jaxp/src/share/classes/com/sun/org/apache/bcel/internal/generic/ConstantPoolGen.java
changeset 6 7f561c08de6b
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jaxp/src/share/classes/com/sun/org/apache/bcel/internal/generic/ConstantPoolGen.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,789 @@
+/*
+ * reserved comment block
+ * DO NOT REMOVE OR ALTER!
+ */
+package com.sun.org.apache.bcel.internal.generic;
+
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2001 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution,
+ *    if any, must include the following acknowledgment:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgment may appear in the software itself,
+ *    if and wherever such third-party acknowledgments normally appear.
+ *
+ * 4. The names "Apache" and "Apache Software Foundation" and
+ *    "Apache BCEL" must not be used to endorse or promote products
+ *    derived from this software without prior written permission. For
+ *    written permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache",
+ *    "Apache BCEL", nor may "Apache" appear in their name, without
+ *    prior written permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+
+import com.sun.org.apache.bcel.internal.Constants;
+import com.sun.org.apache.bcel.internal.classfile.*;
+import java.util.HashMap;
+
+/**
+ * This class is used to build up a constant pool. The user adds
+ * constants via `addXXX' methods, `addString', `addClass',
+ * etc.. These methods return an index into the constant
+ * pool. Finally, `getFinalConstantPool()' returns the constant pool
+ * built up. Intermediate versions of the constant pool can be
+ * obtained with `getConstantPool()'. A constant pool has capacity for
+ * Constants.MAX_SHORT entries. Note that the first (0) is used by the
+ * JVM and that Double and Long constants need two slots.
+ *
+ * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
+ * @see Constant
+ */
+public class ConstantPoolGen implements java.io.Serializable {
+  protected int        size      = 1024; // Inital size, sufficient in most cases
+  protected Constant[] constants = new Constant[size];
+  protected int        index     = 1; // First entry (0) used by JVM
+
+  private static final String METHODREF_DELIM  = ":";
+  private static final String IMETHODREF_DELIM = "#";
+  private static final String FIELDREF_DELIM   = "&";
+  private static final String NAT_DELIM        = "%";
+
+  private static class Index implements java.io.Serializable {
+    int index;
+    Index(int i) { index = i; }
+  }
+
+  /**
+   * Initialize with given array of constants.
+   *
+   * @param c array of given constants, new ones will be appended
+   */
+  public ConstantPoolGen(Constant[] cs) {
+    if(cs.length > size) {
+      size      = cs.length;
+      constants = new Constant[size];
+    }
+
+    System.arraycopy(cs, 0, constants, 0, cs.length);
+
+    if(cs.length > 0)
+      index = cs.length;
+
+    for(int i=1; i < index; i++) {
+      Constant c = constants[i];
+
+      if(c instanceof ConstantString) {
+        ConstantString s  = (ConstantString)c;
+        ConstantUtf8   u8 = (ConstantUtf8)constants[s.getStringIndex()];
+
+        string_table.put(u8.getBytes(), new Index(i));
+      } else if(c instanceof ConstantClass) {
+        ConstantClass s  = (ConstantClass)c;
+        ConstantUtf8  u8 = (ConstantUtf8)constants[s.getNameIndex()];
+
+        class_table.put(u8.getBytes(), new Index(i));
+      } else if(c instanceof ConstantNameAndType) {
+        ConstantNameAndType n    = (ConstantNameAndType)c;
+        ConstantUtf8        u8   = (ConstantUtf8)constants[n.getNameIndex()];
+        ConstantUtf8        u8_2 = (ConstantUtf8)constants[n.getSignatureIndex()];
+
+        n_a_t_table.put(u8.getBytes() + NAT_DELIM + u8_2.getBytes(), new Index(i));
+       } else if(c instanceof ConstantUtf8) {
+         ConstantUtf8 u = (ConstantUtf8)c;
+
+         utf8_table.put(u.getBytes(), new Index(i));
+      } else if(c instanceof ConstantCP) {
+        ConstantCP          m     = (ConstantCP)c;
+        ConstantClass       clazz = (ConstantClass)constants[m.getClassIndex()];
+        ConstantNameAndType n     = (ConstantNameAndType)constants[m.getNameAndTypeIndex()];
+
+        ConstantUtf8 u8         = (ConstantUtf8)constants[clazz.getNameIndex()];
+        String       class_name = u8.getBytes().replace('/', '.');
+
+        u8 = (ConstantUtf8)constants[n.getNameIndex()];
+        String method_name = u8.getBytes();
+
+        u8 = (ConstantUtf8)constants[n.getSignatureIndex()];
+        String signature = u8.getBytes();
+
+        String delim = METHODREF_DELIM;
+
+        if(c instanceof ConstantInterfaceMethodref)
+          delim = IMETHODREF_DELIM;
+        else if(c instanceof ConstantFieldref)
+          delim = FIELDREF_DELIM;
+
+        cp_table.put(class_name + delim + method_name + delim + signature, new Index(i));
+      }
+    }
+  }
+
+  /**
+   * Initialize with given constant pool.
