dwarf_attr(3) [freebsd man page]

DWARF_ATTR(3)						   BSD Library Functions Manual 					     DWARF_ATTR(3)

NAME

     dwarf_attr -- retrieve an attribute descriptor associated with a DWARF debugging information entry

LIBRARY

     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

     #include <libdwarf.h>

     int
     dwarf_attr(Dwarf_Die die, Dwarf_Half attr, Dwarf_Attribute *atp, Dwarf_Error *err);

DESCRIPTION

     Function dwarf_attr() retrieves the attribute descriptor for an attribute associated with the DWARF debugging information entry descriptor in
     argument die.

     DWARF attribute descriptors are represented by value of the opaque type Dwarf_Attribute, see dwarf(3).

     Argument attr names the desired DWARF attribute.  Legal values for argument attr are those denoted by the DW_AT_* constants in the DWARF
     specification.

     Argument atp points to a location into which the returned attribute descriptor will be written.  The returned descriptor may then be passed
     to the form query functions in the dwarf(3) API set to access the data associated with the attribute.

     If argument err is non-NULL, it will be used to return an error descriptor in case of an error.

RETURN VALUES

     Function dwarf_attr() returns DW_DLV_OK on success.

     If the debugging information entry descriptor denoted by argument die does not contain the named attribute, the function returns
     DW_DLV_NO_ENTRY and sets argument err.  For other errors, it returns DW_DLV_ERROR and sets argument err.

ERRORS

     Function dwarf_attr() can fail with the following errors:

     [DW_DLE_ARGUMENT]	Either of arguments die or atp was NULL.

     [DW_DLE_NO_ENTRY]	Argument die had no attribute corresponding to the value in argument attr.

SEE ALSO

     dwarf(3), dwarf_attrlist(3), dwarf_attroffset(3), dwarf_hasattr(3), dwarf_hasform(3), dwarf_whatattr(3), dwarf_whatform(3)

BSD
								   April 8, 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