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@ -26,6 +26,7 @@ import (
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"encoding/hex"
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"fmt"
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"hash"
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"log"
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"math"
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"reflect"
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"sync"
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@ -142,6 +143,35 @@ func Hash(v any) (s Sum) {
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return h.sum()
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}
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// HasherForType is like Hash, but it returns a Hash func that's specialized for
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// the provided reflect type, avoiding a map lookup per value.
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func HasherForType[T any]() func(T) Sum {
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var zeroT T
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ti := getTypeInfo(reflect.TypeOf(zeroT))
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seedOnce.Do(initSeed)
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return func(v T) Sum {
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h := hasherPool.Get().(*hasher)
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defer hasherPool.Put(h)
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h.reset()
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h.hashUint64(seed)
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rv := reflect.ValueOf(v)
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if rv.IsValid() {
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// Always treat the Hash input as an interface (it is), including hashing
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// its type, otherwise two Hash calls of different types could hash to the
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// same bytes off the different types and get equivalent Sum values. This is
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// the same thing that we do for reflect.Kind Interface in hashValue, but
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// the initial reflect.ValueOf from an interface value effectively strips
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// the interface box off so we have to do it at the top level by hand.
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h.hashType(rv.Type())
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h.hashValueWithType(rv, ti, false)
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}
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return h.sum()
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}
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}
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// Update sets last to the hash of v and reports whether its value changed.
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func Update(last *Sum, v ...any) (changed bool) {
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sum := Hash(v)
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@ -170,14 +200,26 @@ func (h *hasher) hashUint32(i uint32) {
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binary.LittleEndian.PutUint32(h.scratch[:4], i)
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h.bw.Write(h.scratch[:4])
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}
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func (h *hasher) hashLen(n int) {
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binary.LittleEndian.PutUint64(h.scratch[:8], uint64(n))
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h.bw.Write(h.scratch[:8])
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}
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func (h *hasher) hashUint64(i uint64) {
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binary.LittleEndian.PutUint64(h.scratch[:8], i)
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h.bw.Write(h.scratch[:8])
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}
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var uint8Type = reflect.TypeOf(byte(0))
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var (
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uint8Type = reflect.TypeOf(byte(0))
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timeTimeType = reflect.TypeOf(time.Time{})
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)
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// typeInfo describes properties of a type.
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//
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// A non-nil typeInfo is populated into the typeHasher map
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// when its type is first requested, before its func is created.
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// Its func field fn is only populated once the type has been created.
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// This is used for recursive types.
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type typeInfo struct {
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rtype reflect.Type
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canMemHash bool
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@ -190,11 +232,394 @@ type typeInfo struct {
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// keyTypeInfo is the map key type's typeInfo.
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// It's set when rtype is of Kind Map.
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keyTypeInfo *typeInfo
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hashFuncOnce sync.Once
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hashFuncLazy typeHasherFunc // nil until created
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}
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// returns ok if it was handled; else slow path runs
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type typeHasherFunc func(h *hasher, v reflect.Value) (ok bool)
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var typeInfoMap sync.Map // map[reflect.Type]*typeInfo
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var typeInfoMapPopulate sync.Mutex // just for adding to typeInfoMap
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func (ti *typeInfo) hasher() typeHasherFunc {
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ti.hashFuncOnce.Do(ti.buildHashFuncOnce)
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return ti.hashFuncLazy
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}
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func (ti *typeInfo) buildHashFuncOnce() {
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ti.hashFuncLazy = genTypeHasher(ti.rtype)
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}
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func (h *hasher) hashBoolv(v reflect.Value) bool {
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var b byte
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if v.Bool() {
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b = 1
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}
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h.hashUint8(b)
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return true
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}
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func (h *hasher) hashUint8v(v reflect.Value) bool {
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h.hashUint8(uint8(v.Uint()))
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return true
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}
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func (h *hasher) hashInt8v(v reflect.Value) bool {
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h.hashUint8(uint8(v.Int()))
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return true
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}
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func (h *hasher) hashUint16v(v reflect.Value) bool {
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h.hashUint16(uint16(v.Uint()))
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return true
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}
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func (h *hasher) hashInt16v(v reflect.Value) bool {
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h.hashUint16(uint16(v.Int()))
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return true
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}
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func (h *hasher) hashUint32v(v reflect.Value) bool {
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h.hashUint32(uint32(v.Uint()))
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return true
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}
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func (h *hasher) hashInt32v(v reflect.Value) bool {
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h.hashUint32(uint32(v.Int()))
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return true
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}
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func (h *hasher) hashUint64v(v reflect.Value) bool {
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h.hashUint64(v.Uint())
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return true
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}
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func (h *hasher) hashInt64v(v reflect.Value) bool {
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h.hashUint64(uint64(v.Int()))
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return true
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}
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func hashStructAppenderTo(h *hasher, v reflect.Value) bool {
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if !v.CanInterface() {
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return false // slow path
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}
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var a appenderTo
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if v.CanAddr() {
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a = v.Addr().Interface().(appenderTo)
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} else {
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a = v.Interface().(appenderTo)
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}
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size := h.scratch[:8]
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record := a.AppendTo(size)
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binary.LittleEndian.PutUint64(record, uint64(len(record)-len(size)))
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h.bw.Write(record)
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return true
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}
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// hashPointerAppenderTo hashes v, a reflect.Ptr, that implements appenderTo.