+   */
+  public ConstantPoolGen(ConstantPool cp) {
+    this(cp.getConstantPool());
+  }
+
+  /**
+   * Create empty constant pool.
+   */
+  public ConstantPoolGen() {}
+
+  /** Resize internal array of constants.
+   */
+  protected void adjustSize() {
+    if(index + 3 >= size) {
+      Constant[] cs = constants;
+
+      size      *= 2;
+      constants  = new Constant[size];
+      System.arraycopy(cs, 0, constants, 0, index);
+    }
+  }
+
+  private HashMap string_table = new HashMap();
+
+  /**
+   * Look for ConstantString in ConstantPool containing String `str'.
+   *
+   * @param str String to search for
+   * @return index on success, -1 otherwise
+   */
+  public int lookupString(String str) {
+    Index index = (Index)string_table.get(str);
+    return (index != null)? index.index : -1;
+  }
+
+  /**
+   * Add a new String constant to the ConstantPool, if it is not already in there.
+   *
+   * @param str String to add
+   * @return index of entry
+   */
+  public int addString(String str) {
+    int ret;
+
+    if((ret = lookupString(str)) != -1)
+      return ret; // Already in CP
+
+    int utf8 = addUtf8(str);
+
+    adjustSize();
+
+    ConstantString s  = new ConstantString(utf8);
+
+    ret = index;
+    constants[index++] = s;
+
+    string_table.put(str, new Index(ret));
+
+    return ret;
+  }
+
+  private HashMap class_table = new HashMap();
+
+  /**
+   * Look for ConstantClass in ConstantPool named `str'.
+   *
+   * @param str String to search for
+   * @return index on success, -1 otherwise
+   */
+  public int lookupClass(String str) {
+    Index index = (Index)class_table.get(str.replace('.', '/'));
+    return (index != null)? index.index : -1;
+  }
+
+  private int addClass_(String clazz) {
+    int    ret;
+
+    if((ret = lookupClass(clazz)) != -1)
+      return ret; // Already in CP
+
+    adjustSize();
+
+    ConstantClass c = new ConstantClass(addUtf8(clazz));
+
+    ret = index;
+    constants[index++] = c;
+
+    class_table.put(clazz, new Index(ret));
+
+    return ret;
+  }
+
+  /**
+   * Add a new Class reference to the ConstantPool, if it is not already in there.
+   *
+   * @param str Class to add
+   * @return index of entry
+   */
+  public int addClass(String str) {
+    return addClass_(str.replace('.', '/'));
+  }
+
+  /**
+   * Add a new Class reference to the ConstantPool for a given type.
+   *
+   * @param str Class to add
+   * @return index of entry
+   */
+  public int addClass(ObjectType type) {
+    return addClass(type.getClassName());
+  }
+
+  /**
+   * Add a reference to an array class (e.g. String[][]) as needed by MULTIANEWARRAY
+   * instruction, e.g. to the ConstantPool.
