mirror of
https://github.com/golang/go
synced 2024-10-03 06:21:21 -06:00
gob: use new reflect
R=r DELTA=242 (68 added, 69 deleted, 105 changed) OCL=31239 CL=31289
This commit is contained in:
Russ Cox
parent
e37f81b49c
commit
877839333e
@ -278,7 +278,7 @@ type decEngine struct {
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instr []decInstr
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}
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func decodeStruct(engine *decEngine, rtyp reflect.StructType, r io.Reader, p uintptr, indir int) os.Error {
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func decodeStruct(engine *decEngine, rtyp *reflect.StructType, r io.Reader, p uintptr, indir int) os.Error {
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if indir > 0 {
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up := unsafe.Pointer(p);
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if *(*unsafe.Pointer)(up) == nil {
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@ -317,7 +317,7 @@ func decodeStruct(engine *decEngine, rtyp reflect.StructType, r io.Reader, p uin
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return state.err
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}
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func decodeArrayHelper(state *DecState, p uintptr, elemOp decOp, elemWid, length, elemIndir int) os.Error {
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func decodeArrayHelper(state *DecState, p uintptr, elemOp decOp, elemWid uintptr, length, elemIndir int) os.Error {
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instr := &decInstr{elemOp, 0, elemIndir, 0};
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for i := 0; i < length && state.err == nil; i++ {
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up := unsafe.Pointer(p);
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@ -330,7 +330,7 @@ func decodeArrayHelper(state *DecState, p uintptr, elemOp decOp, elemWid, length
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return state.err
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}
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func decodeArray(atyp reflect.ArrayType, state *DecState, p uintptr, elemOp decOp, elemWid, length, indir, elemIndir int) os.Error {
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func decodeArray(atyp *reflect.ArrayType, state *DecState, p uintptr, elemOp decOp, elemWid uintptr, length, indir, elemIndir int) os.Error {
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if indir > 0 {
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up := unsafe.Pointer(p);
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if *(*unsafe.Pointer)(up) == nil {
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@ -341,14 +341,14 @@ func decodeArray(atyp reflect.ArrayType, state *DecState, p uintptr, elemOp decO
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}
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p = *(*uintptr)(up);
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}
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if DecodeUint(state) != uint64(length) {
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if n := DecodeUint(state); n != uint64(length) {
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return os.ErrorString("length mismatch in decodeArray");
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}
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return decodeArrayHelper(state, p, elemOp, elemWid, length, elemIndir);
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}
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func decodeSlice(atyp reflect.ArrayType, state *DecState, p uintptr, elemOp decOp, elemWid, indir, elemIndir int) os.Error {
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length := int(DecodeUint(state));
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func decodeSlice(atyp *reflect.SliceType, state *DecState, p uintptr, elemOp decOp, elemWid uintptr, indir, elemIndir int) os.Error {
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length := uintptr(DecodeUint(state));
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if indir > 0 {
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up := unsafe.Pointer(p);
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if *(*unsafe.Pointer)(up) == nil {
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@ -364,59 +364,58 @@ func decodeSlice(atyp reflect.ArrayType, state *DecState, p uintptr, elemOp decO
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hdrp.Data = uintptr(unsafe.Pointer(&data[0]));
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hdrp.Len = uint32(length);
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hdrp.Cap = uint32(length);
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return decodeArrayHelper(state, hdrp.Data, elemOp, elemWid, length, elemIndir);
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return decodeArrayHelper(state, hdrp.Data, elemOp, elemWid, int(length), elemIndir);
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}
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var decEngineMap = make(map[reflect.Type] *decEngine)
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var decOpMap = map[int] decOp {
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reflect.BoolKind: decBool,
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reflect.IntKind: decInt,
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reflect.Int8Kind: decInt8,
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reflect.Int16Kind: decInt16,
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reflect.Int32Kind: decInt32,
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reflect.Int64Kind: decInt64,
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reflect.UintKind: decUint,
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reflect.Uint8Kind: decUint8,
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reflect.Uint16Kind: decUint16,
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reflect.Uint32Kind: decUint32,
