mirror of
https://github.com/golang/go
synced 2024-11-25 13:17:56 -07:00
arrays, not slices, and only with non-pointer elements.
(actually slices encode but do not decode yet) R=rsc DELTA=221 (82 added, 65 deleted, 74 changed) OCL=31095 CL=31095
This commit is contained in:
Rob Pike
parent
29e6eb21ec
commit
0c33d4353e
@ -125,11 +125,6 @@ func newEncState(b *bytes.Buffer) *EncState {
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return state;
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}
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func encAddrOf(state *EncState, instr *encInstr) unsafe.Pointer {
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p := unsafe.Pointer(state.base+instr.offset);
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return encIndirect(p, instr.indir);
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}
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// Test instruction execution for encoding.
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// Do not run the machine yet; instead do individual instructions crafted by hand.
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func TestScalarEncInstructions(t *testing.T) {
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@ -140,8 +135,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a bool } { true };
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instr := &encInstr{ encBool, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(boolResult, b.Data()) {
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t.Errorf("bool enc instructions: expected % x got % x", boolResult, b.Data())
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}
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@ -153,8 +147,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a int } { 17 };
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instr := &encInstr{ encInt, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(signedResult, b.Data()) {
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t.Errorf("int enc instructions: expected % x got % x", signedResult, b.Data())
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}
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@ -166,8 +159,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a uint } { 17 };
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instr := &encInstr{ encUint, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(unsignedResult, b.Data()) {
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t.Errorf("uint enc instructions: expected % x got % x", unsignedResult, b.Data())
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}
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@ -179,8 +171,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a int8 } { 17 };
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instr := &encInstr{ encInt, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(signedResult, b.Data()) {
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t.Errorf("int8 enc instructions: expected % x got % x", signedResult, b.Data())
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}
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@ -192,8 +183,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a uint8 } { 17 };
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instr := &encInstr{ encUint, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(unsignedResult, b.Data()) {
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t.Errorf("uint8 enc instructions: expected % x got % x", unsignedResult, b.Data())
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}
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@ -208,8 +198,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a int16 } { 17 };
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instr := &encInstr{ encInt16, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(signedResult, b.Data()) {
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t.Errorf("int16 enc instructions: expected % x got % x", signedResult, b.Data())
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}
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@ -221,8 +210,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a uint16 } { 17 };
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instr := &encInstr{ encUint16, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(unsignedResult, b.Data()) {
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t.Errorf("uint16 enc instructions: expected % x got % x", unsignedResult, b.Data())
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}
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@ -234,8 +222,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a int32 } { 17 };
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instr := &encInstr{ encInt32, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(signedResult, b.Data()) {
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t.Errorf("int32 enc instructions: expected % x got % x", signedResult, b.Data())
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}
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@ -247,8 +234,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a uint32 } { 17 };
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instr := &encInstr{ encUint32, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(unsignedResult, b.Data()) {
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t.Errorf("uint32 enc instructions: expected % x got % x", unsignedResult, b.Data())
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}
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@ -260,8 +246,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a int64 } { 17 };
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instr := &encInstr{ encInt64, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(signedResult, b.Data()) {
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t.Errorf("int64 enc instructions: expected % x got % x", signedResult, b.Data())
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}
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@ -273,8 +258,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a uint64 } { 17 };
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instr := &encInstr{ encUint, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(unsignedResult, b.Data()) {
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t.Errorf("uint64 enc instructions: expected % x got % x", unsignedResult, b.Data())
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}
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@ -286,8 +270,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a float } { 17 };
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instr := &encInstr{ encFloat, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(floatResult, b.Data()) {
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t.Errorf("float enc instructions: expected % x got % x", floatResult, b.Data())
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}
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@ -299,8 +282,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a float32 } { 17 };
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instr := &encInstr{ encFloat32, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(floatResult, b.Data()) {
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t.Errorf("float32 enc instructions: expected % x got % x", floatResult, b.Data())
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}
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@ -312,8 +294,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a float64 } { 17 };
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instr := &encInstr{ encFloat64, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(floatResult, b.Data()) {
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t.Errorf("float64 enc instructions: expected % x got % x", floatResult, b.Data())
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}
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@ -325,8 +306,7 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a []byte } { strings.Bytes("hello") };
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instr := &encInstr{ encUint8Array, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(bytesResult, b.Data()) {
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t.Errorf("bytes enc instructions: expected % x got % x", bytesResult, b.Data())
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}
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@ -338,21 +318,14 @@ func TestScalarEncInstructions(t *testing.T) {
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data := struct { a string } { "hello" };
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instr := &encInstr{ encString, 6, 0, 0 };
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state := newEncState(b);
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state.base = uintptr(unsafe.Pointer(&data));
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instr.op(instr, state, encAddrOf(state, instr));
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instr.op(instr, state, unsafe.Pointer(&data));
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if !bytes.Equal(bytesResult, b.Data()) {
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t.Errorf("string enc instructions: expected % x got % x", bytesResult, b.Data())
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}
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}
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}
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// derive the address of a field, after indirecting indir times.