+   *
+   * @param type type of array class
+   * @return index of entry
+   */
+  public int addArrayClass(ArrayType type) {
+    return addClass_(type.getSignature());
+  }
+
+  /**
+   * Look for ConstantInteger in ConstantPool.
+   *
+   * @param n integer number to look for
+   * @return index on success, -1 otherwise
+   */
+  public int lookupInteger(int n) {
+    for(int i=1; i < index; i++) {
+      if(constants[i] instanceof ConstantInteger) {
+        ConstantInteger c = (ConstantInteger)constants[i];
+
+        if(c.getBytes() == n)
+          return i;
+      }
+    }
+
+    return -1;
+  }
+
+  /**
+   * Add a new Integer constant to the ConstantPool, if it is not already in there.
+   *
+   * @param n integer number to add
+   * @return index of entry
+   */
+  public int addInteger(int n) {
+    int  ret;
+
+    if((ret = lookupInteger(n)) != -1)
+      return ret; // Already in CP
+
+    adjustSize();
+
+    ret = index;
+    constants[index++] = new ConstantInteger(n);
+
+    return ret;
+  }
+
+  /**
+   * Look for ConstantFloat in ConstantPool.
+   *
+   * @param n Float number to look for
+   * @return index on success, -1 otherwise
+   */
+  public int lookupFloat(float n) {
+    int bits = Float.floatToIntBits(n);
+
+    for(int i=1; i < index; i++) {
+      if(constants[i] instanceof ConstantFloat) {
+        ConstantFloat c = (ConstantFloat)constants[i];
+
+        if(Float.floatToIntBits(c.getBytes()) == bits)
+          return i;
+      }
+    }
+
+    return -1;
+  }
+
+  /**
+   * Add a new Float constant to the ConstantPool, if it is not already in there.
+   *
+   * @param n Float number to add
+   * @return index of entry
+   */
+  public int addFloat(float n) {
+    int  ret;
+
+    if((ret = lookupFloat(n)) != -1)
+      return ret; // Already in CP
+
+    adjustSize();
+
+    ret = index;
+    constants[index++] = new ConstantFloat(n);
+
+    return ret;
+  }
+
+  private HashMap utf8_table = new HashMap();
+
+  /**
+   * Look for ConstantUtf8 in ConstantPool.
+   *
+   * @param n Utf8 string to look for
+   * @return index on success, -1 otherwise
+   */
+  public int lookupUtf8(String n) {
+    Index index = (Index)utf8_table.get(n);
+
+    return (index != null)? index.index : -1;
+  }
+
+  /**
+   * Add a new Utf8 constant to the ConstantPool, if it is not already in there.
+   *
+   * @param n Utf8 string to add
+   * @return index of entry
+   */
+  public int addUtf8(String n) {
+    int  ret;
+
+    if((ret = lookupUtf8(n)) != -1)
+      return ret; // Already in CP
+
+    adjustSize();
+
+    ret = index;
+    constants[index++] = new ConstantUtf8(n);
+
+    utf8_table.put(n, new Index(ret));
+
+    return ret;
+  }
+
+  /**
+   * Look for ConstantLong in ConstantPool.
+   *
+   * @param n Long number to look for
+   * @return index on success, -1 otherwise
+   */
+  public int lookupLong(long n) {
+    for(int i=1; i < index; i++) {
+      if(constants[i] instanceof ConstantLong) {
+        ConstantLong c = (ConstantLong)constants[i];
+
+        if(c.getBytes() == n)
+          return i;
+      }
+    }
+
+    return -1;
+  }
+
+  /**
+   * Add a new long constant to the ConstantPool, if it is not already in there.
