// hashed symbols.
func (w *writer) contentHash(s *LSym) goobj.HashType {
h := sha1.New()
+ var tmp [14]byte
+
+ // Include the size of the symbol in the hash.
+ // This preserves the length of symbols, preventing the following two symbols
+ // from hashing the same:
+ //
+ // [2]int{1,2} ≠ [10]int{1,2,0,0,0...}
+ //
+ // In this case, if the smaller symbol is alive, the larger is not kept unless
+ // needed.
+ binary.LittleEndian.PutUint64(tmp[:8], uint64(s.Size))
+ h.Write(tmp[:8])
+
+ // Don't dedup type symbols with others, as they are in a different
+ // section.
+ if strings.HasPrefix(s.Name, "type.") {
+ h.Write([]byte{'T'})
+ } else {
+ h.Write([]byte{0})
+ }
// The compiler trims trailing zeros _sometimes_. We just do
// it always.
h.Write(bytes.TrimRight(s.P, "\x00"))