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dwarf_attr(3) [freebsd man page]

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

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

Check Out this Related Man Page

DWARF_HIGHPC(3) 					   BSD Library Functions Manual 					   DWARF_HIGHPC(3)

dwarf_arrayorder, dwarf_bitoffset, dwarf_bitsize, dwarf_bytesize, dwarf_highpc, dwarf_highpc_b, dwarf_lowpc, dwarf_srclang -- retrieve the value of a DWARF attribute LIBRARY
DWARF Access Library (libdwarf, -ldwarf) SYNOPSIS
#include <libdwarf.h> int dwarf_arrayorder(Dwarf_Die die, Dwarf_Unsigned *ret_order, Dwarf_Error *err); int dwarf_bitoffset(Dwarf_Die die, Dwarf_Unsigned *ret_size, Dwarf_Error *err); int dwarf_bitsize(Dwarf_Die die, Dwarf_Unsigned *ret_size, Dwarf_Error *err); int dwarf_bytesize(Dwarf_Die die, Dwarf_Unsigned *ret_size, Dwarf_Error *err); int dwarf_highpc(Dwarf_Die die, Dwarf_Addr *ret_highpc, Dwarf_Error *err); int dwarf_highpc_b(Dwarf_Die die, Dwarf_Addr *ret_highpc, Dwarf_Half *ret_form, enum Dwarf_Form_Class *ret_class, Dwarf_Error *err); int dwarf_lowpc(Dwarf_Die die, Dwarf_Addr *ret_lowpc, Dwarf_Error *err); int dwarf_srclang(Dwarf_Die die, Dwarf_Unsigned *ret_lang, Dwarf_Error *err); DESCRIPTION
These convenience functions are used to retrieve DWARF attribute values associated with a Debugging Information Entry (DIE) descriptor denoted by argument die. These functions store the value of the requested attribute into the location pointed to by their second argument, provided that the requested attribute exists in the debugging information entry. The list of functions and the DWARF attribute that they retrieve are: dwarf_arrayorder() Retrieve the DW_AT_ordering attribute value. dwarf_bitoffset() Retrieve the DW_AT_bit_offset attribute value. dwarf_bitsize() Retrieve the DW_AT_bit_size attribute value. dwarf_bytesize() Retrieve the DW_AT_byte_size attribute value. dwarf_highpc() Retrieve the DW_AT_high_pc attribute value. dwarf_highpc_b() Retrieve the DW_AT_high_pc attribute value. dwarf_lowpc() Retrieve the DW_AT_low_pc attribute value. dwarf_srclang() Retrieve the DW_AT_language attribute value. Function dwarf_highpc_b() is an enhanced version of function dwarf_highpc(). It sets the location specified by argument ret_form to the form code of the attribute DW_AT_high_pc, and sets the location specified by argument ret_class to the class of that form. A value of NULL may be used for either of the arguments ret_form or ret_class if the caller is not interested in the respective value. RETURN VALUES
These functions return DW_DLV_OK on success. If the debugging information entry descriptor denoted by argument die does not contain the requested attribute, these functions return DW_DLV_NO_ENTRY and set argument err. For other errors, they return DW_DLV_ERROR and set argument err. ERRORS
These functions can fail with the following errors: [DW_DLE_ARGUMENT] Arguments die, ret_highpc, ret_lowpc, ret_size, ret_lang or ret_order were NULL. [DW_DLE_NO_ENTRY] Argument die had no requested attribute. SEE ALSO
dwarf(3), dwarf_attr(3), dwarf_attrlist(3), dwarf_hasattr(3), dwarf_get_form_class(3) BSD
July 22, 2014 BSD
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