func neededStructAllocationSize(vt *vdl.Type) uint32 {
var totalBits uint32
for fi := 0; fi < vt.NumField(); fi++ {
field := vt.Field(fi)
totalBits += baseTypeSizeBits(field.Type)
}
return roundBitsTo64Alignment(totalBits)
}
func unionType(t *vdl.Type, mp map[string]mojom_types.UserDefinedType) mojom_types.UserDefinedType {
unionFields := make([]mojom_types.UnionField, t.NumField())
for i := 0; i < t.NumField(); i++ {
unionFields[i] = mojom_types.UnionField{
DeclData: &mojom_types.DeclarationData{ShortName: strPtr(t.Field(i).Name)},
Type: vdlToMojomTypeInternal(t.Field(i).Type, false, false, mp),
Tag: uint32(i),
}
}
_, name := vdl.SplitIdent(t.Name())
return &mojom_types.UserDefinedTypeUnionType{
mojom_types.MojomUnion{
DeclData: &mojom_types.DeclarationData{
ShortName: strPtr(name),
FullIdentifier: strPtr(mojomIdentifier(t)),
},
Fields: unionFields,
},
}
}
func structType(t *vdl.Type, mp map[string]mojom_types.UserDefinedType) mojom_types.UserDefinedType {
structFields := make([]mojom_types.StructField, t.NumField())
for i := 0; i < t.NumField(); i++ {
structFields[i] = mojom_types.StructField{
DeclData: &mojom_types.DeclarationData{ShortName: strPtr(t.Field(i).Name)},
Type: vdlToMojomTypeInternal(t.Field(i).Type, false, false, mp),
Offset: 0, // Despite the fact that we can calculated the offset, set it to zero to match the generator
}
}
_, name := vdl.SplitIdent(t.Name())
return &mojom_types.UserDefinedTypeStructType{
mojom_types.MojomStruct{
DeclData: &mojom_types.DeclarationData{
ShortName: strPtr(name),
FullIdentifier: strPtr(mojomIdentifier(t)),
},
Fields: structFields,
},
}
}
// computeStructLayout computes a representation of the fields in a struct, as
// a list ordered by mojom byte field order.
func computeStructLayout(t *vdl.Type) (layout structLayout) {
a := structBitAllocation{}
for i := 0; i < t.NumField(); i++ {
bits := baseTypeSizeBits(t.Field(i).Type)
a = allocateStructBits(a, i+1, int(bits))
}
lastVal := 0
for i, v := range a {
if v != lastVal && v != 0 {
layout = append(layout, structLayoutField{
vdlStructIndex: v - 1,
byteOffset: uint32(i / 8),
bitOffset: uint8(i % 8),
})
lastVal = v
}
}
return
}
func JoinRawBytesAsStruct(targ vdl.Target, structType *vdl.Type, fields []*vom.RawBytes) error {
st, err := targ.StartFields(structType)
if err != nil {
return err
}
if structType.NumField() != len(fields) {
return fmt.Errorf("received %d fields, but %v has %d fields", len(fields), structType, structType.NumField())
}
for i := 0; i < structType.NumField(); i++ {
f := structType.Field(i)
k, t, err := st.StartField(f.Name)
if err != nil {
return err
}
if err := fields[i].FillVDLTarget(t, f.Type); err != nil {
return err
}
if err := st.FinishField(k, t); err != nil {
return err
}
}
return targ.FinishFields(st)
}
func (t target) fromZero(tt *vdl.Type) error {
if tt.IsBytes() {
return t.FromBytes(nil, tt)
}
switch tt.Kind() {
case vdl.Optional:
elemType := tt.Elem()
switch elemType.Kind() {
case vdl.Union, vdl.Struct: // Array? String? Bytes? List? Set?
