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path: root/src/pkg/gob/encode.go
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Diffstat (limited to 'src/pkg/gob/encode.go')
-rw-r--r--src/pkg/gob/encode.go298
1 files changed, 149 insertions, 149 deletions
diff --git a/src/pkg/gob/encode.go b/src/pkg/gob/encode.go
index 36845b87c..fb9710928 100644
--- a/src/pkg/gob/encode.go
+++ b/src/pkg/gob/encode.go
@@ -5,12 +5,12 @@
package gob
import (
- "bytes";
- "io";
- "math";
- "os";
- "reflect";
- "unsafe";
+ "bytes"
+ "io"
+ "math"
+ "os"
+ "reflect"
+ "unsafe"
)
const uint64Size = unsafe.Sizeof(uint64(0))
@@ -20,10 +20,10 @@ const uint64Size = unsafe.Sizeof(uint64(0))
// number is initialized to -1 so 0 comes out as delta(1). A delta of
// 0 terminates the structure.
type encoderState struct {
- b *bytes.Buffer;
- err os.Error; // error encountered during encoding;
- fieldnum int; // the last field number written.
- buf [1 + uint64Size]byte; // buffer used by the encoder; here to avoid allocation.
+ b *bytes.Buffer
+ err os.Error // error encountered during encoding;
+ fieldnum int // the last field number written.
+ buf [1 + uint64Size]byte // buffer used by the encoder; here to avoid allocation.
}
// Unsigned integers have a two-state encoding. If the number is less
@@ -38,49 +38,49 @@ func encodeUint(state *encoderState, x uint64) {
return
}
if x <= 0x7F {
- state.err = state.b.WriteByte(uint8(x));
- return;
+ state.err = state.b.WriteByte(uint8(x))
+ return
}
- var n, m int;
- m = uint64Size;
+ var n, m int
+ m = uint64Size
for n = 1; x > 0; n++ {
- state.buf[m] = uint8(x & 0xFF);
- x >>= 8;
- m--;
+ state.buf[m] = uint8(x & 0xFF)
+ x >>= 8
+ m--
}
- state.buf[m] = uint8(-(n - 1));
- n, state.err = state.b.Write(state.buf[m : uint64Size+1]);
+ state.buf[m] = uint8(-(n - 1))
+ n, state.err = state.b.Write(state.buf[m : uint64Size+1])
}
// encodeInt writes an encoded signed integer to state.w.
// The low bit of the encoding says whether to bit complement the (other bits of the) uint to recover the int.
// Sets state.err. If state.err is already non-nil, it does nothing.
func encodeInt(state *encoderState, i int64) {
- var x uint64;
+ var x uint64
if i < 0 {
x = uint64(^i<<1) | 1
} else {
x = uint64(i << 1)
}
- encodeUint(state, uint64(x));
+ encodeUint(state, uint64(x))
}
type encOp func(i *encInstr, state *encoderState, p unsafe.Pointer)
// The 'instructions' of the encoding machine
type encInstr struct {
- op encOp;
- field int; // field number
- indir int; // how many pointer indirections to reach the value in the struct
- offset uintptr; // offset in the structure of the field to encode
+ op encOp
+ field int // field number
+ indir int // how many pointer indirections to reach the value in the 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 *encoderState) update(instr *encInstr) {
if instr != nil {
- encodeUint(state, uint64(instr.field-state.fieldnum));
- state.fieldnum = instr.field;
+ encodeUint(state, uint64(instr.field-state.fieldnum))
+ state.fieldnum = instr.field
}
}
@@ -92,107 +92,107 @@ func (state *encoderState) update(instr *encInstr) {
func encIndirect(p unsafe.Pointer, indir int) unsafe.Pointer {
for ; indir > 0; indir-- {
- p = *(*unsafe.Pointer)(p);
+ p = *(*unsafe.Pointer)(p)
if p == nil {
return unsafe.Pointer(nil)
}
}
- return p;
+ return p
}
func encBool(i *encInstr, state *encoderState, p unsafe.Pointer) {
- b := *(*bool)(p);
+ b := *(*bool)(p)
if b {
- state.update(i);
- encodeUint(state, 1);
+ state.update(i)
+ encodeUint(state, 1)
}
}
func encInt(i *encInstr, state *encoderState, p unsafe.Pointer) {
- v := int64(*(*int)(p));
