Function build_address_map

external/tracy/libbacktrace/dwarf.cpp:2416–2591

   on success, 0 on failure.  */

static int
build_address_map (struct backtrace_state *state, uintptr_t base_address,
		   const struct dwarf_sections *dwarf_sections,
		   int is_bigendian, struct dwarf_data *altlink,
		   backtrace_error_callback error_callback, void *data,
		   struct unit_addrs_vector *addrs,
		   struct unit_vector *unit_vec)
{
  struct dwarf_buf info;
  struct backtrace_vector units;
  size_t units_count;
  size_t i;
  struct unit **pu;
  size_t unit_offset = 0;

  memset (&addrs->vec, 0, sizeof addrs->vec);
  memset (&unit_vec->vec, 0, sizeof unit_vec->vec);
  addrs->count = 0;
  unit_vec->count = 0;

  /* Read through the .debug_info section.  FIXME: Should we use the
     .debug_aranges section?  gdb and addr2line don't use it, but I'm
     not sure why.  */

  info.name = ".debug_info";
  info.start = dwarf_sections->data[DEBUG_INFO];
  info.buf = info.start;
  info.left = dwarf_sections->size[DEBUG_INFO];
  info.is_bigendian = is_bigendian;
  info.error_callback = error_callback;
  info.data = data;
  info.reported_underflow = 0;

  memset (&units, 0, sizeof units);
  units_count = 0;

  while (info.left > 0)
    {
      const unsigned char *unit_data_start;
      uint64_t len;
      int is_dwarf64;
      struct dwarf_buf unit_buf;
      int version;
      int unit_type;
      uint64_t abbrev_offset;
      int addrsize;
      struct unit *u;
      enum dwarf_tag unit_tag;

      if (info.reported_underflow)
	goto fail;

      unit_data_start = info.buf;

      len = read_initial_length (&info, &is_dwarf64);
      unit_buf = info;
      unit_buf.left = len;