go/src/cmd/compile/internal/coverage/cover.go

type names …

// Fixup adds calls to the pkg init function as appropriate to
// register coverage-related variables with the runtime.
//
// It also reclassifies selected variables (for example, tagging
// coverage counter variables with flags so that they can be handled
// properly downstream).
func Fixup() { … }

func metaHashAndLen() ([16]byte, int) { … }

func registerMeta(cnames names, hashv [16]byte, mdlen int) { … }

// addInitHookCall generates a call to runtime/coverage.initHook() and
// inserts it into the package main init function, which will kick off
// the process for coverage data writing (emit meta data, and register
// an exit hook to emit counter data).
func addInitHookCall(initfn *ir.Func, cmode coverage.CounterMode) { … }