'val' now fully works on javac, even when referring to lombok-generated code, by (ab)using the annotation processor's round system. This breaks delombok though. That'll have to be fixed next.

src/core/lombok/javac/JavacTransformer.java

@@ -42,7 +42,7 @@ public class JavacTransformer {
 		this.handlers = HandlerLibrary.load(messager);
 	}
 	
-	public boolean transform(Context context, java.util.List<JCCompilationUnit> compilationUnitsRaw) {
+	public boolean transform(boolean postResolution, Context context, java.util.List<JCCompilationUnit> compilationUnitsRaw) {
 		List<JCCompilationUnit> compilationUnits;
 		if (compilationUnitsRaw instanceof List<?>) {
 			compilationUnits = (List<JCCompilationUnit>)compilationUnitsRaw;
@@ -57,22 +57,25 @@ public class JavacTransformer {
 		
 		for (JCCompilationUnit unit : compilationUnits) asts.add(new JavacAST(messager, context, unit));
 		
-		handlers.setPreResolutionPhase();
-		for (JavacAST ast : asts) {
-			ast.traverse(new AnnotationVisitor());
-			handlers.callASTVisitors(ast);
+		if (!postResolution) {
+			handlers.setPreResolutionPhase();
+			for (JavacAST ast : asts) {
+				ast.traverse(new AnnotationVisitor());
+				handlers.callASTVisitors(ast);
+			}
 		}
 		
-		handlers.setPostResolutionPhase();
-		for (JavacAST ast : asts) {
-			ast.traverse(new AnnotationVisitor());
-			handlers.callASTVisitors(ast);
-		}
-		
-		
-		handlers.setPrintASTPhase();
-		for (JavacAST ast : asts) {
-			ast.traverse(new AnnotationVisitor());
+		if (postResolution) {
+			handlers.setPostResolutionPhase();
+			for (JavacAST ast : asts) {
+				ast.traverse(new AnnotationVisitor());
+				handlers.callASTVisitors(ast);
+			}
+			
+			handlers.setPrintASTPhase();
+			for (JavacAST ast : asts) {
+				ast.traverse(new AnnotationVisitor());
+			}
 		}
 		
 		for (JavacAST ast : asts) {

src/core/lombok/javac/apt/InterceptingJavaFileManager.java

@@ -21,13 +21,19 @@
  */
 package lombok.javac.apt;
 
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.URI;
 import java.util.Iterator;
 import java.util.Set;
 
 import javax.tools.FileObject;
 import javax.tools.JavaFileManager;
 import javax.tools.JavaFileObject;
+import javax.tools.SimpleJavaFileObject;
 import javax.tools.JavaFileObject.Kind;
 
 import lombok.core.DiagnosticsReceiver;
@@ -42,6 +48,22 @@ final class InterceptingJavaFileManager implements JavaFileManager {
 	}
 	
 	@Override public JavaFileObject getJavaFileForOutput(Location location, String className, Kind kind, FileObject sibling) throws IOException {
+		if (className.startsWith("lombok.dummy.ForceNewRound")) {
+			String name = className.replace(".", "/") + kind.extension;
+			return new SimpleJavaFileObject(URI.create(name), kind) {
+				@Override public OutputStream openOutputStream() throws IOException {
+					return new ByteArrayOutputStream();
+				}
+				
+				@Override public InputStream openInputStream() throws IOException {
+					return new ByteArrayInputStream(new byte[0]);
+				}
+				
+				@Override public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
+					return "";
+				}
+			};
+		}
 		JavaFileObject fileObject = delegate.getJavaFileForOutput(location, className, kind, sibling);
 		if (kind != Kind.CLASS) {
 			return fileObject;

src/core/lombok/javac/apt/Processor.java

@@ -23,6 +23,7 @@ package lombok.javac.apt;
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.Writer;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.net.URL;
@@ -41,7 +42,9 @@ import javax.annotation.processing.SupportedSourceVersion;
 import javax.lang.model.SourceVersion;
 import javax.lang.model.element.Element;
 import javax.lang.model.element.TypeElement;
+import javax.tools.Diagnostic.Kind;
 import javax.tools.JavaFileManager;
+import javax.tools.JavaFileObject;
 
 import lombok.Lombok;
 import lombok.core.DiagnosticsReceiver;
@@ -49,6 +52,7 @@ import lombok.javac.JavacTransformer;
 
 import com.sun.source.util.TreePath;
 import com.sun.source.util.Trees;
+import com.sun.tools.javac.processing.JavacFiler;
 import com.sun.tools.javac.processing.JavacProcessingEnvironment;
 import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
 import com.sun.tools.javac.util.Context;
@@ -75,12 +79,12 @@ public class Processor extends AbstractProcessor {
 	@Override public void init(ProcessingEnvironment procEnv) {
 		super.init(procEnv);
 		this.processingEnv = (JavacProcessingEnvironment) procEnv;
-		placePostCompileHook();
+		placePostCompileAndDontMakeForceRoundDummiesHook();
 		transformer = new JavacTransformer(procEnv.getMessager());
 		trees = Trees.instance(procEnv);
 	}
 	
