Flatten generic function types

resources/bytecode/javFiles/Faculty.jav

@@ -17,7 +17,7 @@ public class Faculty {
     
     
     
-    public getFact(x) {
+    public getFact(java.lang.Integer x) {
         return fact.apply(x);
     }
 }

resources/bytecode/javFiles/Tph2.jav

@@ -1,8 +1,8 @@
 public class Tph2 {
-	id = x->x;
+    id = x->x;
-	id3 (x) {
+    id3 (x) {
-    	   	return id.apply(x);
+        return id.apply(x);
-    	}
+    }
 
 /*
 	m(a,b){

src/main/java/de/dhbwstuttgart/bytecode/FunNGenerator.java

@@ -1,16 +1,15 @@
 package de.dhbwstuttgart.bytecode;
 
 import de.dhbwstuttgart.target.tree.TargetGeneric;
-import de.dhbwstuttgart.target.tree.type.TargetGenericType;
+import de.dhbwstuttgart.target.tree.type.*;
-import de.dhbwstuttgart.target.tree.type.TargetRefType;
-import de.dhbwstuttgart.target.tree.type.TargetSpecializedType;
-import de.dhbwstuttgart.target.tree.type.TargetType;
 import org.objectweb.asm.ClassWriter;
 import org.objectweb.asm.MethodVisitor;
 import org.objectweb.asm.Type;
 
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Map;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -32,7 +31,24 @@ public class FunNGenerator {
     private static final String objectSuperType = Type.getInternalName(Object.class).replace('.','/');
     private static final String objectSignature = applySignature(TargetType.Object);
 
-    private static String applyDescriptor(TargetType a) { return a.toDescriptor(); }
+
+    private static String applyDescriptor(TargetType type, int[] start) {
+        var res = "L" + type.getInternalName() + "<";
+        if (type instanceof TargetSpecializedType a)
+            for (var param : a.params()) {
+                if (param instanceof TargetGenericType gp) {
+                    res += "TT" + start[0] + ";";
+                    start[0] += 1;
+                } else {
+                    res += applyDescriptor(param, start);
+                }
+            }
+        else return type.toDescriptor();
+        res += ">;";
+
+        return res;
+    }
+
     private static String applySignature(TargetType a) { return a.toSignature(); }
     private static String applyNameDescriptor(TargetType a){ return a instanceof TargetGenericType ? "LTPH;" : String.format("%s;", applySignature(a)); }
 
@@ -68,22 +84,20 @@ public class FunNGenerator {
     public static byte[] generateSpecializedBytecode(List<TargetType> argumentTypes, TargetType returnType) {
         List<TargetType> parameters = Stream
                 .concat(argumentTypes.stream(), Stream.of(returnType))
-                .collect(Collectors.toList());
+                .toList();
-        StringBuilder funNClassSignature = new StringBuilder(objectSignature + applyDescriptor(new TargetRefType(getSuperClassName(argumentTypes.size()), parameters)));
+
+        var start = new int[]{0};
+        StringBuilder funNClassSignature = new StringBuilder(objectSignature + applyDescriptor(new TargetRefType(getSuperClassName(argumentTypes.size()), parameters), start));
         boolean containsGeneric = false;
 
         String genericSignature = "<";
-        var generics = new HashSet<TargetGenericType>();
+        for (var i = 0; i < start[0]; i++)
-        for (TargetType typeArgument : parameters) {
+            genericSignature += String.format("T%d:%s", i, objectSignature);
-            collectGenericTypeArguments(generics, typeArgument);
+        containsGeneric = true;
-        }
-        for (var generic : generics) {
-            genericSignature += String.format("%s:%s", generic.name(), objectSignature);
-            containsGeneric = true;
-        }
 
         genericSignature += ">";
         if (containsGeneric) funNClassSignature.insert(0, genericSignature);
+        System.out.println(funNClassSignature.toString());
 
         ClassWriter classWriter = new ClassWriter(0);
         classWriter.visit(bytecodeVersion, ACC_PUBLIC | ACC_ABSTRACT | ACC_INTERFACE, getSpecializedClassName(argumentTypes, returnType), funNClassSignature.toString(), objectSuperType, new String[]{getSuperClassName(argumentTypes.size())});
@@ -91,12 +105,14 @@ public class FunNGenerator {
         return classWriter.toByteArray();
     }
 
-    private static void collectGenericTypeArguments(HashSet<TargetGenericType> generics, TargetType typeArgument) {
+    private static void collectGenericTypeArguments(Map<TargetGenericType, Integer> generics, TargetType typeArgument) {
         if (typeArgument instanceof TargetSpecializedType specializedType) {
             for (var arg : specializedType.params())
                 collectGenericTypeArguments(generics, arg);
         } else if (typeArgument instanceof TargetGenericType genericType) {
-            generics.add(genericType);
+            if (generics.containsKey(genericType))
+                generics.put(genericType, generics.get(genericType) + 1);
+            else generics.put(genericType, 0);
         }
     }
 
@@ -112,14 +128,6 @@ public class FunNGenerator {
                 .replace(";", "$_$");
     }
 
