go/src/internal/abi/funcpc.go

// FuncPCABI0 returns the entry PC of the function f, which must be a
// direct reference of a function defined as ABI0. Otherwise it is a
// compile-time error.
//
// Implemented as a compile intrinsic.
func FuncPCABI0(f interface{ … }

// FuncPCABIInternal returns the entry PC of the function f. If f is a
// direct reference of a function, it must be defined as ABIInternal.
// Otherwise it is a compile-time error. If f is not a direct reference
// of a defined function, it assumes that f is a func value. Otherwise
// the behavior is undefined.
//
// Implemented as a compile intrinsic.
func FuncPCABIInternal(f interface{ … }