#" PRIx64 " has multiple rnglists_base values "
                    "(%#" PRIx64 " and %#" PRIx64 ")"),
                  debug_info_p->cu_offset,
                  debug_info_p->rnglists_base, uvalue);
          debug_info_p->rnglists_base = uvalue;
          break;
        case DW_AT_str_offsets_base:
          if (debug_info_p->str_offsets_base)
            warn (_("CU @ %#" PRIx64 " has multiple str_offsets_base values "
                    "%#" PRIx64 " and %#" PRIx64 ")"),
                  debug_info_p->cu_offset,
                  debug_info_p->str_offsets_base, uvalue);
          debug_info_p->str_offsets_base = uvalue;
          break;

        case DW_AT_frame_base:
          have_frame_base = 1;
          /* Fall through.  */
        case DW_AT_location:
        case DW_AT_GNU_locviews:
        case DW_AT_string_length:
        case DW_AT_return_addr:
        case DW_AT_data_member_location:
        case DW_AT_vtable_elem_location:
        case DW_AT_segment:
        case DW_AT_static_link:
        case DW_AT_use_location:
        case DW_AT_call_value:
        case DW_AT_GNU_call_site_value:
        case DW_AT_call_data_value:
        case DW_AT_GNU_call_site_data_value:
        case DW_AT_call_target:
        case DW_AT_GNU_call_site_target:
        case DW_AT_call_target_clobbered:
        case DW_AT_GNU_call_site_target_clobbered:
          if ((dwarf_version < 4
               && (form == DW_FORM_data4 || form == DW_FORM_data8))
              || form == DW_FORM_sec_offset
              || form == DW_FORM_loclistx)
            {
              /* Process location list.  */
              unsigned int lmax = debug_info_p->max_loc_offsets;
              unsigned int num = debug_info_p->num_loc_offsets;

              if (lmax == 0 || num >= lmax)
                {
                  lmax += 1024;
                  debug_info_p->loc_offsets = (uint64_t *)
                    xcrealloc (debug_info_p->loc_offsets,
                               lmax, sizeof (*debug_info_p->loc_offsets));
                  debug_info_p->loc_views = (uint64_t *)
                    xcrealloc (debug_info_p->loc_views,
                               lmax, sizeof (*debug_info_p->loc_views));
                  debug_info_p->have_frame_base = (int *)
                    xcrealloc (debug_info_p->have_frame_base,
                               lmax, sizeof (*debug_info_p->have_frame_base));
                  debug_info_p->max_loc_offsets = lmax;
                }
              if (form == DW_FORM_loclistx)
                uvalue = fetch_indexed_value (num, loclists, debug_info_p->loclists_base);
              else if (this_set != NULL)
                uvalue += this_set->section_offsets [DW_SECT_LOC];

              debug_info_p->have_frame_base [num] = have_frame_base;
              if (attribute != DW_AT_GNU_locviews)
                {
                  uvalue += debug_info_p->loclists_base;

                  /* Corrupt DWARF info can produce more offsets than views.
                     See PR 23062 for an example.  */
                  if (debug_info_p->num_loc_offsets
                      > debug_info_p->num_loc_views)
                    warn (_("More location offset attributes than DW_AT_GNU_locview attributes\n"));
                  else
                    {
                      debug_info_p->loc_offsets [num] = uvalue;
                      debug_info_p->num_loc_offsets++;
                    }
                }
              else
                {
                  assert (debug_info_p->num_loc_views <= num);
                  num = debug_info_p->num_loc_views;
                  if (num > debug_info_p->num_loc_offsets)
                    warn (_("More DW_AT_GNU_locview attributes than location offset attributes\n"));
                  else
                    {
                      debug_info_p->loc_views [num] = uvalue;
                      debug_info_p->num_loc_views++;
                    }
                }
            }
          break;

        case DW_AT_low_pc:
          if (need_base_address)
            debug_info_p->base_address = uvalue;
          break;

        case DW_AT_GNU_addr_base:
        case DW_AT_addr_base:
          debug_info_p->addr_base = uvalue;
          break;

        case DW_AT_GNU_ranges_base:
          debug_info_p->ranges_base = uvalue;
          break;

        case DW_AT_ranges:
          if ((dwarf_version < 4
               && (form == DW_FORM_data4 || form == DW_FORM_data8))
              || form == DW_FORM_sec_offset
              || form == DW_FORM_rnglistx)
            {
              /* Process range list.  */
              unsigned int lmax = debug_info_p->max_range_lists;
              unsigned int num = debug_info_p->num_range_lists;

              if (lmax == 0 || num >= lmax)
                {
                  lmax += 1024;
                  debug_info_p->range_lists = (uint64_t *)
                    xcrealloc (debug_info_p->range_lists,
                               lmax, sizeof (*debug_info_p->range_lists));
                  debug_info_p->max_range_lists = lmax;
                }

              if (form == DW_FORM_rnglistx)
                uvalue = fetch_indexed_value (uvalue, rnglists, 0);

              debug_info_p->range_lists [num] = uvalue;
              debug_info_p->num_range_lists++;
            }
          break;

        case DW_AT_GNU_dwo_name:
        case DW_AT_dwo_name:
          if (need_dwo_info)
            switch (form)
              {
              case DW_FORM_strp:
                add_dwo_name ((const char *) fetch_indirect_string (uvalue), cu_offset);
                break;
              case DW_FORM_GNU_strp_alt:
                add_dwo_name ((const char *) fetch_alt_indirect_string (uvalue), cu_offset);
                break;
              case DW_FORM_GNU_str_index:
              case DW_FORM_strx:
              case DW_FORM_strx1:
              case DW_FORM_strx2:
              case DW_FORM_strx3:
              case DW_FORM_strx4:
                add_dwo_name (fetch_indexed_string (uvalue, this_set, offset_size, false,
                                                    debug_info_p->str_offsets_base),
                              cu_offset);
                break;
              case DW_FORM_string:
                add_dwo_name ((const char *) orig_data, cu_offset);
                break;
              default:
                warn (_("Unsupported form (%s) for attribute %s\n"),
                      get_FORM_name (form), get_AT_name (attribute));
                break;
              }
          break;

        case DW_AT_comp_dir:
          /* FIXME: Also extract a build-id in a CU/TU.  */
          if (need_dwo_info)
            switch (form)
              {
              case DW_FORM_strp:
                add_dwo_dir ((const char *) fetch_indirect_string (uvalue), cu_offset);
                break;
              case DW_FORM_GNU_strp_alt:
                add_dwo_dir (fetch_alt_indirect_string (uvalue), cu_offset);
                break;
              case DW_FORM_line_strp:
                add_dwo_dir ((const char *) fetch_indirect_line_string (uvalue), cu_offset);
                break;
              case DW_FORM_GNU_str_index:
              case DW_FORM_strx:
              case DW_FORM_strx1:
              case DW_FORM_strx2:
              case DW_FORM_strx3:
              case DW_FORM_strx4:
                add_dwo_dir (fetch_indexed_string (uvalue, this_set, offset_size, false,
                                                   debug_info_p->str_offsets_base),
                             cu_offset);
                break;
              case DW_FORM_string:
                add_dwo_dir ((const char *) orig_data, cu_offset);
                break;
              default:
                warn (_("Unsupported form (%s) for attribute %s\n"),
                      get_FORM_name (form), get_AT_name (attribute));
                break;
              }
          break;

        case DW_AT_GNU_dwo_id:
          if (need_dwo_info)
            switch (form)
              {
              case DW_FORM_data8:
                /* FIXME: Record the length of the ID as well ?  */
                add_dwo_id ((const char *) (data - 8), cu_offset);
                break;
              default:
                warn (_("Unsupported form (%s) for attribute %s\n"),
                      get_FORM_name (form), get_AT_name (attribute));
                break;
              }
          break;

        default:
          break;
        }
    }

  if (do_loc || attribute == 0)
    return data;

  /* For some attributes we can display further information.  */
  switch (attribute)
    {
    case DW_AT_type:
      if (level >= 0 && level < MAX_CU_NESTING
          && uvalue < (size_t) (end - start))
        {
          bool is_signed = false;
          abbrev_entry *type_abbrev;
          unsigned char *type_data;
          abbrev_map *map;

          type_abbrev = get_type_abbrev_from_form (form, uvalue,
                                                   cu_offset, end,
                                                   section, NULL,
                                                   &type_data, &map);
          if (type_abbrev != NULL)
            {
              get_type_signedness (type_abbrev, section, type_data,
                                   map ? section->start + map->end : end,
                                   map ? map->start : cu_offset,
                                   pointer_size, offset_size, dwarf_version,
                                   & is_signed, 0);
            }
          level_type_signed[level] = is_signed;
        }
      break;

    case DW_AT_inline:
      printf ("\t");
      switch (uvalue)
        {
        case DW_INL_not_inlined:
          printf (_("(not inlined)"));
          break;
        case DW_INL_inlined:
          printf (_("(inlined)"));
          break;
        case DW_INL_declared_not_inlined:
          printf (_("(declared as inline but ignored)"));
          break;
        case DW_INL_declared_inlined:
          printf (_("(declared as inline and inlined)"));
          break;
        default:
          printf (_("  (Unknown inline attribute value: %#" PRIx64 ")"),
                  uvalue);
          break;
        }
      break;

    case DW_AT_language:
      printf ("\t");
      switch (uvalue)
        {
          /* Ordered by the numeric value of these constants.  */
        case DW_LANG_C89:               printf ("(ANSI C)"); break;
        case DW_LANG_C:                 printf ("(non-ANSI C)"); break;
        case DW_LANG_Ada83:             printf ("(Ada)"); break;
        case DW_LANG_C_plus_plus:       printf ("(C++)"); break;
        case DW_LANG_Cobol74:           printf ("(Cobol 74)"); break;
        case DW_LANG_Cobol85:           printf ("(Cobol 85)"); break;
        case DW_LANG_Fortran77:         printf ("(FORTRAN 77)"); break;
        case DW_LANG_Fortran90:         printf ("(Fortran 90)"); break;
        case DW_LANG_Pascal83:          printf ("(ANSI Pascal)"); break;
        case DW_LANG_Modula2:           printf ("(Modula 2)"); break;
          /* DWARF 2.1 values.  */
        case DW_LANG_Java:              printf ("(Java)"); break;
        case DW_LANG_C99:               printf ("(ANSI C99)"); break;
        case DW_LANG_Ada95:             printf ("(ADA 95)"); break;
        case DW_LANG_Fortran95:         printf ("(Fortran 95)"); break;
          /* DWARF 3 values.  */
        case DW_LANG_PLI:               printf ("(PLI)"); break;
        case DW_LANG_ObjC:              printf ("(Objective C)"); break;
        case DW_LANG_ObjC_plus_plus:    printf ("(Objective C++)"); break;
        case DW_LANG_UPC:               printf ("(Unified Parallel C)"); break;
        case DW_LANG_D:                 printf ("(D)"); break;
          /* DWARF 4 values.  */
        case DW_LANG_Python:            printf ("(Python)"); break;
          /* DWARF 5 values.  */
        case DW_LANG_OpenCL:            printf ("(OpenCL)"); break;
        case DW_LANG_Go:                printf ("(Go)"); break;
        case DW_LANG_Modula3:           printf ("(Modula 3)"); break;
        case DW_LANG_Haskell:           printf ("(Haskell)"); break;
        case DW_LANG_C_plus_plus_03:    printf ("(C++03)"); break;
        case DW_LANG_C_plus_plus_11:    printf ("(C++11)"); break;
        case DW_LANG_OCaml:             printf ("(OCaml)"); break;
        case DW_LANG_Rust:              printf ("(Rust)"); break;
        case DW_LANG_C11:               printf ("(C11)"); break;
        case DW_LANG_Swift:             printf ("(Swift)"); break;
        case DW_LANG_Julia:             printf ("(Julia)"); break;
        case DW_LANG_Dylan:             printf ("(Dylan)"); break;
        case DW_LANG_C_plus_plus_14:    printf ("(C++14)"); break;
        case DW_LANG_Fortran03:         printf ("(Fortran 03)"); break;
        case DW_LANG_Fortran08:         printf ("(Fortran 08)"); break;
        case DW_LANG_RenderScript:      printf ("(RenderScript)"); break;
          /* MIPS extension.  */
        case DW_LANG_Mips_Assembler:    printf ("(MIPS assembler)"); break;
          /* UPC extension.  */
        case DW_LANG_Upc:               printf ("(Unified Parallel C)"); break;
        default:
          if (uvalue >= DW_LANG_lo_user && uvalue <= DW_LANG_hi_user)
            printf (_("(implementation defined: %#" PRIx64 ")"), uvalue);
          else
            printf (_("(unknown: %#" PRIx64 ")"), uvalue);
          break;
        }
      break;

    case DW_AT_encoding:
      printf ("\t");
      switch (uvalue)
        {
        case DW_ATE_void:               printf ("(void)"); break;
        case DW_ATE_address:            printf ("(machine address)"); break;
        case DW_ATE_boolean:            printf ("(boolean)"); break;
        case DW_ATE_complex_float:      printf ("(complex float)"); break;
        case DW_ATE_float:              printf ("(float)"); break;
        case DW_ATE_signed:             printf ("(signed)"); break;
        case DW_ATE_signed_char:        printf ("(signed char)"); break;
        case DW_ATE_unsigned:           printf ("(unsigned)"); break;
        case DW_ATE_unsigned_char:      printf ("(unsigned char)"); break;
          /* DWARF 2.1 values:  */
        case DW_ATE_imaginary_float:    printf ("(imaginary float)"); break;
        case DW_ATE_decimal_float:      printf ("(decimal float)"); break;
          /* DWARF 3 values:  */
        case DW_ATE_packed_decimal:     printf ("(packed_decimal)"); break;
        case DW_ATE_numeric_string:     printf ("(numeric_string)"); break;
        case DW_ATE_edited:             printf ("(edited)"); break;
        case DW_ATE_signed_fixed:       printf ("(signed_fixed)"); break;
        case DW_ATE_unsigned_fixed:     printf ("(unsigned_fixed)"); break;
          /* DWARF 4 values:  */
        case DW_ATE_UTF:                printf ("(unicode string)"); break;
          /* DWARF 5 values:  */
        case DW_ATE_UCS:                printf ("(UCS)"); break;
        case DW_ATE_ASCII:              printf ("(ASCII)"); break;

          /* HP extensions:  */
        case DW_ATE_HP_float80:         printf ("(HP_float80)"); break;
        case DW_ATE_HP_complex_float80: printf ("(HP_complex_float80)"); break;
        case DW_ATE_HP_float128:        printf ("(HP_float128)"); break;
        case DW_ATE_HP_complex_float128:printf ("(HP_complex_float128)"); break;
        case DW_ATE_HP_floathpintel:    printf ("(HP_floathpintel)"); break;
        case DW_ATE_HP_imaginary_float80:       printf ("(HP_imaginary_float80)"); break;
        case DW_ATE_HP_imaginary_float128:      printf ("(HP_imaginary_float128)"); break;

        default:
          if (uvalue >= DW_ATE_lo_user
              && uvalue <= DW_ATE_hi_user)
            printf (_("(user defined type)"));
          else
            printf (_("(unknown type)"));
          break;
        }
      break;

    case DW_AT_accessibility:
      printf ("\t");
      switch (uvalue)
        {
        case DW_ACCESS_public:          printf ("(public)"); break;
        case DW_ACCESS_protected:       printf ("(protected)"); break;
        case DW_ACCESS_private:         printf ("(private)"); break;
        default:
          printf (_("(unknown accessibility)"));
          break;
        }
      break;

    case DW_AT_visibility:
      printf ("\t");
      switch (uvalue)
        {
        case DW_VIS_local:              printf ("(local)"); break;
        case DW_VIS_exported:           printf ("(exported)"); break;
        case DW_VIS_qualified:          printf ("(qualified)"); break;
        default:                        printf (_("(unknown visibility)")); break;
        }
      break;

    case DW_AT_endianity:
      printf ("\t");
      switch (uvalue)
        {
        case DW_END_default:            printf ("(default)"); break;
        case DW_END_big:                printf ("(big)"); break;
        case DW_END_little:             printf ("(little)"); break;
        default:
          if (uvalue >= DW_END_lo_user && uvalue <= DW_END_hi_user)
            printf (_("(user specified)"));
          else
            printf (_("(unknown endianity)"));
          break;
        }
      break;

    case DW_AT_virtuality:
      printf ("\t");
      switch (uvalue)
        {
        case DW_VIRTUALITY_none:        printf ("(none)"); break;
        case DW_VIRTUALITY_virtual:     printf ("(virtual)"); break;
        case DW_VIRTUALITY_pure_virtual:printf ("(pure_virtual)"); break;
        default:                        printf (_("(unknown virtuality)")); break;
        }
      break;

    case DW_AT_identifier_case:
      printf ("\t");
      switch (uvalue)
        {
        case DW_ID_case_sensitive:      printf ("(case_sensitive)"); break;
        case DW_ID_up_case:             printf ("(up_case)"); break;
        case DW_ID_down_case:           printf ("(down_case)"); break;
        case DW_ID_case_insensitive:    printf ("(case_insensitive)"); break;
        default:                        printf (_("(unknown case)")); break;
        }
      break;

    case DW_AT_calling_convention:
      printf ("\t");
      switch (uvalue)
        {
        case DW_CC_normal:      printf ("(normal)"); break;
        case DW_CC_program:     printf ("(program)"); break;
        case DW_CC_nocall:      printf ("(nocall)"); break;
        case DW_CC_pass_by_reference: printf ("(pass by ref)"); break;
        case DW_CC_pass_by_value: printf ("(pass by value)"); break;
        case DW_CC_GNU_renesas_sh: printf ("(Rensas SH)"); break;
        case DW_CC_GNU_borland_fastcall_i386: printf ("(Borland fastcall i386)"); break;
        default:
          if (uvalue >= DW_CC_lo_user
              && uvalue <= DW_CC_hi_user)
            printf (_("(user defined)"));
          else
            printf (_("(unknown convention)"));
        }
      break;

    case DW_AT_ordering:
      printf ("\t");
      switch (uvalue)
        {
        case 255:
        case -1: printf (_("(undefined)")); break;
        case 0:  printf ("(row major)"); break;
        case 1:  printf ("(column major)"); break;
        }
      break;

    case DW_AT_decimal_sign:
      printf ("\t");
      switch (uvalue)
        {
        case DW_DS_unsigned:            printf (_("(unsigned)")); break;
        case DW_DS_leading_overpunch:   printf (_("(leading overpunch)")); break;
        case DW_DS_trailing_overpunch:  printf (_("(trailing overpunch)")); break;
        case DW_DS_leading_separate:    printf (_("(leading separate)")); break;
        case DW_DS_trailing_separate:   printf (_("(trailing separate)")); break;
        default:                        printf (_("(unrecognised)")); break;
        }
      break;

    case DW_AT_defaulted:
      printf ("\t");
      switch (uvalue)
        {
        case DW_DEFAULTED_no:           printf (_("(no)")); break;
        case DW_DEFAULTED_in_class:     printf (_("(in class)")); break;
        case DW_DEFAULTED_out_of_class: printf (_("(out of class)")); break;
        default:                        printf (_("(unrecognised)")); break;
        }
      break;

    case DW_AT_discr_list:
      printf ("\t");
      display_discr_list (form, uvalue, data, level);
      break;

    case DW_AT_frame_base:
      have_frame_base = 1;
      /* Fall through.  */
    case DW_AT_location:
    case DW_AT_loclists_base:
    case DW_AT_rnglists_base:
    case DW_AT_str_offsets_base:
    case DW_AT_string_length:
    case DW_AT_return_addr:
    case DW_AT_data_member_location:
    case DW_AT_vtable_elem_location:
    case DW_AT_segment:
    case DW_AT_static_link:
    case DW_AT_use_location:
    case DW_AT_call_value:
    case DW_AT_GNU_call_site_value:
    case DW_AT_call_data_value:
    case DW_AT_GNU_call_site_data_value:
    case DW_AT_call_target:
    case DW_AT_GNU_call_site_target:
    case DW_AT_call_target_clobbered:
    case DW_AT_GNU_call_site_target_clobbered:
      if ((dwarf_version < 4
           && (form == DW_FORM_data4 || form == DW_FORM_data8))
          || form == DW_FORM_sec_offset
          || form == DW_FORM_loclistx)
        {
          if (attribute != DW_AT_rnglists_base
              && attribute != DW_AT_str_offsets_base)
            printf (_(" (location list)"));
        }
      /* Fall through.  */
    case DW_AT_allocated:
    case DW_AT_associated:
    case DW_AT_data_location:
    case DW_AT_stride:
    case DW_AT_upper_bound:
    case DW_AT_lower_bound:
    case DW_AT_rank:
      if (block_start)
        {
          int need_frame_base;

          printf ("\t(");
          need_frame_base = decode_location_expression (block_start,
                                                        pointer_size,
                                                        offset_size,
                                                        dwarf_version,
                                                        uvalue,
                                                        cu_offset, section);
          printf (")");
          if (need_frame_base && !have_frame_base)
            printf (_(" [without DW_AT_frame_base]"));
        }
      break;

    case DW_AT_data_bit_offset:
    case DW_AT_byte_size:
    case DW_AT_bit_size:
    case DW_AT_string_length_byte_size:
    case DW_AT_string_length_bit_size:
    case DW_AT_bit_stride:
      if (form == DW_FORM_exprloc)
        {
          printf ("\t(");
          (void) decode_location_expression (block_start, pointer_size,
                                             offset_size, dwarf_version,
                                             uvalue, cu_offset, section);
          printf (")");
        }
      break;

    case DW_AT_import:
      {
        unsigned long abbrev_number;
        abbrev_entry *entry;

        entry = get_type_abbrev_from_form (form, uvalue, cu_offset, end,
                                           section, & abbrev_number, NULL, NULL);
        if (entry == NULL)
          {
            if (form != DW_FORM_GNU_ref_alt)
              warn (_("Offset %#" PRIx64 " used as value for DW_AT_import attribute of DIE at offset %#tx is too big.\n"),
                    uvalue,
                    orig_data - section->start);
          }
        else
          {
            printf (_("\t[Abbrev Number: %ld"), abbrev_number);
            printf (" (%s)", get_TAG_name (entry->tag));
            printf ("]");
          }
      }
      break;

    default:
      break;
    }

  return data;
}

static unsigned char *
read_and_display_attr (unsigned long attribute,
                       unsigned long form,
                       int64_t implicit_const,
                       unsigned char *start,
                       unsigned char *data,
                       unsigned char *end,
                       uint64_t cu_offset,
                       uint64_t pointer_size,
                       uint64_t offset_size,
                       int dwarf_version,
                       debug_info *debug_info_p,
                       int do_loc,
                       struct dwarf_section *section,
                       struct cu_tu_set *this_set,
                       int level)
{
  if (!do_loc)
    printf ("   %-18s:", get_AT_name (attribute));
  data = read_and_display_attr_value (attribute, form, implicit_const,
                                      start, data, end,
                                      cu_offset, pointer_size, offset_size,
                                      dwarf_version, debug_info_p,
                                      do_loc, section, this_set, ' ', level);
  if (!do_loc)
    printf ("\n");
  return data;
}

/* Like load_debug_section, but if the ordinary call fails, and we are
   following debug links, then attempt to load the requested section
   from one of the separate debug info files.  */

static bool
load_debug_section_with_follow (enum dwarf_section_display_enum sec_enum,
                                void * handle)
{
  if (load_debug_section (sec_enum, handle))
    {
      if (debug_displays[sec_enum].section.filename == NULL)
        {
          /* See if we can associate a filename with this section.  */
          separate_info * i;

          for (i = first_separate_info; i != NULL; i = i->next)
            if (i->handle == handle)
              {
                debug_displays[sec_enum].section.filename = i->filename;
                break;
              }
        }

      return true;
    }

  if (do_follow_links)
    {
      separate_info * i;

      for (i = first_separate_info; i != NULL; i = i->next)
        {
          if (load_debug_section (sec_enum, i->handle))
            {
              debug_displays[sec_enum].section.filename = i->filename;

              /* FIXME: We should check to see if any of the remaining debug info
                 files also contain this section, and, umm, do something about it.  */
              return true;
            }
        }
    }

  return false;
}

static void
introduce (struct dwarf_section * section, bool raw)
{
  if (raw)
    {
      if (do_follow_links && section->filename)
        printf (_("Raw dump of debug contents of section %s (loaded from %s):\n\n"),
                section->name, section->filename);
      else
        printf (_("Raw dump of debug contents of section %s:\n\n"), section->name);
    }
  else
    {
      if (do_follow_links && section->filename)
        printf (_("Contents of the %s section (loaded from %s):\n\n"),
                section->name, section->filename);
      else
        printf (_("Contents of the %s section:\n\n"), section->name);
    }
}

/* Free memory allocated for one unit in debug_information.  */

static void
free_debug_information (debug_info *ent)
{
  if (ent->max_loc_offsets)
    {
      free (ent->loc_offsets);
      free (ent->loc_views);
      free (ent->have_frame_base);
    }
  if (ent->max_range_lists)
    free (ent->range_lists);
}

/* Process the contents of a .debug_info section.
   If do_loc is TRUE then we are scanning for location lists and dwo tags
   and we do not want to display anything to the user.
   If do_types is TRUE, we are processing a .debug_types section instead of
   a .debug_info section.
   The information displayed is restricted by the values in DWARF_START_DIE
   and DWARF_CUTOFF_LEVEL.
   Returns TRUE upon success.  Otherwise an error or warning message is
   printed and FALSE is returned.  */

static bool
process_debug_info (struct dwarf_section * section,
                    void *file,
                    enum dwarf_section_display_enum abbrev_sec,
                    bool do_loc,
                    bool do_types)
{
  unsigned char *start = section->start;
  unsigned char *end = start + section->size;
  unsigned char *section_begin;
  unsigned int unit;
  unsigned int num_units = 0;

  /* First scan the section to get the number of comp units.
     Length sanity checks are done here.  */
  for (section_begin = start, num_units = 0; section_begin < end;
       num_units ++)
    {
      uint64_t length;

      /* Read the first 4 bytes.  For a 32-bit DWARF section, this
         will be the length.  For a 64-bit DWARF section, it'll be
         the escape code 0xffffffff followed by an 8 byte length.  */
      SAFE_BYTE_GET_AND_INC (length, section_begin, 4, end);

      if (length == 0xffffffff)
        SAFE_BYTE_GET_AND_INC (length, section_begin, 8, end);
      else if (length >= 0xfffffff0 && length < 0xffffffff)
        {
          warn (_("Reserved length value (%#" PRIx64 ") found in section %s\n"),
                length, section->name);
          return false;
        }

      /* Negative values are illegal, they may even cause infinite
         looping.  This can happen if we can't accurately apply
         relocations to an object file, or if the file is corrupt.  */
      if (length > (size_t) (end - section_begin))
        {
          warn (_("Corrupt unit length (got %#" PRIx64
                  " expected at most %#tx) in section %s\n"),
                length, end - section_begin, section->name);
          return false;
        }
      section_begin += length;
    }

  if (num_units == 0)
    {
      error (_("No comp units in %s section ?\n"), section->name);
      return false;
    }

  if ((do_loc || do_debug_loc || do_debug_ranges || do_debug_info)
      && num_debug_info_entries == 0
      && ! do_types)
    {

      /* Then allocate an array to hold the information.  */
      debug_information = (debug_info *) cmalloc (num_units,
                                                  sizeof (* debug_information));
      if (debug_information == NULL)
        {
          error (_("Not enough memory for a debug info array of %u entries\n"),
                 num_units);
          alloc_num_debug_info_entries = num_debug_info_entries = 0;
          return false;
        }

      /* PR 17531: file: 92ca3797.
         We cannot rely upon the debug_information array being initialised
         before it is used.  A corrupt file could easily contain references
         to a unit for which information has not been made available.  So
         we ensure that the array is zeroed here.  */
      memset (debug_information, 0, num_units * sizeof (*debug_information));

      alloc_num_debug_info_entries = num_units;
    }

  if (!do_loc)
    {
      load_debug_section_with_follow (str, file);
      load_debug_section_with_follow (line_str, file);
      load_debug_section_with_follow (str_dwo, file);
      load_debug_section_with_follow (str_index, file);
      load_debug_section_with_follow (str_index_dwo, file);
      load_debug_section_with_follow (debug_addr, file);
    }

  load_debug_section_with_follow (abbrev_sec, file);
  load_debug_section_with_follow (loclists, file);
  load_debug_section_with_follow (rnglists, file);
  load_debug_section_with_follow (loclists_dwo, file);
  load_debug_section_with_follow (rnglists_dwo, file);

  if (debug_displays [abbrev_sec].section.start == NULL)
    {
      warn (_("Unable to locate %s section!\n"),
            debug_displays [abbrev_sec].section.uncompressed_name);
      return false;
    }

  if (!do_loc && dwarf_start_die == 0)
    introduce (section, false);

  free_all_abbrevs ();

  /* In order to be able to resolve DW_FORM_ref_addr forms we need
     to load *all* of the abbrevs for all CUs in this .debug_info
     section.  This does effectively mean that we (partially) read
     every CU header twice.  */
  for (section_begin = start; start < end;)
    {
      DWARF2_Internal_CompUnit compunit;
      unsigned char *hdrptr;
      uint64_t abbrev_base;
      size_t abbrev_size;
      uint64_t cu_offset;
      unsigned int offset_size;
      struct cu_tu_set *this_set;
      unsigned char *end_cu;

      hdrptr = start;
      cu_offset = start - section_begin;

      SAFE_BYTE_GET_AND_INC (compunit.cu_length, hdrptr, 4, end);

      if (compunit.cu_length == 0xffffffff)
        {
          SAFE_BYTE_GET_AND_INC (compunit.cu_length, hdrptr, 8, end);
          offset_size = 8;
        }
      else
        offset_size = 4;
      end_cu = hdrptr + compunit.cu_length;

      SAFE_BYTE_GET_AND_INC (compunit.cu_version, hdrptr, 2, end_cu);

      this_set = find_cu_tu_set_v2 (cu_offset, do_types);

      if (compunit.cu_version < 5)
        {
          compunit.cu_unit_type = DW_UT_compile;
          /* Initialize it due to a false compiler warning.  */
          compunit.cu_pointer_size = -1;
        }
      else
        {
          SAFE_BYTE_GET_AND_INC (compunit.cu_unit_type, hdrptr, 1, end_cu);
          do_types = (compunit.cu_unit_type == DW_UT_type);

          SAFE_BYTE_GET_AND_INC (compunit.cu_pointer_size, hdrptr, 1, end_cu);
        }

      SAFE_BYTE_GET_AND_INC (compunit.cu_abbrev_offset, hdrptr, offset_size,
                             end_cu);

      if (compunit.cu_unit_type == DW_UT_split_compile
          || compunit.cu_unit_type == DW_UT_skeleton)
        {
          uint64_t dwo_id;
          SAFE_BYTE_GET_AND_INC (dwo_id, hdrptr, 8, end_cu);
        }

      if (this_set == NULL)
        {
          abbrev_base = 0;
          abbrev_size = debug_displays [abbrev_sec].section.size;
        }
      else
        {
          abbrev_base = this_set->section_offsets [DW_SECT_ABBREV];
          abbrev_size = this_set->section_sizes [DW_SECT_ABBREV];
        }

      abbrev_list *list;
      abbrev_list *free_list;
      list = find_and_process_abbrev_set (&debug_displays[abbrev_sec].section,
                                          abbrev_base, abbrev_size,
                                          compunit.cu_abbrev_offset,
                                          &free_list);
      start = end_cu;
      if (list != NULL && list->first_abbrev != NULL)
        record_abbrev_list_for_cu (cu_offset, start - section_begin,
                                   list, free_list);
      else if (free_list != NULL)
        free_abbrev_list (free_list);
    }

  for (start = section_begin, unit = 0; start < end; unit++)
    {
      DWARF2_Internal_CompUnit compunit;
      unsigned char *hdrptr;
      unsigned char *tags;
      int level, last_level, saved_level;
      uint64_t cu_offset;
      unsigned int offset_size;
      uint64_t signature = 0;
      uint64_t type_offset = 0;
      struct cu_tu_set *this_set;
      uint64_t abbrev_base;
      size_t abbrev_size;
      unsigned char *end_cu;

      hdrptr = start;
      cu_offset = start - section_begin;

      SAFE_BYTE_GET_AND_INC (compunit.cu_length, hdrptr, 4, end);

      if (compunit.cu_length == 0xffffffff)
        {
          SAFE_BYTE_GET_AND_INC (compunit.cu_length, hdrptr, 8, end);
          offset_size = 8;
        }
      else
        offset_size = 4;
      end_cu = hdrptr + compunit.cu_length;

      SAFE_BYTE_GET_AND_INC (compunit.cu_version, hdrptr, 2, end_cu);

      this_set = find_cu_tu_set_v2 (cu_offset, do_types);

      if (compunit.cu_version < 5)
        {
          compunit.cu_unit_type = DW_UT_compile;
          /* Initialize it due to a false compiler warning.  */
          compunit.cu_pointer_size = -1;
        }
      else
        {
          SAFE_BYTE_GET_AND_INC (compunit.cu_unit_type, hdrptr, 1, end_cu);
          do_types = (compunit.cu_unit_type == DW_UT_type);

          SAFE_BYTE_GET_AND_INC (compunit.cu_pointer_size, hdrptr, 1, end_cu);
        }

      SAFE_BYTE_GET_AND_INC (compunit.cu_abbrev_offset, hdrptr, offset_size, end_cu);

      if (this_set == NULL)
        {
          abbrev_base = 0;
          abbrev_size = debug_displays [abbrev_sec].section.size;
        }
      else
        {
          abbrev_base = this_set->section_offsets [DW_SECT_ABBREV];
          abbrev_size = this_set->section_sizes [DW_SECT_ABBREV];
        }

      if (compunit.cu_version < 5)
        SAFE_BYTE_GET_AND_INC (compunit.cu_pointer_size, hdrptr, 1, end_cu);

      bool do_dwo_id = false;
      uint64_t dwo_id = 0;
      if (compunit.cu_unit_type == DW_UT_split_compile
          || compunit.cu_unit_type == DW_UT_skeleton)
        {
          SAFE_BYTE_GET_AND_INC (dwo_id, hdrptr, 8, end_cu);
          do_dwo_id = true;
        }

      /* PR 17512: file: 001-108546-0.001:0.1.  */
      if (compunit.cu_pointer_size < 2 || compunit.cu_pointer_size > 8)
        {
          warn (_("Invalid pointer size (%d) in compunit header, using %d instead\n"),
                compunit.cu_pointer_size, offset_size);
          compunit.cu_pointer_size = offset_size;
        }

      if (do_types)
        {
          SAFE_BYTE_GET_AND_INC (signature, hdrptr, 8, end_cu);
          SAFE_BYTE_GET_AND_INC (type_offset, hdrptr, offset_size, end_cu);
        }

      if (dwarf_start_die >= (size_t) (end_cu - section_begin))
        {
          start = end_cu;
          continue;
        }

      if ((do_loc || do_debug_loc || do_debug_ranges || do_debug_info)
          && num_debug_info_entries == 0
          && alloc_num_debug_info_entries > unit
          && ! do_types)
        {
          free_debug_information (&debug_information[unit]);
          memset (&debug_information[unit], 0, sizeof (*debug_information));
          debug_information[unit].pointer_size = compunit.cu_pointer_size;
          debug_information[unit].offset_size = offset_size;
          debug_information[unit].dwarf_version = compunit.cu_version;
          debug_information[unit].cu_offset = cu_offset;
          debug_information[unit].addr_base = DEBUG_INFO_UNAVAILABLE;
          debug_information[unit].ranges_base = DEBUG_INFO_UNAVAILABLE;
        }

      if (!do_loc && dwarf_start_die == 0)
        {
          printf (_("  Compilation Unit @ offset %#" PRIx64 ":\n"),
                  cu_offset);
          printf (_("   Length:        %#" PRIx64 " (%s)\n"),
                  compunit.cu_length,
                  offset_size == 8 ? "64-bit" : "32-bit");
          printf (_("   Version:       %d\n"), compunit.cu_version);
          if (compunit.cu_version >= 5)
            {
              const char *name = get_DW_UT_name (compunit.cu_unit_type);

              printf (_("   Unit Type:     %s (%x)\n"),
                      null_name (name),
                      compunit.cu_unit_type);
            }
          printf (_("   Abbrev Offset: %#" PRIx64 "\n"),
                  compunit.cu_abbrev_offset);
          printf (_("   Pointer Size:  %d\n"), compunit.cu_pointer_size);
          if (do_types)
            {
              printf (_("   Signature:     %#" PRIx64 "\n"), signature);
              printf (_("   Type Offset:   %#" PRIx64 "\n"), type_offset);
            }
          if (do_dwo_id)
            printf (_("   DWO ID:        %#" PRIx64 "\n"), dwo_id);
          if (this_set != NULL)
            {
              uint64_t *offsets = this_set->section_offsets;
              size_t *sizes = this_set->section_sizes;

              printf (_("   Section contributions:\n"));
              printf (_("    .debug_abbrev.dwo:       %#" PRIx64 "  %#zx\n"),
                      offsets[DW_SECT_ABBREV], sizes[DW_SECT_ABBREV]);
              printf (_("    .debug_line.dwo:         %#" PRIx64 "  %#zx\n"),
                      offsets[DW_SECT_LINE], sizes[DW_SECT_LINE]);
              printf (_("    .debug_loc.dwo:          %#" PRIx64 "  %#zx\n"),
                      offsets[DW_SECT_LOC], sizes[DW_SECT_LOC]);
              printf (_("    .debug_str_offsets.dwo:  %#" PRIx64 "  %#zx\n"),
                      offsets[DW_SECT_STR_OFFSETS], sizes[DW_SECT_STR_OFFSETS]);
            }
        }

      tags = hdrptr;
      start = end_cu;

      if (compunit.cu_version < 2 || compunit.cu_version > 5)
        {
          warn (_("CU at offset %#" PRIx64 " contains corrupt or "
                  "unsupported version number: %d.\n"),
                cu_offset, compunit.cu_version);
          continue;
        }

      if (compunit.cu_unit_type != DW_UT_compile
          && compunit.cu_unit_type != DW_UT_partial
          && compunit.cu_unit_type != DW_UT_type
          && compunit.cu_unit_type != DW_UT_split_compile
          && compunit.cu_unit_type != DW_UT_skeleton)
        {
          warn (_("CU at offset %#" PRIx64 " contains corrupt or "
                  "unsupported unit type: %d.\n"),
                cu_offset, compunit.cu_unit_type);
          continue;
        }

