github.com/modern-go/reflect2@v1.0.2/unsafe_array.go (about)

     1  package reflect2
     2  
     3  import (
     4  	"reflect"
     5  	"unsafe"
     6  )
     7  
     8  type UnsafeArrayType struct {
     9  	unsafeType
    10  	elemRType  unsafe.Pointer
    11  	pElemRType unsafe.Pointer
    12  	elemSize   uintptr
    13  	likePtr    bool
    14  }
    15  
    16  func newUnsafeArrayType(cfg *frozenConfig, type1 reflect.Type) *UnsafeArrayType {
    17  	return &UnsafeArrayType{
    18  		unsafeType: *newUnsafeType(cfg, type1),
    19  		elemRType:  unpackEFace(type1.Elem()).data,
    20  		pElemRType: unpackEFace(reflect.PtrTo(type1.Elem())).data,
    21  		elemSize:   type1.Elem().Size(),
    22  		likePtr:    likePtrType(type1),
    23  	}
    24  }
    25  
    26  func (type2 *UnsafeArrayType) LikePtr() bool {
    27  	return type2.likePtr
    28  }
    29  
    30  func (type2 *UnsafeArrayType) Indirect(obj interface{}) interface{} {
    31  	objEFace := unpackEFace(obj)
    32  	assertType("Type.Indirect argument 1", type2.ptrRType, objEFace.rtype)
    33  	return type2.UnsafeIndirect(objEFace.data)
    34  }
    35  
    36  func (type2 *UnsafeArrayType) UnsafeIndirect(ptr unsafe.Pointer) interface{} {
    37  	if type2.likePtr {
    38  		return packEFace(type2.rtype, *(*unsafe.Pointer)(ptr))
    39  	}
    40  	return packEFace(type2.rtype, ptr)
    41  }
    42  
    43  func (type2 *UnsafeArrayType) SetIndex(obj interface{}, index int, elem interface{}) {
    44  	objEFace := unpackEFace(obj)
    45  	assertType("ArrayType.SetIndex argument 1", type2.ptrRType, objEFace.rtype)
    46  	elemEFace := unpackEFace(elem)
    47  	assertType("ArrayType.SetIndex argument 3", type2.pElemRType, elemEFace.rtype)
    48  	type2.UnsafeSetIndex(objEFace.data, index, elemEFace.data)
    49  }
    50  
    51  func (type2 *UnsafeArrayType) UnsafeSetIndex(obj unsafe.Pointer, index int, elem unsafe.Pointer) {
    52  	elemPtr := arrayAt(obj, index, type2.elemSize, "i < s.Len")
    53  	typedmemmove(type2.elemRType, elemPtr, elem)
    54  }
    55  
    56  func (type2 *UnsafeArrayType) GetIndex(obj interface{}, index int) interface{} {
    57  	objEFace := unpackEFace(obj)
    58  	assertType("ArrayType.GetIndex argument 1", type2.ptrRType, objEFace.rtype)
    59  	elemPtr := type2.UnsafeGetIndex(objEFace.data, index)
    60  	return packEFace(type2.pElemRType, elemPtr)
    61  }
    62  
    63  func (type2 *UnsafeArrayType) UnsafeGetIndex(obj unsafe.Pointer, index int) unsafe.Pointer {
    64  	return arrayAt(obj, index, type2.elemSize, "i < s.Len")
    65  }