JavaPatternMatching/src/de/dhbwstuttgart/syntaxtree/statement/IfStmt.java

// ino.module.IfStmt.8632.package 
package de.dhbwstuttgart.syntaxtree.statement;
// ino.end
// ino.module.IfStmt.8632.import 
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Vector;

import org.apache.log4j.Logger;

import de.dhbwstuttgart.bytecode.ClassFile;
import de.dhbwstuttgart.bytecode.CodeAttribute;
import de.dhbwstuttgart.bytecode.JVMCode;
import de.dhbwstuttgart.myexception.CTypeReconstructionException;
import de.dhbwstuttgart.myexception.JVMCodeException;
import de.dhbwstuttgart.myexception.SCExcept;
import de.dhbwstuttgart.myexception.SCStatementException;
import de.dhbwstuttgart.syntaxtree.Class;
import de.dhbwstuttgart.syntaxtree.SyntaxTreeNode;
import de.dhbwstuttgart.syntaxtree.operator.LogOp;
import de.dhbwstuttgart.syntaxtree.operator.Operator;
import de.dhbwstuttgart.syntaxtree.operator.RelOp;
import de.dhbwstuttgart.syntaxtree.type.BooleanType;
import de.dhbwstuttgart.syntaxtree.type.GenericTypeVar;
import de.dhbwstuttgart.syntaxtree.type.RefType;
import de.dhbwstuttgart.syntaxtree.type.Type;
import de.dhbwstuttgart.syntaxtree.type.TypePlaceholder;
import de.dhbwstuttgart.syntaxtree.type.Void;
import de.dhbwstuttgart.typeinference.ConstraintsSet;
import de.dhbwstuttgart.typeinference.FreshTypeVariable;
import de.dhbwstuttgart.typeinference.JavaCodeResult;
import de.dhbwstuttgart.typeinference.Pair;
import de.dhbwstuttgart.typeinference.ResultSet;
import de.dhbwstuttgart.typeinference.SingleConstraint;
import de.dhbwstuttgart.typeinference.assumptions.TypeAssumptions;
import de.dhbwstuttgart.typeinference.unify.MUB;
import de.dhbwstuttgart.typeinference.unify.Unify;
import sun.reflect.generics.reflectiveObjects.NotImplementedException;




// ino.class.IfStmt.25300.declaration 
public class IfStmt extends Statement
// ino.end
// ino.class.IfStmt.25300.body
{
    // ino.method.IfStmt.25304.definition 
    public IfStmt(int offset, int variableLength)
    // ino.end
    // ino.method.IfStmt.25304.body 
    {
        super(offset,variableLength);
    }
    // ino.end
    
    // ino.attribute.hamaDebug.25307.declaration 
    public boolean hamaDebug = true;    //hama: Debug Ausgaben von mir ein- bzw. ausschalten
    // ino.end
    // ino.attribute.expr.25310.declaration 
    public Expr expr;
    // ino.end
    // ino.attribute.then_block.25313.declaration 
    public Statement then_block;
    // ino.end
    // ino.attribute.else_block.25316.declaration 
    public Statement else_block;
    // ino.end
    // ino.attribute.parserlog.25319.declaration 
    protected static Logger parserlog = Logger.getLogger("parser");
    // ino.end
    
    
    
    // ino.method.set_Expr.25322.definition 
    public void set_Expr(Expr exp)
    // ino.end
    // ino.method.set_Expr.25322.body 
    {
        this.expr = exp;
    }
    // ino.end
    
    
    
    // ino.method.set_Then_block.25325.definition 
    public void set_Then_block(Statement blk)
    // ino.end
    // ino.method.set_Then_block.25325.body 
    {
        this.then_block = blk;
    }
    // ino.end
    
    
    
    // ino.method.set_Else_block.25328.definition 
    public void set_Else_block(Statement blk)
    // ino.end
    // ino.method.set_Else_block.25328.body 
    {
        this.else_block = blk;
    }
    // ino.end
    
