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runtime: introduce unsafe.New and unsafe.NewArray

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to provide functionality previously hacked in to
    reflect and gob.

R=r
https://golang.org/cl/165076
This commit is contained in:
Russ Cox 2009-12-07 15:51:58 -08:00
parent a4a8224152
commit 33649bd278
7 changed files with 78 additions and 37 deletions
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25
src/pkg/reflect/value.go
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@ -595,15 +595,11 @@ func (v *SliceValue) Elem(i int) Value {
// 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 := new(SliceHeader);
size := typ.Elem().Size() * uintptr(cap);
if size == 0 {
size = 1
}
data := make([]uint8, size);
s.Data = uintptr(addr(&data[0]));
s.Len = len;
s.Cap = cap;
s := &SliceHeader{
Data: uintptr(unsafe.NewArray(typ.Elem(), cap)),
Len: len,
Cap: cap,
};
return newValue(typ, addr(s), true).(*SliceValue);
}
@ -1270,13 +1266,8 @@ func newValue(typ Type, addr addr, canSet bool) Value {
// MakeZero returns a zero Value for the specified Type.
func MakeZero(typ Type) Value {
// TODO: this will have to move into
// the runtime proper in order to play nicely
// with the garbage collector.
size := typ.Size();
if size == 0 {
size = 1
if typ == nil {
return nil
}
data := make([]uint8, size);
return newValue(typ, addr(&data[0]), true);
return newValue(typ, addr(unsafe.New(typ)), true);
}