-	private void placePostCompileHook() {
+	private void placePostCompileAndDontMakeForceRoundDummiesHook() {
 		stopJavacProcessingEnvironmentFromClosingOurClassloader();
 		
 		Context context = processingEnv.getContext();
@@ -101,6 +105,9 @@ public class Processor extends AbstractProcessor {
 				
 				JavaFileManager newFiler = new InterceptingJavaFileManager(originalFiler, receiver);
 				ht.put(key, newFiler);
+				Field filerFileManagerField = JavacFiler.class.getDeclaredField("fileManager");
+				filerFileManagerField.setAccessible(true);
+				filerFileManagerField.set(processingEnv.getFiler(), newFiler);
 			}
 		} catch (Exception e) {
 			throw Lombok.sneakyThrow(e);
@@ -165,15 +172,43 @@ public class Processor extends AbstractProcessor {
 		}
 	}
 	
+	private final IdentityHashMap<JCCompilationUnit, Void> rootsAtPhase0 = new IdentityHashMap<JCCompilationUnit, Void>();
+	private final IdentityHashMap<JCCompilationUnit, Void> rootsAtPhase1 = new IdentityHashMap<JCCompilationUnit, Void>();
+	private int dummyCount = 0;
+	
 	/** {@inheritDoc} */
 	@Override public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
-		IdentityHashMap<JCCompilationUnit, Void> units = new IdentityHashMap<JCCompilationUnit, Void>();
-		for (Element element : roundEnv.getRootElements()) {
-			JCCompilationUnit unit = toUnit(element);
-			if (unit != null) units.put(unit, null);
+		if (roundEnv.processingOver()) return false;
+		
+		if (!rootsAtPhase0.isEmpty()) {
+			ArrayList<JCCompilationUnit> cus = new ArrayList<JCCompilationUnit>(rootsAtPhase0.keySet());
+			transformer.transform(true, processingEnv.getContext(), cus);
+			rootsAtPhase1.putAll(rootsAtPhase0);
+			rootsAtPhase0.clear();
 		}
 		
-		transformer.transform(processingEnv.getContext(), new ArrayList<JCCompilationUnit>(units.keySet()));
+		for (Element element : roundEnv.getRootElements()) {
+			JCCompilationUnit unit = toUnit(element);
+			if (unit != null) {
+				if (!rootsAtPhase1.containsKey(unit)) rootsAtPhase0.put(unit, null);
+			}
+		}
+		
+		if (!rootsAtPhase0.isEmpty()) {
+			ArrayList<JCCompilationUnit> cus = new ArrayList<JCCompilationUnit>(rootsAtPhase0.keySet());
+			transformer.transform(false, processingEnv.getContext(), cus);
+			JavacFiler filer = (JavacFiler) processingEnv.getFiler();
+			if (!filer.newFiles()) {
+				try {
+					JavaFileObject dummy = filer.createSourceFile("lombok.dummy.ForceNewRound" + (dummyCount++));
+					Writer w = dummy.openWriter();
+					w.close();
+				} catch (Exception e) {
+					processingEnv.getMessager().printMessage(Kind.WARNING,
+							"Can't force a new processing round. Lombok features that require resolution won't work.");
+				}
+			}
+		}
 		
 		return false;
 	}

src/core/lombok/javac/handlers/HandleVal.java

@@ -31,10 +31,8 @@ import org.mangosdk.spi.ProviderFor;
 import com.sun.tools.javac.code.Flags;
 import com.sun.tools.javac.code.Type;
 import com.sun.tools.javac.tree.JCTree;
-import com.sun.tools.javac.tree.JCTree.JCClassDecl;
 import com.sun.tools.javac.tree.JCTree.JCEnhancedForLoop;
 import com.sun.tools.javac.tree.JCTree.JCExpression;
-import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
 import com.sun.tools.javac.tree.JCTree.JCNewArray;
 import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
 

src/delombok/lombok/delombok/Delombok.java

@@ -384,7 +384,8 @@ public class Delombok {
 		
 		for (JCCompilationUnit unit : roots) {
 			// Run one single massive transform instead of a lot of singleton calls, as this causes a heck of a lot of refilling of the enter cache.
-			boolean changed = new JavacTransformer(messager).transform(context, Collections.singletonList(unit));
+			// XXX This isn't enough - we need to call transform again after resetting everything.
+			boolean changed = new JavacTransformer(messager).transform(false, context, Collections.singletonList(unit));
 			DelombokResult result = new DelombokResult(commentsMap.get(unit).comments, unit, force || changed);
 			if (verbose) feedback.printf("File: %s [%s]\n", unit.sourcefile.getName(), result.isChanged() ? "delomboked" : "unchanged");
 			Writer rawWriter;