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Package cha
Package cha computes the call graph of a Go program using the Class
Hierarchy Analysis (CHA) algorithm.
CHA was first described in "Optimization of Object-Oriented Programs
Using Static Class Hierarchy Analysis", Jeffrey Dean, David Grove,
and Craig Chambers, ECOOP'95.
CHA is related to RTA (see go/callgraph/rta); the difference is that
CHA conservatively computes the entire "implements" relation between
interfaces and concrete types ahead of time, whereas RTA uses dynamic
programming to construct it on the fly as it encounters new functions
reachable from main. CHA may thus include spurious call edges for
types that haven't been instantiated yet, or types that are never
instantiated.
Since CHA conservatively assumes that all functions are address-taken
and all concrete types are put into interfaces, it is sound to run on
partial programs, such as libraries without a main or test function.
func CallGraph(prog *ssa.Program) *callgraph.Graph
CallGraph computes the call graph of the specified program using the
Class Hierarchy Analysis algorithm.