dwarf_get_arange_info(3) [freebsd man page]

DWARF_GET_ARANGE_INFO(3)				   BSD Library Functions Manual 				  DWARF_GET_ARANGE_INFO(3)

NAME

     dwarf_get_arange_info -- extract address range information from a descriptor

LIBRARY

     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

     #include <libdwarf.h>

     int
     dwarf_get_arange_info(Dwarf_Arange ar, Dwarf_Addr *start, Dwarf_Unsigned *length, Dwarf_Off *cu_die_offset, Dwarf_Error *err);

DESCRIPTION

     Function dwarf_get_arange_info() extracts address range information from a Dwarf_Arange descriptor.

     Argument ar should reference a valid Dwarf_Arange descriptor returned by function dwarf_get_aranges(3).

     Argument start should point to a location which will hold the start value of the address range associated with the descriptor.

     Argument length should point to a location which will hold the length in bytes of the address range associated with the descriptor.

     Argument cu_die_offset should point to a location which will be set to an offset, relative to the ``.debug_info'' section, of the first
     debugging information entry in the compilation unit associated with argument ar.

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

RETURN VALUES

     Function dwarf_get_arange_info() returns DW_DLV_OK when it succeeds.  In case of an error, it returns DW_DLV_ERROR and sets the argument err.

ERRORS

     Function dwarf_get_arange_info() can fail with:

     [DW_DLE_ARGUMENT]	One of the arguments ar, start, length or cu_die_offset was NULL.

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_aranges(3), dwarf_get_arange_cu_header_offset(3), dwarf_get_cu_die_offset(3)

BSD
								  April 16, 2011							       BSD

DWARF_GET_LOCLIST_ENTRY(3)				   BSD Library Functions Manual 				DWARF_GET_LOCLIST_ENTRY(3)

NAME

     dwarf_get_loclist_entry -- retrieve DWARF location list entry

LIBRARY

     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

     #include <libdwarf.h>

     int
     dwarf_get_loclist_entry(Dwarf_Debug dbg, Dwarf_Unsigned offset, Dwarf_Addr *hipc, Dwarf_Addr *lopc, Dwarf_Ptr *data,
	 Dwarf_Unsigned *entry_len, Dwarf_Unsigned *next_entry, Dwarf_Error *err);

DESCRIPTION

     Function dwarf_get_loclist_entry() retrieves a location list entry from the DWARF section ``.debug_loc''.

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

     Argument offset is an offset, relative to the ``.debug_loc'' section, to the start of the desired location list entry.

     Argument hipc should point to a location which will hold the offset, relative to the base address of the location list entry, of the highest
     program counter value for the entry.

     Argument lowpc should point to a location which will hold the offset, relative to the base address of the location list entry, of the lowest
     program counter value for the entry.

     Argument data should point to a location which will be set to a pointer to the location list data.

     Argument entry_len should point to a location which will hold the length in bytes of the location list data returned in argument data.

     Argument next_entry should point to a location which will hold the offset of the next location list entry.

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

RETURN VALUES

     Function dwarf_get_loclist_entry() returns DW_DLV_OK when it succeeds.  It returns DW_DLV_NO_ENTRY if there is no location list at the speci-
     fied offset offset.  In case of an error, it returns DW_DLV_ERROR and sets the argument err.

ERRORS

     Function dwarf_get_loclist_entry() can fail with:

     [DW_DLE_ARGUMENT]	One of the arguments dbg, hipc, lopc, data, entry_len or next_entry was NULL.

     [DW_DLE_NO_ENTRY]	There is no location list at the specified offset offset.

EXAMPLE

     To iterate through all the location list entries in the ``.debug_loc'' section, use:

	   Dwarf_Debug dbg;
	   Dwarf_Unsigned off, len, next;
	   Dwarf_Addr hipc, lopc;
	   Dwarf_Ptr data;
	   Dwarf_Error de;
	   int ret;

	   off = 0;
	   while ((ret = dwarf_get_loclist_entry(dbg, off, &hipc, &lopc, &data,
	       &len, &next, &de)) == DW_DLV_OK) {
		   /* ... use loclist entry ... */
		   off = next;
	   }
	   if (ret == DW_DLV_ERROR)
		   warnx("dwarf_get_loclist_entry failed: %s", dwarf_errmsg(de));

SEE ALSO

     dwarf(3), dwarf_loclist(3), dwarf_loclist_n(3), dwarf_loclist_from_expr(3), dwarf_loclist_from_expr_a(3)

BSD
								   July 6, 2011 							       BSD