// MakeSlice creates a new zero-initialized slice value
// for the specified slice type, length, and capacity.
func MakeSlice(typ *SliceType, len, cap int) *SliceValue {
s := &SliceHeader{
Data: uintptr(unsafe.NewArray(typ.Elem(), cap)),
Len: len,
Cap: cap,
}
return newValue(typ, addr(s), true).(*SliceValue)
}
// MakeSlice creates a new zero-initialized slice value
// for the specified slice type, length, and capacity.
func MakeSlice(typ Type, len, cap int) Value {
if typ.Kind() != Slice {
panic("reflect: MakeSlice of non-slice type")
}
s := &SliceHeader{
Data: uintptr(unsafe.NewArray(typ.Elem(), cap)),
Len: len,
Cap: cap,
}
return valueFromAddr(0, typ, unsafe.Pointer(s))
}
// MakeSlice creates a new zero-initialized slice value
// for the specified slice type, length, and capacity.
func MakeSlice(typ Type, len, cap int) Value {
if typ.Kind() != Slice {
panic("reflect.MakeSlice of non-slice type")
}
// Declare slice so that gc can see the base pointer in it.
var x []byte
// Reinterpret as *SliceHeader to edit.
s := (*SliceHeader)(unsafe.Pointer(&x))
s.Data = uintptr(unsafe.NewArray(typ.Elem(), cap))
s.Len = len
s.Cap = cap
return Value{typ.common(), unsafe.Pointer(&x), flagIndir | flag(Slice)<<flagKindShift}
}
func (dec *Decoder) decodeSlice(atyp *reflect.SliceType, state *decodeState, p uintptr, elemOp decOp, elemWid uintptr, indir, elemIndir int, ovfl os.ErrorString) {
n := int(uintptr(state.decodeUint()))
if indir > 0 {
up := unsafe.Pointer(p)
if *(*unsafe.Pointer)(up) == nil {
// Allocate the slice header.
*(*unsafe.Pointer)(up) = unsafe.Pointer(new([]unsafe.Pointer))
}
p = *(*uintptr)(up)
}
// Allocate storage for the slice elements, that is, the underlying array.
// Always write a header at p.
hdrp := (*reflect.SliceHeader)(unsafe.Pointer(p))
hdrp.Data = uintptr(unsafe.NewArray(atyp.Elem(), n))
hdrp.Len = n
hdrp.Cap = n
dec.decodeArrayHelper(state, hdrp.Data, elemOp, elemWid, n, elemIndir, ovfl)
}