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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 java.util.HashMap;
import java.util.Map;

import org.evosuite.PackageInfo;
import org.evosuite.Properties;
import org.evosuite.testcase.execution.TestCaseExecutor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.GeneratorAdapter;


/**
 * ArrayAllocationLimitMethodAdapter class.
 *
 * @author Gordon Fraser
 */
public class ArrayAllocationLimitMethodAdapter extends GeneratorAdapter {

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

	/* (non-Javadoc)
	 * @see org.objectweb.asm.MethodVisitor#visitIntInsn(int, int)
	 */
	/** {@inheritDoc} */
	@Override
	public void visitIntInsn(int opcode, int operand) {
		if (opcode == Opcodes.NEWARRAY) {
			Label origTarget = new Label();
			visitInsn(Opcodes.DUP);
			visitFieldInsn(Opcodes.GETSTATIC, PackageInfo.getNameWithSlash(org.evosuite.Properties.class),
			               "ARRAY_LIMIT", "I");
			super.visitJumpInsn(Opcodes.IF_ICMPLT, origTarget);
			super.visitTypeInsn(Opcodes.NEW,
					PackageInfo.getNameWithSlash(TestCaseExecutor.TimeoutExceeded.class));
			super.visitInsn(Opcodes.DUP);
			super.visitMethodInsn(Opcodes.INVOKESPECIAL,
					PackageInfo.getNameWithSlash(TestCaseExecutor.TimeoutExceeded.class),
			                      "", "()V", false);
			super.visitInsn(Opcodes.ATHROW);
			super.visitLabel(origTarget);

		}
		super.visitIntInsn(opcode, operand);
	}

	/* (non-Javadoc)
	 * @see org.objectweb.asm.MethodVisitor#visitTypeInsn(int, java.lang.String)
	 */
	/** {@inheritDoc} */
	@Override
	public void visitTypeInsn(int opcode, String type) {

		if (opcode == Opcodes.ANEWARRAY) {
			Label origTarget = new Label();
			visitInsn(Opcodes.DUP);
			visitFieldInsn(Opcodes.GETSTATIC, PackageInfo.getNameWithSlash(org.evosuite.Properties.class),
			               "ARRAY_LIMIT", "I");
			super.visitJumpInsn(Opcodes.IF_ICMPLT, origTarget);
			super.visitTypeInsn(Opcodes.NEW,
					PackageInfo.getNameWithSlash(TestCaseExecutor.TimeoutExceeded.class));
			super.visitInsn(Opcodes.DUP);
			super.visitMethodInsn(Opcodes.INVOKESPECIAL,
					PackageInfo.getNameWithSlash(TestCaseExecutor.TimeoutExceeded.class),
			                      "", "()V", false);
			super.visitInsn(Opcodes.ATHROW);
			super.visitLabel(origTarget);

		}
		super.visitTypeInsn(opcode, type);
	}

	/* (non-Javadoc)
	 * @see org.objectweb.asm.MethodVisitor#visitMultiANewArrayInsn(java.lang.String, int)
	 */
	/** {@inheritDoc} */
	@Override
	public void visitMultiANewArrayInsn(String desc, int dims) {

		Label origTarget = new Label();
		Label errorTarget = new Label();

		// Multidimensional arrays can only have max 256 dimensions
		if (Properties.ARRAY_LIMIT < 256) {
			push(dims);
			visitFieldInsn(Opcodes.GETSTATIC, PackageInfo.getNameWithSlash(org.evosuite.Properties.class),
			               "ARRAY_LIMIT", "I");
			super.visitJumpInsn(Opcodes.IF_ICMPGE, errorTarget);
		}

		// Check each of the dimensions
		Map to = new HashMap();
		for (int i = dims - 1; i >= 0; i--) {
			int loc = newLocal(Type.INT_TYPE);
			storeLocal(loc);
			to.put(i, loc);
		}
		for (int i = 0; i < dims; i++) {
			loadLocal(to.get(i));
			visitFieldInsn(Opcodes.GETSTATIC, "org/evosuite/Properties",
			               "ARRAY_LIMIT", "I");
			super.visitJumpInsn(Opcodes.IF_ICMPGE, errorTarget);
		}
		goTo(origTarget);
		super.visitLabel(errorTarget);
		super.visitTypeInsn(Opcodes.NEW,
				PackageInfo.getNameWithSlash(TestCaseExecutor.TimeoutExceeded.class));
		super.visitInsn(Opcodes.DUP);
		super.visitMethodInsn(Opcodes.INVOKESPECIAL,
				PackageInfo.getNameWithSlash(TestCaseExecutor.TimeoutExceeded.class),
		                      "", "()V", false);
		super.visitInsn(Opcodes.ATHROW);
		super.visitLabel(origTarget);

		// Restore original dimensions
		for (int i = 0; i < dims; i++) {
			loadLocal(to.get(i));
		}

		super.visitMultiANewArrayInsn(desc, dims);
	}

}