// Note: for union, this zeros 16 bytes, but for others it does just 8.
zeroBytes(t.current.Bytes())
default:
panic(fmt.Sprintf("Vdl type %v cannot be optional", tt))
}
case vdl.Any:
panic("Any rep not yet determined")
case vdl.Bool:
return t.FromBool(false, tt)
case vdl.Byte, vdl.Uint16, vdl.Uint32, vdl.Uint64:
return t.FromUint(0, tt)
case vdl.Int8, vdl.Int16, vdl.Int32, vdl.Int64:
return t.FromInt(0, tt)
case vdl.Float32, vdl.Float64:
return t.FromFloat(0, tt)
case vdl.String:
return t.FromString("", tt)
case vdl.Enum:
return t.FromEnumLabel(tt.EnumLabel(0), tt)
case vdl.TypeObject:
return t.FromTypeObject(vdl.AnyType)
case vdl.List:
lt, err := t.StartList(tt, 0)
if err != nil {
return err
}
return t.FinishList(lt)
case vdl.Array:
lt, err := t.StartList(tt, tt.Len())
if err != nil {
return err
}
for i := 0; i < tt.Len(); i++ {
targ, err := lt.StartElem(i)
if err != nil {
return err
}
if err := targ.(target).fromZero(tt.Elem()); err != nil {
return err
}
if err := lt.FinishElem(targ); err != nil {
return err
}
}
return t.FinishList(lt)
case vdl.Map:
mt, err := t.StartMap(tt, 0)
if err != nil {
return err
}
return t.FinishMap(mt)
case vdl.Set:
st, err := t.StartSet(tt, 0)
if err != nil {
return err
}
return t.FinishSet(st)
case vdl.Struct:
st, err := t.StartFields(tt)
if err != nil {
return err
}
for i := 0; i < tt.NumField(); i++ {
fld := tt.Field(i)
kt, ft, err := st.StartField(fld.Name)
if err != nil {
return err
}
if err := ft.(target).fromZero(fld.Type); err != nil {
return err
}
if err := st.FinishField(kt, ft); err != nil {
return err
}
}
return t.FinishFields(st)
case vdl.Union:
st, err := t.StartFields(tt)
if err != nil {
return err
}
fld := tt.Field(0)
kt, ft, err := st.StartField(fld.Name)
if err != nil {
return err
}
if err := ft.(target).fromZero(fld.Type); err != nil {
return err
}
if err := st.FinishField(kt, ft); err != nil {
return err
}
return t.FinishFields(st)
default:
panic(fmt.Sprintf("unknown type %v", tt))
}
return nil
}
func (mtv *mojomToTargetTranscoder) transcodeValue(vt *vdl.Type, target vdl.Target, isTopType, isNullable bool) error {
switch vt.Kind() {
case vdl.Bool:
value, err := mtv.modec.ReadBool()
if err != nil {
return err
}
return target.FromBool(value, vt)
case vdl.Int8:
value, err := mtv.modec.ReadInt8()
if err != nil {
return err
}
return target.FromInt(int64(value), vt)
case vdl.Int16:
value, err := mtv.modec.ReadInt16()
if err != nil {
return err
}
return target.FromInt(int64(value), vt)
case vdl.Int32:
value, err := mtv.modec.ReadInt32()
if err != nil {
return err
}
return target.FromInt(int64(value), vt)
case vdl.Int64:
value, err := mtv.modec.ReadInt64()
if err != nil {
return err
}
return target.FromInt(value, vt)
case vdl.Byte:
value, err := mtv.modec.ReadUint8()
if err != nil {
return err
}
return target.FromUint(uint64(value), vt)
case vdl.Uint16:
value, err := mtv.modec.ReadUint16()
if err != nil {
return err
}
return target.FromUint(uint64(value), vt)
case vdl.Uint32:
value, err := mtv.modec.ReadUint32()
if err != nil {
return err
}
return target.FromUint(uint64(value), vt)
case vdl.Uint64:
value, err := mtv.modec.ReadUint64()
if err != nil {
return err
}
return target.FromUint(value, vt)
case vdl.Float32:
value, err := mtv.modec.ReadFloat32()
if err != nil {
return err
}
return target.FromFloat(float64(value), vt)
case vdl.Float64:
value, err := mtv.modec.ReadFloat64()
if err != nil {
return err
}
return target.FromFloat(value, vt)
case vdl.String:
switch ptr, err := mtv.modec.ReadPointer(); {
case err != nil:
return err
case ptr == 0:
return fmt.Errorf("invalid null string pointer")
default:
value, err := mtv.modec.ReadString()
if err != nil {
return err
}
