Golang Type.Variadic方法代码示例

func equalType(x, y types.Type) error {
	if reflect.TypeOf(x) != reflect.TypeOf(y) {
		return fmt.Errorf("unequal kinds: %T vs %T", x, y)
	}
	switch x := x.(type) {
	case *types.Interface:
		y := y.(*types.Interface)
		// TODO(gri): enable separate emission of Embedded interfaces
		// and ExplicitMethods then use this logic.
		// if x.NumEmbeddeds() != y.NumEmbeddeds() {
		// 	return fmt.Errorf("unequal number of embedded interfaces: %d vs %d",
		// 		x.NumEmbeddeds(), y.NumEmbeddeds())
		// }
		// for i := 0; i < x.NumEmbeddeds(); i++ {
		// 	xi := x.Embedded(i)
		// 	yi := y.Embedded(i)
		// 	if xi.String() != yi.String() {
		// 		return fmt.Errorf("mismatched %th embedded interface: %s vs %s",
		// 			i, xi, yi)
		// 	}
		// }
		// if x.NumExplicitMethods() != y.NumExplicitMethods() {
		// 	return fmt.Errorf("unequal methods: %d vs %d",
		// 		x.NumExplicitMethods(), y.NumExplicitMethods())
		// }
		// for i := 0; i < x.NumExplicitMethods(); i++ {
		// 	xm := x.ExplicitMethod(i)
		// 	ym := y.ExplicitMethod(i)
		// 	if xm.Name() != ym.Name() {
		// 		return fmt.Errorf("mismatched %th method: %s vs %s", i, xm, ym)
		// 	}
		// 	if err := equalType(xm.Type(), ym.Type()); err != nil {
		// 		return fmt.Errorf("mismatched %s method: %s", xm.Name(), err)
		// 	}
		// }
		if x.NumMethods() != y.NumMethods() {
			return fmt.Errorf("unequal methods: %d vs %d",
				x.NumMethods(), y.NumMethods())
		}
		for i := 0; i < x.NumMethods(); i++ {
			xm := x.Method(i)
			ym := y.Method(i)
			if xm.Name() != ym.Name() {
				return fmt.Errorf("mismatched %dth method: %s vs %s", i, xm, ym)
			}
			if err := equalType(xm.Type(), ym.Type()); err != nil {
				return fmt.Errorf("mismatched %s method: %s", xm.Name(), err)
			}
		}
	case *types.Array:
		y := y.(*types.Array)
		if x.Len() != y.Len() {
			return fmt.Errorf("unequal array lengths: %d vs %d", x.Len(), y.Len())
		}
		if err := equalType(x.Elem(), y.Elem()); err != nil {
			return fmt.Errorf("array elements: %s", err)
		}
	case *types.Basic:
		y := y.(*types.Basic)
		if x.Kind() != y.Kind() {
			return fmt.Errorf("unequal basic types: %s vs %s", x, y)
		}
	case *types.Chan:
		y := y.(*types.Chan)
		if x.Dir() != y.Dir() {
			return fmt.Errorf("unequal channel directions: %d vs %d", x.Dir(), y.Dir())
		}
		if err := equalType(x.Elem(), y.Elem()); err != nil {
			return fmt.Errorf("channel elements: %s", err)
		}
	case *types.Map:
		y := y.(*types.Map)
		if err := equalType(x.Key(), y.Key()); err != nil {
			return fmt.Errorf("map keys: %s", err)
		}
		if err := equalType(x.Elem(), y.Elem()); err != nil {
			return fmt.Errorf("map values: %s", err)
		}
	case *types.Named:
		y := y.(*types.Named)
		if x.String() != y.String() {
			return fmt.Errorf("unequal named types: %s vs %s", x, y)
		}
	case *types.Pointer:
		y := y.(*types.Pointer)
		if err := equalType(x.Elem(), y.Elem()); err != nil {
			return fmt.Errorf("pointer elements: %s", err)
		}
	case *types.Signature:
		y := y.(*types.Signature)
		if err := equalType(x.Params(), y.Params()); err != nil {
			return fmt.Errorf("parameters: %s", err)
		}
		if err := equalType(x.Results(), y.Results()); err != nil {
			return fmt.Errorf("results: %s", err)
		}
		if x.Variadic() != y.Variadic() {
			return fmt.Errorf("unequal varidicity: %t vs %t",
				x.Variadic(), y.Variadic())
		}
//.........这里部分代码省略.........

func (p *exporter) typ(t types.Type) {
	if t == nil {
		log.Fatalf("gcimporter: nil type")
	}

	// Possible optimization: Anonymous pointer types *T where
	// T is a named type are common. We could canonicalize all
	// such types *T to a single type PT = *T. This would lead
	// to at most one *T entry in typIndex, and all future *T's
	// would be encoded as the respective index directly. Would
	// save 1 byte (pointerTag) per *T and reduce the typIndex
	// size (at the cost of a canonicalization map). We can do
	// this later, without encoding format change.

