/* * Copyright (c) 2003, 2015, 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. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * 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 sun.reflect; import java.lang.reflect.*; /** Provides reflective access to the constant pools of classes. Currently this is needed to provide reflective access to annotations but may be used by other internal subsystems in the future. */ public class ConstantPool { // Number of entries in this constant pool (= maximum valid constant pool index) public int getSize() { return getSize0 (constantPoolOop); } public Class getClassAt (int index) { return getClassAt0 (constantPoolOop, index); } public Class getClassAtIfLoaded (int index) { return getClassAtIfLoaded0 (constantPoolOop, index); } // Returns a class reference index for a method or a field. public int getClassRefIndexAt (int index) { return getClassRefIndexAt0 (constantPoolOop, index); } // Returns either a Method or Constructor. // Static initializers are returned as Method objects. public Member getMethodAt (int index) { return getMethodAt0 (constantPoolOop, index); } public Member getMethodAtIfLoaded(int index) { return getMethodAtIfLoaded0(constantPoolOop, index); } public Field getFieldAt (int index) { return getFieldAt0 (constantPoolOop, index); } public Field getFieldAtIfLoaded (int index) { return getFieldAtIfLoaded0 (constantPoolOop, index); } // Fetches the class name, member (field, method or interface // method) name, and type descriptor as an array of three Strings public String[] getMemberRefInfoAt (int index) { return getMemberRefInfoAt0 (constantPoolOop, index); } // Returns a name and type reference index for a method, a field or an invokedynamic. public int getNameAndTypeRefIndexAt (int index) { return getNameAndTypeRefIndexAt0 (constantPoolOop, index); } // Fetches the name and type from name_and_type index as an array of two Strings public String[] getNameAndTypeRefInfoAt (int index) { return getNameAndTypeRefInfoAt0 (constantPoolOop, index); } public int getIntAt (int index) { return getIntAt0 (constantPoolOop, index); } public long getLongAt (int index) { return getLongAt0 (constantPoolOop, index); } public float getFloatAt (int index) { return getFloatAt0 (constantPoolOop, index); } public double getDoubleAt (int index) { return getDoubleAt0 (constantPoolOop, index); } public String getStringAt (int index) { return getStringAt0 (constantPoolOop, index); } public String getUTF8At (int index) { return getUTF8At0 (constantPoolOop, index); } public Tag getTagAt (int index) { return Tag.valueOf( getTagAt0 (constantPoolOop, index));} public static enum Tag { UTF8, INTEGER, FLOAT, LONG, DOUBLE, CLASS, STRING, FIELDREF, METHODREF, INTERFACEMETHODREF, NAMEANDTYPE, METHODHANDLE, METHODTYPE, INVOKEDYNAMIC, INVALID, UNRESOLVED_CLASS, CLASS_INDEX, STRING_INDEX, UNRESOLVED_CLASS_IN_ERROR, METHODHANDLE_IN_ERROR, METHODTYPE_IN_ERROR; private static Tag valueOf(byte v) { switch (v) { case 0: return INVALID; case 1: return UTF8; case 3: return INTEGER; case 4: return FLOAT; case 5: return LONG; case 6: return DOUBLE; case 7: return CLASS; case 8: return STRING; case 9: return FIELDREF; case 10: return METHODREF; case 11: return INTERFACEMETHODREF; case 12: return NAMEANDTYPE; case 15: return METHODHANDLE; case 16: return METHODTYPE; case 18: return INVOKEDYNAMIC; // The tags 100 - 105 are hotspot specific ones // (not from JVM spec) used in constantTag.hpp case 100: return UNRESOLVED_CLASS; case 101: return CLASS_INDEX; case 102: return STRING_INDEX; case 103: return UNRESOLVED_CLASS_IN_ERROR; case 104: return METHODHANDLE_IN_ERROR; case 105: return METHODTYPE_IN_ERROR; default: throw new IllegalArgumentException("Unknown constant pool tag " + v); } } } //--------------------------------------------------------------------------- // Internals only below this point // static { Reflection.registerFieldsToFilter(ConstantPool.class, new String[] { "constantPoolOop" }); } // HotSpot-internal constant pool object (set by the VM, name known to the VM) private Object constantPoolOop; private native int getSize0 (Object constantPoolOop); private native Class getClassAt0 (Object constantPoolOop, int index); private native Class getClassAtIfLoaded0 (Object constantPoolOop, int index); private native int getClassRefIndexAt0 (Object constantPoolOop, int index); private native Member getMethodAt0 (Object constantPoolOop, int index); private native Member getMethodAtIfLoaded0(Object constantPoolOop, int index); private native Field getFieldAt0 (Object constantPoolOop, int index); private native Field getFieldAtIfLoaded0 (Object constantPoolOop, int index); private native String[] getMemberRefInfoAt0 (Object constantPoolOop, int index); private native int getNameAndTypeRefIndexAt0 (Object constantPoolOop, int index); private native String[] getNameAndTypeRefInfoAt0 (Object constantPoolOop, int index); private native int getIntAt0 (Object constantPoolOop, int index); private native long getLongAt0 (Object constantPoolOop, int index); private native float getFloatAt0 (Object constantPoolOop, int index); private native double getDoubleAt0 (Object constantPoolOop, int index); private native String getStringAt0 (Object constantPoolOop, int index); private native String getUTF8At0 (Object constantPoolOop, int index); private native byte getTagAt0 (Object constantPoolOop, int index); }