+   *
+   * @param n Long number to add
+   * @return index of entry
+   */
+  public int addLong(long n) {
+    int  ret;
+
+    if((ret = lookupLong(n)) != -1)
+      return ret; // Already in CP
+
+    adjustSize();
+
+    ret = index;
+    constants[index] = new ConstantLong(n);
+    index += 2;   // Wastes one entry according to spec
+
+    return ret;
+  }
+
+  /**
+   * Look for ConstantDouble in ConstantPool.
+   *
+   * @param n Double number to look for
+   * @return index on success, -1 otherwise
+   */
+  public int lookupDouble(double n) {
+    long bits = Double.doubleToLongBits(n);
+
+    for(int i=1; i < index; i++) {
+      if(constants[i] instanceof ConstantDouble) {
+        ConstantDouble c = (ConstantDouble)constants[i];
+
+        if(Double.doubleToLongBits(c.getBytes()) == bits)
+          return i;
+      }
+    }
+
+    return -1;
+  }
+
+  /**
+   * Add a new double constant to the ConstantPool, if it is not already in there.
+   *
+   * @param n Double number to add
+   * @return index of entry
+   */
+  public int addDouble(double n) {
+    int  ret;
+
+    if((ret = lookupDouble(n)) != -1)
+      return ret; // Already in CP
+
+    adjustSize();
+
+    ret = index;
+    constants[index] = new ConstantDouble(n);
+    index += 2;   // Wastes one entry according to spec
+
+    return ret;
+  }
+
+  private HashMap n_a_t_table = new HashMap();
+
+  /**
+   * Look for ConstantNameAndType in ConstantPool.
+   *
+   * @param name of variable/method
+   * @param signature of variable/method
+   * @return index on success, -1 otherwise
+   */
+  public int lookupNameAndType(String name, String signature) {
+    Index index = (Index)n_a_t_table.get(name + NAT_DELIM + signature);
+    return (index != null)? index.index : -1;
+  }
+
+  /**
+   * Add a new NameAndType constant to the ConstantPool if it is not already
+   * in there.
+   *
+   * @param n NameAndType string to add
+   * @return index of entry
+   */
+  public int addNameAndType(String name, String signature) {
+    int  ret;
+    int  name_index, signature_index;
+
+    if((ret = lookupNameAndType(name, signature)) != -1)
+      return ret; // Already in CP
+
+    adjustSize();
+
+    name_index      = addUtf8(name);
+    signature_index = addUtf8(signature);
+    ret = index;
+    constants[index++] = new ConstantNameAndType(name_index, signature_index);
+
+    n_a_t_table.put(name + NAT_DELIM + signature, new Index(ret));
+    return ret;
+  }
+
+  private HashMap cp_table = new HashMap();
+
+  /**
+   * Look for ConstantMethodref in ConstantPool.
+   *
+   * @param class_name Where to find method
+   * @param method_name Guess what
+   * @param signature return and argument types
+   * @return index on success, -1 otherwise
+   */
+  public int lookupMethodref(String class_name, String method_name, String signature) {
+    Index index = (Index)cp_table.get(class_name + METHODREF_DELIM + method_name +
+                                      METHODREF_DELIM + signature);
+    return (index != null)? index.index : -1;
+  }
+
+  public int lookupMethodref(MethodGen method) {
+    return lookupMethodref(method.getClassName(), method.getName(),
+                          method.getSignature());
+  }
+
+  /**
+   * Add a new Methodref constant to the ConstantPool, if it is not already
+   * in there.
+   *
+   * @param n Methodref string to add
+   * @return index of entry
+   */
+  public int addMethodref(String class_name, String method_name, String signature) {
+    int  ret, class_index, name_and_type_index;
+
+    if((ret = lookupMethodref(class_name, method_name, signature)) != -1)
+      return ret; // Already in CP
+
+    adjustSize();
+
+    name_and_type_index = addNameAndType(method_name, signature);
+    class_index         = addClass(class_name);
+    ret = index;
+    constants[index++] = new ConstantMethodref(class_index, name_and_type_index);
+
+    cp_table.put(class_name + METHODREF_DELIM + method_name +
+                 METHODREF_DELIM + signature, new Index(ret));
+
+    return ret;
+  }
+
+  public int addMethodref(MethodGen method) {
+    return addMethodref(method.getClassName(), method.getName(),
+                        method.getSignature());
+  }
+
+  /**
+   * Look for ConstantInterfaceMethodref in ConstantPool.