-    public static String getSpecializedDescriptor(List<TargetType> argumentTypes, TargetType returnType) {
-        return applyDescriptor(new TargetRefType(getSpecializedClassName(argumentTypes, returnType)));
-    }
-
-    public static String getSpecializedSignature(List<TargetType> argumentTypes, TargetType returnType) {
-        return applySignature(new TargetRefType(getSpecializedClassName(argumentTypes, returnType)));
-    }
-
     public static List<TargetType> getArguments(List<TargetType> list) {
         return list
                 .stream()

src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java

@@ -898,7 +898,7 @@ public class JavaTXCompiler {
 		return generatedClasses;
 	}
 
-	private void writeClassFile(Map<JavaClassName, byte[]> classFiles, File path) throws IOException {
+	public void writeClassFile(Map<JavaClassName, byte[]> classFiles, File path) throws IOException {
 		FileOutputStream output;
 		for (JavaClassName name : classFiles.keySet()) {
 			byte[] bytecode = classFiles.get(name);

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

@@ -15,6 +15,7 @@ import de.dhbwstuttgart.target.tree.expression.TargetExpression;
 import de.dhbwstuttgart.target.tree.type.*;
 import de.dhbwstuttgart.typeinference.result.*;
 
+import java.lang.annotation.Target;
 import java.util.*;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
@@ -52,8 +53,7 @@ public class ASTToTargetAST {
         }
 
         @Override
-        void generics(ClassOrInterface classOrInterface, Set<ResultPair<?, ?>> result) {
+        void generics(ClassOrInterface classOrInterface, Set<ResultPair<?, ?>> result, Set<TypePlaceholder> referenced) {
-            var referenced = new HashSet<TypePlaceholder>();
             eliminateInfima(result, referenced);
             eliminateInnerTypeVariablesOfClass(classOrInterface, result, referenced);
         }
@@ -72,8 +72,7 @@ public class ASTToTargetAST {
         }
 
         @Override
-        void generics(ClassOrInterface classOrInterface, Set<ResultPair<?, ?>> result) {
+        void generics(ClassOrInterface classOrInterface, Set<ResultPair<?, ?>> result, Set<TypePlaceholder> referenced) {
-            var referenced = new HashSet<TypePlaceholder>();
             eliminateCycles(result, referenced);
             eliminateInfima(result, referenced);
             eliminateInnerTypeVariablesOfClass(classOrInterface, result, referenced);
@@ -523,7 +522,7 @@ public class ASTToTargetAST {
             usedTPHsOfMethods.put(method, usedTphs);
 
             eliminateInnerTypeVariables(referenced, result);
-            addMissingObjectBounds(result, classGenerics);
+            addMissingObjectBounds(result, classGenerics, usedTphs);
 
             System.out.println(this.getClass().getSimpleName() + " " + method.name + ": " + result);
             return result;
@@ -582,7 +581,7 @@ public class ASTToTargetAST {
             }
         }
 
-        abstract void generics(ClassOrInterface classOrInterface, Set<ResultPair<?, ?>> result);
+        abstract void generics(ClassOrInterface classOrInterface, Set<ResultPair<?, ?>> result, Set<TypePlaceholder> referenced);
 
         Set<ResultPair<?, ?>> generics(ClassOrInterface classOrInterface) {
             if (computedGenericsOfClasses.containsKey(classOrInterface))
@@ -595,24 +594,31 @@ public class ASTToTargetAST {
                 findAllBounds(field.getType(), javaResult, equality);
             }
 
+            var referenced = new HashSet<TypePlaceholder>();
             eliminateTransitives(javaResult);
-            generics(classOrInterface, javaResult);
+            generics(classOrInterface, javaResult, referenced);
-            addMissingObjectBounds(javaResult, null);
+
+            var referencedByClass = new HashSet<TypePlaceholder>();
+            for (var field : classOrInterface.getFieldDecl()) {
+                findTphs(field.getType(), referencedByClass);
+            }
+
+            addMissingObjectBounds(javaResult, null, referencedByClass);
 
             System.out.println(this.getClass().getSimpleName() + " Class " + classOrInterface.getClassName().getClassName() + ": " + javaResult);
             return javaResult;
         }
 
-        void addMissingObjectBounds(Set<ResultPair<?,?>> result, Set<ResultPair<?, ?>> classGenerics) {
+        void addMissingObjectBounds(Set<ResultPair<?,?>> result, Set<ResultPair<?, ?>> classGenerics, Set<TypePlaceholder> usedTphs) {
-            outer: for (var p1 : new HashSet<>(result)) {
+            outer: for (var tph : usedTphs) {
-                if (p1 instanceof PairTPHsmallerTPH ptph) {
+                tph = equality.getOrDefault(tph, tph);
-                    for (var p2 : new HashSet<>(result)) {
+                for (var p1 : new HashSet<>(result)) {
-                        if (ptph.right.equals(p2.getLeft()))
+                    if (p1.getLeft().equals(tph)) continue outer;
-                            continue outer;
-                    }
-                    if (classGenerics == null || classGenerics.stream().noneMatch((pair) -> pair.getLeft().equals(ptph.right)))
-                        addToPairs(result, new PairTPHequalRefTypeOrWildcardType(ptph.right, OBJECT));
                 }
+
+                TypePlaceholder finalTph = tph;
+                if (classGenerics == null || classGenerics.stream().noneMatch((pair) -> pair.getLeft().equals(finalTph)))
+                    addToPairs(result, new PairTPHequalRefTypeOrWildcardType(tph, OBJECT));
             }
         }
 
