:- use_module(library(prolog_xref)).(can be autoloaded)
- xref_called(?Source, ?Called, ?By) is nondet
- xref_called(?Source, ?Called, ?By, ?Cond) is nondet
- xref_called(?Source, ?Called, ?By, ?Cond, ?Line) is nondet
- True when By is called from Called in Source. Note that
xref_called/3 and xref_called/4 use distinct/2 to return only
Called-By pairs. The xref_called/5 version may return
Called-By if Called is called from multiple clauses in
By, but at most one call per clause.
|By||- is a head term or one of the reserved terms
'<public>'(Line), indicating the call
is from an (often initialization/1) directive or there is a public/1
directive that claims the predicate is called from in some
|Cond||- is the (accumulated) condition as defined by
:- if(Cond) under which the calling code is compiled.
|Line||- is the start line of the calling clause.|