+   *
+   * @param class_name Where to find method
+   * @param method_name Guess what
+   * @param signature return and argument types
+   * @return index on success, -1 otherwise
+   */
+  public int lookupInterfaceMethodref(String class_name, String method_name, String signature) {
+    Index index = (Index)cp_table.get(class_name + IMETHODREF_DELIM + method_name +
+                                      IMETHODREF_DELIM + signature);
+    return (index != null)? index.index : -1;
+  }
+
+  public int lookupInterfaceMethodref(MethodGen method) {
+    return lookupInterfaceMethodref(method.getClassName(), method.getName(),
+                                    method.getSignature());
+  }
+
+  /**
+   * Add a new InterfaceMethodref constant to the ConstantPool, if it is not already
+   * in there.
+   *
+   * @param n InterfaceMethodref string to add
+   * @return index of entry
+   */
+  public int addInterfaceMethodref(String class_name, String method_name, String signature) {
+    int ret, class_index, name_and_type_index;
+
+    if((ret = lookupInterfaceMethodref(class_name, method_name, signature)) != -1)
+      return ret; // Already in CP
+
+    adjustSize();
+
+    class_index         = addClass(class_name);
+    name_and_type_index = addNameAndType(method_name, signature);
+    ret = index;
+    constants[index++] = new ConstantInterfaceMethodref(class_index, name_and_type_index);
+
+    cp_table.put(class_name + IMETHODREF_DELIM + method_name +
+                 IMETHODREF_DELIM + signature, new Index(ret));
+
+    return ret;
+  }
+
+  public int addInterfaceMethodref(MethodGen method) {
+    return addInterfaceMethodref(method.getClassName(), method.getName(),
+                                 method.getSignature());
+  }
+
+  /**
+   * Look for ConstantFieldref in ConstantPool.
+   *
+   * @param class_name Where to find method
+   * @param field_name Guess what
+   * @param signature return and argument types
+   * @return index on success, -1 otherwise
+   */
+  public int lookupFieldref(String class_name, String field_name, String signature) {
+    Index index = (Index)cp_table.get(class_name + FIELDREF_DELIM + field_name +
+                                      FIELDREF_DELIM + signature);
+    return (index != null)? index.index : -1;
+  }
+
+  /**
+   * Add a new Fieldref constant to the ConstantPool, if it is not already
+   * in there.
+   *
+   * @param n Fieldref string to add
+   * @return index of entry
+   */
+  public int addFieldref(String class_name, String field_name, String signature) {
+    int  ret;
+    int  class_index, name_and_type_index;
+
+    if((ret = lookupFieldref(class_name, field_name, signature)) != -1)
+      return ret; // Already in CP
+
+    adjustSize();
+
+    class_index         = addClass(class_name);
+    name_and_type_index = addNameAndType(field_name, signature);
+    ret = index;
+    constants[index++] = new ConstantFieldref(class_index, name_and_type_index);
+
+    cp_table.put(class_name + FIELDREF_DELIM + field_name + FIELDREF_DELIM + signature, new Index(ret));
+
+    return ret;
+  }
+
+  /**
+   * @param i index in constant pool
+   * @return constant pool entry at index i
+   */
+  public Constant getConstant(int i) { return constants[i]; }
+
+  /**
+   * Use with care!
