reflection type structure. no parsing etc. yet.

main is a simple tester outside the Makefile.

R=rsc
DELTA=455  (455 added, 0 deleted, 0 changed)
OCL=17235
CL=17242

usr/r/reflect/Makefile

+# 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.
+
+# DO NOT EDIT.  Automatically generated by gobuild.
+# gobuild -m reflect print.go type.go
+O=6
+GC=$(O)g
+CC=$(O)c -w
+AS=$(O)a
+AR=$(O)ar
+
+PKG=$(GOROOT)/pkg/reflect.a
+
+install: $(PKG)
+
+nuke: clean
+	rm -f $(PKG)
+
+clean:
+	rm -f *.$O *.a
+
+%.$O: %.go
+	$(GC) $*.go
+
+%.$O: %.c
+	$(CC) $*.c
+
+%.$O: %.s
+	$(AS) $*.s
+
+
+O1=\
+	type.$O\
+
+O2=\
+	print.$O\
+
+$(PKG): a1 a2
+a1:	$(O1)
+	$(AR) grc $(PKG) $(O1)
+a2:	$(O2)
+	$(AR) grc $(PKG) $(O2)
+
+$(O1): nuke
+$(O2): a1
+

usr/r/reflect/main.go

+// 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 main
+
+import (
+	"reflect"
+)
+
+func main() {
+	reflect.Print(reflect.Int8); print("\n");
+	reflect.Print(reflect.Int16); print("\n");
+	reflect.Print(reflect.Int32); print("\n");
+	reflect.Print(reflect.Int64); print("\n");
+	reflect.Print(reflect.Uint8); print("\n");
+	reflect.Print(reflect.Uint16); print("\n");
+	reflect.Print(reflect.Uint32); print("\n");
+	reflect.Print(reflect.Uint64); print("\n");
+	reflect.Print(reflect.Float32); print("\n");
+	reflect.Print(reflect.Float64); print("\n");
+	reflect.Print(reflect.Float80); print("\n");
+	reflect.Print(reflect.String); print("\n");
+
+	reflect.Print(reflect.PtrInt8); print("\n");
+	reflect.Print(reflect.ArrayFloat32); print("\n");
+	reflect.Print(reflect.MapStringInt16); print("\n");
+	reflect.Print(reflect.ChanArray); print("\n");
+	reflect.Print(reflect.Structure); print("\n");
+	reflect.Print(reflect.Function); print("\n");
+}

usr/r/reflect/print.go

+// 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 (
+	"reflect"
+)
+
+// Implemented as a function rather than a method to keep the
+// Type interface small.  TODO: should this return a string?
+export func Print(typ Type) {
+	switch(typ.Kind()) {
+	case Int8Kind:
+		print("int8");
+	case Int16Kind:
+		print("int16");
+	case Int32Kind:
+		print("int32");
+	case Int64Kind:
+		print("int64");
+	case Uint8Kind:
+		print("uint8");
+	case Uint16Kind:
+		print("uint16");
+	case Uint32Kind:
+		print("uint32");
+	case Uint64Kind:
+		print("uint64");
+	case Float32Kind:
+		print("float32");
+	case Float64Kind:
+		print("float64");
+	case Float80Kind:
+		print("float80");
+	case StringKind:
+		print("string");
+	case PtrKind:
+		p := typ.(PtrType);
+		print("*");
+		Print(p.Sub());
+	case ArrayKind:
+		a := typ.(ArrayType);
+		if a.Len() >= 0 {
+			print("[", a.Len(), "]")
+		} else {
+			print("[]")
+		}
+		Print(a.Elem());
+	case MapKind:
+		m := typ.(MapType);
+		print("map[");
+		Print(m.Key());
+		print("]");
+		Print(m.Elem());
+	case ChanKind:
+		c := typ.(ChanType);
+		switch c.Dir() {
+		case RecvDir:
+			print("<-chan");
+		case SendDir:
+			print("chan<-");
+		case BothDir:
+			print("chan");
+		default:
+			panicln("reflect.Print: unknown chan direction");
+		}
+		Print(c.Elem());
+	case StructKind:
+		s := typ.(StructType);
+		print("struct{");
+		for i := 0; i < s.Len(); i++ {
+			n, t := s.Field(i);
+			print(n, " ");
+			Print(t);
+			if i < s.Len() - 1 {
+				print("; ");
+			}
+		}
+		print("}");
+	case FuncKind:
+		f := typ.(FuncType);
+		print("func ");
+		if f.Receiver() != nil {
+			print("(");
+			Print(f.Receiver());
+			print(")");
+		}
+		print("(");
+		Print(f.In());
+		print(")");
+		if f.Out() != nil {
+			print("(");
+			Print(f.Out());
+			print(")");
+		}
+	default:
+		panicln("can't print type ", typ.Kind());
+	}
+}