      /* Process the abbrevs used by this compilation unit.  */
      abbrev_list *list;
      list = find_and_process_abbrev_set (&debug_displays[abbrev_sec].section,
                                          abbrev_base, abbrev_size,
                                          compunit.cu_abbrev_offset, NULL);
      level = 0;
      last_level = level;
      saved_level = -1;
      while (tags < start)
        {
          unsigned long abbrev_number;
          unsigned long die_offset;
          abbrev_entry *entry;
          abbrev_attr *attr;
          int do_printing = 1;

          die_offset = tags - section_begin;

          READ_ULEB (abbrev_number, tags, start);

          /* A null DIE marks the end of a list of siblings or it may also be
             a section padding.  */
          if (abbrev_number == 0)
            {
              /* Check if it can be a section padding for the last CU.  */
              if (level == 0 && start == end)
                {
                  unsigned char *chk;

                  for (chk = tags; chk < start; chk++)
                    if (*chk != 0)
                      break;
                  if (chk == start)
                    break;
                }

              if (!do_loc && die_offset >= dwarf_start_die
                  && (dwarf_cutoff_level == -1
                      || level < dwarf_cutoff_level))
                printf (_(" <%d><%lx>: Abbrev Number: 0\n"),
                        level, die_offset);

              --level;
              if (level < 0)
                {
                  static unsigned num_bogus_warns = 0;

                  if (num_bogus_warns < 3)
                    {
                      warn (_("Bogus end-of-siblings marker detected at offset %lx in %s section\n"),
                            die_offset, section->name);
                      num_bogus_warns ++;
                      if (num_bogus_warns == 3)
                        warn (_("Further warnings about bogus end-of-sibling markers suppressed\n"));
                    }
                }
              if (dwarf_start_die != 0 && level < saved_level)
                return true;
              continue;
            }

          if (!do_loc)
            {
              if (dwarf_start_die != 0 && die_offset < dwarf_start_die)
                do_printing = 0;
              else
                {
                  if (dwarf_start_die != 0 && die_offset == dwarf_start_die)
                    saved_level = level;
                  do_printing = (dwarf_cutoff_level == -1
                                 || level < dwarf_cutoff_level);
                  if (do_printing)
                    printf (_(" <%d><%lx>: Abbrev Number: %lu"),
                            level, die_offset, abbrev_number);
                  else if (dwarf_cutoff_level == -1
                           || last_level < dwarf_cutoff_level)
                    printf (_(" <%d><%lx>: ...\n"), level, die_offset);
                  last_level = level;
                }
            }

          /* Scan through the abbreviation list until we reach the
             correct entry.  */
          entry = NULL;
          if (list != NULL)
            for (entry = list->first_abbrev; entry != NULL; entry = entry->next)
              if (entry->number == abbrev_number)
                break;

          if (entry == NULL)
            {
              if (!do_loc && do_printing)
                {
                  printf ("\n");
                  fflush (stdout);
                }
              warn (_("DIE at offset %#lx refers to abbreviation number %lu which does not exist\n"),
                    die_offset, abbrev_number);
              return false;
            }

          if (!do_loc && do_printing)
            printf (" (%s)\n", get_TAG_name (entry->tag));

          switch (entry->tag)
            {
            default:
              need_base_address = 0;
              break;
            case DW_TAG_compile_unit:
            case DW_TAG_skeleton_unit:
              need_base_address = 1;
              need_dwo_info = do_loc;
              break;
            case DW_TAG_entry_point:
            case DW_TAG_subprogram:
              need_base_address = 0;
              /* Assuming that there is no DW_AT_frame_base.  */
              have_frame_base = 0;
              break;
            }

          debug_info *debug_info_p =
            (debug_information && unit < alloc_num_debug_info_entries)
            ? debug_information + unit : NULL;

          assert (!debug_info_p
                  || (debug_info_p->num_loc_offsets
                      == debug_info_p->num_loc_views));

          for (attr = entry->first_attr;
               attr && attr->attribute;
               attr = attr->next)
            {
              if (! do_loc && do_printing)
                /* Show the offset from where the tag was extracted.  */
                printf ("    <%tx>", tags - section_begin);
              tags = read_and_display_attr (attr->attribute,
                                            attr->form,
                                            attr->implicit_const,
                                            section_begin,
                                            tags,
                                            start,
                                            cu_offset,
                                            compunit.cu_pointer_size,
                                            offset_size,
                                            compunit.cu_version,
                                            debug_info_p,
                                            do_loc || ! do_printing,
                                            section,
                                            this_set,
                                            level);
            }

          /* If a locview attribute appears before a location one,
             make sure we don't associate it with an earlier
             loclist. */
          if (debug_info_p)
            switch (debug_info_p->num_loc_offsets - debug_info_p->num_loc_views)
              {
              case 1:
                debug_info_p->loc_views [debug_info_p->num_loc_views] = -1;
                debug_info_p->num_loc_views++;
                assert (debug_info_p->num_loc_views
                        == debug_info_p->num_loc_offsets);
                break;

              case 0:
                break;

              case -1:
                warn(_("DIE has locviews without loclist\n"));
                debug_info_p->num_loc_views--;
                break;

              default:
                assert (0);
            }

          if (entry->children)
            ++level;
        }
      if (list != NULL)
        free_abbrev_list (list);
    }

  /* Set num_debug_info_entries here so that it can be used to check if
     we need to process .debug_loc and .debug_ranges sections.  */
  if ((do_loc || do_debug_loc || do_debug_ranges || do_debug_info)
      && num_debug_info_entries == 0
      && ! do_types)
    {
      if (num_units > alloc_num_debug_info_entries)
        num_debug_info_entries = alloc_num_debug_info_entries;
      else
        num_debug_info_entries = num_units;
    }

  if (!do_loc)
    printf ("\n");

  return true;
}

/* Locate and scan the .debug_info section in the file and record the pointer
   sizes and offsets for the compilation units in it.  Usually an executable
   will have just one pointer size, but this is not guaranteed, and so we try
   not to make any assumptions.  Returns zero upon failure, or the number of
   compilation units upon success.  */

static unsigned int
load_debug_info (void * file)
{
  /* If we have already tried and failed to load the .debug_info
     section then do not bother to repeat the task.  */
  if (num_debug_info_entries == DEBUG_INFO_UNAVAILABLE)
    return 0;

  /* If we already have the information there is nothing else to do.  */
  if (num_debug_info_entries > 0)
    return num_debug_info_entries;

  /* If this is a DWARF package file, load the CU and TU indexes.  */
  (void) load_cu_tu_indexes (file);

  if (load_debug_section_with_follow (info, file)
      && process_debug_info (&debug_displays [info].section, file, abbrev, true, false))
    return num_debug_info_entries;

  if (load_debug_section_with_follow (info_dwo, file)
      && process_debug_info (&debug_displays [info_dwo].section, file,
                             abbrev_dwo, true, false))
    return num_debug_info_entries;

  num_debug_info_entries = DEBUG_INFO_UNAVAILABLE;
  return 0;
}

/* Read a DWARF .debug_line section header starting at DATA.
   Upon success returns an updated DATA pointer and the LINFO
   structure and the END_OF_SEQUENCE pointer will be filled in.
   Otherwise returns NULL.  */

static unsigned char *
read_debug_line_header (struct dwarf_section * section,
                        unsigned char * data,
                        unsigned char * end,
                        DWARF2_Internal_LineInfo * linfo,
                        unsigned char ** end_of_sequence)
{
  unsigned char *hdrptr;

  /* Extract information from the Line Number Program Header.
     (section 6.2.4 in the Dwarf3 doc).  */
  hdrptr = data;

  /* Get and check the length of the block.  */
  SAFE_BYTE_GET_AND_INC (linfo->li_length, hdrptr, 4, end);

  if (linfo->li_length == 0xffffffff)
    {
      /* This section is 64-bit DWARF 3.  */
      SAFE_BYTE_GET_AND_INC (linfo->li_length, hdrptr, 8, end);
      linfo->li_offset_size = 8;
    }
  else
    linfo->li_offset_size = 4;

  if (linfo->li_length > (size_t) (end - hdrptr))
    {
      /* If the length field has a relocation against it, then we should
         not complain if it is inaccurate (and probably negative).  This
         happens in object files when the .debug_line section is actually
         comprised of several different .debug_line.* sections, (some of
         which may be removed by linker garbage collection), and a relocation
         is used to compute the correct length once that is done.  */
      if (reloc_at (section, (hdrptr - section->start) - linfo->li_offset_size))
        {
          linfo->li_length = end - hdrptr;
        }
      else
        {
          warn (_("The length field (%#" PRIx64 ")"
                  " in the debug_line header is wrong"
                  " - the section is too small\n"),
                linfo->li_length);
          return NULL;
        }
    }
  end = hdrptr + linfo->li_length;

  /* Get and check the version number.  */
  SAFE_BYTE_GET_AND_INC (linfo->li_version, hdrptr, 2, end);

  if (linfo->li_version != 2
      && linfo->li_version != 3
      && linfo->li_version != 4
      && linfo->li_version != 5)
    {
      warn (_("Only DWARF version 2, 3, 4 and 5 line info "
              "is currently supported.\n"));
      return NULL;
    }

  if (linfo->li_version >= 5)
    {
      SAFE_BYTE_GET_AND_INC (linfo->li_address_size, hdrptr, 1, end);

      SAFE_BYTE_GET_AND_INC (linfo->li_segment_size, hdrptr, 1, end);
      if (linfo->li_segment_size != 0)
        {
          warn (_("The %s section contains "
                  "unsupported segment selector size: %d.\n"),
                section->name, linfo->li_segment_size);
          return NULL;
        }
    }

  SAFE_BYTE_GET_AND_INC (linfo->li_prologue_length, hdrptr,
                         linfo->li_offset_size, end);
  SAFE_BYTE_GET_AND_INC (linfo->li_min_insn_length, hdrptr, 1, end);

  if (linfo->li_version >= 4)
    {
      SAFE_BYTE_GET_AND_INC (linfo->li_max_ops_per_insn, hdrptr, 1, end);

      if (linfo->li_max_ops_per_insn == 0)
        {
          warn (_("Invalid maximum operations per insn.\n"));
          return NULL;
        }
    }
  else
    linfo->li_max_ops_per_insn = 1;

  SAFE_BYTE_GET_AND_INC (linfo->li_default_is_stmt, hdrptr, 1, end);
  SAFE_SIGNED_BYTE_GET_AND_INC (linfo->li_line_base, hdrptr, 1, end);
  SAFE_BYTE_GET_AND_INC (linfo->li_line_range, hdrptr, 1, end);
  SAFE_BYTE_GET_AND_INC (linfo->li_opcode_base, hdrptr, 1, end);

  *end_of_sequence = end;
  return hdrptr;
}

static unsigned char *
display_formatted_table (unsigned char *data,
                         unsigned char *start,
                         unsigned char *end,
                         const DWARF2_Internal_LineInfo *linfo,
                         struct dwarf_section *section,
                         bool is_dir)
{
  unsigned char *format_start, format_count, *format, formati;
  uint64_t data_count, datai;
  unsigned int namepass, last_entry = 0;
  const char * table_name = is_dir ? N_("Directory Table") : N_("File Name Table");

  SAFE_BYTE_GET_AND_INC (format_count, data, 1, end);
  if (do_checks && format_count > 5)
    warn (_("Unexpectedly large number of columns in the %s (%u)\n"),
          table_name, format_count);

  format_start = data;
  for (formati = 0; formati < format_count; formati++)
    {
      SKIP_ULEB (data, end);
      SKIP_ULEB (data, end);
      if (data >= end)
        {
          warn (_("%s: Corrupt format description entry\n"), table_name);
          return data;
        }
    }

  READ_ULEB (data_count, data, end);
  if (data_count == 0)
    {
      printf (_("\n The %s is empty.\n"), table_name);
      return data;
    }
  else if (data >= end)
    {
      warn (_("%s: Corrupt entry count - expected %#" PRIx64
              " but none found\n"), table_name, data_count);
      return data;
    }

  else if (format_count == 0)
    {
      warn (_("%s: format count is zero, but the table is not empty\n"),
            table_name);
      return end;
    }

  printf (_("\n The %s (offset %#tx, lines %" PRIu64 ", columns %u):\n"),
          table_name, data - start, data_count, format_count);

  printf (_("  Entry"));
  /* Delay displaying name as the last entry for better screen layout.  */
  for (namepass = 0; namepass < 2; namepass++)
    {
      format = format_start;
      for (formati = 0; formati < format_count; formati++)
        {
          uint64_t content_type;

          READ_ULEB (content_type, format, end);
          if ((content_type == DW_LNCT_path) == (namepass == 1))
            switch (content_type)
              {
              case DW_LNCT_path:
                printf (_("\tName"));
                break;
              case DW_LNCT_directory_index:
                printf (_("\tDir"));
                break;
              case DW_LNCT_timestamp:
                printf (_("\tTime"));
                break;
              case DW_LNCT_size:
                printf (_("\tSize"));
                break;
              case DW_LNCT_MD5:
                printf (_("\tMD5\t\t\t"));
                break;
              default:
                printf (_("\t(Unknown format content type %" PRIu64 ")"),
                        content_type);
              }
          SKIP_ULEB (format, end);
        }
    }
  putchar ('\n');

  for (datai = 0; datai < data_count; datai++)
    {
      unsigned char *datapass = data;

      printf ("  %d", last_entry++);
      /* Delay displaying name as the last entry for better screen layout.  */
      for (namepass = 0; namepass < 2; namepass++)
        {
          format = format_start;
          data = datapass;
          for (formati = 0; formati < format_count; formati++)
            {
              uint64_t content_type, form;

              READ_ULEB (content_type, format, end);
              READ_ULEB (form, format, end);
              data = read_and_display_attr_value (0, form, 0, start, data, end,
                                                  0, 0, linfo->li_offset_size,
                                                  linfo->li_version, NULL,
                            ((content_type == DW_LNCT_path) != (namepass == 1)),
                                                  section, NULL, '\t', -1);
            }
        }

      if (data >= end && (datai < data_count - 1))
        {
          warn (_("\n%s: Corrupt entries list\n"), table_name);
          return data;
        }
      putchar ('\n');
    }
  return data;
}

static int
display_debug_sup (struct dwarf_section *  section,
                   void *                  file ATTRIBUTE_UNUSED)
{
  unsigned char * start = section->start;
  unsigned char * end = section->start + section->size;
  unsigned int version;
  char is_supplementary;
  const unsigned char * sup_filename;
  size_t sup_filename_len;
  unsigned int num_read;
  int status;
  uint64_t checksum_len;


  introduce (section, true);
  if (section->size < 4)
    {
      error (_("corrupt .debug_sup section: size is too small\n"));
      return 0;
    }

  /* Read the data.  */
  SAFE_BYTE_GET_AND_INC (version, start, 2, end);
  if (version < 5)
    warn (_("corrupt .debug_sup section: version < 5"));

  SAFE_BYTE_GET_AND_INC (is_supplementary, start, 1, end);
  if (is_supplementary != 0 && is_supplementary != 1)
    warn (_("corrupt .debug_sup section: is_supplementary not 0 or 1\n"));

  sup_filename = start;
  if (is_supplementary && sup_filename[0] != 0)
    warn (_("corrupt .debug_sup section: filename not empty in supplementary section\n"));

  sup_filename_len = strnlen ((const char *) start, end - start);
  if (sup_filename_len == (size_t) (end - start))
    {
      error (_("corrupt .debug_sup section: filename is not NUL terminated\n"));
      return 0;
    }
  start += sup_filename_len + 1;

  checksum_len = read_leb128 (start, end, false /* unsigned */, & num_read, & status);
  if (status)
    {
      error (_("corrupt .debug_sup section: bad LEB128 field for checksum length\n"));
      checksum_len = 0;
    }
  start += num_read;
  if (checksum_len > (size_t) (end - start))
    {
      error (_("corrupt .debug_sup section: checksum length is longer than the remaining section length\n"));
      checksum_len = end - start;
    }
  else if (checksum_len < (size_t) (end - start))
    {
      warn (_("corrupt .debug_sup section: there are %#" PRIx64
              " extra, unused bytes at the end of the section\n"),
            (end - start) - checksum_len);
    }

  printf (_("  Version:      %u\n"), version);
  printf (_("  Is Supp:      %u\n"), is_supplementary);
  printf (_("  Filename:     %s\n"), sup_filename);
  printf (_("  Checksum Len: %" PRIu64 "\n"), checksum_len);
  if (checksum_len > 0)
    {
      printf (_("  Checksum:     "));
      while (checksum_len--)
        printf ("0x%x ", * start++ );
      printf ("\n");
    }
  return 1;
}

static int
display_debug_lines_raw (struct dwarf_section *  section,
                         unsigned char *         data,
                         unsigned char *         end,
                         void *                  file)
{
  unsigned char *start = section->start;
  int verbose_view = 0;

  introduce (section, true);

  while (data < end)
    {
      static DWARF2_Internal_LineInfo saved_linfo;
      DWARF2_Internal_LineInfo linfo;
      unsigned char *standard_opcodes;
      unsigned char *end_of_sequence;
      int i;

      if (startswith (section->name, ".debug_line.")
          /* Note: the following does not apply to .debug_line.dwo sections.
             These are full debug_line sections.  */
          && strcmp (section->name, ".debug_line.dwo") != 0)
        {
          /* Sections named .debug_line.<foo> are fragments of a .debug_line
             section containing just the Line Number Statements.  They are
             created by the assembler and intended to be used alongside gcc's
             -ffunction-sections command line option.  When the linker's
             garbage collection decides to discard a .text.<foo> section it
             can then also discard the line number information in .debug_line.<foo>.

             Since the section is a fragment it does not have the details
             needed to fill out a LineInfo structure, so instead we use the
             details from the last full debug_line section that we processed.  */
          end_of_sequence = end;
          standard_opcodes = NULL;
          linfo = saved_linfo;
          /* PR 17531: file: 0522b371.  */
          if (linfo.li_line_range == 0)
            {
              warn (_("Partial .debug_line. section encountered without a prior full .debug_line section\n"));
              return 0;
            }
          reset_state_machine (linfo.li_default_is_stmt);
        }
      else
        {
          unsigned char * hdrptr;

          if ((hdrptr = read_debug_line_header (section, data, end, & linfo,
                                                & end_of_sequence)) == NULL)
            return 0;

          printf (_("  Offset:                      %#tx\n"), data - start);
          printf (_("  Length:                      %" PRId64 "\n"), linfo.li_length);
          printf (_("  DWARF Version:               %d\n"), linfo.li_version);
          if (linfo.li_version >= 5)
            {
              printf (_("  Address size (bytes):        %d\n"), linfo.li_address_size);
              printf (_("  Segment selector (bytes):    %d\n"), linfo.li_segment_size);
            }
          printf (_("  Prologue Length:             %d\n"), (int) linfo.li_prologue_length);
          printf (_("  Minimum Instruction Length:  %d\n"), linfo.li_min_insn_length);
          if (linfo.li_version >= 4)
            printf (_("  Maximum Ops per Instruction: %d\n"), linfo.li_max_ops_per_insn);
          printf (_("  Initial value of 'is_stmt':  %d\n"), linfo.li_default_is_stmt);
          printf (_("  Line Base:                   %d\n"), linfo.li_line_base);
          printf (_("  Line Range:                  %d\n"), linfo.li_line_range);
          printf (_("  Opcode Base:                 %d\n"), linfo.li_opcode_base);

          /* PR 17512: file: 1665-6428-0.004.  */
          if (linfo.li_line_range == 0)
            {
              warn (_("Line range of 0 is invalid, using 1 instead\n"));
              linfo.li_line_range = 1;
            }

          reset_state_machine (linfo.li_default_is_stmt);

          /* Display the contents of the Opcodes table.  */
          standard_opcodes = hdrptr;

          /* PR 17512: file: 002-417945-0.004.  */
          if (standard_opcodes + linfo.li_opcode_base >= end)
            {
              warn (_("Line Base extends beyond end of section\n"));
              return 0;
            }

          printf (_("\n Opcodes:\n"));

          for (i = 1; i < linfo.li_opcode_base; i++)
            printf (ngettext ("  Opcode %d has %d arg\n",
                              "  Opcode %d has %d args\n",
                              standard_opcodes[i - 1]),
                    i, standard_opcodes[i - 1]);

          /* Display the contents of the Directory table.  */
          data = standard_opcodes + linfo.li_opcode_base - 1;

          if (linfo.li_version >= 5)
            {
              load_debug_section_with_follow (line_str, file);

              data = display_formatted_table (data, start, end, &linfo, section,
                                              true);
              data = display_formatted_table (data, start, end, &linfo, section,
                                              false);
            }
          else
            {
              if (*data == 0)
                printf (_("\n The Directory Table is empty.\n"));
              else
                {
                  unsigned int last_dir_entry = 0;

                  printf (_("\n The Directory Table (offset %#tx):\n"),
                          data - start);

                  while (data < end && *data != 0)
                    {
                      printf ("  %d\t%.*s\n", ++last_dir_entry, (int) (end - data), data);

                      data += strnlen ((char *) data, end - data);
                      if (data < end)
                        data++;
                    }

                  /* PR 17512: file: 002-132094-0.004.  */
                  if (data >= end - 1)
                    break;
                }

              /* Skip the NUL at the end of the table.  */
              if (data < end)
                data++;

              /* Display the contents of the File Name table.  */
              if (data >= end || *data == 0)
                printf (_("\n The File Name Table is empty.\n"));
              else
                {
                  printf (_("\n The File Name Table (offset %#tx):\n"),
                          data - start);
                  printf (_("  Entry\tDir\tTime\tSize\tName\n"));

                  while (data < end && *data != 0)
                    {
                      unsigned char *name;
                      uint64_t val;

                      printf ("  %d\t", ++state_machine_regs.last_file_entry);
                      name = data;
                      data += strnlen ((char *) data, end - data);
                      if (data < end)
                        data++;

                      READ_ULEB (val, data, end);
                      printf ("%" PRIu64 "\t", val);
                      READ_ULEB (val, data, end);
                      printf ("%" PRIu64 "\t", val);
                      READ_ULEB (val, data, end);
                      printf ("%" PRIu64 "\t", val);
                      printf ("%.*s\n", (int)(end - name), name);

                      if (data >= end)
                        {
                          warn (_("Corrupt file name table entry\n"));
                          break;
                        }
                    }
                }

              /* Skip the NUL at the end of the table.  */
              if (data < end)
                data++;
            }

          putchar ('\n');
          saved_linfo = linfo;
        }

      /* Now display the statements.  */
      if (data >= end_of_sequence)
        printf (_(" No Line Number Statements.\n"));
      else
        {
          printf (_(" Line Number Statements:\n"));

          while (data < end_of_sequence)
            {
              unsigned char op_code;
              int64_t adv;
              uint64_t uladv;

              printf ("  [0x%08tx]", data - start);

              op_code = *data++;

              if (op_code >= linfo.li_opcode_base)
                {
                  op_code -= linfo.li_opcode_base;
                  uladv = (op_code / linfo.li_line_range);
                  if (linfo.li_max_ops_per_insn == 1)
                    {
                      uladv *= linfo.li_min_insn_length;
                      state_machine_regs.address += uladv;
                      if (uladv)
                        state_machine_regs.view = 0;
                      printf (_("  Special opcode %d: "
                                "advance Address by %" PRIu64
                                " to %#" PRIx64 "%s"),
                              op_code, uladv, state_machine_regs.address,
                              verbose_view && uladv
                              ? _(" (reset view)") : "");
                    }
                  else
                    {
                      unsigned addrdelta
                        = ((state_machine_regs.op_index + uladv)
                            / linfo.li_max_ops_per_insn)
                        * linfo.li_min_insn_length;

                      state_machine_regs.address += addrdelta;
                      state_machine_regs.op_index
                        = (state_machine_regs.op_index + uladv)
                        % linfo.li_max_ops_per_insn;
                      if (addrdelta)
                        state_machine_regs.view = 0;
                      printf (_("  Special opcode %d: "
                                "advance Address by %" PRIu64
                                " to %#" PRIx64 "[%d]%s"),
                              op_code, uladv, state_machine_regs.address,
                              state_machine_regs.op_index,
                              verbose_view && addrdelta
                              ? _(" (reset view)") : "");
                    }
                  adv = (op_code % linfo.li_line_range) + linfo.li_line_base;
                  state_machine_regs.line += adv;
                  printf (_(" and Line by %" PRId64 " to %d"),
                          adv, state_machine_regs.line);
                  if (verbose_view || state_machine_regs.view)
                    printf (_(" (view %u)\n"), state_machine_regs.view);
                  else
                    putchar ('\n');
                  state_machine_regs.view++;
                }
              else
                switch (op_code)
                  {
                  case DW_LNS_extended_op:
                    data += process_extended_line_op (data,
                                                      linfo.li_default_is_stmt,
                                                      end);
                    break;

                  case DW_LNS_copy:
                    printf (_("  Copy"));
                    if (verbose_view || state_machine_regs.view)
                      printf (_(" (view %u)\n"), state_machine_regs.view);
                    else
                      putchar ('\n');
                    state_machine_regs.view++;
                    break;

                  case DW_LNS_advance_pc:
                    READ_ULEB (uladv, data, end);
                    if (linfo.li_max_ops_per_insn == 1)
                      {
                        uladv *= linfo.li_min_insn_length;
                        state_machine_regs.address += uladv;
                        if (uladv)
                          state_machine_regs.view = 0;
                        printf (_("  Advance PC by %" PRIu64
                                  " to %#" PRIx64 "%s\n"),
                                uladv, state_machine_regs.address,
                                verbose_view && uladv
                                ? _(" (reset view)") : "");
                      }
                    else
                      {
                        unsigned addrdelta
                          = ((state_machine_regs.op_index + uladv)
                             / linfo.li_max_ops_per_insn)
                          * linfo.li_min_insn_length;
                        state_machine_regs.address
                          += addrdelta;
                        state_machine_regs.op_index
                          = (state_machine_regs.op_index + uladv)
                          % linfo.li_max_ops_per_insn;
                        if (addrdelta)
                          state_machine_regs.view = 0;
                        printf (_("  Advance PC by %" PRIu64
                                  " to %#" PRIx64 "[%d]%s\n"),
                                uladv, state_machine_regs.address,
                                state_machine_regs.op_index,
                                verbose_view && addrdelta
                                ? _(" (reset view)") : "");
                      }
                    break;

                  case DW_LNS_advance_line:
                    READ_SLEB (adv, data, end);
                    state_machine_regs.line += adv;
                    printf (_("  Advance Line by %" PRId64 " to %d\n"),
                            adv, state_machine_regs.line);
                    break;

                  case DW_LNS_set_file:
                    READ_ULEB (uladv, data, end);
                    printf (_("  Set File Name to entry %" PRIu64
                              " in the File Name Table\n"), uladv);
                    state_machine_regs.file = uladv;
                    break;

                  case DW_LNS_set_column:
                    READ_ULEB (uladv, data, end);
                    printf (_("  Set column to %" PRIu64 "\n"), uladv);
                    state_machine_regs.column = uladv;
                    break;

                  case DW_LNS_negate_stmt:
                    adv = state_machine_regs.is_stmt;
                    adv = ! adv;
                    printf (_("  Set is_stmt to %" PRId64 "\n"), adv);
                    state_machine_regs.is_stmt = adv;
                    break;

                  case DW_LNS_set_basic_block:
                    printf (_("  Set basic block\n"));
                    state_machine_regs.basic_block = 1;
                    break;

                  case DW_LNS_const_add_pc:
                    uladv = ((255 - linfo.li_opcode_base) / linfo.li_line_range);
                    if (linfo.li_max_ops_per_insn)
                      {
                        uladv *= linfo.li_min_insn_length;
                        state_machine_regs.address += uladv;
                        if (uladv)
                          state_machine_regs.view = 0;
                        printf (_("  Advance PC by constant %" PRIu64
                                  " to %#" PRIx64 "%s\n"),
                                uladv, state_machine_regs.address,
                                verbose_view && uladv
                                ? _(" (reset view)") : "");
                      }
                    else
                      {
                        unsigned addrdelta
                          = ((state_machine_regs.op_index + uladv)
                             / linfo.li_max_ops_per_insn)
                          * linfo.li_min_insn_length;
                        state_machine_regs.address
                          += addrdelta;
                        state_machine_regs.op_index
                          = (state_machine_regs.op_index + uladv)
                          % linfo.li_max_ops_per_insn;
                        if (addrdelta)
                          state_machine_regs.view = 0;
                        printf (_("  Advance PC by constant %" PRIu64
                                  " to %#" PRIx64 "[%d]%s\n"),
                                uladv, state_machine_regs.address,
                                state_machine_regs.op_index,
                                verbose_view && addrdelta
                                ? _(" (reset view)") : "");
                      }
                    break;

                  case DW_LNS_fixed_advance_pc:
                    SAFE_BYTE_GET_AND_INC (uladv, data, 2, end);
                    state_machine_regs.address += uladv;
                    state_machine_regs.op_index = 0;
                    printf (_("  Advance PC by fixed size amount %" PRIu64
                              " to %#" PRIx64 "\n"),
                            uladv, state_machine_regs.address);
                    /* Do NOT reset view.  */
                    break;

                  case DW_LNS_set_prologue_end:
                    printf (_("  Set prologue_end to true\n"));
                    break;

                  case DW_LNS_set_epilogue_begin:
                    printf (_("  Set epilogue_begin to true\n"));
                    break;

                  case DW_LNS_set_isa:
                    READ_ULEB (uladv, data, end);
                    printf (_("  Set ISA to %" PRIu64 "\n"), uladv);
                    break;

                  default:
                    printf (_("  Unknown opcode %d with operands: "), op_code);

                    if (standard_opcodes != NULL)
                      for (i = standard_opcodes[op_code - 1]; i > 0 ; --i)
                        {
                          READ_ULEB (uladv, data, end);
                          printf ("%#" PRIx64 "%s", uladv, i == 1 ? "" : ", ");
                        }
                    putchar ('\n');
                    break;
                  }
            }
          putchar ('\n');
        }
    }

  return 1;
}

typedef struct
{
  char *name;
  unsigned int directory_index;
  unsigned int modification_date;
  unsigned int length;
} File_Entry;

/* Output a decoded representation of the .debug_line section.  */

static int
display_debug_lines_decoded (struct dwarf_section *  section,
                             unsigned char *         start,
                             unsigned char *         data,
                             unsigned char *         end,
                             void *                  fileptr)
{
  static DWARF2_Internal_LineInfo saved_linfo;

  introduce (section, false);

  while (data < end)
    {
      /* This loop amounts to one iteration per compilation unit.  */
      DWARF2_Internal_LineInfo linfo;
      unsigned char *standard_opcodes;
      unsigned char *end_of_sequence;
      int i;
      File_Entry *file_table = NULL;
      unsigned int n_files = 0;
      char **directory_table = NULL;
      unsigned int n_directories = 0;

      if (startswith (section->name, ".debug_line.")
          /* Note: the following does not apply to .debug_line.dwo sections.
             These are full debug_line sections.  */
          && strcmp (section->name, ".debug_line.dwo") != 0)
        {
          /* See comment in display_debug_lines_raw().  */
          end_of_sequence = end;
          standard_opcodes = NULL;
          linfo = saved_linfo;
          /* PR 17531: file: 0522b371.  */
          if (linfo.li_line_range == 0)
            {
              warn (_("Partial .debug_line. section encountered without a prior full .debug_line section\n"));
              return 0;
            }
          reset_state_machine (linfo.li_default_is_stmt);
        }
      else
        {
          unsigned char *hdrptr;

          if ((hdrptr = read_debug_line_header (section, data, end, & linfo,
                                                & end_of_sequence)) == NULL)
              return 0;

          /* PR 17531: file: 0522b371.  */
          if (linfo.li_line_range == 0)
            {
              warn (_("Line range of 0 is invalid, using 1 instead\n"));
              linfo.li_line_range = 1;
            }
          reset_state_machine (linfo.li_default_is_stmt);

          /* Save a pointer to the contents of the Opcodes table.  */
          standard_opcodes = hdrptr;

          /* Traverse the Directory table just to count entries.  */
          data = standard_opcodes + linfo.li_opcode_base - 1;
          /* PR 20440 */
          if (data >= end)
            {
              warn (_("opcode base of %d extends beyond end of section\n"),
                    linfo.li_opcode_base);
              return 0;
            }

          if (linfo.li_version >= 5)
            {
              unsigned char *format_start, *format;
              unsigned int format_count, formati, entryi;

              load_debug_section_with_follow (line_str, fileptr);

              /* Skip directories format.  */
              SAFE_BYTE_GET_AND_INC (format_count, data, 1, end);
              if (do_checks && format_count > 1)
                warn (_("Unexpectedly large number of columns in the directory name table (%u)\n"),
                      format_count);
              format_start = data;
              for (formati = 0; formati < format_count; formati++)
                {
                  SKIP_ULEB (data, end);
                  SKIP_ULEB (data, end);
                }

              READ_ULEB (n_directories, data, end);
              if (data >= end)
                {
                  warn (_("Corrupt directories list\n"));
                  break;
                }

              if (n_directories == 0)
                directory_table = NULL;
              else
                directory_table = (char **)
                  xcalloc (n_directories, sizeof (unsigned char *));

              for (entryi = 0; entryi < n_directories; entryi++)
                {
                  char **pathp = &directory_table[entryi];

                  format = format_start;
                  for (formati = 0; formati < format_count; formati++)
                    {
                      uint64_t content_type, form;
                      uint64_t uvalue;

                      READ_ULEB (content_type, format, end);
                      READ_ULEB (form, format, end);
                      if (data >= end)
                        {
                          warn (_("Corrupt directories list\n"));
                          break;
                        }
                      switch (content_type)
                        {
                        case DW_LNCT_path:
                          switch (form)
                            {
                            case DW_FORM_string:
                              *pathp = (char *) data;
                              break;
                            case DW_FORM_line_strp:
                              SAFE_BYTE_GET (uvalue, data, linfo.li_offset_size,
                                             end);
                              /* Remove const by the cast.  */
                              *pathp = (char *)
                                       fetch_indirect_line_string (uvalue);
                              break;
                            }
                          break;
                        }
                      data = read_and_display_attr_value (0, form, 0, start,
                                                          data, end, 0, 0,
                                                          linfo.li_offset_size,
                                                          linfo.li_version,
                                                          NULL, 1, section,
                                                          NULL, '\t', -1);
                    }
                  if (data >= end)
                    {
                      warn (_("Corrupt directories list\n"));
                      break;
                    }
                }

              /* Skip files format.  */
              SAFE_BYTE_GET_AND_INC (format_count, data, 1, end);
              if (do_checks && format_count > 5)
                warn (_("Unexpectedly large number of columns in the file name table (%u)\n"),
                      format_count);
              format_start = data;
              for (formati = 0; formati < format_count; formati++)
                {
                  SKIP_ULEB (data, end);
                  SKIP_ULEB (data, end);
                }

              READ_ULEB (n_files, data, end);
              if (data >= end && n_files > 0)
                {
                  warn (_("Corrupt file name list\n"));
                  break;
                }

              if (n_files == 0)
                file_table = NULL;
              else
                file_table = (File_Entry *) xcalloc (n_files,
                                                     sizeof (File_Entry));

              for (entryi = 0; entryi < n_files; entryi++)
                {
                  File_Entry *file = &file_table[entryi];

                  format = format_start;
                  for (formati = 0; formati < format_count; formati++)
                    {
                      uint64_t content_type, form;
                      uint64_t uvalue;
                      unsigned char *tmp;

