dwarf_get_cu_die_offset(3) [freebsd man page]

DWARF_GET_CU_DIE_OFFSET(3)				   BSD Library Functions Manual 				DWARF_GET_CU_DIE_OFFSET(3)

NAME

     dwarf_get_arange_cu_header_offset, dwarf_get_cu_die_offset -- retrieve compilation unit offsets

LIBRARY

     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

     #include <libdwarf.h>

     int
     dwarf_get_arange_cu_header_offset(Dwarf_Arange ar, Dwarf_Off *ret, Dwarf_Error *err);

     int
     dwarf_get_cu_die_offset(Dwarf_Arange ar, Dwarf_Off *ret, Dwarf_Error *err);

DESCRIPTION

     These functions retrieve the offsets, relative to the ``.debug_info'' DWARF section, of the debugging information entries describing the com-
     pilation unit associated with a Dwarf_Arange descriptor.

     Function dwarf_get_arange_cu_header_offset() retrieves the offset of the compilation unit header associated with argument ar, and stores it
     in the location pointed to by argument ret.

     Function dwarf_get_cu_die_offset() retrieves the offset of the debugging information entry for the compilation unit associated with argument
     ar, and stores it in the location pointed to by argument ret.

     If argument err is not NULL, these functions will use it to store error information, in case of an error.

RETURN VALUES

     On success, these functions returns DW_DLV_OK.  In case of an error, they return DW_DLV_ERROR and set the argument err.

ERRORS

     These functions may fail with:

     [DW_DLE_ARGUMENT]	Argument ar was not a valid Dwarf_Arange descriptor.

     [DW_DLE_ARGUMENT]	Argument ret was NULL.

SEE ALSO

     dwarf(3), dwarf_get_arange(3), dwarf_get_arange_info(3), dwarf_get_aranges(3)

BSD
								  April 10, 2011							       BSD

DWARF_GET_ARANGES(3)					   BSD 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 asso-
     ciated with the specified debugging context.  In case of an error, it returns DW_DLV_ERROR and sets the argument err.

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.

EXAMPLE

     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. */
	   }

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)

BSD
								 November 9, 2011							       BSD