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func hashPointerAppenderTo(h *hasher, v reflect.Value) bool {
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if !v.CanInterface() {
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return false // slow path
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}
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if v.IsNil() {
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h.hashUint8(0) // indicates nil
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return true
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}
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h.hashUint8(1) // indicates visiting a pointer
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a := v.Interface().(appenderTo)
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size := h.scratch[:8]
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record := a.AppendTo(size)
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binary.LittleEndian.PutUint64(record, uint64(len(record)-len(size)))
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h.bw.Write(record)
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return true
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}
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// fieldInfo describes a struct field.
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type fieldInfo struct {
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index int // index of field for reflect.Value.Field(n)
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typeInfo *typeInfo
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canMemHash bool
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offset uintptr // when we can memhash the field
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size uintptr // when we can memhash the field
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}
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// mergeContiguousFieldsCopy returns a copy of f with contiguous memhashable fields
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// merged together. Such fields get a bogus index and fu value.
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func mergeContiguousFieldsCopy(in []fieldInfo) []fieldInfo {
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ret := make([]fieldInfo, 0, len(in))
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var last *fieldInfo
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for _, f := range in {
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// Combine two fields if they're both contiguous & memhash-able.
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if f.canMemHash && last != nil && last.canMemHash && last.offset+last.size == f.offset {
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last.size += f.size
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last.index = -1
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last.typeInfo = nil
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} else {
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ret = append(ret, f)
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last = &ret[len(ret)-1]
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}
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}
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return ret
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}
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// genHashStructFields generates a typeHasherFunc for t, which must be of kind Struct.
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func genHashStructFields(t reflect.Type) typeHasherFunc {
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fields := make([]fieldInfo, 0, t.NumField())
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for i, n := 0, t.NumField(); i < n; i++ {
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sf := t.Field(i)
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if sf.Type.Size() == 0 {
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continue
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}
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fields = append(fields, fieldInfo{
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index: i,
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typeInfo: getTypeInfo(sf.Type),
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canMemHash: canMemHash(sf.Type),
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offset: sf.Offset,
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size: sf.Type.Size(),
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})
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}
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fieldsIfCanAddr := mergeContiguousFieldsCopy(fields)
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return structHasher{fields, fieldsIfCanAddr}.hash
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}
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type structHasher struct {
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fields, fieldsIfCanAddr []fieldInfo
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}
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func (sh structHasher) hash(h *hasher, v reflect.Value) bool {
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var base unsafe.Pointer
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if v.CanAddr() {
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base = v.Addr().UnsafePointer()
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for _, f := range sh.fieldsIfCanAddr {
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if f.canMemHash {
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h.bw.Write(unsafe.Slice((*byte)(unsafe.Pointer(uintptr(base)+f.offset)), f.size))
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} else if !f.typeInfo.hasher()(h, v.Field(f.index)) {
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return false
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}
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}
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} else {
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for _, f := range sh.fields {
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if !f.typeInfo.hasher()(h, v.Field(f.index)) {
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return false
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}
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}
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}
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return true
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}
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// genHashPtrToMemoryRange returns a hasher where the reflect.Value is a Ptr to
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// the provided eleType.