@@ -1136,6 +1142,19 @@ public class ASTToTargetAST {
         return convert(input, generics.javaGenerics);
     }
 
+    static TargetType flattenFunNType(List<TargetType> params) {
+        var newParams = new ArrayList<TargetType>();
+        for (var i = 0; i < params.size(); i++) {
+            var param = params.get(i);
+            if (param instanceof TargetSpecializedType fn) {
+                newParams.addAll(fn.params());
+            } else {
+                newParams.add(param);
+            }
+        }
+        return TargetFunNType.fromParams(params, newParams);
+    }
+
     protected TargetType convert(RefTypeOrTPHOrWildcardOrGeneric input, GenerateGenerics generics) {
         return input.acceptTV(new TypeVisitor<>() {
             @Override
@@ -1158,7 +1177,7 @@ public class ASTToTargetAST {
                         var clazz = classLoader.loadClass(code);
                         auxiliaries.put(clazz.getName(), code);
                     }
-                    return new TargetFunNType(params.size() - 1, params);
+                    return flattenFunNType(params);
                 }
                 return new TargetRefType(name, params);
             }

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

@@ -28,6 +28,8 @@ public class GenericsResultSet extends AbstractSet<ResultPair<?, ?>> {
 
     public Optional<ResultPair<?, ?>> getResultPairFor(TypePlaceholder tph) {
         var tph2 = equality.getOrDefault(tph, tph);
-        return this.stream().filter(pair -> pair.getLeft().equals(tph2)).findFirst();
+        return this.stream().filter(pair -> {
+            return pair.getLeft().equals(tph2);
+        }).findFirst();
     }
 }

src/main/java/de/dhbwstuttgart/target/tree/type/TargetFunNType.java

@@ -4,16 +4,20 @@ import de.dhbwstuttgart.bytecode.FunNGenerator;
 
 import java.util.List;
 
-public record TargetFunNType(int N, List<TargetType> params) implements TargetSpecializedType {
+public record TargetFunNType(String name, List<TargetType> params) implements TargetSpecializedType {
 
-    @Override
+    public static TargetFunNType fromParams(List<TargetType> params) {
-    public String getInternalName() {
+        return fromParams(params, params);
-        return FunNGenerator.getSpecializedClassName(FunNGenerator.getArguments(params), FunNGenerator.getReturnType(params));
+    }
+
+    public static TargetFunNType fromParams(List<TargetType> params, List<TargetType> realParams) {
+        var name = FunNGenerator.getSpecializedClassName(FunNGenerator.getArguments(params), FunNGenerator.getReturnType(params));
+        return new TargetFunNType(name, realParams);
     }
 
     @Override
-    public String name() {
+    public String getInternalName() {
-        return getInternalName();
+        return name;
     }
 
     @Override

src/main/java/de/dhbwstuttgart/typedeployment/TypeInsertFactory.java

@@ -186,7 +186,13 @@ class TypeToInsertString implements ResultSetVisitor{
 
     @Override
     public void visit(TypePlaceholder typePlaceholder) {
-        insert += ((TypePlaceholder) constraints.getResultPairFor(typePlaceholder).get().getLeft()).getName();
+        ResultPair<?, ?> resultPair = null;
+        if (constraints != null)
+            resultPair = constraints.getResultPairFor(typePlaceholder).orElse(null);
+        if (resultPair == null)
+            resultPair = classConstraints.getResultPairFor(typePlaceholder).get();
+
+        insert += ((TypePlaceholder)resultPair.getLeft()).getName();
     }
 
     @Override

src/test/java/targetast/TestCodegen.java

@@ -17,6 +17,7 @@ import static org.junit.Assert.*;
 import org.objectweb.asm.Opcodes;
 
 import java.io.IOException;
+import java.lang.annotation.Target;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.StandardOpenOption;
@@ -341,7 +342,7 @@ public class TestCodegen {
     public void testLambda() throws Exception {
         var classLoader = new ByteArrayClassLoader();
         //var fun = classLoader.loadClass(Path.of(System.getProperty("user.dir"), "src/test/java/targetast/Fun1$$.class"));
-        var interfaceType = new TargetFunNType(1, List.of(TargetType.Integer));
+        var interfaceType = TargetFunNType.fromParams(List.of(TargetType.Integer));
 
         var targetClass = new TargetClass(Opcodes.ACC_PUBLIC, "CGLambda");
         targetClass.addConstructor(Opcodes.ACC_PUBLIC, List.of(), new TargetBlock(List.of(