Adding upstream version 1.16.10.upstream/1.16.10upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2858 insertions, 0 deletions

diff --git a/src/reflect/value.go b/src/reflect/value.go
new file mode 100644
index 0000000..1f185b5
--- /dev/null
+++ b/src/reflect/value.go
@@ -0,0 +1,2858 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package reflect
+
+import (
+	"internal/unsafeheader"
+	"math"
+	"runtime"
+	"unsafe"
+)
+
+const ptrSize = 4 << (^uintptr(0) >> 63) // unsafe.Sizeof(uintptr(0)) but an ideal const
+
+// Value is the reflection interface to a Go value.
+//
+// Not all methods apply to all kinds of values. Restrictions,
+// if any, are noted in the documentation for each method.
+// Use the Kind method to find out the kind of value before
+// calling kind-specific methods. Calling a method
+// inappropriate to the kind of type causes a run time panic.
+//
+// The zero Value represents no value.
+// Its IsValid method returns false, its Kind method returns Invalid,
+// its String method returns "<invalid Value>", and all other methods panic.
+// Most functions and methods never return an invalid value.
+// If one does, its documentation states the conditions explicitly.
+//
+// A Value can be used concurrently by multiple goroutines provided that
+// the underlying Go value can be used concurrently for the equivalent
+// direct operations.
+//
+// To compare two Values, compare the results of the Interface method.
+// Using == on two Values does not compare the underlying values
+// they represent.
+type Value struct {
+	// typ holds the type of the value represented by a Value.
+	typ *rtype
+
+	// Pointer-valued data or, if flagIndir is set, pointer to data.
+	// Valid when either flagIndir is set or typ.pointers() is true.
+	ptr unsafe.Pointer
+
+	// flag holds metadata about the value.
+	// The lowest bits are flag bits:
+	//	- flagStickyRO: obtained via unexported not embedded field, so read-only
+	//	- flagEmbedRO: obtained via unexported embedded field, so read-only
+	//	- flagIndir: val holds a pointer to the data
+	//	- flagAddr: v.CanAddr is true (implies flagIndir)
+	//	- flagMethod: v is a method value.
+	// The next five bits give the Kind of the value.
+	// This repeats typ.Kind() except for method values.
+	// The remaining 23+ bits give a method number for method values.
+	// If flag.kind() != Func, code can assume that flagMethod is unset.
+	// If ifaceIndir(typ), code can assume that flagIndir is set.
+	flag
+
+	// A method value represents a curried method invocation
+	// like r.Read for some receiver r. The typ+val+flag bits describe
+	// the receiver r, but the flag's Kind bits say Func (methods are
+	// functions), and the top bits of the flag give the method number
+	// in r's type's method table.
+}
+
+type flag uintptr
+
+const (
+	flagKindWidth        = 5 // there are 27 kinds
+	flagKindMask    flag = 1<<flagKindWidth - 1
+	flagStickyRO    flag = 1 << 5
+	flagEmbedRO     flag = 1 << 6
+	flagIndir       flag = 1 << 7
+	flagAddr        flag = 1 << 8
+	flagMethod      flag = 1 << 9
+	flagMethodShift      = 10
+	flagRO          flag = flagStickyRO | flagEmbedRO
+)
+
+func (f flag) kind() Kind {
+	return Kind(f & flagKindMask)
+}
+
+func (f flag) ro() flag {
+	if f&flagRO != 0 {
+		return flagStickyRO
+	}
+	return 0
+}
+
+// pointer returns the underlying pointer represented by v.
+// v.Kind() must be Ptr, Map, Chan, Func, or UnsafePointer
+// if v.Kind() == Ptr, the base type must not be go:notinheap.
+func (v Value) pointer() unsafe.Pointer {
+	if v.typ.size != ptrSize || !v.typ.pointers() {
+		panic("can't call pointer on a non-pointer Value")
+	}
+	if v.flag&flagIndir != 0 {
+		return *(*unsafe.Pointer)(v.ptr)
+	}
+	return v.ptr
+}
+
+// packEface converts v to the empty interface.
+func packEface(v Value) interface{} {
+	t := v.typ
+	var i interface{}
+	e := (*emptyInterface)(unsafe.Pointer(&i))
+	// First, fill in the data portion of the interface.
+	switch {
+	case ifaceIndir(t):
+		if v.flag&flagIndir == 0 {
+			panic("bad indir")
+		}
+		// Value is indirect, and so is the interface we're making.
+		ptr := v.ptr
+		if v.flag&flagAddr != 0 {
+			// TODO: pass safe boolean from valueInterface so
+			// we don't need to copy if safe==true?
+			c := unsafe_New(t)
+			typedmemmove(t, c, ptr)
+			ptr = c
+		}
+		e.word = ptr
+	case v.flag&flagIndir != 0:
+		// Value is indirect, but interface is direct. We need
+		// to load the data at v.ptr into the interface data word.
+		e.word = *(*unsafe.Pointer)(v.ptr)
+	default:
+		// Value is direct, and so is the interface.
+		e.word = v.ptr
+	}
+	// Now, fill in the type portion. We're very careful here not
+	// to have any operation between the e.word and e.typ assignments
+	// that would let the garbage collector observe the partially-built
+	// interface value.
+	e.typ = t
+	return i
+}
+
+// unpackEface converts the empty interface i to a Value.
+func unpackEface(i interface{}) Value {
+	e := (*emptyInterface)(unsafe.Pointer(&i))
+	// NOTE: don't read e.word until we know whether it is really a pointer or not.
+	t := e.typ
+	if t == nil {
+		return Value{}
+	}
+	f := flag(t.Kind())
+	if ifaceIndir(t) {
+		f |= flagIndir
+	}
+	return Value{t, e.word, f}
+}
+
+// A ValueError occurs when a Value method is invoked on
+// a Value that does not support it. Such cases are documented
+// in the description of each method.
+type ValueError struct {
+	Method string
+	Kind   Kind
+}
+
+func (e *ValueError) Error() string {
+	if e.Kind == 0 {
+		return "reflect: call of " + e.Method + " on zero Value"
+	}
+	return "reflect: call of " + e.Method + " on " + e.Kind.String() + " Value"
+}
+
+// methodName returns the name of the calling method,
+// assumed to be two stack frames above.
+func methodName() string {
+	pc, _, _, _ := runtime.Caller(2)
+	f := runtime.FuncForPC(pc)
+	if f == nil {
+		return "unknown method"
+	}
+	return f.Name()
+}
+
+// methodNameSkip is like methodName, but skips another stack frame.
+// This is a separate function so that reflect.flag.mustBe will be inlined.
+func methodNameSkip() string {
+	pc, _, _, _ := runtime.Caller(3)
+	f := runtime.FuncForPC(pc)
+	if f == nil {
+		return "unknown method"
+	}
+	return f.Name()
+}
+
+// emptyInterface is the header for an interface{} value.
+type emptyInterface struct {
+	typ  *rtype
+	word unsafe.Pointer
+}
+
+// nonEmptyInterface is the header for an interface value with methods.
+type nonEmptyInterface struct {
+	// see ../runtime/iface.go:/Itab
+	itab *struct {
+		ityp *rtype // static interface type
+		typ  *rtype // dynamic concrete type
+		hash uint32 // copy of typ.hash
+		_    [4]byte
+		fun  [100000]unsafe.Pointer // method table
+	}
+	word unsafe.Pointer
+}
+
+// mustBe panics if f's kind is not expected.
+// Making this a method on flag instead of on Value
+// (and embedding flag in Value) means that we can write
+// the very clear v.mustBe(Bool) and have it compile into
+// v.flag.mustBe(Bool), which will only bother to copy the
+// single important word for the receiver.
+func (f flag) mustBe(expected Kind) {
+	// TODO(mvdan): use f.kind() again once mid-stack inlining gets better
+	if Kind(f&flagKindMask) != expected {
+		panic(&ValueError{methodName(), f.kind()})
+	}
+}
+
+// mustBeExported panics if f records that the value was obtained using
+// an unexported field.
+func (f flag) mustBeExported() {
+	if f == 0 || f&flagRO != 0 {
+		f.mustBeExportedSlow()
+	}
+}
+
+func (f flag) mustBeExportedSlow() {
+	if f == 0 {
+		panic(&ValueError{methodNameSkip(), Invalid})
+	}
+	if f&flagRO != 0 {
+		panic("reflect: " + methodNameSkip() + " using value obtained using unexported field")
+	}
+}
+
+// mustBeAssignable panics if f records that the value is not assignable,
+// which is to say that either it was obtained using an unexported field
+// or it is not addressable.
+func (f flag) mustBeAssignable() {
+	if f&flagRO != 0 || f&flagAddr == 0 {
+		f.mustBeAssignableSlow()
+	}
+}
+
+func (f flag) mustBeAssignableSlow() {
+	if f == 0 {
+		panic(&ValueError{methodNameSkip(), Invalid})
+	}
+	// Assignable if addressable and not read-only.
+	if f&flagRO != 0 {
+		panic("reflect: " + methodNameSkip() + " using value obtained using unexported field")
+	}
+	if f&flagAddr == 0 {
+		panic("reflect: " + methodNameSkip() + " using unaddressable value")
+	}
+}
+
+// Addr returns a pointer value representing the address of v.
+// It panics if CanAddr() returns false.
+// Addr is typically used to obtain a pointer to a struct field
+// or slice element in order to call a method that requires a
+// pointer receiver.
+func (v Value) Addr() Value {
+	if v.flag&flagAddr == 0 {
+		panic("reflect.Value.Addr of unaddressable value")
+	}
+	// Preserve flagRO instead of using v.flag.ro() so that
+	// v.Addr().Elem() is equivalent to v (#32772)
+	fl := v.flag & flagRO
+	return Value{v.typ.ptrTo(), v.ptr, fl | flag(Ptr)}
+}
+
+// Bool returns v's underlying value.
+// It panics if v's kind is not Bool.
+func (v Value) Bool() bool {
+	v.mustBe(Bool)
+	return *(*bool)(v.ptr)
+}
+
+// Bytes returns v's underlying value.
+// It panics if v's underlying value is not a slice of bytes.
+func (v Value) Bytes() []byte {
+	v.mustBe(Slice)
+	if v.typ.Elem().Kind() != Uint8 {
+		panic("reflect.Value.Bytes of non-byte slice")
+	}
+	// Slice is always bigger than a word; assume flagIndir.
+	return *(*[]byte)(v.ptr)
+}
+
+// runes returns v's underlying value.
+// It panics if v's underlying value is not a slice of runes (int32s).
+func (v Value) runes() []rune {
+	v.mustBe(Slice)
+	if v.typ.Elem().Kind() != Int32 {
+		panic("reflect.Value.Bytes of non-rune slice")
+	}
+	// Slice is always bigger than a word; assume flagIndir.
+	return *(*[]rune)(v.ptr)
+}
+
+// CanAddr reports whether the value's address can be obtained with Addr.
+// Such values are called addressable. A value is addressable if it is
+// an element of a slice, an element of an addressable array,
+// a field of an addressable struct, or the result of dereferencing a pointer.
+// If CanAddr returns false, calling Addr will panic.
+func (v Value) CanAddr() bool {
+	return v.flag&flagAddr != 0
+}
+
+// CanSet reports whether the value of v can be changed.
+// A Value can be changed only if it is addressable and was not
+// obtained by the use of unexported struct fields.
+// If CanSet returns false, calling Set or any type-specific
+// setter (e.g., SetBool, SetInt) will panic.
+func (v Value) CanSet() bool {
+	return v.flag&(flagAddr|flagRO) == flagAddr
+}
+
+// Call calls the function v with the input arguments in.
+// For example, if len(in) == 3, v.Call(in) represents the Go call v(in[0], in[1], in[2]).
+// Call panics if v's Kind is not Func.
+// It returns the output results as Values.
+// As in Go, each input argument must be assignable to the
+// type of the function's corresponding input parameter.
+// If v is a variadic function, Call creates the variadic slice parameter
+// itself, copying in the corresponding values.
+func (v Value) Call(in []Value) []Value {
+	v.mustBe(Func)
+	v.mustBeExported()
+	return v.call("Call", in)
+}
+
+// CallSlice calls the variadic function v with the input arguments in,
+// assigning the slice in[len(in)-1] to v's final variadic argument.
+// For example, if len(in) == 3, v.CallSlice(in) represents the Go call v(in[0], in[1], in[2]...).
+// CallSlice panics if v's Kind is not Func or if v is not variadic.
+// It returns the output results as Values.
+// As in Go, each input argument must be assignable to the
+// type of the function's corresponding input parameter.
+func (v Value) CallSlice(in []Value) []Value {
+	v.mustBe(Func)
+	v.mustBeExported()
+	return v.call("CallSlice", in)
+}
+
+var callGC bool // for testing; see TestCallMethodJump
+
+func (v Value) call(op string, in []Value) []Value {
+	// Get function pointer, type.
