8160454: JSR269 jigsaw update: javax.lang.model.element.ModuleElement.getDirectives() causes NPE on unnamed modules

Reviewed-by: jjg

langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/code/Symbol.java

@@ -928,11 +928,6 @@ public abstract class Symbol extends AnnoConstruct implements Element {
             return msym;
         }
 
-        public ModuleSymbol() {
-            super(MDL, 0, null, null, null);
-            this.type = new ModuleType(this);
-        }
-
         public ModuleSymbol(Name name, Symbol owner) {
             super(MDL, 0, name, null, owner);
             this.type = new ModuleType(this);

langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/code/Symtab.java

@@ -27,6 +27,7 @@ package com.sun.tools.javac.code;
 
 import java.util.Collection;
 import java.util.Collections;
+import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.Map;
@@ -363,6 +364,17 @@ public class Symtab {
 
         // create the basic builtin symbols
         unnamedModule = new ModuleSymbol(names.empty, null) {
+                {
+                    directives = List.nil();
+                    exports = List.nil();
+                    provides = List.nil();
+                    uses = List.nil();
+                    ModuleSymbol java_base = enterModule(names.java_base);
+                    com.sun.tools.javac.code.Directive.RequiresDirective d =
+                            new com.sun.tools.javac.code.Directive.RequiresDirective(java_base,
+                                    EnumSet.of(com.sun.tools.javac.code.Directive.RequiresFlag.MANDATED));
+                    requires = List.of(d);
+                }
                 @Override
                 public String toString() {
                     return messages.getLocalizedString("compiler.misc.unnamed.module");

langtools/test/tools/javac/modules/T8160454/NPEGetDirectivesTest.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2016, 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.
+ */
+
+/*
+ * @test
+ * @bug 8160454
+ * @summary JSR269 jigsaw update: javax.lang.model.element.ModuleElement.getDirectives() causes NPE on unnamed modules
+ * @modules
+ *      jdk.compiler/com.sun.tools.javac.code
+ *      jdk.compiler/com.sun.tools.javac.util
+ * @compile NPEGetDirectivesTest.java
+ * @compile -processor NPEGetDirectivesTest NPEGetDirectivesTest.java
+ */
+
+import javax.annotation.processing.AbstractProcessor;
+import javax.annotation.processing.RoundEnvironment;
+import javax.annotation.processing.SupportedAnnotationTypes;
+import javax.lang.model.SourceVersion;
+import javax.lang.model.element.*;
+
+import java.util.Set;
+
+import com.sun.tools.javac.code.Directive.RequiresDirective;
+import com.sun.tools.javac.code.Symbol.ModuleSymbol;
+import com.sun.tools.javac.util.Assert;
+
+import static com.sun.tools.javac.code.Directive.RequiresFlag.MANDATED;
+
+@SupportedAnnotationTypes("*")
+public class NPEGetDirectivesTest extends AbstractProcessor {
+    @Override
+    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
+        for (Element e: roundEnv.getRootElements()) {
+            Element m = e.getEnclosingElement();
+            while (!(m instanceof ModuleElement)) {
+                m = m.getEnclosingElement();
+            }
+            ((ModuleSymbol)m).getDirectives();
+            RequiresDirective requiresDirective = ((ModuleSymbol)m).requires.head;
+            Assert.check(requiresDirective.getDependency().getQualifiedName().toString().equals("java.base"));
+            Assert.check(requiresDirective.flags.contains(MANDATED));
+        }
+        return false;
+    }
+
+    @Override
+    public SourceVersion getSupportedSourceVersion() {
+        return SourceVersion.latest();
+    }
+}