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package reflect2
import (
"reflect"
"unsafe"
)
// sliceHeader is a safe version of SliceHeader used within this package.
type sliceHeader struct {
Data unsafe.Pointer
Len int
Cap int
}
type UnsafeSliceType struct {
unsafeType
elemRType unsafe.Pointer
pElemRType unsafe.Pointer
elemSize uintptr
}
func newUnsafeSliceType(cfg *frozenConfig, type1 reflect.Type) SliceType {
elemType := type1.Elem()
return &UnsafeSliceType{
unsafeType: *newUnsafeType(cfg, type1),
pElemRType: unpackEFace(reflect.PtrTo(elemType)).data,
elemRType: unpackEFace(elemType).data,
elemSize: elemType.Size(),
}
}
func (type2 *UnsafeSliceType) Set(obj interface{}, val interface{}) {
objEFace := unpackEFace(obj)
assertType("Type.Set argument 1", type2.ptrRType, objEFace.rtype)
valEFace := unpackEFace(val)
assertType("Type.Set argument 2", type2.ptrRType, valEFace.rtype)
type2.UnsafeSet(objEFace.data, valEFace.data)
}
func (type2 *UnsafeSliceType) UnsafeSet(ptr unsafe.Pointer, val unsafe.Pointer) {
*(*sliceHeader)(ptr) = *(*sliceHeader)(val)
}
func (type2 *UnsafeSliceType) IsNil(obj interface{}) bool {
if obj == nil {
return true
}
objEFace := unpackEFace(obj)
assertType("Type.IsNil argument 1", type2.ptrRType, objEFace.rtype)
return type2.UnsafeIsNil(objEFace.data)
}
func (type2 *UnsafeSliceType) UnsafeIsNil(ptr unsafe.Pointer) bool {
if ptr == nil {
return true
}
return (*sliceHeader)(ptr).Data == nil
}
func (type2 *UnsafeSliceType) SetNil(obj interface{}) {
objEFace := unpackEFace(obj)
assertType("SliceType.SetNil argument 1", type2.ptrRType, objEFace.rtype)
type2.UnsafeSetNil(objEFace.data)
}
func (type2 *UnsafeSliceType) UnsafeSetNil(ptr unsafe.Pointer) {
header := (*sliceHeader)(ptr)
header.Len = 0
header.Cap = 0
header.Data = nil
}
func (type2 *UnsafeSliceType) MakeSlice(length int, cap int) interface{} {
return packEFace(type2.ptrRType, type2.UnsafeMakeSlice(length, cap))
}
func (type2 *UnsafeSliceType) UnsafeMakeSlice(length int, cap int) unsafe.Pointer {
header := &sliceHeader{unsafe_NewArray(type2.elemRType, cap), length, cap}
return unsafe.Pointer(header)
}
func (type2 *UnsafeSliceType) LengthOf(obj interface{}) int {
objEFace := unpackEFace(obj)
assertType("SliceType.Len argument 1", type2.ptrRType, objEFace.rtype)
return type2.UnsafeLengthOf(objEFace.data)
}
func (type2 *UnsafeSliceType) UnsafeLengthOf(obj unsafe.Pointer) int {
header := (*sliceHeader)(obj)
return header.Len
}
func (type2 *UnsafeSliceType) SetIndex(obj interface{}, index int, elem interface{}) {
objEFace := unpackEFace(obj)
assertType("SliceType.SetIndex argument 1", type2.ptrRType, objEFace.rtype)
elemEFace := unpackEFace(elem)
assertType("SliceType.SetIndex argument 3", type2.pElemRType, elemEFace.rtype)
type2.UnsafeSetIndex(objEFace.data, index, elemEFace.data)
}
func (type2 *UnsafeSliceType) UnsafeSetIndex(obj unsafe.Pointer, index int, elem unsafe.Pointer) {
header := (*sliceHeader)(obj)
elemPtr := arrayAt(header.Data, index, type2.elemSize, "i < s.Len")
typedmemmove(type2.elemRType, elemPtr, elem)
}
func (type2 *UnsafeSliceType) GetIndex(obj interface{}, index int) interface{} {
objEFace := unpackEFace(obj)
assertType("SliceType.GetIndex argument 1", type2.ptrRType, objEFace.rtype)
elemPtr := type2.UnsafeGetIndex(objEFace.data, index)
return packEFace(type2.pElemRType, elemPtr)
}
func (type2 *UnsafeSliceType) UnsafeGetIndex(obj unsafe.Pointer, index int) unsafe.Pointer {
header := (*sliceHeader)(obj)
return arrayAt(header.Data, index, type2.elemSize, "i < s.Len")
}
func (type2 *UnsafeSliceType) Append(obj interface{}, elem interface{}) {
objEFace := unpackEFace(obj)
assertType("SliceType.Append argument 1", type2.ptrRType, objEFace.rtype)
elemEFace := unpackEFace(elem)
assertType("SliceType.Append argument 2", type2.pElemRType, elemEFace.rtype)
type2.UnsafeAppend(objEFace.data, elemEFace.data)
}
func (type2 *UnsafeSliceType) UnsafeAppend(obj unsafe.Pointer, elem unsafe.Pointer) {
header := (*sliceHeader)(obj)
oldLen := header.Len
type2.UnsafeGrow(obj, oldLen+1)
type2.UnsafeSetIndex(obj, oldLen, elem)
}
func (type2 *UnsafeSliceType) Cap(obj interface{}) int {
objEFace := unpackEFace(obj)
assertType("SliceType.Cap argument 1", type2.ptrRType, objEFace.rtype)
return type2.UnsafeCap(objEFace.data)
}
func (type2 *UnsafeSliceType) UnsafeCap(ptr unsafe.Pointer) int {
return (*sliceHeader)(ptr).Cap
}
func (type2 *UnsafeSliceType) Grow(obj interface{}, newLength int) {
objEFace := unpackEFace(obj)
assertType("SliceType.Grow argument 1", type2.ptrRType, objEFace.rtype)
type2.UnsafeGrow(objEFace.data, newLength)
}
func (type2 *UnsafeSliceType) UnsafeGrow(obj unsafe.Pointer, newLength int) {
header := (*sliceHeader)(obj)
if newLength <= header.Cap {
header.Len = newLength
return
}
newCap := calcNewCap(header.Cap, newLength)
newHeader := (*sliceHeader)(type2.UnsafeMakeSlice(header.Len, newCap))
typedslicecopy(type2.elemRType, *newHeader, *header)
header.Data = newHeader.Data
header.Cap = newHeader.Cap
header.Len = newLength
}
func calcNewCap(cap int, expectedCap int) int {
if cap == 0 {
cap = expectedCap
} else {
for cap < expectedCap {
if cap < 1024 {
cap += cap
} else {
cap += cap / 4
}
}
}
return cap
}
|
