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$Id: dwarf_formexprloc.3 3640 2018-10-14 14:09:13Z jkoshy $
.Dd July 25, 2010 .Dt DWARF_FORMEXPRLOC 3 .Os .Sh NAME .Nm dwarf_formexprloc .Nd return information about a location expression .Sh LIBRARY .Lb libdwarf .Sh SYNOPSIS n libdwarf.h .Ft int .Fo dwarf_formexprloc .Fa "Dwarf_Attribute attr" .Fa "Dwarf_Unsigned *retlen" .Fa "Dwarf_Ptr *retexpr" .Fa "Dwarf_Error *err" .Fc .Sh DESCRIPTION Function .Fn dwarf_formexprloc allows an application to retrieve the length and the bytes of a DWARF location expression.
p Argument .Ar attr should reference a DWARF attribute of the form .Dv DW_FORM_exprloc . Argument .Ar retlen should point to a location that will be set to the length of the location expression. Argument .Ar retexpr should point to a location that will be set to a pointer to the content of the location expression itself.
p If argument .Ar err is not NULL, it will be used to return an error descriptor in case of an error. .Ss Memory Management The application should not attempt to free the memory area referenced by the pointer returned in argument .Ar retexpr . .Sh RETURN VALUES Function .Fn dwarf_formexprloc returns .Dv DW_DLV_OK on success. In case of an error, it returns .Dv DW_DLV_ERROR and sets argument .Ar err . .Sh ERRORS Function .Fn dwarf_formexprloc may fail with the following errors: l -tag -width ".Bq Er DW_DLE_ATTR_FORM_BAD" t Bq Er DW_DLE_ARGUMENT One of arguments .Ar attr , .Ar retlen or .Ar retexpr was NULL. t Bq Er DW_DLE_ATTR_FORM_BAD The attribute referenced by argument .Ar attr was not of form .Dv DW_FORM_exprloc . .El .Sh SEE ALSO .Xr dwarf 3 , .Xr dwarf_attr 3 , .Xr dwarf_formblock 3 , .Xr dwarf_formflag 3 , .Xr dwarf_formref 3 , .Xr dwarf_formsdata 3 , .Xr dwarf_formsig8 3 , .Xr dwarf_formstring 3 , .Xr dwarf_formudata 3 , .Xr dwarf_hasattr 3