	// if we saw the type before, write its index (>= 0)
	if i, ok := p.typIndex[t]; ok {
		p.index('T', i)
		return
	}

	// otherwise, remember the type, write the type tag (< 0) and type data
	if trackAllTypes {
		if trace {
			p.tracef("T%d = {>\n", len(p.typIndex))
			defer p.tracef("<\n} ")
		}
		p.typIndex[t] = len(p.typIndex)
	}

	switch t := t.(type) {
	case *types.Named:
		if !trackAllTypes {
			// if we don't track all types, track named types now
			p.typIndex[t] = len(p.typIndex)
		}

		p.tag(namedTag)
		p.pos(t.Obj())
		p.qualifiedName(t.Obj())
		p.typ(t.Underlying())
		if !types.IsInterface(t) {
			p.assocMethods(t)
		}

	case *types.Array:
		p.tag(arrayTag)
		p.int64(t.Len())
		p.typ(t.Elem())

	case *types.Slice:
		p.tag(sliceTag)
		p.typ(t.Elem())

	case *dddSlice:
		p.tag(dddTag)
		p.typ(t.elem)

	case *types.Struct:
		p.tag(structTag)
		p.fieldList(t)

	case *types.Pointer:
		p.tag(pointerTag)
		p.typ(t.Elem())

	case *types.Signature:
		p.tag(signatureTag)
		p.paramList(t.Params(), t.Variadic())
		p.paramList(t.Results(), false)

	case *types.Interface:
		p.tag(interfaceTag)
		p.iface(t)

	case *types.Map:
		p.tag(mapTag)
		p.typ(t.Key())
		p.typ(t.Elem())

	case *types.Chan:
		p.tag(chanTag)
		p.int(int(3 - t.Dir())) // hack
		p.typ(t.Elem())

	default:
		log.Fatalf("gcimporter: unexpected type %T: %s", t, t)
	}
}

// hashFor computes the hash of t.
func (h Hasher) hashFor(t types.Type) uint32 {
	// See Identical for rationale.
	switch t := t.(type) {
	case *types.Basic:
		return uint32(t.Kind())

	case *types.Array:
		return 9043 + 2*uint32(t.Len()) + 3*h.Hash(t.Elem())

	case *types.Slice:
		return 9049 + 2*h.Hash(t.Elem())

	case *types.Struct:
		var hash uint32 = 9059
		for i, n := 0, t.NumFields(); i < n; i++ {
			f := t.Field(i)
			if f.Anonymous() {
				hash += 8861
			}
			hash += hashString(t.Tag(i))
			hash += hashString(f.Name()) // (ignore f.Pkg)
			hash += h.Hash(f.Type())
		}
		return hash

	case *types.Pointer:
		return 9067 + 2*h.Hash(t.Elem())

	case *types.Signature:
		var hash uint32 = 9091
		if t.Variadic() {
			hash *= 8863
		}
		return hash + 3*h.hashTuple(t.Params()) + 5*h.hashTuple(t.Results())

	case *types.Interface:
		var hash uint32 = 9103
		for i, n := 0, t.NumMethods(); i < n; i++ {
			// See go/types.identicalMethods for rationale.
			// Method order is not significant.
			// Ignore m.Pkg().
			m := t.Method(i)
			hash += 3*hashString(m.Name()) + 5*h.Hash(m.Type())
		}
		return hash

	case *types.Map:
		return 9109 + 2*h.Hash(t.Key()) + 3*h.Hash(t.Elem())

	case *types.Chan:
		return 9127 + 2*uint32(t.Dir()) + 3*h.Hash(t.Elem())

	case *types.Named:
		// Not safe with a copying GC; objects may move.
		return uint32(reflect.ValueOf(t.Obj()).Pointer())

	case *types.Tuple:
		return h.hashTuple(t)
	}
	panic(t)
}