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func decAddrOf(state *DecState, instr *decInstr) unsafe.Pointer {
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p := unsafe.Pointer(state.base+instr.offset);
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return decIndirect(p, instr.indir);
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}
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func execDec(typ string, instr *decInstr, state *DecState, t *testing.T) {
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func execDec(typ string, instr *decInstr, state *DecState, t *testing.T, p unsafe.Pointer) {
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v := int(DecodeUint(state));
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if state.err != nil {
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t.Fatalf("decoding %s field: %v", typ, state.err);
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@ -360,7 +333,7 @@ func execDec(typ string, instr *decInstr, state *DecState, t *testing.T) {
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if v + state.fieldnum != 6 {
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t.Fatalf("decoding field number %d, got %d", 6, v + state.fieldnum);
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}
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instr.op(instr, state, decAddrOf(state, instr));
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instr.op(instr, state, decIndirect(p, instr.indir));
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state.fieldnum = 6;
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}
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@ -380,8 +353,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a bool };
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instr := &decInstr{ decBool, 6, 0, 0 };
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state := newDecState(boolResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("bool", instr, state, t);
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execDec("bool", instr, state, t, unsafe.Pointer(&data));
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if data.a != true {
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t.Errorf("int a = %v not true", data.a)
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}
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@ -391,8 +363,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a int };
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instr := &decInstr{ decInt, 6, 0, 0 };
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state := newDecState(signedResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("int", instr, state, t);
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execDec("int", instr, state, t, unsafe.Pointer(&data));
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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@ -403,8 +374,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a uint };
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instr := &decInstr{ decUint, 6, 0, 0 };
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state := newDecState(unsignedResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("uint", instr, state, t);
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execDec("uint", instr, state, t, unsafe.Pointer(&data));
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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@ -415,8 +385,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a int8 };
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instr := &decInstr{ decInt8, 6, 0, 0 };
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state := newDecState(signedResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("int8", instr, state, t);
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execDec("int8", instr, state, t, unsafe.Pointer(&data));
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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@ -427,8 +396,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a uint8 };
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instr := &decInstr{ decUint8, 6, 0, 0 };
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state := newDecState(unsignedResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("uint8", instr, state, t);
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execDec("uint8", instr, state, t, unsafe.Pointer(&data));
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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@ -439,8 +407,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a int16 };
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instr := &decInstr{ decInt16, 6, 0, 0 };
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state := newDecState(signedResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("int16", instr, state, t);
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execDec("int16", instr, state, t, unsafe.Pointer(&data));
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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@ -451,8 +418,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a uint16 };
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instr := &decInstr{ decUint16, 6, 0, 0 };
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state := newDecState(unsignedResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("uint16", instr, state, t);
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execDec("uint16", instr, state, t, unsafe.Pointer(&data));
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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@ -463,8 +429,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a int32 };
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instr := &decInstr{ decInt32, 6, 0, 0 };
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state := newDecState(signedResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("int32", instr, state, t);
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execDec("int32", instr, state, t, unsafe.Pointer(&data));
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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@ -475,8 +440,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a uint32 };
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instr := &decInstr{ decUint32, 6, 0, 0 };
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state := newDecState(unsignedResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("uint32", instr, state, t);
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execDec("uint32", instr, state, t, unsafe.Pointer(&data));
