--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jvmci/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/JavaField.java	Tue Jun 09 00:22:49 2015 +0200
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2009, 2012, 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.jvmci.meta;
+
+import java.util.*;
+
+/**
+ * Represents a reference to a Java field, either resolved or unresolved fields. Fields, like
+ * methods and types, are resolved through {@link ConstantPool constant pools}.
+ */
+public interface JavaField extends TrustedInterface {
+
+    /**
+     * Returns the name of this field.
+     */
+    String getName();
+
+    /**
+     * Returns a {@link JavaType} object that identifies the declared type for this field.
+     */
+    JavaType getType();
+
+    /**
+     * Returns the kind of this field. This is the same as calling {@link #getType}.
+     * {@link JavaType#getKind getKind}.
+     */
+    default Kind getKind() {
+        return getType().getKind();
+    }
+
+    /**
+     * Returns the {@link JavaType} object representing the class or interface that declares this
+     * field.
+     */
+    JavaType getDeclaringClass();
+
+    /**
+     * Gets a string for this field formatted according to a given format specification. A format
+     * specification is composed of characters that are to be copied verbatim to the result and
+     * specifiers that denote an attribute of this field that is to be copied to the result. A
+     * specifier is a single character preceded by a '%' character. The accepted specifiers and the
+     * field attributes they denote are described below:
+     *
+     * <pre>
+     *     Specifier | Description                                          | Example(s)
+     *     ----------+------------------------------------------------------------------------------------------
+     *     'T'       | Qualified type                                       | "int" "java.lang.String"
+     *     't'       | Unqualified type                                     | "int" "String"
+     *     'H'       | Qualified holder                                     | "java.util.Map.Entry"
+     *     'h'       | Unqualified holder                                   | "Entry"
+     *     'n'       | Field name                                           | "age"
+     *     'f'       | Indicator if field is unresolved, static or instance | "unresolved" "static" "instance"
+     *     '%'       | A '%' character                                      | "%"
+     * </pre>
+     *
+     * @param format a format specification
+     * @return the result of formatting this field according to {@code format}
+     * @throws IllegalFormatException if an illegal specifier is encountered in {@code format}
+     */
+    default String format(String format) throws IllegalFormatException {
+        StringBuilder sb = new StringBuilder();
+        int index = 0;
+        JavaType type = getType();
+        while (index < format.length()) {
+            char ch = format.charAt(index++);
+            if (ch == '%') {
+                if (index >= format.length()) {
+                    throw new UnknownFormatConversionException("An unquoted '%' character cannot terminate a field format specification");
+                }
+                char specifier = format.charAt(index++);
+                boolean qualified = false;
+                switch (specifier) {
+                    case 'T':
+                        qualified = true;
+                        // fall through
+                    case 't': {
+                        sb.append(type.toJavaName(qualified));
+                        break;
+                    }
+                    case 'H':
+                        qualified = true;
+                        // fall through
+                    case 'h': {
+                        sb.append(getDeclaringClass().toJavaName(qualified));
+                        break;
+                    }
+                    case 'n': {
+                        sb.append(getName());
+                        break;
+                    }
+                    case 'f': {
+                        sb.append(!(this instanceof ResolvedJavaField) ? "unresolved" : ((ResolvedJavaField) this).isStatic() ? "static" : "instance");
+                        break;
+                    }
+                    case '%': {
+                        sb.append('%');
+                        break;
+                    }
+                    default: {
+                        throw new UnknownFormatConversionException(String.valueOf(specifier));
+                    }
+                }
+            } else {
+                sb.append(ch);
+            }
+        }
+        return sb.toString();
+    }
+}