+	t := (*funcType)(unsafe.Pointer(v.typ))
+	var (
+		fn       unsafe.Pointer
+		rcvr     Value
+		rcvrtype *rtype
+	)
+	if v.flag&flagMethod != 0 {
+		rcvr = v
+		rcvrtype, t, fn = methodReceiver(op, v, int(v.flag)>>flagMethodShift)
+	} else if v.flag&flagIndir != 0 {
+		fn = *(*unsafe.Pointer)(v.ptr)
+	} else {
+		fn = v.ptr
+	}
+
+	if fn == nil {
+		panic("reflect.Value.Call: call of nil function")
+	}
+
+	isSlice := op == "CallSlice"
+	n := t.NumIn()
+	if isSlice {
+		if !t.IsVariadic() {
+			panic("reflect: CallSlice of non-variadic function")
+		}
+		if len(in) < n {
+			panic("reflect: CallSlice with too few input arguments")
+		}
+		if len(in) > n {
+			panic("reflect: CallSlice with too many input arguments")
+		}
+	} else {
+		if t.IsVariadic() {
+			n--
+		}
+		if len(in) < n {
+			panic("reflect: Call with too few input arguments")
+		}
+		if !t.IsVariadic() && len(in) > n {
+			panic("reflect: Call with too many input arguments")
+		}
+	}
+	for _, x := range in {
+		if x.Kind() == Invalid {
+			panic("reflect: " + op + " using zero Value argument")
+		}
+	}
+	for i := 0; i < n; i++ {
+		if xt, targ := in[i].Type(), t.In(i); !xt.AssignableTo(targ) {
+			panic("reflect: " + op + " using " + xt.String() + " as type " + targ.String())
+		}
+	}
+	if !isSlice && t.IsVariadic() {
+		// prepare slice for remaining values
+		m := len(in) - n
+		slice := MakeSlice(t.In(n), m, m)
+		elem := t.In(n).Elem()
+		for i := 0; i < m; i++ {
+			x := in[n+i]
+			if xt := x.Type(); !xt.AssignableTo(elem) {
+				panic("reflect: cannot use " + xt.String() + " as type " + elem.String() + " in " + op)
+			}
+			slice.Index(i).Set(x)
+		}
+		origIn := in
+		in = make([]Value, n+1)
+		copy(in[:n], origIn)
+		in[n] = slice
+	}
+
+	nin := len(in)
+	if nin != t.NumIn() {
+		panic("reflect.Value.Call: wrong argument count")
+	}
+	nout := t.NumOut()
+
+	// Compute frame type.
+	frametype, _, retOffset, _, framePool := funcLayout(t, rcvrtype)
+
+	// Allocate a chunk of memory for frame.
+	var args unsafe.Pointer
+	if nout == 0 {
+		args = framePool.Get().(unsafe.Pointer)
+	} else {
+		// Can't use pool if the function has return values.
+		// We will leak pointer to args in ret, so its lifetime is not scoped.
+		args = unsafe_New(frametype)
+	}
+	off := uintptr(0)
+
+	// Copy inputs into args.
+	if rcvrtype != nil {
+		storeRcvr(rcvr, args)
+		off = ptrSize
+	}
+	for i, v := range in {
+		v.mustBeExported()
+		targ := t.In(i).(*rtype)
+		a := uintptr(targ.align)
+		off = (off + a - 1) &^ (a - 1)
+		n := targ.size
+		if n == 0 {
+			// Not safe to compute args+off pointing at 0 bytes,
+			// because that might point beyond the end of the frame,
+			// but we still need to call assignTo to check assignability.
+			v.assignTo("reflect.Value.Call", targ, nil)
+			continue
+		}
+		addr := add(args, off, "n > 0")
+		v = v.assignTo("reflect.Value.Call", targ, addr)
+		if v.flag&flagIndir != 0 {
+			typedmemmove(targ, addr, v.ptr)
+		} else {
+			*(*unsafe.Pointer)(addr) = v.ptr
+		}
+		off += n
+	}
+
+	// Call.
+	call(frametype, fn, args, uint32(frametype.size), uint32(retOffset))
+
+	// For testing; see TestCallMethodJump.
+	if callGC {
+		runtime.GC()
+	}
+
+	var ret []Value
+	if nout == 0 {
+		typedmemclr(frametype, args)
+		framePool.Put(args)
+	} else {
+		// Zero the now unused input area of args,
+		// because the Values returned by this function contain pointers to the args object,
+		// and will thus keep the args object alive indefinitely.
+		typedmemclrpartial(frametype, args, 0, retOffset)
+
+		// Wrap Values around return values in args.
+		ret = make([]Value, nout)
+		off = retOffset
+		for i := 0; i < nout; i++ {
+			tv := t.Out(i)
+			a := uintptr(tv.Align())
+			off = (off + a - 1) &^ (a - 1)
+			if tv.Size() != 0 {
+				fl := flagIndir | flag(tv.Kind())
+				ret[i] = Value{tv.common(), add(args, off, "tv.Size() != 0"), fl}
+				// Note: this does introduce false sharing between results -
+				// if any result is live, they are all live.
+				// (And the space for the args is live as well, but as we've
+				// cleared that space it isn't as big a deal.)
+			} else {
+				// For zero-sized return value, args+off may point to the next object.
+				// In this case, return the zero value instead.
+				ret[i] = Zero(tv)
+			}
+			off += tv.Size()
+		}
+	}
+
+	return ret
+}
+
+// callReflect is the call implementation used by a function
+// returned by MakeFunc. In many ways it is the opposite of the
+// method Value.call above. The method above converts a call using Values
+// into a call of a function with a concrete argument frame, while
+// callReflect converts a call of a function with a concrete argument
+// frame into a call using Values.
+// It is in this file so that it can be next to the call method above.
+// The remainder of the MakeFunc implementation is in makefunc.go.
+//
+// NOTE: This function must be marked as a "wrapper" in the generated code,
+// so that the linker can make it work correctly for panic and recover.
+// The gc compilers know to do that for the name "reflect.callReflect".
+//
+// ctxt is the "closure" generated by MakeFunc.
+// frame is a pointer to the arguments to that closure on the stack.
+// retValid points to a boolean which should be set when the results
+// section of frame is set.
+func callReflect(ctxt *makeFuncImpl, frame unsafe.Pointer, retValid *bool) {
+	ftyp := ctxt.ftyp
+	f := ctxt.fn
+
+	// Copy argument frame into Values.
+	ptr := frame
+	off := uintptr(0)
+	in := make([]Value, 0, int(ftyp.inCount))
+	for _, typ := range ftyp.in() {
+		off += -off & uintptr(typ.align-1)
+		v := Value{typ, nil, flag(typ.Kind())}
+		if ifaceIndir(typ) {
+			// value cannot be inlined in interface data.
+			// Must make a copy, because f might keep a reference to it,
+			// and we cannot let f keep a reference to the stack frame
+			// after this function returns, not even a read-only reference.
+			v.ptr = unsafe_New(typ)
+			if typ.size > 0 {
+				typedmemmove(typ, v.ptr, add(ptr, off, "typ.size > 0"))
+			}
+			v.flag |= flagIndir
+		} else {
+			v.ptr = *(*unsafe.Pointer)(add(ptr, off, "1-ptr"))
+		}
+		in = append(in, v)
+		off += typ.size
+	}
+
+	// Call underlying function.
+	out := f(in)
+	numOut := ftyp.NumOut()
+	if len(out) != numOut {
+		panic("reflect: wrong return count from function created by MakeFunc")
+	}
+
+	// Copy results back into argument frame.
+	if numOut > 0 {
+		off += -off & (ptrSize - 1)
+		for i, typ := range ftyp.out() {
+			v := out[i]
+			if v.typ == nil {
+				panic("reflect: function created by MakeFunc using " + funcName(f) +
+					" returned zero Value")
+			}
+			if v.flag&flagRO != 0 {
+				panic("reflect: function created by MakeFunc using " + funcName(f) +
+					" returned value obtained from unexported field")
+			}
+			off += -off & uintptr(typ.align-1)
+			if typ.size == 0 {
+				continue
+			}
+			addr := add(ptr, off, "typ.size > 0")
+
+			// Convert v to type typ if v is assignable to a variable
+			// of type t in the language spec.
+			// See issue 28761.
+			if typ.Kind() == Interface {
+				// We must clear the destination before calling assignTo,
+				// in case assignTo writes (with memory barriers) to the
+				// target location used as scratch space. See issue 39541.
+				*(*uintptr)(addr) = 0
+				*(*uintptr)(add(addr, ptrSize, "typ.size == 2*ptrSize")) = 0
+			}
+			v = v.assignTo("reflect.MakeFunc", typ, addr)
+
+			// We are writing to stack. No write barrier.
+			if v.flag&flagIndir != 0 {
+				memmove(addr, v.ptr, typ.size)
+			} else {
+				*(*uintptr)(addr) = uintptr(v.ptr)
+			}
+			off += typ.size
+		}
+	}
+
+	// Announce that the return values are valid.
+	// After this point the runtime can depend on the return values being valid.
+	*retValid = true
+
+	// We have to make sure that the out slice lives at least until
+	// the runtime knows the return values are valid. Otherwise, the
+	// return values might not be scanned by anyone during a GC.
+	// (out would be dead, and the return slots not yet alive.)
+	runtime.KeepAlive(out)
+
+	// runtime.getArgInfo expects to be able to find ctxt on the
+	// stack when it finds our caller, makeFuncStub. Make sure it
+	// doesn't get garbage collected.
+	runtime.KeepAlive(ctxt)
+}
+
+// methodReceiver returns information about the receiver
+// described by v. The Value v may or may not have the
+// flagMethod bit set, so the kind cached in v.flag should
+// not be used.
+// The return value rcvrtype gives the method's actual receiver type.
+// The return value t gives the method type signature (without the receiver).
+// The return value fn is a pointer to the method code.
+func methodReceiver(op string, v Value, methodIndex int) (rcvrtype *rtype, t *funcType, fn unsafe.Pointer) {
+	i := methodIndex
+	if v.typ.Kind() == Interface {
+		tt := (*interfaceType)(unsafe.Pointer(v.typ))
+		if uint(i) >= uint(len(tt.methods)) {
+			panic("reflect: internal error: invalid method index")
+		}
+		m := &tt.methods[i]
+		if !tt.nameOff(m.name).isExported() {
+			panic("reflect: " + op + " of unexported method")
+		}
+		iface := (*nonEmptyInterface)(v.ptr)
+		if iface.itab == nil {
+			panic("reflect: " + op + " of method on nil interface value")
+		}
+		rcvrtype = iface.itab.typ
+		fn = unsafe.Pointer(&iface.itab.fun[i])
+		t = (*funcType)(unsafe.Pointer(tt.typeOff(m.typ)))
+	} else {
+		rcvrtype = v.typ
+		ms := v.typ.exportedMethods()
+		if uint(i) >= uint(len(ms)) {
+			panic("reflect: internal error: invalid method index")
+		}
+		m := ms[i]
+		if !v.typ.nameOff(m.name).isExported() {
+			panic("reflect: " + op + " of unexported method")
+		}
+		ifn := v.typ.textOff(m.ifn)
+		fn = unsafe.Pointer(&ifn)
+		t = (*funcType)(unsafe.Pointer(v.typ.typeOff(m.mtyp)))
+	}
+	return
+}
+
+// v is a method receiver. Store at p the word which is used to
+// encode that receiver at the start of the argument list.
+// Reflect uses the "interface" calling convention for
+// methods, which always uses one word to record the receiver.
+func storeRcvr(v Value, p unsafe.Pointer) {
+	t := v.typ
+	if t.Kind() == Interface {
+		// the interface data word becomes the receiver word
+		iface := (*nonEmptyInterface)(v.ptr)
+		*(*unsafe.Pointer)(p) = iface.word
+	} else if v.flag&flagIndir != 0 && !ifaceIndir(t) {
+		*(*unsafe.Pointer)(p) = *(*unsafe.Pointer)(v.ptr)
+	} else {
+		*(*unsafe.Pointer)(p) = v.ptr
+	}
+}
+
+// align returns the result of rounding x up to a multiple of n.
+// n must be a power of two.
+func align(x, n uintptr) uintptr {
+	return (x + n - 1) &^ (n - 1)
+}
+
+// callMethod is the call implementation used by a function returned
+// by makeMethodValue (used by v.Method(i).Interface()).
+// It is a streamlined version of the usual reflect call: the caller has
+// already laid out the argument frame for us, so we don't have
+// to deal with individual Values for each argument.
+// It is in this file so that it can be next to the two similar functions above.
+// The remainder of the makeMethodValue implementation is in makefunc.go.
+//
+// NOTE: This function must be marked as a "wrapper" in the generated code,
+// so that the linker can make it work correctly for panic and recover.