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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@ -487,8 +451,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a int64 };
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instr := &decInstr{ decInt64, 6, 0, 0 };
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state := newDecState(signedResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("int64", instr, state, t);
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execDec("int64", instr, state, t, unsafe.Pointer(&data));
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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@ -499,8 +462,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a uint64 };
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instr := &decInstr{ decUint64, 6, 0, 0 };
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state := newDecState(unsignedResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("uint64", instr, state, t);
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execDec("uint64", instr, state, t, unsafe.Pointer(&data));
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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@ -511,8 +473,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a float };
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instr := &decInstr{ decFloat, 6, 0, 0 };
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state := newDecState(floatResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("float", instr, state, t);
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execDec("float", instr, state, t, unsafe.Pointer(&data));
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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@ -523,8 +484,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a float32 };
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instr := &decInstr{ decFloat32, 6, 0, 0 };
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state := newDecState(floatResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("float32", instr, state, t);
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execDec("float32", instr, state, t, unsafe.Pointer(&data));
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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@ -535,8 +495,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a float64 };
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instr := &decInstr{ decFloat64, 6, 0, 0 };
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state := newDecState(floatResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("float64", instr, state, t);
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execDec("float64", instr, state, t, unsafe.Pointer(&data));
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if data.a != 17 {
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t.Errorf("int a = %v not 17", data.a)
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}
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@ -547,8 +506,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a []byte };
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instr := &decInstr{ decUint8Array, 6, 0, 0 };
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state := newDecState(bytesResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("bytes", instr, state, t);
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execDec("bytes", instr, state, t, unsafe.Pointer(&data));
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if string(data.a) != "hello" {
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t.Errorf(`bytes a = %q not "hello"`, string(data.a))
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}
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@ -559,8 +517,7 @@ func TestScalarDecInstructions(t *testing.T) {
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var data struct { a string };
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instr := &decInstr{ decString, 6, 0, 0 };
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state := newDecState(bytesResult);
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state.base = uintptr(unsafe.Pointer(&data));
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execDec("bytes", instr, state, t);
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execDec("bytes", instr, state, t, unsafe.Pointer(&data));
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if data.a != "hello" {
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t.Errorf(`bytes a = %q not "hello"`, data.a)
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}
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@ -574,6 +531,7 @@ func TestEncode(t *testing.T) {
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}
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type T1 struct {
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a, b,c int;
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n *[3]float;
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s string;
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y []byte;
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t *T2;
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@ -582,6 +540,7 @@ func TestEncode(t *testing.T) {
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a: 17,
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b: 18,
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c: -5,
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n: &[3]float{1.5, 2.5, 3.5},
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s: "Now is the time",
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y: strings.Bytes("hello, sailor"),
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t: &T2{"this is T2"},
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@ -20,7 +20,6 @@ import (
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type DecState struct {
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||||
r io.Reader;
|
||||
err os.Error;
|
||||
base uintptr;
|
||||
fieldnum int; // the last field number read.
|
||||
buf [1]byte; // buffer used by the decoder; here to avoid allocation.
|
||||
}
|
||||
@ -279,11 +278,21 @@ type decEngine struct {
|
||||
instr []decInstr
|
||||
}
|
||||
|
||||
func (engine *decEngine) decodeStruct(r io.Reader, p uintptr) os.Error {
|
||||
func decodeStruct(engine *decEngine, rtyp reflect.StructType, r io.Reader, p uintptr, indir int) os.Error {
|
||||
if indir > 0 {
|
||||
up := unsafe.Pointer(p);
|
||||
if *(*unsafe.Pointer)(up) == nil {
|
||||
// Allocate the structure by making a slice of bytes and recording the
|
||||
// address of the beginning of the array. TODO(rsc).
