Add filter for try-with-resources statement (#500)

1 files changed, 83 insertions, 0 deletions

diff --git a/org.jacoco.core/src/org/jacoco/core/internal/analysis/filter/AbstractMatcher.java b/org.jacoco.core/src/org/jacoco/core/internal/analysis/filter/AbstractMatcher.java
new file mode 100644
index 00000000..e4958bdb
--- /dev/null
+++ b/org.jacoco.core/src/org/jacoco/core/internal/analysis/filter/AbstractMatcher.java
@@ -0,0 +1,83 @@
+/*******************************************************************************
+ * Copyright (c) 2009, 2017 Mountainminds GmbH & Co. KG and Contributors
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Evgeny Mandrikov - initial API and implementation
+ *
+ *******************************************************************************/
+package org.jacoco.core.internal.analysis.filter;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.tree.AbstractInsnNode;
+import org.objectweb.asm.tree.MethodInsnNode;
+import org.objectweb.asm.tree.VarInsnNode;
+
+abstract class AbstractMatcher {
+
+	final Map<String, VarInsnNode> vars = new HashMap<String, VarInsnNode>();
+
+	AbstractInsnNode cursor;
+
+	final void nextIsAddSuppressed() {
+		nextIs(Opcodes.INVOKEVIRTUAL);
+		if (cursor == null) {
+			return;
+		}
+		final MethodInsnNode m = (MethodInsnNode) cursor;
+		if ("java/lang/Throwable".equals(m.owner)
+				&& "addSuppressed".equals(m.name)) {
+			return;
+		}
+		cursor = null;
+	}
+
+	final void nextIsVar(final int opcode, final String name) {
+		nextIs(opcode);
+		if (cursor == null) {
+			return;
+		}
+		final VarInsnNode actual = (VarInsnNode) cursor;
+		final VarInsnNode expected = vars.get(name);
+		if (expected == null) {
+			vars.put(name, actual);
+		} else if (expected.var != actual.var) {
+			cursor = null;
+		}
+	}
+
+	/**
+	 * Moves {@link #cursor} to next instruction if it has given opcode,
+	 * otherwise sets it to <code>null</code>.
+	 */
+	final void nextIs(final int opcode) {
+		next();
+		if (cursor == null) {
+			return;
+		}
+		if (cursor.getOpcode() != opcode) {
+			cursor = null;
+		}
+	}
+
+	/**
+	 * Moves {@link #cursor} to next instruction.
+	 */
+	final void next() {
+		if (cursor == null) {
+			return;
+		}
+		do {
+			cursor = cursor.getNext();
+		} while (cursor != null && (cursor.getType() == AbstractInsnNode.FRAME
+				|| cursor.getType() == AbstractInsnNode.LABEL
+				|| cursor.getType() == AbstractInsnNode.LINE));
+	}
+
+}