usr/r/reflect/type.go

+// 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
+
+export type Type interface
+export type Value interface{}	// TODO: define this
+
+export func LookupTypeName(name string) Type
+
+//export var GlobalTypeStrings = sys.typestrings;
+
+// Cache of types keyed by type name
+var types = new(map[string] *Type)	// BUG TODO: should be Type not *Type
+// Cache of type strings keyed by type name
+var strings = new(map[string] string)
+
+export const (
+	ArrayKind = iota;
+	ChanKind;
+	Float32Kind;
+	Float64Kind;
+	Float80Kind;
+	FuncKind;
+	Int16Kind;
+	Int32Kind;
+	Int64Kind;
+	Int8Kind;
+	MapKind;
+	PtrKind;
+	StringKind;
+	StructKind;
+	Uint16Kind;
+	Uint32Kind;
+	Uint64Kind;
+	Uint8Kind;
+)
+
+type Type interface {
+	Kind()	int;
+}
+
+type BasicType struct{
+	kind	int
+}
+
+func (t *BasicType) Kind() int {
+	return t.kind
+}
+
+func NewBasicType(k int) Type {
+	t := new(BasicType);
+	t.kind = k;
+	return t;
+}
+
+// Basic types
+export var (
+	Int8 = NewBasicType(Int8Kind);
+	Int16 = NewBasicType(Int16Kind);
+	Int32 = NewBasicType(Int32Kind);
+	Int64 = NewBasicType(Int64Kind);
+	Uint8 = NewBasicType(Uint8Kind);
+	Uint16 = NewBasicType(Uint16Kind);
+	Uint32 = NewBasicType(Uint32Kind);
+	Uint64 = NewBasicType(Uint64Kind);
+	Float32 = NewBasicType(Float32Kind);
+	Float64 = NewBasicType(Float64Kind);
+	Float80 = NewBasicType(Float80Kind);
+	String = NewBasicType(StringKind);
+)
+
+type StubType struct {
+	name	string;
+	typ		Type;
+}
+
+func (t *StubType) Get() Type {
+	if t.typ == nil {
+		t.typ = LookupTypeName(t.name)
+	}
+	return t.typ
+}
+
+export type PtrType interface {
+	Sub()	Type
+}
+
+type PtrTypeStruct struct {
+	sub	*StubType
+}
+
+func (t *PtrTypeStruct) Kind() int {
+	return PtrKind
+}
+
+func (t *PtrTypeStruct) Sub() Type {
+	return t.sub.Get()
+}
+
+func NewPtrTypeStruct(sub *StubType) *PtrTypeStruct {
+	t := new(PtrTypeStruct);
+	t.sub = sub;
+	return t;
+}
+
+export type ArrayType interface {
+	Len()	int;
+	Elem()	Type;
+}
+
+type ArrayTypeStruct struct {
+	elem	*StubType;
+	len	int;
+}
+
+func (t *ArrayTypeStruct) Kind() int {
+	return ArrayKind
+}
+
+func (t *ArrayTypeStruct) Len() int {
+	// -1 is open array?  TODO
+	return t.len
+}
+
+func (t *ArrayTypeStruct) Elem() Type {
+	return t.elem.Get()
+}
+
+func NewArrayTypeStruct(len int, elem *StubType) *ArrayTypeStruct {
+	t := new(ArrayTypeStruct);
+	t.len = len;
+	t.elem = elem;
+	return t;
+}
+
+export type MapType interface {
+	Key()	Type;
+	Elem()	Type;
+}
+
+type MapTypeStruct struct {
+	key	*StubType;
+	elem	*StubType;
+}
+
+func (t *MapTypeStruct) Kind() int {
+	return MapKind
+}
+
+func (t *MapTypeStruct) Key() Type {
+	return t.key.Get()
+}
+
+func (t *MapTypeStruct) Elem() Type {
+	return t.elem.Get()
+}
+