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reflect.Uint64Kind: decUint64,
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reflect.FloatKind: decFloat,
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reflect.Float32Kind: decFloat32,
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reflect.Float64Kind: decFloat64,
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reflect.StringKind: decString,
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var decOpMap = map[reflect.Type] decOp {
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reflect.Typeof((*reflect.BoolType)(nil)): decBool,
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reflect.Typeof((*reflect.IntType)(nil)): decInt,
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reflect.Typeof((*reflect.Int8Type)(nil)): decInt8,
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reflect.Typeof((*reflect.Int16Type)(nil)): decInt16,
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reflect.Typeof((*reflect.Int32Type)(nil)): decInt32,
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reflect.Typeof((*reflect.Int64Type)(nil)): decInt64,
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reflect.Typeof((*reflect.UintType)(nil)): decUint,
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reflect.Typeof((*reflect.Uint8Type)(nil)): decUint8,
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reflect.Typeof((*reflect.Uint16Type)(nil)): decUint16,
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reflect.Typeof((*reflect.Uint32Type)(nil)): decUint32,
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reflect.Typeof((*reflect.Uint64Type)(nil)): decUint64,
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reflect.Typeof((*reflect.FloatType)(nil)): decFloat,
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reflect.Typeof((*reflect.Float32Type)(nil)): decFloat32,
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reflect.Typeof((*reflect.Float64Type)(nil)): decFloat64,
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reflect.Typeof((*reflect.StringType)(nil)): decString,
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}
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func getDecEngine(rt reflect.Type) *decEngine
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func decOpFor(typ reflect.Type) decOp {
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op, ok := decOpMap[typ.Kind()];
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op, ok := decOpMap[reflect.Typeof(typ)];
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if !ok {
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// Special cases
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if typ.Kind() == reflect.ArrayKind {
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atyp := typ.(reflect.ArrayType);
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switch {
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case atyp.Elem().Kind() == reflect.Uint8Kind:
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op = decUint8Array
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case atyp.IsSlice():
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elemOp := decOpFor(atyp.Elem());
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_, elemIndir := indirect(atyp.Elem());
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op = func(i *decInstr, state *DecState, p unsafe.Pointer) {
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state.err = decodeSlice(atyp, state, uintptr(p), elemOp, atyp.Elem().Size(), i.indir, elemIndir);
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};
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case !atyp.IsSlice():
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elemOp := decOpFor(atyp.Elem());
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_, elemIndir := indirect(atyp.Elem());
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op = func(i *decInstr, state *DecState, p unsafe.Pointer) {
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state.err = decodeArray(atyp, state, uintptr(p), elemOp, atyp.Elem().Size(), atyp.Len(), i.indir, elemIndir);
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};
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switch t := typ.(type) {
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case *reflect.SliceType:
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if _, ok := t.Elem().(*reflect.Uint8Type); ok {
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op = decUint8Array;
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break;
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}
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}
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if typ.Kind() == reflect.StructKind {
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elemOp := decOpFor(t.Elem());
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_, elemIndir := indirect(t.Elem());
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op = func(i *decInstr, state *DecState, p unsafe.Pointer) {
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state.err = decodeSlice(t, state, uintptr(p), elemOp, t.Elem().Size(), i.indir, elemIndir);
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};
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case *reflect.ArrayType:
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elemOp := decOpFor(t.Elem());
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_, elemIndir := indirect(t.Elem());
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op = func(i *decInstr, state *DecState, p unsafe.Pointer) {
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state.err = decodeArray(t, state, uintptr(p), elemOp, t.Elem().Size(), t.Len(), i.indir, elemIndir);
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};
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case *reflect.StructType:
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// Generate a closure that calls out to the engine for the nested type.