+// The gc compilers know to do that for the name "reflect.callMethod".
+//
+// ctxt is the "closure" generated by makeVethodValue.
+// frame is a pointer to the arguments to that closure on the stack.
+// retValid points to a boolean which should be set when the results
+// section of frame is set.
+func callMethod(ctxt *methodValue, frame unsafe.Pointer, retValid *bool) {
+	rcvr := ctxt.rcvr
+	rcvrtype, t, fn := methodReceiver("call", rcvr, ctxt.method)
+	frametype, argSize, retOffset, _, framePool := funcLayout(t, rcvrtype)
+
+	// Make a new frame that is one word bigger so we can store the receiver.
+	// This space is used for both arguments and return values.
+	scratch := framePool.Get().(unsafe.Pointer)
+
+	// Copy in receiver and rest of args.
+	storeRcvr(rcvr, scratch)
+	// Align the first arg. The alignment can't be larger than ptrSize.
+	argOffset := uintptr(ptrSize)
+	if len(t.in()) > 0 {
+		argOffset = align(argOffset, uintptr(t.in()[0].align))
+	}
+	// Avoid constructing out-of-bounds pointers if there are no args.
+	if argSize-argOffset > 0 {
+		typedmemmovepartial(frametype, add(scratch, argOffset, "argSize > argOffset"), frame, argOffset, argSize-argOffset)
+	}
+
+	// Call.
+	// Call copies the arguments from scratch to the stack, calls fn,
+	// and then copies the results back into scratch.
+	call(frametype, fn, scratch, uint32(frametype.size), uint32(retOffset))
+
+	// Copy return values.
+	// Ignore any changes to args and just copy return values.
+	// Avoid constructing out-of-bounds pointers if there are no return values.
+	if frametype.size-retOffset > 0 {
+		callerRetOffset := retOffset - argOffset
+		// This copies to the stack. Write barriers are not needed.
+		memmove(add(frame, callerRetOffset, "frametype.size > retOffset"),
+			add(scratch, retOffset, "frametype.size > retOffset"),
+			frametype.size-retOffset)
+	}
+
+	// Tell the runtime it can now depend on the return values
+	// being properly initialized.
+	*retValid = true
+
+	// Clear the scratch space and put it back in the pool.
+	// This must happen after the statement above, so that the return
+	// values will always be scanned by someone.
+	typedmemclr(frametype, scratch)
+	framePool.Put(scratch)
+
+	// See the comment in callReflect.
+	runtime.KeepAlive(ctxt)
+}
+
+// funcName returns the name of f, for use in error messages.
+func funcName(f func([]Value) []Value) string {
+	pc := *(*uintptr)(unsafe.Pointer(&f))
+	rf := runtime.FuncForPC(pc)
+	if rf != nil {
+		return rf.Name()
+	}
+	return "closure"
+}
+
+// Cap returns v's capacity.
+// It panics if v's Kind is not Array, Chan, or Slice.
+func (v Value) Cap() int {
+	k := v.kind()
+	switch k {
+	case Array:
+		return v.typ.Len()
+	case Chan:
+		return chancap(v.pointer())
+	case Slice:
+		// Slice is always bigger than a word; assume flagIndir.
+		return (*unsafeheader.Slice)(v.ptr).Cap
+	}
+	panic(&ValueError{"reflect.Value.Cap", v.kind()})
+}
+
+// Close closes the channel v.
+// It panics if v's Kind is not Chan.
+func (v Value) Close() {
+	v.mustBe(Chan)
+	v.mustBeExported()
+	chanclose(v.pointer())
+}
+
+// Complex returns v's underlying value, as a complex128.
+// It panics if v's Kind is not Complex64 or Complex128
+func (v Value) Complex() complex128 {
+	k := v.kind()
+	switch k {
+	case Complex64:
+		return complex128(*(*complex64)(v.ptr))
+	case Complex128:
+		return *(*complex128)(v.ptr)
+	}
+	panic(&ValueError{"reflect.Value.Complex", v.kind()})
+}
+
+// Elem returns the value that the interface v contains
+// or that the pointer v points to.
+// It panics if v's Kind is not Interface or Ptr.
+// It returns the zero Value if v is nil.
+func (v Value) Elem() Value {
+	k := v.kind()
+	switch k {
+	case Interface:
+		var eface interface{}
+		if v.typ.NumMethod() == 0 {
+			eface = *(*interface{})(v.ptr)
+		} else {
+			eface = (interface{})(*(*interface {
+				M()
+			})(v.ptr))
+		}
+		x := unpackEface(eface)
+		if x.flag != 0 {
+			x.flag |= v.flag.ro()
+		}
+		return x
+	case Ptr:
+		ptr := v.ptr
+		if v.flag&flagIndir != 0 {
+			ptr = *(*unsafe.Pointer)(ptr)
+		}
+		// The returned value's address is v's value.
+		if ptr == nil {
+			return Value{}
+		}
+		tt := (*ptrType)(unsafe.Pointer(v.typ))
+		typ := tt.elem
+		fl := v.flag&flagRO | flagIndir | flagAddr
+		fl |= flag(typ.Kind())
+		return Value{typ, ptr, fl}
+	}
+	panic(&ValueError{"reflect.Value.Elem", v.kind()})
+}
+
+// Field returns the i'th field of the struct v.
+// It panics if v's Kind is not Struct or i is out of range.
+func (v Value) Field(i int) Value {
+	if v.kind() != Struct {
+		panic(&ValueError{"reflect.Value.Field", v.kind()})
+	}
+	tt := (*structType)(unsafe.Pointer(v.typ))
+	if uint(i) >= uint(len(tt.fields)) {
+		panic("reflect: Field index out of range")
+	}
+	field := &tt.fields[i]
+	typ := field.typ
+
+	// Inherit permission bits from v, but clear flagEmbedRO.
+	fl := v.flag&(flagStickyRO|flagIndir|flagAddr) | flag(typ.Kind())
+	// Using an unexported field forces flagRO.
+	if !field.name.isExported() {
+		if field.embedded() {
+			fl |= flagEmbedRO
+		} else {
+			fl |= flagStickyRO
+		}
+	}
+	// Either flagIndir is set and v.ptr points at struct,
+	// or flagIndir is not set and v.ptr is the actual struct data.
+	// In the former case, we want v.ptr + offset.
+	// In the latter case, we must have field.offset = 0,
+	// so v.ptr + field.offset is still the correct address.
+	ptr := add(v.ptr, field.offset(), "same as non-reflect &v.field")
+	return Value{typ, ptr, fl}
+}
+
+// FieldByIndex returns the nested field corresponding to index.
+// It panics if v's Kind is not struct.
+func (v Value) FieldByIndex(index []int) Value {
+	if len(index) == 1 {
+		return v.Field(index[0])
+	}
+	v.mustBe(Struct)
+	for i, x := range index {
+		if i > 0 {
+			if v.Kind() == Ptr && v.typ.Elem().Kind() == Struct {
+				if v.IsNil() {
+					panic("reflect: indirection through nil pointer to embedded struct")
+				}
+				v = v.Elem()
+			}
+		}
+		v = v.Field(x)
+	}
+	return v
+}
+
+// FieldByName returns the struct field with the given name.
+// It returns the zero Value if no field was found.
+// It panics if v's Kind is not struct.
+func (v Value) FieldByName(name string) Value {
+	v.mustBe(Struct)
+	if f, ok := v.typ.FieldByName(name); ok {
+		return v.FieldByIndex(f.Index)
+	}
+	return Value{}
+}
+
+// FieldByNameFunc returns the struct field with a name
+// that satisfies the match function.
+// It panics if v's Kind is not struct.
+// It returns the zero Value if no field was found.
+func (v Value) FieldByNameFunc(match func(string) bool) Value {
+	if f, ok := v.typ.FieldByNameFunc(match); ok {
+		return v.FieldByIndex(f.Index)
+	}
+	return Value{}
+}
+
+// Float returns v's underlying value, as a float64.
+// It panics if v's Kind is not Float32 or Float64
+func (v Value) Float() float64 {
+	k := v.kind()
+	switch k {
+	case Float32:
+		return float64(*(*float32)(v.ptr))
+	case Float64:
+		return *(*float64)(v.ptr)
+	}
+	panic(&ValueError{"reflect.Value.Float", v.kind()})
+}
+
+var uint8Type = TypeOf(uint8(0)).(*rtype)
+
+// Index returns v's i'th element.
+// It panics if v's Kind is not Array, Slice, or String or i is out of range.
+func (v Value) Index(i int) Value {
+	switch v.kind() {
+	case Array:
+		tt := (*arrayType)(unsafe.Pointer(v.typ))
+		if uint(i) >= uint(tt.len) {
+			panic("reflect: array index out of range")
+		}
+		typ := tt.elem
+		offset := uintptr(i) * typ.size
+
+		// Either flagIndir is set and v.ptr points at array,
+		// or flagIndir is not set and v.ptr is the actual array data.
+		// In the former case, we want v.ptr + offset.
+		// In the latter case, we must be doing Index(0), so offset = 0,
+		// so v.ptr + offset is still the correct address.
+		val := add(v.ptr, offset, "same as &v[i], i < tt.len")
+		fl := v.flag&(flagIndir|flagAddr) | v.flag.ro() | flag(typ.Kind()) // bits same as overall array
+		return Value{typ, val, fl}
+
+	case Slice:
+		// Element flag same as Elem of Ptr.
+		// Addressable, indirect, possibly read-only.
+		s := (*unsafeheader.Slice)(v.ptr)
+		if uint(i) >= uint(s.Len) {
+			panic("reflect: slice index out of range")
+		}
+		tt := (*sliceType)(unsafe.Pointer(v.typ))
+		typ := tt.elem
+		val := arrayAt(s.Data, i, typ.size, "i < s.Len")
+		fl := flagAddr | flagIndir | v.flag.ro() | flag(typ.Kind())
+		return Value{typ, val, fl}
+
+	case String:
+		s := (*unsafeheader.String)(v.ptr)
+		if uint(i) >= uint(s.Len) {
+			panic("reflect: string index out of range")
+		}
+		p := arrayAt(s.Data, i, 1, "i < s.Len")
+		fl := v.flag.ro() | flag(Uint8) | flagIndir
+		return Value{uint8Type, p, fl}
+	}
+	panic(&ValueError{"reflect.Value.Index", v.kind()})
+}
+
+// Int returns v's underlying value, as an int64.
+// It panics if v's Kind is not Int, Int8, Int16, Int32, or Int64.
+func (v Value) Int() int64 {
+	k := v.kind()
+	p := v.ptr
+	switch k {
+	case Int:
+		return int64(*(*int)(p))
+	case Int8:
+		return int64(*(*int8)(p))
+	case Int16:
+		return int64(*(*int16)(p))
+	case Int32:
+		return int64(*(*int32)(p))
+	case Int64:
+		return *(*int64)(p)
+	}
+	panic(&ValueError{"reflect.Value.Int", v.kind()})
+}
+
+// CanInterface reports whether Interface can be used without panicking.
+func (v Value) CanInterface() bool {
+	if v.flag == 0 {
+		panic(&ValueError{"reflect.Value.CanInterface", Invalid})
+	}
+	return v.flag&flagRO == 0
+}
+
+// Interface returns v's current value as an interface{}.
+// It is equivalent to:
+//	var i interface{} = (v's underlying value)
+// It panics if the Value was obtained by accessing
+// unexported struct fields.
+func (v Value) Interface() (i interface{}) {
+	return valueInterface(v, true)
+}
+
+func valueInterface(v Value, safe bool) interface{} {
+	if v.flag == 0 {
+		panic(&ValueError{"reflect.Value.Interface", Invalid})
+	}
+	if safe && v.flag&flagRO != 0 {
+		// Do not allow access to unexported values via Interface,
+		// because they might be pointers that should not be
+		// writable or methods or function that should not be callable.
+		panic("reflect.Value.Interface: cannot return value obtained from unexported field or method")
+	}
+	if v.flag&flagMethod != 0 {
+		v = makeMethodValue("Interface", v)
+	}
+
+	if v.kind() == Interface {
+		// Special case: return the element inside the interface.
+		// Empty interface has one layout, all interfaces with
+		// methods have a second layout.
+		if v.NumMethod() == 0 {
+			return *(*interface{})(v.ptr)
+		}
+		return *(*interface {
+			M()
+		})(v.ptr)
+	}
+
+	// TODO: pass safe to packEface so we don't need to copy if safe==true?
+	return packEface(v)
+}
+
+// InterfaceData returns the interface v's value as a uintptr pair.
+// It panics if v's Kind is not Interface.
+func (v Value) InterfaceData() [2]uintptr {
+	// TODO: deprecate this
+	v.mustBe(Interface)
+	// We treat this as a read operation, so we allow
+	// it even for unexported data, because the caller
+	// has to import "unsafe" to turn it into something
+	// that can be abused.
