go/src/cmd/internal/obj/line.go

// AddImport adds a package to the list of imported packages.
func (ctxt *Link) AddImport(pkg string, fingerprint goobj.FingerprintType) { … }

// getFileIndexAndLine returns the relative file index (local to the CU), and
// the relative line number for a position (i.e., as adjusted by a //line
// directive). This is the file/line visible in the final binary (pcfile, pcln,
// etc).
func (ctxt *Link) getFileIndexAndLine(xpos src.XPos) (int, int32) { … }