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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.symbolic.vm;

import org.evosuite.symbolic.expr.bv.IntegerConstant;
import org.evosuite.symbolic.expr.bv.IntegerValue;
import org.evosuite.symbolic.expr.fp.RealConstant;
import org.evosuite.symbolic.expr.fp.RealValue;
import org.evosuite.symbolic.expr.ref.ReferenceConstant;
import org.evosuite.symbolic.expr.ref.ReferenceExpression;
import org.evosuite.dse.AbstractVM;

/**
 * 
 * @author galeotti
 * 
 */
public final class LocalsVM extends AbstractVM {

	private final SymbolicEnvironment env;

	public LocalsVM(SymbolicEnvironment env) {
		this.env = env;
	}

	@Override
	public void NOP() { /**/
	}

	/**
	 * http://java.sun.com/docs/books/jvms/second_edition/html/Instructions2.doc
	 * .html#aconst_null
	 */
	@Override
	public void ACONST_NULL() {
		env.topFrame().operandStack.pushNullRef();
	}

	/**
	 * http://java.sun.com/docs/books/jvms/second_edition/html/Instructions2.
	 * doc6.html#iconst_i
	 */
	@Override
	public void ICONST_M1() {
		env.topFrame().operandStack.pushBv32(ExpressionFactory.ICONST_M1);
	}

	@Override
	public void ICONST_0() {
		env.topFrame().operandStack.pushBv32(ExpressionFactory.ICONST_0);
	}

	@Override
	public void ICONST_1() {
		env.topFrame().operandStack.pushBv32(ExpressionFactory.ICONST_1);
	}

	@Override
	public void ICONST_2() {
		env.topFrame().operandStack.pushBv32(ExpressionFactory.ICONST_2);
	}

	@Override
	public void ICONST_3() {
		env.topFrame().operandStack.pushBv32(ExpressionFactory.ICONST_3);
	}

	@Override
	public void ICONST_4() {
		env.topFrame().operandStack.pushBv32(ExpressionFactory.ICONST_4);
	}

	@Override
	public void ICONST_5() {
		env.topFrame().operandStack.pushBv32(ExpressionFactory.ICONST_5);
	}

	@Override
	public void LCONST_0() {
		env.topFrame().operandStack.pushBv64(ExpressionFactory.ICONST_0);
	}

	@Override
	public void LCONST_1() {
		env.topFrame().operandStack.pushBv64(ExpressionFactory.ICONST_1);
	}

	@Override
	public void FCONST_0() {
		env.topFrame().operandStack.pushFp32(ExpressionFactory.RCONST_0);
	}

	@Override
	public void FCONST_1() {
		env.topFrame().operandStack.pushFp32(ExpressionFactory.RCONST_1);
	}

	@Override
	public void FCONST_2() {
		env.topFrame().operandStack.pushFp32(ExpressionFactory.RCONST_2);
	}

	@Override
	public void DCONST_0() {
		env.topFrame().operandStack.pushFp64(ExpressionFactory.RCONST_0);
	}

	@Override
	public void DCONST_1() {
		env.topFrame().operandStack.pushFp64(ExpressionFactory.RCONST_1);
	}

	/**
	 * Bytecode instruction stream: ... ,0x10, byte, ...
	 * 
	 * 
	 * Push the byte value that immediately follows this bytecode instruction
	 * (0x10) in the bytecode stream. The byte value is sign-extended to an int.
	 * 
	 * http://java.sun.com/docs/books/jvms/second_edition/html/Instructions2.
	 * doc1.html#bipush
	 */
	@Override
	public void BIPUSH(int value) {
		IntegerConstant intConstant = ExpressionFactory
				.buildNewIntegerConstant(value);
		env.topFrame().operandStack.pushBv32(intConstant);
	}

	/**
	 * Bytecode instruction stream: ... ,0x11, byte1, byte2, ...
	 * 
	 * 

	 * Push the short value that immediately follows this bytecode instruction
	 * (0x11) in the bytecode stream. The short value is sign-extended to an
	 * int.
	 * 
	 * http://java.sun.com/docs/books/jvms/second_edition/html/Instructions2.
	 * doc13.html#sipush
	 */
	@Override
	public void SIPUSH(int value) {
		env.topFrame().operandStack.pushBv32(ExpressionFactory
				.buildNewIntegerConstant(value));
	}