+ v := int64(*(*int)(p))
if v != 0 {
- state.update(i);
- encodeInt(state, v);
+ state.update(i)
+ encodeInt(state, v)
}
}
func encUint(i *encInstr, state *encoderState, p unsafe.Pointer) {
- v := uint64(*(*uint)(p));
+ v := uint64(*(*uint)(p))
if v != 0 {
- state.update(i);
- encodeUint(state, v);
+ state.update(i)
+ encodeUint(state, v)
}
}
func encInt8(i *encInstr, state *encoderState, p unsafe.Pointer) {
- v := int64(*(*int8)(p));
+ v := int64(*(*int8)(p))
if v != 0 {
- state.update(i);
- encodeInt(state, v);
+ state.update(i)
+ encodeInt(state, v)
}
}
func encUint8(i *encInstr, state *encoderState, p unsafe.Pointer) {
- v := uint64(*(*uint8)(p));
+ v := uint64(*(*uint8)(p))
if v != 0 {
- state.update(i);
- encodeUint(state, v);
+ state.update(i)
+ encodeUint(state, v)
}
}
func encInt16(i *encInstr, state *encoderState, p unsafe.Pointer) {
- v := int64(*(*int16)(p));
+ v := int64(*(*int16)(p))
if v != 0 {
- state.update(i);
- encodeInt(state, v);
+ state.update(i)
+ encodeInt(state, v)
}
}
func encUint16(i *encInstr, state *encoderState, p unsafe.Pointer) {
- v := uint64(*(*uint16)(p));
+ v := uint64(*(*uint16)(p))
if v != 0 {
- state.update(i);
- encodeUint(state, v);
+ state.update(i)
+ encodeUint(state, v)
}
}
func encInt32(i *encInstr, state *encoderState, p unsafe.Pointer) {
- v := int64(*(*int32)(p));
+ v := int64(*(*int32)(p))
if v != 0 {
- state.update(i);
- encodeInt(state, v);
+ state.update(i)
+ encodeInt(state, v)
}
}
func encUint32(i *encInstr, state *encoderState, p unsafe.Pointer) {
- v := uint64(*(*uint32)(p));
+ v := uint64(*(*uint32)(p))
if v != 0 {
- state.update(i);
- encodeUint(state, v);
+ state.update(i)
+ encodeUint(state, v)
}
}
func encInt64(i *encInstr, state *encoderState, p unsafe.Pointer) {
- v := *(*int64)(p);
+ v := *(*int64)(p)
if v != 0 {
- state.update(i);
- encodeInt(state, v);
+ state.update(i)
+ encodeInt(state, v)
}
}
func encUint64(i *encInstr, state *encoderState, p unsafe.Pointer) {
- v := *(*uint64)(p);
+ v := *(*uint64)(p)
if v != 0 {
- state.update(i);
- encodeUint(state, v);
+ state.update(i)
+ encodeUint(state, v)
}
}
func encUintptr(i *encInstr, state *encoderState, p unsafe.Pointer) {
- v := uint64(*(*uintptr)(p));
+ v := uint64(*(*uintptr)(p))
if v != 0 {
- state.update(i);
- encodeUint(state, v);
+ state.update(i)
+ encodeUint(state, v)
}
}
@@ -202,60 +202,60 @@ func encUintptr(i *encInstr, state *encoderState, p unsafe.Pointer) {
// (for example) transmit more compactly. This routine does the
// swizzling.
func floatBits(f float64) uint64 {
- u := math.Float64bits(f);
- var v uint64;
+ u := math.Float64bits(f)
+ var v uint64
for i := 0; i < 8; i++ {
- v <<= 8;
- v |= u & 0xFF;
- u >>= 8;
+ v <<= 8
+ v |= u & 0xFF
+ u >>= 8
}
- return v;
+ return v
}
func encFloat(i *encInstr, state *encoderState, p unsafe.Pointer) {
- f := float(*(*float)(p));
+ f := float(*(*float)(p))
if f != 0 {
- v := floatBits(float64(f));
- state.update(i);
- encodeUint(state, v);
+ v := floatBits(float64(f))
+ state.update(i)
+ encodeUint(state, v)
}
}
func encFloat32(i *encInstr, state *encoderState, p unsafe.Pointer) {
- f := float32(*(*float32)(p));
+ f := float32(*(*float32)(p))
if f != 0 {
- v := floatBits(float64(f));
- state.update(i);
- encodeUint(state, v);
+ v := floatBits(float64(f))
+ state.update(i)
+ encodeUint(state, v)
}
}
func encFloat64(i *encInstr, state *encoderState, p unsafe.Pointer) {
- f := *(*float64)(p);
+ f := *(*float64)(p)
if f != 0 {
- state.update(i);
- v := floatBits(f);
- encodeUint(state, v);
+ state.update(i)
+ v := floatBits(f)
+ encodeUint(state, v)
}
}
// Byte arrays are encoded as an unsigned count followed by the raw bytes.
