Revert vendor directory to support old golang (GOPATH mode)

gomodule is still in progress to migrate for now, hence multus
team decide to keep vendor directory to support build without
gomodule.

vendor/github.com/modern-go/reflect2/unsafe_slice.go

@@ -0,0 +1,177 @@
+package reflect2
+
+import (
+	"reflect"
+	"unsafe"
+)
+
+// sliceHeader is a safe version of SliceHeader used within this package.
+type sliceHeader struct {
+	Data unsafe.Pointer
+	Len  int
+	Cap  int
+}
+
+type UnsafeSliceType struct {
+	unsafeType
+	elemRType  unsafe.Pointer
+	pElemRType unsafe.Pointer
+	elemSize   uintptr
+}
+
+func newUnsafeSliceType(cfg *frozenConfig, type1 reflect.Type) SliceType {
+	elemType := type1.Elem()
+	return &UnsafeSliceType{
+		unsafeType: *newUnsafeType(cfg, type1),
+		pElemRType: unpackEFace(reflect.PtrTo(elemType)).data,
+		elemRType:  unpackEFace(elemType).data,
+		elemSize:   elemType.Size(),
+	}
+}
+
+func (type2 *UnsafeSliceType) Set(obj interface{}, val interface{}) {
+	objEFace := unpackEFace(obj)
+	assertType("Type.Set argument 1", type2.ptrRType, objEFace.rtype)
+	valEFace := unpackEFace(val)
+	assertType("Type.Set argument 2", type2.ptrRType, valEFace.rtype)
+	type2.UnsafeSet(objEFace.data, valEFace.data)
+}
+
+func (type2 *UnsafeSliceType) UnsafeSet(ptr unsafe.Pointer, val unsafe.Pointer) {
+	*(*sliceHeader)(ptr) = *(*sliceHeader)(val)
+}
+
+func (type2 *UnsafeSliceType) IsNil(obj interface{}) bool {
+	if obj == nil {
+		return true
+	}
+	objEFace := unpackEFace(obj)
+	assertType("Type.IsNil argument 1", type2.ptrRType, objEFace.rtype)
+	return type2.UnsafeIsNil(objEFace.data)
+}
+
+func (type2 *UnsafeSliceType) UnsafeIsNil(ptr unsafe.Pointer) bool {
+	if ptr == nil {
+		return true
+	}
+	return (*sliceHeader)(ptr).Data == nil
+}
+
+func (type2 *UnsafeSliceType) SetNil(obj interface{}) {
+	objEFace := unpackEFace(obj)
+	assertType("SliceType.SetNil argument 1", type2.ptrRType, objEFace.rtype)
+	type2.UnsafeSetNil(objEFace.data)
+}
+
+func (type2 *UnsafeSliceType) UnsafeSetNil(ptr unsafe.Pointer) {
+	header := (*sliceHeader)(ptr)
+	header.Len = 0
+	header.Cap = 0
+	header.Data = nil
+}
+
+func (type2 *UnsafeSliceType) MakeSlice(length int, cap int) interface{} {
+	return packEFace(type2.ptrRType, type2.UnsafeMakeSlice(length, cap))
+}
+
+func (type2 *UnsafeSliceType) UnsafeMakeSlice(length int, cap int) unsafe.Pointer {
+	header := &sliceHeader{unsafe_NewArray(type2.elemRType, cap), length, cap}
+	return unsafe.Pointer(header)
+}
+
+func (type2 *UnsafeSliceType) LengthOf(obj interface{}) int {
+	objEFace := unpackEFace(obj)
+	assertType("SliceType.Len argument 1", type2.ptrRType, objEFace.rtype)
+	return type2.UnsafeLengthOf(objEFace.data)
+}
+
+func (type2 *UnsafeSliceType) UnsafeLengthOf(obj unsafe.Pointer) int {
+	header := (*sliceHeader)(obj)
+	return header.Len
+}
+