|
||||
b := make([]byte, rtyp.Size());
|
||||
*(*unsafe.Pointer)(up) = unsafe.Pointer(&b[0]);
|
||||
}
|
||||
p = *(*uintptr)(up);
|
||||
}
|
||||
state := new(DecState);
|
||||
state.r = r;
|
||||
state.base = p;
|
||||
state.fieldnum = -1;
|
||||
basep := p;
|
||||
for state.err == nil {
|
||||
delta := int(DecodeUint(state));
|
||||
if state.err != nil || delta == 0 { // struct terminator is zero delta fieldnum
|
||||
@ -294,7 +303,7 @@ func (engine *decEngine) decodeStruct(r io.Reader, p uintptr) os.Error {
|
||||
panicln("TODO(r): need to handle unknown data");
|
||||
}
|
||||
instr := &engine.instr[fieldnum];
|
||||
p := unsafe.Pointer(state.base+instr.offset);
|
||||
p := unsafe.Pointer(basep+instr.offset);
|
||||
if instr.indir > 1 {
|
||||
p = decIndirect(p, instr.indir);
|
||||
}
|
||||
@ -304,6 +313,28 @@ func (engine *decEngine) decodeStruct(r io.Reader, p uintptr) os.Error {
|
||||
return state.err
|
||||
}
|
||||
|
||||
func decodeArray(atyp reflect.ArrayType, state *DecState, p uintptr, elemOp decOp, elemWid int, length int, indir int) os.Error {
|
||||
if indir > 0 {
|
||||
up := unsafe.Pointer(p);
|
||||
if *(*unsafe.Pointer)(up) == nil {
|
||||
// Allocate the structure by making a slice of bytes and recording the
|
||||
// address of the beginning of the array. TODO(rsc).
|
||||
b := make([]byte, atyp.Size());
|
||||
*(*unsafe.Pointer)(up) = unsafe.Pointer(&b[0]);
|
||||
}
|
||||
p = *(*uintptr)(up);
|
||||
}
|
||||
instr := &decInstr{elemOp, 0, 0, 0}; // TODO(r): indir on elements
|
||||
if DecodeUint(state) != uint64(length) {
|
||||
state.err = os.ErrorString("length mismatch in decodeArray");
|
||||
}
|
||||
for i := 0; i < length && state.err == nil; i++ {
|
||||
elemOp(instr, state, unsafe.Pointer(p));
|
||||
p += uintptr(elemWid);
|
||||
}
|
||||
return state.err
|
||||
}
|
||||
|
||||
var decEngineMap = make(map[reflect.Type] *decEngine)
|
||||
var decOpMap = map[int] decOp {
|
||||
reflect.BoolKind: decBool,
|
||||
@ -331,16 +362,23 @@ func decOpFor(typ reflect.Type) decOp {
|
||||
// Special cases
|
||||
if typ.Kind() == reflect.ArrayKind {
|
||||
atyp := typ.(reflect.ArrayType);
|
||||
switch atyp.Elem().Kind() {
|
||||
case reflect.Uint8Kind:
|
||||
switch {
|
||||
case atyp.Elem().Kind() == reflect.Uint8Kind:
|
||||
op = decUint8Array
|
||||
case atyp.IsSlice():
|
||||
case !atyp.IsSlice():
|
||||
elemOp := decOpFor(atyp.Elem());
|
||||
op = func(i *decInstr, state *DecState, p unsafe.Pointer) {
|
||||
state.err = decodeArray(atyp, state, uintptr(p), elemOp, atyp.Elem().Size(), atyp.Len(), i.indir);
|
||||
};
|
||||
}
|
||||
}
|
||||
if typ.Kind() == reflect.StructKind {
|
||||
// Generate a closure that calls out to the engine for the nested type.
|
||||
engine := getDecEngine(typ);
|
||||
styp := typ.(reflect.StructType);
|
||||
op = func(i *decInstr, state *DecState, p unsafe.Pointer) {
|
||||
state.err = engine.decodeStruct(state.r, uintptr(p))
|
||||
state.err = decodeStruct(engine, styp, state.r, uintptr(p), i.indir)
|
||||
};
|
||||
}
|
||||
}
|
||||
@ -401,11 +439,11 @@ func Decode(r io.Reader, e interface{}) os.Error {
|
||||
rt = pt.Sub();
|
||||
v = reflect.Indirect(v);
|
||||
}
|
||||
if v.Kind() != reflect.StructKind {
|
||||
return os.ErrorString("decode can't handle " + v.Type().String())
|
||||
if rt.Kind() != reflect.StructKind {
|
||||
return os.ErrorString("decode can't handle " + rt.String())
|
||||
}
|
||||
typeLock.Lock();
|
||||
engine := getDecEngine(rt);
|
||||
typeLock.Unlock();
|
||||
return engine.decodeStruct(r, uintptr(v.Addr()));
|
||||
return decodeStruct(engine, rt.(reflect.StructType), r, uintptr(v.Addr()), 0);
|
||||
}
|
||||
|
||||
@ -20,7 +20,6 @@ import (
|
||||
// 0 terminates the structure.