func encUint8Array(i *encInstr, state *encoderState, p unsafe.Pointer) {
- b := *(*[]byte)(p);
+ b := *(*[]byte)(p)
if len(b) > 0 {
- state.update(i);
- encodeUint(state, uint64(len(b)));
- state.b.Write(b);
+ state.update(i)
+ encodeUint(state, uint64(len(b)))
+ state.b.Write(b)
}
}
// Strings are encoded as an unsigned count followed by the raw bytes.
func encString(i *encInstr, state *encoderState, p unsafe.Pointer) {
- s := *(*string)(p);
+ s := *(*string)(p)
if len(s) > 0 {
- state.update(i);
- encodeUint(state, uint64(len(s)));
- io.WriteString(state.b, s);
+ state.update(i)
+ encodeUint(state, uint64(len(s)))
+ io.WriteString(state.b, s)
}
}
@@ -269,48 +269,48 @@ func encStructTerminator(i *encInstr, state *encoderState, p unsafe.Pointer) {
// The encoder engine is an array of instructions indexed by field number of the encoding
// data, typically a struct. It is executed top to bottom, walking the struct.
type encEngine struct {
- instr []encInstr;
+ instr []encInstr
}
func encodeStruct(engine *encEngine, b *bytes.Buffer, basep uintptr) os.Error {
- state := new(encoderState);
- state.b = b;
- state.fieldnum = -1;
+ state := new(encoderState)
+ state.b = b
+ state.fieldnum = -1
for i := 0; i < len(engine.instr); i++ {
- instr := &engine.instr[i];
- p := unsafe.Pointer(basep + instr.offset);
+ instr := &engine.instr[i]
+ p := unsafe.Pointer(basep + instr.offset)
if instr.indir > 0 {
if p = encIndirect(p, instr.indir); p == nil {
continue
}
}
- instr.op(instr, state, p);
+ instr.op(instr, state, p)
if state.err != nil {
break
}
}
- return state.err;
+ return state.err
}
func encodeArray(b *bytes.Buffer, p uintptr, op encOp, elemWid uintptr, length int, elemIndir int) os.Error {
- state := new(encoderState);
- state.b = b;
- state.fieldnum = -1;
- encodeUint(state, uint64(length));
+ state := new(encoderState)
+ state.b = b
+ state.fieldnum = -1
+ encodeUint(state, uint64(length))
for i := 0; i < length && state.err == nil; i++ {
- elemp := p;
- up := unsafe.Pointer(elemp);
+ elemp := p
+ up := unsafe.Pointer(elemp)
if elemIndir > 0 {
if up = encIndirect(up, elemIndir); up == nil {
- state.err = os.ErrorString("gob: encodeArray: nil element");
- break;
+ state.err = os.ErrorString("gob: encodeArray: nil element")
+ break
}
- elemp = uintptr(up);
+ elemp = uintptr(up)
}
- op(nil, state, unsafe.Pointer(elemp));
- p += uintptr(elemWid);
+ op(nil, state, unsafe.Pointer(elemp))
+ p += uintptr(elemWid)
}
- return state.err;
+ return state.err
}
var encOpMap = map[reflect.Type]encOp{
@@ -335,110 +335,110 @@ var encOpMap = map[reflect.Type]encOp{
// Return the encoding op for the base type under rt and
// the indirection count to reach it.
func encOpFor(rt reflect.Type) (encOp, int, os.Error) {
- typ, indir := indirect(rt);
- op, ok := encOpMap[reflect.Typeof(typ)];
+ typ, indir := indirect(rt)
+ op, ok := encOpMap[reflect.Typeof(typ)]
if !ok {
- typ, _ := indirect(rt);
+ typ, _ := indirect(rt)
// Special cases
switch t := typ.(type) {
case *reflect.SliceType:
if _, ok := t.Elem().(*reflect.Uint8Type); ok {
- op = encUint8Array;
- break;
+ op = encUint8Array
+ break
}
// Slices have a header; we decode it to find the underlying array.
- elemOp, indir, err := encOpFor(t.Elem());
+ elemOp, indir, err := encOpFor(t.Elem())
if err != nil {
return nil, 0, err
}
op = func(i *encInstr, state *encoderState, p unsafe.Pointer) {
- slice := (*reflect.SliceHeader)(p);
+ slice := (*reflect.SliceHeader)(p)
if slice.Len == 0 {
return
}
- state.update(i);
- state.err = encodeArray(state.b, slice.Data, elemOp, t.Elem().Size(), int(slice.Len), indir);
- };
+ state.update(i)
+ state.err = encodeArray(state.b, slice.Data, elemOp, t.Elem().Size(), int(slice.Len), indir)
+ }
case *reflect.ArrayType:
// True arrays have size in the type.
