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/*******************************************************************************
* 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;
}
cursor = cursor.getNext();
skipNonOpcodes();
}
final void skipNonOpcodes() {
while (cursor != null && (cursor.getType() == AbstractInsnNode.FRAME
|| cursor.getType() == AbstractInsnNode.LABEL
|| cursor.getType() == AbstractInsnNode.LINE)) {
cursor = cursor.getNext();
}
}
}
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