	/**
	 * Bytecode instruction stream: ... ,0x12, index, ...
	 * 
	 * 

	 * Push corresponding symbolic constant from constant pool (at index) onto
	 * the operand stack.
	 * 
	 * http://java.sun.com/docs/books/jvms/second_edition/html/Instructions2.
	 * doc8.html#ldc
	 */
	@Override
	public void LDC(int x) {
		env.topFrame().operandStack.pushBv32(ExpressionFactory
				.buildNewIntegerConstant(x));

	}

	@Override
	public void LDC(String x) {
		if (x == null) {
			env.topFrame().operandStack.pushNullRef();
		} else {
			ReferenceConstant stringRef = (ReferenceConstant) env.heap
					.getReference(x);
			env.topFrame().operandStack.pushRef(stringRef);
		}
	}

	/**
	 * Class literal described in Java Spec 3rd ed, Section 15.8.2
	 * 
	 * ".class" Java expression, such as for example in:
	 * I.class.isAssignableFrom(..)
	 * 
	 * 
	 * Represent reference to Class object with symbolic function application:
	 * ClassRef(Type)
	 * 
	 * @see http 
	 *      ://java.sun.com/docs/books/jls/third_edition/html/expressions.html
	 *      #15.8.2
	 */
	@Override
	public void LDC(Class x) {
		ReferenceExpression ref = env.heap.getReference(x);
		env.topFrame().operandStack.pushRef(ref);
	}

	@Override
	public void LDC2_W(long x) {
		env.topFrame().operandStack.pushBv64(ExpressionFactory
				.buildNewIntegerConstant(x));
	}

	@Override
	public void LDC(float x) {
		RealConstant realConstant = ExpressionFactory.buildNewRealConstant(x);
		env.topFrame().operandStack.pushFp32(realConstant);
	}

	@Override
	public void LDC2_W(double x) {
		env.topFrame().operandStack.pushFp64(new RealConstant(x));
	}

	/**
	 * ... ==> ..., value
	 * 
	 * http://java.sun.com/docs/books/jvms/second_edition/html/Instructions2.
	 * doc6.html#iload
	 */
	@Override
	public void ILOAD(int i) {
		IntegerValue integerExpression = env.topFrame().localsTable
				.getBv32Local(i);
		env.topFrame().operandStack.pushBv32(integerExpression);
	}

	@Override
	public void LLOAD(int i) {
		IntegerValue integerExpression = env.topFrame().localsTable
				.getBv64Local(i);
		env.topFrame().operandStack.pushBv64(integerExpression);
	}

	@Override
	public void FLOAD(int i) {
		RealValue realExpr = (RealValue) env.topFrame().localsTable
				.getFp32Local(i);
		env.topFrame().operandStack.pushFp32(realExpr);
	}

	@Override
	public void DLOAD(int i) {
		RealValue realExpr = (RealValue) env.topFrame().localsTable
				.getFp64Local(i);
		env.topFrame().operandStack.pushFp64(realExpr);
	}

	@Override
	public void ALOAD(int i) {
		Operand local = env.topFrame().localsTable.getOperand(i);
		env.topFrame().operandStack.pushOperand(local);
	}

	/**
	 * ..., value ==> ...
	 * 
	 * http://java.sun.com/docs/books/jvms/second_edition/html/Instructions2.
	 * doc6.html#istore
	 */
	@Override
	public void ISTORE(int i) {
		IntegerValue integerExpr = env.topFrame().operandStack.popBv32();
		env.topFrame().localsTable.setBv32Local(i, integerExpr);
	}

	@Override
	public void LSTORE(int i) {
		IntegerValue integerExpr = env.topFrame().operandStack.popBv64();
		env.topFrame().localsTable.setBv64Local(i, integerExpr);
	}

	@Override
	public void FSTORE(int i) {
		RealValue realExpr = env.topFrame().operandStack.popFp32();
		env.topFrame().localsTable.setFp32Local(i, realExpr);
	}

	@Override
	public void DSTORE(int i) {
		RealValue realExpr = env.topFrame().operandStack.popFp64();
		env.topFrame().localsTable.setFp64Local(i, realExpr);
	}

	@Override
	public void ASTORE(int i) {
		Operand operand = env.topFrame().operandStack.popOperand();
		env.topFrame().localsTable.setOperand(i, operand);
	}
}