+	// Interface value is always bigger than a word; assume flagIndir.
+	return *(*[2]uintptr)(v.ptr)
+}
+
+// IsNil reports whether its argument v is nil. The argument must be
+// a chan, func, interface, map, pointer, or slice value; if it is
+// not, IsNil panics. Note that IsNil is not always equivalent to a
+// regular comparison with nil in Go. For example, if v was created
+// by calling ValueOf with an uninitialized interface variable i,
+// i==nil will be true but v.IsNil will panic as v will be the zero
+// Value.
+func (v Value) IsNil() bool {
+	k := v.kind()
+	switch k {
+	case Chan, Func, Map, Ptr, UnsafePointer:
+		if v.flag&flagMethod != 0 {
+			return false
+		}
+		ptr := v.ptr
+		if v.flag&flagIndir != 0 {
+			ptr = *(*unsafe.Pointer)(ptr)
+		}
+		return ptr == nil
+	case Interface, Slice:
+		// Both interface and slice are nil if first word is 0.
+		// Both are always bigger than a word; assume flagIndir.
+		return *(*unsafe.Pointer)(v.ptr) == nil
+	}
+	panic(&ValueError{"reflect.Value.IsNil", v.kind()})
+}
+
+// IsValid reports whether v represents a value.
+// It returns false if v is the zero Value.
+// If IsValid returns false, all other methods except String panic.
+// Most functions and methods never return an invalid Value.
+// If one does, its documentation states the conditions explicitly.
+func (v Value) IsValid() bool {
+	return v.flag != 0
+}
+
+// IsZero reports whether v is the zero value for its type.
+// It panics if the argument is invalid.
+func (v Value) IsZero() bool {
+	switch v.kind() {
+	case Bool:
+		return !v.Bool()
+	case Int, Int8, Int16, Int32, Int64:
+		return v.Int() == 0
+	case Uint, Uint8, Uint16, Uint32, Uint64, Uintptr:
+		return v.Uint() == 0
+	case Float32, Float64:
+		return math.Float64bits(v.Float()) == 0
+	case Complex64, Complex128:
+		c := v.Complex()
+		return math.Float64bits(real(c)) == 0 && math.Float64bits(imag(c)) == 0
+	case Array:
+		for i := 0; i < v.Len(); i++ {
+			if !v.Index(i).IsZero() {
+				return false
+			}
+		}
+		return true
+	case Chan, Func, Interface, Map, Ptr, Slice, UnsafePointer:
+		return v.IsNil()
+	case String:
+		return v.Len() == 0
+	case Struct:
+		for i := 0; i < v.NumField(); i++ {
+			if !v.Field(i).IsZero() {
+				return false
+			}
+		}
+		return true
+	default:
+		// This should never happens, but will act as a safeguard for
+		// later, as a default value doesn't makes sense here.
+		panic(&ValueError{"reflect.Value.IsZero", v.Kind()})
+	}
+}
+
+// Kind returns v's Kind.
+// If v is the zero Value (IsValid returns false), Kind returns Invalid.
+func (v Value) Kind() Kind {
+	return v.kind()
+}
+
+// Len returns v's length.
+// It panics if v's Kind is not Array, Chan, Map, Slice, or String.
+func (v Value) Len() int {
+	k := v.kind()
+	switch k {
+	case Array:
+		tt := (*arrayType)(unsafe.Pointer(v.typ))
+		return int(tt.len)
+	case Chan:
+		return chanlen(v.pointer())
+	case Map:
+		return maplen(v.pointer())
+	case Slice:
+		// Slice is bigger than a word; assume flagIndir.
+		return (*unsafeheader.Slice)(v.ptr).Len
+	case String:
+		// String is bigger than a word; assume flagIndir.
+		return (*unsafeheader.String)(v.ptr).Len
+	}
+	panic(&ValueError{"reflect.Value.Len", v.kind()})
+}
+
+// MapIndex returns the value associated with key in the map v.
+// It panics if v's Kind is not Map.
+// It returns the zero Value if key is not found in the map or if v represents a nil map.
+// As in Go, the key's value must be assignable to the map's key type.
+func (v Value) MapIndex(key Value) Value {
+	v.mustBe(Map)
+	tt := (*mapType)(unsafe.Pointer(v.typ))
+
+	// Do not require key to be exported, so that DeepEqual
+	// and other programs can use all the keys returned by
+	// MapKeys as arguments to MapIndex. If either the map
+	// or the key is unexported, though, the result will be
+	// considered unexported. This is consistent with the
+	// behavior for structs, which allow read but not write
+	// of unexported fields.
+	key = key.assignTo("reflect.Value.MapIndex", tt.key, nil)
+
+	var k unsafe.Pointer
+	if key.flag&flagIndir != 0 {
+		k = key.ptr
+	} else {
+		k = unsafe.Pointer(&key.ptr)
+	}
+	e := mapaccess(v.typ, v.pointer(), k)
+	if e == nil {
+		return Value{}
+	}
+	typ := tt.elem
+	fl := (v.flag | key.flag).ro()
+	fl |= flag(typ.Kind())
+	return copyVal(typ, fl, e)
+}
+
+// MapKeys returns a slice containing all the keys present in the map,
+// in unspecified order.
+// It panics if v's Kind is not Map.
+// It returns an empty slice if v represents a nil map.
+func (v Value) MapKeys() []Value {
+	v.mustBe(Map)
+	tt := (*mapType)(unsafe.Pointer(v.typ))
+	keyType := tt.key
+
+	fl := v.flag.ro() | flag(keyType.Kind())
+
+	m := v.pointer()
+	mlen := int(0)
+	if m != nil {
+		mlen = maplen(m)
+	}
+	it := mapiterinit(v.typ, m)
+	a := make([]Value, mlen)
+	var i int
+	for i = 0; i < len(a); i++ {
+		key := mapiterkey(it)
+		if key == nil {
+			// Someone deleted an entry from the map since we
+			// called maplen above. It's a data race, but nothing
+			// we can do about it.
+			break
+		}
+		a[i] = copyVal(keyType, fl, key)
+		mapiternext(it)
+	}
+	return a[:i]
+}
+
+// A MapIter is an iterator for ranging over a map.
+// See Value.MapRange.
+type MapIter struct {
+	m  Value
+	it unsafe.Pointer
+}
+
+// Key returns the key of the iterator's current map entry.
+func (it *MapIter) Key() Value {
+	if it.it == nil {
+		panic("MapIter.Key called before Next")
+	}
+	if mapiterkey(it.it) == nil {
+		panic("MapIter.Key called on exhausted iterator")
+	}
+
+	t := (*mapType)(unsafe.Pointer(it.m.typ))
+	ktype := t.key
+	return copyVal(ktype, it.m.flag.ro()|flag(ktype.Kind()), mapiterkey(it.it))
+}
+
+// Value returns the value of the iterator's current map entry.
+func (it *MapIter) Value() Value {
+	if it.it == nil {
+		panic("MapIter.Value called before Next")
+	}
+	if mapiterkey(it.it) == nil {
+		panic("MapIter.Value called on exhausted iterator")
+	}
+
+	t := (*mapType)(unsafe.Pointer(it.m.typ))
+	vtype := t.elem
+	return copyVal(vtype, it.m.flag.ro()|flag(vtype.Kind()), mapiterelem(it.it))
+}
+
+// Next advances the map iterator and reports whether there is another
+// entry. It returns false when the iterator is exhausted; subsequent
+// calls to Key, Value, or Next will panic.
+func (it *MapIter) Next() bool {
+	if it.it == nil {
+		it.it = mapiterinit(it.m.typ, it.m.pointer())
+	} else {
+		if mapiterkey(it.it) == nil {
+			panic("MapIter.Next called on exhausted iterator")
+		}
+		mapiternext(it.it)
+	}
+	return mapiterkey(it.it) != nil
+}
+
+// MapRange returns a range iterator for a map.
+// It panics if v's Kind is not Map.
+//
+// Call Next to advance the iterator, and Key/Value to access each entry.
+// Next returns false when the iterator is exhausted.
+// MapRange follows the same iteration semantics as a range statement.
+//
+// Example:
+//
+//	iter := reflect.ValueOf(m).MapRange()
+// 	for iter.Next() {
+//		k := iter.Key()
+//		v := iter.Value()
+//		...
+//	}
+//
+func (v Value) MapRange() *MapIter {
+	v.mustBe(Map)
+	return &MapIter{m: v}
+}
+
+// copyVal returns a Value containing the map key or value at ptr,
+// allocating a new variable as needed.
+func copyVal(typ *rtype, fl flag, ptr unsafe.Pointer) Value {
+	if ifaceIndir(typ) {
+		// Copy result so future changes to the map
+		// won't change the underlying value.
+		c := unsafe_New(typ)
+		typedmemmove(typ, c, ptr)
+		return Value{typ, c, fl | flagIndir}
+	}
+	return Value{typ, *(*unsafe.Pointer)(ptr), fl}
+}
+
+// Method returns a function value corresponding to v's i'th method.
+// The arguments to a Call on the returned function should not include
+// a receiver; the returned function will always use v as the receiver.
+// Method panics if i is out of range or if v is a nil interface value.
+func (v Value) Method(i int) Value {
+	if v.typ == nil {
+		panic(&ValueError{"reflect.Value.Method", Invalid})
+	}
+	if v.flag&flagMethod != 0 || uint(i) >= uint(v.typ.NumMethod()) {
+		panic("reflect: Method index out of range")
+	}
+	if v.typ.Kind() == Interface && v.IsNil() {
+		panic("reflect: Method on nil interface value")
+	}
+	fl := v.flag.ro() | (v.flag & flagIndir)
+	fl |= flag(Func)
+	fl |= flag(i)<<flagMethodShift | flagMethod
+	return Value{v.typ, v.ptr, fl}
+}
+
+// NumMethod returns the number of exported methods in the value's method set.
+func (v Value) NumMethod() int {
+	if v.typ == nil {
+		panic(&ValueError{"reflect.Value.NumMethod", Invalid})
+	}
+	if v.flag&flagMethod != 0 {
+		return 0
+	}
+	return v.typ.NumMethod()
+}
+
+// MethodByName returns a function value corresponding to the method
+// of v with the given name.
+// The arguments to a Call on the returned function should not include
+// a receiver; the returned function will always use v as the receiver.
+// It returns the zero Value if no method was found.
+func (v Value) MethodByName(name string) Value {
+	if v.typ == nil {
+		panic(&ValueError{"reflect.Value.MethodByName", Invalid})
+	}
+	if v.flag&flagMethod != 0 {
+		return Value{}
+	}
+	m, ok := v.typ.MethodByName(name)
+	if !ok {
+		return Value{}
+	}
+	return v.Method(m.Index)
+}
+
+// NumField returns the number of fields in the struct v.
+// It panics if v's Kind is not Struct.
+func (v Value) NumField() int {
+	v.mustBe(Struct)
+	tt := (*structType)(unsafe.Pointer(v.typ))
+	return len(tt.fields)
+}
+
+// OverflowComplex reports whether the complex128 x cannot be represented by v's type.
+// It panics if v's Kind is not Complex64 or Complex128.
+func (v Value) OverflowComplex(x complex128) bool {
+	k := v.kind()
+	switch k {
+	case Complex64:
+		return overflowFloat32(real(x)) || overflowFloat32(imag(x))
+	case Complex128:
+		return false
+	}
+	panic(&ValueError{"reflect.Value.OverflowComplex", v.kind()})
+}
+
+// OverflowFloat reports whether the float64 x cannot be represented by v's type.
+// It panics if v's Kind is not Float32 or Float64.
+func (v Value) OverflowFloat(x float64) bool {
+	k := v.kind()
+	switch k {
+	case Float32:
+		return overflowFloat32(x)
+	case Float64:
+		return false
+	}
+	panic(&ValueError{"reflect.Value.OverflowFloat", v.kind()})
+}
+
+func overflowFloat32(x float64) bool {
+	if x < 0 {
+		x = -x
+	}
+	return math.MaxFloat32 < x && x <= math.MaxFloat64
+}
+
+// OverflowInt reports whether the int64 x cannot be represented by v's type.
+// It panics if v's Kind is not Int, Int8, Int16, Int32, or Int64.
+func (v Value) OverflowInt(x int64) bool {
+	k := v.kind()
+	switch k {
+	case Int, Int8, Int16, Int32, Int64:
+		bitSize := v.typ.size * 8
+		trunc := (x << (64 - bitSize)) >> (64 - bitSize)
+		return x != trunc
+	}
+	panic(&ValueError{"reflect.Value.OverflowInt", v.kind()})
+}
+
+// OverflowUint reports whether the uint64 x cannot be represented by v's type.
+// It panics if v's Kind is not Uint, Uintptr, Uint8, Uint16, Uint32, or Uint64.
