Caller returns the Program Counter (PC) of the caller.

CallerStackTrace returns the StackTrace of the current Caller (in current goroutine).

DefaultCallerPCFilter is an overridable function used to get the default PCFilter, used by function PC, if one was not provided.

Frames is a slice of runtime.Frame.

PC is just a handy wrapper around Program Counter (PC) [see "program counter" in https://pkg.go.dev/runtime].

PCFilter is a function which returns false if a Program Counter (PC) is not a caller.

PCs is a goroutine execution frames stack trace.