dwarf_formref(3) [freebsd man page]

DWARF_FORMREF(3)					   BSD Library Functions Manual 					  DWARF_FORMREF(3)

NAME

     dwarf_formref, dwarf_global_formref -- retrieve offsets for REFERENCE class attributes

LIBRARY

     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

     #include <libdwarf.h>

     int
     dwarf_formref(Dwarf_Attribute attr, Dwarf_Off *retoffset, Dwarf_Error *err);

     int
     dwarf_global_formref(Dwarf_Attribute attr, Dwarf_Off *retoffset, Dwarf_Error *err);

DESCRIPTION

     These functions return the offsets associated with a DWARF attribute descriptor.

     Function dwarf_formref() returns the compilation unit relative offset of the descriptor referenced by argument attr in the location pointed
     to by argument retoffset.	Argument attr must be a reference that is local to a compilation unit.	Permitted forms for argument attr are
     DW_FORM_ref1, DW_FORM_ref2, DW_FORM_ref4, DW_FORM_ref8 and DW_FORM_ref_udata.

     Function dwarf_global_formref() returns the section-relative offset of the descriptor referenced by argument attr in the location pointed to
     by argument retoffset.  Argument attr should be a legal REFERENCE class form.  Permitted forms for argument attr are: DW_FORM_ref_addr,
     DW_FORM_ref_udata, DW_FORM_ref1, DW_FORM_ref2, DW_FORM_ref4, DW_FORM_ref8 and DW_FORM_sec_offset.	The returned offset is relative to the
     start of the ``.debug_info'' ELF section.

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

RETURN VALUES

     These functions return DW_DLV_OK on success.  In case of an error, these functions return DW_DLV_ERROR and sets argument err.

ERRORS

     These functions may fail with the following errors:

     [DW_DLE_ARGUMENT]	     Either of arguments attr or retoffset was NULL.

     [DW_DLE_ATTR_FORM_BAD]  The attribute referenced by argument attr was not of a permitted kind.

SEE ALSO

     dwarf(3), dwarf_attr(3), dwarf_formblock(3), dwarf_formflag(3), dwarf_formsdata(3), dwarf_formsig8(3), dwarf_formstring(3),
     dwarf_formudata(3), dwarf_hasattr(3)

BSD
								   June 21, 2010							       BSD

DWARF_HASFORM(3)					   BSD Library Functions Manual 					  DWARF_HASFORM(3)

NAME

     dwarf_hasform, dwarf_whatform, dwarf_whatform_direct -- query attribute forms

LIBRARY

     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

     #include <libdwarf.h>

     int
     dwarf_hasform(Dwarf_Attribute attr, Dwarf_Half form, Dwarf_Bool *ret, Dwarf_Error *err);

     int
     dwarf_whatform(Dwarf_Attribute attr, Dwarf_Half *retform, Dwarf_Error *err);

     int
     dwarf_whatform_direct(Dwarf_Attribute attr, Dwarf_Half *retform, Dwarf_Error *err);

DESCRIPTION

     Function dwarf_hasform() indicates whether the DWARF attribute denoted by argument attr has the attribute form specified by argument form.
     If the attribute has the specified form, then argument ret is set to a non-zero value, otherwise it is set to zero.  If argument err is non-
     NULL, it will be used to return an error descriptor in case of an error.

     Function dwarf_whatform() sets the location specified by argument retform to the attribute form code for the DWARF attribute referenced by
     argument attr.  If the attribute referenced by argument attr has an indirect form attribute, this function will return the final form for the
     attribute.  If argument err is non-NULL, it will be used to return an error descriptor in case of an error.

     Function dwarf_whatform_direct() sets the location specified by argument retform to the attribute form code for the DWARF attribute refer-
     enced by argument attr.  If the form is an indirect form, the function sets the location specified by argument retform to DW_FORM_indirect.
     If argument err is non-NULL, it will be used to return an error descriptor in case of an error.

RETURN VALUES

     These functions return DW_DLV_OK on success.  In case of an error, these functions return DW_DLV_ERR and set argument err.

ERRORS

     These functions may fail with the following errors:

     [DW_DLE_ARGUMENT]	Any of the arguments attr, ret, or retform was NULL.

SEE ALSO

     dwarf(3), dwarf_attr(3), dwarf_hasattr(3)

BSD
								   May 22, 2010 							       BSD