Adds support of Class.getDeclaringClass method

teavm-classlib/src/main/java/org/teavm/classlib/impl/NewInstanceDependencySupport.java

@@ -24,6 +24,7 @@ import org.teavm.model.*;
  */
 public class NewInstanceDependencySupport implements DependencyListener {
     private DependencyNode allClassesNode;
+    private DependencyStack newInstanceStack;
 
     @Override
     public void started(DependencyChecker dependencyChecker) {
@@ -36,19 +37,31 @@ public class NewInstanceDependencySupport implements DependencyListener {
         if (cls.hasModifier(ElementModifier.ABSTRACT) || cls.hasModifier(ElementModifier.INTERFACE)) {
             return;
         }
-        if (cls.getMethod(new MethodDescriptor("<init>", ValueType.VOID)) != null) {
+        MethodReader method = cls.getMethod(new MethodDescriptor("<init>", ValueType.VOID));
+        if (method != null) {
             allClassesNode.propagate(className);
         }
     }
 
     @Override
-    public void methodAchieved(DependencyChecker dependencyChecker, MethodDependency method) {
+    public void methodAchieved(final DependencyChecker dependencyChecker, MethodDependency method) {
         MethodReader reader = method.getMethod();
         if (reader.getOwnerName().equals("java.lang.Class") && reader.getName().equals("newInstance")) {
+            newInstanceStack = method.getStack();
             allClassesNode.connect(method.getResult());
+            method.getResult().addConsumer(new DependencyConsumer() {
+                @Override public void consume(String type) {
+                    attachConstructor(dependencyChecker, type);
+                }
+            });
         }
     }
 
+    private void attachConstructor(DependencyChecker checker, String type) {
+        MethodReference ref = new MethodReference(type, new MethodDescriptor("<init>", ValueType.VOID));
+        checker.linkMethod(ref, newInstanceStack).use();
+    }
+
     @Override
     public void fieldAchieved(DependencyChecker dependencyChecker, FieldDependency field) {
     }

teavm-classlib/src/main/java/org/teavm/classlib/java/lang/ClassNativeGenerator.java

@@ -47,6 +47,9 @@ public class ClassNativeGenerator implements Generator, Injector, DependencyPlug
             case "newInstance":
                 generateNewInstance(context, writer);
                 break;
+            case "getDeclaringClass":
+                generateGetDeclaringClass(context, writer);
+                break;
         }
     }
 
@@ -141,8 +144,27 @@ public class ClassNativeGenerator implements Generator, Injector, DependencyPlug
         writer.append("$rt_throw(ex);").softNewLine();
         writer.outdent().append("}").softNewLine();
         writer.append("var instance = new cls();").softNewLine();
-        writer.append("ctor(instance)");
+        writer.append("ctor(instance);").softNewLine();
-        writer.append("return instance");
+        writer.append("return instance;").softNewLine();
+    }
+
+    private void generateGetDeclaringClass(GeneratorContext context, SourceWriter writer) throws IOException {
+        String self = context.getParameterName(0);
+        writer.append("if (!").appendClass("java.lang.Class").append(".$$owners$$) {").indent().softNewLine();
+        writer.appendClass("java.lang.Class").append(".$$owners$$ = true;").softNewLine();
+        for (String clsName : context.getClassSource().getClassNames()) {
+            ClassReader cls = context.getClassSource().get(clsName);
+            writer.appendClass(clsName).append(".$$owner$$ = ");
+            if (cls.getOwnerName() != null) {
+                writer.appendClass(cls.getOwnerName());
+            } else {
+                writer.append("null");
+            }
+            writer.append(";").softNewLine();
+        }
+        writer.outdent().append("}").softNewLine();
+        writer.append("var cls = " + self + ".$data;").softNewLine();
+        writer.append("return cls.$$owner$$ != null ? $rt_cls(cls.$$owner$$) : null;").softNewLine();
     }
 
