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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:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.flow;
import org.objectweb.asm.tree.AbstractInsnNode;
/**
* Representation of a byte code instruction for analysis. Internally used for
* analysis.
*/
public class Instruction {
private final AbstractInsnNode node;
private final int line;
private int branches;
private int coveredBranches;
private Instruction predecessor;
/**
* New instruction at the given line.
*
* @param node
* corresponding node
* @param line
* source line this instruction belongs to
*/
public Instruction(final AbstractInsnNode node, final int line) {
this.node = node;
this.line = line;
this.branches = 0;
this.coveredBranches = 0;
}
/**
* @return corresponding node
*/
public AbstractInsnNode getNode() {
return node;
}
/**
* Adds an branch to this instruction.
*/
public void addBranch() {
branches++;
}
/**
* Sets the given instruction as a predecessor of this instruction. This
* will add an branch to the predecessor.
*
* @see #addBranch()
* @param predecessor
* predecessor instruction
*/
public void setPredecessor(final Instruction predecessor) {
this.predecessor = predecessor;
predecessor.addBranch();
}
/**
* Marks one branch of this instruction as covered. Also recursively marks
* all predecessor instructions as covered if this is the first covered
* branch.
*/
public void setCovered() {
Instruction i = this;
while (i != null && i.coveredBranches++ == 0) {
i = i.predecessor;
}
}
/**
* Returns the source line this instruction belongs to.
*
* @return corresponding source line
*/
public int getLine() {
return line;
}
/**
* Returns the total number of branches starting from this instruction.
*
* @return total number of branches
*/
public int getBranches() {
return branches;
}
/**
* Returns the number of covered branches starting from this instruction.
*
* @return number of covered branches
*/
public int getCoveredBranches() {
return coveredBranches;
}
}
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