                      READ_ULEB (content_type, format, end);
                      READ_ULEB (form, format, end);
                      if (data >= end)
                        {
                          warn (_("Corrupt file name list\n"));
                          break;
                        }
                      switch (content_type)
                        {
                        case DW_LNCT_path:
                          switch (form)
                            {
                            case DW_FORM_string:
                              file->name = (char *) data;
                              break;
                            case DW_FORM_line_strp:
                              SAFE_BYTE_GET (uvalue, data, linfo.li_offset_size,
                                             end);
                              /* Remove const by the cast.  */
                              file->name = (char *)
                                           fetch_indirect_line_string (uvalue);
                              break;
                            }
                          break;
                        case DW_LNCT_directory_index:
                          switch (form)
                            {
                            case DW_FORM_data1:
                              SAFE_BYTE_GET (file->directory_index, data, 1,
                                             end);
                              break;
                            case DW_FORM_data2:
                              SAFE_BYTE_GET (file->directory_index, data, 2,
                                             end);
                              break;
                            case DW_FORM_udata:
                              tmp = data;
                              READ_ULEB (file->directory_index, tmp, end);
                              break;
                            }
                          break;
                        }
                      data = read_and_display_attr_value (0, form, 0, start,
                                                          data, end, 0, 0,
                                                          linfo.li_offset_size,
                                                          linfo.li_version,
                                                          NULL, 1, section,
                                                          NULL, '\t', -1);
                    }
                  if (data >= end)
                    {
                      warn (_("Corrupt file name list\n"));
                      break;
                    }
                }
            }
          else
            {
              if (*data != 0)
                {
                  char *ptr_directory_table = (char *) data;

                  while (data < end && *data != 0)
                    {
                      data += strnlen ((char *) data, end - data);
                      if (data < end)
                        data++;
                      n_directories++;
                    }

                  /* PR 20440 */
                  if (data >= end)
                    {
                      warn (_("directory table ends unexpectedly\n"));
                      n_directories = 0;
                      break;
                    }

                  /* Go through the directory table again to save the directories.  */
                  directory_table = (char **)
                    xmalloc (n_directories * sizeof (unsigned char *));

                  i = 0;
                  while (*ptr_directory_table != 0)
                    {
                      directory_table[i] = ptr_directory_table;
                      ptr_directory_table += strlen (ptr_directory_table) + 1;
                      i++;
                    }
                }
              /* Skip the NUL at the end of the table.  */
              data++;

              /* Traverse the File Name table just to count the entries.  */
              if (data < end && *data != 0)
                {
                  unsigned char *ptr_file_name_table = data;

                  while (data < end && *data != 0)
                    {
                      /* Skip Name, directory index, last modification
                         time and length of file.  */
                      data += strnlen ((char *) data, end - data);
                      if (data < end)
                        data++;
                      SKIP_ULEB (data, end);
                      SKIP_ULEB (data, end);
                      SKIP_ULEB (data, end);
                      n_files++;
                    }

                  if (data >= end)
                    {
                      warn (_("file table ends unexpectedly\n"));
                      n_files = 0;
                      break;
                    }

                  /* Go through the file table again to save the strings.  */
                  file_table = (File_Entry *) xmalloc (n_files * sizeof (File_Entry));

                  i = 0;
                  while (*ptr_file_name_table != 0)
                    {
                      file_table[i].name = (char *) ptr_file_name_table;
                      ptr_file_name_table
                        += strlen ((char *) ptr_file_name_table) + 1;

                      /* We are not interested in directory, time or size.  */
                      READ_ULEB (file_table[i].directory_index,
                                 ptr_file_name_table, end);
                      READ_ULEB (file_table[i].modification_date,
                                 ptr_file_name_table, end);
                      READ_ULEB (file_table[i].length,
                                 ptr_file_name_table, end);
                      i++;
                    }
                  i = 0;
                }

              /* Skip the NUL at the end of the table.  */
              data++;
            }

          /* Print the Compilation Unit's name and a header.  */
          if (file_table == NULL)
            printf (_("CU: No directory table\n"));
          else if (directory_table == NULL)
            printf (_("CU: %s:\n"), null_name (file_table[0].name));
          else
            {
              unsigned int ix = file_table[0].directory_index;
              const char *directory;

              if (ix == 0 && linfo.li_version < 5)
                directory = ".";
              /* PR 20439 */
              else if (n_directories == 0)
                directory = _("<unknown>");
              else
                {
                  if (linfo.li_version < 5)
                    --ix;
                  if (ix >= n_directories)
                    {
                      warn (_("directory index %u "
                              ">= number of directories %u\n"),
                            ix, n_directories);
                      directory = _("<corrupt>");
                    }
                  else
                    directory = directory_table[ix];
                }
              if (do_wide)
                printf (_("CU: %s/%s:\n"),
                        null_name (directory),
                        null_name (file_table[0].name));
              else
                printf ("%s:\n", null_name (file_table[0].name));
            }

          if (n_files > 0)
            printf (_("File name                            Line number    Starting address    View    Stmt\n"));
          else
            printf (_("CU: Empty file name table\n"));
          saved_linfo = linfo;
        }

      /* This loop iterates through the Dwarf Line Number Program.  */
      while (data < end_of_sequence)
        {
          unsigned char op_code;
          int xop;
          int adv;
          unsigned long int uladv;
          int is_special_opcode = 0;

          op_code = *data++;
          xop = op_code;

          if (op_code >= linfo.li_opcode_base)
            {
              op_code -= linfo.li_opcode_base;
              uladv = (op_code / linfo.li_line_range);
              if (linfo.li_max_ops_per_insn == 1)
                {
                  uladv *= linfo.li_min_insn_length;
                  state_machine_regs.address += uladv;
                  if (uladv)
                    state_machine_regs.view = 0;
                }
              else
                {
                  unsigned addrdelta
                    = ((state_machine_regs.op_index + uladv)
                       / linfo.li_max_ops_per_insn)
                    * linfo.li_min_insn_length;
                  state_machine_regs.address
                    += addrdelta;
                  state_machine_regs.op_index
                    = (state_machine_regs.op_index + uladv)
                    % linfo.li_max_ops_per_insn;
                  if (addrdelta)
                    state_machine_regs.view = 0;
                }

              adv = (op_code % linfo.li_line_range) + linfo.li_line_base;
              state_machine_regs.line += adv;
              is_special_opcode = 1;
              /* Increment view after printing this row.  */
            }
          else
            switch (op_code)
              {
              case DW_LNS_extended_op:
                {
                  unsigned int ext_op_code_len;
                  unsigned char ext_op_code;
                  unsigned char *op_code_end;
                  unsigned char *op_code_data = data;

                  READ_ULEB (ext_op_code_len, op_code_data, end_of_sequence);
                  op_code_end = op_code_data + ext_op_code_len;
                  if (ext_op_code_len == 0 || op_code_end > end_of_sequence)
                    {
                      warn (_("Badly formed extended line op encountered!\n"));
                      break;
                    }
                  ext_op_code = *op_code_data++;
                  xop = ext_op_code;
                  xop = -xop;

                  switch (ext_op_code)
                    {
                    case DW_LNE_end_sequence:
                      /* Reset stuff after printing this row.  */
                      break;
                    case DW_LNE_set_address:
                      SAFE_BYTE_GET_AND_INC (state_machine_regs.address,
                                             op_code_data,
                                             op_code_end - op_code_data,
                                             op_code_end);
                      state_machine_regs.op_index = 0;
                      state_machine_regs.view = 0;
                      break;
                    case DW_LNE_define_file:
                      file_table = (File_Entry *) xrealloc
                        (file_table, (n_files + 1) * sizeof (File_Entry));

                      ++state_machine_regs.last_file_entry;
                      /* Source file name.  */
                      file_table[n_files].name = (char *) op_code_data;
                      op_code_data += strlen ((char *) op_code_data) + 1;
                      /* Directory index.  */
                      READ_ULEB (file_table[n_files].directory_index,
                                 op_code_data, op_code_end);
                      /* Last modification time.  */
                      READ_ULEB (file_table[n_files].modification_date,
                                 op_code_data, op_code_end);
                      /* File length.  */
                      READ_ULEB (file_table[n_files].length,
                                 op_code_data, op_code_end);
                      n_files++;
                      break;

                    case DW_LNE_set_discriminator:
                    case DW_LNE_HP_set_sequence:
                      /* Simply ignored.  */
                      break;

                    default:
                      printf (_("UNKNOWN (%u): length %ld\n"),
                              ext_op_code, (long int) (op_code_data - data));
                      break;
                    }
                  data = op_code_end;
                  break;
                }
              case DW_LNS_copy:
                /* Increment view after printing this row.  */
                break;

              case DW_LNS_advance_pc:
                READ_ULEB (uladv, data, end);
                if (linfo.li_max_ops_per_insn == 1)
                  {
                    uladv *= linfo.li_min_insn_length;
                    state_machine_regs.address += uladv;
                    if (uladv)
                      state_machine_regs.view = 0;
                  }
                else
                  {
                    unsigned addrdelta
                      = ((state_machine_regs.op_index + uladv)
                         / linfo.li_max_ops_per_insn)
                      * linfo.li_min_insn_length;
                    state_machine_regs.address
                      += addrdelta;
                    state_machine_regs.op_index
                      = (state_machine_regs.op_index + uladv)
                      % linfo.li_max_ops_per_insn;
                    if (addrdelta)
                      state_machine_regs.view = 0;
                  }
                break;

              case DW_LNS_advance_line:
                READ_SLEB (adv, data, end);
                state_machine_regs.line += adv;
                break;

              case DW_LNS_set_file:
                READ_ULEB (uladv, data, end);
                state_machine_regs.file = uladv;

                unsigned file = state_machine_regs.file;
                if (linfo.li_version < 5)
                  --file;

                if (file_table == NULL || n_files == 0)
                  printf (_("\n [Use file table entry %d]\n"), file);
                /* PR 20439 */
                else if (file >= n_files)
                  {
                    warn (_("file index %u >= number of files %u\n"),
                          file, n_files);
                    printf (_("\n <over large file table index %u>"), file);
                  }
                else
                  {
                    unsigned dir = file_table[file].directory_index;
                    if (dir == 0 && linfo.li_version < 5)
                      /* If directory index is 0, that means compilation
                         current directory.  bfd/dwarf2.c shows
                         DW_AT_comp_dir here but in keeping with the
                         readelf practice of minimal interpretation of
                         file data, we show "./".  */
                      printf ("\n./%s:[++]\n",
                              null_name (file_table[file].name));
                    else if (directory_table == NULL || n_directories == 0)
                      printf (_("\n [Use file %s "
                                "in directory table entry %d]\n"),
                              null_name (file_table[file].name), dir);
                    else
                      {
                        if (linfo.li_version < 5)
                          --dir;
                        /* PR 20439 */
                        if (dir >= n_directories)
                          {
                            warn (_("directory index %u "
                                    ">= number of directories %u\n"),
                                  dir, n_directories);
                            printf (_("\n <over large directory table entry "
                                      "%u>\n"), dir);
                          }
                        else
                          printf ("\n%s/%s:\n",
                                  null_name (directory_table[dir]),
                                  null_name (file_table[file].name));
                      }
                  }
                break;

              case DW_LNS_set_column:
                READ_ULEB (uladv, data, end);
                state_machine_regs.column = uladv;
                break;

              case DW_LNS_negate_stmt:
                adv = state_machine_regs.is_stmt;
                adv = ! adv;
                state_machine_regs.is_stmt = adv;
                break;

              case DW_LNS_set_basic_block:
                state_machine_regs.basic_block = 1;
                break;

              case DW_LNS_const_add_pc:
                uladv = ((255 - linfo.li_opcode_base) / linfo.li_line_range);
                if (linfo.li_max_ops_per_insn == 1)
                  {
                    uladv *= linfo.li_min_insn_length;
                    state_machine_regs.address += uladv;
                    if (uladv)
                      state_machine_regs.view = 0;
                  }
                else
                  {
                    unsigned addrdelta
                      = ((state_machine_regs.op_index + uladv)
                         / linfo.li_max_ops_per_insn)
                      * linfo.li_min_insn_length;
                    state_machine_regs.address
                      += addrdelta;
                    state_machine_regs.op_index
                      = (state_machine_regs.op_index + uladv)
                      % linfo.li_max_ops_per_insn;
                    if (addrdelta)
                      state_machine_regs.view = 0;
                  }
                break;

              case DW_LNS_fixed_advance_pc:
                SAFE_BYTE_GET_AND_INC (uladv, data, 2, end);
                state_machine_regs.address += uladv;
                state_machine_regs.op_index = 0;
                /* Do NOT reset view.  */
                break;

              case DW_LNS_set_prologue_end:
                break;

              case DW_LNS_set_epilogue_begin:
                break;

              case DW_LNS_set_isa:
                READ_ULEB (uladv, data, end);
                printf (_("  Set ISA to %lu\n"), uladv);
                break;

              default:
                printf (_("  Unknown opcode %d with operands: "), op_code);

                if (standard_opcodes != NULL)
                  for (i = standard_opcodes[op_code - 1]; i > 0 ; --i)
                    {
                      uint64_t val;

                      READ_ULEB (val, data, end);
                      printf ("%#" PRIx64 "%s", val, i == 1 ? "" : ", ");
                    }
                putchar ('\n');
                break;
              }

          /* Only Special opcodes, DW_LNS_copy and DW_LNE_end_sequence adds a row
             to the DWARF address/line matrix.  */
          if ((is_special_opcode) || (xop == -DW_LNE_end_sequence)
              || (xop == DW_LNS_copy))
            {
              const unsigned int MAX_FILENAME_LENGTH = 35;
              char *fileName = NULL;
              char *newFileName = NULL;
              size_t fileNameLength;

              if (file_table)
                {
                  unsigned indx = state_machine_regs.file;

                  if (linfo.li_version < 5)
                    --indx;
                  /* PR 20439  */
                  if (indx >= n_files)
                    {
                      warn (_("file index %u >= number of files %u\n"),
                            indx, n_files);
                      fileName = _("<corrupt>");
                    }
                  else
                    fileName = (char *) file_table[indx].name;
                }
              if (!fileName)
                fileName = _("<unknown>");

              fileNameLength = strlen (fileName);
              newFileName = fileName;
              if (fileNameLength > MAX_FILENAME_LENGTH && !do_wide)
                {
                  newFileName = (char *) xmalloc (MAX_FILENAME_LENGTH + 1);
                  /* Truncate file name */
                  memcpy (newFileName,
                          fileName + fileNameLength - MAX_FILENAME_LENGTH,
                          MAX_FILENAME_LENGTH);
                  newFileName[MAX_FILENAME_LENGTH] = 0;
                }

              /* A row with end_seq set to true has a meaningful address, but
                 the other information in the same row is not significant.
                 In such a row, print line as "-", and don't print
                 view/is_stmt.  */
              if (!do_wide || fileNameLength <= MAX_FILENAME_LENGTH)
                {
                  if (linfo.li_max_ops_per_insn == 1)
                    {
                      if (xop == -DW_LNE_end_sequence)
                        printf ("%-35s  %11s  %#18" PRIx64,
                                newFileName, "-",
                                state_machine_regs.address);
                      else
                        printf ("%-35s  %11d  %#18" PRIx64,
                                newFileName, state_machine_regs.line,
                                state_machine_regs.address);
                    }
                  else
                    {
                      if (xop == -DW_LNE_end_sequence)
                        printf ("%-35s  %11s  %#18" PRIx64 "[%d]",
                                newFileName, "-",
                                state_machine_regs.address,
                                state_machine_regs.op_index);
                      else
                        printf ("%-35s  %11d  %#18" PRIx64 "[%d]",
                                newFileName, state_machine_regs.line,
                                state_machine_regs.address,
                                state_machine_regs.op_index);
                    }
                }
              else
                {
                  if (linfo.li_max_ops_per_insn == 1)
                    {
                      if (xop == -DW_LNE_end_sequence)
                        printf ("%s  %11s  %#18" PRIx64,
                                newFileName, "-",
                                state_machine_regs.address);
                      else
                        printf ("%s  %11d  %#18" PRIx64,
                                newFileName, state_machine_regs.line,
                                state_machine_regs.address);
                    }
                  else
                    {
                      if (xop == -DW_LNE_end_sequence)
                        printf ("%s  %11s  %#18" PRIx64 "[%d]",
                                newFileName, "-",
                                state_machine_regs.address,
                                state_machine_regs.op_index);
                      else
                        printf ("%s  %11d  %#18" PRIx64 "[%d]",
                                newFileName, state_machine_regs.line,
                                state_machine_regs.address,
                                state_machine_regs.op_index);
                    }
                }

              if (xop != -DW_LNE_end_sequence)
                {
                  if (state_machine_regs.view)
                    printf ("  %6u", state_machine_regs.view);
                  else
                    printf ("        ");

                  if (state_machine_regs.is_stmt)
                    printf ("       x");
                }

              putchar ('\n');
              state_machine_regs.view++;

              if (xop == -DW_LNE_end_sequence)
                {
                  reset_state_machine (linfo.li_default_is_stmt);
                  putchar ('\n');
                }

              if (newFileName != fileName)
                free (newFileName);
            }
        }

      if (file_table)
        {
          free (file_table);
          file_table = NULL;
          n_files = 0;
        }

      if (directory_table)
        {
          free (directory_table);
          directory_table = NULL;
          n_directories = 0;
        }

      putchar ('\n');
    }

  return 1;
}

static int
display_debug_lines (struct dwarf_section *section, void *file)
{
  unsigned char *data = section->start;
  unsigned char *end = data + section->size;
  int retValRaw = 1;
  int retValDecoded = 1;

  if (do_debug_lines == 0)
    do_debug_lines |= FLAG_DEBUG_LINES_RAW;

  if (do_debug_lines & FLAG_DEBUG_LINES_RAW)
    retValRaw = display_debug_lines_raw (section, data, end, file);

  if (do_debug_lines & FLAG_DEBUG_LINES_DECODED)
    retValDecoded = display_debug_lines_decoded (section, data, data, end, file);

  if (!retValRaw || !retValDecoded)
    return 0;

  return 1;
}

static debug_info *
find_debug_info_for_offset (uint64_t offset)
{
  unsigned int i;

  if (num_debug_info_entries == DEBUG_INFO_UNAVAILABLE)
    return NULL;

  for (i = 0; i < num_debug_info_entries; i++)
    if (debug_information[i].cu_offset == offset)
      return debug_information + i;

  return NULL;
}

static const char *
get_gdb_index_symbol_kind_name (gdb_index_symbol_kind kind)
{
  /* See gdb/gdb-index.h.  */
  static const char * const kinds[] =
  {
    N_ ("no info"),
    N_ ("type"),
    N_ ("variable"),
    N_ ("function"),
    N_ ("other"),
    N_ ("unused5"),
    N_ ("unused6"),
    N_ ("unused7")
  };

  return _ (kinds[kind]);
}

static int
display_debug_pubnames_worker (struct dwarf_section *section,
                               void *file ATTRIBUTE_UNUSED,
                               int is_gnu)
{
  DWARF2_Internal_PubNames names;
  unsigned char *start = section->start;
  unsigned char *end = start + section->size;

  /* It does not matter if this load fails,
     we test for that later on.  */
  load_debug_info (file);

  introduce (section, false);

  while (start < end)
    {
      unsigned char *data;
      unsigned long sec_off = start - section->start;
      unsigned int offset_size;

      SAFE_BYTE_GET_AND_INC (names.pn_length, start, 4, end);
      if (names.pn_length == 0xffffffff)
        {
          SAFE_BYTE_GET_AND_INC (names.pn_length, start, 8, end);
          offset_size = 8;
        }
      else
        offset_size = 4;

      if (names.pn_length > (size_t) (end - start))
        {
          warn (_("Debug info is corrupted, "
                  "%s header at %#lx has length %#" PRIx64 "\n"),
                section->name, sec_off, names.pn_length);
          break;
        }

      data = start;
      start += names.pn_length;

      SAFE_BYTE_GET_AND_INC (names.pn_version, data, 2, start);
      SAFE_BYTE_GET_AND_INC (names.pn_offset, data, offset_size, start);

      if (num_debug_info_entries != DEBUG_INFO_UNAVAILABLE
          && num_debug_info_entries > 0
          && find_debug_info_for_offset (names.pn_offset) == NULL)
        warn (_(".debug_info offset of %#" PRIx64
                " in %s section does not point to a CU header.\n"),
              names.pn_offset, section->name);

      SAFE_BYTE_GET_AND_INC (names.pn_size, data, offset_size, start);

      printf (_("  Length:                              %" PRId64 "\n"),
              names.pn_length);
      printf (_("  Version:                             %d\n"),
              names.pn_version);
      printf (_("  Offset into .debug_info section:     %#" PRIx64 "\n"),
              names.pn_offset);
      printf (_("  Size of area in .debug_info section: %" PRId64 "\n"),
              names.pn_size);

      if (names.pn_version != 2 && names.pn_version != 3)
        {
          static int warned = 0;

          if (! warned)
            {
              warn (_("Only DWARF 2 and 3 pubnames are currently supported\n"));
              warned = 1;
            }

          continue;
        }

      if (is_gnu)
        printf (_("\n    Offset  Kind          Name\n"));
      else
        printf (_("\n    Offset\tName\n"));

      while (1)
        {
          size_t maxprint;
          uint64_t offset;

          SAFE_BYTE_GET_AND_INC (offset, data, offset_size, start);

          if (offset == 0)
            break;

          if (data >= start)
            break;
          maxprint = (start - data) - 1;

          if (is_gnu)
            {
              unsigned int kind_data;
              gdb_index_symbol_kind kind;
              const char *kind_name;
              int is_static;

              SAFE_BYTE_GET_AND_INC (kind_data, data, 1, start);
              maxprint --;
              /* GCC computes the kind as the upper byte in the CU index
                 word, and then right shifts it by the CU index size.
                 Left shift KIND to where the gdb-index.h accessor macros
                 can use it.  */
              kind_data <<= GDB_INDEX_CU_BITSIZE;
              kind = GDB_INDEX_SYMBOL_KIND_VALUE (kind_data);
              kind_name = get_gdb_index_symbol_kind_name (kind);
              is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (kind_data);
              printf ("    %-6" PRIx64 "  %s,%-10s  %.*s\n",
                      offset, is_static ? _("s") : _("g"),
                      kind_name, (int) maxprint, data);
            }
          else
            printf ("    %-6" PRIx64 "\t%.*s\n",
                    offset, (int) maxprint, data);

          data += strnlen ((char *) data, maxprint);
          if (data < start)
            data++;
          if (data >= start)
            break;
        }
    }

  printf ("\n");
  return 1;
}

static int
display_debug_pubnames (struct dwarf_section *section, void *file)
{
  return display_debug_pubnames_worker (section, file, 0);
}

static int
display_debug_gnu_pubnames (struct dwarf_section *section, void *file)
{
  return display_debug_pubnames_worker (section, file, 1);
}

static int
display_debug_macinfo (struct dwarf_section *section,
                       void *file ATTRIBUTE_UNUSED)
{
  unsigned char *start = section->start;
  unsigned char *end = start + section->size;
  unsigned char *curr = start;
  enum dwarf_macinfo_record_type op;

  introduce (section, false);

  while (curr < end)
    {
      unsigned int lineno;
      const unsigned char *string;

      op = (enum dwarf_macinfo_record_type) *curr;
      curr++;

      switch (op)
        {
        case DW_MACINFO_start_file:
          {
            unsigned int filenum;

            READ_ULEB (lineno, curr, end);
            READ_ULEB (filenum, curr, end);
            printf (_(" DW_MACINFO_start_file - lineno: %d filenum: %d\n"),
                    lineno, filenum);
          }
          break;

        case DW_MACINFO_end_file:
          printf (_(" DW_MACINFO_end_file\n"));
          break;

        case DW_MACINFO_define:
          READ_ULEB (lineno, curr, end);
          string = curr;
          curr += strnlen ((char *) string, end - string);
          printf (_(" DW_MACINFO_define - lineno : %d macro : %*s\n"),
                  lineno, (int) (curr - string), string);
          if (curr < end)
            curr++;
          break;

        case DW_MACINFO_undef:
          READ_ULEB (lineno, curr, end);
          string = curr;
          curr += strnlen ((char *) string, end - string);
          printf (_(" DW_MACINFO_undef - lineno : %d macro : %*s\n"),
                  lineno, (int) (curr - string), string);
          if (curr < end)
            curr++;
          break;

        case DW_MACINFO_vendor_ext:
          {
            unsigned int constant;

            READ_ULEB (constant, curr, end);
            string = curr;
            curr += strnlen ((char *) string, end - string);
            printf (_(" DW_MACINFO_vendor_ext - constant : %d string : %*s\n"),
                    constant, (int) (curr - string), string);
            if (curr < end)
              curr++;
          }
          break;
        }
    }

  return 1;
}

/* Given LINE_OFFSET into the .debug_line section, attempt to return
   filename and dirname corresponding to file name table entry with index
   FILEIDX.  Return NULL on failure.  */

static unsigned char *
get_line_filename_and_dirname (uint64_t line_offset,
                               uint64_t fileidx,
                               unsigned char **dir_name)
{
  struct dwarf_section *section = &debug_displays [line].section;
  unsigned char *hdrptr, *dirtable, *file_name;
  unsigned int offset_size;
  unsigned int version, opcode_base;
  uint64_t length, diridx;
  const unsigned char * end;

  *dir_name = NULL;
  if (section->start == NULL
      || line_offset >= section->size
      || fileidx == 0)
    return NULL;

  hdrptr = section->start + line_offset;
  end = section->start + section->size;

  SAFE_BYTE_GET_AND_INC (length, hdrptr, 4, end);
  if (length == 0xffffffff)
    {
      /* This section is 64-bit DWARF 3.  */
      SAFE_BYTE_GET_AND_INC (length, hdrptr, 8, end);
      offset_size = 8;
    }
  else
    offset_size = 4;

  if (length > (size_t) (end - hdrptr)
      || length < 2 + offset_size + 1 + 3 + 1)
    return NULL;
  end = hdrptr + length;

  SAFE_BYTE_GET_AND_INC (version, hdrptr, 2, end);
  if (version != 2 && version != 3 && version != 4)
    return NULL;
  hdrptr += offset_size + 1;/* Skip prologue_length and min_insn_length.  */
  if (version >= 4)
    hdrptr++;               /* Skip max_ops_per_insn.  */
  hdrptr += 3;              /* Skip default_is_stmt, line_base, line_range.  */

  SAFE_BYTE_GET_AND_INC (opcode_base, hdrptr, 1, end);
  if (opcode_base == 0
      || opcode_base - 1 >= (size_t) (end - hdrptr))
    return NULL;

  hdrptr += opcode_base - 1;

  dirtable = hdrptr;
  /* Skip over dirname table.  */
  while (*hdrptr != '\0')
    {
      hdrptr += strnlen ((char *) hdrptr, end - hdrptr);
      if (hdrptr < end)
        hdrptr++;
      if (hdrptr >= end)
        return NULL;
    }
  hdrptr++;                 /* Skip the NUL at the end of the table.  */

  /* Now skip over preceding filename table entries.  */
  for (; hdrptr < end && *hdrptr != '\0' && fileidx > 1; fileidx--)
    {
      hdrptr += strnlen ((char *) hdrptr, end - hdrptr);
      if (hdrptr < end)
        hdrptr++;
      SKIP_ULEB (hdrptr, end);
      SKIP_ULEB (hdrptr, end);
      SKIP_ULEB (hdrptr, end);
    }
  if (hdrptr >= end || *hdrptr == '\0')
    return NULL;

  file_name = hdrptr;
  hdrptr += strnlen ((char *) hdrptr, end - hdrptr);
  if (hdrptr < end)
    hdrptr++;
  if (hdrptr >= end)
    return NULL;
  READ_ULEB (diridx, hdrptr, end);
  if (diridx == 0)
    return file_name;
  for (; dirtable < end && *dirtable != '\0' && diridx > 1; diridx--)
    {
      dirtable += strnlen ((char *) dirtable, end - dirtable);
      if (dirtable < end)
        dirtable++;
    }
  if (dirtable >= end || *dirtable == '\0')
    return NULL;
  *dir_name = dirtable;
  return file_name;
}

static int
display_debug_macro (struct dwarf_section *section,
                     void *file)
{
  unsigned char *start = section->start;
  unsigned char *end = start + section->size;
  unsigned char *curr = start;
  unsigned char *extended_op_buf[256];
  bool is_dwo = false;
  const char *suffix = strrchr (section->name, '.');

  if (suffix && strcmp (suffix, ".dwo") == 0)
    is_dwo = true;

  load_debug_section_with_follow (str, file);
  load_debug_section_with_follow (line, file);
  load_debug_section_with_follow (str_index, file);

  introduce (section, false);

  while (curr < end)
    {
      unsigned int lineno, version, flags;
      unsigned int offset_size;
      const unsigned char *string;
      uint64_t line_offset = 0, sec_offset = curr - start, offset;
      unsigned char **extended_ops = NULL;

      SAFE_BYTE_GET_AND_INC (version, curr, 2, end);
      if (version != 4 && version != 5)
        {
          error (_("Expected to find a version number of 4 or 5 in section %s but found %d instead\n"),
                 section->name, version);
          return 0;
        }

      SAFE_BYTE_GET_AND_INC (flags, curr, 1, end);
      offset_size = (flags & 1) ? 8 : 4;
      printf (_("  Offset:                      %#" PRIx64 "\n"), sec_offset);
      printf (_("  Version:                     %d\n"), version);
      printf (_("  Offset size:                 %d\n"), offset_size);
      if (flags & 2)
        {
          SAFE_BYTE_GET_AND_INC (line_offset, curr, offset_size, end);
          printf (_("  Offset into .debug_line:     %#" PRIx64 "\n"),
                  line_offset);
        }
      if (flags & 4)
        {
          unsigned int i, count, op;
          uint64_t nargs, n;

          SAFE_BYTE_GET_AND_INC (count, curr, 1, end);

          memset (extended_op_buf, 0, sizeof (extended_op_buf));
          extended_ops = extended_op_buf;
          if (count)
            {
              printf (_("  Extension opcode arguments:\n"));
              for (i = 0; i < count; i++)
                {
                  SAFE_BYTE_GET_AND_INC (op, curr, 1, end);
                  extended_ops[op] = curr;
                  READ_ULEB (nargs, curr, end);
                  if (nargs == 0)
                    printf (_("    DW_MACRO_%02x has no arguments\n"), op);
                  else
                    {
                      printf (_("    DW_MACRO_%02x arguments: "), op);
                      for (n = 0; n < nargs; n++)
                        {
                          unsigned int form;

                          SAFE_BYTE_GET_AND_INC (form, curr, 1, end);
                          printf ("%s%s", get_FORM_name (form),
                                  n == nargs - 1 ? "\n" : ", ");
                          switch (form)
                            {
                            case DW_FORM_data1:
                            case DW_FORM_data2:
                            case DW_FORM_data4:
                            case DW_FORM_data8:
                            case DW_FORM_sdata:
                            case DW_FORM_udata:
                            case DW_FORM_block:
                            case DW_FORM_block1:
                            case DW_FORM_block2:
                            case DW_FORM_block4:
                            case DW_FORM_flag:
                            case DW_FORM_string:
                            case DW_FORM_strp:
                            case DW_FORM_sec_offset:
                              break;
                            default:
                              error (_("Invalid extension opcode form %s\n"),
                                     get_FORM_name (form));
                              return 0;
                            }
                        }
                    }
                }
            }
        }
      printf ("\n");

      while (1)
        {
          unsigned int op;

          if (curr >= end)
            {
              error (_(".debug_macro section not zero terminated\n"));
              return 0;
            }

          SAFE_BYTE_GET_AND_INC (op, curr, 1, end);
          if (op == 0)
            break;

          switch (op)
            {
            case DW_MACRO_define:
              READ_ULEB (lineno, curr, end);
              string = curr;
              curr += strnlen ((char *) string, end - string);
              printf (_(" DW_MACRO_define - lineno : %d macro : %*s\n"),
                      lineno, (int) (curr - string), string);
              if (curr < end)
                curr++;
              break;

            case DW_MACRO_undef:
              READ_ULEB (lineno, curr, end);
              string = curr;
              curr += strnlen ((char *) string, end - string);
              printf (_(" DW_MACRO_undef - lineno : %d macro : %*s\n"),
                      lineno, (int) (curr - string), string);
              if (curr < end)
                curr++;
              break;

            case DW_MACRO_start_file:
              {
                unsigned int filenum;
                unsigned char *file_name = NULL, *dir_name = NULL;

                READ_ULEB (lineno, curr, end);
                READ_ULEB (filenum, curr, end);

                if ((flags & 2) == 0)
                  error (_("DW_MACRO_start_file used, but no .debug_line offset provided.\n"));
                else
                  file_name
                    = get_line_filename_and_dirname (line_offset, filenum,
                                                     &dir_name);
                if (file_name == NULL)
                  printf (_(" DW_MACRO_start_file - lineno: %d filenum: %d\n"),
                          lineno, filenum);
                else
                  printf (_(" DW_MACRO_start_file - lineno: %d filenum: %d filename: %s%s%s\n"),
                          lineno, filenum,
                          dir_name != NULL ? (const char *) dir_name : "",
                          dir_name != NULL ? "/" : "", file_name);
              }
              break;

            case DW_MACRO_end_file:
              printf (_(" DW_MACRO_end_file\n"));
              break;

            case DW_MACRO_define_strp:
              READ_ULEB (lineno, curr, end);
              if (version == 4 && is_dwo)
                READ_ULEB (offset, curr, end);
              else
                SAFE_BYTE_GET_AND_INC (offset, curr, offset_size, end);
              string = fetch_indirect_string (offset);
              printf (_(" DW_MACRO_define_strp - lineno : %d macro : %s\n"),
                      lineno, string);
              break;

            case DW_MACRO_undef_strp:
              READ_ULEB (lineno, curr, end);
              if (version == 4 && is_dwo)
                READ_ULEB (offset, curr, end);
              else
                SAFE_BYTE_GET_AND_INC (offset, curr, offset_size, end);
              string = fetch_indirect_string (offset);
              printf (_(" DW_MACRO_undef_strp - lineno : %d macro : %s\n"),
                      lineno, string);
              break;

            case DW_MACRO_import:
              SAFE_BYTE_GET_AND_INC (offset, curr, offset_size, end);
              printf (_(" DW_MACRO_import - offset : %#" PRIx64 "\n"),
                      offset);
              break;

            case DW_MACRO_define_sup:
              READ_ULEB (lineno, curr, end);
              SAFE_BYTE_GET_AND_INC (offset, curr, offset_size, end);
              printf (_(" DW_MACRO_define_sup - lineno : %d"
                        " macro offset : %#" PRIx64 "\n"),
                      lineno, offset);
              break;

            case DW_MACRO_undef_sup:
              READ_ULEB (lineno, curr, end);
              SAFE_BYTE_GET_AND_INC (offset, curr, offset_size, end);
              printf (_(" DW_MACRO_undef_sup - lineno : %d"
                        " macro offset : %#" PRIx64 "\n"),
                      lineno, offset);
              break;

            case DW_MACRO_import_sup:
              SAFE_BYTE_GET_AND_INC (offset, curr, offset_size, end);
              printf (_(" DW_MACRO_import_sup - offset : %#" PRIx64 "\n"),
                      offset);
              break;

            case DW_MACRO_define_strx:
            case DW_MACRO_undef_strx:
              READ_ULEB (lineno, curr, end);
              READ_ULEB (offset, curr, end);
              string = (const unsigned char *)
                fetch_indexed_string (offset, NULL, offset_size, false, 0);
              if (op == DW_MACRO_define_strx)
                printf (" DW_MACRO_define_strx ");
              else
                printf (" DW_MACRO_undef_strx ");
              if (do_wide)
                printf (_("(with offset %#" PRIx64 ") "), offset);
              printf (_("lineno : %d macro : %s\n"),
                      lineno, string);
              break;

            default:
              if (op >= DW_MACRO_lo_user && op <= DW_MACRO_hi_user)
                {
                  printf (_(" <Target Specific macro op: %#x - UNHANDLED"), op);
                  break;
                }

              if (extended_ops == NULL || extended_ops[op] == NULL)
                {
                  error (_(" Unknown macro opcode %02x seen\n"), op);
                  return 0;
                }
              else
                {
                  /* Skip over unhandled opcodes.  */
                  uint64_t nargs, n;
                  unsigned char *desc = extended_ops[op];
                  READ_ULEB (nargs, desc, end);
                  if (nargs == 0)
                    {
                      printf (_(" DW_MACRO_%02x\n"), op);
                      break;
                    }
                  printf (_(" DW_MACRO_%02x -"), op);
                  for (n = 0; n < nargs; n++)
                    {
                      int val;

                      /* DW_FORM_implicit_const is not expected here.  */
                      SAFE_BYTE_GET_AND_INC (val, desc, 1, end);
                      curr
                        = read_and_display_attr_value (0, val, 0,
                                                       start, curr, end, 0, 0,
                                                       offset_size, version,
                                                       NULL, 0, section,
                                                       NULL, ' ', -1);
                      if (n != nargs - 1)
                        printf (",");
                    }
                  printf ("\n");
                }
              break;
            }
        }

      printf ("\n");
    }

  return 1;
}

static int
display_debug_abbrev (struct dwarf_section *section,
                      void *file ATTRIBUTE_UNUSED)
{
  abbrev_entry *entry;
  unsigned char *start = section->start;

  introduce (section, false);

  do
    {
      uint64_t offset = start - section->start;
      abbrev_list *list = find_and_process_abbrev_set (section, 0,
                                                       section->size, offset,
                                                       NULL);
      if (list == NULL)
        break;

      if (list->first_abbrev)
        printf (_("  Number TAG (%#" PRIx64 ")\n"), offset);

      for (entry = list->first_abbrev; entry; entry = entry->next)
        {
          abbrev_attr *attr;

          printf ("   %ld      %s    [%s]\n",
                  entry->number,
                  get_TAG_name (entry->tag),
                  entry->children ? _("has children") : _("no children"));

          for (attr = entry->first_attr; attr; attr = attr->next)
            {
              printf ("    %-18s %s",
                      get_AT_name (attr->attribute),
                      get_FORM_name (attr->form));
              if (attr->form == DW_FORM_implicit_const)
                printf (": %" PRId64, attr->implicit_const);
              putchar ('\n');
            }
        }
      start = list->start_of_next_abbrevs;
      free_abbrev_list (list);
    }
  while (start);

  printf ("\n");

  return 1;
}

/* Return true when ADDR is the maximum address, when addresses are
   POINTER_SIZE bytes long.  */

static bool
is_max_address (uint64_t addr, unsigned int pointer_size)
{
  uint64_t mask = ~(~(uint64_t) 0 << 1 << (pointer_size * 8 - 1));
  return ((addr & mask) == mask);
}