return target.FromString(value, vt)
}
return nil
case vdl.Enum:
index, err := mtv.modec.ReadInt32()
if err != nil {
return err
}
if int(index) >= vt.NumEnumLabel() || index < 0 {
return fmt.Errorf("enum label out of range")
}
target.FromEnumLabel(vt.EnumLabel(int(index)), vt)
return nil
case vdl.Array, vdl.List:
switch ptr, err := mtv.modec.ReadPointer(); {
case err != nil:
return err
case ptr == 0 && isNullable:
return target.FromNil(vdl.OptionalType(vt))
case ptr == 0 && !isNullable:
return fmt.Errorf("invalid null struct pointer")
}
if vt.IsBytes() {
str, err := mtv.modec.ReadString()
if err != nil {
return err
}
return target.FromBytes([]byte(str), vt)
} else {
elemBitSize := baseTypeSizeBits(vt.Elem())
numElems, err := mtv.modec.StartArray(elemBitSize)
if err != nil {
return err
}
listTarget, err := target.StartList(vt, int(numElems))
if err != nil {
return err
}
for i := 0; i < int(numElems); i++ {
elemTarget, err := listTarget.StartElem(i)
if err != nil {
return err
}
if err := mtv.transcodeValue(vt.Elem(), elemTarget, false, false); err != nil {
return err
}
if err := listTarget.FinishElem(elemTarget); err != nil {
return err
}
}
if err := target.FinishList(listTarget); err != nil {
return err
}
}
return mtv.modec.Finish()
case vdl.Set:
panic("unimplemented")
/*switch ptr, err := d.dec.ReadPointer(); {
case err != nil:
return err
case ptr == 0 && isNullable:
return target.FromNil(vdl.OptionalType(vt))
case ptr == 0 && !isNullable:
return fmt.Errorf("invalid null struct pointer")
}
keyBitSize := baseTypeSizeBits(vt.Key())
numKeys, err := d.dec.StartArray(keyBitSize)
if err != nil {
return err
}
setTarget, err := target.StartSet(vt, int(numKeys))
if err != nil {
return err
}
for i := 0; i < int(numKeys); i++ {
keyTarget, err := setTarget.StartKey()
if err != nil {
return err
}
if err := d.decodeValue(mt.Key, keyTarget, false, false); err != nil {
return err
}
if err := setTarget.FinishKey(keyTarget); err != nil {
return err
}
}
if err := target.FinishSet(setTarget); err != nil {
return err
}
return d.dec.Finish()*/
case vdl.Map:
switch ptr, err := mtv.modec.ReadPointer(); {
case err != nil:
return err
case ptr == 0 && isNullable:
return target.FromNil(vdl.OptionalType(vt))
case ptr == 0 && !isNullable:
return fmt.Errorf("invalid null struct pointer")
}
if err := mtv.modec.StartMap(); err != nil {
return err
}
var keys, values []*vdl.Value
keysTarget, err := vdl.ReflectTarget(reflect.ValueOf(&keys))
if err != nil {
return err
}
keysListType := vdl.ListType(vt.Key())
if err := mtv.transcodeValue(keysListType, keysTarget, false, false); err != nil {
return err
}
valuesTarget, err := vdl.ReflectTarget(reflect.ValueOf(&values))
if err != nil {
return err
}
valuesListType := vdl.ListType(vt.Elem())
if err := mtv.transcodeValue(valuesListType, valuesTarget, false, false); err != nil {
return err
}
if len(keys) != len(values) {
return fmt.Errorf("values don't match keys")
}
mapTarget, err := target.StartMap(vt, len(keys))
if err != nil {
return err
}
for i, key := range keys {
value := values[i]
keyTarget, err := mapTarget.StartKey()
if err != nil {
return err
}
if err := vdl.FromValue(keyTarget, key); err != nil {
return err
}
fieldTarget, err := mapTarget.FinishKeyStartField(keyTarget)
if err != nil {
return err
}
if err := vdl.FromValue(fieldTarget, value); err != nil {
return err
}
if err := mapTarget.FinishField(keyTarget, fieldTarget); err != nil {
return err
}
}
if err := target.FinishMap(mapTarget); err != nil {
return err
}
return mtv.modec.Finish()
case vdl.Struct:
// TODO(toddw): See the comment in encoder.mojomStructSize; we rely on the
// fields to be presented in the canonical mojom field ordering.
