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dwarf_get_abbrev_entry(3) [freebsd man page]

DWARF_GET_ABBREV_ENTRY(3)				   BSD Library Functions Manual 				 DWARF_GET_ABBREV_ENTRY(3)

NAME
dwarf_get_abbrev_entry -- retrieve attribute information from an abbreviation descriptor LIBRARY
DWARF Access Library (libdwarf, -ldwarf) SYNOPSIS
#include <libdwarf.h> int dwarf_get_abbrev_entry(Dwarf_Abbrev abbrev, Dwarf_Signed ndx, Dwarf_Half *code, Dwarf_Signed *form, Dwarf_Off *offset, Dwarf_Error *err); DESCRIPTION
Function dwarf_get_abbrev_entry() retrieves attribute information from a DWARF abbreviation descriptor. Argument abbrev should be a valid abbreviation descriptor, as returned by function dwarf_get_abbrev(3). Argument ndx specifies the 0-based index of the attribute. The total count of the attributes contained in the abbreviation entry can be retrieved using the function dwarf_get_abbrev(3). Argument code should point to a location which will hold a returned attribute code. Argument form should point to a location which will hold the returned form of the attribute. Argument offset should point to a location which will hold a returned offset, relative to the ``.debug_abbrev'' section, for the specified attribute. If argument err is not NULL, it will be used to return an error descriptor in case of an error. RETURN VALUES
Function dwarf_get_abbrev_entry() returns DW_DLV_OK when it succeeds. It returns DW_DLV_NO_ENTRY if the attribute index specified by argu- ment ndx is out of range. In case of an error, it returns DW_DLV_ERROR and sets the argument err. ERRORS
Function dwarf_get_abbrev_entry() can fail with: [DW_DLE_ARGUMENT] One of the arguments abbrev, code, form or offset was NULL. [DW_DLE_NO_ENTRY] The attribute index specified by argument ndx was out of range. EXAMPLE
To loop through all the attribute entries contained in the abbreviation section, use: Dwarf_Debug dbg; Dwarf_Abbrev ab; Dwarf_Off aboff, atoff; Dwarf_Signed form; Dwarf_Half attr; Dwarf_Unsigned length, attr_count; Dwarf_Error de; int i, ret; /* ...allocate 'dbg' using dwarf_init(3) ... */ while ((ret = dwarf_next_cu_header(dbg, NULL, NULL, &aboff, NULL, NULL, &de)) == DW_DLV_OK) { while ((ret = dwarf_get_abbrev(dbg, aboff, &ab, &length, &attr_count, &de)) == DW_DLV_OK) { if (length == 1) /* Last entry. */ break; aboff += length; for (i = 0; (Dwarf_Unsigned) i < attr_count; i++) { if (dwarf_get_abbrev_entry(ab, i, &attr, &form, &atoff, &de) != DW_DLV_OK) { warnx("dwarf_get_abbrev_entry failed:" " %s", dwarf_errmsg(de)); continue; } /* .. use the retrieved information ... */ } } if (ret != DW_DLV_OK) warnx("dwarf_get_abbrev: %s", dwarf_errmsg(de)); } if (ret == DW_DLV_ERROR) warnx("dwarf_next_cu_header: %s", dwarf_errmsg(de)); SEE ALSO
dwarf(3), dwarf_get_abbrev(3) BSD
April 02, 2011 BSD

Check Out this Related Man Page

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

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