ART: Add Field methods

Add GetFieldName, GetFieldDeclaringClass, GetFieldModifiers
and IsFieldSynthetic support. Add tests.

Bug: 34113943
Test: m test-art-host-run-test-918-fields
Change-Id: Id33b8c54c250f73f0658ec45ccb2b55eccb37623
diff --git a/test/918-fields/src/Main.java b/test/918-fields/src/Main.java
new file mode 100644
index 0000000..8af6e7b
--- /dev/null
+++ b/test/918-fields/src/Main.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.lang.reflect.Field;
+import java.util.Arrays;
+
+public class Main {
+  public static void main(String[] args) throws Exception {
+    System.loadLibrary(args[1]);
+
+    doTest();
+  }
+
+  public static void doTest() throws Exception {
+    testField(Math.class, "PI");
+    testField(Integer.class, "value");
+    testField(Foo.class, "this$0");
+    testField(Bar.class, "VAL");
+  }
+
+  private static void testField(Class<?> base, String fieldName)
+      throws Exception {
+    Field f = base.getDeclaredField(fieldName);
+    String[] result = getFieldName(f);
+    System.out.println(Arrays.toString(result));
+
+    Class<?> declClass = getFieldDeclaringClass(f);
+    if (base != declClass) {
+      throw new RuntimeException("Declaring class not equal: " + base + " vs " + declClass);
+    }
+    System.out.println(declClass);
+
+    int modifiers = getFieldModifiers(f);
+    if (modifiers != f.getModifiers()) {
+      throw new RuntimeException("Modifiers not equal: " + f.getModifiers() + " vs " + modifiers);
+    }
+    System.out.println(modifiers);
+
+    boolean synth = isFieldSynthetic(f);
+    if (synth != f.isSynthetic()) {
+      throw new RuntimeException("Synthetic not equal: " + f.isSynthetic() + " vs " + synth);
+    }
+    System.out.println(synth);
+  }
+
+  private static native String[] getFieldName(Field f);
+  private static native Class<?> getFieldDeclaringClass(Field f);
+  private static native int getFieldModifiers(Field f);
+  private static native boolean isFieldSynthetic(Field f);
+
+  private class Foo {
+  }
+
+  private static interface Bar {
+    public static int VAL = 1;
+  }
+}