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// Copyright (C) 2016 The Android Open Source Project
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package analysis
import (
// Value interface compliance checks.
var (
_ = Value(&UntrackedValue{})
_ = fieldHolder(&UntrackedValue{})
// UntrackedValue is an implementation of Value used for types that are not
// tracked by static analysis.
type UntrackedValue struct {
// Ty is the type of the untracked value.
Ty semantic.Type
// Print returns "<untracked>"
func (v *UntrackedValue) Print(*Results) string { return "<untracked>" }
// Type returns the semantic type of the untracked value.
func (v *UntrackedValue) Type() semantic.Type { return v.Ty }
// Equivalent returns true.
func (v *UntrackedValue) Equivalent(Value) bool { return true }
// Equals returns Maybe.
func (v *UntrackedValue) Equals(Value) Possibility { return Maybe }
// Valid returns true.
func (v *UntrackedValue) Valid() bool { return true }
// Union returns a new pointer to a UntrackedValue.
func (v *UntrackedValue) Union(o Value) Value { return v.Clone() }
// Intersect returns a new pointer to a UntrackedValue.
func (v *UntrackedValue) Intersect(o Value) Value { return v.Clone() }
// Difference returns a new pointer to a UntrackedValue.
func (v *UntrackedValue) Difference(o Value) Value { return v.Clone() }
// Clone returns a new pointer to a UntrackedValue.
func (v *UntrackedValue) Clone() Value { return &UntrackedValue{v.Ty} }
// field returns an unknown value of the field type.
func (v UntrackedValue) field(s *scope, name string) Value {
switch ty := semantic.Underlying(v.Ty).(type) {
case *semantic.Class:
for _, f := range ty.Fields {
if f.Name() == name {
return s.unknownOf(f.Type)
case *semantic.Reference:
return UntrackedValue{ty.To}.field(s, name)
panic(fmt.Errorf("Type %v does not contain fields", v.Ty.Name()))
// setField simply returns a new a UntrackedValue.
func (v *UntrackedValue) setField(s *scope, name string, val Value) Value {
return v.Clone()