reflect: add stub reflect package

This is necessary to compile fmt. However, it cannot link yet.

src/reflect/swapper.go

@@ -0,0 +1,5 @@
+package reflect
+
+func Swapper(slice interface{}) func(i, j int) {
+	panic("unimplemented: reflect.Swapper")
+}

src/reflect/type.go

@@ -0,0 +1,70 @@
+package reflect
+
+// A Kind is the number that the compiler uses for this type.
+//
+// Not used directly. These types are all replaced with the number the compiler
+// uses internally for the type.
+type Kind uint16
+
+// Copied from reflect/type.go
+// https://golang.org/src/reflect/type.go?s=8302:8316#L217
+const (
+	Invalid Kind = iota
+	Bool
+	Int
+	Int8
+	Int16
+	Int32
+	Int64
+	Uint
+	Uint8
+	Uint16
+	Uint32
+	Uint64
+	Uintptr
+	Float32
+	Float64
+	Complex64
+	Complex128
+	Array
+	Chan
+	Func
+	Interface
+	Map
+	Ptr
+	Slice
+	String
+	Struct
+	UnsafePointer
+)
+
+// The typecode as used in an interface{}.
+type Type uint16
+
+func TypeOf(i interface{}) Type {
+	return ValueOf(i).typecode
+}
+
+func (t Type) String() string {
+	return "T"
+}
+
+func (t Type) Kind() Kind {
+	return Invalid // TODO
+}
+
+func (t Type) Elem() Type {
+	panic("unimplemented: (reflect.Type).Elem()")
+}
+
+func (t Type) Field(i int) StructField {
+	panic("unimplemented: (reflect.Type).Field()")
+}
+
+func (t Type) Bits() int {
+	panic("unimplemented: (reflect.Type).Bits()")
+}
+
+type StructField struct {
+	Name string
+}

src/reflect/value.go

@@ -0,0 +1,144 @@
+package reflect
+
+import (
+	_ "unsafe" // for go:linkname
+)
+
+// This is the same thing as an interface{}.
+type Value struct {
+	typecode Type
+	value    *uint8
+}
+
+func ValueOf(i interface{}) Value
+
+//go:linkname _ValueOf reflect.ValueOf
+func _ValueOf(i Value) Value {
+	return i
+}
+
+func (v Value) Interface() interface{}
+
+func (v Value) Type() Type {
+	return v.typecode
+}
+
+func (v Value) Kind() Kind {
+	return Invalid // TODO
+}
+
+func (v Value) IsNil() bool {
+	panic("unimplemented: (reflect.Value).IsNil()")
+}
+
+func (v Value) Pointer() uintptr {
+	panic("unimplemented: (reflect.Value).Pointer()")
+}
+
+func (v Value) IsValid() bool {
+	panic("unimplemented: (reflect.Value).IsValid()")
+}
+
+func (v Value) CanInterface() bool {
+	panic("unimplemented: (reflect.Value).CanInterface()")
+}
+
+func (v Value) CanAddr() bool {
+	panic("unimplemented: (reflect.Value).CanAddr()")
+}
+
+func (v Value) Addr() Value {
+	panic("unimplemented: (reflect.Value).Addr()")
+}
+
+func (v Value) Bool() bool {
+	panic("unimplemented: (reflect.Value).Bool()")
+}
+
+func (v Value) Int() int64 {
+	panic("unimplemented: (reflect.Value).Int()")
+}
+
+func (v Value) Uint() uint64 {
+	panic("unimplemented: (reflect.Value).Uint()")
+}
+
+func (v Value) Float() float64 {
+	panic("unimplemented: (reflect.Value).Float()")
+}
+
+func (v Value) Complex() complex128 {
+	panic("unimplemented: (reflect.Value).Complex()")
+}
+
+func (v Value) String() string {
+	panic("unimplemented: (reflect.Value).String()")
+}
+
+func (v Value) Bytes() []byte {
+	panic("unimplemented: (reflect.Value).Bytes()")
+}
+
+func (v Value) Slice(i, j int) Value {
+	panic("unimplemented: (reflect.Value).Slice()")
+}
+
+func (v Value) Len() int {
+	panic("unimplemented: (reflect.Value).Len()")
+}
+
+func (v Value) NumField() int {
+	panic("unimplemented: (reflect.Value).NumField()")
+}
+
+func (v Value) Elem() Value {
+	panic("unimplemented: (reflect.Value).Elem()")
+}
+
+func (v Value) Field(i int) Value {
+	panic("unimplemented: (reflect.Value).Field()")
+}
+
+func (v Value) Index(i int) Value {
+	panic("unimplemented: (reflect.Value).Index()")
+}
+
+func (v Value) MapKeys() []Value {
+	panic("unimplemented: (reflect.Value).MapKeys()")
+}
+
+func (v Value) MapIndex(key Value) Value {
+	panic("unimplemented: (reflect.Value).MapIndex()")
+}
+
+func (v Value) Set(x Value) {
+	panic("unimplemented: (reflect.Value).Set()")
+}
+
+func (v Value) SetBool(x bool) {
+	panic("unimplemented: (reflect.Value).SetBool()")
+}
+
+func (v Value) SetInt(x int64) {
+	panic("unimplemented: (reflect.Value).SetInt()")
+}
+
+func (v Value) SetUint(x uint64) {
+	panic("unimplemented: (reflect.Value).SetUint()")
+}
+
+func (v Value) SetFloat(x float64) {
+	panic("unimplemented: (reflect.Value).SetFloat()")
+}
+
+func (v Value) SetComplex(x complex128) {
+	panic("unimplemented: (reflect.Value).SetComplex()")
+}
+
+func (v Value) SetString(x string) {
+	panic("unimplemented: (reflect.Value).SetString()")
+}
+
+func MakeSlice(typ Type, len, cap int) Value {
+	panic("unimplemented: reflect.MakeSlice()")
+}