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/*******************************************************************************
* Copyright (c) 2009, 2019 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.MethodNode;
import org.objectweb.asm.tree.TypeInsnNode;
import org.objectweb.asm.tree.VarInsnNode;
abstract class AbstractMatcher {
final Map<String, VarInsnNode> vars = new HashMap<String, VarInsnNode>();
AbstractInsnNode cursor;
/**
* Sets {@link #cursor} to first instruction of method if it is
* <code>ALOAD 0</code>, otherwise sets it to <code>null</code>.
*/
final void firstIsALoad0(final MethodNode methodNode) {
cursor = methodNode.instructions.getFirst();
skipNonOpcodes();
if (cursor.getOpcode() == Opcodes.ALOAD
&& ((VarInsnNode) cursor).var == 0) {
return;
}
cursor = null;
}
/**
* Moves {@link #cursor} to next instruction if it is {@link TypeInsnNode}
* with given opcode and operand, otherwise sets it to <code>null</code>.
*/
final void nextIsType(final int opcode, final String desc) {
nextIs(opcode);
if (cursor == null) {
return;
}
if (((TypeInsnNode) cursor).desc.equals(desc)) {
return;
}
cursor = null;
}
/**
* Moves {@link #cursor} to next instruction if it is {@link MethodInsnNode}
* with given opcode, owner, name and descriptor, otherwise sets it to
* <code>null</code>.
*/
final void nextIsInvoke(final int opcode, final String owner,
final String name, final String descriptor) {
nextIs(opcode);
if (cursor == null) {
return;
}
final MethodInsnNode m = (MethodInsnNode) cursor;
if (owner.equals(m.owner) && name.equals(m.name)
&& descriptor.equals(m.desc)) {
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 is
* <code>TABLESWITCH</code> or <code>LOOKUPSWITCH</code>, otherwise sets it
* to <code>null</code>.
*/
final void nextIsSwitch() {
next();
if (cursor == null) {
return;
}
switch (cursor.getOpcode()) {
case Opcodes.TABLESWITCH:
case Opcodes.LOOKUPSWITCH:
return;
default:
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();
}
/**
* Moves {@link #cursor} through {@link AbstractInsnNode#FRAME},
* {@link AbstractInsnNode#LABEL}, {@link AbstractInsnNode#LINE}.
*/
final void skipNonOpcodes() {
cursor = skipNonOpcodes(cursor);
}
/**
* Returns first instruction from given and following it that is not
* {@link AbstractInsnNode#FRAME}, {@link AbstractInsnNode#LABEL},
* {@link AbstractInsnNode#LINE}.
*/
static AbstractInsnNode skipNonOpcodes(AbstractInsnNode cursor) {
while (cursor != null && (cursor.getType() == AbstractInsnNode.FRAME
|| cursor.getType() == AbstractInsnNode.LABEL
|| cursor.getType() == AbstractInsnNode.LINE)) {
cursor = cursor.getNext();
}
return cursor;
}
}
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