+func (v Value) OverflowUint(x uint64) bool {
+	k := v.kind()
+	switch k {
+	case Uint, Uintptr, Uint8, Uint16, Uint32, Uint64:
+		bitSize := v.typ.size * 8
+		trunc := (x << (64 - bitSize)) >> (64 - bitSize)
+		return x != trunc
+	}
+	panic(&ValueError{"reflect.Value.OverflowUint", v.kind()})
+}
+
+//go:nocheckptr
+// This prevents inlining Value.Pointer when -d=checkptr is enabled,
+// which ensures cmd/compile can recognize unsafe.Pointer(v.Pointer())
+// and make an exception.
+
+// Pointer returns v's value as a uintptr.
+// It returns uintptr instead of unsafe.Pointer so that
+// code using reflect cannot obtain unsafe.Pointers
+// without importing the unsafe package explicitly.
+// It panics if v's Kind is not Chan, Func, Map, Ptr, Slice, or UnsafePointer.
+//
+// If v's Kind is Func, the returned pointer is an underlying
+// code pointer, but not necessarily enough to identify a
+// single function uniquely. The only guarantee is that the
+// result is zero if and only if v is a nil func Value.
+//
+// If v's Kind is Slice, the returned pointer is to the first
+// element of the slice. If the slice is nil the returned value
+// is 0.  If the slice is empty but non-nil the return value is non-zero.
+func (v Value) Pointer() uintptr {
+	// TODO: deprecate
+	k := v.kind()
+	switch k {
+	case Ptr:
+		if v.typ.ptrdata == 0 {
+			// Handle pointers to go:notinheap types directly,
+			// so we never materialize such pointers as an
+			// unsafe.Pointer. (Such pointers are always indirect.)
+			// See issue 42076.
+			return *(*uintptr)(v.ptr)
+		}
+		fallthrough
+	case Chan, Map, UnsafePointer:
+		return uintptr(v.pointer())
+	case Func:
+		if v.flag&flagMethod != 0 {
+			// As the doc comment says, the returned pointer is an
+			// underlying code pointer but not necessarily enough to
+			// identify a single function uniquely. All method expressions
+			// created via reflect have the same underlying code pointer,
+			// so their Pointers are equal. The function used here must
+			// match the one used in makeMethodValue.
+			f := methodValueCall
+			return **(**uintptr)(unsafe.Pointer(&f))
+		}
+		p := v.pointer()
+		// Non-nil func value points at data block.
+		// First word of data block is actual code.
+		if p != nil {
+			p = *(*unsafe.Pointer)(p)
+		}
+		return uintptr(p)
+
+	case Slice:
+		return (*SliceHeader)(v.ptr).Data
+	}
+	panic(&ValueError{"reflect.Value.Pointer", v.kind()})
+}
+
+// Recv receives and returns a value from the channel v.
+// It panics if v's Kind is not Chan.
+// The receive blocks until a value is ready.
+// The boolean value ok is true if the value x corresponds to a send
+// on the channel, false if it is a zero value received because the channel is closed.
+func (v Value) Recv() (x Value, ok bool) {
+	v.mustBe(Chan)
+	v.mustBeExported()
+	return v.recv(false)
+}
+
+// internal recv, possibly non-blocking (nb).
+// v is known to be a channel.
+func (v Value) recv(nb bool) (val Value, ok bool) {
+	tt := (*chanType)(unsafe.Pointer(v.typ))
+	if ChanDir(tt.dir)&RecvDir == 0 {
+		panic("reflect: recv on send-only channel")
+	}
+	t := tt.elem
+	val = Value{t, nil, flag(t.Kind())}
+	var p unsafe.Pointer
+	if ifaceIndir(t) {
+		p = unsafe_New(t)
+		val.ptr = p
+		val.flag |= flagIndir
+	} else {
+		p = unsafe.Pointer(&val.ptr)
+	}
+	selected, ok := chanrecv(v.pointer(), nb, p)
+	if !selected {
+		val = Value{}
+	}
+	return
+}
+
+// Send sends x on the channel v.
+// It panics if v's kind is not Chan or if x's type is not the same type as v's element type.
+// As in Go, x's value must be assignable to the channel's element type.
+func (v Value) Send(x Value) {
+	v.mustBe(Chan)
+	v.mustBeExported()
+	v.send(x, false)
+}
+
+// internal send, possibly non-blocking.
+// v is known to be a channel.
+func (v Value) send(x Value, nb bool) (selected bool) {
+	tt := (*chanType)(unsafe.Pointer(v.typ))
+	if ChanDir(tt.dir)&SendDir == 0 {
+		panic("reflect: send on recv-only channel")
+	}
+	x.mustBeExported()
+	x = x.assignTo("reflect.Value.Send", tt.elem, nil)
+	var p unsafe.Pointer
+	if x.flag&flagIndir != 0 {
+		p = x.ptr
+	} else {
+		p = unsafe.Pointer(&x.ptr)
+	}
+	return chansend(v.pointer(), p, nb)
+}
+
+// Set assigns x to the value v.
+// It panics if CanSet returns false.
+// As in Go, x's value must be assignable to v's type.
+func (v Value) Set(x Value) {
+	v.mustBeAssignable()
+	x.mustBeExported() // do not let unexported x leak
+	var target unsafe.Pointer
+	if v.kind() == Interface {
+		target = v.ptr
+	}
+	x = x.assignTo("reflect.Set", v.typ, target)
+	if x.flag&flagIndir != 0 {
+		if x.ptr == unsafe.Pointer(&zeroVal[0]) {
+			typedmemclr(v.typ, v.ptr)
+		} else {
+			typedmemmove(v.typ, v.ptr, x.ptr)
+		}
+	} else {
+		*(*unsafe.Pointer)(v.ptr) = x.ptr
+	}
+}
+
+// SetBool sets v's underlying value.
+// It panics if v's Kind is not Bool or if CanSet() is false.
+func (v Value) SetBool(x bool) {
+	v.mustBeAssignable()
+	v.mustBe(Bool)
+	*(*bool)(v.ptr) = x
+}
+
+// SetBytes sets v's underlying value.
+// It panics if v's underlying value is not a slice of bytes.
+func (v Value) SetBytes(x []byte) {
+	v.mustBeAssignable()
+	v.mustBe(Slice)
+	if v.typ.Elem().Kind() != Uint8 {
+		panic("reflect.Value.SetBytes of non-byte slice")
+	}
+	*(*[]byte)(v.ptr) = x
+}
+
+// setRunes sets v's underlying value.
+// It panics if v's underlying value is not a slice of runes (int32s).
+func (v Value) setRunes(x []rune) {
+	v.mustBeAssignable()
+	v.mustBe(Slice)
+	if v.typ.Elem().Kind() != Int32 {
+		panic("reflect.Value.setRunes of non-rune slice")
+	}
+	*(*[]rune)(v.ptr) = x
+}
+
+// SetComplex sets v's underlying value to x.
+// It panics if v's Kind is not Complex64 or Complex128, or if CanSet() is false.
+func (v Value) SetComplex(x complex128) {
+	v.mustBeAssignable()
+	switch k := v.kind(); k {
+	default:
+		panic(&ValueError{"reflect.Value.SetComplex", v.kind()})
+	case Complex64:
+		*(*complex64)(v.ptr) = complex64(x)
+	case Complex128:
+		*(*complex128)(v.ptr) = x
+	}
+}
+
+// SetFloat sets v's underlying value to x.
+// It panics if v's Kind is not Float32 or Float64, or if CanSet() is false.
+func (v Value) SetFloat(x float64) {
+	v.mustBeAssignable()
+	switch k := v.kind(); k {
+	default:
+		panic(&ValueError{"reflect.Value.SetFloat", v.kind()})
+	case Float32:
+		*(*float32)(v.ptr) = float32(x)
+	case Float64:
+		*(*float64)(v.ptr) = x
+	}
+}
+
+// SetInt sets v's underlying value to x.
+// It panics if v's Kind is not Int, Int8, Int16, Int32, or Int64, or if CanSet() is false.
+func (v Value) SetInt(x int64) {
+	v.mustBeAssignable()
+	switch k := v.kind(); k {
+	default:
+		panic(&ValueError{"reflect.Value.SetInt", v.kind()})
+	case Int:
+		*(*int)(v.ptr) = int(x)
+	case Int8:
+		*(*int8)(v.ptr) = int8(x)
+	case Int16:
+		*(*int16)(v.ptr) = int16(x)
+	case Int32:
+		*(*int32)(v.ptr) = int32(x)
+	case Int64:
+		*(*int64)(v.ptr) = x
+	}
+}
+
+// SetLen sets v's length to n.
+// It panics if v's Kind is not Slice or if n is negative or
+// greater than the capacity of the slice.
+func (v Value) SetLen(n int) {
+	v.mustBeAssignable()
+	v.mustBe(Slice)
+	s := (*unsafeheader.Slice)(v.ptr)
+	if uint(n) > uint(s.Cap) {
+		panic("reflect: slice length out of range in SetLen")
+	}
+	s.Len = n
+}
+
+// SetCap sets v's capacity to n.
+// It panics if v's Kind is not Slice or if n is smaller than the length or
+// greater than the capacity of the slice.
+func (v Value) SetCap(n int) {
+	v.mustBeAssignable()
+	v.mustBe(Slice)
+	s := (*unsafeheader.Slice)(v.ptr)
+	if n < s.Len || n > s.Cap {
+		panic("reflect: slice capacity out of range in SetCap")
+	}
+	s.Cap = n
+}
+
+// SetMapIndex sets the element associated with key in the map v to elem.
+// It panics if v's Kind is not Map.
+// If elem is the zero Value, SetMapIndex deletes the key from the map.
+// Otherwise if v holds a nil map, SetMapIndex will panic.
+// As in Go, key's elem must be assignable to the map's key type,
+// and elem's value must be assignable to the map's elem type.
+func (v Value) SetMapIndex(key, elem Value) {
+	v.mustBe(Map)
+	v.mustBeExported()
+	key.mustBeExported()
+	tt := (*mapType)(unsafe.Pointer(v.typ))
+	key = key.assignTo("reflect.Value.SetMapIndex", tt.key, nil)
+	var k unsafe.Pointer
+	if key.flag&flagIndir != 0 {
+		k = key.ptr
+	} else {
+		k = unsafe.Pointer(&key.ptr)
+	}
+	if elem.typ == nil {
+		mapdelete(v.typ, v.pointer(), k)
+		return
+	}
+	elem.mustBeExported()
+	elem = elem.assignTo("reflect.Value.SetMapIndex", tt.elem, nil)
+	var e unsafe.Pointer
+	if elem.flag&flagIndir != 0 {
+		e = elem.ptr
+	} else {
+		e = unsafe.Pointer(&elem.ptr)
+	}
+	mapassign(v.typ, v.pointer(), k, e)
+}
+
+// SetUint sets v's underlying value to x.
+// It panics if v's Kind is not Uint, Uintptr, Uint8, Uint16, Uint32, or Uint64, or if CanSet() is false.
+func (v Value) SetUint(x uint64) {
+	v.mustBeAssignable()
+	switch k := v.kind(); k {
+	default:
+		panic(&ValueError{"reflect.Value.SetUint", v.kind()})
+	case Uint:
+		*(*uint)(v.ptr) = uint(x)
+	case Uint8:
+		*(*uint8)(v.ptr) = uint8(x)
+	case Uint16:
+		*(*uint16)(v.ptr) = uint16(x)
+	case Uint32:
+		*(*uint32)(v.ptr) = uint32(x)
+	case Uint64:
+		*(*uint64)(v.ptr) = x
+	case Uintptr:
+		*(*uintptr)(v.ptr) = uintptr(x)
+	}
+}
+
+// SetPointer sets the unsafe.Pointer value v to x.
+// It panics if v's Kind is not UnsafePointer.
+func (v Value) SetPointer(x unsafe.Pointer) {
+	v.mustBeAssignable()
+	v.mustBe(UnsafePointer)
+	*(*unsafe.Pointer)(v.ptr) = x
+}
+
+// SetString sets v's underlying value to x.
+// It panics if v's Kind is not String or if CanSet() is false.
+func (v Value) SetString(x string) {
+	v.mustBeAssignable()
+	v.mustBe(String)
+	*(*string)(v.ptr) = x
+}
+
+// Slice returns v[i:j].
+// It panics if v's Kind is not Array, Slice or String, or if v is an unaddressable array,
+// or if the indexes are out of bounds.
