fix(arm): grow slice not clear mem

internal/rt/growslice.go

@@ -20,8 +20,8 @@ package rt
 
 import "unsafe"
 
-func GrowSlice(et *GoType, old GoSlice, cap int) GoSlice {
-	s := growslice(old.Ptr, cap, old.Cap, cap - old.Len, et)
+func GrowSlice(et *GoType, old GoSlice, newLen int) GoSlice {
+	s := growslice(old.Ptr, newLen, old.Cap, newLen - old.Len, et)
 	s.Len = old.Len
 	return s
 }

internal/rt/stubs.go

@@ -127,3 +127,39 @@ func GetMap64Assign(vt reflect.Type) Map64Assign {
 
 var emptyBytes = make([]byte, 0, 0)
 var EmptySlice = *(*GoSlice)(unsafe.Pointer(&emptyBytes))
+
+//go:linkname makeslice runtime.makeslice
+//goland:noinspection GoUnusedParameter
+func makeslice(et *GoType, len int, cap int) unsafe.Pointer
+
+func MakeSlice(oldPtr unsafe.Pointer, et *GoType, newLen int) *GoSlice {
+	if newLen == 0 {
+		return &EmptySlice
+	}
+
+	if *(*unsafe.Pointer)(oldPtr) == nil {
+		return &GoSlice{
+			Ptr: makeslice(et, newLen, newLen),
+			Len: newLen,
+			Cap: newLen,
+		}
+	}
+
+	old := (*GoSlice)(oldPtr)
+	if old.Cap >= newLen {
+		old.Len = newLen
+		return old
+	}
+
+	new := GrowSlice(et, *old, newLen)
+
+	// we sould clear the memory from [oldLen:newLen]
+	if et.PtrData == 0 {
+		oldlenmem := uintptr(old.Len) * et.Size
+		newlenmem := uintptr(newLen) * et.Size
+		MemclrNoHeapPointers(add(new.Ptr, oldlenmem), newlenmem-oldlenmem)
+	}
+
+	new.Len = newLen
+	return &new
+}