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func genHashPtrToMemoryRange(eleType reflect.Type) typeHasherFunc {
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size := eleType.Size()
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return func(h *hasher, v reflect.Value) bool {
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if v.IsNil() {
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h.hashUint8(0) // indicates nil
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} else {
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h.hashUint8(1) // indicates visiting a pointer
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h.bw.Write(unsafe.Slice((*byte)(v.UnsafePointer()), size))
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}
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return true
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}
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}
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const debug = false
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func genTypeHasher(t reflect.Type) typeHasherFunc {
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if debug {
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log.Printf("generating func for %v", t)
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}
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switch t.Kind() {
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case reflect.Bool:
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return (*hasher).hashBoolv
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case reflect.Int8:
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return (*hasher).hashInt8v
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case reflect.Int16:
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return (*hasher).hashInt16v
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case reflect.Int32:
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return (*hasher).hashInt32v
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case reflect.Int, reflect.Int64:
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return (*hasher).hashInt64v
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case reflect.Uint8:
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return (*hasher).hashUint8v
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case reflect.Uint16:
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return (*hasher).hashUint16v
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case reflect.Uint32:
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return (*hasher).hashUint32v
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case reflect.Uint, reflect.Uintptr, reflect.Uint64:
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return (*hasher).hashUint64v
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case reflect.Float32:
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return (*hasher).hashFloat32v
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case reflect.Float64:
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return (*hasher).hashFloat64v
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case reflect.Complex64:
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return (*hasher).hashComplex64v
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case reflect.Complex128:
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return (*hasher).hashComplex128v
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case reflect.String:
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return (*hasher).hashString
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case reflect.Slice:
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et := t.Elem()
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if canMemHash(et) {
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return (*hasher).hashSliceMem
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}
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eti := getTypeInfo(et)
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return genHashSliceElements(eti)
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case reflect.Array:
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et := t.Elem()
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eti := getTypeInfo(et)
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return genHashArray(t, eti)
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case reflect.Struct:
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if t == timeTimeType {
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return (*hasher).hashTimev
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}
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if t.Implements(appenderToType) {
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return hashStructAppenderTo
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}
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return genHashStructFields(t)
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case reflect.Pointer:
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et := t.Elem()
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if canMemHash(et) {
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return genHashPtrToMemoryRange(et)
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}
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if t.Implements(appenderToType) {
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return hashPointerAppenderTo
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}
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if !typeIsRecursive(t) {
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eti := getTypeInfo(et)
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return func(h *hasher, v reflect.Value) bool {
|
|
|
|
|
if v.IsNil() {
|
|
|
|
|
h.hashUint8(0) // indicates nil
|
|
|
|
|
return true
|
|
|
|
|
}
|
|
|
|
|
h.hashUint8(1) // indicates visiting a pointer
|
|
|
|
|
return eti.hasher()(h, v.Elem())
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return func(h *hasher, v reflect.Value) bool {
|
|
|
|
|
if debug {
|
|
|
|
|
log.Printf("unhandled type %v", v.Type())
|
|
|
|
|
}
|
|
|
|
|
return false
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// hashString hashes v, of kind String.
|
|
|
|
|
func (h *hasher) hashString(v reflect.Value) bool {
|
|
|
|
|
s := v.String()
|
|
|
|
|
h.hashLen(len(s))
|
|
|
|
|
h.bw.WriteString(s)
|
|
|
|
|
return true
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (h *hasher) hashFloat32v(v reflect.Value) bool {
|
|
|
|
|
h.hashUint32(math.Float32bits(float32(v.Float())))
|
|
|
|
|
return true
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (h *hasher) hashFloat64v(v reflect.Value) bool {
|
|
|
|
|
h.hashUint64(math.Float64bits(v.Float()))
|
|
|
|
|
return true
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (h *hasher) hashComplex64v(v reflect.Value) bool {
|
|
|
|
|
c := complex64(v.Complex())
|
|
|
|
|
h.hashUint32(math.Float32bits(real(c)))
|
|
|
|
|
h.hashUint32(math.Float32bits(imag(c)))
|
|
|
|
|
return true
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (h *hasher) hashComplex128v(v reflect.Value) bool {
|
|
|
|
|
c := v.Complex()
|
|
|
|
|
h.hashUint64(math.Float64bits(real(c)))
|
|
|
|
|
h.hashUint64(math.Float64bits(imag(c)))
|
|
|
|
|
return true
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// hashString hashes v, of kind time.Time.