+func (v Value) Slice(i, j int) Value {
+	var (
+		cap  int
+		typ  *sliceType
+		base unsafe.Pointer
+	)
+	switch kind := v.kind(); kind {
+	default:
+		panic(&ValueError{"reflect.Value.Slice", v.kind()})
+
+	case Array:
+		if v.flag&flagAddr == 0 {
+			panic("reflect.Value.Slice: slice of unaddressable array")
+		}
+		tt := (*arrayType)(unsafe.Pointer(v.typ))
+		cap = int(tt.len)
+		typ = (*sliceType)(unsafe.Pointer(tt.slice))
+		base = v.ptr
+
+	case Slice:
+		typ = (*sliceType)(unsafe.Pointer(v.typ))
+		s := (*unsafeheader.Slice)(v.ptr)
+		base = s.Data
+		cap = s.Cap
+
+	case String:
+		s := (*unsafeheader.String)(v.ptr)
+		if i < 0 || j < i || j > s.Len {
+			panic("reflect.Value.Slice: string slice index out of bounds")
+		}
+		var t unsafeheader.String
+		if i < s.Len {
+			t = unsafeheader.String{Data: arrayAt(s.Data, i, 1, "i < s.Len"), Len: j - i}
+		}
+		return Value{v.typ, unsafe.Pointer(&t), v.flag}
+	}
+
+	if i < 0 || j < i || j > cap {
+		panic("reflect.Value.Slice: slice index out of bounds")
+	}
+
+	// Declare slice so that gc can see the base pointer in it.
+	var x []unsafe.Pointer
+
+	// Reinterpret as *unsafeheader.Slice to edit.
+	s := (*unsafeheader.Slice)(unsafe.Pointer(&x))
+	s.Len = j - i
+	s.Cap = cap - i
+	if cap-i > 0 {
+		s.Data = arrayAt(base, i, typ.elem.Size(), "i < cap")
+	} else {
+		// do not advance pointer, to avoid pointing beyond end of slice
+		s.Data = base
+	}
+
+	fl := v.flag.ro() | flagIndir | flag(Slice)
+	return Value{typ.common(), unsafe.Pointer(&x), fl}
+}
+
+// Slice3 is the 3-index form of the slice operation: it returns v[i:j:k].
+// It panics if v's Kind is not Array or Slice, or if v is an unaddressable array,
+// or if the indexes are out of bounds.
+func (v Value) Slice3(i, j, k int) Value {
+	var (
+		cap  int
+		typ  *sliceType
+		base unsafe.Pointer
+	)
+	switch kind := v.kind(); kind {
+	default:
+		panic(&ValueError{"reflect.Value.Slice3", v.kind()})
+
+	case Array:
+		if v.flag&flagAddr == 0 {
+			panic("reflect.Value.Slice3: slice of unaddressable array")
+		}
+		tt := (*arrayType)(unsafe.Pointer(v.typ))
+		cap = int(tt.len)
+		typ = (*sliceType)(unsafe.Pointer(tt.slice))
+		base = v.ptr
+
+	case Slice:
+		typ = (*sliceType)(unsafe.Pointer(v.typ))
+		s := (*unsafeheader.Slice)(v.ptr)
+		base = s.Data
+		cap = s.Cap
+	}
+
+	if i < 0 || j < i || k < j || k > cap {
+		panic("reflect.Value.Slice3: slice index out of bounds")
+	}
+
+	// Declare slice so that the garbage collector
+	// can see the base pointer in it.
+	var x []unsafe.Pointer
+
+	// Reinterpret as *unsafeheader.Slice to edit.
+	s := (*unsafeheader.Slice)(unsafe.Pointer(&x))
+	s.Len = j - i
+	s.Cap = k - i
+	if k-i > 0 {
+		s.Data = arrayAt(base, i, typ.elem.Size(), "i < k <= cap")
+	} else {
+		// do not advance pointer, to avoid pointing beyond end of slice
+		s.Data = base
+	}
+
+	fl := v.flag.ro() | flagIndir | flag(Slice)
+	return Value{typ.common(), unsafe.Pointer(&x), fl}
+}
+
+// String returns the string v's underlying value, as a string.
+// String is a special case because of Go's String method convention.
+// Unlike the other getters, it does not panic if v's Kind is not String.
+// Instead, it returns a string of the form "<T value>" where T is v's type.
+// The fmt package treats Values specially. It does not call their String
+// method implicitly but instead prints the concrete values they hold.
+func (v Value) String() string {
+	switch k := v.kind(); k {
+	case Invalid:
+		return "<invalid Value>"
+	case String:
+		return *(*string)(v.ptr)
+	}
+	// If you call String on a reflect.Value of other type, it's better to
+	// print something than to panic. Useful in debugging.
+	return "<" + v.Type().String() + " Value>"
+}
+
+// TryRecv attempts to receive a value from the channel v but will not block.
+// It panics if v's Kind is not Chan.
+// If the receive delivers a value, x is the transferred value and ok is true.
+// If the receive cannot finish without blocking, x is the zero Value and ok is false.
+// If the channel is closed, x is the zero value for the channel's element type and ok is false.
+func (v Value) TryRecv() (x Value, ok bool) {
+	v.mustBe(Chan)
+	v.mustBeExported()
+	return v.recv(true)
+}
+
+// TrySend attempts to send x on the channel v but will not block.
+// It panics if v's Kind is not Chan.
+// It reports whether the value was sent.
+// As in Go, x's value must be assignable to the channel's element type.
+func (v Value) TrySend(x Value) bool {
+	v.mustBe(Chan)
+	v.mustBeExported()
+	return v.send(x, true)
+}
+
+// Type returns v's type.
+func (v Value) Type() Type {
+	f := v.flag
+	if f == 0 {
+		panic(&ValueError{"reflect.Value.Type", Invalid})
+	}
+	if f&flagMethod == 0 {
+		// Easy case
+		return v.typ
+	}
+
+	// Method value.
+	// v.typ describes the receiver, not the method type.
+	i := int(v.flag) >> flagMethodShift
+	if v.typ.Kind() == Interface {
+		// Method on interface.
+		tt := (*interfaceType)(unsafe.Pointer(v.typ))
+		if uint(i) >= uint(len(tt.methods)) {
+			panic("reflect: internal error: invalid method index")
+		}
+		m := &tt.methods[i]
+		return v.typ.typeOff(m.typ)
+	}
+	// Method on concrete type.
+	ms := v.typ.exportedMethods()
+	if uint(i) >= uint(len(ms)) {
+		panic("reflect: internal error: invalid method index")
+	}
+	m := ms[i]
+	return v.typ.typeOff(m.mtyp)
+}
+
+// Uint returns v's underlying value, as a uint64.
+// It panics if v's Kind is not Uint, Uintptr, Uint8, Uint16, Uint32, or Uint64.
+func (v Value) Uint() uint64 {
+	k := v.kind()
+	p := v.ptr
+	switch k {
+	case Uint:
+		return uint64(*(*uint)(p))
+	case Uint8:
+		return uint64(*(*uint8)(p))
+	case Uint16:
+		return uint64(*(*uint16)(p))
+	case Uint32:
+		return uint64(*(*uint32)(p))
+	case Uint64:
+		return *(*uint64)(p)
+	case Uintptr:
+		return uint64(*(*uintptr)(p))
+	}
+	panic(&ValueError{"reflect.Value.Uint", v.kind()})
+}
+
+//go:nocheckptr
+// This prevents inlining Value.UnsafeAddr when -d=checkptr is enabled,
+// which ensures cmd/compile can recognize unsafe.Pointer(v.UnsafeAddr())
+// and make an exception.
+
+// UnsafeAddr returns a pointer to v's data.
+// It is for advanced clients that also import the "unsafe" package.
+// It panics if v is not addressable.
+func (v Value) UnsafeAddr() uintptr {
+	// TODO: deprecate
+	if v.typ == nil {
+		panic(&ValueError{"reflect.Value.UnsafeAddr", Invalid})
+	}
+	if v.flag&flagAddr == 0 {
+		panic("reflect.Value.UnsafeAddr of unaddressable value")
+	}
+	return uintptr(v.ptr)
+}
+
+// StringHeader is the runtime representation of a string.
+// It cannot be used safely or portably and its representation may
+// change in a later release.
+// Moreover, the Data field is not sufficient to guarantee the data
+// it references will not be garbage collected, so programs must keep
+// a separate, correctly typed pointer to the underlying data.
+type StringHeader struct {
+	Data uintptr
+	Len  int
+}
+
+// SliceHeader is the runtime representation of a slice.
+// It cannot be used safely or portably and its representation may
+// change in a later release.
+// Moreover, the Data field is not sufficient to guarantee the data
+// it references will not be garbage collected, so programs must keep
+// a separate, correctly typed pointer to the underlying data.
+type SliceHeader struct {
+	Data uintptr
+	Len  int
+	Cap  int
+}
+
+func typesMustMatch(what string, t1, t2 Type) {
+	if t1 != t2 {
+		panic(what + ": " + t1.String() + " != " + t2.String())
+	}
+}
+
+// arrayAt returns the i-th element of p,
+// an array whose elements are eltSize bytes wide.
+// The array pointed at by p must have at least i+1 elements:
+// it is invalid (but impossible to check here) to pass i >= len,
+// because then the result will point outside the array.
+// whySafe must explain why i < len. (Passing "i < len" is fine;
+// the benefit is to surface this assumption at the call site.)
+func arrayAt(p unsafe.Pointer, i int, eltSize uintptr, whySafe string) unsafe.Pointer {
+	return add(p, uintptr(i)*eltSize, "i < len")
+}
+
+// grow grows the slice s so that it can hold extra more values, allocating
+// more capacity if needed. It also returns the old and new slice lengths.
+func grow(s Value, extra int) (Value, int, int) {
+	i0 := s.Len()
+	i1 := i0 + extra
+	if i1 < i0 {
+		panic("reflect.Append: slice overflow")
+	}
+	m := s.Cap()
+	if i1 <= m {
+		return s.Slice(0, i1), i0, i1
+	}
+	if m == 0 {
+		m = extra
+	} else {
+		for m < i1 {
+			if i0 < 1024 {
+				m += m
+			} else {
+				m += m / 4
+			}
+		}
+	}
+	t := MakeSlice(s.Type(), i1, m)
+	Copy(t, s)
+	return t, i0, i1
+}
+
+// Append appends the values x to a slice s and returns the resulting slice.
+// As in Go, each x's value must be assignable to the slice's element type.
+func Append(s Value, x ...Value) Value {
+	s.mustBe(Slice)
+	s, i0, i1 := grow(s, len(x))
+	for i, j := i0, 0; i < i1; i, j = i+1, j+1 {
+		s.Index(i).Set(x[j])
+	}
+	return s
+}
+
+// AppendSlice appends a slice t to a slice s and returns the resulting slice.
+// The slices s and t must have the same element type.
+func AppendSlice(s, t Value) Value {
+	s.mustBe(Slice)
+	t.mustBe(Slice)
+	typesMustMatch("reflect.AppendSlice", s.Type().Elem(), t.Type().Elem())
+	s, i0, i1 := grow(s, t.Len())
+	Copy(s.Slice(i0, i1), t)
+	return s
+}
+
+// Copy copies the contents of src into dst until either
+// dst has been filled or src has been exhausted.
+// It returns the number of elements copied.
+// Dst and src each must have kind Slice or Array, and
+// dst and src must have the same element type.
+//
+// As a special case, src can have kind String if the element type of dst is kind Uint8.
+func Copy(dst, src Value) int {
+	dk := dst.kind()
+	if dk != Array && dk != Slice {
+		panic(&ValueError{"reflect.Copy", dk})
+	}
+	if dk == Array {
+		dst.mustBeAssignable()
+	}
+	dst.mustBeExported()
+
+	sk := src.kind()
+	var stringCopy bool
+	if sk != Array && sk != Slice {
+		stringCopy = sk == String && dst.typ.Elem().Kind() == Uint8
+		if !stringCopy {
+			panic(&ValueError{"reflect.Copy", sk})
+		}
+	}
+	src.mustBeExported()
+
+	de := dst.typ.Elem()
+	if !stringCopy {
+		se := src.typ.Elem()
+		typesMustMatch("reflect.Copy", de, se)
+	}
+
+	var ds, ss unsafeheader.Slice
+	if dk == Array {
+		ds.Data = dst.ptr
+		ds.Len = dst.Len()
+		ds.Cap = ds.Len
+	} else {
+		ds = *(*unsafeheader.Slice)(dst.ptr)
+	}
+	if sk == Array {
+		ss.Data = src.ptr
+		ss.Len = src.Len()
+		ss.Cap = ss.Len
+	} else if sk == Slice {
+		ss = *(*unsafeheader.Slice)(src.ptr)
+	} else {
+		sh := *(*unsafeheader.String)(src.ptr)
+		ss.Data = sh.Data
+		ss.Len = sh.Len
+		ss.Cap = sh.Len
+	}
+
+	return typedslicecopy(de.common(), ds, ss)
+}
+
+// A runtimeSelect is a single case passed to rselect.
+// This must match ../runtime/select.go:/runtimeSelect
+type runtimeSelect struct {
+	dir SelectDir      // SelectSend, SelectRecv or SelectDefault
+	typ *rtype         // channel type
+	ch  unsafe.Pointer // channel
+	val unsafe.Pointer // ptr to data (SendDir) or ptr to receive buffer (RecvDir)
+}
+
+// rselect runs a select. It returns the index of the chosen case.
