Add filter for Kotlin default methods (bazelbuild#1012)

org.jacoco.core.test.validation.kotlin/src/org/jacoco/core/test/validation/kotlin/KotlinDefaultMethodsTest.java

@@ -0,0 +1,27 @@
+/*******************************************************************************
+ * Copyright (c) 2009, 2020 Mountainminds GmbH & Co. KG and Contributors
+ * This program and the accompanying materials are made available under
+ * the terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *    Evgeny Mandrikov - initial API and implementation
+ *
+ *******************************************************************************/
+package org.jacoco.core.test.validation.kotlin;
+
+import org.jacoco.core.test.validation.ValidationTestBase;
+import org.jacoco.core.test.validation.kotlin.targets.KotlinDefaultMethodsTarget;
+
+/**
+ * Test of code coverage in {@link KotlinDefaultMethodsTarget}.
+ */
+public class KotlinDefaultMethodsTest extends ValidationTestBase {
+
+	public KotlinDefaultMethodsTest() {
+		super(KotlinDefaultMethodsTarget.class);
+	}
+
+}

org.jacoco.core.test.validation.kotlin/src/org/jacoco/core/test/validation/kotlin/targets/KotlinDefaultMethodsTarget.kt

@@ -0,0 +1,36 @@
+/*******************************************************************************
+ * Copyright (c) 2009, 2020 Mountainminds GmbH & Co. KG and Contributors
+ * This program and the accompanying materials are made available under
+ * the terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *    Evgeny Mandrikov - initial API and implementation
+ *
+ *******************************************************************************/
+package org.jacoco.core.test.validation.kotlin.targets
+
+/**
+ * This test target contains class implementing interface with default methods.
+ */
+object KotlinDefaultMethodsTarget {
+
+    interface I {
+        fun m1() = Unit // assertNotCovered()
+        fun m2() = Unit // assertFullyCovered()
+        fun m3() = Unit // assertNotCovered()
+    }
+
+    class C : I { // assertFullyCovered()
+        override fun m1() = Unit // assertFullyCovered()
+    }
+
+    @JvmStatic
+    fun main(args: Array<String>) {
+        C().m1()
+        C().m2()
+    }
+
+}

org.jacoco.core.test/src/org/jacoco/core/internal/analysis/filter/KotlinDefaultMethodsFilterTest.java

@@ -0,0 +1,86 @@
+/*******************************************************************************
+ * Copyright (c) 2009, 2020 Mountainminds GmbH & Co. KG and Contributors
+ * This program and the accompanying materials are made available under
+ * the terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *    Evgeny Mandrikov - initial API and implementation
+ *
+ *******************************************************************************/
+package org.jacoco.core.internal.analysis.filter;
+
+import org.jacoco.core.internal.instr.InstrSupport;
+import org.junit.Test;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.tree.MethodNode;
+
+/**
+ * Unit test for {@link KotlinDefaultMethodsFilter}.
+ */
+public class KotlinDefaultMethodsFilterTest extends FilterTestBase {
+
+	private final IFilter filter = new KotlinDefaultMethodsFilter();
+
+	@Test
+	public void should_filter() {
+		context.classAnnotations
+				.add(KotlinGeneratedFilter.KOTLIN_METADATA_DESC);
+		final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0,
+				"m", "()V", null, null);
+		m.visitVarInsn(Opcodes.ALOAD, 0);
+		m.visitMethodInsn(Opcodes.INVOKESTATIC, "Target$DefaultImpls", "m",
+				"(LTarget;)V", false);
+		m.visitInsn(Opcodes.RETURN);
+
+		filter.filter(m, context, output);
+
+		assertMethodIgnored(m);
+	}
+
+	@Test
+	public void should_not_filter_when_invokestatic_owner_does_not_match() {
+		context.classAnnotations
+				.add(KotlinGeneratedFilter.KOTLIN_METADATA_DESC);
+		final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0,
+				"m", "()V", null, null);
+		m.visitVarInsn(Opcodes.ALOAD, 0);
+		m.visitMethodInsn(Opcodes.INVOKESTATIC, "Target", "m", "(LTarget;)V",
+				false);
+		m.visitInsn(Opcodes.RETURN);
+
+		filter.filter(m, context, output);
+
+		assertIgnored();
+	}
+
+	@Test
+	public void should_not_filter_when_instructions_do_not_match() {
+		context.classAnnotations
+				.add(KotlinGeneratedFilter.KOTLIN_METADATA_DESC);
+		final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0,
+				"m", "()V", null, null);
+		m.visitInsn(Opcodes.RETURN);
+
+		filter.filter(m, context, output);
+
+		assertIgnored();
+	}
+
+	@Test
+	public void should_not_filter_when_not_kotlin() {
+		final MethodNode m = new MethodNode(InstrSupport.ASM_API_VERSION, 0,
+				"m", "()V", null, null);
+		m.visitVarInsn(Opcodes.ALOAD, 0);
+		m.visitMethodInsn(Opcodes.INVOKESTATIC, "Target$DefaultImpls", "m",
+				"(LTarget;)V", false);
+		m.visitInsn(Opcodes.RETURN);
+
+		filter.filter(m, context, output);
+
+		assertIgnored();
+	}
+
+}

