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// Copyright (c) 2019, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
package com.android.tools.r8.resolution.access;
import static com.android.tools.r8.TestRuntime.CfVm.JDK11;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestRunResult;
import com.android.tools.r8.graph.AppInfoWithClassHierarchy;
import com.android.tools.r8.graph.AppView;
import com.android.tools.r8.graph.DexClass;
import com.android.tools.r8.graph.DexClassAndMethod;
import com.android.tools.r8.graph.DexMethod;
import com.android.tools.r8.graph.DexProgramClass;
import com.android.tools.r8.graph.ResolutionResult;
import com.android.tools.r8.references.Reference;
import com.android.tools.r8.transformers.ClassFileTransformer;
import com.android.tools.r8.utils.BooleanUtils;
import com.android.tools.r8.utils.OptionalBool;
import com.android.tools.r8.utils.StringUtils;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import com.android.tools.r8.utils.codeinspector.MethodSubject;
import com.google.common.collect.ImmutableList;
import java.util.Collection;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
@RunWith(Parameterized.class)
public class NestInvokeSpecialMethodAccessTest extends TestBase {
static final String EXPECTED = StringUtils.lines("A::bar");
private final TestParameters parameters;
private final boolean inSameNest;
@Parameterized.Parameters(name = "{0}, in-same-nest:{1}")
public static List<Object[]> data() {
return buildParameters(
getTestParameters()
.withCfRuntimesStartingFromIncluding(JDK11)
.withDexRuntimes()
.withAllApiLevels()
.build(),
BooleanUtils.values());
}
public NestInvokeSpecialMethodAccessTest(TestParameters parameters, boolean inSameNest) {
this.parameters = parameters;
this.inSameNest = inSameNest;
}
private Collection<Class<?>> getClasses() {
return ImmutableList.of(Main.class);
}
private Collection<byte[]> getTransformedClasses() throws Exception {
return ImmutableList.of(
withNest(A.class).setPrivate(A.class.getDeclaredMethod("bar")).transform(),
withNest(B.class).transform());
}
private ClassFileTransformer withNest(Class<?> clazz) throws Exception {
if (inSameNest) {
// If in the same nest make A host and B a member.
return transformer(clazz).setNest(A.class, B.class);
}
// Otherwise, set the class to be its own host and no additional members.
return transformer(clazz).setNest(clazz);
}
@Test
public void testResolutionAccess() throws Exception {
// White-box test of the R8 resolution and lookup methods.
Class<?> definingClass = A.class;
Class<?> declaredClass = A.class;
Class<?> callerClass = B.class;
AppView<AppInfoWithClassHierarchy> appView = getAppView();
AppInfoWithClassHierarchy appInfo = appView.appInfo();
DexClass definingClassDefinition = getDexProgramClass(definingClass, appView);
DexClass declaredClassDefinition = getDexProgramClass(declaredClass, appView);
DexProgramClass callerClassDefinition = getDexProgramClass(callerClass, appView);
DexMethod method = getTargetMethodSignature(declaredClass, appView);
assertCallingClassCallsTarget(callerClass, appView, method);
// Resolve the method from the point of the declared holder.
assertEquals(method.holder, declaredClassDefinition.type);
ResolutionResult resolutionResult = appInfo.resolveMethodOn(declaredClassDefinition, method);
// Verify that the resolved method is on the defining class.
assertEquals(
definingClassDefinition, resolutionResult.asSingleResolution().getResolvedHolder());
// Verify that the resolved method is accessible if in the same nest.
assertEquals(
OptionalBool.of(inSameNest),
resolutionResult.isAccessibleFrom(callerClassDefinition, appInfo));
// Verify that looking up the dispatch target returns the defining method.
DexClassAndMethod targetSpecial =
resolutionResult.lookupInvokeSpecialTarget(callerClassDefinition, appInfo);
DexClassAndMethod targetSuper =
resolutionResult.lookupInvokeSuperTarget(callerClassDefinition, appInfo);
if (inSameNest) {
assertEquals(definingClassDefinition.type, targetSpecial.getHolderType());
assertEquals(targetSpecial.getReference(), targetSuper.getReference());
} else {
assertNull(targetSpecial);
assertNull(targetSuper);
}
}
private void assertCallingClassCallsTarget(
Class<?> callerClass, AppView<?> appView, DexMethod target) {
CodeInspector inspector = new CodeInspector(appView.appInfo().app());
MethodSubject foo = inspector.clazz(callerClass).uniqueMethodWithName("foo");
assertTrue(
foo.streamInstructions().anyMatch(i -> i.isInvokeSpecial() && i.getMethod() == target));
}
private DexMethod getTargetMethodSignature(Class<?> declaredClass, AppView<?> appView) {
return buildMethod(
Reference.method(Reference.classFromClass(declaredClass), "bar", ImmutableList.of(), null),
appView.dexItemFactory());
}
private DexProgramClass getDexProgramClass(Class<?> definingClass, AppView<?> appView) {
return appView
.definitionFor(buildType(definingClass, appView.dexItemFactory()))
.asProgramClass();
}
private AppView<AppInfoWithClassHierarchy> getAppView() throws Exception {
return computeAppViewWithClassHierachy(
buildClasses(getClasses()).addClassProgramData(getTransformedClasses()).build());
}
@Test
public void test() throws Exception {
testForRuntime(parameters)
.addProgramClasses(getClasses())
.addProgramClassFileData(getTransformedClasses())
.run(parameters.getRuntime(), Main.class)
.apply(this::checkExpectedResult);
}
@Test
public void testR8() throws Exception {
testForR8(parameters.getBackend())
.addProgramClasses(getClasses())
.addProgramClassFileData(getTransformedClasses())
.setMinApi(parameters.getApiLevel())
.addKeepMainRule(Main.class)
.run(parameters.getRuntime(), Main.class)
.apply(this::checkExpectedResult);
}
private void checkExpectedResult(TestRunResult<?> result) {
if (inSameNest) {
result.assertSuccessWithOutput(EXPECTED);
} else {
result.assertFailureWithErrorThatThrows(IllegalAccessError.class);
}
}
static class A {
/* will be private */ void bar() {
System.out.println("A::bar");
}
}
static class B extends A {
public void foo() {
// invoke-special to private method.
super.bar();
}
}
static class Main {
public static void main(String[] args) {
new B().foo();
}
}
}