/* Display a view pair list starting at *VSTART_PTR and ending at
   VLISTEND within SECTION.  */

static void
display_view_pair_list (struct dwarf_section *section,
                        unsigned char **vstart_ptr,
                        unsigned int debug_info_entry,
                        unsigned char *vlistend)
{
  unsigned char *vstart = *vstart_ptr;
  unsigned char *section_end = section->start + section->size;
  unsigned int pointer_size = debug_information [debug_info_entry].pointer_size;

  if (vlistend < section_end)
    section_end = vlistend;

  putchar ('\n');

  while (vstart < section_end)
    {
      uint64_t off = vstart - section->start;
      uint64_t vbegin, vend;

      READ_ULEB (vbegin, vstart, section_end);
      if (vstart == section_end)
        break;

      READ_ULEB (vend, vstart, section_end);
      printf ("    %8.8" PRIx64 " ", off);

      print_view (vbegin, pointer_size);
      print_view (vend, pointer_size);
      printf (_("location view pair\n"));
    }

  putchar ('\n');
  *vstart_ptr = vstart;
}

/* Display a location list from a normal (ie, non-dwo) .debug_loc section.  */

static void
display_loc_list (struct dwarf_section *section,
                  unsigned char **start_ptr,
                  unsigned int debug_info_entry,
                  uint64_t offset,
                  uint64_t base_address,
                  unsigned char **vstart_ptr,
                  int has_frame_base)
{
  unsigned char *start = *start_ptr, *vstart = *vstart_ptr;
  unsigned char *section_end = section->start + section->size;
  uint64_t cu_offset;
  unsigned int pointer_size;
  unsigned int offset_size;
  int dwarf_version;
  uint64_t begin;
  uint64_t end;
  unsigned short length;
  int need_frame_base;

  if (debug_info_entry >= num_debug_info_entries)
    {
      warn (_("No debug information available for loc lists of entry: %u\n"),
            debug_info_entry);
      return;
    }

  cu_offset = debug_information [debug_info_entry].cu_offset;
  pointer_size = debug_information [debug_info_entry].pointer_size;
  offset_size = debug_information [debug_info_entry].offset_size;
  dwarf_version = debug_information [debug_info_entry].dwarf_version;

  if (pointer_size < 2 || pointer_size > 8)
    {
      warn (_("Invalid pointer size (%d) in debug info for entry %d\n"),
            pointer_size, debug_info_entry);
      return;
    }

  while (1)
    {
      uint64_t off = offset + (start - *start_ptr);
      uint64_t vbegin = -1, vend = -1;

      if (2 * pointer_size > (size_t) (section_end - start))
        {
          warn (_("Location list starting at offset %#" PRIx64
                  " is not terminated.\n"), offset);
          break;
        }

      printf ("    ");
      print_hex (off, 4);

      SAFE_BYTE_GET_AND_INC (begin, start, pointer_size, section_end);
      SAFE_BYTE_GET_AND_INC (end, start, pointer_size, section_end);

      if (begin == 0 && end == 0)
        {
          /* PR 18374: In a object file we can have a location list that
             starts with a begin and end of 0 because there are relocations
             that need to be applied to the addresses.  Actually applying
             the relocations now does not help as they will probably resolve
             to 0, since the object file has not been fully linked.  Real
             end of list markers will not have any relocations against them.  */
          if (! reloc_at (section, off)
              && ! reloc_at (section, off + pointer_size))
            {
              printf (_("<End of list>\n"));
              break;
            }
        }

      /* Check base address specifiers.  */
      if (is_max_address (begin, pointer_size)
          && !is_max_address (end, pointer_size))
        {
          base_address = end;
          print_hex (begin, pointer_size);
          print_hex (end, pointer_size);
          printf (_("(base address)\n"));
          continue;
        }

      if (vstart)
        {
          off = offset + (vstart - *start_ptr);

          READ_ULEB (vbegin, vstart, section_end);
          print_view (vbegin, pointer_size);

          READ_ULEB (vend, vstart, section_end);
          print_view (vend, pointer_size);

          printf (_("views at %8.8" PRIx64 " for:\n    %*s "), off, 8, "");
        }

      if (2 > (size_t) (section_end - start))
        {
          warn (_("Location list starting at offset %#" PRIx64
                  " is not terminated.\n"), offset);
          break;
        }

      SAFE_BYTE_GET_AND_INC (length, start, 2, section_end);

      if (length > (size_t) (section_end - start))
        {
          warn (_("Location list starting at offset %#" PRIx64
                  " is not terminated.\n"), offset);
          break;
        }

      print_hex (begin + base_address, pointer_size);
      print_hex (end + base_address, pointer_size);

      putchar ('(');
      need_frame_base = decode_location_expression (start,
                                                    pointer_size,
                                                    offset_size,
                                                    dwarf_version,
                                                    length,
                                                    cu_offset, section);
      putchar (')');

      if (need_frame_base && !has_frame_base)
        printf (_(" [without DW_AT_frame_base]"));

      if (begin == end && vbegin == vend)
        fputs (_(" (start == end)"), stdout);
      else if (begin > end || (begin == end && vbegin > vend))
        fputs (_(" (start > end)"), stdout);

      putchar ('\n');

      start += length;
    }

  *start_ptr = start;
  *vstart_ptr = vstart;
}

/* Display a location list from a normal (ie, non-dwo) .debug_loclists section.  */

static void
display_loclists_list (struct dwarf_section *  section,
                       unsigned char **        start_ptr,
                       unsigned int            debug_info_entry,
                       uint64_t                offset,
                       uint64_t                base_address,
                       unsigned char **        vstart_ptr,
                       int                     has_frame_base)
{
  unsigned char *start = *start_ptr;
  unsigned char *vstart = *vstart_ptr;
  unsigned char *section_end = section->start + section->size;
  uint64_t cu_offset;
  unsigned int pointer_size;
  unsigned int offset_size;
  unsigned int dwarf_version;

  /* Initialize it due to a false compiler warning.  */
  uint64_t begin = -1, vbegin = -1;
  uint64_t end = -1, vend = -1;
  uint64_t length;
  int need_frame_base;

  if (debug_info_entry >= num_debug_info_entries)
    {
      warn (_("No debug information available for "
              "loclists lists of entry: %u\n"),
            debug_info_entry);
      return;
    }

  cu_offset = debug_information [debug_info_entry].cu_offset;
  pointer_size = debug_information [debug_info_entry].pointer_size;
  offset_size = debug_information [debug_info_entry].offset_size;
  dwarf_version = debug_information [debug_info_entry].dwarf_version;

  if (pointer_size < 2 || pointer_size > 8)
    {
      warn (_("Invalid pointer size (%d) in debug info for entry %d\n"),
            pointer_size, debug_info_entry);
      return;
    }

  while (1)
    {
      uint64_t off = offset + (start - *start_ptr);
      enum dwarf_location_list_entry_type llet;

      if (start + 1 > section_end)
        {
          warn (_("Location list starting at offset %#" PRIx64
                  " is not terminated.\n"), offset);
          break;
        }

      printf ("    ");
      print_hex (off, 4);

      SAFE_BYTE_GET_AND_INC (llet, start, 1, section_end);

      if (vstart && (llet == DW_LLE_offset_pair
                     || llet == DW_LLE_start_end
                     || llet == DW_LLE_start_length))
        {
          off = offset + (vstart - *start_ptr);

          READ_ULEB (vbegin, vstart, section_end);
          print_view (vbegin, pointer_size);

          READ_ULEB (vend, vstart, section_end);
          print_view (vend, pointer_size);

          printf (_("views at %8.8" PRIx64 " for:\n    %*s "), off, 8, "");
        }

      switch (llet)
        {
        case DW_LLE_end_of_list:
          printf (_("<End of list>\n"));
          break;

        case DW_LLE_base_addressx:
          READ_ULEB (base_address, start, section_end);
          print_hex (base_address, pointer_size);
          printf (_("(index into .debug_addr) "));
          base_address = fetch_indexed_addr (base_address, pointer_size);
          print_hex (base_address, pointer_size);
          printf (_("(base address)\n"));
          break;

        case DW_LLE_startx_endx:
          READ_ULEB (begin, start, section_end);
          begin = fetch_indexed_addr (begin, pointer_size);
          READ_ULEB (end, start, section_end);
          end = fetch_indexed_addr (end, pointer_size);
          break;

        case DW_LLE_startx_length:
          READ_ULEB (begin, start, section_end);
          begin = fetch_indexed_addr (begin, pointer_size);
          READ_ULEB (end, start, section_end);
          end += begin;
          break;

        case DW_LLE_default_location:
          begin = end = 0;
          break;

        case DW_LLE_offset_pair:
          READ_ULEB (begin, start, section_end);
          begin += base_address;
          READ_ULEB (end, start, section_end);
          end += base_address;
          break;

        case DW_LLE_base_address:
          SAFE_BYTE_GET_AND_INC (base_address, start, pointer_size,
                                 section_end);
          print_hex (base_address, pointer_size);
          printf (_("(base address)\n"));
          break;

        case DW_LLE_start_end:
          SAFE_BYTE_GET_AND_INC (begin, start, pointer_size, section_end);
          SAFE_BYTE_GET_AND_INC (end, start, pointer_size, section_end);
          break;

        case DW_LLE_start_length:
          SAFE_BYTE_GET_AND_INC (begin, start, pointer_size, section_end);
          READ_ULEB (end, start, section_end);
          end += begin;
          break;

#ifdef DW_LLE_view_pair
        case DW_LLE_view_pair:
          if (vstart)
            printf (_("View pair entry in loclist with locviews attribute\n"));
          READ_ULEB (vbegin, start, section_end);
          print_view (vbegin, pointer_size);

          READ_ULEB (vend, start, section_end);
          print_view (vend, pointer_size);

          printf (_("views for:\n"));
          continue;
#endif

        default:
          error (_("Invalid location list entry type %d\n"), llet);
          return;
        }

      if (llet == DW_LLE_end_of_list)
        break;

      if (llet == DW_LLE_base_address
          || llet == DW_LLE_base_addressx)
        continue;

      if (start == section_end)
        {
          warn (_("Location list starting at offset %#" PRIx64
                  " is not terminated.\n"), offset);
          break;
        }
      READ_ULEB (length, start, section_end);

      if (length > (size_t) (section_end - start))
        {
          warn (_("Location list starting at offset %#" PRIx64
                  " is not terminated.\n"), offset);
          break;
        }

      print_hex (begin, pointer_size);
      print_hex (end, pointer_size);

      putchar ('(');
      need_frame_base = decode_location_expression (start,
                                                    pointer_size,
                                                    offset_size,
                                                    dwarf_version,
                                                    length,
                                                    cu_offset, section);
      putchar (')');

      if (need_frame_base && !has_frame_base)
        printf (_(" [without DW_AT_frame_base]"));

      if (begin == end && vbegin == vend)
        fputs (_(" (start == end)"), stdout);
      else if (begin > end || (begin == end && vbegin > vend))
        fputs (_(" (start > end)"), stdout);

      putchar ('\n');

      start += length;
      vbegin = vend = -1;
    }

  if (vbegin != (uint64_t) -1 || vend != (uint64_t) -1)
    printf (_("Trailing view pair not used in a range"));

  *start_ptr = start;
  *vstart_ptr = vstart;
}

/* Print a .debug_addr table index in decimal, surrounded by square brackets,
   right-adjusted in a field of length LEN, and followed by a space.  */

static void
print_addr_index (unsigned int idx, unsigned int len)
{
  static char buf[15];
  snprintf (buf, sizeof (buf), "[%d]", idx);
  printf ("%*s ", len, buf);
}

/* Display a location list from a .dwo section. It uses address indexes rather
   than embedded addresses.  This code closely follows display_loc_list, but the
   two are sufficiently different that combining things is very ugly.  */

static void
display_loc_list_dwo (struct dwarf_section *section,
                      unsigned char **start_ptr,
                      unsigned int debug_info_entry,
                      uint64_t offset,
                      unsigned char **vstart_ptr,
                      int has_frame_base)
{
  unsigned char *start = *start_ptr, *vstart = *vstart_ptr;
  unsigned char *section_end = section->start + section->size;
  uint64_t cu_offset;
  unsigned int pointer_size;
  unsigned int offset_size;
  int dwarf_version;
  int entry_type;
  unsigned short length;
  int need_frame_base;
  unsigned int idx;

  if (debug_info_entry >= num_debug_info_entries)
    {
      warn (_("No debug information for loc lists of entry: %u\n"),
            debug_info_entry);
      return;
    }

  cu_offset = debug_information [debug_info_entry].cu_offset;
  pointer_size = debug_information [debug_info_entry].pointer_size;
  offset_size = debug_information [debug_info_entry].offset_size;
  dwarf_version = debug_information [debug_info_entry].dwarf_version;

  if (pointer_size < 2 || pointer_size > 8)
    {
      warn (_("Invalid pointer size (%d) in debug info for entry %d\n"),
            pointer_size, debug_info_entry);
      return;
    }

  while (1)
    {
      printf ("    ");
      print_hex (offset + (start - *start_ptr), 4);

      if (start >= section_end)
        {
          warn (_("Location list starting at offset %#" PRIx64
                  " is not terminated.\n"), offset);
          break;
        }

      SAFE_BYTE_GET_AND_INC (entry_type, start, 1, section_end);

      if (vstart)
        switch (entry_type)
          {
          default:
            break;

          case 2:
          case 3:
          case 4:
            {
              uint64_t view;
              uint64_t off = offset + (vstart - *start_ptr);

              READ_ULEB (view, vstart, section_end);
              print_view (view, 8);

              READ_ULEB (view, vstart, section_end);
              print_view (view, 8);

              printf (_("views at %8.8" PRIx64 " for:\n    %*s "), off, 8, "");

            }
            break;
          }

      switch (entry_type)
        {
        case 0: /* A terminating entry.  */
          *start_ptr = start;
          *vstart_ptr = vstart;
          printf (_("<End of list>\n"));
          return;
        case 1: /* A base-address entry.  */
          READ_ULEB (idx, start, section_end);
          print_addr_index (idx, 8);
          printf ("%*s", 9 + (vstart ? 2 * 6 : 0), "");
          printf (_("(base address selection entry)\n"));
          continue;
        case 2: /* A start/end entry.  */
          READ_ULEB (idx, start, section_end);
          print_addr_index (idx, 8);
          READ_ULEB (idx, start, section_end);
          print_addr_index (idx, 8);
          break;
        case 3: /* A start/length entry.  */
          READ_ULEB (idx, start, section_end);
          print_addr_index (idx, 8);
          SAFE_BYTE_GET_AND_INC (idx, start, 4, section_end);
          printf ("%08x ", idx);
          break;
        case 4: /* An offset pair entry.  */
          SAFE_BYTE_GET_AND_INC (idx, start, 4, section_end);
          printf ("%08x ", idx);
          SAFE_BYTE_GET_AND_INC (idx, start, 4, section_end);
          printf ("%08x ", idx);
          break;
        default:
          warn (_("Unknown location list entry type 0x%x.\n"), entry_type);
          *start_ptr = start;
          *vstart_ptr = vstart;
          return;
        }

      if (2 > (size_t) (section_end - start))
        {
          warn (_("Location list starting at offset %#" PRIx64
                  " is not terminated.\n"), offset);
          break;
        }

      SAFE_BYTE_GET_AND_INC (length, start, 2, section_end);
      if (length > (size_t) (section_end - start))
        {
          warn (_("Location list starting at offset %#" PRIx64
                  " is not terminated.\n"), offset);
          break;
        }

      putchar ('(');
      need_frame_base = decode_location_expression (start,
                                                    pointer_size,
                                                    offset_size,
                                                    dwarf_version,
                                                    length,
                                                    cu_offset, section);
      putchar (')');

      if (need_frame_base && !has_frame_base)
        printf (_(" [without DW_AT_frame_base]"));

      putchar ('\n');

      start += length;
    }

  *start_ptr = start;
  *vstart_ptr = vstart;
}

/* Sort array of indexes in ascending order of loc_offsets[idx] and
   loc_views.  */

static uint64_t *loc_offsets, *loc_views;

static int
loc_offsets_compar (const void *ap, const void *bp)
{
  uint64_t a = loc_offsets[*(const unsigned int *) ap];
  uint64_t b = loc_offsets[*(const unsigned int *) bp];

  int ret = (a > b) - (b > a);
  if (ret)
    return ret;

  a = loc_views[*(const unsigned int *) ap];
  b = loc_views[*(const unsigned int *) bp];

  ret = (a > b) - (b > a);

  return ret;
}

static int
display_offset_entry_loclists (struct dwarf_section *section)
{
  unsigned char *  start = section->start;
  unsigned char * const end = start + section->size;

  introduce (section, false);

  do
    {
      uint64_t length;
      unsigned short version;
      unsigned char address_size;
      unsigned char segment_selector_size;
      uint32_t offset_entry_count;
      uint32_t i;
      bool is_64bit;

      printf (_("Table at Offset %#tx\n"), start - section->start);

      SAFE_BYTE_GET_AND_INC (length, start, 4, end);
      if (length == 0xffffffff)
        {
          is_64bit = true;
          SAFE_BYTE_GET_AND_INC (length, start, 8, end);
        }
      else
        is_64bit = false;

      SAFE_BYTE_GET_AND_INC (version, start, 2, end);
      SAFE_BYTE_GET_AND_INC (address_size, start, 1, end);
      SAFE_BYTE_GET_AND_INC (segment_selector_size, start, 1, end);
      SAFE_BYTE_GET_AND_INC (offset_entry_count, start, 4, end);

      printf (_("  Length:          %#" PRIx64 "\n"), length);
      printf (_("  DWARF version:   %u\n"), version);
      printf (_("  Address size:    %u\n"), address_size);
      printf (_("  Segment size:    %u\n"), segment_selector_size);
      printf (_("  Offset entries:  %u\n"), offset_entry_count);

      if (version < 5)
        {
          warn (_("The %s section contains a corrupt or "
                  "unsupported version number: %d.\n"),
                section->name, version);
          return 0;
        }

      if (segment_selector_size != 0)
        {
          warn (_("The %s section contains an "
                  "unsupported segment selector size: %d.\n"),
                section->name, segment_selector_size);
          return 0;
        }

      if (offset_entry_count == 0)
        {
          warn (_("The %s section contains a table without offset\n"),
                section->name);
          return 0;
        }

      printf (_("\n   Offset Entries starting at %#tx:\n"),
              start - section->start);

      for (i = 0; i < offset_entry_count; i++)
        {
          uint64_t entry;

          SAFE_BYTE_GET_AND_INC (entry, start, is_64bit ? 8 : 4, end);
          printf (_("    [%6u] %#" PRIx64 "\n"), i, entry);
        }

      putchar ('\n');

      uint32_t j;

      for (j = 1, i = 0; i < offset_entry_count;)
        {
          unsigned char lle;
          uint64_t base_address = 0;
          uint64_t begin;
          uint64_t finish;
          uint64_t off = start - section->start;

          if (j != i)
            {
              printf (_("   Offset Entry %u\n"), i);
              j = i;
            }

          printf ("    ");
          print_hex (off, 4);

          SAFE_BYTE_GET_AND_INC (lle, start, 1, end);

          switch (lle)
            {
            case DW_LLE_end_of_list:
              printf (_("<End of list>\n\n"));
              i ++;
              continue;

            case DW_LLE_base_addressx:
              READ_ULEB (base_address, start, end);
              print_hex (base_address, address_size);
              printf (_("(index into .debug_addr) "));
              base_address = fetch_indexed_addr (base_address, address_size);
              print_hex (base_address, address_size);
              printf (_("(base address)\n"));
              continue;

            case DW_LLE_startx_endx:
              READ_ULEB (begin, start, end);
              begin = fetch_indexed_addr (begin, address_size);
              READ_ULEB (finish, start, end);
              finish = fetch_indexed_addr (finish, address_size);
              break;

            case DW_LLE_startx_length:
              READ_ULEB (begin, start, end);
              begin = fetch_indexed_addr (begin, address_size);
              READ_ULEB (finish, start, end);
              finish += begin;
              break;

            case DW_LLE_offset_pair:
              READ_ULEB (begin, start, end);
              begin += base_address;
              READ_ULEB (finish, start, end);
              finish += base_address;
              break;

            case DW_LLE_default_location:
              begin = finish = 0;
              break;

            case DW_LLE_base_address:
              SAFE_BYTE_GET_AND_INC (base_address, start, address_size, end);
              print_hex (base_address, address_size);
              printf (_("(base address)\n"));
              continue;

            case DW_LLE_start_end:
              SAFE_BYTE_GET_AND_INC (begin,  start, address_size, end);
              SAFE_BYTE_GET_AND_INC (finish, start, address_size, end);
              break;

            case DW_LLE_start_length:
              SAFE_BYTE_GET_AND_INC (begin, start, address_size, end);
              READ_ULEB (finish, start, end);
              finish += begin;
              break;

            default:
              error (_("Invalid location list entry type %d\n"), lle);
              return 0;
            }

          if (start == end)
            {
              warn (_("Location list starting at offset %#" PRIx64
                      " is not terminated.\n"), off);
              break;
            }

          print_hex (begin, address_size);
          print_hex (finish, address_size);

          if (begin == finish)
            fputs (_("(start == end)"), stdout);
          else if (begin > finish)
            fputs (_("(start > end)"), stdout);

          /* Read the counted location descriptions.  */
          READ_ULEB (length, start, end);

          if (length > (size_t) (end - start))
            {
              warn (_("Location list starting at offset %#" PRIx64
                      " is not terminated.\n"), off);
              break;
            }

          (void) decode_location_expression (start, address_size, address_size,
                                             version, length, 0, section);
          start += length;
          putchar ('\n');
        }

      putchar ('\n');
    }
  while (start < end);

  return 1;
}

static int
display_debug_loc (struct dwarf_section *section, void *file)
{
  unsigned char *start = section->start, *vstart = NULL;
  uint64_t bytes;
  unsigned char *section_begin = start;
  unsigned int num_loc_list = 0;
  uint64_t last_offset = 0;
  uint64_t last_view = 0;
  unsigned int first = 0;
  unsigned int i;
  unsigned int j;
  int seen_first_offset = 0;
  int locs_sorted = 1;
  unsigned char *next = start, *vnext = vstart;
  unsigned int *array = NULL;
  const char *suffix = strrchr (section->name, '.');
  bool is_dwo = false;
  int is_loclists = strstr (section->name, "debug_loclists") != NULL;
  uint64_t header_size = 0;

  if (suffix && strcmp (suffix, ".dwo") == 0)
    is_dwo = true;

  bytes = section->size;

  if (bytes == 0)
    {
      printf (_("\nThe %s section is empty.\n"), section->name);
      return 0;
    }

  if (is_loclists)
    {
      unsigned char *hdrptr = section_begin;
      uint64_t ll_length;
      unsigned short ll_version;
      unsigned char *end = section_begin + section->size;
      unsigned char address_size, segment_selector_size;
      uint32_t offset_entry_count;

      SAFE_BYTE_GET_AND_INC (ll_length, hdrptr, 4, end);
      if (ll_length == 0xffffffff)
        SAFE_BYTE_GET_AND_INC (ll_length, hdrptr, 8, end);

      SAFE_BYTE_GET_AND_INC (ll_version, hdrptr, 2, end);
      if (ll_version != 5)
        {
          warn (_("The %s section contains corrupt or "
                  "unsupported version number: %d.\n"),
                section->name, ll_version);
          return 0;
        }

      SAFE_BYTE_GET_AND_INC (address_size, hdrptr, 1, end);

      SAFE_BYTE_GET_AND_INC (segment_selector_size, hdrptr, 1, end);
      if (segment_selector_size != 0)
        {
          warn (_("The %s section contains "
                  "unsupported segment selector size: %d.\n"),
                section->name, segment_selector_size);
          return 0;
        }

      SAFE_BYTE_GET_AND_INC (offset_entry_count, hdrptr, 4, end);

      if (offset_entry_count != 0)
        return display_offset_entry_loclists (section);

      header_size = hdrptr - section_begin;
    }

  if (load_debug_info (file) == 0)
    {
      warn (_("Unable to load/parse the .debug_info section, so cannot interpret the %s section.\n"),
            section->name);
      return 0;
    }

  /* Check the order of location list in .debug_info section. If
     offsets of location lists are in the ascending order, we can
     use `debug_information' directly.  */
  for (i = 0; i < num_debug_info_entries; i++)
    {
      unsigned int num;

      num = debug_information [i].num_loc_offsets;
      if (num > num_loc_list)
        num_loc_list = num;

      /* Check if we can use `debug_information' directly.  */
      if (locs_sorted && num != 0)
        {
          if (!seen_first_offset)
            {
              /* This is the first location list.  */
              last_offset = debug_information [i].loc_offsets [0];
              last_view = debug_information [i].loc_views [0];
              first = i;
              seen_first_offset = 1;
              j = 1;
            }
          else
            j = 0;

          for (; j < num; j++)
            {
              if (last_offset >
                  debug_information [i].loc_offsets [j]
                  || (last_offset == debug_information [i].loc_offsets [j]
                      && last_view > debug_information [i].loc_views [j]))
                {
                  locs_sorted = 0;
                  break;
                }
              last_offset = debug_information [i].loc_offsets [j];
              last_view = debug_information [i].loc_views [j];
            }
        }
    }

  if (!seen_first_offset)
    error (_("No location lists in .debug_info section!\n"));

  if (debug_information [first].num_loc_offsets > 0
      && debug_information [first].loc_offsets [0] != header_size
      && debug_information [first].loc_views [0] != header_size)
    warn (_("Location lists in %s section start at %#" PRIx64
            " rather than %#" PRIx64 "\n"),
          section->name, debug_information [first].loc_offsets [0],
          header_size);

  if (!locs_sorted)
    array = (unsigned int *) xcmalloc (num_loc_list, sizeof (unsigned int));

  introduce (section, false);

  if (reloc_at (section, 0))
    printf (_(" Warning: This section has relocations - addresses seen here may not be accurate.\n\n"));

  printf (_("    Offset   Begin            End              Expression\n"));

  for (i = first; i < num_debug_info_entries; i++)
    {
      uint64_t offset = 0, voffset = 0;
      uint64_t base_address;
      unsigned int k;
      int has_frame_base;

      if (!locs_sorted)
        {
          for (k = 0; k < debug_information [i].num_loc_offsets; k++)
            array[k] = k;
          loc_offsets = debug_information [i].loc_offsets;
          loc_views = debug_information [i].loc_views;
          qsort (array, debug_information [i].num_loc_offsets,
                 sizeof (*array), loc_offsets_compar);
        }

      /* .debug_loclists has a per-unit header.
         Update start if we are detecting it.  */
      if (debug_information [i].dwarf_version == 5)
        {
          j = locs_sorted ? 0 : array [0];

          if (debug_information [i].num_loc_offsets)
            offset = debug_information [i].loc_offsets [j];

          if (debug_information [i].num_loc_views)
            voffset = debug_information [i].loc_views [j];

          /* Assume that the size of the header is constant across CUs. */
          if (((start - section_begin) + header_size == offset)
              || ((start -section_begin) + header_size == voffset))
            start += header_size;
        }

      int adjacent_view_loclists = 1;
      for (k = 0; k < debug_information [i].num_loc_offsets; k++)
        {
          j = locs_sorted ? k : array[k];
          if (k
              && (debug_information [i].loc_offsets [locs_sorted
                                                    ? k - 1 : array [k - 1]]
                  == debug_information [i].loc_offsets [j])
              && (debug_information [i].loc_views [locs_sorted
                                                   ? k - 1 : array [k - 1]]
                  == debug_information [i].loc_views [j]))
            continue;
          has_frame_base = debug_information [i].have_frame_base [j];
          offset = debug_information [i].loc_offsets [j];
          next = section_begin + offset;
          voffset = debug_information [i].loc_views [j];
          if (voffset != (uint64_t) -1)
            vnext = section_begin + voffset;
          else
            vnext = NULL;
          base_address = debug_information [i].base_address;

          if (vnext && vnext < next)
            {
              vstart = vnext;
              display_view_pair_list (section, &vstart, i, next);
              if (start == vnext)
                start = vstart;
            }

          if (start < next)
            {
              if (vnext && vnext < next)
                warn (_("There is a hole [%#tx - %#" PRIx64 "]"
                        " in %s section.\n"),
                      start - section_begin, voffset, section->name);
              else
                warn (_("There is a hole [%#tx - %#" PRIx64 "]"
                        " in %s section.\n"),
                      start - section_begin, offset, section->name);
            }
          else if (start > next)
            warn (_("There is an overlap [%#tx - %#" PRIx64 "]"
                    " in %s section.\n"),
                  start - section_begin, offset, section->name);
          start = next;
          vstart = vnext;

          if (offset >= bytes)
            {
              warn (_("Offset %#" PRIx64 " is bigger than %s section size.\n"),
                    offset, section->name);
              continue;
            }

          if (vnext && voffset >= bytes)
            {
              warn (_("View Offset %#" PRIx64 " is bigger than %s section size.\n"),
                    voffset, section->name);
              continue;
            }

          if (!is_loclists)
            {
              if (is_dwo)
                display_loc_list_dwo (section, &start, i, offset,
                                      &vstart, has_frame_base);
              else
                display_loc_list (section, &start, i, offset, base_address,
                                  &vstart, has_frame_base);
            }
          else
            {
              if (is_dwo)
                warn (_("DWO is not yet supported.\n"));
              else
                display_loclists_list (section, &start, i, offset, base_address,
                                       &vstart, has_frame_base);
            }

          /* FIXME: this arrangement is quite simplistic.  Nothing
             requires locview lists to be adjacent to corresponding
             loclists, and a single loclist could be augmented by
             different locview lists, and vice-versa, unlikely as it
             is that it would make sense to do so.  Hopefully we'll
             have view pair support built into loclists before we ever
             need to address all these possibilities.  */
          if (adjacent_view_loclists && vnext
              && vnext != start && vstart != next)
            {
              adjacent_view_loclists = 0;
              warn (_("Hole and overlap detection requires adjacent view lists and loclists.\n"));
            }

          if (vnext && vnext == start)
            display_view_pair_list (section, &start, i, vstart);
        }
    }

  if (start < section->start + section->size)
    warn (ngettext ("There is %ld unused byte at the end of section %s\n",
                    "There are %ld unused bytes at the end of section %s\n",
                    (long) (section->start + section->size - start)),
          (long) (section->start + section->size - start), section->name);
  putchar ('\n');
  free (array);
  return 1;
}

static int
display_debug_str (struct dwarf_section *section,
                   void *file ATTRIBUTE_UNUSED)
{
  unsigned char *start = section->start;
  uint64_t bytes = section->size;
  uint64_t addr = section->address;

  if (bytes == 0)
    {
      printf (_("\nThe %s section is empty.\n"), section->name);
      return 0;
    }

  introduce (section, false);

  while (bytes)
    {
      int j;
      int k;
      int lbytes;

      lbytes = (bytes > 16 ? 16 : bytes);

      printf ("  0x%8.8" PRIx64 " ", addr);

      for (j = 0; j < 16; j++)
        {
          if (j < lbytes)
            printf ("%2.2x", start[j]);
          else
            printf ("  ");

          if ((j & 3) == 3)
            printf (" ");
        }

      for (j = 0; j < lbytes; j++)
        {
          k = start[j];
          if (k >= ' ' && k < 0x80)
            printf ("%c", k);
          else
            printf (".");
        }

      putchar ('\n');

      start += lbytes;
      addr  += lbytes;
      bytes -= lbytes;
    }

  putchar ('\n');

  return 1;
}

static int
display_debug_info (struct dwarf_section *section, void *file)
{
  return process_debug_info (section, file, section->abbrev_sec, false, false);
}

static int
display_debug_types (struct dwarf_section *section, void *file)
{
  return process_debug_info (section, file, section->abbrev_sec, false, true);
}

static int
display_trace_info (struct dwarf_section *section, void *file)
{
  return process_debug_info (section, file, section->abbrev_sec, false, true);
}

static int
display_debug_aranges (struct dwarf_section *section,
                       void *file ATTRIBUTE_UNUSED)
{
  unsigned char *start = section->start;
  unsigned char *end = start + section->size;

  introduce (section, false);

  /* It does not matter if this load fails,
     we test for that later on.  */
  load_debug_info (file);

  while (start < end)
    {
      unsigned char *hdrptr;
      DWARF2_Internal_ARange arange;
      unsigned char *addr_ranges;
      uint64_t length;
      uint64_t address;
      uint64_t sec_off;
      unsigned char address_size;
      unsigned int offset_size;
      unsigned char *end_ranges;

      hdrptr = start;
      sec_off = hdrptr - section->start;

      SAFE_BYTE_GET_AND_INC (arange.ar_length, hdrptr, 4, end);
      if (arange.ar_length == 0xffffffff)
        {
          SAFE_BYTE_GET_AND_INC (arange.ar_length, hdrptr, 8, end);
          offset_size = 8;
        }
      else
        offset_size = 4;

      if (arange.ar_length > (size_t) (end - hdrptr))
        {
          warn (_("Debug info is corrupted, %s header at %#" PRIx64
                  " has length %#" PRIx64 "\n"),
                section->name, sec_off, arange.ar_length);
          break;
        }
      end_ranges = hdrptr + arange.ar_length;

      SAFE_BYTE_GET_AND_INC (arange.ar_version, hdrptr, 2, end_ranges);
      SAFE_BYTE_GET_AND_INC (arange.ar_info_offset, hdrptr, offset_size,
                             end_ranges);

      if (num_debug_info_entries != DEBUG_INFO_UNAVAILABLE
          && num_debug_info_entries > 0
          && find_debug_info_for_offset (arange.ar_info_offset) == NULL)
        warn (_(".debug_info offset of %#" PRIx64
                " in %s section does not point to a CU header.\n"),
              arange.ar_info_offset, section->name);

      SAFE_BYTE_GET_AND_INC (arange.ar_pointer_size, hdrptr, 1, end_ranges);
      SAFE_BYTE_GET_AND_INC (arange.ar_segment_size, hdrptr, 1, end_ranges);

      if (arange.ar_version != 2 && arange.ar_version != 3)
        {
          /* PR 19872: A version number of 0 probably means that there is
             padding at the end of the .debug_aranges section.  Gold puts
             it there when performing an incremental link, for example.
             So do not generate a warning in this case.  */
          if (arange.ar_version)
            warn (_("Only DWARF 2 and 3 aranges are currently supported.\n"));
          break;
        }

      printf (_("  Length:                   %" PRId64 "\n"), arange.ar_length);
      printf (_("  Version:                  %d\n"), arange.ar_version);
      printf (_("  Offset into .debug_info:  %#" PRIx64 "\n"),
              arange.ar_info_offset);
      printf (_("  Pointer Size:             %d\n"), arange.ar_pointer_size);
      printf (_("  Segment Size:             %d\n"), arange.ar_segment_size);

      address_size = arange.ar_pointer_size + arange.ar_segment_size;

      /* PR 17512: file: 001-108546-0.001:0.1.  */
      if (address_size == 0 || address_size > 8)
        {
          error (_("Invalid address size in %s section!\n"),
                 section->name);
          break;
        }

      /* The DWARF spec does not require that the address size be a power
         of two, but we do.  This will have to change if we ever encounter
         an uneven architecture.  */
      if ((address_size & (address_size - 1)) != 0)
        {
          warn (_("Pointer size + Segment size is not a power of two.\n"));
          break;
        }

      if (address_size > 4)
        printf (_("\n    Address            Length\n"));
      else
        printf (_("\n    Address    Length\n"));

      addr_ranges = hdrptr;

      /* Must pad to an alignment boundary that is twice the address size.  */
      addr_ranges += (2 * address_size - 1
                      - (hdrptr - start - 1) % (2 * address_size));

      while (2 * address_size <= end_ranges - addr_ranges)
        {
          SAFE_BYTE_GET_AND_INC (address, addr_ranges, address_size,
                                 end_ranges);
          SAFE_BYTE_GET_AND_INC (length, addr_ranges, address_size,
                                 end_ranges);
          printf ("    ");
          print_hex (address, address_size);
          print_hex_ns (length, address_size);
          putchar ('\n');
        }

      start = end_ranges;
    }

  printf ("\n");

  return 1;
}

/* Comparison function for qsort.  */
static int
comp_addr_base (const void * v0, const void * v1)
{
  debug_info *info0 = *(debug_info **) v0;
  debug_info *info1 = *(debug_info **) v1;
  return info0->addr_base - info1->addr_base;
}

/* Display the debug_addr section.  */
static int
display_debug_addr (struct dwarf_section *section,
                    void *file)
{
  debug_info **debug_addr_info;
  unsigned char *entry;
  unsigned char *end;
  unsigned int i;
  unsigned int count;
  unsigned char * header;

  if (section->size == 0)
    {
      printf (_("\nThe %s section is empty.\n"), section->name);
      return 0;
    }

  if (load_debug_info (file) == 0)
    {
      warn (_("Unable to load/parse the .debug_info section, so cannot interpret the %s section.\n"),
            section->name);
      return 0;
    }

  introduce (section, false);