|
||||
type EncState struct {
|
||||
w io.Writer;
|
||||
base uintptr; // the base address of the data structure being written
|
||||
err os.Error; // error encountered during encoding;
|
||||
fieldnum int; // the last field number written.
|
||||
buf [16]byte; // buffer used by the encoder; here to avoid allocation.
|
||||
@ -71,6 +70,15 @@ type encInstr struct {
|
||||
offset uintptr; // offset in the structure of the field to encode
|
||||
}
|
||||
|
||||
// Emit a field number and update the state to record its value for delta encoding.
|
||||
// If the instruction pointer is nil, do nothing
|
||||
func (state *EncState) update(instr *encInstr) {
|
||||
if instr != nil {
|
||||
EncodeUint(state, uint64(instr.field - state.fieldnum));
|
||||
state.fieldnum = instr.field;
|
||||
}
|
||||
}
|
||||
|
||||
// Each encoder is responsible for handling any indirections associated
|
||||
// with the data structure. If any pointer so reached is nil, no bytes are written.
|
||||
// If the data item is zero, no bytes are written.
|
||||
@ -90,99 +98,88 @@ func encIndirect(p unsafe.Pointer, indir int) unsafe.Pointer {
|
||||
func encBool(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
b := *(*bool)(p);
|
||||
if b {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeUint(state, 1);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
func encInt(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
v := int64(*(*int)(p));
|
||||
if v != 0 {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeInt(state, v);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
func encUint(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
v := uint64(*(*uint)(p));
|
||||
if v != 0 {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeUint(state, v);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
func encInt8(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
v := int64(*(*int8)(p));
|
||||
if v != 0 {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeInt(state, v);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
func encUint8(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
v := uint64(*(*uint8)(p));
|
||||
if v != 0 {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeUint(state, v);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
func encInt16(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
v := int64(*(*int16)(p));
|
||||
if v != 0 {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeInt(state, v);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
func encUint16(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
v := uint64(*(*uint16)(p));
|
||||
if v != 0 {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeUint(state, v);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
func encInt32(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
v := int64(*(*int32)(p));
|
||||
if v != 0 {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeInt(state, v);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
func encUint32(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
v := uint64(*(*uint32)(p));
|
||||
if v != 0 {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeUint(state, v);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
func encInt64(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
v := *(*int64)(p);
|
||||
if v != 0 {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeInt(state, v);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
func encUint64(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
v := *(*uint64)(p);
|
||||
if v != 0 {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeUint(state, v);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
@ -206,9 +203,8 @@ func encFloat(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
f := float(*(*float)(p));
|
||||
if f != 0 {
|
||||
v := floatBits(float64(f));
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeUint(state, v);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
@ -216,19 +212,17 @@ func encFloat32(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
f := float32(*(*float32)(p));
|
||||
if f != 0 {
|
||||
v := floatBits(float64(f));
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeUint(state, v);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
func encFloat64(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