+func (type2 *UnsafeSliceType) SetIndex(obj interface{}, index int, elem interface{}) {
+	objEFace := unpackEFace(obj)
+	assertType("SliceType.SetIndex argument 1", type2.ptrRType, objEFace.rtype)
+	elemEFace := unpackEFace(elem)
+	assertType("SliceType.SetIndex argument 3", type2.pElemRType, elemEFace.rtype)
+	type2.UnsafeSetIndex(objEFace.data, index, elemEFace.data)
+}
+
+func (type2 *UnsafeSliceType) UnsafeSetIndex(obj unsafe.Pointer, index int, elem unsafe.Pointer) {
+	header := (*sliceHeader)(obj)
+	elemPtr := arrayAt(header.Data, index, type2.elemSize, "i < s.Len")
+	typedmemmove(type2.elemRType, elemPtr, elem)
+}
+
+func (type2 *UnsafeSliceType) GetIndex(obj interface{}, index int) interface{} {
+	objEFace := unpackEFace(obj)
+	assertType("SliceType.GetIndex argument 1", type2.ptrRType, objEFace.rtype)
+	elemPtr := type2.UnsafeGetIndex(objEFace.data, index)
+	return packEFace(type2.pElemRType, elemPtr)
+}
+
+func (type2 *UnsafeSliceType) UnsafeGetIndex(obj unsafe.Pointer, index int) unsafe.Pointer {
+	header := (*sliceHeader)(obj)
+	return arrayAt(header.Data, index, type2.elemSize, "i < s.Len")
+}
+
+func (type2 *UnsafeSliceType) Append(obj interface{}, elem interface{}) {
+	objEFace := unpackEFace(obj)
+	assertType("SliceType.Append argument 1", type2.ptrRType, objEFace.rtype)
+	elemEFace := unpackEFace(elem)
+	assertType("SliceType.Append argument 2", type2.pElemRType, elemEFace.rtype)
+	type2.UnsafeAppend(objEFace.data, elemEFace.data)
+}
+
+func (type2 *UnsafeSliceType) UnsafeAppend(obj unsafe.Pointer, elem unsafe.Pointer) {
+	header := (*sliceHeader)(obj)
+	oldLen := header.Len
+	type2.UnsafeGrow(obj, oldLen+1)
+	type2.UnsafeSetIndex(obj, oldLen, elem)
+}
+
+func (type2 *UnsafeSliceType) Cap(obj interface{}) int {
+	objEFace := unpackEFace(obj)
+	assertType("SliceType.Cap argument 1", type2.ptrRType, objEFace.rtype)
+	return type2.UnsafeCap(objEFace.data)
+}
+
+func (type2 *UnsafeSliceType) UnsafeCap(ptr unsafe.Pointer) int {
+	return (*sliceHeader)(ptr).Cap
+}
+
+func (type2 *UnsafeSliceType) Grow(obj interface{}, newLength int) {
+	objEFace := unpackEFace(obj)
+	assertType("SliceType.Grow argument 1", type2.ptrRType, objEFace.rtype)
+	type2.UnsafeGrow(objEFace.data, newLength)
+}
+
+func (type2 *UnsafeSliceType) UnsafeGrow(obj unsafe.Pointer, newLength int) {
+	header := (*sliceHeader)(obj)
+	if newLength <= header.Cap {
+		header.Len = newLength
+		return
+	}
+	newCap := calcNewCap(header.Cap, newLength)
+	newHeader := (*sliceHeader)(type2.UnsafeMakeSlice(header.Len, newCap))
+	typedslicecopy(type2.elemRType, *newHeader, *header)
+	header.Data = newHeader.Data
+	header.Cap = newHeader.Cap
+	header.Len = newLength
+}
+
+func calcNewCap(cap int, expectedCap int) int {
+	if cap == 0 {
+		cap = expectedCap
+	} else {
+		for cap < expectedCap {
+			if cap < 1024 {
+				cap += cap
+			} else {
+				cap += cap / 4
+			}
+		}
+	}
+	return cap
+}