if !isTopType {
switch ptr, err := mtv.modec.ReadPointer(); {
case err != nil:
return err
case ptr == 0 && isNullable:
return target.FromNil(vdl.OptionalType(vt))
case ptr == 0 && !isNullable:
return fmt.Errorf("invalid null struct pointer")
}
}
_, err := mtv.modec.StartStruct()
if err != nil {
return err
}
targetFields, err := target.StartFields(vt)
if err != nil {
return err
}
for _, alloc := range computeStructLayout(vt) {
mfield := vt.Field(alloc.vdlStructIndex)
switch vkey, vfield, err := targetFields.StartField(mfield.Name); {
// TODO(toddw): Handle err == vdl.ErrFieldNoExist case?
case err != nil:
return err
default:
if err := mtv.transcodeValue(mfield.Type, vfield, false, false); err != nil {
return err
}
if err := targetFields.FinishField(vkey, vfield); err != nil {
return err
}
}
}
// TODO(toddw): Fill in fields that weren't decoded with their zero value.
if err := target.FinishFields(targetFields); err != nil {
return err
}
return mtv.modec.Finish()
case vdl.Union:
size, tag, err := mtv.modec.ReadUnionHeader()
if err != nil {
return err
}
if size == 0 {
mtv.modec.SkipUnionValue()
return target.FromNil(vdl.OptionalType(vt))
}
if int(tag) >= vt.NumField() {
return fmt.Errorf("union tag out of bounds")
}
fld := vt.Field(int(tag))
targetFields, err := target.StartFields(vt)
if err != nil {
return err
}
vKey, vField, err := targetFields.StartField(fld.Name)
if err != nil {
return err
}
if fld.Type.Kind() == vdl.Union {
switch ptr, err := mtv.modec.ReadPointer(); {
case err != nil:
return err
case ptr == 0 && isNullable:
return target.FromNil(vdl.OptionalType(fld.Type))
case ptr == 0 && !isNullable:
return fmt.Errorf("invalid null union pointer")
}
if err := mtv.modec.StartNestedUnion(); err != nil {
return err
}
}
if err := mtv.transcodeValue(fld.Type, vField, false, false); err != nil {
return err
}
if fld.Type.Kind() == vdl.Union {
if err := mtv.modec.Finish(); err != nil {
return err
}
}
if err := targetFields.FinishField(vKey, vField); err != nil {
return err
}
if err := target.FinishFields(targetFields); err != nil {
return err
}
mtv.modec.FinishReadingUnionValue()
return nil
case vdl.Optional:
return mtv.transcodeValue(vt.Elem(), target, false, true)
case vdl.Any:
panic("unimplemented")
//case vdl.TypeObject:
// panic("unimplemented")
default:
panic(fmt.Errorf("decodeValue unhandled vdl type: %v", vt))
}
}