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engine := getDecEngine(typ);
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styp := typ.(reflect.StructType);
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op = func(i *decInstr, state *DecState, p unsafe.Pointer) {
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state.err = decodeStruct(engine, styp, state.r, uintptr(p), i.indir)
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state.err = decodeStruct(engine, t, state.r, uintptr(p), i.indir)
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};
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}
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}
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@ -427,7 +426,7 @@ func decOpFor(typ reflect.Type) decOp {
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}
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func compileDec(rt reflect.Type, typ Type) *decEngine {
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srt, ok1 := rt.(reflect.StructType);
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srt, ok1 := rt.(*reflect.StructType);
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styp, ok2 := typ.(*structType);
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if !ok1 || !ok2 {
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panicln("TODO: can't handle non-structs");
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@ -438,19 +437,10 @@ func compileDec(rt reflect.Type, typ Type) *decEngine {
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field := styp.field[fieldnum];
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// TODO(r): verify compatibility with corresponding field of data.
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// For now, assume perfect correspondence between struct and gob.
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_name, ftyp, _tag, offset := srt.Field(fieldnum);
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// How many indirections to the underlying data?
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indir := 0;
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for {
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pt, ok := ftyp.(reflect.PtrType);
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if !ok {
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break
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}
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ftyp = pt.Sub();
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indir++;
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}
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f := srt.Field(fieldnum);
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ftyp, indir := indirect(f.Type);
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op := decOpFor(ftyp);
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engine.instr[fieldnum] = decInstr{op, fieldnum, indir, uintptr(offset)};
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engine.instr[fieldnum] = decInstr{op, fieldnum, indir, uintptr(f.Offset)};
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}
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return engine;
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}
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@ -459,7 +449,8 @@ func compileDec(rt reflect.Type, typ Type) *decEngine {
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func getDecEngine(rt reflect.Type) *decEngine {
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engine, ok := decEngineMap[rt];
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if !ok {
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return compileDec(rt, newType(rt.Name(), rt));
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pkg, name := rt.Name();
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engine = compileDec(rt, newType(name, rt));
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decEngineMap[rt] = engine;
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}
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return engine;
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@ -472,11 +463,11 @@ func Decode(r io.Reader, e interface{}) os.Error {
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for i := 0; i < indir; i++ {
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v = reflect.Indirect(v);
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}
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if rt.Kind() != reflect.StructKind {
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if _, ok := v.(*reflect.StructValue); !ok {
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return os.ErrorString("decode can't handle " + rt.String())
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}
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typeLock.Lock();
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engine := getDecEngine(rt);
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typeLock.Unlock();
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return decodeStruct(engine, rt.(reflect.StructType), r, uintptr(v.Addr()), 0);
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return decodeStruct(engine, rt.(*reflect.StructType), r, uintptr(v.Addr()), 0);
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}
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@ -14,21 +14,6 @@ import (
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"unsafe";
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)
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// Step through the indirections on a type to discover the base type.
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// Return the number of indirections.
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func indirect(t reflect.Type) (rt reflect.Type, count int) {
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rt = t;
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for {
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pt, ok := rt.(reflect.PtrType);
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if !ok {
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break
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}
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rt = pt.Sub();
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count++;
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}
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return;
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}
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// The global execution state of an instance of the encoder.
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// Field numbers are delta encoded and always increase. The field
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// number is initialized to -1 so 0 comes out as delta(1). A delta of
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@ -295,7 +280,7 @@ func encodeStruct(engine *encEngine, w io.Writer, basep uintptr) os.Error {
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return state.err
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}
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func encodeArray(w io.Writer, p uintptr, op encOp, elemWid int, length int, elemIndir int) os.Error {
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func encodeArray(w io.Writer, p uintptr, op encOp, elemWid uintptr, length int, elemIndir int) os.Error {
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state := new(EncState);
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state.w = w;
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state.fieldnum = -1;
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@ -316,58 +301,56 @@ func encodeArray(w io.Writer, p uintptr, op encOp, elemWid int, length int, elem
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}
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var encEngineMap = make(map[reflect.Type] *encEngine)
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var encOpMap = map[int] encOp {