  /* PR  17531: file: cf38d01b.
     We use xcalloc because a corrupt file may not have initialised all of the
     fields in the debug_info structure, which means that the sort below might
     try to move uninitialised data.  */
  debug_addr_info = (debug_info **) xcalloc ((num_debug_info_entries + 1),
                                             sizeof (debug_info *));

  count = 0;
  for (i = 0; i < num_debug_info_entries; i++)
    if (debug_information [i].addr_base != DEBUG_INFO_UNAVAILABLE)
      {
        /* PR 17531: file: cf38d01b.  */
        if (debug_information[i].addr_base >= section->size)
          warn (_("Corrupt address base (%#" PRIx64 ")"
                  " found in debug section %u\n"),
                debug_information[i].addr_base, i);
        else
          debug_addr_info [count++] = debug_information + i;
      }

  /* Add a sentinel to make iteration convenient.  */
  debug_addr_info [count] = (debug_info *) xmalloc (sizeof (debug_info));
  debug_addr_info [count]->addr_base = section->size;
  qsort (debug_addr_info, count, sizeof (debug_info *), comp_addr_base);

  header = section->start;
  for (i = 0; i < count; i++)
    {
      unsigned int idx;
      unsigned int address_size = debug_addr_info [i]->pointer_size;

      printf (_("  For compilation unit at offset %#" PRIx64 ":\n"),
              debug_addr_info [i]->cu_offset);

      printf (_("\tIndex\tAddress\n"));
      entry = section->start + debug_addr_info [i]->addr_base;
      if (debug_addr_info [i]->dwarf_version >= 5)
        {
          size_t header_size = entry - header;
          unsigned char *curr_header = header;
          uint64_t length;
          int version;
          int segment_selector_size;

          if (header_size != 8 && header_size != 16)
            {
              warn (_("Corrupt %s section: expecting header size of 8 or 16, but found %zd instead\n"),
                    section->name, header_size);
              return 0;
            }

          SAFE_BYTE_GET_AND_INC (length, curr_header, 4, entry);
          if (length == 0xffffffff)
            SAFE_BYTE_GET_AND_INC (length, curr_header, 8, entry);
          if (length > (size_t) (section->start + section->size - curr_header)
              || length < (size_t) (entry - curr_header))
            {
              warn (_("Corrupt %s section: unit_length field of %#" PRIx64
                      " is invalid\n"), section->name, length);
              return 0;
            }
          end = curr_header + length;
          SAFE_BYTE_GET_AND_INC (version, curr_header, 2, entry);
          if (version != 5)
            warn (_("Corrupt %s section: expecting version number 5 in header but found %d instead\n"),
                  section->name, version);

          SAFE_BYTE_GET_AND_INC (address_size, curr_header, 1, entry);
          SAFE_BYTE_GET_AND_INC (segment_selector_size, curr_header, 1, entry);
          address_size += segment_selector_size;
        }
      else
        end = section->start + debug_addr_info [i + 1]->addr_base;

      header = end;
      idx = 0;

      if (address_size < 1 || address_size > sizeof (uint64_t))
        {
          warn (_("Corrupt %s section: address size (%x) is wrong"),
                section->name, address_size);
          return 0;
        }

      while ((size_t) (end - entry) >= address_size)
        {
          uint64_t base = byte_get (entry, address_size);
          printf (_("\t%d:\t"), idx);
          print_hex_ns (base, address_size);
          printf ("\n");
          entry += address_size;
          idx++;
        }
    }
  printf ("\n");

  free (debug_addr_info);
  return 1;
}

/* Display the .debug_str_offsets and .debug_str_offsets.dwo sections.  */

static int
display_debug_str_offsets (struct dwarf_section *section,
                           void *file ATTRIBUTE_UNUSED)
{
  unsigned long idx;

  if (section->size == 0)
    {
      printf (_("\nThe %s section is empty.\n"), section->name);
      return 0;
    }

  unsigned char *start = section->start;
  unsigned char *end = start + section->size;
  unsigned char *curr = start;
  uint64_t debug_str_offsets_hdr_len;

  const char *suffix = strrchr (section->name, '.');
  bool dwo = suffix && strcmp (suffix, ".dwo") == 0;

  if (dwo)
    load_debug_section_with_follow (str_dwo, file);
  else
    load_debug_section_with_follow (str, file);

  introduce (section, false);

  while (curr < end)
    {
      uint64_t length;
      uint64_t entry_length;

      SAFE_BYTE_GET_AND_INC (length, curr, 4, end);
      /* FIXME: We assume that this means 64-bit DWARF is being used.  */
      if (length == 0xffffffff)
        {
          SAFE_BYTE_GET_AND_INC (length, curr, 8, end);
          entry_length = 8;
          debug_str_offsets_hdr_len = 16;
        }
      else
        {
          entry_length = 4;
          debug_str_offsets_hdr_len = 8;
        }

      unsigned char *entries_end;
      if (length == 0)
        {
          /* This is probably an old style .debug_str_offset section which
             just contains offsets and no header (and the first offset is 0).  */
          length = section->size;
          curr   = section->start;
          entries_end = end;

          printf (_("    Length: %#" PRIx64 "\n"), length);
          printf (_("       Index   Offset [String]\n"));
        }
      else
        {
          if (length <= (size_t) (end - curr))
            entries_end = curr + length;
          else
            {
              warn (_("Section %s is too small %#" PRIx64 "\n"),
                    section->name, section->size);
              entries_end = end;
            }

          int version;
          SAFE_BYTE_GET_AND_INC (version, curr, 2, entries_end);
          if (version != 5)
            warn (_("Unexpected version number in str_offset header: %#x\n"), version);

          int padding;
          SAFE_BYTE_GET_AND_INC (padding, curr, 2, entries_end);
          if (padding != 0)
            warn (_("Unexpected value in str_offset header's padding field: %#x\n"), padding);

          printf (_("    Length: %#" PRIx64 "\n"), length);
          printf (_("    Version: %#x\n"), version);
          printf (_("       Index   Offset [String]\n"));
        }

      for (idx = 0; curr < entries_end; idx++)
        {
          uint64_t offset;
          const unsigned char * string;

          if ((size_t) (entries_end - curr) < entry_length)
            /* Not enough space to read one entry_length, give up.  */
            return 0;

          SAFE_BYTE_GET_AND_INC (offset, curr, entry_length, entries_end);
          if (dwo)
            string = (const unsigned char *)
              fetch_indexed_string (idx, NULL, entry_length, dwo, debug_str_offsets_hdr_len);
          else
            string = fetch_indirect_string (offset);

          printf ("    %8lu ", idx);
          print_hex (offset, entry_length);
          printf (" %s\n", string);
        }
    }

  return 1;
}

/* Each debug_information[x].range_lists[y] gets this representation for
   sorting purposes.  */

struct range_entry
{
  /* The debug_information[x].range_lists[y] value.  */
  uint64_t ranges_offset;

  /* Original debug_information to find parameters of the data.  */
  debug_info *debug_info_p;
};

/* Sort struct range_entry in ascending order of its RANGES_OFFSET.  */

static int
range_entry_compar (const void *ap, const void *bp)
{
  const struct range_entry *a_re = (const struct range_entry *) ap;
  const struct range_entry *b_re = (const struct range_entry *) bp;
  const uint64_t a = a_re->ranges_offset;
  const uint64_t b = b_re->ranges_offset;

  return (a > b) - (b > a);
}

static void
display_debug_ranges_list (unsigned char *  start,
                           unsigned char *  finish,
                           unsigned int     pointer_size,
                           uint64_t         offset,
                           uint64_t         base_address)
{
  while (start < finish)
    {
      uint64_t begin;
      uint64_t end;

      SAFE_BYTE_GET_AND_INC (begin, start, pointer_size, finish);
      if (start >= finish)
        break;
      SAFE_SIGNED_BYTE_GET_AND_INC (end, start, pointer_size, finish);

      printf ("    ");
      print_hex (offset, 4);

      if (begin == 0 && end == 0)
        {
          printf (_("<End of list>\n"));
          break;
        }

      /* Check base address specifiers.  */
      if (is_max_address (begin, pointer_size)
          && !is_max_address (end, pointer_size))
        {
          base_address = end;
          print_hex (begin, pointer_size);
          print_hex (end, pointer_size);
          printf ("(base address)\n");
          continue;
        }

      print_hex (begin + base_address, pointer_size);
      print_hex_ns (end + base_address, pointer_size);

      if (begin == end)
        fputs (_(" (start == end)"), stdout);
      else if (begin > end)
        fputs (_(" (start > end)"), stdout);

      putchar ('\n');
    }
}

static unsigned char *
display_debug_rnglists_list (unsigned char * start,
                             unsigned char * finish,
                             unsigned int    pointer_size,
                             uint64_t        offset,
                             uint64_t        base_address,
                             unsigned int    offset_size)
{
  unsigned char *next = start;
  unsigned int debug_addr_section_hdr_len;

  if (offset_size == 4)
    debug_addr_section_hdr_len = 8;
  else
    debug_addr_section_hdr_len = 16;

  while (1)
    {
      uint64_t off = offset + (start - next);
      enum dwarf_range_list_entry rlet;
      /* Initialize it due to a false compiler warning.  */
      uint64_t begin = -1, length, end = -1;

      if (start >= finish)
        {
          warn (_("Range list starting at offset %#" PRIx64
                  " is not terminated.\n"), offset);
          break;
        }

      printf ("    ");
      print_hex (off, 4);

      SAFE_BYTE_GET_AND_INC (rlet, start, 1, finish);

      switch (rlet)
        {
        case DW_RLE_end_of_list:
          printf (_("<End of list>\n"));
          break;
        case DW_RLE_base_addressx:
          READ_ULEB (base_address, start, finish);
          print_hex (base_address, pointer_size);
          printf (_("(base address index) "));
          base_address = fetch_indexed_addr ((base_address * pointer_size)
                                             + debug_addr_section_hdr_len, pointer_size);
          print_hex (base_address, pointer_size);
          printf (_("(base address)\n"));
          break;
        case DW_RLE_startx_endx:
          READ_ULEB (begin, start, finish);
          READ_ULEB (end, start, finish);
          begin = fetch_indexed_addr ((begin * pointer_size)
                                      + debug_addr_section_hdr_len, pointer_size);
          end   = fetch_indexed_addr ((begin * pointer_size)
                                      + debug_addr_section_hdr_len, pointer_size);
          break;
        case DW_RLE_startx_length:
          READ_ULEB (begin, start, finish);
          READ_ULEB (length, start, finish);
          begin = fetch_indexed_addr ((begin * pointer_size)
                                      + debug_addr_section_hdr_len, pointer_size);
          end = begin + length;
          break;
        case DW_RLE_offset_pair:
          READ_ULEB (begin, start, finish);
          READ_ULEB (end, start, finish);
          break;
        case DW_RLE_base_address:
          SAFE_BYTE_GET_AND_INC (base_address, start, pointer_size, finish);
          print_hex (base_address, pointer_size);
          printf (_("(base address)\n"));
          break;
        case DW_RLE_start_end:
          SAFE_BYTE_GET_AND_INC (begin, start, pointer_size, finish);
          SAFE_BYTE_GET_AND_INC (end, start, pointer_size, finish);
          break;
        case DW_RLE_start_length:
          SAFE_BYTE_GET_AND_INC (begin, start, pointer_size, finish);
          READ_ULEB (length, start, finish);
          end = begin + length;
          break;
        default:
          error (_("Invalid range list entry type %d\n"), rlet);
          rlet = DW_RLE_end_of_list;
          break;
        }

      if (rlet == DW_RLE_end_of_list)
        break;
      if (rlet == DW_RLE_base_address || rlet == DW_RLE_base_addressx)
        continue;

      /* Only a DW_RLE_offset_pair needs the base address added.  */
      if (rlet == DW_RLE_offset_pair)
        {
          begin += base_address;
          end += base_address;
        }

      print_hex (begin, pointer_size);
      print_hex (end, pointer_size);

      if (begin == end)
        fputs (_(" (start == end)"), stdout);
      else if (begin > end)
        fputs (_(" (start > end)"), stdout);

      putchar ('\n');
    }

  return start;
}

static int
display_debug_rnglists (struct dwarf_section *section)
{
  unsigned char *start = section->start;
  unsigned char *finish = start + section->size;

  while (start < finish)
    {
      unsigned char *table_start;
      uint64_t offset = start - section->start;
      unsigned char *end;
      uint64_t initial_length;
      unsigned char segment_selector_size;
      unsigned int offset_entry_count;
      unsigned int i;
      unsigned short version;
      unsigned char address_size = 0;
      unsigned char offset_size;

      /* Get and check the length of the block.  */
      SAFE_BYTE_GET_AND_INC (initial_length, start, 4, finish);

      if (initial_length == 0xffffffff)
        {
          /* This section is 64-bit DWARF 3.  */
          SAFE_BYTE_GET_AND_INC (initial_length, start, 8, finish);
          offset_size = 8;
        }
      else
        offset_size = 4;

      if (initial_length > (size_t) (finish - start))
        {
          /* If the length field has a relocation against it, then we should
             not complain if it is inaccurate (and probably negative).
             It is copied from .debug_line handling code.  */
          if (reloc_at (section, (start - section->start) - offset_size))
            initial_length = finish - start;
          else
            {
              warn (_("The length field (%#" PRIx64
                      ") in the debug_rnglists header is wrong"
                      " - the section is too small\n"),
                    initial_length);
              return 0;
            }
        }

      end = start + initial_length;

      /* Get the other fields in the header.  */
      SAFE_BYTE_GET_AND_INC (version, start, 2, finish);
      SAFE_BYTE_GET_AND_INC (address_size, start, 1, finish);
      SAFE_BYTE_GET_AND_INC (segment_selector_size, start, 1, finish);
      SAFE_BYTE_GET_AND_INC (offset_entry_count, start, 4, finish);

      printf (_(" Table at Offset: %#" PRIx64 ":\n"), offset);
      printf (_("  Length:          %#" PRIx64 "\n"), initial_length);
      printf (_("  DWARF version:   %u\n"), version);
      printf (_("  Address size:    %u\n"), address_size);
      printf (_("  Segment size:    %u\n"), segment_selector_size);
      printf (_("  Offset entries:  %u\n"), offset_entry_count);

      /* Check the fields.  */
      if (segment_selector_size != 0)
        {
          warn (_("The %s section contains "
                  "unsupported segment selector size: %d.\n"),
                section->name, segment_selector_size);
          return 0;
        }

      if (version < 5)
        {
          warn (_("Only DWARF version 5+ debug_rnglists info "
                  "is currently supported.\n"));
          return 0;
        }

      table_start = start;

      if (offset_entry_count != 0)
        {
          printf (_("\n   Offsets starting at %#tx:\n"),
                  start - section->start);

          for (i = 0; i < offset_entry_count; i++)
            {
              uint64_t entry;

              SAFE_BYTE_GET_AND_INC (entry, start, offset_size, finish);
              printf (_("    [%6u] %#" PRIx64 "\n"), i, entry);
            }
        }
      else
        offset_entry_count = 1;

      for (i = 0; i < offset_entry_count; i++)
        {
          uint64_t indx = start - table_start;

          offset = start - section->start;
          printf (_("\n  Offset: %#" PRIx64 ", Index: %#" PRIx64 "\n"),
                  offset, indx);
          printf (_("    Offset   Begin    End\n"));
          start = display_debug_rnglists_list
            (start, end, address_size, offset, 0, offset_size);
          if (start >= end)
            break;
        }

      start = end;

      if (start < finish)
        putchar ('\n');
    }

  putchar ('\n');
  return 1;
}

static int
display_debug_ranges (struct dwarf_section *section,
                      void *file ATTRIBUTE_UNUSED)
{
  unsigned char *start = section->start;
  unsigned char *last_start = start;
  uint64_t bytes = section->size;
  unsigned char *section_begin = start;
  unsigned char *finish = start + bytes;
  unsigned int num_range_list, i;
  struct range_entry *range_entries;
  struct range_entry *range_entry_fill;
  int is_rnglists = strstr (section->name, "debug_rnglists") != NULL;
  /* Initialize it due to a false compiler warning.  */
  unsigned char address_size = 0;
  uint64_t last_offset = 0;

  if (bytes == 0)
    {
      printf (_("\nThe %s section is empty.\n"), section->name);
      return 0;
    }

  introduce (section, false);

  if (is_rnglists)
    return display_debug_rnglists (section);

  if (load_debug_info (file) == 0)
    {
      warn (_("Unable to load/parse the .debug_info section, so cannot interpret the %s section.\n"),
            section->name);
      return 0;
    }

  num_range_list = 0;
  for (i = 0; i < num_debug_info_entries; i++)
    num_range_list += debug_information [i].num_range_lists;

  if (num_range_list == 0)
    {
      /* This can happen when the file was compiled with -gsplit-debug
         which removes references to range lists from the primary .o file.  */
      printf (_("No range lists in .debug_info section.\n"));
      return 1;
    }

  range_entries = (struct range_entry *)
      xmalloc (sizeof (*range_entries) * num_range_list);
  range_entry_fill = range_entries;

  for (i = 0; i < num_debug_info_entries; i++)
    {
      debug_info *debug_info_p = &debug_information[i];
      unsigned int j;

      for (j = 0; j < debug_info_p->num_range_lists; j++)
        {
          range_entry_fill->ranges_offset = debug_info_p->range_lists[j];
          range_entry_fill->debug_info_p = debug_info_p;
          range_entry_fill++;
        }
    }

  qsort (range_entries, num_range_list, sizeof (*range_entries),
         range_entry_compar);

  if (dwarf_check != 0 && range_entries[0].ranges_offset != 0)
    warn (_("Range lists in %s section start at %#" PRIx64 "\n"),
          section->name, range_entries[0].ranges_offset);

  putchar ('\n');
  printf (_("    Offset   Begin    End\n"));

  for (i = 0; i < num_range_list; i++)
    {
      struct range_entry *range_entry = &range_entries[i];
      debug_info *debug_info_p = range_entry->debug_info_p;
      unsigned int pointer_size;
      uint64_t offset;
      unsigned char *next;
      uint64_t base_address;

      pointer_size = (is_rnglists ? address_size : debug_info_p->pointer_size);
      offset = range_entry->ranges_offset;
      base_address = debug_info_p->base_address;

      /* PR 17512: file: 001-101485-0.001:0.1.  */
      if (pointer_size < 2 || pointer_size > 8)
        {
          warn (_("Corrupt pointer size (%d) in debug entry at offset %#" PRIx64 "\n"),
                pointer_size, offset);
          continue;
        }

      if (offset > (size_t) (finish - section_begin))
        {
          warn (_("Corrupt offset (%#" PRIx64 ") in range entry %u\n"),
                offset, i);
          continue;
        }

      next = section_begin + offset + debug_info_p->rnglists_base;

      /* If multiple DWARF entities reference the same range then we will
         have multiple entries in the `range_entries' list for the same
         offset.  Thanks to the sort above these will all be consecutive in
         the `range_entries' list, so we can easily ignore duplicates
         here.  */
      if (i > 0 && last_offset == offset)
        continue;
      last_offset = offset;

      if (dwarf_check != 0 && i > 0)
        {
          if (start < next)
            warn (_("There is a hole [%#tx - %#tx] in %s section.\n"),
                  start - section_begin, next - section_begin, section->name);
          else if (start > next)
            {
              if (next == last_start)
                continue;
              warn (_("There is an overlap [%#tx - %#tx] in %s section.\n"),
                    start - section_begin, next - section_begin, section->name);
            }
        }

      start = next;
      last_start = next;

      display_debug_ranges_list
        (start, finish, pointer_size, offset, base_address);
    }
  putchar ('\n');

  free (range_entries);

  return 1;
}

typedef struct Frame_Chunk
{
  struct Frame_Chunk *next;
  unsigned char *chunk_start;
  unsigned int ncols;
  /* DW_CFA_{undefined,same_value,offset,register,unreferenced}  */
  short int *col_type;
  int64_t *col_offset;
  char *augmentation;
  unsigned int code_factor;
  int data_factor;
  uint64_t pc_begin;
  uint64_t pc_range;
  unsigned int cfa_reg;
  uint64_t cfa_offset;
  unsigned int ra;
  unsigned char fde_encoding;
  unsigned char cfa_exp;
  unsigned char ptr_size;
  unsigned char segment_size;
}
Frame_Chunk;

typedef const char *(*dwarf_regname_lookup_ftype) (unsigned int);
static dwarf_regname_lookup_ftype dwarf_regnames_lookup_func;
static const char *const *dwarf_regnames;
static unsigned int dwarf_regnames_count;
static bool is_aarch64;

/* A marker for a col_type that means this column was never referenced
   in the frame info.  */
#define DW_CFA_unreferenced (-1)

/* Return 0 if no more space is needed, 1 if more space is needed,
   -1 for invalid reg.  */

static int
frame_need_space (Frame_Chunk *fc, unsigned int reg)
{
  unsigned int prev = fc->ncols;

  if (reg < (unsigned int) fc->ncols)
    return 0;

  if (dwarf_regnames_count > 0
      && reg > dwarf_regnames_count)
    return -1;

  fc->ncols = reg + 1;
  /* PR 17512: file: 10450-2643-0.004.
     If reg == -1 then this can happen...  */
  if (fc->ncols == 0)
    return -1;

  /* PR 17512: file: 2844a11d.  */
  if (fc->ncols > 1024 && dwarf_regnames_count == 0)
    {
      error (_("Unfeasibly large register number: %u\n"), reg);
      fc->ncols = 0;
      /* FIXME: 1024 is an arbitrary limit.  Increase it if
         we ever encounter a valid binary that exceeds it.  */
      return -1;
    }

  fc->col_type = xcrealloc (fc->col_type, fc->ncols,
                            sizeof (*fc->col_type));
  fc->col_offset = xcrealloc (fc->col_offset, fc->ncols,
                              sizeof (*fc->col_offset));
  /* PR 17512: file:002-10025-0.005.  */
  if (fc->col_type == NULL || fc->col_offset == NULL)
    {
      error (_("Out of memory allocating %u columns in dwarf frame arrays\n"),
             fc->ncols);
      fc->ncols = 0;
      return -1;
    }

  while (prev < fc->ncols)
    {
      fc->col_type[prev] = DW_CFA_unreferenced;
      fc->col_offset[prev] = 0;
      prev++;
    }
  return 1;
}

static const char *const dwarf_regnames_i386[] =
{
  "eax", "ecx", "edx", "ebx",                     /* 0 - 3  */
  "esp", "ebp", "esi", "edi",                     /* 4 - 7  */
  "eip", "eflags", NULL,                          /* 8 - 10  */
  "st0", "st1", "st2", "st3",                     /* 11 - 14  */
  "st4", "st5", "st6", "st7",                     /* 15 - 18  */
  NULL, NULL,                                     /* 19 - 20  */
  "xmm0", "xmm1", "xmm2", "xmm3",                 /* 21 - 24  */
  "xmm4", "xmm5", "xmm6", "xmm7",                 /* 25 - 28  */
  "mm0", "mm1", "mm2", "mm3",                     /* 29 - 32  */
  "mm4", "mm5", "mm6", "mm7",                     /* 33 - 36  */
  "fcw", "fsw", "mxcsr",                          /* 37 - 39  */
  "es", "cs", "ss", "ds", "fs", "gs", NULL, NULL, /* 40 - 47  */
  "tr", "ldtr",                                   /* 48 - 49  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 50 - 57  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 58 - 65  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 66 - 73  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 74 - 81  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 82 - 89  */
  NULL, NULL, NULL,                               /* 90 - 92  */
  "k0", "k1", "k2", "k3", "k4", "k5", "k6", "k7"  /* 93 - 100  */
};

static const char *const dwarf_regnames_iamcu[] =
{
  "eax", "ecx", "edx", "ebx",                     /* 0 - 3  */
  "esp", "ebp", "esi", "edi",                     /* 4 - 7  */
  "eip", "eflags", NULL,                          /* 8 - 10  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 11 - 18  */
  NULL, NULL,                                     /* 19 - 20  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 21 - 28  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 29 - 36  */
  NULL, NULL, NULL,                               /* 37 - 39  */
  "es", "cs", "ss", "ds", "fs", "gs", NULL, NULL, /* 40 - 47  */
  "tr", "ldtr",                                   /* 48 - 49  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 50 - 57  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 58 - 65  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 66 - 73  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 74 - 81  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 82 - 89  */
  NULL, NULL, NULL,                               /* 90 - 92  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL  /* 93 - 100  */
};

static void
init_dwarf_regnames_i386 (void)
{
  dwarf_regnames = dwarf_regnames_i386;
  dwarf_regnames_count = ARRAY_SIZE (dwarf_regnames_i386);
  dwarf_regnames_lookup_func = regname_internal_by_table_only;
}

static void
init_dwarf_regnames_iamcu (void)
{
  dwarf_regnames = dwarf_regnames_iamcu;
  dwarf_regnames_count = ARRAY_SIZE (dwarf_regnames_iamcu);
  dwarf_regnames_lookup_func = regname_internal_by_table_only;
}

static const char *const DW_CFA_GNU_window_save_name[] =
{
  "DW_CFA_GNU_window_save",
  "DW_CFA_AARCH64_negate_ra_state"
};

static const char *const dwarf_regnames_x86_64[] =
{
  "rax", "rdx", "rcx", "rbx",
  "rsi", "rdi", "rbp", "rsp",
  "r8",  "r9",  "r10", "r11",
  "r12", "r13", "r14", "r15",
  "rip",
  "xmm0",  "xmm1",  "xmm2",  "xmm3",
  "xmm4",  "xmm5",  "xmm6",  "xmm7",
  "xmm8",  "xmm9",  "xmm10", "xmm11",
  "xmm12", "xmm13", "xmm14", "xmm15",
  "st0", "st1", "st2", "st3",
  "st4", "st5", "st6", "st7",
  "mm0", "mm1", "mm2", "mm3",
  "mm4", "mm5", "mm6", "mm7",
  "rflags",
  "es", "cs", "ss", "ds", "fs", "gs", NULL, NULL,
  "fs.base", "gs.base", NULL, NULL,
  "tr", "ldtr",
  "mxcsr", "fcw", "fsw",
  "xmm16",  "xmm17",  "xmm18",  "xmm19",
  "xmm20",  "xmm21",  "xmm22",  "xmm23",
  "xmm24",  "xmm25",  "xmm26",  "xmm27",
  "xmm28",  "xmm29",  "xmm30",  "xmm31",
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 83 - 90  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 91 - 98  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 99 - 106  */
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, /* 107 - 114  */
  NULL, NULL, NULL,                               /* 115 - 117  */
  "k0", "k1", "k2", "k3", "k4", "k5", "k6", "k7"
};

static void
init_dwarf_regnames_x86_64 (void)
{
  dwarf_regnames = dwarf_regnames_x86_64;
  dwarf_regnames_count = ARRAY_SIZE (dwarf_regnames_x86_64);
  dwarf_regnames_lookup_func = regname_internal_by_table_only;
}

static const char *const dwarf_regnames_aarch64[] =
{
   "x0",  "x1",  "x2",  "x3",  "x4",  "x5",  "x6",  "x7",
   "x8",  "x9", "x10", "x11", "x12", "x13", "x14", "x15",
  "x16", "x17", "x18", "x19", "x20", "x21", "x22", "x23",
  "x24", "x25", "x26", "x27", "x28", "x29", "x30", "sp",
   NULL, "elr",  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
   NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  "vg", "ffr",
   "p0",  "p1",  "p2",  "p3",  "p4",  "p5",  "p6",  "p7",
   "p8",  "p9", "p10", "p11", "p12", "p13", "p14", "p15",
   "v0",  "v1",  "v2",  "v3",  "v4",  "v5",  "v6",  "v7",
   "v8",  "v9", "v10", "v11", "v12", "v13", "v14", "v15",
  "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23",
  "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31",
   "z0",  "z1",  "z2",  "z3",  "z4",  "z5",  "z6",  "z7",
   "z8",  "z9", "z10", "z11", "z12", "z13", "z14", "z15",
  "z16", "z17", "z18", "z19", "z20", "z21", "z22", "z23",
  "z24", "z25", "z26", "z27", "z28", "z29", "z30", "z31",
};

static void
init_dwarf_regnames_aarch64 (void)
{
  dwarf_regnames = dwarf_regnames_aarch64;
  dwarf_regnames_count = ARRAY_SIZE (dwarf_regnames_aarch64);
  dwarf_regnames_lookup_func = regname_internal_by_table_only;
  is_aarch64 = true;
}

static const char *const dwarf_regnames_s390[] =
{
  /* Avoid saying "r5 (r5)", so omit the names of r0-r15.  */
  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,
  "f0",  "f2",  "f4",  "f6",  "f1",  "f3",  "f5",  "f7",
  "f8",  "f10", "f12", "f14", "f9",  "f11", "f13", "f15",
  "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",
  "cr8", "cr9", "cr10", "cr11", "cr12", "cr13", "cr14", "cr15",
  "a0",  "a1",  "a2",  "a3",  "a4",  "a5",  "a6",  "a7",
  "a8",  "a9",  "a10", "a11", "a12", "a13", "a14", "a15",
  "pswm", "pswa",
  NULL, NULL,
  "v16", "v18", "v20", "v22", "v17", "v19", "v21", "v23",
  "v24", "v26", "v28", "v30", "v25", "v27", "v29", "v31",
};

static void
init_dwarf_regnames_s390 (void)
{
  dwarf_regnames = dwarf_regnames_s390;
  dwarf_regnames_count = ARRAY_SIZE (dwarf_regnames_s390);
  dwarf_regnames_lookup_func = regname_internal_by_table_only;
}

static const char *const dwarf_regnames_riscv[] =
{
 "zero", "ra",   "sp",   "gp",  "tp",  "t0",  "t1",  "t2",  /*   0 -   7 */
 "s0",   "s1",   "a0",   "a1",  "a2",  "a3",  "a4",  "a5",  /*   8 -  15 */
 "a6",   "a7",   "s2",   "s3",  "s4",  "s5",  "s6",  "s7",  /*  16 -  23 */
 "s8",   "s9",   "s10",  "s11", "t3",  "t4",  "t5",  "t6",  /*  24 -  31 */
 "ft0",  "ft1",  "ft2",  "ft3", "ft4", "ft5", "ft6", "ft7", /*  32 -  39 */
 "fs0",  "fs1",                                             /*  40 -  41 */
 "fa0",  "fa1",  "fa2",  "fa3", "fa4", "fa5", "fa6", "fa7", /*  42 -  49 */
 "fs2",  "fs3",  "fs4",  "fs5", "fs6", "fs7", "fs8", "fs9", /*  50 -  57 */
 "fs10", "fs11",                                            /*  58 -  59 */
 "ft8",  "ft9",  "ft10", "ft11",                            /*  60 -  63 */
 NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,     /*  64 -  71 */
 NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,     /*  72 -  79 */
 NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,     /*  80 -  87 */
 NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,  NULL,     /*  88 -  95 */
 "v0",  "v1",  "v2",  "v3",  "v4",  "v5",  "v6",  "v7",     /*  96 - 103 */
 "v8",  "v9",  "v10", "v11", "v12", "v13", "v14", "v15",    /* 104 - 111 */
 "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23",    /* 112 - 119 */
 "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31",    /* 120 - 127 */
};

/* A RISC-V replacement for REGNAME_INTERNAL_BY_TABLE_ONLY which handles
   the large number of CSRs.  */

static const char *
regname_internal_riscv (unsigned int regno)
{
  const char *name = NULL;

  /* Lookup in the table first, this covers GPR and FPR.  */
  if (regno < ARRAY_SIZE (dwarf_regnames_riscv))
    name = dwarf_regnames_riscv [regno];
  else if (regno >= 4096 && regno <= 8191)
    {
      /* This might be a CSR, these live in a sparse number space from 4096
         to 8191  These numbers are defined in the RISC-V ELF ABI
         document.  */
      switch (regno)
        {
#define DECLARE_CSR(NAME,VALUE,CLASS,DEFINE_VER,ABORT_VER) \
  case VALUE + 4096: name = #NAME; break;
#include "opcode/riscv-opc.h"
#undef DECLARE_CSR

        default:
          {
            static char csr_name[10];
            snprintf (csr_name, sizeof (csr_name), "csr%d", (regno - 4096));
            name = csr_name;
          }
          break;
        }
    }

  return name;
}

static void
init_dwarf_regnames_riscv (void)
{
  dwarf_regnames = NULL;
  dwarf_regnames_count = 8192;
  dwarf_regnames_lookup_func = regname_internal_riscv;
}

void
init_dwarf_regnames_by_elf_machine_code (unsigned int e_machine)
{
  dwarf_regnames_lookup_func = NULL;
  is_aarch64 = false;

  switch (e_machine)
    {
    case EM_386:
      init_dwarf_regnames_i386 ();
      break;

    case EM_IAMCU:
      init_dwarf_regnames_iamcu ();
      break;

    case EM_X86_64:
    case EM_L1OM:
    case EM_K1OM:
      init_dwarf_regnames_x86_64 ();
      break;

    case EM_AARCH64:
      init_dwarf_regnames_aarch64 ();
      break;

    case EM_S390:
      init_dwarf_regnames_s390 ();
      break;

    case EM_RISCV:
      init_dwarf_regnames_riscv ();
      break;

    default:
      break;
    }
}

/* Initialize the DWARF register name lookup state based on the
   architecture and specific machine type of a BFD.  */

void
init_dwarf_regnames_by_bfd_arch_and_mach (enum bfd_architecture arch,
                                          unsigned long mach)
{
  dwarf_regnames_lookup_func = NULL;
  is_aarch64 = false;

  switch (arch)
    {
    case bfd_arch_i386:
      switch (mach)
        {
        case bfd_mach_x86_64:
        case bfd_mach_x86_64_intel_syntax:
        case bfd_mach_x64_32:
        case bfd_mach_x64_32_intel_syntax:
          init_dwarf_regnames_x86_64 ();
          break;

        default:
          init_dwarf_regnames_i386 ();
          break;
        }
      break;

    case bfd_arch_iamcu:
      init_dwarf_regnames_iamcu ();
      break;

    case bfd_arch_aarch64:
      init_dwarf_regnames_aarch64();
      break;

    case bfd_arch_s390:
      init_dwarf_regnames_s390 ();
      break;

    case bfd_arch_riscv:
      init_dwarf_regnames_riscv ();
      break;

    default:
      break;
    }
}

static const char *
regname_internal_by_table_only (unsigned int regno)
{
  if (dwarf_regnames != NULL
      && regno < dwarf_regnames_count
      && dwarf_regnames [regno] != NULL)
    return dwarf_regnames [regno];

  return NULL;
}

static const char *
regname (unsigned int regno, int name_only_p)
{
  static char reg[64];

  const char *name = NULL;

  if (dwarf_regnames_lookup_func != NULL)
    name = dwarf_regnames_lookup_func (regno);

  if (name != NULL)
    {
      if (name_only_p)
        return name;
      snprintf (reg, sizeof (reg), "r%d (%s)", regno, name);
    }
  else
    snprintf (reg, sizeof (reg), "r%d", regno);
  return reg;
}

static void
frame_display_row (Frame_Chunk *fc, int *need_col_headers, unsigned int *max_regs)
{
  unsigned int r;
  char tmp[100];

  if (*max_regs != fc->ncols)
    *max_regs = fc->ncols;

  if (*need_col_headers)
    {
      *need_col_headers = 0;

      printf ("%-*s CFA      ", eh_addr_size * 2, "   LOC");

      for (r = 0; r < *max_regs; r++)
        if (fc->col_type[r] != DW_CFA_unreferenced)
          {
            if (r == fc->ra)
              printf ("ra    ");
            else
              printf ("%-5s ", regname (r, 1));
          }

      printf ("\n");
    }

  print_hex (fc->pc_begin, eh_addr_size);
  if (fc->cfa_exp)
    strcpy (tmp, "exp");
  else
    sprintf (tmp, "%s%+d", regname (fc->cfa_reg, 1), (int) fc->cfa_offset);
  printf ("%-8s ", tmp);

  for (r = 0; r < fc->ncols; r++)
    {
      if (fc->col_type[r] != DW_CFA_unreferenced)
        {
          switch (fc->col_type[r])
            {
            case DW_CFA_undefined:
              strcpy (tmp, "u");
              break;
            case DW_CFA_same_value:
              strcpy (tmp, "s");
              break;
            case DW_CFA_offset:
              sprintf (tmp, "c%+" PRId64, fc->col_offset[r]);
              break;
            case DW_CFA_val_offset:
              sprintf (tmp, "v%+" PRId64, fc->col_offset[r]);
              break;
            case DW_CFA_register:
              sprintf (tmp, "%s", regname (fc->col_offset[r], 0));
              break;
            case DW_CFA_expression:
              strcpy (tmp, "exp");
              break;
            case DW_CFA_val_expression:
              strcpy (tmp, "vexp");
              break;
            default:
              strcpy (tmp, "n/a");
              break;
            }
          printf ("%-5s ", tmp);
        }
    }
  printf ("\n");
}

#define GET(VAR, N)     SAFE_BYTE_GET_AND_INC (VAR, start, N, end)

static unsigned char *
read_cie (unsigned char *start, unsigned char *end,
          Frame_Chunk **p_cie, int *p_version,
          uint64_t *p_aug_len, unsigned char **p_aug)
{
  int version;
  Frame_Chunk *fc;
  unsigned char *augmentation_data = NULL;
  uint64_t augmentation_data_len = 0;