+// If the case was a receive, val is filled in with the received value.
+// The conventional OK bool indicates whether the receive corresponds
+// to a sent value.
+//go:noescape
+func rselect([]runtimeSelect) (chosen int, recvOK bool)
+
+// A SelectDir describes the communication direction of a select case.
+type SelectDir int
+
+// NOTE: These values must match ../runtime/select.go:/selectDir.
+
+const (
+	_             SelectDir = iota
+	SelectSend              // case Chan <- Send
+	SelectRecv              // case <-Chan:
+	SelectDefault           // default
+)
+
+// A SelectCase describes a single case in a select operation.
+// The kind of case depends on Dir, the communication direction.
+//
+// If Dir is SelectDefault, the case represents a default case.
+// Chan and Send must be zero Values.
+//
+// If Dir is SelectSend, the case represents a send operation.
+// Normally Chan's underlying value must be a channel, and Send's underlying value must be
+// assignable to the channel's element type. As a special case, if Chan is a zero Value,
+// then the case is ignored, and the field Send will also be ignored and may be either zero
+// or non-zero.
+//
+// If Dir is SelectRecv, the case represents a receive operation.
+// Normally Chan's underlying value must be a channel and Send must be a zero Value.
+// If Chan is a zero Value, then the case is ignored, but Send must still be a zero Value.
+// When a receive operation is selected, the received Value is returned by Select.
+//
+type SelectCase struct {
+	Dir  SelectDir // direction of case
+	Chan Value     // channel to use (for send or receive)
+	Send Value     // value to send (for send)
+}
+
+// Select executes a select operation described by the list of cases.
+// Like the Go select statement, it blocks until at least one of the cases
+// can proceed, makes a uniform pseudo-random choice,
+// and then executes that case. It returns the index of the chosen case
+// and, if that case was a receive operation, the value received and a
+// boolean indicating whether the value corresponds to a send on the channel
+// (as opposed to a zero value received because the channel is closed).
+// Select supports a maximum of 65536 cases.
+func Select(cases []SelectCase) (chosen int, recv Value, recvOK bool) {
+	if len(cases) > 65536 {
+		panic("reflect.Select: too many cases (max 65536)")
+	}
+	// NOTE: Do not trust that caller is not modifying cases data underfoot.
+	// The range is safe because the caller cannot modify our copy of the len
+	// and each iteration makes its own copy of the value c.
+	var runcases []runtimeSelect
+	if len(cases) > 4 {
+		// Slice is heap allocated due to runtime dependent capacity.
+		runcases = make([]runtimeSelect, len(cases))
+	} else {
+		// Slice can be stack allocated due to constant capacity.
+		runcases = make([]runtimeSelect, len(cases), 4)
+	}
+
+	haveDefault := false
+	for i, c := range cases {
+		rc := &runcases[i]
+		rc.dir = c.Dir
+		switch c.Dir {
+		default:
+			panic("reflect.Select: invalid Dir")
+
+		case SelectDefault: // default
+			if haveDefault {
+				panic("reflect.Select: multiple default cases")
+			}
+			haveDefault = true
+			if c.Chan.IsValid() {
+				panic("reflect.Select: default case has Chan value")
+			}
+			if c.Send.IsValid() {
+				panic("reflect.Select: default case has Send value")
+			}
+
+		case SelectSend:
+			ch := c.Chan
+			if !ch.IsValid() {
+				break
+			}
+			ch.mustBe(Chan)
+			ch.mustBeExported()
+			tt := (*chanType)(unsafe.Pointer(ch.typ))
+			if ChanDir(tt.dir)&SendDir == 0 {
+				panic("reflect.Select: SendDir case using recv-only channel")
+			}
+			rc.ch = ch.pointer()
+			rc.typ = &tt.rtype
+			v := c.Send
+			if !v.IsValid() {
+				panic("reflect.Select: SendDir case missing Send value")
+			}
+			v.mustBeExported()
+			v = v.assignTo("reflect.Select", tt.elem, nil)
+			if v.flag&flagIndir != 0 {
+				rc.val = v.ptr
+			} else {
+				rc.val = unsafe.Pointer(&v.ptr)
+			}
+
+		case SelectRecv:
+			if c.Send.IsValid() {
+				panic("reflect.Select: RecvDir case has Send value")
+			}
+			ch := c.Chan
+			if !ch.IsValid() {
+				break
+			}
+			ch.mustBe(Chan)
+			ch.mustBeExported()
+			tt := (*chanType)(unsafe.Pointer(ch.typ))
+			if ChanDir(tt.dir)&RecvDir == 0 {
+				panic("reflect.Select: RecvDir case using send-only channel")
+			}
+			rc.ch = ch.pointer()
+			rc.typ = &tt.rtype
+			rc.val = unsafe_New(tt.elem)
+		}
+	}
+
+	chosen, recvOK = rselect(runcases)
+	if runcases[chosen].dir == SelectRecv {
+		tt := (*chanType)(unsafe.Pointer(runcases[chosen].typ))
+		t := tt.elem
+		p := runcases[chosen].val
+		fl := flag(t.Kind())
+		if ifaceIndir(t) {
+			recv = Value{t, p, fl | flagIndir}
+		} else {
+			recv = Value{t, *(*unsafe.Pointer)(p), fl}
+		}
+	}
+	return chosen, recv, recvOK
+}
+
+/*
+ * constructors
+ */
+
+// implemented in package runtime
+func unsafe_New(*rtype) unsafe.Pointer
+func unsafe_NewArray(*rtype, int) unsafe.Pointer
+
+// MakeSlice creates a new zero-initialized slice value
+// for the specified slice type, length, and capacity.
+func MakeSlice(typ Type, len, cap int) Value {
+	if typ.Kind() != Slice {
+		panic("reflect.MakeSlice of non-slice type")
+	}
+	if len < 0 {
+		panic("reflect.MakeSlice: negative len")
+	}
+	if cap < 0 {
+		panic("reflect.MakeSlice: negative cap")
+	}
+	if len > cap {
+		panic("reflect.MakeSlice: len > cap")
+	}
+
+	s := unsafeheader.Slice{Data: unsafe_NewArray(typ.Elem().(*rtype), cap), Len: len, Cap: cap}
+	return Value{typ.(*rtype), unsafe.Pointer(&s), flagIndir | flag(Slice)}
+}
+
+// MakeChan creates a new channel with the specified type and buffer size.
+func MakeChan(typ Type, buffer int) Value {
+	if typ.Kind() != Chan {
+		panic("reflect.MakeChan of non-chan type")
+	}
+	if buffer < 0 {
+		panic("reflect.MakeChan: negative buffer size")
+	}
+	if typ.ChanDir() != BothDir {
+		panic("reflect.MakeChan: unidirectional channel type")
+	}
+	t := typ.(*rtype)
+	ch := makechan(t, buffer)
+	return Value{t, ch, flag(Chan)}
+}
+
+// MakeMap creates a new map with the specified type.
+func MakeMap(typ Type) Value {
+	return MakeMapWithSize(typ, 0)
+}
+
+// MakeMapWithSize creates a new map with the specified type
+// and initial space for approximately n elements.
+func MakeMapWithSize(typ Type, n int) Value {
+	if typ.Kind() != Map {
+		panic("reflect.MakeMapWithSize of non-map type")
+	}
+	t := typ.(*rtype)
+	m := makemap(t, n)
+	return Value{t, m, flag(Map)}
+}
+
+// Indirect returns the value that v points to.
+// If v is a nil pointer, Indirect returns a zero Value.
+// If v is not a pointer, Indirect returns v.
+func Indirect(v Value) Value {
+	if v.Kind() != Ptr {
+		return v
+	}
+	return v.Elem()
+}
+
+// ValueOf returns a new Value initialized to the concrete value
+// stored in the interface i. ValueOf(nil) returns the zero Value.
+func ValueOf(i interface{}) Value {
+	if i == nil {
+		return Value{}
+	}
+
+	// TODO: Maybe allow contents of a Value to live on the stack.
+	// For now we make the contents always escape to the heap. It
+	// makes life easier in a few places (see chanrecv/mapassign
+	// comment below).
+	escapes(i)
+
+	return unpackEface(i)
+}
+
+// Zero returns a Value representing the zero value for the specified type.
+// The result is different from the zero value of the Value struct,
+// which represents no value at all.
+// For example, Zero(TypeOf(42)) returns a Value with Kind Int and value 0.
+// The returned value is neither addressable nor settable.
+func Zero(typ Type) Value {
+	if typ == nil {
+		panic("reflect: Zero(nil)")
+	}
+	t := typ.(*rtype)
+	fl := flag(t.Kind())
+	if ifaceIndir(t) {
+		var p unsafe.Pointer
+		if t.size <= maxZero {
+			p = unsafe.Pointer(&zeroVal[0])
+		} else {
+			p = unsafe_New(t)
+		}
+		return Value{t, p, fl | flagIndir}
+	}
+	return Value{t, nil, fl}
+}
+
+// must match declarations in runtime/map.go.
+const maxZero = 1024
+
+//go:linkname zeroVal runtime.zeroVal
+var zeroVal [maxZero]byte
+
+// New returns a Value representing a pointer to a new zero value
+// for the specified type. That is, the returned Value's Type is PtrTo(typ).
+func New(typ Type) Value {
+	if typ == nil {
+		panic("reflect: New(nil)")
+	}
+	t := typ.(*rtype)
+	ptr := unsafe_New(t)
+	fl := flag(Ptr)
+	return Value{t.ptrTo(), ptr, fl}
+}
+
+// NewAt returns a Value representing a pointer to a value of the
+// specified type, using p as that pointer.
+func NewAt(typ Type, p unsafe.Pointer) Value {
+	fl := flag(Ptr)
+	t := typ.(*rtype)
+	return Value{t.ptrTo(), p, fl}
+}
+
+// assignTo returns a value v that can be assigned directly to typ.
+// It panics if v is not assignable to typ.
+// For a conversion to an interface type, target is a suggested scratch space to use.
+// target must be initialized memory (or nil).
+func (v Value) assignTo(context string, dst *rtype, target unsafe.Pointer) Value {
+	if v.flag&flagMethod != 0 {
+		v = makeMethodValue(context, v)
+	}
+
+	switch {
+	case directlyAssignable(dst, v.typ):
+		// Overwrite type so that they match.
+		// Same memory layout, so no harm done.
+		fl := v.flag&(flagAddr|flagIndir) | v.flag.ro()
+		fl |= flag(dst.Kind())
+		return Value{dst, v.ptr, fl}
+
+	case implements(dst, v.typ):
+		if target == nil {
+			target = unsafe_New(dst)
+		}
+		if v.Kind() == Interface && v.IsNil() {
+			// A nil ReadWriter passed to nil Reader is OK,
+			// but using ifaceE2I below will panic.
+			// Avoid the panic by returning a nil dst (e.g., Reader) explicitly.
+			return Value{dst, nil, flag(Interface)}
+		}
+		x := valueInterface(v, false)
+		if dst.NumMethod() == 0 {
+			*(*interface{})(target) = x
+		} else {
+			ifaceE2I(dst, x, target)
+		}
+		return Value{dst, target, flagIndir | flag(Interface)}
+	}
+
+	// Failed.
+	panic(context + ": value of type " + v.typ.String() + " is not assignable to type " + dst.String())
+}
+
+// Convert returns the value v converted to type t.
+// If the usual Go conversion rules do not allow conversion
+// of the value v to type t, Convert panics.
+func (v Value) Convert(t Type) Value {
+	if v.flag&flagMethod != 0 {
+		v = makeMethodValue("Convert", v)
+	}
+	op := convertOp(t.common(), v.typ)
+	if op == nil {
+		panic("reflect.Value.Convert: value of type " + v.typ.String() + " cannot be converted to type " + t.String())
+	}
+	return op(v, t)
+}
+
+// convertOp returns the function to convert a value of type src
+// to a value of type dst. If the conversion is illegal, convertOp returns nil.
