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/**
 * Copyright (C) 2010-2018 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see .
 */
/**
 * 
 */
package org.evosuite.instrumentation;

import static org.objectweb.asm.Opcodes.INVOKESTATIC;

import org.evosuite.runtime.classhandling.ClassResetter;
import org.evosuite.runtime.instrumentation.RuntimeInstrumentation;
import org.evosuite.testcase.execution.ExecutionTracer;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;

/**
 * For each PUTSTATIC or GETSTATIC we include a call to
 * ExecutionTracer.passedPutStatic(String,String) passing the class
 * name and the field name of the PUTSTATIC statement.
 *
 * @author Juan Galeotti
 */
public class StaticAccessMethodAdapter extends MethodVisitor {

	private static final String PASSED_PUT_STATIC = "passedPutStatic";
	private static final String PASSED_GET_STATIC = "passedGetStatic";

	private final String className;
	private final String methodName;

	/**
	 * 
	 * Constructor for StaticAccessMethodAdapter.
	 * 
	 *
	 * @param mv
	 *            a {@link org.objectweb.asm.MethodVisitor} object.
	 * @param className
	 *            a {@link java.lang.String} object.
	 */
	public StaticAccessMethodAdapter(String className, String methodName, MethodVisitor mv) {
		super(Opcodes.ASM5, mv);
		this.className = className;
		this.methodName = methodName;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.objectweb.asm.MethodAdapter#visitFieldInsn(int,
	 * java.lang.String, java.lang.String, java.lang.String)
	 */
	/** {@inheritDoc} */
	@Override
	public void visitFieldInsn(int opcode, String owner, String name, String desc) {

		if ((opcode == Opcodes.PUTSTATIC || opcode == Opcodes.GETSTATIC)
				&& !(className.equals(owner) && methodName.equals(""))
				&& !(className.equals(owner) && methodName.equals(ClassResetter.STATIC_RESET))) {

			String classNameWithDots = owner.replace('/', '.');
			if (RuntimeInstrumentation.checkIfCanInstrument(classNameWithDots)) {

				String executionTracerClassName = ExecutionTracer.class.getName().replace('.', '/');
				String executionTracerDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(String.class),
						Type.getType(String.class));

				super.visitLdcInsn(classNameWithDots);
				super.visitLdcInsn(name);
				if (opcode == Opcodes.PUTSTATIC)
					super.visitMethodInsn(INVOKESTATIC, executionTracerClassName, PASSED_PUT_STATIC,
							executionTracerDescriptor, false);
				else
					super.visitMethodInsn(INVOKESTATIC, executionTracerClassName, PASSED_GET_STATIC,
							executionTracerDescriptor, false);
			}
		}
		super.visitFieldInsn(opcode, owner, name, desc);
	}
}