--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/verify/VerifyTruffleProcessor.java	Wed Jun 17 10:58:08 2015 +0200
@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.dsl.processor.verify;
+
+import static com.oracle.truffle.dsl.processor.java.ElementUtils.*;
+import static java.util.Collections.*;
+
+import java.io.*;
+import java.util.*;
+
+import javax.annotation.processing.*;
+import javax.lang.model.*;
+import javax.lang.model.element.*;
+import javax.tools.Diagnostic.Kind;
+
+import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
+import com.oracle.truffle.api.nodes.Node.Child;
+import com.oracle.truffle.dsl.processor.*;
+
+@SupportedAnnotationTypes({"com.oracle.truffle.api.CompilerDirectives.TruffleBoundary", "com.oracle.truffle.api.nodes.Node.Child"})
+public class VerifyTruffleProcessor extends AbstractProcessor {
+    @Override
+    public SourceVersion getSupportedSourceVersion() {
+        return SourceVersion.latest();
+    }
+
+    /**
+     * Node class currently being processed.
+     */
+    private Element scope;
+
+    public static boolean isEnclosedIn(Element e, Element scopeElement) {
+        List<Element> elementHierarchy = getElementHierarchy(e);
+        return elementHierarchy.contains(scopeElement);
+    }
+
+    void errorMessage(Element element, String format, Object... args) {
+        message(Kind.ERROR, element, format, args);
+    }
+
+    void message(Kind kind, Element element, String format, Object... args) {
+        if (scope != null && !isEnclosedIn(element, scope)) {
+            // See https://bugs.eclipse.org/bugs/show_bug.cgi?id=428357#c1
+            List<Element> elementHierarchy = getElementHierarchy(element);
+            reverse(elementHierarchy);
+
+            StringBuilder str = new StringBuilder();
+            for (Element e : elementHierarchy) {
+                if (e.getKind() != ElementKind.PACKAGE) {
+                    str.append(str.length() == 0 ? "" : ".");
+                    str.append(e);
+                }
+            }
+            processingEnv.getMessager().printMessage(kind, String.format(str + ": " + format, args), scope);
+        } else {
+            processingEnv.getMessager().printMessage(kind, String.format(format, args), element);
+        }
+    }
+
+    /**
+     * Bugs in an annotation processor can cause silent failure so try to report any exception
+     * throws as errors.
+     */
+    private void reportException(Kind kind, Element element, Throwable t) {
+        StringWriter buf = new StringWriter();
+        t.printStackTrace(new PrintWriter(buf));
+        buf.toString();
+        message(kind, element, "Exception thrown during processing: %s", buf.toString());
+    }
+
+    @Override
+    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
+        if (roundEnv.processingOver()) {
+            return false;
+        }
+
+        TypeElement virtualFrameType = processingEnv.getElementUtils().getTypeElement("com.oracle.truffle.api.frame.VirtualFrame");
+
+        for (Element element : roundEnv.getElementsAnnotatedWith(TruffleBoundary.class)) {
+            scope = element;
+            try {
+                ExecutableElement method = (ExecutableElement) element;
+
+                for (VariableElement parameter : method.getParameters()) {
+                    Element paramType = processingEnv.getTypeUtils().asElement(parameter.asType());
+                    if (paramType != null && paramType.equals(virtualFrameType)) {
+                        errorMessage(element, "Method %s cannot be annotated with @%s and have a parameter of type %s", method.getSimpleName(), TruffleBoundary.class.getSimpleName(),
+                                        paramType.getSimpleName());
+                    }
+                }
+            } catch (Throwable t) {
+                reportException(isBug367599(t) ? Kind.NOTE : Kind.ERROR, element, t);
+            } finally {
+                scope = null;
+            }
+        }
+
+        for (Element e : roundEnv.getElementsAnnotatedWith(Child.class)) {
+            if (e.getModifiers().contains(Modifier.FINAL)) {
+                emitError("@Child field cannot be final", e);
+                continue;
+            }
+            assertNoErrorExpected(e);
+        }
+        return false;
+    }
+
+    void assertNoErrorExpected(Element element) {
+        ExpectError.assertNoErrorExpected(processingEnv, element);
+    }
+
+    void emitError(String message, Element element) {
+        if (ExpectError.isExpectedError(processingEnv, element, message)) {
+            return;
+        }
+        processingEnv.getMessager().printMessage(Kind.ERROR, message, element);
+    }
+
+    /**
+     * Determines if a given exception is (most likely) caused by <a
+     * href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=367599">Bug 367599</a>.
+     */
+    public static boolean isBug367599(Throwable t) {
+        if (t instanceof FilerException) {
+            for (StackTraceElement ste : t.getStackTrace()) {
+                if (ste.toString().contains("org.eclipse.jdt.internal.apt.pluggable.core.filer.IdeFilerImpl.create")) {
+                    // See: https://bugs.eclipse.org/bugs/show_bug.cgi?id=367599
+                    return true;
+                }
+            }
+        }
+        if (t.getCause() != null) {
+            return isBug367599(t.getCause());
+        }
+        return false;
+    }
+}