org.jacoco.core/src/org/jacoco/core/internal/analysis/filter/Filters.java

@@ -46,7 +46,7 @@ public static IFilter all() {
 				new KotlinUnsafeCastOperatorFilter(),
 				new KotlinNotNullOperatorFilter(),
 				new KotlinDefaultArgumentsFilter(), new KotlinInlineFilter(),
-				new KotlinCoroutineFilter());
+				new KotlinCoroutineFilter(), new KotlinDefaultMethodsFilter());
 	}
 
 	private Filters(final IFilter... filters) {

org.jacoco.core/src/org/jacoco/core/internal/analysis/filter/KotlinDefaultMethodsFilter.java

@@ -0,0 +1,46 @@
+/*******************************************************************************
+ * Copyright (c) 2009, 2020 Mountainminds GmbH & Co. KG and Contributors
+ * This program and the accompanying materials are made available under
+ * the terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *    Evgeny Mandrikov - initial API and implementation
+ *
+ *******************************************************************************/
+package org.jacoco.core.internal.analysis.filter;
+
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.tree.MethodInsnNode;
+import org.objectweb.asm.tree.MethodNode;
+
+/**
+ * Filters methods that Kotlin compiler generates for non-overridden
+ * non-abstract methods of interfaces.
+ */
+final class KotlinDefaultMethodsFilter implements IFilter {
+
+	public void filter(final MethodNode methodNode,
+			final IFilterContext context, final IFilterOutput output) {
+		if (!KotlinGeneratedFilter.isKotlinClass(context)) {
+			return;
+		}
+		new Matcher().match(methodNode, output);
+	}
+
+	private static class Matcher extends AbstractMatcher {
+		private void match(final MethodNode methodNode,
+				final IFilterOutput output) {
+			firstIsALoad0(methodNode);
+			nextIs(Opcodes.INVOKESTATIC);
+			if (cursor != null && ((MethodInsnNode) cursor).owner
+					.endsWith("$DefaultImpls")) {
+				output.ignore(methodNode.instructions.getFirst(),
+						methodNode.instructions.getLast());
+			}
+		}
+	}
+
+}

org.jacoco.doc/docroot/doc/changes.html

@@ -29,6 +29,9 @@ <h3>New Features</h3>
       (GitHub <a href="https://github.com/jacoco/jacoco/issues/990">#990</a>).</li>
   <li>Bridge methods are filtered out during generation of report
       (GitHub <a href="https://github.com/jacoco/jacoco/issues/1010">#1010</a>).</li>
+  <li>Methods generated by Kotlin compiler for non-overridden non-abstract methods
+      of interfaces are filtered out during generation of report
+      (GitHub <a href="https://github.com/jacoco/jacoco/issues/1012">#1012</a>).</li>
 </ul>
 
 <h3>Non-functional Changes</h3>