+func NewMapTypeStruct(key, elem *StubType) *MapTypeStruct {
+	t := new(MapTypeStruct);
+	t.key = key;
+	t.elem = elem;
+	return t;
+}
+
+export type ChanType interface {
+	Dir()	int;
+	Elem()	Type;
+}
+
+export const (	// channel direction
+	SendDir = 1 << iota;
+	RecvDir;
+	BothDir = SendDir | RecvDir;
+)
+
+type ChanTypeStruct struct {
+	elem	*StubType;
+	dir	int;
+}
+
+func (t *ChanTypeStruct) Kind() int {
+	return ChanKind
+}
+
+func (t *ChanTypeStruct) Dir() int {
+	// -1 is open array?  TODO
+	return t.dir
+}
+
+func (t *ChanTypeStruct) Elem() Type {
+	return t.elem.Get()
+}
+
+func NewChanTypeStruct(dir int, elem *StubType) *ChanTypeStruct {
+	t := new(ChanTypeStruct);
+	t.dir = dir;
+	t.elem = elem;
+	return t;
+}
+
+export type StructType interface {
+	Field(int)	(name string, typ Type);
+	Len()	int;
+}
+
+type Field struct {
+	name	string;
+	typ	*StubType;
+}
+
+type StructTypeStruct struct {
+	field	*[]Field;
+}
+
+func (t *StructTypeStruct) Kind() int {
+	return StructKind
+}
+
+func (t *StructTypeStruct) Field(i int) (name string, typ Type) {
+	return t.field[i].name, t.field[i].typ.Get()
+}
+
+func (t *StructTypeStruct) Len() int {
+	return len(t.field)
+}
+
+func Struct(field *[]Field) *StructTypeStruct {
+	t := new(StructTypeStruct);
+	t.field = field;
+	return t;
+}
+
+func NewStructTypeStruct(field *[]Field) *StructTypeStruct {
+	t := new(StructTypeStruct);
+	t.field = field;
+	return t;
+}
+
+export type FuncType interface {
+	Receiver()	StructType;
+	In()	StructType;
+	Out()	StructType;
+}
+
+type FuncTypeStruct struct {
+	receiver	*StructTypeStruct;
+	in	*StructTypeStruct;
+	out	*StructTypeStruct;
+}
+
+func (t *FuncTypeStruct) Kind() int {
+	return FuncKind
+}
+
+func (t *FuncTypeStruct) Receiver() StructType {
+	return t.receiver
+}
+
+func (t *FuncTypeStruct) In() StructType {
+	return t.in
+}
+
+func (t *FuncTypeStruct) Out() StructType {
+	return t.out
+}
+
+func NewFuncTypeStruct(receiver, in, out *StructTypeStruct) *FuncTypeStruct {
+	t := new(FuncTypeStruct);
+	t.receiver = receiver;
+	t.in = in;
+	t.out = out;
+	return t;
+}
+
+//helpers for early bootstrap and debugging
+export func LookupTypeName(name string) Type { return Int8 }
+func Stub(n string, t Type) *StubType {
+	s := new(StubType);
+	s.name = n;
+	s.typ = t;
+	return s;
+}
+export var PtrInt8 Type = NewPtrTypeStruct(Stub("i", Int8));
+export var ArrayFloat32 Type = NewArrayTypeStruct(100, Stub("f", Float32));
+export var MapStringInt16 Type = NewMapTypeStruct(Stub("s", String), Stub("i", Int16));
+export var ChanArray Type = NewChanTypeStruct(RecvDir, Stub("a", ArrayFloat32));
+var F1 = Field{"i", Stub("i", Int64)};
+var Fields = []Field{F1};
+export var Structure = NewStructTypeStruct(&Fields);
+export var Function Type = NewFuncTypeStruct(Structure, Structure, Structure);