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reflect.BoolKind: encBool,
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reflect.IntKind: encInt,
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reflect.Int8Kind: encInt8,
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reflect.Int16Kind: encInt16,
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reflect.Int32Kind: encInt32,
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reflect.Int64Kind: encInt64,
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reflect.UintKind: encUint,
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reflect.Uint8Kind: encUint8,
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reflect.Uint16Kind: encUint16,
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reflect.Uint32Kind: encUint32,
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reflect.Uint64Kind: encUint64,
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reflect.FloatKind: encFloat,
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reflect.Float32Kind: encFloat32,
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reflect.Float64Kind: encFloat64,
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reflect.StringKind: encString,
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var encOpMap = map[reflect.Type] encOp {
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reflect.Typeof((*reflect.BoolType)(nil)): encBool,
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reflect.Typeof((*reflect.IntType)(nil)): encInt,
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reflect.Typeof((*reflect.Int8Type)(nil)): encInt8,
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reflect.Typeof((*reflect.Int16Type)(nil)): encInt16,
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reflect.Typeof((*reflect.Int32Type)(nil)): encInt32,
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reflect.Typeof((*reflect.Int64Type)(nil)): encInt64,
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reflect.Typeof((*reflect.UintType)(nil)): encUint,
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reflect.Typeof((*reflect.Uint8Type)(nil)): encUint8,
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reflect.Typeof((*reflect.Uint16Type)(nil)): encUint16,
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reflect.Typeof((*reflect.Uint32Type)(nil)): encUint32,
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reflect.Typeof((*reflect.Uint64Type)(nil)): encUint64,
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reflect.Typeof((*reflect.FloatType)(nil)): encFloat,
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reflect.Typeof((*reflect.Float32Type)(nil)): encFloat32,
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reflect.Typeof((*reflect.Float64Type)(nil)): encFloat64,
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reflect.Typeof((*reflect.StringType)(nil)): encString,
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}
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func getEncEngine(rt reflect.Type) *encEngine
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func encOpFor(typ reflect.Type) encOp {
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op, ok := encOpMap[typ.Kind()];
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op, ok := encOpMap[reflect.Typeof(typ)];
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if !ok {
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// Special cases
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if typ.Kind() == reflect.ArrayKind {
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atyp := typ.(reflect.ArrayType);
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switch {
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case atyp.Elem().Kind() == reflect.Uint8Kind:
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op = encUint8Array
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case atyp.IsSlice():
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// Slices have a header; we decode it to find the underlying array.
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elemOp := encOpFor(atyp.Elem());
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_, indir := indirect(atyp.Elem());
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op = func(i *encInstr, state *EncState, p unsafe.Pointer) {
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slice := *(*reflect.SliceHeader)(p);
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if slice.Len == 0 {
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return
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}
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state.update(i);
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state.err = encodeArray(state.w, slice.Data, elemOp, atyp.Elem().Size(), int(slice.Len), indir);
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};
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case !atyp.IsSlice():
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// True arrays have size in the type.
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elemOp := encOpFor(atyp.Elem());
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_, indir := indirect(atyp.Elem());
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op = func(i *encInstr, state *EncState, p unsafe.Pointer) {
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state.update(i);
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state.err = encodeArray(state.w, uintptr(p), elemOp, atyp.Elem().Size(), atyp.Len(), indir);
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};
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switch t := typ.(type) {
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case *reflect.SliceType:
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if _, ok := t.Elem().(*reflect.Uint8Type); ok {
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op = encUint8Array;
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break;
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}
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}
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if typ.Kind() == reflect.StructKind {
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// Slices have a header; we decode it to find the underlying array.
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elemOp := encOpFor(t.Elem());
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_, indir := indirect(t.Elem());
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op = func(i *encInstr, state *EncState, p unsafe.Pointer) {
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slice := (*reflect.SliceHeader)(p);
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if slice.Len == 0 {
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return
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}
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state.update(i);
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state.err = encodeArray(state.w, slice.Data, elemOp, t.Elem().Size(), int(slice.Len), indir);
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};
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case *reflect.ArrayType:
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// True arrays have size in the type.
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elemOp := encOpFor(t.Elem());
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_, indir := indirect(t.Elem());
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op = func(i *encInstr, state *EncState, p unsafe.Pointer) {
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state.update(i);
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state.err = encodeArray(state.w, uintptr(p), elemOp, t.Elem().Size(), t.Len(), indir);
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};
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case *reflect.StructType:
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// Generate a closure that calls out to the engine for the nested type.
