Implement ThisCall (fix #295)

resources/bytecode/javFiles/Bug295.jav

@@ -0,0 +1,18 @@
+import java.lang.Integer;
+
+public class Bug295 {
+    public Integer a;
+    public Integer b;
+    public Integer c;
+
+    public Bug295(a, b, c) {
+        this(a);
+        this.b = b;
+        this.c = c;
+    }
+
+    public Bug295(a) {
+        this.a = a;
+    }
+}
+

src/main/java/de/dhbwstuttgart/parser/SyntaxTreeGenerator/StatementGenerator.java

@@ -717,6 +717,8 @@ public class StatementGenerator {
         MethodCall ret;
         if (expr.SUPER() != null) {
             ret = new SuperCall(argumentList, TypePlaceholder.fresh(offset), signature, offset);
+        } else if(expr.THIS() != null) {
+            ret = new ThisCall(argumentList, TypePlaceholder.fresh(offset), signature, offset);
         } else {
             ret = new MethodCall(TypePlaceholder.fresh(offset), getReceiver(receiver), name, argumentList, TypePlaceholder.fresh(offset), signature, offset);
         }

src/main/java/de/dhbwstuttgart/parser/SyntaxTreeGenerator/SyntaxTreeGenerator.java

@@ -451,7 +451,7 @@ public class SyntaxTreeGenerator {
 
   protected static Block prepareBlock(Block constructorBlock, RefType superClass) {
     List<Statement> statements = constructorBlock.getStatements();
-    if (statements.isEmpty() || !(statements.get(0) instanceof SuperCall))  {
+    if (statements.isEmpty() || !(statements.get(0) instanceof SuperCall || statements.get(0) instanceof ThisCall))  {
       var signature = new ArrayList<RefTypeOrTPHOrWildcardOrGeneric>();
       signature.add(new Void(new NullToken()));
       statements.add(0, new SuperCall(superClass, signature, constructorBlock.getOffset()));

src/main/java/de/dhbwstuttgart/syntaxtree/AbstractASTWalker.java

@@ -286,6 +286,11 @@ public abstract class AbstractASTWalker implements ASTVisitor {
         this.visit((MethodCall) superCall);
     }
 
+    @Override
+    public void visit(ThisCall thisCall) {
+
+    }
+
     @Override
     public void visit(Switch switchStmt) {
         switchStmt.getSwitch().accept(this);

src/main/java/de/dhbwstuttgart/syntaxtree/StatementVisitor.java

@@ -71,6 +71,8 @@ public interface StatementVisitor {
 
     void visit(SuperCall superCall);
 
+    void visit(ThisCall thisCall);
+
     void visit(ExpressionReceiver expressionReceiver);
 
     void visit(UnaryExpr unaryExpr);

src/main/java/de/dhbwstuttgart/syntaxtree/statement/ThisCall.java

@@ -1,20 +1,24 @@
 package de.dhbwstuttgart.syntaxtree.statement;
 
 import de.dhbwstuttgart.syntaxtree.Constructor;
+import de.dhbwstuttgart.syntaxtree.StatementVisitor;
+import de.dhbwstuttgart.syntaxtree.type.RefTypeOrTPHOrWildcardOrGeneric;
+import de.dhbwstuttgart.syntaxtree.type.Void;
+import org.antlr.v4.runtime.Token;
 
+import java.util.ArrayList;
 
 
 public class ThisCall extends MethodCall
 {
-    public ThisCall(Receiver receiver, ArgumentList arglist, int offset)
-    {
-        // TODO What is this?
-		super(null, null, null, null, null, null, null);
-
+    public ThisCall(ArgumentList argumentList, RefTypeOrTPHOrWildcardOrGeneric receiverType, ArrayList<RefTypeOrTPHOrWildcardOrGeneric> argTypes, Token offset) {
+        super(new Void(offset), new ExpressionReceiver(new This(offset)), "<init>", argumentList, receiverType, argTypes, offset);
     }
 
-    public ArgumentList arglist;
-
+    @Override
+    public void accept(StatementVisitor visitor) {
+        visitor.visit(this);
+    }
 }
 
 

src/main/java/de/dhbwstuttgart/syntaxtree/visual/OutputGenerator.java

@@ -382,6 +382,13 @@ public class OutputGenerator implements ASTVisitor {
         out.append(")");
     }
 
+    @Override
+    public void visit(ThisCall thisCall) {
+        out.append("this(");
+        thisCall.arglist.accept(this);
+        out.append(")");
+    }
+
     @Override
     public void visit(ExpressionReceiver receiver) {
         receiver.expr.accept(this);

src/main/java/de/dhbwstuttgart/target/generate/StatementToTargetExpression.java

@@ -1,6 +1,7 @@
 package de.dhbwstuttgart.target.generate;
 
 import de.dhbwstuttgart.exceptions.NotImplementedException;
+import de.dhbwstuttgart.parser.NullToken;
 import de.dhbwstuttgart.parser.SyntaxTreeGenerator.AssignToLocal;
 import de.dhbwstuttgart.parser.scope.JavaClassName;
 import de.dhbwstuttgart.syntaxtree.*;
@@ -290,6 +291,15 @@ public class StatementToTargetExpression implements ASTVisitor {
         result = new TargetMethodCall(type, type, parameters, new TargetSuper(aSuper), superCall.getArgumentList().getArguments().stream().map(converter::convert).toList(), aSuper, superCall.name, false, false);
     }
 