f := *(*float64)(p);
|
||||
if f != 0 {
|
||||
state.update(i);
|
||||
v := floatBits(f);
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
EncodeUint(state, v);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
@ -236,10 +230,9 @@ func encFloat64(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
func encUint8Array(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
b := *(*[]byte)(p);
|
||||
if len(b) > 0 {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeUint(state, uint64(len(b)));
|
||||
state.w.Write(b);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
@ -247,10 +240,9 @@ func encUint8Array(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
func encString(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
s := *(*string)(p);
|
||||
if len(s) > 0 {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.update(i);
|
||||
EncodeUint(state, uint64(len(s)));
|
||||
io.WriteString(state.w, s);
|
||||
state.fieldnum = i.field;
|
||||
}
|
||||
}
|
||||
|
||||
@ -267,14 +259,13 @@ type encEngine struct {
|
||||
instr []encInstr
|
||||
}
|
||||
|
||||
func (engine *encEngine) encodeStruct(w io.Writer, p uintptr) os.Error {
|
||||
func encodeStruct(engine *encEngine, w io.Writer, basep uintptr) os.Error {
|
||||
state := new(EncState);
|
||||
state.w = w;
|
||||
state.base = p;
|
||||
state.fieldnum = -1;
|
||||
for i := 0; i < len(engine.instr); i++ {
|
||||
instr := &engine.instr[i];
|
||||
p := unsafe.Pointer(state.base+instr.offset);
|
||||
p := unsafe.Pointer(basep+instr.offset);
|
||||
if instr.indir > 0 {
|
||||
if p = encIndirect(p, instr.indir); p == nil {
|
||||
state.fieldnum = i;
|
||||
@ -289,6 +280,18 @@ func (engine *encEngine) encodeStruct(w io.Writer, p uintptr) os.Error {
|
||||
return state.err
|
||||
}
|
||||
|
||||
func encodeArray(w io.Writer, p uintptr, op encOp, elemWid int, length int) os.Error {
|
||||
state := new(EncState);
|
||||
state.w = w;
|
||||
state.fieldnum = -1;
|
||||
EncodeUint(state, uint64(length));
|
||||
for i := 0; i < length && state.err == nil; i++ {
|
||||
op(nil, state, unsafe.Pointer(p)); // TODO(r): indir on elements
|
||||
p += uintptr(elemWid);
|
||||
}
|
||||
return state.err
|
||||
}
|
||||
|
||||
var encEngineMap = make(map[reflect.Type] *encEngine)
|
||||
var encOpMap = map[int] encOp {
|
||||
reflect.BoolKind: encBool,
|
||||
@ -316,18 +319,35 @@ func encOpFor(typ reflect.Type) encOp {
|
||||
// Special cases
|
||||
if typ.Kind() == reflect.ArrayKind {
|
||||
atyp := typ.(reflect.ArrayType);
|
||||
switch atyp.Elem().Kind() {
|
||||
case reflect.Uint8Kind:
|
||||
switch {
|
||||
case atyp.Elem().Kind() == reflect.Uint8Kind:
|
||||
op = encUint8Array
|
||||
case atyp.IsSlice():
|
||||
// Slices have a header; we decode it to find the underlying array.
|
||||
elemOp := encOpFor(atyp.Elem());
|
||||
op = func(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
slice := *(*reflect.SliceHeader)(p);
|
||||
if slice.Len == 0 {
|
||||
return
|
||||
}
|
||||
state.update(i);
|
||||
state.err = encodeArray(state.w, slice.Data, elemOp, atyp.Elem().Size(), int(slice.Len));
|
||||
};
|
||||
case !atyp.IsSlice():
|
||||
// True arrays have size in the type.
|
||||
elemOp := encOpFor(atyp.Elem());
|
||||
op = func(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
state.update(i);
|
||||
state.err = encodeArray(state.w, uintptr(p), elemOp, atyp.Elem().Size(), atyp.Len());
|
||||
};
|
||||
}
|
||||
}
|
||||
if typ.Kind() == reflect.StructKind {
|
||||
// Generate a closure that calls out to the engine for the nested type.
|
||||
engine := getEncEngine(typ);
|
||||
op = func(i *encInstr, state *EncState, p unsafe.Pointer) {
|
||||
EncodeUint(state, uint64(i.field - state.fieldnum));
|
||||
state.err = engine.encodeStruct(state.w, uintptr(p));
|
||||
state.fieldnum = i.field;
|
||||
state.update(i);
|
||||
state.err = encodeStruct(engine, state.w, uintptr(p));
|
||||
};
|
||||
}
|
||||
}
|
||||
@ -394,5 +414,5 @@ func Encode(w io.Writer, e interface{}) os.Error {
|
||||
typeLock.Lock();
|
||||
engine := getEncEngine(rt);
|
||||
typeLock.Unlock();
|
||||
return engine.encodeStruct(w, uintptr(v.(reflect.StructValue).Addr()));
|
||||
return encodeStruct(engine, w, uintptr(v.(reflect.StructValue).Addr()));
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user