+func convertOp(dst, src *rtype) func(Value, Type) Value {
+	switch src.Kind() {
+	case Int, Int8, Int16, Int32, Int64:
+		switch dst.Kind() {
+		case Int, Int8, Int16, Int32, Int64, Uint, Uint8, Uint16, Uint32, Uint64, Uintptr:
+			return cvtInt
+		case Float32, Float64:
+			return cvtIntFloat
+		case String:
+			return cvtIntString
+		}
+
+	case Uint, Uint8, Uint16, Uint32, Uint64, Uintptr:
+		switch dst.Kind() {
+		case Int, Int8, Int16, Int32, Int64, Uint, Uint8, Uint16, Uint32, Uint64, Uintptr:
+			return cvtUint
+		case Float32, Float64:
+			return cvtUintFloat
+		case String:
+			return cvtUintString
+		}
+
+	case Float32, Float64:
+		switch dst.Kind() {
+		case Int, Int8, Int16, Int32, Int64:
+			return cvtFloatInt
+		case Uint, Uint8, Uint16, Uint32, Uint64, Uintptr:
+			return cvtFloatUint
+		case Float32, Float64:
+			return cvtFloat
+		}
+
+	case Complex64, Complex128:
+		switch dst.Kind() {
+		case Complex64, Complex128:
+			return cvtComplex
+		}
+
+	case String:
+		if dst.Kind() == Slice && dst.Elem().PkgPath() == "" {
+			switch dst.Elem().Kind() {
+			case Uint8:
+				return cvtStringBytes
+			case Int32:
+				return cvtStringRunes
+			}
+		}
+
+	case Slice:
+		if dst.Kind() == String && src.Elem().PkgPath() == "" {
+			switch src.Elem().Kind() {
+			case Uint8:
+				return cvtBytesString
+			case Int32:
+				return cvtRunesString
+			}
+		}
+
+	case Chan:
+		if dst.Kind() == Chan && specialChannelAssignability(dst, src) {
+			return cvtDirect
+		}
+	}
+
+	// dst and src have same underlying type.
+	if haveIdenticalUnderlyingType(dst, src, false) {
+		return cvtDirect
+	}
+
+	// dst and src are non-defined pointer types with same underlying base type.
+	if dst.Kind() == Ptr && dst.Name() == "" &&
+		src.Kind() == Ptr && src.Name() == "" &&
+		haveIdenticalUnderlyingType(dst.Elem().common(), src.Elem().common(), false) {
+		return cvtDirect
+	}
+
+	if implements(dst, src) {
+		if src.Kind() == Interface {
+			return cvtI2I
+		}
+		return cvtT2I
+	}
+
+	return nil
+}
+
+// makeInt returns a Value of type t equal to bits (possibly truncated),
+// where t is a signed or unsigned int type.
+func makeInt(f flag, bits uint64, t Type) Value {
+	typ := t.common()
+	ptr := unsafe_New(typ)
+	switch typ.size {
+	case 1:
+		*(*uint8)(ptr) = uint8(bits)
+	case 2:
+		*(*uint16)(ptr) = uint16(bits)
+	case 4:
+		*(*uint32)(ptr) = uint32(bits)
+	case 8:
+		*(*uint64)(ptr) = bits
+	}
+	return Value{typ, ptr, f | flagIndir | flag(typ.Kind())}
+}
+
+// makeFloat returns a Value of type t equal to v (possibly truncated to float32),
+// where t is a float32 or float64 type.
+func makeFloat(f flag, v float64, t Type) Value {
+	typ := t.common()
+	ptr := unsafe_New(typ)
+	switch typ.size {
+	case 4:
+		*(*float32)(ptr) = float32(v)
+	case 8:
+		*(*float64)(ptr) = v
+	}
+	return Value{typ, ptr, f | flagIndir | flag(typ.Kind())}
+}
+
+// makeFloat returns a Value of type t equal to v, where t is a float32 type.
+func makeFloat32(f flag, v float32, t Type) Value {
+	typ := t.common()
+	ptr := unsafe_New(typ)
+	*(*float32)(ptr) = v
+	return Value{typ, ptr, f | flagIndir | flag(typ.Kind())}
+}
+
+// makeComplex returns a Value of type t equal to v (possibly truncated to complex64),
+// where t is a complex64 or complex128 type.
+func makeComplex(f flag, v complex128, t Type) Value {
+	typ := t.common()
+	ptr := unsafe_New(typ)
+	switch typ.size {
+	case 8:
+		*(*complex64)(ptr) = complex64(v)
+	case 16:
+		*(*complex128)(ptr) = v
+	}
+	return Value{typ, ptr, f | flagIndir | flag(typ.Kind())}
+}
+
+func makeString(f flag, v string, t Type) Value {
+	ret := New(t).Elem()
+	ret.SetString(v)
+	ret.flag = ret.flag&^flagAddr | f
+	return ret
+}
+
+func makeBytes(f flag, v []byte, t Type) Value {
+	ret := New(t).Elem()
+	ret.SetBytes(v)
+	ret.flag = ret.flag&^flagAddr | f
+	return ret
+}
+
+func makeRunes(f flag, v []rune, t Type) Value {
+	ret := New(t).Elem()
+	ret.setRunes(v)
+	ret.flag = ret.flag&^flagAddr | f
+	return ret
+}
+
+// These conversion functions are returned by convertOp
+// for classes of conversions. For example, the first function, cvtInt,
+// takes any value v of signed int type and returns the value converted
+// to type t, where t is any signed or unsigned int type.
+
+// convertOp: intXX -> [u]intXX
+func cvtInt(v Value, t Type) Value {
+	return makeInt(v.flag.ro(), uint64(v.Int()), t)
+}
+
+// convertOp: uintXX -> [u]intXX
+func cvtUint(v Value, t Type) Value {
+	return makeInt(v.flag.ro(), v.Uint(), t)
+}
+
+// convertOp: floatXX -> intXX
+func cvtFloatInt(v Value, t Type) Value {
+	return makeInt(v.flag.ro(), uint64(int64(v.Float())), t)
+}
+
+// convertOp: floatXX -> uintXX
+func cvtFloatUint(v Value, t Type) Value {
+	return makeInt(v.flag.ro(), uint64(v.Float()), t)
+}
+
+// convertOp: intXX -> floatXX
+func cvtIntFloat(v Value, t Type) Value {
+	return makeFloat(v.flag.ro(), float64(v.Int()), t)
+}
+
+// convertOp: uintXX -> floatXX
+func cvtUintFloat(v Value, t Type) Value {
+	return makeFloat(v.flag.ro(), float64(v.Uint()), t)
+}
+
+// convertOp: floatXX -> floatXX
+func cvtFloat(v Value, t Type) Value {
+	if v.Type().Kind() == Float32 && t.Kind() == Float32 {
+		// Don't do any conversion if both types have underlying type float32.
+		// This avoids converting to float64 and back, which will
+		// convert a signaling NaN to a quiet NaN. See issue 36400.
+		return makeFloat32(v.flag.ro(), *(*float32)(v.ptr), t)
+	}
+	return makeFloat(v.flag.ro(), v.Float(), t)
+}
+
+// convertOp: complexXX -> complexXX
+func cvtComplex(v Value, t Type) Value {
+	return makeComplex(v.flag.ro(), v.Complex(), t)
+}
+
+// convertOp: intXX -> string
+func cvtIntString(v Value, t Type) Value {
+	s := "\uFFFD"
+	if x := v.Int(); int64(rune(x)) == x {
+		s = string(rune(x))
+	}
+	return makeString(v.flag.ro(), s, t)
+}
+
+// convertOp: uintXX -> string
+func cvtUintString(v Value, t Type) Value {
+	s := "\uFFFD"
+	if x := v.Uint(); uint64(rune(x)) == x {
+		s = string(rune(x))
+	}
+	return makeString(v.flag.ro(), s, t)
+}
+
+// convertOp: []byte -> string
+func cvtBytesString(v Value, t Type) Value {
+	return makeString(v.flag.ro(), string(v.Bytes()), t)
+}
+
+// convertOp: string -> []byte
+func cvtStringBytes(v Value, t Type) Value {
+	return makeBytes(v.flag.ro(), []byte(v.String()), t)
+}
+
+// convertOp: []rune -> string
+func cvtRunesString(v Value, t Type) Value {
+	return makeString(v.flag.ro(), string(v.runes()), t)
+}
+
+// convertOp: string -> []rune
+func cvtStringRunes(v Value, t Type) Value {
+	return makeRunes(v.flag.ro(), []rune(v.String()), t)
+}
+
+// convertOp: direct copy
+func cvtDirect(v Value, typ Type) Value {
+	f := v.flag
+	t := typ.common()
+	ptr := v.ptr
+	if f&flagAddr != 0 {
+		// indirect, mutable word - make a copy
+		c := unsafe_New(t)
+		typedmemmove(t, c, ptr)
+		ptr = c
+		f &^= flagAddr
+	}
+	return Value{t, ptr, v.flag.ro() | f} // v.flag.ro()|f == f?
+}
+
+// convertOp: concrete -> interface
+func cvtT2I(v Value, typ Type) Value {
+	target := unsafe_New(typ.common())
+	x := valueInterface(v, false)
+	if typ.NumMethod() == 0 {
+		*(*interface{})(target) = x
+	} else {
+		ifaceE2I(typ.(*rtype), x, target)
+	}
+	return Value{typ.common(), target, v.flag.ro() | flagIndir | flag(Interface)}
+}
+
+// convertOp: interface -> interface
+func cvtI2I(v Value, typ Type) Value {
+	if v.IsNil() {
+		ret := Zero(typ)
+		ret.flag |= v.flag.ro()
+		return ret
+	}
+	return cvtT2I(v.Elem(), typ)
+}
+
+// implemented in ../runtime
+func chancap(ch unsafe.Pointer) int
+func chanclose(ch unsafe.Pointer)
+func chanlen(ch unsafe.Pointer) int
+
+// Note: some of the noescape annotations below are technically a lie,
+// but safe in the context of this package. Functions like chansend
+// and mapassign don't escape the referent, but may escape anything
+// the referent points to (they do shallow copies of the referent).
+// It is safe in this package because the referent may only point
+// to something a Value may point to, and that is always in the heap
+// (due to the escapes() call in ValueOf).
+
+//go:noescape
+func chanrecv(ch unsafe.Pointer, nb bool, val unsafe.Pointer) (selected, received bool)
+
+//go:noescape
+func chansend(ch unsafe.Pointer, val unsafe.Pointer, nb bool) bool
+
+func makechan(typ *rtype, size int) (ch unsafe.Pointer)
+func makemap(t *rtype, cap int) (m unsafe.Pointer)
+
+//go:noescape
+func mapaccess(t *rtype, m unsafe.Pointer, key unsafe.Pointer) (val unsafe.Pointer)
+
+//go:noescape
+func mapassign(t *rtype, m unsafe.Pointer, key, val unsafe.Pointer)
+
+//go:noescape
+func mapdelete(t *rtype, m unsafe.Pointer, key unsafe.Pointer)
+
+// m escapes into the return value, but the caller of mapiterinit
+// doesn't let the return value escape.
+//go:noescape
+func mapiterinit(t *rtype, m unsafe.Pointer) unsafe.Pointer
+
+//go:noescape
+func mapiterkey(it unsafe.Pointer) (key unsafe.Pointer)
+
+//go:noescape
+func mapiterelem(it unsafe.Pointer) (elem unsafe.Pointer)
+
+//go:noescape
+func mapiternext(it unsafe.Pointer)
+
+//go:noescape
+func maplen(m unsafe.Pointer) int
+
+// call calls fn with a copy of the n argument bytes pointed at by arg.
+// After fn returns, reflectcall copies n-retoffset result bytes
+// back into arg+retoffset before returning. If copying result bytes back,
+// the caller must pass the argument frame type as argtype, so that
+// call can execute appropriate write barriers during the copy.
+//
+//go:linkname call runtime.reflectcall
+func call(argtype *rtype, fn, arg unsafe.Pointer, n uint32, retoffset uint32)
+
+func ifaceE2I(t *rtype, src interface{}, dst unsafe.Pointer)
+
+// memmove copies size bytes to dst from src. No write barriers are used.
+//go:noescape
+func memmove(dst, src unsafe.Pointer, size uintptr)
+
+// typedmemmove copies a value of type t to dst from src.
+//go:noescape
+func typedmemmove(t *rtype, dst, src unsafe.Pointer)
+
+// typedmemmovepartial is like typedmemmove but assumes that
+// dst and src point off bytes into the value and only copies size bytes.
+//go:noescape
+func typedmemmovepartial(t *rtype, dst, src unsafe.Pointer, off, size uintptr)
+
+// typedmemclr zeros the value at ptr of type t.
+//go:noescape
+func typedmemclr(t *rtype, ptr unsafe.Pointer)
+
+// typedmemclrpartial is like typedmemclr but assumes that
+// dst points off bytes into the value and only clears size bytes.
+//go:noescape
+func typedmemclrpartial(t *rtype, ptr unsafe.Pointer, off, size uintptr)
+
+// typedslicecopy copies a slice of elemType values from src to dst,
+// returning the number of elements copied.
+//go:noescape
+func typedslicecopy(elemType *rtype, dst, src unsafeheader.Slice) int
+
+//go:noescape
+func typehash(t *rtype, p unsafe.Pointer, h uintptr) uintptr
+
+// Dummy annotation marking that the value x escapes,
+// for use in cases where the reflect code is so clever that
+// the compiler cannot follow.
+func escapes(x interface{}) {
+	if dummy.b {
+		dummy.x = x
+	}
+}
+
+var dummy struct {
+	b bool
+	x interface{}
+}