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package reflect
// Not an actual implementation of DeepEqual. This is a model that supports
// the bare minimum needed to get through testing interp.
//
// Does not handle cycles.
//
// Note: unclear if reflect.go can support this.
func DeepEqual(x, y interface{}) bool {
if x == nil || y == nil {
return x == y
}
v1 := ValueOf(x)
v2 := ValueOf(y)
return deepValueEqual(v1, v2, make(map[visit]bool))
}
// Key for the visitedMap in deepValueEqual.
type visit struct {
a1, a2 uintptr
typ Type
}
func deepValueEqual(v1, v2 Value, visited map[visit]bool) bool {
if !v1.IsValid() || !v2.IsValid() {
return v1.IsValid() == v2.IsValid()
}
if v1.Type() != v2.Type() {
return false
}
// Short circuit on reference types that can lead to cycles in comparison.
switch v1.Kind() {
case Pointer, Map, Slice, Interface:
k := visit{v1.Pointer(), v2.Pointer(), v1.Type()} // Not safe for moving GC.
if visited[k] {
// The comparison algorithm assumes that all checks in progress are true when it reencounters them.
return true
}
visited[k] = true
}
switch v1.Kind() {
case Array:
for i := 0; i < v1.Len(); i++ {
if !deepValueEqual(v1.Index(i), v2.Index(i), visited) {
return false
}
}
return true
case Slice:
if v1.IsNil() != v2.IsNil() {
return false
}
if v1.Len() != v2.Len() {
return false
}
if v1.Pointer() == v2.Pointer() {
return true
}
for i := 0; i < v1.Len(); i++ {
if !deepValueEqual(v1.Index(i), v2.Index(i), visited) {
return false
}
}
return true
case Interface:
if v1.IsNil() || v2.IsNil() {
return v1.IsNil() == v2.IsNil()
}
return deepValueEqual(v1.Elem(), v2.Elem(), visited)
case Ptr:
if v1.Pointer() == v2.Pointer() {
return true
}
return deepValueEqual(v1.Elem(), v2.Elem(), visited)
case Struct:
for i, n := 0, v1.NumField(); i < n; i++ {
if !deepValueEqual(v1.Field(i), v2.Field(i), visited) {
return false
}
}
return true
case Map:
if v1.IsNil() != v2.IsNil() {
return false
}
if v1.Len() != v2.Len() {
return false
}
if v1.Pointer() == v2.Pointer() {
return true
}
for _, k := range v1.MapKeys() {
val1 := v1.MapIndex(k)
val2 := v2.MapIndex(k)
if !val1.IsValid() || !val2.IsValid() || !deepValueEqual(val1, val2, visited) {
return false
}
}
return true
case Func:
return v1.IsNil() && v2.IsNil()
default:
// Normal equality suffices
return v1.Interface() == v2.Interface() // try interface comparison as a fallback.
}
}
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