- elemOp, indir, err := encOpFor(t.Elem());
+ elemOp, indir, err := encOpFor(t.Elem())
if err != nil {
return nil, 0, err
}
op = func(i *encInstr, state *encoderState, p unsafe.Pointer) {
- state.update(i);
- state.err = encodeArray(state.b, uintptr(p), elemOp, t.Elem().Size(), t.Len(), indir);
- };
+ state.update(i)
+ state.err = encodeArray(state.b, uintptr(p), elemOp, t.Elem().Size(), t.Len(), indir)
+ }
case *reflect.StructType:
// Generate a closure that calls out to the engine for the nested type.
- _, err := getEncEngine(typ);
+ _, err := getEncEngine(typ)
if err != nil {
return nil, 0, err
}
- info := mustGetTypeInfo(typ);
+ info := mustGetTypeInfo(typ)
op = func(i *encInstr, state *encoderState, p unsafe.Pointer) {
- state.update(i);
+ state.update(i)
// indirect through info to delay evaluation for recursive structs
- state.err = encodeStruct(info.encoder, state.b, uintptr(p));
- };
+ state.err = encodeStruct(info.encoder, state.b, uintptr(p))
+ }
}
}
if op == nil {
return op, indir, os.ErrorString("gob enc: can't happen: encode type" + rt.String())
}
- return op, indir, nil;
+ return op, indir, nil
}
// The local Type was compiled from the actual value, so we know it's compatible.
func compileEnc(rt reflect.Type) (*encEngine, os.Error) {
- srt, ok := rt.(*reflect.StructType);
+ srt, ok := rt.(*reflect.StructType)
if !ok {
panicln("can't happen: non-struct")
}
- engine := new(encEngine);
- engine.instr = make([]encInstr, srt.NumField()+1); // +1 for terminator
+ engine := new(encEngine)
+ engine.instr = make([]encInstr, srt.NumField()+1) // +1 for terminator
for fieldnum := 0; fieldnum < srt.NumField(); fieldnum++ {
- f := srt.Field(fieldnum);
- op, indir, err := encOpFor(f.Type);
+ f := srt.Field(fieldnum)
+ op, indir, err := encOpFor(f.Type)
if err != nil {
return nil, err
}
- engine.instr[fieldnum] = encInstr{op, fieldnum, indir, uintptr(f.Offset)};
+ engine.instr[fieldnum] = encInstr{op, fieldnum, indir, uintptr(f.Offset)}
}
- engine.instr[srt.NumField()] = encInstr{encStructTerminator, 0, 0, 0};
- return engine, nil;
+ engine.instr[srt.NumField()] = encInstr{encStructTerminator, 0, 0, 0}
+ return engine, nil
}
// typeLock must be held (or we're in initialization and guaranteed single-threaded).
// The reflection type must have all its indirections processed out.
func getEncEngine(rt reflect.Type) (*encEngine, os.Error) {
- info, err := getTypeInfo(rt);
+ info, err := getTypeInfo(rt)
if err != nil {
return nil, err
}
if info.encoder == nil {
// mark this engine as underway before compiling to handle recursive types.
- info.encoder = new(encEngine);
- info.encoder, err = compileEnc(rt);
+ info.encoder = new(encEngine)
+ info.encoder, err = compileEnc(rt)
}
- return info.encoder, err;
+ return info.encoder, err
}
func encode(b *bytes.Buffer, e interface{}) os.Error {
// Dereference down to the underlying object.
- rt, indir := indirect(reflect.Typeof(e));
- v := reflect.NewValue(e);
+ rt, indir := indirect(reflect.Typeof(e))
+ v := reflect.NewValue(e)
for i := 0; i < indir; i++ {
v = reflect.Indirect(v)
}
if _, ok := v.(*reflect.StructValue); !ok {
return os.ErrorString("gob: encode can't handle " + v.Type().String())
}
- typeLock.Lock();
- engine, err := getEncEngine(rt);
- typeLock.Unlock();
+ typeLock.Lock()
+ engine, err := getEncEngine(rt)
+ typeLock.Unlock()
if err != nil {
return err
}
- return encodeStruct(engine, b, v.Addr());
+ return encodeStruct(engine, b, v.Addr())
}
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-16 22:06:42 +0000