Implemented NewStatementExpression and finished the return of objects (classes, methods) with fully qualified name

src/main/java/abstractSyntaxTree/Class/MethodDecl.java

@@ -22,7 +22,6 @@ public class MethodDecl implements Node {
     public String returnType;
     public BlockStatement codeBlock;
 
-    //TODO: Can this be a linked hash map? --> need it to be to get the index of local variables
     public LinkedHashMap<String, String> localVars;
 
     public MethodDecl(String classThatContainsMethod, String returnType, String name, ParameterList parameters, BlockStatement codeBlock){
@@ -43,7 +42,6 @@ public class MethodDecl implements Node {
         return result;
     }
 
-
     //Need to get the returnType of the method if it is an object
     // methodContext (class, (returnType, (identifier, parameter)))
     public void codeGen(ClassWriter cw, HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext) throws Exception {
@@ -129,7 +127,6 @@ public class MethodDecl implements Node {
         }
         descriptor.append(")");
 
-
         // Get the return type
         // If the return type is null, it is a constructor, and we need to append V
         if (returnType == null) {

src/main/java/abstractSyntaxTree/Expression/InstVarExpression.java

@@ -3,17 +3,17 @@ package abstractSyntaxTree.Expression;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Class.RefType;
 import abstractSyntaxTree.Parameter.ParameterList;
+import gen.DecafParser;
 import jdk.jshell.spi.ExecutionControl;
 import org.objectweb.asm.MethodVisitor;
 import org.objectweb.asm.Opcodes;
 
 import java.util.HashMap;
 import java.util.LinkedHashMap;
+import java.util.Objects;
 
 public class InstVarExpression implements IExpression{
 
-    //TODO: We have to decide upon more parameters and where they come from, for
-    // example here we need the index of the field, the class reference and the field name
     public RefType classRef;
     public String fieldName;
 
@@ -22,7 +22,6 @@ public class InstVarExpression implements IExpression{
         this.fieldName = fieldName;
     }
 
-
     @Override
     public TypeCheckResult typeCheck(HashMap<String, HashMap<String, HashMap<String, ParameterList>>> methodContext, HashMap<String, HashMap<String, String>> typeContext, HashMap<String, String> localVars) throws Exception {
 
@@ -42,26 +41,30 @@ public class InstVarExpression implements IExpression{
         //Get the field information
         String fieldType = typeContext.get(classRef.name).get(fieldName);
 
-        String fieldDescriptor;
+        StringBuilder descriptor = new StringBuilder();
+
 
         switch (fieldType) {
             case "int":
-                fieldDescriptor = "I";
+                descriptor.append("I");
                 break;
             case "boolean":
-                fieldDescriptor = "Z";
+                descriptor.append("Z");
                 break;
             case "char":
-                fieldDescriptor = "C";
+                descriptor.append("C");
                 break;
             default:
-                //TODO: We need the fully qualified name of the class here in field type
+                String fullReturnType = typeContext.get(classRef.name).get(fieldName);
-                fieldDescriptor = "L" + fieldType + ";";
+
+                // If it is a class reference replace the "." with "/" and return it
+                if (fieldType.contains(".")) fullReturnType = fullReturnType.replaceAll("\\.", "/");
+                if (fullReturnType != null) descriptor.append("L").append(fullReturnType).append(";");
                 break;
         }
 
         // Load the variable onto the stack
-        mv.visitFieldInsn(Opcodes.GETFIELD, classRef.name, fieldName, fieldDescriptor);
+        mv.visitFieldInsn(Opcodes.GETFIELD, classRef.name, fieldName, descriptor.toString());
     }
 
     @Override

src/main/java/abstractSyntaxTree/StatementExpression/AssignStatementExpression.java

@@ -99,19 +99,34 @@ public class AssignStatementExpression extends AbstractType implements IExpressi
 