  * p_cie = NULL;
  /* PR 17512: file: 001-228113-0.004.  */
  if (start >= end)
    return end;

  fc = (Frame_Chunk *) xmalloc (sizeof (Frame_Chunk));
  memset (fc, 0, sizeof (Frame_Chunk));

  fc->col_type = xmalloc (sizeof (*fc->col_type));
  fc->col_offset = xmalloc (sizeof (*fc->col_offset));

  version = *start++;

  fc->augmentation = (char *) start;
  /* PR 17512: file: 001-228113-0.004.
     Skip past augmentation name, but avoid running off the end of the data.  */
  while (start < end)
    if (* start ++ == '\0')
      break;
  if (start == end)
    {
      warn (_("No terminator for augmentation name\n"));
      goto fail;
    }

  if (strcmp (fc->augmentation, "eh") == 0)
    {
      if (eh_addr_size > (size_t) (end - start))
        goto fail;
      start += eh_addr_size;
    }

  if (version >= 4)
    {
      if (2 > (size_t) (end - start))
        goto fail;
      GET (fc->ptr_size, 1);
      if (fc->ptr_size < 1 || fc->ptr_size > 8)
        {
          warn (_("Invalid pointer size (%d) in CIE data\n"), fc->ptr_size);
          goto fail;
        }

      GET (fc->segment_size, 1);
      /* PR 17512: file: e99d2804.  */
      if (fc->segment_size > 8 || fc->segment_size + fc->ptr_size > 8)
        {
          warn (_("Invalid segment size (%d) in CIE data\n"), fc->segment_size);
          goto fail;
        }

      eh_addr_size = fc->ptr_size;
    }
  else
    {
      fc->ptr_size = eh_addr_size;
      fc->segment_size = 0;
    }

  READ_ULEB (fc->code_factor, start, end);
  READ_SLEB (fc->data_factor, start, end);

  if (start >= end)
    goto fail;

  if (version == 1)
    {
      GET (fc->ra, 1);
    }
  else
    {
      READ_ULEB (fc->ra, start, end);
    }

  if (fc->augmentation[0] == 'z')
    {
      if (start >= end)
        goto fail;
      READ_ULEB (augmentation_data_len, start, end);
      augmentation_data = start;
      /* PR 17512: file: 11042-2589-0.004.  */
      if (augmentation_data_len > (size_t) (end - start))
        {
          warn (_("Augmentation data too long: %#" PRIx64
                  ", expected at most %#tx\n"),
                augmentation_data_len, end - start);
          goto fail;
        }
      start += augmentation_data_len;
    }

  if (augmentation_data_len)
    {
      unsigned char *p;
      unsigned char *q;
      unsigned char *qend;

      p = (unsigned char *) fc->augmentation + 1;
      q = augmentation_data;
      qend = q + augmentation_data_len;

      while (p < end && q < qend)
        {
          if (*p == 'L')
            q++;
          else if (*p == 'P')
            q += 1 + size_of_encoded_value (*q);
          else if (*p == 'R')
            fc->fde_encoding = *q++;
          else if (*p == 'S')
            ;
          else if (*p == 'B')
            ;
          else
            break;
          p++;
        }
      /* Note - it is OK if this loop terminates with q < qend.
         Padding may have been inserted to align the end of the CIE.  */
    }

  *p_cie = fc;
  if (p_version)
    *p_version = version;
  if (p_aug_len)
    {
      *p_aug_len = augmentation_data_len;
      *p_aug = augmentation_data;
    }
  return start;

 fail:
  free (fc->col_offset);
  free (fc->col_type);
  free (fc);
  return end;
}

/* Prints out the contents on the DATA array formatted as unsigned bytes.
   If do_wide is not enabled, then formats the output to fit into 80 columns.
   PRINTED contains the number of characters already written to the current
   output line.  */

static void
display_data (size_t printed, const unsigned char *data, size_t len)
{
  if (do_wide || len < ((80 - printed) / 3))
    for (printed = 0; printed < len; ++printed)
      printf (" %02x", data[printed]);
  else
    {
      for (printed = 0; printed < len; ++printed)
        {
          if (printed % (80 / 3) == 0)
            putchar ('\n');
          printf (" %02x", data[printed]);
        }
    }
}

/* Prints out the contents on the augmentation data array.
   If do_wide is not enabled, then formats the output to fit into 80 columns.  */

static void
display_augmentation_data (const unsigned char * data, uint64_t len)
{
  size_t i;

  i = printf (_("  Augmentation data:    "));
  display_data (i, data, len);
}

static int
display_debug_frames (struct dwarf_section *section,
                      void *file ATTRIBUTE_UNUSED)
{
  unsigned char *start = section->start;
  unsigned char *end = start + section->size;
  unsigned char *section_start = start;
  Frame_Chunk *chunks = NULL, *forward_refs = NULL;
  Frame_Chunk *remembered_state = NULL;
  Frame_Chunk *rs;
  bool is_eh = strcmp (section->name, ".eh_frame") == 0;
  unsigned int max_regs = 0;
  const char *bad_reg = _("bad register: ");
  unsigned int saved_eh_addr_size = eh_addr_size;

  introduce (section, false);

  while (start < end)
    {
      unsigned char *saved_start;
      unsigned char *block_end;
      uint64_t length;
      uint64_t cie_id;
      Frame_Chunk *fc;
      Frame_Chunk *cie;
      int need_col_headers = 1;
      unsigned char *augmentation_data = NULL;
      uint64_t augmentation_data_len = 0;
      unsigned int encoded_ptr_size = saved_eh_addr_size;
      unsigned int offset_size;
      bool all_nops;
      static Frame_Chunk fde_fc;

      saved_start = start;

      SAFE_BYTE_GET_AND_INC (length, start, 4, end);

      if (length == 0)
        {
          printf ("\n%08tx ZERO terminator\n\n",
                    saved_start - section_start);
          /* Skip any zero terminators that directly follow.
             A corrupt section size could have loaded a whole
             slew of zero filled memory bytes.  eg
             PR 17512: file: 070-19381-0.004.  */
          while (start < end && * start == 0)
            ++ start;
          continue;
        }

      if (length == 0xffffffff)
        {
          SAFE_BYTE_GET_AND_INC (length, start, 8, end);
          offset_size = 8;
        }
      else
        offset_size = 4;

      if (length > (size_t) (end - start))
        {
          warn ("Invalid length %#" PRIx64 " in FDE at %#tx\n",
                length, saved_start - section_start);
          block_end = end;
        }
      else
        block_end = start + length;

      SAFE_BYTE_GET_AND_INC (cie_id, start, offset_size, block_end);

      if (is_eh ? (cie_id == 0) : ((offset_size == 4 && cie_id == DW_CIE_ID)
                                   || (offset_size == 8 && cie_id == DW64_CIE_ID)))
        {
          int version;
          unsigned int mreg;

          start = read_cie (start, block_end, &cie, &version,
                            &augmentation_data_len, &augmentation_data);
          /* PR 17512: file: 027-135133-0.005.  */
          if (cie == NULL)
            break;

          fc = cie;
          fc->next = chunks;
          chunks = fc;
          fc->chunk_start = saved_start;
          mreg = max_regs > 0 ? max_regs - 1 : 0;
          if (mreg < fc->ra)
            mreg = fc->ra;
          if (frame_need_space (fc, mreg) < 0)
            break;
          if (fc->fde_encoding)
            encoded_ptr_size = size_of_encoded_value (fc->fde_encoding);

          printf ("\n%08tx ", saved_start - section_start);
          print_hex (length, fc->ptr_size);
          print_hex (cie_id, offset_size);

          if (do_debug_frames_interp)
            {
              printf ("CIE \"%s\" cf=%d df=%d ra=%d\n", fc->augmentation,
                      fc->code_factor, fc->data_factor, fc->ra);
            }
          else
            {
              printf ("CIE\n");
              printf ("  Version:               %d\n", version);
              printf ("  Augmentation:          \"%s\"\n", fc->augmentation);
              if (version >= 4)
                {
                  printf ("  Pointer Size:          %u\n", fc->ptr_size);
                  printf ("  Segment Size:          %u\n", fc->segment_size);
                }
              printf ("  Code alignment factor: %u\n", fc->code_factor);
              printf ("  Data alignment factor: %d\n", fc->data_factor);
              printf ("  Return address column: %d\n", fc->ra);

              if (augmentation_data_len)
                display_augmentation_data (augmentation_data, augmentation_data_len);

              putchar ('\n');
            }
        }
      else
        {
          unsigned char *look_for;
          unsigned long segment_selector;
          uint64_t cie_off;

          cie_off = cie_id;
          if (is_eh)
            {
              uint64_t sign = (uint64_t) 1 << (offset_size * 8 - 1);
              cie_off = (cie_off ^ sign) - sign;
              cie_off = start - 4 - section_start - cie_off;
            }

          look_for = section_start + cie_off;
          if (cie_off <= (size_t) (saved_start - section_start))
            {
              for (cie = chunks; cie ; cie = cie->next)
                if (cie->chunk_start == look_for)
                  break;
            }
          else if (cie_off >= section->size)
            cie = NULL;
          else
            {
              for (cie = forward_refs; cie ; cie = cie->next)
                if (cie->chunk_start == look_for)
                  break;
              if (!cie)
                {
                  unsigned int off_size;
                  unsigned char *cie_scan;

                  cie_scan = look_for;
                  off_size = 4;
                  SAFE_BYTE_GET_AND_INC (length, cie_scan, 4, end);
                  if (length == 0xffffffff)
                    {
                      SAFE_BYTE_GET_AND_INC (length, cie_scan, 8, end);
                      off_size = 8;
                    }
                  if (length != 0 && length <= (size_t) (end - cie_scan))
                    {
                      uint64_t c_id;
                      unsigned char *cie_end = cie_scan + length;

                      SAFE_BYTE_GET_AND_INC (c_id, cie_scan, off_size,
                                             cie_end);
                      if (is_eh
                          ? c_id == 0
                          : ((off_size == 4 && c_id == DW_CIE_ID)
                             || (off_size == 8 && c_id == DW64_CIE_ID)))
                        {
                          int version;
                          unsigned int mreg;

                          read_cie (cie_scan, cie_end, &cie, &version,
                                    &augmentation_data_len, &augmentation_data);
                          /* PR 17512: file: 3450-2098-0.004.  */
                          if (cie == NULL)
                            {
                              warn (_("Failed to read CIE information\n"));
                              break;
                            }
                          cie->next = forward_refs;
                          forward_refs = cie;
                          cie->chunk_start = look_for;
                          mreg = max_regs > 0 ? max_regs - 1 : 0;
                          if (mreg < cie->ra)
                            mreg = cie->ra;
                          if (frame_need_space (cie, mreg) < 0)
                            {
                              warn (_("Invalid max register\n"));
                              break;
                            }
                          if (cie->fde_encoding)
                            encoded_ptr_size
                              = size_of_encoded_value (cie->fde_encoding);
                        }
                    }
                }
            }

          fc = &fde_fc;
          memset (fc, 0, sizeof (Frame_Chunk));

          if (!cie)
            {
              fc->ncols = 0;
              fc->col_type = xmalloc (sizeof (*fc->col_type));
              fc->col_offset = xmalloc (sizeof (*fc->col_offset));
              if (frame_need_space (fc, max_regs > 0 ? max_regs - 1 : 0) < 0)
                {
                  warn (_("Invalid max register\n"));
                  break;
                }
              cie = fc;
              fc->augmentation = "";
              fc->fde_encoding = 0;
              fc->ptr_size = eh_addr_size;
              fc->segment_size = 0;
            }
          else
            {
              fc->ncols = cie->ncols;
              fc->col_type = xcmalloc (fc->ncols, sizeof (*fc->col_type));
              fc->col_offset =  xcmalloc (fc->ncols, sizeof (*fc->col_offset));
              memcpy (fc->col_type, cie->col_type,
                      fc->ncols * sizeof (*fc->col_type));
              memcpy (fc->col_offset, cie->col_offset,
                      fc->ncols * sizeof (*fc->col_offset));
              fc->augmentation = cie->augmentation;
              fc->ptr_size = cie->ptr_size;
              eh_addr_size = cie->ptr_size;
              fc->segment_size = cie->segment_size;
              fc->code_factor = cie->code_factor;
              fc->data_factor = cie->data_factor;
              fc->cfa_reg = cie->cfa_reg;
              fc->cfa_offset = cie->cfa_offset;
              fc->ra = cie->ra;
              if (frame_need_space (fc, max_regs > 0 ? max_regs - 1: 0) < 0)
                {
                  warn (_("Invalid max register\n"));
                  break;
                }
              fc->fde_encoding = cie->fde_encoding;
            }

          if (fc->fde_encoding)
            encoded_ptr_size = size_of_encoded_value (fc->fde_encoding);

          segment_selector = 0;
          if (fc->segment_size)
            {
              if (fc->segment_size > sizeof (segment_selector))
                {
                  /* PR 17512: file: 9e196b3e.  */
                  warn (_("Probably corrupt segment size: %d - using 4 instead\n"), fc->segment_size);
                  fc->segment_size = 4;
                }
              SAFE_BYTE_GET_AND_INC (segment_selector, start,
                                     fc->segment_size, block_end);
            }

          fc->pc_begin = get_encoded_value (&start, fc->fde_encoding, section,
                                            block_end);

          /* FIXME: It appears that sometimes the final pc_range value is
             encoded in less than encoded_ptr_size bytes.  See the x86_64
             run of the "objcopy on compressed debug sections" test for an
             example of this.  */
          SAFE_BYTE_GET_AND_INC (fc->pc_range, start, encoded_ptr_size,
                                 block_end);

          if (cie->augmentation[0] == 'z')
            {
              READ_ULEB (augmentation_data_len, start, block_end);
              augmentation_data = start;
              /* PR 17512 file: 722-8446-0.004 and PR 22386.  */
              if (augmentation_data_len > (size_t) (block_end - start))
                {
                  warn (_("Augmentation data too long: %#" PRIx64 ", "
                          "expected at most %#tx\n"),
                        augmentation_data_len, block_end - start);
                  start = block_end;
                  augmentation_data = NULL;
                  augmentation_data_len = 0;
                }
              start += augmentation_data_len;
            }

          printf ("\n%08tx ", saved_start - section_start);
          print_hex (length, fc->ptr_size);
          print_hex (cie_id, offset_size);
          printf ("FDE ");

          if (cie->chunk_start)
            printf ("cie=%08tx", cie->chunk_start - section_start);
          else
            /* Ideally translate "invalid " to 8 chars, trailing space
               is optional.  */
            printf (_("cie=invalid "));

          printf (" pc=");
          if (fc->segment_size)
            printf ("%04lx:", segment_selector);

          print_hex_ns (fc->pc_begin, fc->ptr_size);
          printf ("..");
          print_hex_ns (fc->pc_begin + fc->pc_range, fc->ptr_size);
          printf ("\n");

          if (! do_debug_frames_interp && augmentation_data_len)
            {
              display_augmentation_data (augmentation_data, augmentation_data_len);
              putchar ('\n');
            }
        }

      /* At this point, fc is the current chunk, cie (if any) is set, and
         we're about to interpret instructions for the chunk.  */
      /* ??? At present we need to do this always, since this sizes the
         fc->col_type and fc->col_offset arrays, which we write into always.
         We should probably split the interpreted and non-interpreted bits
         into two different routines, since there's so much that doesn't
         really overlap between them.  */
      if (1 || do_debug_frames_interp)
        {
          /* Start by making a pass over the chunk, allocating storage
             and taking note of what registers are used.  */
          unsigned char *tmp = start;

          while (start < block_end)
            {
              unsigned int reg, op, opa;
              unsigned long temp;

              op = *start++;
              opa = op & 0x3f;
              if (op & 0xc0)
                op &= 0xc0;

              /* Warning: if you add any more cases to this switch, be
                 sure to add them to the corresponding switch below.  */
              reg = -1u;
              switch (op)
                {
                case DW_CFA_advance_loc:
                  break;
                case DW_CFA_offset:
                  SKIP_ULEB (start, block_end);
                  reg = opa;
                  break;
                case DW_CFA_restore:
                  reg = opa;
                  break;
                case DW_CFA_set_loc:
                  if ((size_t) (block_end - start) < encoded_ptr_size)
                    start = block_end;
                  else
                    start += encoded_ptr_size;
                  break;
                case DW_CFA_advance_loc1:
                  if ((size_t) (block_end - start) < 1)
                    start = block_end;
                  else
                    start += 1;
                  break;
                case DW_CFA_advance_loc2:
                  if ((size_t) (block_end - start) < 2)
                    start = block_end;
                  else
                    start += 2;
                  break;
                case DW_CFA_advance_loc4:
                  if ((size_t) (block_end - start) < 4)
                    start = block_end;
                  else
                    start += 4;
                  break;
                case DW_CFA_offset_extended:
                case DW_CFA_val_offset:
                  READ_ULEB (reg, start, block_end);
                  SKIP_ULEB (start, block_end);
                  break;
                case DW_CFA_restore_extended:
                  READ_ULEB (reg, start, block_end);
                  break;
                case DW_CFA_undefined:
                  READ_ULEB (reg, start, block_end);
                  break;
                case DW_CFA_same_value:
                  READ_ULEB (reg, start, block_end);
                  break;
                case DW_CFA_register:
                  READ_ULEB (reg, start, block_end);
                  SKIP_ULEB (start, block_end);
                  break;
                case DW_CFA_def_cfa:
                  SKIP_ULEB (start, block_end);
                  SKIP_ULEB (start, block_end);
                  break;
                case DW_CFA_def_cfa_register:
                  SKIP_ULEB (start, block_end);
                  break;
                case DW_CFA_def_cfa_offset:
                  SKIP_ULEB (start, block_end);
                  break;
                case DW_CFA_def_cfa_expression:
                  READ_ULEB (temp, start, block_end);
                  if ((size_t) (block_end - start) < temp)
                    start = block_end;
                  else
                    start += temp;
                  break;
                case DW_CFA_expression:
                case DW_CFA_val_expression:
                  READ_ULEB (reg, start, block_end);
                  READ_ULEB (temp, start, block_end);
                  if ((size_t) (block_end - start) < temp)
                    start = block_end;
                  else
                    start += temp;
                  break;
                case DW_CFA_offset_extended_sf:
                case DW_CFA_val_offset_sf:
                  READ_ULEB (reg, start, block_end);
                  SKIP_SLEB (start, block_end);
                  break;
                case DW_CFA_def_cfa_sf:
                  SKIP_ULEB (start, block_end);
                  SKIP_SLEB (start, block_end);
                  break;
                case DW_CFA_def_cfa_offset_sf:
                  SKIP_SLEB (start, block_end);
                  break;
                case DW_CFA_MIPS_advance_loc8:
                  if ((size_t) (block_end - start) < 8)
                    start = block_end;
                  else
                    start += 8;
                  break;
                case DW_CFA_GNU_args_size:
                  SKIP_ULEB (start, block_end);
                  break;
                case DW_CFA_GNU_negative_offset_extended:
                  READ_ULEB (reg, start, block_end);
                  SKIP_ULEB (start, block_end);
                  break;
                default:
                  break;
                }
              if (reg != -1u && frame_need_space (fc, reg) >= 0)
                {
                  /* Don't leave any reg as DW_CFA_unreferenced so
                     that frame_display_row prints name of regs in
                     header, and all referenced regs in each line.  */
                  if (reg >= cie->ncols
                      || cie->col_type[reg] == DW_CFA_unreferenced)
                    fc->col_type[reg] = DW_CFA_undefined;
                  else
                    fc->col_type[reg] = cie->col_type[reg];
                }
            }
          start = tmp;
        }

      all_nops = true;

      /* Now we know what registers are used, make a second pass over
         the chunk, this time actually printing out the info.  */

      while (start < block_end)
        {
          unsigned op, opa;
          /* Note: It is tempting to use an unsigned long for 'reg' but there
             are various functions, notably frame_space_needed() that assume that
             reg is an unsigned int.  */
          unsigned int reg;
          int64_t sofs;
          uint64_t ofs;
          const char *reg_prefix = "";

          op = *start++;
          opa = op & 0x3f;
          if (op & 0xc0)
            op &= 0xc0;

          /* Make a note if something other than DW_CFA_nop happens.  */
          if (op != DW_CFA_nop)
            all_nops = false;

          /* Warning: if you add any more cases to this switch, be
             sure to add them to the corresponding switch above.  */
          switch (op)
            {
            case DW_CFA_advance_loc:
              opa *= fc->code_factor;
              if (do_debug_frames_interp)
                frame_display_row (fc, &need_col_headers, &max_regs);
              else
                {
                  printf ("  DW_CFA_advance_loc: %d to ", opa);
                  print_hex_ns (fc->pc_begin + opa, fc->ptr_size);
                  printf ("\n");
                }
              fc->pc_begin += opa;
              break;

            case DW_CFA_offset:
              READ_ULEB (ofs, start, block_end);
              ofs *= fc->data_factor;
              if (opa >= fc->ncols)
                reg_prefix = bad_reg;
              if (! do_debug_frames_interp || *reg_prefix != '\0')
                printf ("  DW_CFA_offset: %s%s at cfa%+" PRId64 "\n",
                        reg_prefix, regname (opa, 0), ofs);
              if (*reg_prefix == '\0')
                {
                  fc->col_type[opa] = DW_CFA_offset;
                  fc->col_offset[opa] = ofs;
                }
              break;

            case DW_CFA_restore:
              if (opa >= fc->ncols)
                reg_prefix = bad_reg;
              if (! do_debug_frames_interp || *reg_prefix != '\0')
                printf ("  DW_CFA_restore: %s%s\n",
                        reg_prefix, regname (opa, 0));
              if (*reg_prefix != '\0')
                break;

              if (opa >= cie->ncols
                  || cie->col_type[opa] == DW_CFA_unreferenced)
                {
                  fc->col_type[opa] = DW_CFA_undefined;
                  fc->col_offset[opa] = 0;
                }
              else
                {
                  fc->col_type[opa] = cie->col_type[opa];
                  fc->col_offset[opa] = cie->col_offset[opa];
                }
              break;

            case DW_CFA_set_loc:
              ofs = get_encoded_value (&start, fc->fde_encoding, section,
                                       block_end);
              if (do_debug_frames_interp)
                frame_display_row (fc, &need_col_headers, &max_regs);
              else
                {
                  printf ("  DW_CFA_set_loc: ");
                  print_hex_ns (ofs, fc->ptr_size);
                  printf ("\n");
                }
              fc->pc_begin = ofs;
              break;

            case DW_CFA_advance_loc1:
              SAFE_BYTE_GET_AND_INC (ofs, start, 1, block_end);
              ofs *= fc->code_factor;
              if (do_debug_frames_interp)
                frame_display_row (fc, &need_col_headers, &max_regs);
              else
                {
                  printf ("  DW_CFA_advance_loc1: %" PRId64 " to ", ofs);
                  print_hex_ns (fc->pc_begin + ofs, fc->ptr_size);
                  printf ("\n");
                }
              fc->pc_begin += ofs;
              break;

            case DW_CFA_advance_loc2:
              SAFE_BYTE_GET_AND_INC (ofs, start, 2, block_end);
              ofs *= fc->code_factor;
              if (do_debug_frames_interp)
                frame_display_row (fc, &need_col_headers, &max_regs);
              else
                {
                  printf ("  DW_CFA_advance_loc2: %" PRId64 " to ", ofs);
                  print_hex_ns (fc->pc_begin + ofs, fc->ptr_size);
                  printf ("\n");
                }
              fc->pc_begin += ofs;
              break;

            case DW_CFA_advance_loc4:
              SAFE_BYTE_GET_AND_INC (ofs, start, 4, block_end);
              ofs *= fc->code_factor;
              if (do_debug_frames_interp)
                frame_display_row (fc, &need_col_headers, &max_regs);
              else
                {
                  printf ("  DW_CFA_advance_loc4: %" PRId64 " to ", ofs);
                  print_hex_ns (fc->pc_begin + ofs, fc->ptr_size);
                  printf ("\n");
                }
              fc->pc_begin += ofs;
              break;

            case DW_CFA_offset_extended:
              READ_ULEB (reg, start, block_end);
              READ_ULEB (ofs, start, block_end);
              ofs *= fc->data_factor;
              if (reg >= fc->ncols)
                reg_prefix = bad_reg;
              if (! do_debug_frames_interp || *reg_prefix != '\0')
                printf ("  DW_CFA_offset_extended: %s%s at cfa%+" PRId64 "\n",
                        reg_prefix, regname (reg, 0), ofs);
              if (*reg_prefix == '\0')
                {
                  fc->col_type[reg] = DW_CFA_offset;
                  fc->col_offset[reg] = ofs;
                }
              break;

            case DW_CFA_val_offset:
              READ_ULEB (reg, start, block_end);
              READ_ULEB (ofs, start, block_end);
              ofs *= fc->data_factor;
              if (reg >= fc->ncols)
                reg_prefix = bad_reg;
              if (! do_debug_frames_interp || *reg_prefix != '\0')
                printf ("  DW_CFA_val_offset: %s%s is cfa%+" PRId64 "\n",
                        reg_prefix, regname (reg, 0), ofs);
              if (*reg_prefix == '\0')
                {
                  fc->col_type[reg] = DW_CFA_val_offset;
                  fc->col_offset[reg] = ofs;
                }
              break;

            case DW_CFA_restore_extended:
              READ_ULEB (reg, start, block_end);
              if (reg >= fc->ncols)
                reg_prefix = bad_reg;
              if (! do_debug_frames_interp || *reg_prefix != '\0')
                printf ("  DW_CFA_restore_extended: %s%s\n",
                        reg_prefix, regname (reg, 0));
              if (*reg_prefix != '\0')
                break;

              if (reg >= cie->ncols
                  || cie->col_type[reg] == DW_CFA_unreferenced)
                {
                  fc->col_type[reg] = DW_CFA_undefined;
                  fc->col_offset[reg] = 0;
                }
              else
                {
                  fc->col_type[reg] = cie->col_type[reg];
                  fc->col_offset[reg] = cie->col_offset[reg];
                }
              break;

            case DW_CFA_undefined:
              READ_ULEB (reg, start, block_end);
              if (reg >= fc->ncols)
                reg_prefix = bad_reg;
              if (! do_debug_frames_interp || *reg_prefix != '\0')
                printf ("  DW_CFA_undefined: %s%s\n",
                        reg_prefix, regname (reg, 0));
              if (*reg_prefix == '\0')
                {
                  fc->col_type[reg] = DW_CFA_undefined;
                  fc->col_offset[reg] = 0;
                }
              break;

            case DW_CFA_same_value:
              READ_ULEB (reg, start, block_end);
              if (reg >= fc->ncols)
                reg_prefix = bad_reg;
              if (! do_debug_frames_interp || *reg_prefix != '\0')
                printf ("  DW_CFA_same_value: %s%s\n",
                        reg_prefix, regname (reg, 0));
              if (*reg_prefix == '\0')
                {
                  fc->col_type[reg] = DW_CFA_same_value;
                  fc->col_offset[reg] = 0;
                }
              break;

            case DW_CFA_register:
              READ_ULEB (reg, start, block_end);
              READ_ULEB (ofs, start, block_end);
              if (reg >= fc->ncols)
                reg_prefix = bad_reg;
              if (! do_debug_frames_interp || *reg_prefix != '\0')
                {
                  printf ("  DW_CFA_register: %s%s in ",
                          reg_prefix, regname (reg, 0));
                  puts (regname (ofs, 0));
                }
              if (*reg_prefix == '\0')
                {
                  fc->col_type[reg] = DW_CFA_register;
                  fc->col_offset[reg] = ofs;
                }
              break;

            case DW_CFA_remember_state:
              if (! do_debug_frames_interp)
                printf ("  DW_CFA_remember_state\n");
              rs = (Frame_Chunk *) xmalloc (sizeof (Frame_Chunk));
              rs->cfa_offset = fc->cfa_offset;
              rs->cfa_reg = fc->cfa_reg;
              rs->ra = fc->ra;
              rs->cfa_exp = fc->cfa_exp;
              rs->ncols = fc->ncols;
              rs->col_type = xcmalloc (rs->ncols, sizeof (*rs->col_type));
              rs->col_offset = xcmalloc (rs->ncols, sizeof (*rs->col_offset));
              memcpy (rs->col_type, fc->col_type,
                      rs->ncols * sizeof (*fc->col_type));
              memcpy (rs->col_offset, fc->col_offset,
                      rs->ncols * sizeof (*fc->col_offset));
              rs->next = remembered_state;
              remembered_state = rs;
              break;

            case DW_CFA_restore_state:
              if (! do_debug_frames_interp)
                printf ("  DW_CFA_restore_state\n");
              rs = remembered_state;
              if (rs)
                {
                  remembered_state = rs->next;
                  fc->cfa_offset = rs->cfa_offset;
                  fc->cfa_reg = rs->cfa_reg;
                  fc->ra = rs->ra;
                  fc->cfa_exp = rs->cfa_exp;
                  if (frame_need_space (fc, rs->ncols - 1) < 0)
                    {
                      warn (_("Invalid column number in saved frame state\n"));
                      fc->ncols = 0;
                      break;
                    }
                  memcpy (fc->col_type, rs->col_type,
                          rs->ncols * sizeof (*rs->col_type));
                  memcpy (fc->col_offset, rs->col_offset,
                          rs->ncols * sizeof (*rs->col_offset));
                  free (rs->col_type);
                  free (rs->col_offset);
                  free (rs);
                }
              else if (do_debug_frames_interp)
                printf ("Mismatched DW_CFA_restore_state\n");
              break;

            case DW_CFA_def_cfa:
              READ_ULEB (fc->cfa_reg, start, block_end);
              READ_ULEB (fc->cfa_offset, start, block_end);
              fc->cfa_exp = 0;
              if (! do_debug_frames_interp)
                printf ("  DW_CFA_def_cfa: %s ofs %d\n",
                        regname (fc->cfa_reg, 0), (int) fc->cfa_offset);
              break;

            case DW_CFA_def_cfa_register:
              READ_ULEB (fc->cfa_reg, start, block_end);
              fc->cfa_exp = 0;
              if (! do_debug_frames_interp)
                printf ("  DW_CFA_def_cfa_register: %s\n",
                        regname (fc->cfa_reg, 0));
              break;

            case DW_CFA_def_cfa_offset:
              READ_ULEB (fc->cfa_offset, start, block_end);
              if (! do_debug_frames_interp)
                printf ("  DW_CFA_def_cfa_offset: %d\n", (int) fc->cfa_offset);
              break;

            case DW_CFA_nop:
              if (! do_debug_frames_interp)
                printf ("  DW_CFA_nop\n");
              break;

            case DW_CFA_def_cfa_expression:
              READ_ULEB (ofs, start, block_end);
              if (ofs > (size_t) (block_end - start))
                {
                  printf (_("  %s: <corrupt len %" PRIu64 ">\n"),
                          "DW_CFA_def_cfa_expression", ofs);
                  break;
                }
              if (! do_debug_frames_interp)
                {
                  printf ("  DW_CFA_def_cfa_expression (");
                  decode_location_expression (start, eh_addr_size, 0, -1,
                                              ofs, 0, section);
                  printf (")\n");
                }
              fc->cfa_exp = 1;
              start += ofs;
              break;

            case DW_CFA_expression:
              READ_ULEB (reg, start, block_end);
              READ_ULEB (ofs, start, block_end);
              if (reg >= fc->ncols)
                reg_prefix = bad_reg;
              /* PR 17512: file: 069-133014-0.006.  */
              /* PR 17512: file: 98c02eb4.  */
              if (ofs > (size_t) (block_end - start))
                {
                  printf (_("  %s: <corrupt len %" PRIu64 ">\n"),
                          "DW_CFA_expression", ofs);
                  break;
                }
              if (! do_debug_frames_interp || *reg_prefix != '\0')
                {
                  printf ("  DW_CFA_expression: %s%s (",
                          reg_prefix, regname (reg, 0));
                  decode_location_expression (start, eh_addr_size, 0, -1,
                                              ofs, 0, section);
                  printf (")\n");
                }
              if (*reg_prefix == '\0')
                fc->col_type[reg] = DW_CFA_expression;
              start += ofs;
              break;

            case DW_CFA_val_expression:
              READ_ULEB (reg, start, block_end);
              READ_ULEB (ofs, start, block_end);
              if (reg >= fc->ncols)
                reg_prefix = bad_reg;
              if (ofs > (size_t) (block_end - start))
                {
                  printf ("  %s: <corrupt len %" PRIu64 ">\n",
                          "DW_CFA_val_expression", ofs);
                  break;
                }
              if (! do_debug_frames_interp || *reg_prefix != '\0')
                {
                  printf ("  DW_CFA_val_expression: %s%s (",
                          reg_prefix, regname (reg, 0));
                  decode_location_expression (start, eh_addr_size, 0, -1,
                                              ofs, 0, section);
                  printf (")\n");
                }
              if (*reg_prefix == '\0')
                fc->col_type[reg] = DW_CFA_val_expression;
              start += ofs;
              break;

            case DW_CFA_offset_extended_sf:
              READ_ULEB (reg, start, block_end);
              READ_SLEB (sofs, start, block_end);
              /* data_factor multiplicaton done here as unsigned to
                 avoid integer overflow warnings from asan on fuzzed
                 objects.  */
              ofs = sofs;
              ofs *= fc->data_factor;
              if (reg >= fc->ncols)
                reg_prefix = bad_reg;
              if (! do_debug_frames_interp || *reg_prefix != '\0')
                printf ("  DW_CFA_offset_extended_sf: %s%s at cfa%+" PRId64 "\n",
                        reg_prefix, regname (reg, 0), ofs);
              if (*reg_prefix == '\0')
                {
                  fc->col_type[reg] = DW_CFA_offset;
                  fc->col_offset[reg] = ofs;
                }
              break;

            case DW_CFA_val_offset_sf:
              READ_ULEB (reg, start, block_end);
              READ_SLEB (sofs, start, block_end);
              ofs = sofs;
              ofs *= fc->data_factor;
              if (reg >= fc->ncols)
                reg_prefix = bad_reg;
              if (! do_debug_frames_interp || *reg_prefix != '\0')
                printf ("  DW_CFA_val_offset_sf: %s%s is cfa%+" PRId64 "\n",
                        reg_prefix, regname (reg, 0), ofs);
              if (*reg_prefix == '\0')
                {
                  fc->col_type[reg] = DW_CFA_val_offset;
                  fc->col_offset[reg] = ofs;
                }
              break;

            case DW_CFA_def_cfa_sf:
              READ_ULEB (fc->cfa_reg, start, block_end);
              READ_SLEB (sofs, start, block_end);
              ofs = sofs;
              ofs *= fc->data_factor;
              fc->cfa_offset = ofs;
              fc->cfa_exp = 0;
              if (! do_debug_frames_interp)
                printf ("  DW_CFA_def_cfa_sf: %s ofs %" PRId64 "\n",
                        regname (fc->cfa_reg, 0), ofs);
              break;

            case DW_CFA_def_cfa_offset_sf:
              READ_SLEB (sofs, start, block_end);
              ofs = sofs;
              ofs *= fc->data_factor;
              fc->cfa_offset = ofs;
              if (! do_debug_frames_interp)
                printf ("  DW_CFA_def_cfa_offset_sf: %" PRId64 "\n", ofs);
              break;

            case DW_CFA_MIPS_advance_loc8:
              SAFE_BYTE_GET_AND_INC (ofs, start, 8, block_end);
              ofs *= fc->code_factor;
              if (do_debug_frames_interp)
                frame_display_row (fc, &need_col_headers, &max_regs);
              else
                {
                  printf ("  DW_CFA_MIPS_advance_loc8: %" PRId64 " to ", ofs);
                  print_hex_ns (fc->pc_begin + ofs, fc->ptr_size);
                  printf ("\n");
                }
              fc->pc_begin += ofs;
              break;

            case DW_CFA_GNU_window_save:
              if (! do_debug_frames_interp)
                printf ("  %s\n", DW_CFA_GNU_window_save_name[is_aarch64]);
              break;

            case DW_CFA_GNU_args_size:
              READ_ULEB (ofs, start, block_end);
              if (! do_debug_frames_interp)
                printf ("  DW_CFA_GNU_args_size: %" PRIu64 "\n", ofs);
              break;

            case DW_CFA_GNU_negative_offset_extended:
              READ_ULEB (reg, start, block_end);
              READ_SLEB (sofs, start, block_end);
              ofs = sofs;
              ofs = -ofs * fc->data_factor;
              if (reg >= fc->ncols)
                reg_prefix = bad_reg;
              if (! do_debug_frames_interp || *reg_prefix != '\0')
                printf ("  DW_CFA_GNU_negative_offset_extended: %s%s "
                        "at cfa%+" PRId64 "\n",
                        reg_prefix, regname (reg, 0), ofs);
              if (*reg_prefix == '\0')
                {
                  fc->col_type[reg] = DW_CFA_offset;
                  fc->col_offset[reg] = ofs;
                }
              break;

            default:
              if (op >= DW_CFA_lo_user && op <= DW_CFA_hi_user)
                printf (_("  DW_CFA_??? (User defined call frame op: %#x)\n"), op);
              else
                warn (_("Unsupported or unknown Dwarf Call Frame Instruction number: %#x\n"), op);
              start = block_end;
            }
        }