     @Override
@@ -154,6 +176,7 @@ public class ClassNativeGenerator implements Generator, Injector, DependencyPlug
             case "getSuperclass":
             case "getComponentType0":
             case "forNameImpl":
+            case "getDeclaringClass":
                 graph.getResult().propagate("java.lang.Class");
                 break;
         }

teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TClass.java

@@ -134,4 +134,8 @@ public class TClass<T extends TObject> extends TObject {
 
     @GeneratedBy(ClassNativeGenerator.class)
     public native T newInstance() throws TInstantiationException, TIllegalAccessException;
+
+    @GeneratedBy(ClassNativeGenerator.class)
+    @PluggableDependency(ClassNativeGenerator.class)
+    public native TClass<?> getDeclaringClass();
 }

teavm-classlib/src/test/java/org/teavm/classlib/java/lang/ClassTest.java

@@ -97,4 +97,12 @@ public class ClassTest {
         assertEquals(TestObject.class, instance.getClass());
         assertEquals(1, ((TestObject)instance).getCounter());
     }
+
+    @Test
+    public void declaringClassFound() {
+        assertEquals(ClassTest.class, new A().getClass().getDeclaringClass());
+    }
+
+    private static class A {
+    }
 }

teavm-core/src/main/java/org/teavm/model/ClassHolder.java

@@ -26,6 +26,7 @@ public class ClassHolder extends ElementHolder implements ClassReader {
     private Set<String> interfaces = new HashSet<>();
     private Map<MethodDescriptor, MethodHolder> methods = new HashMap<>();
     private Map<String, FieldHolder> fields = new HashMap<>();
+    private String ownerName;
 
     public ClassHolder(String name) {
         super(name);
@@ -106,4 +107,13 @@ public class ClassHolder extends ElementHolder implements ClassReader {
         fields.remove(field.getName());
         field.setOwner(null);
     }
+
+    @Override
+    public String getOwnerName() {
+        return ownerName;
+    }
+
+    public void setOwnerName(String ownerName) {
+        this.ownerName = ownerName;
+    }
 }

teavm-core/src/main/java/org/teavm/model/ClassReader.java

@@ -34,4 +34,6 @@ public interface ClassReader extends ElementReader {
     FieldReader getField(String name);
 
     Collection<? extends FieldReader> getFields();
+
+    String getOwnerName();
 }

teavm-core/src/main/java/org/teavm/model/CopyClassHolderSource.java

@@ -59,6 +59,7 @@ public class CopyClassHolderSource implements ClassHolderSource {
         for (FieldHolder field : original.getFields()) {
             copy.addField(copyField(field));
         }
+        copy.setOwnerName(original.getOwnerName());
         copyAnnotations(original.getAnnotations(), copy.getAnnotations());
         return copy;
     }

teavm-core/src/main/java/org/teavm/parsing/ClassRefsRenamer.java

@@ -57,6 +57,9 @@ class ClassRefsRenamer implements InstructionVisitor {
             cls.removeField(field);
             renamedCls.addField(field);
         }
+        if (cls.getOwnerName() != null) {
+            renamedCls.setOwnerName(classNameMapper.map(cls.getOwnerName()));
+        }
         rename(cls.getAnnotations(), renamedCls.getAnnotations());
         for (String iface : cls.getInterfaces()) {
             renamedCls.getInterfaces().add(classNameMapper.map(iface));

teavm-core/src/main/java/org/teavm/parsing/Parser.java

@@ -64,6 +64,14 @@ public class Parser {
             MethodNode methodNode = (MethodNode)obj;
             cls.addMethod(parseMethod(methodNode, node.name));
         }
+        if (node.outerClass != null) {
+            cls.setOwnerName(node.outerClass.replace('/', '.'));
+        } else {
+            int lastIndex = node.name.lastIndexOf('$');
+            if (lastIndex != -1) {
+                cls.setOwnerName(node.name.substring(0, lastIndex).replace('/', '.'));
+            }
+        }
         parseAnnotations(cls.getAnnotations(), node);
         return cls;
     }