    
    
    // ino.method.codegen.25334.definition 
    public void codegen(ClassFile classfile, CodeAttribute code, Vector paralist)
    throws JVMCodeException
    // ino.end
    // ino.method.codegen.25334.body 
    {
        if_codegen(classfile, code, false, paralist);
    }
    // ino.end
    
    
    
    // ino.method.if_codegen.25337.definition 
    public void if_codegen(ClassFile classfile, CodeAttribute code, boolean not, Vector paralist)
    throws JVMCodeException
    // ino.end
    // ino.method.if_codegen.25337.body 
    {
        if(expr instanceof NotExpr)
        {
            expr = ((NotExpr)expr).get_Expr();
            if_codegen(classfile, code, !not, paralist);
        }
        else
        {
            if(expr instanceof Binary)
            {
                Operator op = ((Binary)expr).get_Operator();
                if(op instanceof LogOp)
                {
                    ((LogOp)op).if_codegen(classfile, code, not, expr, then_block, else_block, paralist);
                }
                else
                {
                    if(op instanceof RelOp)
                    {
                        Expr expr1 = ((Binary)expr).get_Expr1();
                        Expr expr2 = ((Binary)expr).get_Expr2();
                        expr1.codegen(classfile, code, paralist);
                        expr2.codegen(classfile, code, paralist);
                        if(expr1 instanceof Null || expr2 instanceof Null)
                        {
                            ((RelOp)op).if_codegen(classfile, code, "null", not);
                        } 
                        else
                        {
                            ((RelOp)op).if_codegen(classfile, code, expr1.getTypeName(), not);
                        } 
                        int breakpoint1 = code.get_code_length();
                        code.add_code_short(0);
                        if(then_block!=null)
                        {
                            then_block.codegen(classfile, code, paralist);
                            code.set_code_short(code.get_code_length() + 1 - breakpoint1, breakpoint1);
                        }
                        int breakpoint2 = code.get_code_length();
                        if(else_block != null)
                        {
                            code.add_code(JVMCode.goto_);
                            code.add_code_short(0); // replaced later
                            else_block.codegen(classfile, code, paralist);
                            code.set_code_short(breakpoint2 + 4 - breakpoint1, breakpoint1);
                            code.set_code_short(code.get_code_length() - breakpoint2, breakpoint2 + 1);
                        }
                    }
                    else
                    {
                        throw new JVMCodeException("JVMCodeException: IfStmt: void if_codegen(ClassFile classfile, Code_attribute code, boolean not)");
                    }
                }
            }
            else
            {
                expr.codegen(classfile, code, paralist);
                if(!not)
                {
                    code.add_code(JVMCode.ifeq);
                } 
                else
                {
                    code.add_code(JVMCode.ifne);
                } 
                int breakpoint1 = code.get_code_length();
                code.add_code_short(0);
                if(then_block!=null)
                {
                    then_block.codegen(classfile, code, paralist);
                    code.set_code_short(code.get_code_length() + 1 - breakpoint1, breakpoint1);
                }
                int breakpoint2 = code.get_code_length();
                if(!(else_block==null || else_block instanceof EmptyStmt))
                {
                    //hama: Die zwei folgenen if-Abfragen wurden eingef<65>gt und beheben den Bug,
                    //der zuerst im Use Case Toggle1 bemerkt wurde. Hier wird nun gepr<70>ft ob der
                    //letzte Befehl in einem if-Block ein return war. Trifft dieser Fall zu,
                    //so wird kein goto Befehl (f<>r das <20>berspringen des else-Blocks eingef<65>gt)
                    //-> das verlangt die vm ->der code w<>re nicht erreichbar.
                    //Allerdings k<>nnte das return-Statement nat<61>rlich auch an einer anderen
                    //Stelle (nicht als letzter Befehl) stehen, f<>r diesen Fall d<>rfte die
                    //Codegenerierung noch nicht funktionieren. Hab versucht diesen Fall mit
                    //Toggle3 zu erzeugen - wird aber richtig generiert.
                    //letztes Statement im Vector in s schreiben
                    //Statement s = (Statement)(((Block)this.then_block).statements.lastElement());
                    //Instanz von Return zum pr<70>fen anlegen
                    Return r = new Return(getOffset(),getVariableLength());
                    