             // Load "this" onto the stack
             mv.visitVarInsn(Opcodes.ALOAD, 0);
-        }
+
-        /*
+            // Duplicate the top of the stack as we'll need it for both the PUTFIELD and subsequent expressions
-        if (left instanceof VarRefExpression varRef) {
-            //TODO: Implement the handling of a variable reference --> I need a list of local variables
-            //      for that to determine if the variable is a local or field variable
-        } else if (left instanceof InstVarExpression instVar) {
             mv.visitInsn(Opcodes.DUP_X1);
 
-            // We now again need the owner (class reference), name (of the Field in the owner) and type of the field
+            // Get the field information
-            //mv.visitFieldInsn(Opcodes.PUTFIELD, instVar.className, instVar.varName, instVar.type);
+            String fieldType = typeContext.get(instVar.classRef.name).get(instVar.fieldName);
+
+            StringBuilder descriptor = new StringBuilder();
+
+            switch (fieldType) {
+                case "int":
+                    descriptor.append("I");
+                    break;
+                case "bool":
+                    descriptor.append("Z");
+                    break;
+                default:
+                    String fullReturnType = typeContext.get(instVar.classRef.name).get(instVar.fieldName);
+
+                    // If it is a class reference replace the "." with "/" and return it
+                    if (fieldType.contains(".")) fullReturnType = fullReturnType.replaceAll("\\.", "/");
+                    if (fullReturnType != null) descriptor.append("L").append(fullReturnType).append(";");
+                    break;
             }
+
+            // Store the value in the field
+            mv.visitFieldInsn(Opcodes.PUTFIELD, instVar.classRef.name, instVar.fieldName, descriptor.toString());
         }
-         */
     }
 
     @Override

src/main/java/abstractSyntaxTree/StatementExpression/NewStatementExpression.java

@@ -4,6 +4,7 @@ import TypeCheck.AbstractType;
 import TypeCheck.TypeCheckHelper;
 import TypeCheck.TypeCheckResult;
 import abstractSyntaxTree.Expression.IExpression;
+import abstractSyntaxTree.Parameter.Parameter;
 import abstractSyntaxTree.Parameter.ParameterList;
 import abstractSyntaxTree.Statement.IStatement;
 import org.objectweb.asm.MethodVisitor;
@@ -17,9 +18,11 @@ import java.util.List;
 public class NewStatementExpression extends AbstractType implements IExpression, IStatement {
 
     private String className;
+    private List<IExpression> arguments;
 
-    public NewStatementExpression(String className) {
+    public NewStatementExpression(String className, List<IExpression> arguments) {
         this.className = className;
+        this.arguments = arguments;
     }
 
     @Override
@@ -40,7 +43,45 @@ public class NewStatementExpression extends AbstractType implements IExpression,
 
         //Duplicate the reference, so I can use it after the INVOKE consumes one
         mv.visitInsn(Opcodes.DUP);
+
+        for (IExpression argument : arguments) {
+            argument.codeGen(mv, localVars, typeContext);
+        }
+        String descriptor = getConstructorDescriptor();
+
         //Call the constructor
-        mv.visitMethodInsn(Opcodes.INVOKESPECIAL, className, "<init>", "()V", false);
+        mv.visitMethodInsn(Opcodes.INVOKESPECIAL, className, "<init>", descriptor, false);
+    }
+
+    private String getConstructorDescriptor() {
+        StringBuilder descriptor = new StringBuilder();
+
+        for (IExpression parameter : arguments) {
+            TypeCheckResult result = parameter.getTypeCheckResult();
+            String type = result.type;
+
+            switch (type) {
+                case "int":
+                    descriptor.append("I");
+                    break;
+                case "bool":
+                    descriptor.append("Z");
+                    break;
+                case "char":
+                    descriptor.append("C");
+                    break;
+                case "void":
+                    descriptor.append("V");
+                    break;
+                default:
+                    // If it is a class reference replace the "." with "/" and return it
+                    if (type.contains(".")) type = type.replaceAll("\\.", "/");
+                    descriptor.append("L").append(type).append(";");
+                    break;
+            }
+        }
+
+        descriptor.append(")V");  // Constructors always return void
+        return descriptor.toString();
     }
 }