internal/lib/reflect: Value.IsZero

internal/lib/reflect/value.go

@@ -22,6 +22,7 @@ package reflect
 
 import (
 	"errors"
+	"math"
 	"unsafe"
 
 	"github.com/goplus/llgo/c/bitcast"
@@ -843,7 +844,6 @@ func (v Value) IsValid() bool {
 // IsZero reports whether v is the zero value for its type.
 // It panics if the argument is invalid.
 func (v Value) IsZero() bool {
-	/*
 	switch v.kind() {
 	case Bool:
 		return !v.Bool()
@@ -901,8 +901,6 @@ func (v Value) IsZero() bool {
 		// as a default value doesn't makes sense here.
 		panic(&ValueError{"reflect.Value.IsZero", v.Kind()})
 	}
-	*/
-	panic("todo: reflect.Value.IsZero")
 }
 
 // SetZero sets v to be the zero value of v's type.
@@ -1793,6 +1791,9 @@ func Zero(typ Type) Value {
 // must match declarations in runtime/map.go.
 const maxZero = runtime.MaxZero
 
+//go:linkname zeroVal runtime.ZeroVal
+var zeroVal [maxZero]byte
+
 // New returns a Value representing a pointer to a new zero value
 // for the specified type. That is, the returned Value's Type is PointerTo(typ).
 func New(typ Type) Value {