|
|
|
|
|
func (h *hasher) hashTimev(v reflect.Value) bool {
|
|
|
|
|
var t time.Time
|
|
|
|
|
if v.CanAddr() {
|
|
|
|
|
t = *(v.Addr().Interface().(*time.Time))
|
|
|
|
|
} else {
|
|
|
|
|
t = v.Interface().(time.Time)
|
|
|
|
|
}
|
|
|
|
|
b := t.AppendFormat(h.scratch[:1], time.RFC3339Nano)
|
|
|
|
|
b[0] = byte(len(b) - 1) // more than sufficient width; if not, good enough.
|
|
|
|
|
h.bw.Write(b)
|
|
|
|
|
return true
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// hashSliceMem hashes v, of kind Slice, with a memhash-able element type.
|
|
|
|
|
func (h *hasher) hashSliceMem(v reflect.Value) bool {
|
|
|
|
|
vLen := v.Len()
|
|
|
|
|
h.hashUint64(uint64(vLen))
|
|
|
|
|
if vLen == 0 {
|
|
|
|
|
return true
|
|
|
|
|
}
|
|
|
|
|
h.bw.Write(unsafe.Slice((*byte)(v.UnsafePointer()), v.Type().Elem().Size()*uintptr(vLen)))
|
|
|
|
|
return true
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func genHashArrayMem(n int, arraySize uintptr, efu *typeInfo) typeHasherFunc {
|
|
|
|
|
byElement := genHashArrayElements(n, efu)
|
|
|
|
|
return func(h *hasher, v reflect.Value) bool {
|
|
|
|
|
if v.CanAddr() {
|
|
|
|
|
h.bw.Write(unsafe.Slice((*byte)(v.Addr().UnsafePointer()), arraySize))
|
|
|
|
|
return true
|
|
|
|
|
}
|
|
|
|
|
return byElement(h, v)
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func genHashArrayElements(n int, eti *typeInfo) typeHasherFunc {
|
|
|
|
|
return func(h *hasher, v reflect.Value) bool {
|
|
|
|
|
for i := 0; i < n; i++ {
|
|
|
|
|
if !eti.hasher()(h, v.Index(i)) {
|
|
|
|
|
return false
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
return true
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func noopHasherFunc(h *hasher, v reflect.Value) bool { return true }
|
|
|
|
|
|
|
|
|
|
func genHashArray(t reflect.Type, eti *typeInfo) typeHasherFunc {
|
|
|
|
|
if t.Size() == 0 {
|
|
|
|
|
return noopHasherFunc
|
|
|
|
|
}
|
|
|
|
|
et := t.Elem()
|
|
|
|
|
if canMemHash(et) {
|
|
|
|
|
return genHashArrayMem(t.Len(), t.Size(), eti)
|
|
|
|
|
}
|
|
|
|
|
n := t.Len()
|
|
|
|
|
return genHashArrayElements(n, eti)
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func genHashSliceElements(eti *typeInfo) typeHasherFunc {
|
|
|
|
|
return sliceElementHasher{eti}.hash
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
type sliceElementHasher struct {
|
|
|
|
|
eti *typeInfo
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func (seh sliceElementHasher) hash(h *hasher, v reflect.Value) bool {
|
|
|
|
|
vLen := v.Len()
|
|
|
|
|
h.hashUint64(uint64(vLen))
|
|
|
|
|
for i := 0; i < vLen; i++ {
|
|
|
|
|
if !seh.eti.hasher()(h, v.Index(i)) {
|
|
|
|
|
return false
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
return true
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
func getTypeInfo(t reflect.Type) *typeInfo {
|
|
|
|
|
if f, ok := typeInfoMap.Load(t); ok {
|
|
|
|
|
return f.(*typeInfo)
|
|
|
|
@ -353,6 +778,13 @@ func (h *hasher) hashValueWithType(v reflect.Value, ti *typeInfo, forceCycleChec
|
|
|
|
|
w := h.bw
|
|
|
|
|
doCheckCycles := forceCycleChecking || ti.isRecursive
|
|
|
|
|
|
|
|
|
|
if !doCheckCycles {
|
|
|
|
|
hf := ti.hasher()
|
|
|
|
|
if hf(h, v) {
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Generic handling.
|
|
|
|
|
switch v.Kind() {
|
|
|
|
|
default:
|
|
|
|
|