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engine := getEncEngine(typ);
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op = func(i *encInstr, state *EncState, p unsafe.Pointer) {
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@ -386,28 +369,19 @@ func encOpFor(typ reflect.Type) encOp {
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// it's compatible.
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// TODO(r): worth checking? typ is unused here.
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func compileEnc(rt reflect.Type, typ Type) *encEngine {
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srt, ok := rt.(reflect.StructType);
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srt, ok := rt.(*reflect.StructType);
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if !ok {
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panicln("TODO: can't handle non-structs");
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}
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engine := new(encEngine);
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engine.instr = make([]encInstr, srt.Len()+1); // +1 for terminator
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for fieldnum := 0; fieldnum < srt.Len(); fieldnum++ {
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_name, ftyp, _tag, offset := srt.Field(fieldnum);
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// How many indirections to the underlying data?
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indir := 0;
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for {
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pt, ok := ftyp.(reflect.PtrType);
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if !ok {
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break
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}
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ftyp = pt.Sub();
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indir++;
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}
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engine.instr = make([]encInstr, srt.NumField()+1); // +1 for terminator
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for fieldnum := 0; fieldnum < srt.NumField(); fieldnum++ {
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f := srt.Field(fieldnum);
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ftyp, indir := indirect(f.Type);
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op := encOpFor(ftyp);
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engine.instr[fieldnum] = encInstr{op, fieldnum, indir, uintptr(offset)};
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engine.instr[fieldnum] = encInstr{op, fieldnum, indir, uintptr(f.Offset)};
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}
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engine.instr[srt.Len()] = encInstr{encStructTerminator, 0, 0, 0};
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engine.instr[srt.NumField()] = encInstr{encStructTerminator, 0, 0, 0};
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return engine;
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}
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@ -415,7 +389,8 @@ func compileEnc(rt reflect.Type, typ Type) *encEngine {
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func getEncEngine(rt reflect.Type) *encEngine {
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engine, ok := encEngineMap[rt];
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if !ok {
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engine = compileEnc(rt, newType(rt.Name(), rt));
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pkg, name := rt.Name();
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engine = compileEnc(rt, newType(name, rt));
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encEngineMap[rt] = engine;
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}
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return engine
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@ -428,11 +403,11 @@ func Encode(w io.Writer, e interface{}) os.Error {
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for i := 0; i < indir; i++ {
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v = reflect.Indirect(v);
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}
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if v.Kind() != reflect.StructKind {
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if _, ok := v.(*reflect.StructValue); !ok {
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return os.ErrorString("encode can't handle " + v.Type().String())
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}
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typeLock.Lock();
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engine := getEncEngine(rt);
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typeLock.Unlock();
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return encodeStruct(engine, w, uintptr(v.(reflect.StructValue).Addr()));
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return encodeStruct(engine, w, v.Addr());
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}
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@ -141,50 +141,79 @@ func newStructType(name string) *structType {
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// Construction
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func newType(name string, rt reflect.Type) Type
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func newTypeObject(name string, rt reflect.Type) Type {
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switch rt.Kind() {
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// All basic types are easy: they are predefined.
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case reflect.BoolKind:
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return tBool
|
||||
case reflect.IntKind, reflect.Int32Kind, reflect.Int64Kind:
|
||||
return tInt
|
||||
case reflect.UintKind, reflect.Uint32Kind, reflect.Uint64Kind:
|
||||
return tUint
|
||||
case reflect.FloatKind, reflect.Float32Kind, reflect.Float64Kind:
|
||||
return tFloat
|
||||
case reflect.StringKind:
|
||||
return tString
|
||||
case reflect.ArrayKind:
|
||||
at := rt.(reflect.ArrayType);
|
||||
if at.IsSlice() {
|
||||
// []byte == []uint8 is a special case
|
||||
if at.Elem().Kind() == reflect.Uint8Kind {
|
||||
return tBytes
|
||||
}
|
||||
return newSliceType(name, newType("", at.Elem()));
|
||||
} else {
|
||||
return newArrayType(name, newType("", at.Elem()), at.Len());
|
||||
// Step through the indirections on a type to discover the base type.