+    @Override
+    public void visit(ThisCall thisCall) {
+        var aThis = converter.convert(new RefType(converter.currentClass.getClassName(), new NullToken()));
+        var type = converter.convert(thisCall.getType());
+        var parameters = thisCall.arglist.getArguments().stream().map(par -> converter.convert(par.getType())).toList();
+
+        result = new TargetMethodCall(type, type, parameters, new TargetThis(aThis), thisCall.getArgumentList().getArguments().stream().map(converter::convert).toList(), aThis, thisCall.name, false, false);
+    }
+
     @Override
     public void visit(ExpressionReceiver expressionReceiver) {
         result = converter.convert(expressionReceiver.expr);

src/main/java/de/dhbwstuttgart/target/generate/TracingStatementVisitor.java

@@ -1,12 +1,18 @@
 package de.dhbwstuttgart.target.generate;
 
 import de.dhbwstuttgart.parser.SyntaxTreeGenerator.AssignToLocal;
+import de.dhbwstuttgart.syntaxtree.Method;
 import de.dhbwstuttgart.syntaxtree.StatementVisitor;
 import de.dhbwstuttgart.syntaxtree.statement.*;
 
 // This visitor walks the entire tree, individual methods may be overridden
 public abstract class TracingStatementVisitor implements StatementVisitor {
 
+    @Override
+    public void visit(ThisCall thisCall) {
+        visit((MethodCall) thisCall);
+    }
+
     @Override
     public void visit(MethodCall methodCall) {
         methodCall.receiver.accept(this);
@@ -155,7 +161,7 @@ public abstract class TracingStatementVisitor implements StatementVisitor {
 
     @Override
     public void visit(SuperCall superCall) {
-
+        visit((MethodCall) superCall);
     }
 
     @Override

src/main/java/de/dhbwstuttgart/typeinference/typeAlgo/TYPEStmt.java

@@ -564,7 +564,7 @@ public class TYPEStmt implements StatementVisitor {
                 for (var ctor : clazz.getConstructors()) {
                     var params = convertParams(ctor.getParameterList(), info);
                     if (params.size() != superCall.arglist.getArguments().size()) continue;
-                    var assumption = new MethodAssumption(null, new Void(new NullToken()), params, createTypeScope(clazz, ctor), ctor.isInherited);
+                    var assumption = new MethodAssumption(clazz, new Void(new NullToken()), params, createTypeScope(clazz, ctor), ctor.isInherited);
 
                     GenericsResolver resolver = getResolverInstance();
                     Set<Constraint<Pair>> oneMethodConstraints = generateConstraint(superCall, assumption, info, resolver);
@@ -576,6 +576,21 @@ public class TYPEStmt implements StatementVisitor {
         constraintsSet.addOderConstraint(methodConstraints);
     }
 
+    @Override
+    public void visit(ThisCall thisCall) {
+        Set<Constraint<Pair>> methodConstraints = new HashSet<>();
+        for (var ctor : info.getCurrentClass().getConstructors()) {
+            var params = convertParams(ctor.getParameterList(), info);
+            if (params.size() != thisCall.arglist.getArguments().size()) continue;
+            var assumption = new MethodAssumption(info.getCurrentClass(), new Void(new NullToken()), params, createTypeScope(info.getCurrentClass(), ctor), ctor.isInherited);
+
+            GenericsResolver resolver = getResolverInstance();
+            Set<Constraint<Pair>> oneMethodConstraints = generateConstraint(thisCall, assumption, info, resolver);
+            methodConstraints.addAll(oneMethodConstraints);
+        }
+        constraintsSet.addOderConstraint(methodConstraints);
+    }
+
     /*
      * METHOD CALL Section:
      */

src/test/java/TestComplete.java

@@ -941,6 +941,16 @@ public class TestComplete {
         var instance = clazz.getDeclaredConstructor().newInstance();
     }
 
+    @Test
+    public void testBug295() throws Exception {
+        var classFiles = generateClassFiles(new ByteArrayClassLoader(), "Bug295.jav");
+        var clazz = classFiles.get("Bug295");
+        var instance = clazz.getDeclaredConstructor(Integer.class, Integer.class, Integer.class).newInstance(1, 2, 3);
+        assertEquals(clazz.getDeclaredField("a").get(instance), 1);
+        assertEquals(clazz.getDeclaredField("b").get(instance), 2);
+        assertEquals(clazz.getDeclaredField("c").get(instance), 3);
+    }
+
     @Test
     public void testBug296() throws Exception {
         var classFiles = generateClassFiles(new ByteArrayClassLoader(), "Bug296.jav");