                    if( !(((Block)this.then_block).statements.lastElement()).getClass().equals(r.getClass()) )
                    {
                        code.add_code(JVMCode.goto_);
                        code.add_code_short(0);
                    }
                    else_block.codegen(classfile, code, paralist);
                    if( !(((Block)this.then_block).statements.lastElement()).getClass().equals(r.getClass()) )
                    {
                        code.set_code_short(breakpoint2 + 4 - breakpoint1, breakpoint1);
                        code.set_code_short(code.get_code_length()-breakpoint2, breakpoint2 + 1);
                    }
                }
            }
        }
    }
    // ino.end


    

    // ino.method.wandleRefTypeAttributes2GenericAttributes.25349.definition 
    public void wandleRefTypeAttributes2GenericAttributes(Vector<Type> paralist, Vector<GenericTypeVar> genericMethodParameters)
    // ino.end
    // ino.method.wandleRefTypeAttributes2GenericAttributes.25349.body 
    {
        if(then_block!=null){
            then_block.wandleRefTypeAttributes2GenericAttributes(paralist,genericMethodParameters);
        }
        if(else_block!=null){
            else_block.wandleRefTypeAttributes2GenericAttributes(paralist,genericMethodParameters);
        }
        
    }
    // ino.end


	@Override
	public ConstraintsSet TYPEStmt(TypeAssumptions assumptions) {
		ConstraintsSet ret = new ConstraintsSet();
		this.setType(TypePlaceholder.fresh(this));
		
		ret.add(expr.TYPEExpr(assumptions)); // die Constraints f<>r (expressionDesIfStmt)
		ret.add(this.then_block.TYPEStmt(assumptions));
		if(else_block!=null){
			ret.add(this.else_block.TYPEStmt(assumptions));
			if(!(else_block.getType() instanceof Void))ret.add(new SingleConstraint(else_block.getType().TYPE(assumptions, this),this.getType().TYPE(assumptions, this)));
		}
		ret.add(new SingleConstraint(expr.getType().TYPE(assumptions, this),assumptions.getTypeFor(new RefType("Boolean",0), this))); //(expressionDesIfStmt)<.boolean
		if(!(then_block.getType() instanceof Void))ret.add(new SingleConstraint(then_block.getType().TYPE(assumptions, this),this.getType().TYPE(assumptions, this)));
		if(then_block.getType() instanceof Void && 
				(else_block == null || else_block.getType() instanceof Void))this.setType(new Void(this.getOffset()));
		return ret;
	}
	
	public int getTypeLineNumber() {
		throw new NotImplementedException();
	}



	@Override
	public JavaCodeResult printJavaCode(ResultSet resultSet) {
		JavaCodeResult ret = new JavaCodeResult("If(").attach(this.expr.printJavaCode(resultSet)).attach("){\n");
		if(this.then_block!=null)ret.attach(this.then_block.printJavaCode(resultSet));
		ret.attach("\n}else{\n");
		if(this.else_block!=null)ret.attach(this.else_block.printJavaCode(resultSet));
		ret.attach("\n}");
		return ret;
	}



	@Override
	public Vector<SyntaxTreeNode> getChildren() {
		Vector<SyntaxTreeNode> ret = new Vector<SyntaxTreeNode>();
		if(this.expr!=null)ret.add(this.expr);
		if(this.else_block!=null)ret.add(this.else_block);
		if(this.then_block!=null)ret.add(this.then_block);
		return ret;
	}
}
// ino.end