      /* Interpret the CFA - as long as it is not completely full of NOPs.  */
      if (do_debug_frames_interp && ! all_nops)
        frame_display_row (fc, &need_col_headers, &max_regs);

      if (fde_fc.col_type != NULL)
        {
          free (fde_fc.col_type);
          fde_fc.col_type = NULL;
        }
      if (fde_fc.col_offset != NULL)
        {
          free (fde_fc.col_offset);
          fde_fc.col_offset = NULL;
        }

      start = block_end;
      eh_addr_size = saved_eh_addr_size;
    }

  printf ("\n");

  while (remembered_state != NULL)
    {
      rs = remembered_state;
      remembered_state = rs->next;
      free (rs->col_type);
      free (rs->col_offset);
      rs->next = NULL; /* Paranoia.  */
      free (rs);
    }

  while (chunks != NULL)
    {
      rs = chunks;
      chunks = rs->next;
      free (rs->col_type);
      free (rs->col_offset);
      rs->next = NULL; /* Paranoia.  */
      free (rs);
    }

  while (forward_refs != NULL)
    {
      rs = forward_refs;
      forward_refs = rs->next;
      free (rs->col_type);
      free (rs->col_offset);
      rs->next = NULL; /* Paranoia.  */
      free (rs);
    }

  return 1;
}

#undef GET

static int
display_debug_names (struct dwarf_section *section, void *file)
{
  unsigned char *hdrptr = section->start;
  uint64_t unit_length;
  unsigned char *unit_start;
  const unsigned char *const section_end = section->start + section->size;
  unsigned char *unit_end;

  introduce (section, false);

  load_debug_section_with_follow (str, file);

  for (; hdrptr < section_end; hdrptr = unit_end)
    {
      unsigned int offset_size;
      uint16_t dwarf_version, padding;
      uint32_t comp_unit_count, local_type_unit_count, foreign_type_unit_count;
      uint64_t bucket_count, name_count, abbrev_table_size;
      uint32_t augmentation_string_size;
      unsigned int i;
      bool augmentation_printable;
      const char *augmentation_string;
      size_t total;

      unit_start = hdrptr;

      /* Get and check the length of the block.  */
      SAFE_BYTE_GET_AND_INC (unit_length, hdrptr, 4, section_end);

      if (unit_length == 0xffffffff)
        {
          /* This section is 64-bit DWARF.  */
          SAFE_BYTE_GET_AND_INC (unit_length, hdrptr, 8, section_end);
          offset_size = 8;
        }
      else
        offset_size = 4;

      if (unit_length > (size_t) (section_end - hdrptr)
          || unit_length < 2 + 2 + 4 * 7)
        {
        too_short:
          warn (_("Debug info is corrupted, %s header at %#tx"
                  " has length %#" PRIx64 "\n"),
                section->name, unit_start - section->start, unit_length);
          return 0;
        }
      unit_end = hdrptr + unit_length;

      /* Get and check the version number.  */
      SAFE_BYTE_GET_AND_INC (dwarf_version, hdrptr, 2, unit_end);
      printf (_("Version %d\n"), (int) dwarf_version);

      /* Prior versions did not exist, and future versions may not be
         backwards compatible.  */
      if (dwarf_version != 5)
        {
          warn (_("Only DWARF version 5 .debug_names "
                  "is currently supported.\n"));
          return 0;
        }

      SAFE_BYTE_GET_AND_INC (padding, hdrptr, 2, unit_end);
      if (padding != 0)
        warn (_("Padding field of .debug_names must be 0 (found 0x%x)\n"),
              padding);

      SAFE_BYTE_GET_AND_INC (comp_unit_count, hdrptr, 4, unit_end);
      if (comp_unit_count == 0)
        warn (_("Compilation unit count must be >= 1 in .debug_names\n"));

      SAFE_BYTE_GET_AND_INC (local_type_unit_count, hdrptr, 4, unit_end);
      SAFE_BYTE_GET_AND_INC (foreign_type_unit_count, hdrptr, 4, unit_end);
      SAFE_BYTE_GET_AND_INC (bucket_count, hdrptr, 4, unit_end);
      SAFE_BYTE_GET_AND_INC (name_count, hdrptr, 4, unit_end);
      SAFE_BYTE_GET_AND_INC (abbrev_table_size, hdrptr, 4, unit_end);

      SAFE_BYTE_GET_AND_INC (augmentation_string_size, hdrptr, 4, unit_end);
      if (augmentation_string_size % 4 != 0)
        {
          warn (_("Augmentation string length %u must be rounded up "
                  "to a multiple of 4 in .debug_names.\n"),
                augmentation_string_size);
          augmentation_string_size += (-augmentation_string_size) & 3;
        }
      if (augmentation_string_size > (size_t) (unit_end - hdrptr))
        goto too_short;

      printf (_("Augmentation string:"));

      augmentation_printable = true;
      augmentation_string = (const char *) hdrptr;

      for (i = 0; i < augmentation_string_size; i++)
        {
          unsigned char uc;

          SAFE_BYTE_GET_AND_INC (uc, hdrptr, 1, unit_end);
          printf (" %02x", uc);

          if (uc != 0 && !ISPRINT (uc))
            augmentation_printable = false;
        }

      if (augmentation_printable)
        {
          printf ("  (\"");
          for (i = 0;
               i < augmentation_string_size && augmentation_string[i];
               ++i)
            putchar (augmentation_string[i]);
          printf ("\")");
        }
      putchar ('\n');

      printf (_("CU table:\n"));
      if (_mul_overflow (comp_unit_count, offset_size, &total)
          || total > (size_t) (unit_end - hdrptr))
        goto too_short;
      for (i = 0; i < comp_unit_count; i++)
        {
          uint64_t cu_offset;

          SAFE_BYTE_GET_AND_INC (cu_offset, hdrptr, offset_size, unit_end);
          printf ("[%3u] %#" PRIx64 "\n", i, cu_offset);
        }
      putchar ('\n');

      printf (_("TU table:\n"));
      if (_mul_overflow (local_type_unit_count, offset_size, &total)
          || total > (size_t) (unit_end - hdrptr))
        goto too_short;
      for (i = 0; i < local_type_unit_count; i++)
        {
          uint64_t tu_offset;

          SAFE_BYTE_GET_AND_INC (tu_offset, hdrptr, offset_size, unit_end);
          printf ("[%3u] %#" PRIx64 "\n", i, tu_offset);
        }
      putchar ('\n');

      printf (_("Foreign TU table:\n"));
      if (_mul_overflow (foreign_type_unit_count, 8, &total)
          || total > (size_t) (unit_end - hdrptr))
        goto too_short;
      for (i = 0; i < foreign_type_unit_count; i++)
        {
          uint64_t signature;

          SAFE_BYTE_GET_AND_INC (signature, hdrptr, 8, unit_end);
          printf (_("[%3u] "), i);
          print_hex_ns (signature, 8);
          putchar ('\n');
        }
      putchar ('\n');

      uint64_t xtra = (bucket_count * sizeof (uint32_t)
                       + name_count * (sizeof (uint32_t) + 2 * offset_size)
                       + abbrev_table_size);
      if (xtra > (size_t) (unit_end - hdrptr))
        {
          warn (_("Entry pool offset (%#" PRIx64 ") exceeds unit size %#tx "
                  "for unit %#tx in the debug_names\n"),
                xtra, unit_end - unit_start, unit_start - section->start);
          return 0;
        }
      const uint32_t *const hash_table_buckets = (uint32_t *) hdrptr;
      hdrptr += bucket_count * sizeof (uint32_t);
      const uint32_t *const hash_table_hashes = (uint32_t *) hdrptr;
      hdrptr += name_count * sizeof (uint32_t);
      unsigned char *const name_table_string_offsets = hdrptr;
      hdrptr += name_count * offset_size;
      unsigned char *const name_table_entry_offsets = hdrptr;
      hdrptr += name_count * offset_size;
      unsigned char *const abbrev_table = hdrptr;
      hdrptr += abbrev_table_size;
      const unsigned char *const abbrev_table_end = hdrptr;
      unsigned char *const entry_pool = hdrptr;

      size_t buckets_filled = 0;
      size_t bucketi;
      for (bucketi = 0; bucketi < bucket_count; bucketi++)
        {
          const uint32_t bucket = hash_table_buckets[bucketi];

          if (bucket != 0)
            ++buckets_filled;
        }
      printf (ngettext ("Used %zu of %lu bucket.\n",
                        "Used %zu of %lu buckets.\n",
                        (unsigned long) bucket_count),
              buckets_filled, (unsigned long) bucket_count);

      if (bucket_count != 0)
        {
          uint32_t hash_prev = 0;
          size_t hash_clash_count = 0;
          size_t longest_clash = 0;
          size_t this_length = 0;
          size_t hashi;
          for (hashi = 0; hashi < name_count; hashi++)
            {
              const uint32_t hash_this = hash_table_hashes[hashi];

              if (hashi > 0)
                {
                  if (hash_prev % bucket_count == hash_this % bucket_count)
                    {
                      ++hash_clash_count;
                      ++this_length;
                      longest_clash = MAX (longest_clash, this_length);
                    }
                  else
                    this_length = 0;
                }
              hash_prev = hash_this;
            }
          printf (_("Out of %" PRIu64 " items there are %zu bucket clashes"
                    " (longest of %zu entries).\n"),
                  name_count, hash_clash_count, longest_clash);

          if (name_count != buckets_filled + hash_clash_count)
            warn (_("The name_count (%" PRIu64 ")"
                    " is not the same as the used bucket_count"
                    " (%zu) + the hash clash count (%zu)"),
                  name_count, buckets_filled, hash_clash_count);
        }

      struct abbrev_lookup_entry
      {
        uint64_t abbrev_tag;
        unsigned char *abbrev_lookup_ptr;
      };
      struct abbrev_lookup_entry *abbrev_lookup = NULL;
      size_t abbrev_lookup_used = 0;
      size_t abbrev_lookup_allocated = 0;

      unsigned char *abbrevptr = abbrev_table;
      for (;;)
        {
          uint64_t abbrev_tag;

          READ_ULEB (abbrev_tag, abbrevptr, abbrev_table_end);
          if (abbrev_tag == 0)
            break;
          if (abbrev_lookup_used == abbrev_lookup_allocated)
            {
              abbrev_lookup_allocated = MAX (0x100,
                                             abbrev_lookup_allocated * 2);
              abbrev_lookup = xrealloc (abbrev_lookup,
                                        (abbrev_lookup_allocated
                                         * sizeof (*abbrev_lookup)));
            }
          assert (abbrev_lookup_used < abbrev_lookup_allocated);
          struct abbrev_lookup_entry *entry;
          for (entry = abbrev_lookup;
               entry < abbrev_lookup + abbrev_lookup_used;
               entry++)
            if (entry->abbrev_tag == abbrev_tag)
              {
                warn (_("Duplicate abbreviation tag %" PRIu64
                        " in unit %#tx in the debug_names section\n"),
                      abbrev_tag, unit_start - section->start);
                break;
              }
          entry = &abbrev_lookup[abbrev_lookup_used++];
          entry->abbrev_tag = abbrev_tag;
          entry->abbrev_lookup_ptr = abbrevptr;

          /* Skip DWARF tag.  */
          SKIP_ULEB (abbrevptr, abbrev_table_end);
          for (;;)
            {
              uint64_t xindex, form;

              READ_ULEB (xindex, abbrevptr, abbrev_table_end);
              READ_ULEB (form, abbrevptr, abbrev_table_end);
              if (xindex == 0 && form == 0)
                break;
            }
        }

      printf (_("\nSymbol table:\n"));
      uint32_t namei;
      for (namei = 0; namei < name_count; ++namei)
        {
          uint64_t string_offset, entry_offset;
          unsigned char *p;

          p = name_table_string_offsets + namei * offset_size;
          SAFE_BYTE_GET (string_offset, p, offset_size, unit_end);
          p = name_table_entry_offsets + namei * offset_size;
          SAFE_BYTE_GET (entry_offset, p, offset_size, unit_end);

          printf ("[%3u] #%08x %s:", namei, hash_table_hashes[namei],
                  fetch_indirect_string (string_offset));

          unsigned char *entryptr = entry_pool + entry_offset;

          /* We need to scan first whether there is a single or multiple
             entries.  TAGNO is -2 for the first entry, it is -1 for the
             initial tag read of the second entry, then it becomes 0 for the
             first entry for real printing etc.  */
          int tagno = -2;
          /* Initialize it due to a false compiler warning.  */
          uint64_t second_abbrev_tag = -1;
          for (;;)
            {
              uint64_t abbrev_tag;
              uint64_t dwarf_tag;
              const struct abbrev_lookup_entry *entry;

              READ_ULEB (abbrev_tag, entryptr, unit_end);
              if (tagno == -1)
                {
                  second_abbrev_tag = abbrev_tag;
                  tagno = 0;
                  entryptr = entry_pool + entry_offset;
                  continue;
                }
              if (abbrev_tag == 0)
                break;
              if (tagno >= 0)
                printf ("%s<%" PRIu64 ">",
                        (tagno == 0 && second_abbrev_tag == 0 ? " " : "\n\t"),
                        abbrev_tag);

              for (entry = abbrev_lookup;
                   entry < abbrev_lookup + abbrev_lookup_used;
                   entry++)
                if (entry->abbrev_tag == abbrev_tag)
                  break;
              if (entry >= abbrev_lookup + abbrev_lookup_used)
                {
                  warn (_("Undefined abbreviation tag %" PRId64
                          " in unit %#tx in the debug_names section\n"),
                        abbrev_tag,
                        unit_start - section->start);
                  break;
                }
              abbrevptr = entry->abbrev_lookup_ptr;
              READ_ULEB (dwarf_tag, abbrevptr, abbrev_table_end);
              if (tagno >= 0)
                printf (" %s", get_TAG_name (dwarf_tag));
              for (;;)
                {
                  uint64_t xindex, form;

                  READ_ULEB (xindex, abbrevptr, abbrev_table_end);
                  READ_ULEB (form, abbrevptr, abbrev_table_end);
                  if (xindex == 0 && form == 0)
                    break;

                  if (tagno >= 0)
                    printf (" %s", get_IDX_name (xindex));
                  entryptr = read_and_display_attr_value (0, form, 0,
                                                          unit_start, entryptr, unit_end,
                                                          0, 0, offset_size,
                                                          dwarf_version, NULL,
                                                          (tagno < 0), section,
                                                          NULL, '=', -1);
                }
              ++tagno;
            }
          if (tagno <= 0)
            printf (_(" <no entries>"));
          putchar ('\n');
        }

      free (abbrev_lookup);
    }

  return 1;
}

static int
display_debug_links (struct dwarf_section *  section,
                     void *                  file ATTRIBUTE_UNUSED)
{
  const unsigned char * filename;
  unsigned int          filelen;

  introduce (section, false);

  /* The .gnu_debuglink section is formatted as:
      (c-string)  Filename.
      (padding)   If needed to reach a 4 byte boundary.
      (uint32_t)  CRC32 value.

    The .gun_debugaltlink section is formatted as:
      (c-string)  Filename.
      (binary)    Build-ID.  */

  filename =  section->start;
  filelen = strnlen ((const char *) filename, section->size);
  if (filelen == section->size)
    {
      warn (_("The debuglink filename is corrupt/missing\n"));
      return 0;
    }

  printf (_("  Separate debug info file: %s\n"), filename);

  if (startswith (section->name, ".gnu_debuglink"))
    {
      unsigned int          crc32;
      unsigned int          crc_offset;

      crc_offset = filelen + 1;
      crc_offset = (crc_offset + 3) & ~3;
      if (crc_offset + 4 > section->size)
        {
          warn (_("CRC offset missing/truncated\n"));
          return 0;
        }

      crc32 = byte_get (filename + crc_offset, 4);

      printf (_("  CRC value: %#x\n"), crc32);

      if (crc_offset + 4 < section->size)
        {
          warn (_("There are %#" PRIx64
                  " extraneous bytes at the end of the section\n"),
                section->size - (crc_offset + 4));
          return 0;
        }
    }
  else /* startswith (section->name, ".gnu_debugaltlink") */
    {
      const unsigned char *build_id = section->start + filelen + 1;
      size_t build_id_len = section->size - (filelen + 1);
      size_t printed;

      /* FIXME: Should we support smaller build-id notes ?  */
      if (build_id_len < 0x14)
        {
          warn (_("Build-ID is too short (%#zx bytes)\n"), build_id_len);
          return 0;
        }

      printed = printf (_("  Build-ID (%#zx bytes):"), build_id_len);
      display_data (printed, build_id, build_id_len);
      putchar ('\n');
    }

  putchar ('\n');
  return 1;
}

static int
display_gdb_index (struct dwarf_section *section,
                   void *file ATTRIBUTE_UNUSED)
{
  unsigned char *start = section->start;
  uint32_t version;
  uint32_t cu_list_offset, tu_list_offset;
  uint32_t address_table_offset, symbol_table_offset, constant_pool_offset;
  unsigned int cu_list_elements, tu_list_elements;
  unsigned int address_table_elements, symbol_table_slots;
  unsigned char *cu_list, *tu_list;
  unsigned char *address_table, *symbol_table, *constant_pool;
  unsigned int i;

  /* The documentation for the format of this file is in gdb/dwarf2read.c.  */

  introduce (section, false);

  if (section->size < 6 * sizeof (uint32_t))
    {
      warn (_("Truncated header in the %s section.\n"), section->name);
      return 0;
    }

  version = byte_get_little_endian (start, 4);
  printf (_("Version %lu\n"), (unsigned long) version);

  /* Prior versions are obsolete, and future versions may not be
     backwards compatible.  */
  if (version < 3 || version > 8)
    {
      warn (_("Unsupported version %lu.\n"), (unsigned long) version);
      return 0;
    }
  if (version < 4)
    warn (_("The address table data in version 3 may be wrong.\n"));
  if (version < 5)
    warn (_("Version 4 does not support case insensitive lookups.\n"));
  if (version < 6)
    warn (_("Version 5 does not include inlined functions.\n"));
  if (version < 7)
      warn (_("Version 6 does not include symbol attributes.\n"));
  /* Version 7 indices generated by Gold have bad type unit references,
     PR binutils/15021.  But we don't know if the index was generated by
     Gold or not, so to avoid worrying users with gdb-generated indices
     we say nothing for version 7 here.  */

  cu_list_offset = byte_get_little_endian (start + 4, 4);
  tu_list_offset = byte_get_little_endian (start + 8, 4);
  address_table_offset = byte_get_little_endian (start + 12, 4);
  symbol_table_offset = byte_get_little_endian (start + 16, 4);
  constant_pool_offset = byte_get_little_endian (start + 20, 4);

  if (cu_list_offset > section->size
      || tu_list_offset > section->size
      || address_table_offset > section->size
      || symbol_table_offset > section->size
      || constant_pool_offset > section->size
      || tu_list_offset < cu_list_offset
      || address_table_offset < tu_list_offset
      || symbol_table_offset < address_table_offset
      || constant_pool_offset < symbol_table_offset)
    {
      warn (_("Corrupt header in the %s section.\n"), section->name);
      return 0;
    }

  cu_list_elements = (tu_list_offset - cu_list_offset) / 16;
  tu_list_elements = (address_table_offset - tu_list_offset) / 24;
  address_table_elements = (symbol_table_offset - address_table_offset) / 20;
  symbol_table_slots = (constant_pool_offset - symbol_table_offset) / 8;

  cu_list = start + cu_list_offset;
  tu_list = start + tu_list_offset;
  address_table = start + address_table_offset;
  symbol_table = start + symbol_table_offset;
  constant_pool = start + constant_pool_offset;

  printf (_("\nCU table:\n"));
  for (i = 0; i < cu_list_elements; i++)
    {
      uint64_t cu_offset = byte_get_little_endian (cu_list + i * 16, 8);
      uint64_t cu_length = byte_get_little_endian (cu_list + i * 16 + 8, 8);

      printf ("[%3u] %#" PRIx64 " - %#" PRIx64 "\n",
              i, cu_offset, cu_offset + cu_length - 1);
    }

  printf (_("\nTU table:\n"));
  for (i = 0; i < tu_list_elements; i++)
    {
      uint64_t tu_offset = byte_get_little_endian (tu_list + i * 24, 8);
      uint64_t type_offset = byte_get_little_endian (tu_list + i * 24 + 8, 8);
      uint64_t signature = byte_get_little_endian (tu_list + i * 24 + 16, 8);

      printf ("[%3u] %#" PRIx64 " %#" PRIx64 " ",
              i, tu_offset, type_offset);
      print_hex_ns (signature, 8);
      printf ("\n");
    }

  printf (_("\nAddress table:\n"));
  for (i = 0; i < address_table_elements; i++)
    {
      uint64_t low = byte_get_little_endian (address_table + i * 20, 8);
      uint64_t high = byte_get_little_endian (address_table + i * 20 + 8, 8);
      uint32_t cu_index = byte_get_little_endian (address_table + i * 20 + 16, 4);

      print_hex (low, 8);
      print_hex (high, 8);
      printf ("%" PRIu32 "\n", cu_index);
    }

  printf (_("\nSymbol table:\n"));
  for (i = 0; i < symbol_table_slots; ++i)
    {
      uint32_t name_offset = byte_get_little_endian (symbol_table + i * 8, 4);
      uint32_t cu_vector_offset = byte_get_little_endian (symbol_table + i * 8 + 4, 4);
      uint32_t num_cus, cu;

      if (name_offset != 0
          || cu_vector_offset != 0)
        {
          unsigned int j;

          /* PR 17531: file: 5b7b07ad.  */
          if (name_offset >= section->size - constant_pool_offset)
            {
              printf (_("[%3u] <corrupt offset: %x>"), i, name_offset);
              warn (_("Corrupt name offset of 0x%x found for symbol table slot %d\n"),
                    name_offset, i);
            }
          else
            printf ("[%3u] %.*s:", i,
                    (int) (section->size - (constant_pool_offset + name_offset)),
                    constant_pool + name_offset);

          if (section->size - constant_pool_offset < 4
              || cu_vector_offset > section->size - constant_pool_offset - 4)
            {
              printf (_("<invalid CU vector offset: %x>\n"), cu_vector_offset);
              warn (_("Corrupt CU vector offset of 0x%x found for symbol table slot %d\n"),
                    cu_vector_offset, i);
              continue;
            }

          num_cus = byte_get_little_endian (constant_pool + cu_vector_offset, 4);

          if ((uint64_t) num_cus * 4 > section->size - (constant_pool_offset
                                                        + cu_vector_offset + 4))
            {
              printf ("<invalid number of CUs: %d>\n", num_cus);
              warn (_("Invalid number of CUs (0x%x) for symbol table slot %d\n"),
                    num_cus, i);
              continue;
            }

          if (num_cus > 1)
            printf ("\n");

          for (j = 0; j < num_cus; ++j)
            {
              int is_static;
              gdb_index_symbol_kind kind;

              cu = byte_get_little_endian (constant_pool + cu_vector_offset + 4 + j * 4, 4);
              is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu);
              kind = GDB_INDEX_SYMBOL_KIND_VALUE (cu);
              cu = GDB_INDEX_CU_VALUE (cu);
              /* Convert to TU number if it's for a type unit.  */
              if (cu >= cu_list_elements)
                printf ("%cT%lu", num_cus > 1 ? '\t' : ' ',
                        (unsigned long) cu - cu_list_elements);
              else
                printf ("%c%lu", num_cus > 1 ? '\t' : ' ', (unsigned long) cu);

              printf (" [%s, %s]",
                      is_static ? _("static") : _("global"),
                      get_gdb_index_symbol_kind_name (kind));
              if (num_cus > 1)
                printf ("\n");
            }
          if (num_cus <= 1)
            printf ("\n");
        }
    }

  return 1;
}

/* Pre-allocate enough space for the CU/TU sets needed.  */

static void
prealloc_cu_tu_list (unsigned int nshndx)
{
  if (shndx_pool == NULL)
    {
      shndx_pool_size = nshndx;
      shndx_pool_used = 0;
      shndx_pool = (unsigned int *) xcmalloc (shndx_pool_size,
                                              sizeof (unsigned int));
    }
  else
    {
      shndx_pool_size = shndx_pool_used + nshndx;
      shndx_pool = (unsigned int *) xcrealloc (shndx_pool, shndx_pool_size,
                                               sizeof (unsigned int));
    }
}

static void
add_shndx_to_cu_tu_entry (unsigned int shndx)
{
  shndx_pool [shndx_pool_used++] = shndx;
}

static void
end_cu_tu_entry (void)
{
  shndx_pool [shndx_pool_used++] = 0;
}

/* Return the short name of a DWARF section given by a DW_SECT enumerator.  */

static const char *
get_DW_SECT_short_name (unsigned int dw_sect)
{
  static char buf[16];

  switch (dw_sect)
    {
      case DW_SECT_INFO:
        return "info";
      case DW_SECT_TYPES:
        return "types";
      case DW_SECT_ABBREV:
        return "abbrev";
      case DW_SECT_LINE:
        return "line";
      case DW_SECT_LOC:
        return "loc";
      case DW_SECT_STR_OFFSETS:
        return "str_off";
      case DW_SECT_MACINFO:
        return "macinfo";
      case DW_SECT_MACRO:
        return "macro";
      default:
        break;
    }

  snprintf (buf, sizeof (buf), "%d", dw_sect);
  return buf;
}

/* Process a CU or TU index.  If DO_DISPLAY is true, print the contents.
   These sections are extensions for Fission.
   See http://gcc.gnu.org/wiki/DebugFissionDWP.  */

static int
process_cu_tu_index (struct dwarf_section *section, int do_display)
{
  unsigned char *phdr = section->start;
  unsigned char *limit = phdr + section->size;
  unsigned char *phash;
  unsigned char *pindex;
  unsigned char *ppool;
  unsigned int version;
  unsigned int ncols = 0;
  unsigned int nused;
  unsigned int nslots;
  unsigned int i;
  unsigned int j;
  uint64_t signature;
  size_t total;

  /* PR 17512: file: 002-168123-0.004.  */
  if (phdr == NULL)
    {
      warn (_("Section %s is empty\n"), section->name);
      return 0;
    }
  /* PR 17512: file: 002-376-0.004.  */
  if (section->size < 24)
    {
      warn (_("Section %s is too small to contain a CU/TU header\n"),
            section->name);
      return 0;
    }

  phash = phdr;
  SAFE_BYTE_GET_AND_INC (version, phash, 4, limit);
  if (version >= 2)
    SAFE_BYTE_GET_AND_INC (ncols, phash, 4, limit);
  SAFE_BYTE_GET_AND_INC (nused, phash, 4, limit);
  SAFE_BYTE_GET_AND_INC (nslots, phash, 4, limit);

  pindex = phash + (size_t) nslots * 8;
  ppool = pindex + (size_t) nslots * 4;

  if (do_display)
    {
      introduce (section, false);

      printf (_("  Version:                 %u\n"), version);
      if (version >= 2)
        printf (_("  Number of columns:       %u\n"), ncols);
      printf (_("  Number of used entries:  %u\n"), nused);
      printf (_("  Number of slots:         %u\n\n"), nslots);
    }

  /* PR 17531: file: 45d69832.  */
  if (_mul_overflow ((size_t) nslots, 12, &total)
      || total > (size_t) (limit - phash))
    {
      warn (ngettext ("Section %s is too small for %u slot\n",
                      "Section %s is too small for %u slots\n",
                      nslots),
            section->name, nslots);
      return 0;
    }

  if (version == 1)
    {
      unsigned char *shndx_list;
      unsigned int shndx;

      if (!do_display)
        {
          prealloc_cu_tu_list ((limit - ppool) / 4);
          for (shndx_list = ppool + 4; shndx_list <= limit - 4; shndx_list += 4)
            {
              shndx = byte_get (shndx_list, 4);
              add_shndx_to_cu_tu_entry (shndx);
            }
          end_cu_tu_entry ();
        }
      else
        for (i = 0; i < nslots; i++)
          {
            SAFE_BYTE_GET (signature, phash, 8, limit);
            if (signature != 0)
              {
                SAFE_BYTE_GET (j, pindex, 4, limit);
                shndx_list = ppool + j * 4;
                /* PR 17531: file: 705e010d.  */
                if (shndx_list < ppool)
                  {
                    warn (_("Section index pool located before start of section\n"));
                    return 0;
                  }

                printf (_("  [%3d] Signature:  %#" PRIx64 "  Sections: "),
                        i, signature);
                for (;;)
                  {
                    if (shndx_list >= limit)
                      {
                        warn (_("Section %s too small for shndx pool\n"),
                              section->name);
                        return 0;
                      }
                    SAFE_BYTE_GET (shndx, shndx_list, 4, limit);
                    if (shndx == 0)
                      break;
                    printf (" %d", shndx);
                    shndx_list += 4;
                  }
                printf ("\n");
              }
            phash += 8;
            pindex += 4;
          }
    }
  else if (version == 2)
    {
      unsigned int val;
      unsigned int dw_sect;
      unsigned char *ph = phash;
      unsigned char *pi = pindex;
      unsigned char *poffsets = ppool + (size_t) ncols * 4;
      unsigned char *psizes = poffsets + (size_t) nused * ncols * 4;
      bool is_tu_index;
      struct cu_tu_set *this_set = NULL;
      unsigned int row;
      unsigned char *prow;
      size_t temp;

      is_tu_index = strcmp (section->name, ".debug_tu_index") == 0;

      /* PR 17531: file: 0dd159bf.
         Check for integer overflow (can occur when size_t is 32-bit)
         with overlarge ncols or nused values.  */
      if (nused == -1u
          || _mul_overflow ((size_t) ncols, 4, &temp)
          || _mul_overflow ((size_t) nused + 1, temp, &total)
          || total > (size_t) (limit - ppool))
        {
          warn (_("Section %s too small for offset and size tables\n"),
                section->name);
          return 0;
        }

      if (do_display)
        {
          printf (_("  Offset table\n"));
          printf ("  slot  %-16s  ",
                 is_tu_index ? _("signature") : _("dwo_id"));
        }
      else
        {
          if (is_tu_index)
            {
              tu_count = nused;
              tu_sets = xcalloc2 (nused, sizeof (struct cu_tu_set));
              this_set = tu_sets;
            }
          else
            {
              cu_count = nused;
              cu_sets = xcalloc2 (nused, sizeof (struct cu_tu_set));
              this_set = cu_sets;
            }
        }

      if (do_display)
        {
          for (j = 0; j < ncols; j++)
            {
              unsigned char *p = ppool + j * 4;
              SAFE_BYTE_GET (dw_sect, p, 4, limit);
              printf (" %8s", get_DW_SECT_short_name (dw_sect));
            }
          printf ("\n");
        }

      for (i = 0; i < nslots; i++)
        {
          SAFE_BYTE_GET (signature, ph, 8, limit);

          SAFE_BYTE_GET (row, pi, 4, limit);
          if (row != 0)
            {
              /* PR 17531: file: a05f6ab3.  */
              if (row > nused)
                {
                  warn (_("Row index (%u) is larger than number of used entries (%u)\n"),
                        row, nused);
                  return 0;
                }

              if (!do_display)
                {
                  size_t num_copy = sizeof (uint64_t);

                  memcpy (&this_set[row - 1].signature, ph, num_copy);
                }

              prow = poffsets + (row - 1) * ncols * 4;
              if (do_display)
                printf ("  [%3d] %#" PRIx64, i, signature);
              for (j = 0; j < ncols; j++)
                {
                  unsigned char *p = prow + j * 4;
                  SAFE_BYTE_GET (val, p, 4, limit);
                  if (do_display)
                    printf (" %8d", val);
                  else
                    {
                      p = ppool + j * 4;
                      SAFE_BYTE_GET (dw_sect, p, 4, limit);

                      /* PR 17531: file: 10796eb3.  */
                      if (dw_sect >= DW_SECT_MAX)
                        warn (_("Overlarge Dwarf section index detected: %u\n"), dw_sect);
                      else
                        this_set [row - 1].section_offsets [dw_sect] = val;
                    }
                }

              if (do_display)
                printf ("\n");
            }
          ph += 8;
          pi += 4;
        }

      ph = phash;
      pi = pindex;
      if (do_display)
        {
          printf ("\n");
          printf (_("  Size table\n"));
          printf ("  slot  %-16s  ",
                 is_tu_index ? _("signature") : _("dwo_id"));
        }

      for (j = 0; j < ncols; j++)
        {
          unsigned char *p = ppool + j * 4;
          SAFE_BYTE_GET (val, p, 4, limit);
          if (do_display)
            printf (" %8s", get_DW_SECT_short_name (val));
        }

      if (do_display)
        printf ("\n");

      for (i = 0; i < nslots; i++)
        {
          SAFE_BYTE_GET (signature, ph, 8, limit);

          SAFE_BYTE_GET (row, pi, 4, limit);
          if (row != 0)
            {
              prow = psizes + (row - 1) * ncols * 4;

              if (do_display)
                printf ("  [%3d] %#" PRIx64, i, signature);

              for (j = 0; j < ncols; j++)
                {
                  unsigned char *p = prow + j * 4;

                  /* PR 28645: Check for overflow.  Since we do not know how
                     many populated rows there will be, we cannot just
                     perform a single check at the start of this function.  */
                  if (p > (limit - 4))
                    {
                      if (do_display)
                        printf ("\n");
                      warn (_("Too many rows/columns in DWARF index section %s\n"),
                            section->name);
                      return 0;
                    }

                  SAFE_BYTE_GET (val, p, 4, limit);

                  if (do_display)
                    printf (" %8d", val);
                  else
                    {
                      p = ppool + j * 4;
                      SAFE_BYTE_GET (dw_sect, p, 4, limit);
                      if (dw_sect >= DW_SECT_MAX)
                        warn (_("Overlarge Dwarf section index detected: %u\n"), dw_sect);
                      else
                      this_set [row - 1].section_sizes [dw_sect] = val;
                    }
                }

              if (do_display)
                printf ("\n");
            }

          ph += 8;
          pi += 4;
        }
    }
  else if (do_display)
    printf (_("  Unsupported version (%d)\n"), version);

  if (do_display)
      printf ("\n");

  return 1;
}

static int cu_tu_indexes_read = -1; /* Tri-state variable.  */

/* Load the CU and TU indexes if present.  This will build a list of
   section sets that we can use to associate a .debug_info.dwo section
   with its associated .debug_abbrev.dwo section in a .dwp file.  */

static bool
load_cu_tu_indexes (void *file)
{
  /* If we have already loaded (or tried to load) the CU and TU indexes
     then do not bother to repeat the task.  */
  if (cu_tu_indexes_read == -1)
    {
      cu_tu_indexes_read = true;

      if (load_debug_section_with_follow (dwp_cu_index, file))
        if (! process_cu_tu_index (&debug_displays [dwp_cu_index].section, 0))
          cu_tu_indexes_read = false;

      if (load_debug_section_with_follow (dwp_tu_index, file))
        if (! process_cu_tu_index (&debug_displays [dwp_tu_index].section, 0))
          cu_tu_indexes_read = false;
    }

  return (bool) cu_tu_indexes_read;
}

/* Find the set of sections that includes section SHNDX.  */

unsigned int *
find_cu_tu_set (void *file, unsigned int shndx)
{
  unsigned int i;

  if (! load_cu_tu_indexes (file))
    return NULL;

  /* Find SHNDX in the shndx pool.  */
  for (i = 0; i < shndx_pool_used; i++)
    if (shndx_pool [i] == shndx)
      break;

  if (i >= shndx_pool_used)
    return NULL;

  /* Now backup to find the first entry in the set.  */
  while (i > 0 && shndx_pool [i - 1] != 0)
    i--;

  return shndx_pool + i;
}

/* Display a .debug_cu_index or .debug_tu_index section.  */

static int
display_cu_index (struct dwarf_section *section, void *file ATTRIBUTE_UNUSED)
{
  return process_cu_tu_index (section, 1);
}

static int
display_debug_not_supported (struct dwarf_section *section,
                             void *file ATTRIBUTE_UNUSED)
{
  printf (_("Displaying the debug contents of section %s is not yet supported.\n"),
            section->name);

  return 1;
}

/* Like malloc, but takes two parameters like calloc.
   Verifies that the first parameter is not too large.
   Note: does *not* initialise the allocated memory to zero.  */

void *
cmalloc (uint64_t nmemb, size_t size)
{
  /* Check for overflow.  */
  if (nmemb >= ~(size_t) 0 / size)
    return NULL;

  return xmalloc (nmemb * size);
}

/* Like xmalloc, but takes two parameters like calloc.
   Verifies that the first parameter is not too large.
   Note: does *not* initialise the allocated memory to zero.  */

void *
xcmalloc (uint64_t nmemb, size_t size)
{
  /* Check for overflow.  */
  if (nmemb >= ~(size_t) 0 / size)
    {
      fprintf (stderr,
               _("Attempt to allocate an array with an excessive number of elements: %#" PRIx64 "\n"),
               nmemb);
      xexit (1);
    }

  return xmalloc (nmemb * size);
}

/* Like xrealloc, but takes three parameters.
   Verifies that the second parameter is not too large.
   Note: does *not* initialise any new memory to zero.  */

void *
xcrealloc (void *ptr, uint64_t nmemb, size_t size)
{
  /* Check for overflow.  */
  if (nmemb >= ~(size_t) 0 / size)
    {
      error (_("Attempt to re-allocate an array with an excessive number of elements: %#" PRIx64 "\n"),
             nmemb);
      xexit (1);
    }

  return xrealloc (ptr, nmemb * size);
}

/* Like xcalloc, but verifies that the first parameter is not too large.  */

void *
xcalloc2 (uint64_t nmemb, size_t size)
{
  /* Check for overflow.  */
  if (nmemb >= ~(size_t) 0 / size)
    {
      error (_("Attempt to allocate a zero'ed array with an excessive number of elements: %#" PRIx64 "\n"),
             nmemb);
      xexit (1);
    }

  return xcalloc (nmemb, size);
}

static unsigned long
calc_gnu_debuglink_crc32 (unsigned long crc,
                          const unsigned char *buf,
                          size_t len)
{
  static const unsigned long crc32_table[256] =
    {
      0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
      0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
      0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
      0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
      0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
      0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
      0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
      0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
      0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
      0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
      0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
      0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
      0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
      0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
      0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
      0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
      0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
      0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
      0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
      0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
      0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
      0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
      0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
      0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
      0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
      0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
      0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
      0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
      0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
      0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
      0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
      0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
      0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
      0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
      0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
      0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
      0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
      0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
      0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
      0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
      0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
      0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
      0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
      0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
      0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
      0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
      0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
      0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
      0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
      0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
      0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
      0x2d02ef8d
    };
  const unsigned char *end;

  crc = ~crc & 0xffffffff;
  for (end = buf + len; buf < end; ++ buf)
    crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
  return ~crc & 0xffffffff;
}

typedef bool (*check_func_type) (const char *, void *);
typedef const char *(* parse_func_type) (struct dwarf_section *, void *);

static bool
check_gnu_debuglink (const char * pathname, void * crc_pointer)
{
  static unsigned char buffer[8 * 1024];
  FILE *f;
  size_t count;
  unsigned long crc = 0;
  void *sep_data;

  sep_data = open_debug_file (pathname);
  if (sep_data == NULL)
    return false;

