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DWARF_GET_ARANGES(3)       Library Functions Manual       DWARF_GET_ARANGES(3)

NAME
     dwarf_get_aranges - retrieve program address space mappings

LIBRARY
     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS
     #include <libdwarf.h>

     int
     dwarf_get_aranges(Dwarf_Debug dbg, Dwarf_Arange **ar_list,
         Dwarf_Signed *ar_cnt, Dwarf_Error *err);

DESCRIPTION
     The function dwarf_get_aranges() retrieves address range information from
     the ".debug_aranges" DWARF section.  Information about address ranges is
     returned using opaque descriptors of type Dwarf_Arange,

     Argument dbg should reference a DWARF debug context allocated using
     dwarf_init(3).

     Argument ar_list should point to a location which will be set to a
     pointer to an array of Dwarf_Arange descriptors.

     Argument ar_cnt should point to a location which will be set to the
     number of descriptors returned.

     If argument err is not NULL, it will be used to store error information
     in case of an error.

   Memory Management
     The memory area used for the array returned in argument ar_list is owned
     by DWARF Access Library (libdwarf, -ldwarf).  Application code should not
     attempt to directly free this area.  Portable applications should instead
     use dwarf_dealloc(3) to indicate that the memory area may be freed.

RETURN VALUES
     Function dwarf_get_aranges() returns DW_DLV_OK when it succeeds.  It
     returns DW_DLV_NO_ENTRY if there is no ".debug_aranges" section
     associated with the specified debugging context.  In case of an error, it
     returns DW_DLV_ERROR and sets the argument err.

EXAMPLES
     To loop through all the address lookup table entries, use:

           Dwarf_Debug dbg;
           Dwarf_Addr start;
           Dwarf_Arange *aranges;
           Dwarf_Off die_off;
           Dwarf_Signed i, cnt;
           Dwarf_Unsigned length;
           Dwarf_Error de;

           if (dwarf_get_aranges(dbg, &aranges, &cnt, &de) != DW_DLV_OK)
                   errx(EXIT_FAILURE, "dwarf_get_aranges: %s",
                       dwarf_errmsg(de));

           for (i = 0; i < cnt; i++) {
                   if (dwarf_get_arange_info(aranges[i], &start, &length,
                       &die_off, &de) != DW_DLV_OK) {
                           warnx("dwarf_get_arange_info: %s",
                               dwarf_errmsg(de));
                           continue;
                   }
                   /* Do something with the returned information. */
           }

ERRORS
     Function dwarf_get_aranges() can fail with:

     [DW_DLE_ARGUMENT]       One of the arguments dbg, ar_list or ar_cnt was
                             NULL.

     [DW_DLE_NO_ENTRY]       The debugging context dbg did not contain a
                             ".debug_aranges" string section.

SEE ALSO
     dwarf(3), dwarf_get_arange(3), dwarf_get_arange_cu_header_offset(3),
     dwarf_get_arange_info(3), dwarf_get_cu_die_offset(3)

NetBSD 10.99                   November 9, 2011                   NetBSD 10.99