Add a regression test for inlining of recursive methods
Bug: 145276800
Change-Id: I063c620e4edd7804250cb9166e95240e9556fdc5
diff --git a/src/test/java/com/android/tools/r8/ir/optimize/inliner/AvoidInliningRecursiveMethodTest.java b/src/test/java/com/android/tools/r8/ir/optimize/inliner/AvoidInliningRecursiveMethodTest.java
new file mode 100644
index 0000000..3a501a6
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/ir/optimize/inliner/AvoidInliningRecursiveMethodTest.java
@@ -0,0 +1,79 @@
+// 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.ir.optimize.inliner;
+
+import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.assertTrue;
+
+import com.android.tools.r8.NeverInline;
+import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.TestParametersCollection;
+import com.android.tools.r8.utils.codeinspector.ClassSubject;
+import com.android.tools.r8.utils.codeinspector.CodeInspector;
+import com.android.tools.r8.utils.codeinspector.InstructionSubject;
+import com.android.tools.r8.utils.codeinspector.MethodSubject;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+@RunWith(Parameterized.class)
+public class AvoidInliningRecursiveMethodTest extends TestBase {
+
+ private final TestParameters parameters;
+
+ @Parameterized.Parameters(name = "{0}")
+ public static TestParametersCollection data() {
+ return getTestParameters().withAllRuntimesAndApiLevels().build();
+ }
+
+ public AvoidInliningRecursiveMethodTest(TestParameters parameters) {
+ this.parameters = parameters;
+ }
+
+ @Test
+ public void test() throws Exception {
+ testForR8(parameters.getBackend())
+ .addInnerClasses(AvoidInliningRecursiveMethodTest.class)
+ .addKeepMainRule(TestClass.class)
+ .enableInliningAnnotations()
+ .setMinApi(parameters.getApiLevel())
+ .compile()
+ .inspect(this::inspect)
+ .run(parameters.getRuntime(), TestClass.class)
+ .assertSuccessWithOutputLines("Hello world!");
+ }
+
+ private void inspect(CodeInspector inspector) {
+ ClassSubject classSubject = inspector.clazz(TestClass.class);
+ assertThat(classSubject, isPresent());
+
+ MethodSubject mainMethodSubject = classSubject.mainMethod();
+ assertThat(mainMethodSubject, isPresent());
+
+ // TODO(b/145276800): Should not inline recursive methods.
+ assertTrue(mainMethodSubject.streamInstructions().anyMatch(InstructionSubject::isIf));
+ }
+
+ static class TestClass {
+
+ public static void main(String[] args) {
+ System.out.println(recursive(getInt()));
+ }
+
+ @NeverInline
+ static int getInt() {
+ return System.currentTimeMillis() >= 0 ? 42 : 0;
+ }
+
+ static String recursive(int x) {
+ if (x > 0) {
+ return recursive(x - 1);
+ }
+ return "Hello world!";
+ }
+ }
+}