+   *
+   * @param i index in constant pool
+   * @param c new constant pool entry at index i
+   */
+  public void setConstant(int i, Constant c) { constants[i] = c; }
+
+  /**
+   * @return intermediate constant pool
+   */
+  public ConstantPool getConstantPool() {
+    return new ConstantPool(constants);
+  }
+
+  /**
+   * @return current size of constant pool
+   */
+  public int getSize() {
+    return index;
+  }
+
+  /**
+   * @return constant pool with proper length
+   */
+  public ConstantPool getFinalConstantPool() {
+    Constant[] cs = new Constant[index];
+
+    System.arraycopy(constants, 0, cs, 0, index);
+
+    return new ConstantPool(cs);
+  }
+
+  /**
+   * @return String representation.
+   */
+  public String toString() {
+    StringBuffer buf = new StringBuffer();
+
+    for(int i=1; i < index; i++)
+      buf.append(i + ")" + constants[i] + "\n");
+
+    return buf.toString();
+  }
+
+  /** Import constant from another ConstantPool and return new index.
+   */
+  public int addConstant(Constant c, ConstantPoolGen cp) {
+    Constant[] constants = cp.getConstantPool().getConstantPool();
+
+    switch(c.getTag()) {
+    case Constants.CONSTANT_String: {
+      ConstantString s  = (ConstantString)c;
+      ConstantUtf8   u8 = (ConstantUtf8)constants[s.getStringIndex()];
+
+      return addString(u8.getBytes());
+    }
+
+    case Constants.CONSTANT_Class: {
+      ConstantClass s  = (ConstantClass)c;
+      ConstantUtf8  u8 = (ConstantUtf8)constants[s.getNameIndex()];
+
+      return addClass(u8.getBytes());
+    }
+
+    case Constants.CONSTANT_NameAndType: {
+      ConstantNameAndType n    = (ConstantNameAndType)c;
+      ConstantUtf8        u8   = (ConstantUtf8)constants[n.getNameIndex()];
+      ConstantUtf8        u8_2 = (ConstantUtf8)constants[n.getSignatureIndex()];
+
+      return addNameAndType(u8.getBytes(), u8_2.getBytes());
+    }
+
+    case Constants.CONSTANT_Utf8:
+      return addUtf8(((ConstantUtf8)c).getBytes());
+
+    case Constants.CONSTANT_Double:
+      return addDouble(((ConstantDouble)c).getBytes());
+
+    case Constants.CONSTANT_Float:
+      return addFloat(((ConstantFloat)c).getBytes());
+
+    case Constants.CONSTANT_Long:
+      return addLong(((ConstantLong)c).getBytes());
+
+    case Constants.CONSTANT_Integer:
+      return addInteger(((ConstantInteger)c).getBytes());
+
+    case Constants.CONSTANT_InterfaceMethodref: case Constants.CONSTANT_Methodref:
+    case Constants.CONSTANT_Fieldref: {
+      ConstantCP          m     = (ConstantCP)c;
+      ConstantClass       clazz = (ConstantClass)constants[m.getClassIndex()];
+      ConstantNameAndType n     = (ConstantNameAndType)constants[m.getNameAndTypeIndex()];
+      ConstantUtf8 u8           = (ConstantUtf8)constants[clazz.getNameIndex()];
+      String       class_name   = u8.getBytes().replace('/', '.');
+
+      u8 = (ConstantUtf8)constants[n.getNameIndex()];
+      String name = u8.getBytes();
+
+      u8 = (ConstantUtf8)constants[n.getSignatureIndex()];
+      String signature = u8.getBytes();
+
+      switch(c.getTag()) {
+      case Constants.CONSTANT_InterfaceMethodref:
+        return addInterfaceMethodref(class_name, name, signature);
+
+      case Constants.CONSTANT_Methodref:
+        return addMethodref(class_name, name, signature);
+
+      case Constants.CONSTANT_Fieldref:
+        return addFieldref(class_name, name, signature);
+
+      default: // Never reached
+        throw new RuntimeException("Unknown constant type " + c);
+      }
+    }
+
+    default: // Never reached
+      throw new RuntimeException("Unknown constant type " + c);
+    }
+  }
+}