  /* Yes - we are opening the file twice...  */
  f = fopen (pathname, "rb");
  if (f == NULL)
    {
      /* Paranoia: This should never happen.  */
      close_debug_file (sep_data);
      warn (_("Unable to reopen separate debug info file: %s\n"), pathname);
      return false;
    }

  while ((count = fread (buffer, 1, sizeof (buffer), f)) > 0)
    crc = calc_gnu_debuglink_crc32 (crc, buffer, count);

  fclose (f);

  if (crc != * (unsigned long *) crc_pointer)
    {
      close_debug_file (sep_data);
      warn (_("Separate debug info file %s found, but CRC does not match - ignoring\n"),
            pathname);
      return false;
    }

  return true;
}

static const char *
parse_gnu_debuglink (struct dwarf_section * section, void * data)
{
  const char *     name;
  unsigned int     crc_offset;
  unsigned long *  crc32 = (unsigned long *) data;

  /* The name is first.
     The CRC value is stored after the filename, aligned up to 4 bytes.  */
  name = (const char *) section->start;

  crc_offset = strnlen (name, section->size) + 1;
  if (crc_offset == 1)
    return NULL;
  crc_offset = (crc_offset + 3) & ~3;
  if (crc_offset + 4 > section->size)
    return NULL;

  * crc32 = byte_get (section->start + crc_offset, 4);
  return name;
}

static bool
check_gnu_debugaltlink (const char * filename, void * data ATTRIBUTE_UNUSED)
{
  void * sep_data = open_debug_file (filename);

  if (sep_data == NULL)
    return false;

  /* FIXME: We should now extract the build-id in the separate file
     and check it...  */

  return true;
}

typedef struct build_id_data
{
  size_t len;
  const unsigned char *data;
} Build_id_data;

static const char *
parse_gnu_debugaltlink (struct dwarf_section * section, void * data)
{
  const char *name;
  size_t namelen;
  size_t id_len;
  Build_id_data *build_id_data;

  /* The name is first.
     The build-id follows immediately, with no padding, up to the section's end.  */

  name = (const char *) section->start;
  namelen = strnlen (name, section->size) + 1;
  if (namelen == 1)
    return NULL;
  if (namelen >= section->size)
    return NULL;

  id_len = section->size - namelen;
  if (id_len < 0x14)
    return NULL;

  build_id_data = (Build_id_data *) data;
  build_id_data->len = id_len;
  build_id_data->data = section->start + namelen;

  return name;
}

static void
add_separate_debug_file (const char * filename, void * handle)
{
  separate_info * i = xmalloc (sizeof * i);

  i->filename = filename;
  i->handle   = handle;
  i->next     = first_separate_info;
  first_separate_info = i;
}

#if HAVE_LIBDEBUGINFOD
/* Query debuginfod servers for the target debuglink or debugaltlink
   file. If successful, store the path of the file in filename and
   return TRUE, otherwise return FALSE.  */

static bool
debuginfod_fetch_separate_debug_info (struct dwarf_section * section,
                                      char ** filename,
                                      void * file)
{
  size_t build_id_len;
  unsigned char * build_id;

  if (strcmp (section->uncompressed_name, ".gnu_debuglink") == 0)
    {
      /* Get the build-id of file.  */
      build_id = get_build_id (file);
      build_id_len = 0;
    }
  else if (strcmp (section->uncompressed_name, ".gnu_debugaltlink") == 0)
    {
      /* Get the build-id of the debugaltlink file.  */
      unsigned int filelen;

      filelen = strnlen ((const char *)section->start, section->size);
      if (filelen == section->size)
        /* Corrupt debugaltlink.  */
        return false;

      build_id = section->start + filelen + 1;
      build_id_len = section->size - (filelen + 1);

      if (build_id_len == 0)
        return false;
    }
  else
    return false;

  if (build_id)
    {
      int fd;
      debuginfod_client * client;

      client = debuginfod_begin ();
      if (client == NULL)
        return false;

      /* Query debuginfod servers for the target file. If found its path
         will be stored in filename.  */
      fd = debuginfod_find_debuginfo (client, build_id, build_id_len, filename);
      debuginfod_end (client);

      /* Only free build_id if we allocated space for a hex string
         in get_build_id ().  */
      if (build_id_len == 0)
        free (build_id);

      if (fd >= 0)
        {
          /* File successfully retrieved. Close fd since we want to
             use open_debug_file () on filename instead.  */
          close (fd);
          return true;
        }
    }

  return false;
}
#endif /* HAVE_LIBDEBUGINFOD  */

static void *
load_separate_debug_info (const char *            main_filename,
                          struct dwarf_section *  xlink,
                          parse_func_type         parse_func,
                          check_func_type         check_func,
                          void *                  func_data,
                          void *                  file ATTRIBUTE_UNUSED)
{
  const char *   separate_filename;
  char *         debug_filename;
  char *         canon_dir;
  size_t         canon_dirlen;
  size_t         dirlen;
  char *         canon_filename;
  char *         canon_debug_filename;
  bool           self;

  if ((separate_filename = parse_func (xlink, func_data)) == NULL)
    {
      warn (_("Corrupt debuglink section: %s\n"),
            xlink->name ? xlink->name : xlink->uncompressed_name);
      return NULL;
    }

  /* Attempt to locate the separate file.
     This should duplicate the logic in bfd/opncls.c:find_separate_debug_file().  */

  canon_filename = lrealpath (main_filename);
  canon_dir = xstrdup (canon_filename);

  for (canon_dirlen = strlen (canon_dir); canon_dirlen > 0; canon_dirlen--)
    if (IS_DIR_SEPARATOR (canon_dir[canon_dirlen - 1]))
      break;
  canon_dir[canon_dirlen] = '\0';

#ifndef DEBUGDIR
#define DEBUGDIR "/lib/debug"
#endif
#ifndef EXTRA_DEBUG_ROOT1
#define EXTRA_DEBUG_ROOT1 "/usr/lib/debug"
#endif
#ifndef EXTRA_DEBUG_ROOT2
#define EXTRA_DEBUG_ROOT2 "/usr/lib/debug/usr"
#endif

  debug_filename = (char *) malloc (strlen (DEBUGDIR) + 1
                                    + canon_dirlen
                                    + strlen (".debug/")
#ifdef EXTRA_DEBUG_ROOT1
                                    + strlen (EXTRA_DEBUG_ROOT1)
#endif
#ifdef EXTRA_DEBUG_ROOT2
                                    + strlen (EXTRA_DEBUG_ROOT2)
#endif
                                    + strlen (separate_filename)
                                    + 1);
  if (debug_filename == NULL)
    {
      warn (_("Out of memory"));
      free (canon_dir);
      free (canon_filename);
      return NULL;
    }

  /* First try in the current directory.  */
  sprintf (debug_filename, "%s", separate_filename);
  if (check_func (debug_filename, func_data))
    goto found;

  /* Then try in a subdirectory called .debug.  */
  sprintf (debug_filename, ".debug/%s", separate_filename);
  if (check_func (debug_filename, func_data))
    goto found;

  /* Then try in the same directory as the original file.  */
  sprintf (debug_filename, "%s%s", canon_dir, separate_filename);
  if (check_func (debug_filename, func_data))
    goto found;

  /* And the .debug subdirectory of that directory.  */
  sprintf (debug_filename, "%s.debug/%s", canon_dir, separate_filename);
  if (check_func (debug_filename, func_data))
    goto found;

#ifdef EXTRA_DEBUG_ROOT1
  /* Try the first extra debug file root.  */
  sprintf (debug_filename, "%s/%s", EXTRA_DEBUG_ROOT1, separate_filename);
  if (check_func (debug_filename, func_data))
    goto found;

  /* Try the first extra debug file root.  */
  sprintf (debug_filename, "%s/%s/%s", EXTRA_DEBUG_ROOT1, canon_dir, separate_filename);
  if (check_func (debug_filename, func_data))
    goto found;
#endif

#ifdef EXTRA_DEBUG_ROOT2
  /* Try the second extra debug file root.  */
  sprintf (debug_filename, "%s/%s", EXTRA_DEBUG_ROOT2, separate_filename);
  if (check_func (debug_filename, func_data))
    goto found;
#endif

  /* Then try in the global debug_filename directory.  */
  strcpy (debug_filename, DEBUGDIR);
  dirlen = strlen (DEBUGDIR) - 1;
  if (dirlen > 0 && DEBUGDIR[dirlen] != '/')
    strcat (debug_filename, "/");
  strcat (debug_filename, (const char *) separate_filename);

  if (check_func (debug_filename, func_data))
    goto found;

#if HAVE_LIBDEBUGINFOD
  {
    char * tmp_filename;

    if (use_debuginfod
        && debuginfod_fetch_separate_debug_info (xlink,
                                                 & tmp_filename,
                                                 file))
      {
        /* File successfully downloaded from server, replace
           debug_filename with the file's path.  */
        free (debug_filename);
        debug_filename = tmp_filename;
        goto found;
      }
  }
#endif

  if (do_debug_links)
    {
      /* Failed to find the file.  */
      warn (_("could not find separate debug file '%s'\n"),
            separate_filename);
      warn (_("tried: %s\n"), debug_filename);

#ifdef EXTRA_DEBUG_ROOT2
      sprintf (debug_filename, "%s/%s", EXTRA_DEBUG_ROOT2,
               separate_filename);
      warn (_("tried: %s\n"), debug_filename);
#endif

#ifdef EXTRA_DEBUG_ROOT1
      sprintf (debug_filename, "%s/%s/%s", EXTRA_DEBUG_ROOT1,
               canon_dir, separate_filename);
      warn (_("tried: %s\n"), debug_filename);

      sprintf (debug_filename, "%s/%s", EXTRA_DEBUG_ROOT1,
               separate_filename);
      warn (_("tried: %s\n"), debug_filename);
#endif

      sprintf (debug_filename, "%s.debug/%s", canon_dir,
               separate_filename);
      warn (_("tried: %s\n"), debug_filename);

      sprintf (debug_filename, "%s%s", canon_dir, separate_filename);
      warn (_("tried: %s\n"), debug_filename);

      sprintf (debug_filename, ".debug/%s", separate_filename);
      warn (_("tried: %s\n"), debug_filename);

      sprintf (debug_filename, "%s", separate_filename);
      warn (_("tried: %s\n"), debug_filename);

#if HAVE_LIBDEBUGINFOD
      if (use_debuginfod)
        {
          char *urls = getenv (DEBUGINFOD_URLS_ENV_VAR);

          if (urls == NULL)
            urls = "";

          warn (_("tried: DEBUGINFOD_URLS=%s\n"), urls);
        }
#endif
    }

  free (canon_dir);
  free (debug_filename);
  free (canon_filename);
  return NULL;

 found:
  free (canon_dir);

  canon_debug_filename = lrealpath (debug_filename);
  self = strcmp (canon_debug_filename, canon_filename) == 0;
  free (canon_filename);
  free (canon_debug_filename);
  if (self)
    {
      free (debug_filename);
      return NULL;
    }

  void * debug_handle;

  /* Now open the file.... */
  if ((debug_handle = open_debug_file (debug_filename)) == NULL)
    {
      warn (_("failed to open separate debug file: %s\n"), debug_filename);
      free (debug_filename);
      return NULL;
    }

  /* FIXME: We do not check to see if there are any other separate debug info
     files that would also match.  */

  if (do_debug_links)
    printf (_("\n%s: Found separate debug info file: %s\n"), main_filename, debug_filename);
  add_separate_debug_file (debug_filename, debug_handle);

  /* Do not free debug_filename - it might be referenced inside
     the structure returned by open_debug_file().  */
  return debug_handle;
}

/* Attempt to load a separate dwarf object file.  */

static void *
load_dwo_file (const char * main_filename, const char * name, const char * dir, const char * id ATTRIBUTE_UNUSED)
{
  char * separate_filename;
  void * separate_handle;

  if (IS_ABSOLUTE_PATH (name))
    separate_filename = strdup (name);
  else
    /* FIXME: Skip adding / if dwo_dir ends in /.  */
    separate_filename = concat (dir, "/", name, NULL);
  if (separate_filename == NULL)
    {
      warn (_("Out of memory allocating dwo filename\n"));
      return NULL;
    }

  if ((separate_handle = open_debug_file (separate_filename)) == NULL)
    {
      warn (_("Unable to load dwo file: %s\n"), separate_filename);
      free (separate_filename);
      return NULL;
    }

  /* FIXME: We should check the dwo_id.  */

  printf (_("%s: Found separate debug object file: %s\n\n"), main_filename, separate_filename);

  add_separate_debug_file (separate_filename, separate_handle);
  /* Note - separate_filename will be freed in free_debug_memory().  */
  return separate_handle;
}

static void *
try_build_id_prefix (const char * prefix, char * filename, const unsigned char * data, unsigned long id_len)
{
  char * f = filename;

  f += sprintf (f, "%s.build-id/%02x/", prefix, (unsigned) *data++);
  id_len --;
  while (id_len --)
    f += sprintf (f, "%02x", (unsigned) *data++);
  strcpy (f, ".debug");

  return open_debug_file (filename);
}

/* Try to load a debug file based upon the build-id held in the .note.gnu.build-id section.  */

static void
load_build_id_debug_file (const char * main_filename ATTRIBUTE_UNUSED, void * main_file)
{
  if (! load_debug_section (note_gnu_build_id, main_file))
    return; /* No .note.gnu.build-id section.  */

  struct dwarf_section * section = & debug_displays [note_gnu_build_id].section;
  if (section == NULL)
    {
      warn (_("Unable to load the .note.gnu.build-id section\n"));
      return;
    }

  if (section->start == NULL || section->size < 0x18)
    {
      warn (_(".note.gnu.build-id section is corrupt/empty\n"));
      return;
    }

  /* In theory we should extract the contents of the section into
     a note structure and then check the fields.  For now though
     just use hard coded offsets instead:

       Field  Bytes    Contents
        NSize  0...3   4
        DSize  4...7   8+
        Type   8..11   3  (NT_GNU_BUILD_ID)
        Name   12.15   GNU\0
        Data   16....   */

  /* FIXME: Check the name size, name and type fields.  */

  unsigned long build_id_size;
  build_id_size = byte_get (section->start + 4, 4);
  if (build_id_size < 8)
    {
      warn (_(".note.gnu.build-id data size is too small\n"));
      return;
    }

  if (build_id_size > (section->size - 16))
    {
      warn (_(".note.gnu.build-id data size is too big\n"));
      return;
    }

  char * filename;
  filename = xmalloc (strlen (".build-id/")
                      + build_id_size * 2 + 2
                      + strlen (".debug")
                      /* The next string should be the same as the longest
                         name found in the prefixes[] array below.  */
                      + strlen ("/usrlib64/debug/usr")
                      + 1);
  void * handle;

  static const char * prefixes[] =
    {
      "",
      ".debug/",
      "/usr/lib/debug/",
      "/usr/lib/debug/usr/",
      "/usr/lib64/debug/",
      "/usr/lib64/debug/usr"
    };
  long unsigned int i;

  for (i = 0; i < ARRAY_SIZE (prefixes); i++)
    {
      handle = try_build_id_prefix (prefixes[i], filename,
                                    section->start + 16, build_id_size);
      if (handle != NULL)
        break;
    }
  /* FIXME: TYhe BFD library also tries a global debugfile directory prefix.  */
  if (handle == NULL)
    {
      /* Failed to find a debug file associated with the build-id.
         This is not an error however, rather it just means that
         the debug info has probably not been loaded on the system,
         or that another method is being used to link to the debug
         info.  */
      free (filename);
      return;
    }

  add_separate_debug_file (filename, handle);
}

/* Try to load a debug file pointed to by the .debug_sup section.  */

static void
load_debug_sup_file (const char * main_filename, void * file)
{
  if (! load_debug_section (debug_sup, file))
    return; /* No .debug_sup section.  */

  struct dwarf_section * section;
  section = & debug_displays [debug_sup].section;
  assert (section != NULL);

  if (section->start == NULL || section->size < 5)
    {
      warn (_(".debug_sup section is corrupt/empty\n"));
      return;
    }

  if (section->start[2] != 0)
    return; /* This is a supplementary file.  */

  const char * filename = (const char *) section->start + 3;
  if (strnlen (filename, section->size - 3) == section->size - 3)
    {
      warn (_("filename in .debug_sup section is corrupt\n"));
      return;
    }

  if (filename[0] != '/' && strchr (main_filename, '/'))
    {
      char * new_name;
      int new_len;

      new_len = asprintf (& new_name, "%.*s/%s",
                          (int) (strrchr (main_filename, '/') - main_filename),
                          main_filename,
                          filename);
      if (new_len < 3)
        {
          warn (_("unable to construct path for supplementary debug file"));
          if (new_len > -1)
            free (new_name);
          return;
        }
      filename = new_name;
    }
  else
    {
      /* PR 27796: Make sure that we pass a filename that can be free'd to
         add_separate_debug_file().  */
      filename = strdup (filename);
      if (filename == NULL)
        {
          warn (_("out of memory constructing filename for .debug_sup link\n"));
          return;
        }
    }

  void * handle = open_debug_file (filename);
  if (handle == NULL)
    {
      warn (_("unable to open file '%s' referenced from .debug_sup section\n"), filename);
      free ((void *) filename);
      return;
    }

  printf (_("%s: Found supplementary debug file: %s\n\n"), main_filename, filename);

  /* FIXME: Compare the checksums, if present.  */
  add_separate_debug_file (filename, handle);
}

/* Load a debuglink section and/or a debugaltlink section, if either are present.
   Recursively check the loaded files for more of these sections.
   Also follow any links in .debug_sup sections.
   FIXME: Should also check for DWO_* entries in the newly loaded files.  */

static void
check_for_and_load_links (void * file, const char * filename)
{
  void * handle = NULL;

  if (load_debug_section (gnu_debugaltlink, file))
    {
      Build_id_data build_id_data;

      handle = load_separate_debug_info (filename,
                                         & debug_displays[gnu_debugaltlink].section,
                                         parse_gnu_debugaltlink,
                                         check_gnu_debugaltlink,
                                         & build_id_data,
                                         file);
      if (handle)
        {
          assert (handle == first_separate_info->handle);
          check_for_and_load_links (first_separate_info->handle,
                                    first_separate_info->filename);
        }
    }

  if (load_debug_section (gnu_debuglink, file))
    {
      unsigned long crc32;

      handle = load_separate_debug_info (filename,
                                         & debug_displays[gnu_debuglink].section,
                                         parse_gnu_debuglink,
                                         check_gnu_debuglink,
                                         & crc32,
                                         file);
      if (handle)
        {
          assert (handle == first_separate_info->handle);
          check_for_and_load_links (first_separate_info->handle,
                                    first_separate_info->filename);
        }
    }

  load_debug_sup_file (filename, file);

  load_build_id_debug_file (filename, file);
}

/* Load the separate debug info file(s) attached to FILE, if any exist.
   Returns TRUE if any were found, FALSE otherwise.
   If TRUE is returned then the linked list starting at first_separate_info
   will be populated with open file handles.  */

bool
load_separate_debug_files (void * file, const char * filename)
{
  /* Skip this operation if we are not interested in debug links.  */
  if (! do_follow_links && ! do_debug_links)
    return false;

  /* See if there are any dwo links.  */
  if (load_debug_section (str, file)
      && load_debug_section (abbrev, file)
      && load_debug_section (info, file))
    {
      /* Load the .debug_addr section, if it exists.  */
      load_debug_section (debug_addr, file);
      /* Load the .debug_str_offsets section, if it exists.  */
      load_debug_section (str_index, file);
      /* Load the .debug_loclists section, if it exists.  */
      load_debug_section (loclists, file);
      /* Load the .debug_rnglists section, if it exists.  */
      load_debug_section (rnglists, file);

      free_dwo_info ();

      if (process_debug_info (& debug_displays[info].section, file, abbrev,
                              true, false))
        {
          bool introduced = false;
          dwo_info *dwinfo;
          const char *dir = NULL;
          const char *id = NULL;
          const char *name = NULL;

          for (dwinfo = first_dwo_info; dwinfo != NULL; dwinfo = dwinfo->next)
            {
              /* Accumulate NAME, DIR and ID fields.  */
              switch (dwinfo->type)
                {
                case DWO_NAME:
                  if (name != NULL)
                    warn (_("Multiple DWO_NAMEs encountered for the same CU\n"));
                  name = dwinfo->value;
                  break;

                case DWO_DIR:
                  /* There can be multiple DW_AT_comp_dir entries in a CU,
                     so do not complain.  */
                  dir = dwinfo->value;
                  break;

                case DWO_ID:
                  if (id != NULL)
                    warn (_("multiple DWO_IDs encountered for the same CU\n"));
                  id = dwinfo->value;
                  break;

                default:
                  error (_("Unexpected DWO INFO type"));
                  break;
                }

              /* If we have reached the end of our list, or we are changing
                 CUs, then display the information that we have accumulated
                 so far.  */
              if (name != NULL
                  && (dwinfo->next == NULL
                      || dwinfo->next->cu_offset != dwinfo->cu_offset))
                {
                  if (do_debug_links)
                    {
                      if (! introduced)
                        {
                          printf (_("The %s section contains link(s) to dwo file(s):\n\n"),
                                  debug_displays [info].section.uncompressed_name);
                          introduced = true;
                        }

                      printf (_("  Name:      %s\n"), name);
                      printf (_("  Directory: %s\n"), dir ? dir : _("<not-found>"));
                      if (id != NULL)
                        display_data (printf (_("  ID:       ")), (unsigned char *) id, 8);
                      else if (debug_information[0].dwarf_version != 5)
                        printf (_("  ID:        <not specified>\n"));
                      printf ("\n\n");
                    }

                  if (do_follow_links)
                    load_dwo_file (filename, name, dir, id);

                  name = dir = id = NULL;
                }
            }
        }
    }

  if (! do_follow_links)
    /* The other debug links will be displayed by display_debug_links()
       so we do not need to do any further processing here.  */
    return false;

  /* FIXME: We do not check for the presence of both link sections in the same file.  */
  /* FIXME: We do not check for the presence of multiple, same-name debuglink sections.  */
  /* FIXME: We do not check for the presence of a dwo link as well as a debuglink.  */

  check_for_and_load_links (file, filename);
  if (first_separate_info != NULL)
    return true;

  do_follow_links = 0;
  return false;
}

void
free_debug_memory (void)
{
  unsigned int i;

  free_all_abbrevs ();

  free (shndx_pool);
  shndx_pool = NULL;
  shndx_pool_size = 0;
  shndx_pool_used = 0;
  free (cu_sets);
  cu_sets = NULL;
  cu_count = 0;
  free (tu_sets);
  tu_sets = NULL;
  tu_count = 0;

  memset (level_type_signed, 0, sizeof level_type_signed);
  cu_tu_indexes_read = -1;

  for (i = 0; i < max; i++)
    free_debug_section ((enum dwarf_section_display_enum) i);

  if (debug_information != NULL)
    {
      for (i = 0; i < alloc_num_debug_info_entries; i++)
        free_debug_information (&debug_information[i]);
      free (debug_information);
      debug_information = NULL;
      alloc_num_debug_info_entries = num_debug_info_entries = 0;
    }

  separate_info * d;
  separate_info * next;

  for (d = first_separate_info; d != NULL; d = next)
    {
      close_debug_file (d->handle);
      free ((void *) d->filename);
      next = d->next;
      free ((void *) d);
    }
  first_separate_info = NULL;

  free_dwo_info ();
}

typedef struct
{
  const char letter;
  const char *option;
  int *variable;
  int val;
} debug_dump_long_opts;

static const debug_dump_long_opts debug_option_table[] =
{
  { 'A', "addr", &do_debug_addr, 1 },
  { 'a', "abbrev", &do_debug_abbrevs, 1 },
  { 'c', "cu_index", &do_debug_cu_index, 1 },
#ifdef HAVE_LIBDEBUGINFOD
  { 'D', "use-debuginfod", &use_debuginfod, 1 },
  { 'E', "do-not-use-debuginfod", &use_debuginfod, 0 },
#endif
  { 'F', "frames-interp", &do_debug_frames_interp, 1 },
  { 'f', "frames", &do_debug_frames, 1 },
  { 'g', "gdb_index", &do_gdb_index, 1 },
  { 'i', "info", &do_debug_info, 1 },
  { 'K', "follow-links", &do_follow_links, 1 },
  { 'k', "links", &do_debug_links, 1 },
  { 'L', "decodedline", &do_debug_lines, FLAG_DEBUG_LINES_DECODED },
  { 'l', "rawline", &do_debug_lines, FLAG_DEBUG_LINES_RAW },
  /* For compatibility with earlier versions of readelf.  */
  { 'l', "line", &do_debug_lines, FLAG_DEBUG_LINES_RAW },
  { 'm', "macro", &do_debug_macinfo, 1 },
  { 'N', "no-follow-links", &do_follow_links, 0 },
  { 'O', "str-offsets", &do_debug_str_offsets, 1 },
  { 'o', "loc", &do_debug_loc, 1 },
  { 'p', "pubnames", &do_debug_pubnames, 1 },
  { 'R', "Ranges", &do_debug_ranges, 1 },
  { 'r', "aranges", &do_debug_aranges, 1 },
  /* For compatibility with earlier versions of readelf.  */
  { 'r', "ranges", &do_debug_aranges, 1 },
  { 's', "str", &do_debug_str, 1 },
  { 'T', "trace_aranges", &do_trace_aranges, 1 },
  { 't', "pubtypes", &do_debug_pubtypes, 1 },
  { 'U', "trace_info", &do_trace_info, 1 },
  { 'u', "trace_abbrev", &do_trace_abbrevs, 1 },
  { 0, NULL, NULL, 0 }
};

/* Enable display of specific DWARF sections as determined by the comma
   separated strings in NAMES.  Returns non-zero if any displaying was
   enabled.  */

int
dwarf_select_sections_by_names (const char *names)
{
  const char *p;
  int result = 0;

  p = names;
  while (*p)
    {
      const debug_dump_long_opts *entry;

      for (entry = debug_option_table; entry->option; entry++)
        {
          size_t len = strlen (entry->option);

          if (strncmp (p, entry->option, len) == 0
              && (p[len] == ',' || p[len] == '\0'))
            {
              if (entry->val == 0)
                * entry->variable = 0;
              else
                * entry->variable = entry->val;
              result |= entry->val;

              p += len;
              break;
            }
        }

      if (entry->option == NULL)
        {
          warn (_("Unrecognized debug option '%s'\n"), p);
          p = strchr (p, ',');
          if (p == NULL)
            break;
        }

      if (*p == ',')
        p++;
    }

  /* The --debug-dump=frames-interp option also enables the
     --debug-dump=frames option.  */
  if (do_debug_frames_interp)
    do_debug_frames = 1;

  return result;
}

/* Enable display of specific DWARF sections as determined by the characters
   in LETTERS.  Returns non-zero if any displaying was enabled.  */

int
dwarf_select_sections_by_letters (const char *letters)
{
  int result = 0;

  while (* letters)
    {
      const debug_dump_long_opts *entry;

      for (entry = debug_option_table; entry->letter; entry++)
        {
          if (entry->letter == * letters)
            {
              if (entry->val == 0)
                * entry->variable = 0;
              else
                * entry->variable |= entry->val;
              result |= entry->val;
              break;
            }
        }

      if (entry->letter == 0)
        warn (_("Unrecognized debug letter option '%c'\n"), * letters);

      letters ++;
    }

  /* The --debug-dump=frames-interp option also enables the
     --debug-dump=frames option.  */
  if (do_debug_frames_interp)
    do_debug_frames = 1;

  return result;
}

void
dwarf_select_sections_all (void)
{
  do_debug_info = 1;
  do_debug_abbrevs = 1;
  do_debug_lines = FLAG_DEBUG_LINES_RAW;
  do_debug_pubnames = 1;
  do_debug_pubtypes = 1;
  do_debug_aranges = 1;
  do_debug_ranges = 1;
  do_debug_frames = 1;
  do_debug_macinfo = 1;
  do_debug_str = 1;
  do_debug_loc = 1;
  do_gdb_index = 1;
  do_trace_info = 1;
  do_trace_abbrevs = 1;
  do_trace_aranges = 1;
  do_debug_addr = 1;
  do_debug_cu_index = 1;
  do_follow_links = 1;
  do_debug_links = 1;
  do_debug_str_offsets = 1;
}

#define NO_ABBREVS   NULL, NULL, NULL, 0, 0, 0, NULL, 0
#define ABBREV(N)    NULL, NULL, NULL, 0, 0, N, NULL, 0

/* N.B. The order here must match the order in section_display_enum.  */

struct dwarf_section_display debug_displays[] =
{
  { { ".debug_abbrev",      ".zdebug_abbrev",        ".dwabrev", NO_ABBREVS },      display_debug_abbrev,   &do_debug_abbrevs,  false },
  { { ".debug_aranges",     ".zdebug_aranges",       ".dwarnge", NO_ABBREVS },      display_debug_aranges,  &do_debug_aranges,  true },
  { { ".debug_frame",       ".zdebug_frame",         ".dwframe", NO_ABBREVS },      display_debug_frames,   &do_debug_frames,   true },
  { { ".debug_info",        ".zdebug_info",          ".dwinfo",  ABBREV (abbrev)},  display_debug_info,     &do_debug_info,     true },
  { { ".debug_line",        ".zdebug_line",          ".dwline",  NO_ABBREVS },      display_debug_lines,    &do_debug_lines,    true },
  { { ".debug_pubnames",    ".zdebug_pubnames",      ".dwpbnms", NO_ABBREVS },      display_debug_pubnames, &do_debug_pubnames, false },
  { { ".debug_gnu_pubnames", ".zdebug_gnu_pubnames", "",         NO_ABBREVS },      display_debug_gnu_pubnames, &do_debug_pubnames, false },
  { { ".eh_frame",          "",                      "",         NO_ABBREVS },      display_debug_frames,   &do_debug_frames,   true },
  { { ".debug_macinfo",     ".zdebug_macinfo",       "",         NO_ABBREVS },      display_debug_macinfo,  &do_debug_macinfo,  false },
  { { ".debug_macro",       ".zdebug_macro",         ".dwmac",   NO_ABBREVS },      display_debug_macro,    &do_debug_macinfo,  true },
  { { ".debug_str",         ".zdebug_str",           ".dwstr",   NO_ABBREVS },      display_debug_str,      &do_debug_str,      false },
  { { ".debug_line_str",    ".zdebug_line_str",      "",         NO_ABBREVS },      display_debug_str,      &do_debug_str,      false },
  { { ".debug_loc",         ".zdebug_loc",           ".dwloc",   NO_ABBREVS },      display_debug_loc,      &do_debug_loc,      true },
  { { ".debug_loclists",    ".zdebug_loclists",      "",         NO_ABBREVS },      display_debug_loc,      &do_debug_loc,      true },
  { { ".debug_loclists.dwo", ".zdebug_loclists.dwo", "",         NO_ABBREVS },      display_debug_loc,      &do_debug_loc,      true },
  { { ".debug_pubtypes",    ".zdebug_pubtypes",      ".dwpbtyp", NO_ABBREVS },      display_debug_pubnames, &do_debug_pubtypes, false },
  { { ".debug_gnu_pubtypes", ".zdebug_gnu_pubtypes", "",         NO_ABBREVS },      display_debug_gnu_pubnames, &do_debug_pubtypes, false },
  { { ".debug_ranges",      ".zdebug_ranges",        ".dwrnges", NO_ABBREVS },      display_debug_ranges,   &do_debug_ranges,   true },
  { { ".debug_rnglists",    ".zdebug_rnglists",      "",         NO_ABBREVS },      display_debug_ranges,   &do_debug_ranges,   true },
  { { ".debug_rnglists.dwo", ".zdebug_rnglists.dwo", "",         NO_ABBREVS },      display_debug_ranges,   &do_debug_ranges,   true },
  { { ".debug_static_func", ".zdebug_static_func",   "",         NO_ABBREVS },      display_debug_not_supported, NULL,          false },
  { { ".debug_static_vars", ".zdebug_static_vars",   "",         NO_ABBREVS },      display_debug_not_supported, NULL,          false },
  { { ".debug_types",       ".zdebug_types",         "",         ABBREV (abbrev) }, display_debug_types,    &do_debug_info,     true },
  { { ".debug_weaknames",   ".zdebug_weaknames",     "",         NO_ABBREVS },      display_debug_not_supported, NULL,          false },
  { { ".gdb_index",         "",                      "",         NO_ABBREVS },      display_gdb_index,      &do_gdb_index,      false },
  { { ".debug_names",       "",                      "",         NO_ABBREVS },      display_debug_names,    &do_gdb_index,      false },
  { { ".trace_info",        "",                      "",         ABBREV (trace_abbrev) }, display_trace_info, &do_trace_info,   true },
  { { ".trace_abbrev",      "",                      "",         NO_ABBREVS },      display_debug_abbrev,   &do_trace_abbrevs,  false },
  { { ".trace_aranges",     "",                      "",         NO_ABBREVS },      display_debug_aranges,  &do_trace_aranges,  false },
  { { ".debug_info.dwo",    ".zdebug_info.dwo",      "",         ABBREV (abbrev_dwo) }, display_debug_info, &do_debug_info,     true },
  { { ".debug_abbrev.dwo",  ".zdebug_abbrev.dwo",    "",         NO_ABBREVS },    display_debug_abbrev,     &do_debug_abbrevs,  false },
  { { ".debug_types.dwo",   ".zdebug_types.dwo",     "",         ABBREV (abbrev_dwo) }, display_debug_types, &do_debug_info,    true },
  { { ".debug_line.dwo",    ".zdebug_line.dwo",      "",         NO_ABBREVS },      display_debug_lines,    &do_debug_lines,    true },
  { { ".debug_loc.dwo",     ".zdebug_loc.dwo",       "",         NO_ABBREVS },      display_debug_loc,      &do_debug_loc,      true },
  { { ".debug_macro.dwo",   ".zdebug_macro.dwo",     "",         NO_ABBREVS },      display_debug_macro,    &do_debug_macinfo,  true },
  { { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo",   "",         NO_ABBREVS },      display_debug_macinfo,  &do_debug_macinfo,  false },
  { { ".debug_str.dwo",     ".zdebug_str.dwo",       "",         NO_ABBREVS },      display_debug_str,      &do_debug_str,      true },
  { { ".debug_str_offsets", ".zdebug_str_offsets",   "",         NO_ABBREVS },      display_debug_str_offsets, &do_debug_str_offsets, true },
  { { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo", "",   NO_ABBREVS },      display_debug_str_offsets, &do_debug_str_offsets, true },
  { { ".debug_addr",        ".zdebug_addr",          "",         NO_ABBREVS },      display_debug_addr,     &do_debug_addr,     true },
  { { ".debug_cu_index",    "",                      "",         NO_ABBREVS },      display_cu_index,       &do_debug_cu_index, false },
  { { ".debug_tu_index",    "",                      "",         NO_ABBREVS },      display_cu_index,       &do_debug_cu_index, false },
  { { ".gnu_debuglink",     "",                      "",         NO_ABBREVS },      display_debug_links,    &do_debug_links,    false },
  { { ".gnu_debugaltlink",  "",                      "",         NO_ABBREVS },      display_debug_links,    &do_debug_links,    false },
  { { ".debug_sup",         "",                      "",         NO_ABBREVS },      display_debug_sup,      &do_debug_links,    false },
  /* Separate debug info files can containt their own .debug_str section,
     and this might be in *addition* to a .debug_str section already present
     in the main file.  Hence we need to have two entries for .debug_str.  */
  { { ".debug_str",         ".zdebug_str",           "",         NO_ABBREVS },      display_debug_str,      &do_debug_str,      false },
  { { ".note.gnu.build-id", "",                      "",         NO_ABBREVS },      display_debug_not_supported, NULL,          false },
};

/* A static assertion.  */
extern int debug_displays_assert[ARRAY_SIZE (debug_displays) == max ? 1 : -1];