|
||||
// Return the number of indirections.
|
||||
func indirect(t reflect.Type) (rt reflect.Type, count int) {
|
||||
rt = t;
|
||||
for {
|
||||
pt, ok := rt.(*reflect.PtrType);
|
||||
if !ok {
|
||||
break;
|
||||
}
|
||||
case reflect.StructKind:
|
||||
rt = pt.Elem();
|
||||
count++;
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
func newTypeObject(name string, rt reflect.Type) Type {
|
||||
switch t := rt.(type) {
|
||||
// All basic types are easy: they are predefined.
|
||||
case *reflect.BoolType:
|
||||
return tBool
|
||||
|
||||
case *reflect.IntType:
|
||||
return tInt
|
||||
case *reflect.Int32Type:
|
||||
return tInt
|
||||
case *reflect.Int64Type:
|
||||
return tInt
|
||||
|
||||
case *reflect.UintType:
|
||||
return tUint
|
||||
case *reflect.Uint32Type:
|
||||
return tUint
|
||||
case *reflect.Uint64Type:
|
||||
return tUint
|
||||
|
||||
case *reflect.FloatType:
|
||||
return tFloat
|
||||
case *reflect.Float32Type:
|
||||
return tFloat
|
||||
case *reflect.Float64Type:
|
||||
return tFloat
|
||||
|
||||
case *reflect.StringType:
|
||||
return tString
|
||||
|
||||
case *reflect.ArrayType:
|
||||
return newArrayType(name, newType("", t.Elem()), t.Len());
|
||||
|
||||
case *reflect.SliceType:
|
||||
// []byte == []uint8 is a special case
|
||||
if _, ok := t.Elem().(*reflect.Uint8Type); ok {
|
||||
return tBytes
|
||||
}
|
||||
return newSliceType(name, newType("", t.Elem()));
|
||||
|
||||
case *reflect.StructType:
|
||||
// Install the struct type itself before the fields so recursive
|
||||
// structures can be constructed safely.
|
||||
strType := newStructType(name);
|
||||
types[rt] = strType;
|
||||
st := rt.(reflect.StructType);
|
||||
field := make([]*fieldType, st.Len());
|
||||
for i := 0; i < st.Len(); i++ {
|
||||
name, typ, _tag, _offset := st.Field(i);
|
||||
// Find trailing name in type, e.g. from "*gob.Bar" want "Bar", which
|
||||
// is defined as the word after the period (there is at most one period).
|
||||
typestring := typ.String();
|
||||
period := strings.Index(typestring, ".");
|
||||
if period >= 0 {
|
||||
typestring = typestring[period+1:len(typestring)]
|
||||
field := make([]*fieldType, t.NumField());
|
||||
for i := 0; i < t.NumField(); i++ {
|
||||
f := t.Field(i);
|
||||
typ, _indir := indirect(f.Type);
|
||||
_pkg, tname := typ.Name();
|
||||
if tname == "" {
|
||||
tname = f.Type.String();
|
||||
}
|
||||
field[i] = &fieldType{ name, newType(typestring, typ) };
|
||||
field[i] = &fieldType{ f.Name, newType(tname, f.Type) };
|
||||
}
|
||||
strType.field = field;
|
||||
return strType;
|
||||
|
||||
default:
|
||||
panicln("gob NewTypeObject can't handle type", rt.String()); // TODO(r): panic?
|
||||
}
|
||||
@ -193,8 +222,12 @@ func newTypeObject(name string, rt reflect.Type) Type {
|
||||
|
||||
func newType(name string, rt reflect.Type) Type {
|
||||
// Flatten the data structure by collapsing out pointers
|
||||
for rt.Kind() == reflect.PtrKind {
|
||||
rt = rt.(reflect.PtrType).Sub();
|
||||
for {
|
||||
pt, ok := rt.(*reflect.PtrType);
|
||||
if !ok {
|
||||
break;
|
||||
}
|
||||
rt = pt.Elem();
|
||||
}
|
||||
typ, present := types[rt];
|
||||
if present {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user