langtools/src/jdk.jdeps/share/classes/com/sun/tools/javap/ConstantWriter.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2007, 2014, 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 com.sun.tools.javap;

 import com.sun.tools.classfile.ClassFile;
 import com.sun.tools.classfile.ConstantPool;
 import com.sun.tools.classfile.ConstantPoolException;

 import static com.sun.tools.classfile.ConstantPool.*;

 /*
  *  Write a constant pool entry.
  *
  *  <p><b>This is NOT part of any supported API.
  *  If you write code that depends on this, you do so at your own risk.
  *  This code and its internal interfaces are subject to change or
  *  deletion without notice.</b>
  */
 public class ConstantWriter extends BasicWriter {
     public static ConstantWriter instance(Context context) {
         ConstantWriter instance = context.get(ConstantWriter.class);
         if (instance == null)
             instance = new ConstantWriter(context);
         return instance;
     }

     protected ConstantWriter(Context context) {
         super(context);
         context.put(ConstantWriter.class, this);
         classWriter = ClassWriter.instance(context);
         options = Options.instance(context);
     }

     protected void writeConstantPool() {
         ConstantPool constant_pool = classWriter.getClassFile().constant_pool;
         writeConstantPool(constant_pool);
     }

     protected void writeConstantPool(ConstantPool constant_pool) {
         ConstantPool.Visitor<Integer, Void> v = new ConstantPool.Visitor<Integer,Void>() {
             public Integer visitClass(CONSTANT_Class_info info, Void p) {
                 print("#" + info.name_index);
                 tab();
                 println("// " + stringValue(info));
                 return 1;
             }

             public Integer visitDouble(CONSTANT_Double_info info, Void p) {
                 println(stringValue(info));
                 return 2;
             }

             public Integer visitFieldref(CONSTANT_Fieldref_info info, Void p) {
                 print("#" + info.class_index + ".#" + info.name_and_type_index);
                 tab();
                 println("// " + stringValue(info));
                 return 1;
             }

             public Integer visitFloat(CONSTANT_Float_info info, Void p) {
                 println(stringValue(info));
                 return 1;
             }

             public Integer visitInteger(CONSTANT_Integer_info info, Void p) {
                 println(stringValue(info));
                 return 1;
             }

             public Integer visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Void p) {
                 print("#" + info.class_index + ".#" + info.name_and_type_index);
                 tab();
                 println("// " + stringValue(info));
                 return 1;
             }

             public Integer visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, Void p) {
                 print("#" + info.bootstrap_method_attr_index + ":#" + info.name_and_type_index);
                 tab();
                 println("// " + stringValue(info));
                 return 1;
             }

             public Integer visitLong(CONSTANT_Long_info info, Void p) {
                 println(stringValue(info));
                 return 2;
             }

             public Integer visitNameAndType(CONSTANT_NameAndType_info info, Void p) {
                 print("#" + info.name_index + ":#" + info.type_index);
                 tab();
                 println("// " + stringValue(info));
                 return 1;
             }

             public Integer visitMethodref(CONSTANT_Methodref_info info, Void p) {
                 print("#" + info.class_index + ".#" + info.name_and_type_index);
                 tab();
                 println("// " + stringValue(info));
                 return 1;
             }

             public Integer visitMethodHandle(CONSTANT_MethodHandle_info info, Void p) {
                 print("#" + info.reference_kind.tag + ":#" + info.reference_index);
                 tab();
                 println("// " + stringValue(info));
                 return 1;
             }

             public Integer visitMethodType(CONSTANT_MethodType_info info, Void p) {
                 print("#" + info.descriptor_index);
                 tab();
                 println("//  " + stringValue(info));
                 return 1;
             }

             public Integer visitString(CONSTANT_String_info info, Void p) {
                 print("#" + info.string_index);
                 tab();
                 println("// " + stringValue(info));
                 return 1;
             }

             public Integer visitUtf8(CONSTANT_Utf8_info info, Void p) {
                 println(stringValue(info));
                 return 1;
             }

         };
         println("Constant pool:");
         indent(+1);
         int width = String.valueOf(constant_pool.size()).length() + 1;
         int cpx = 1;
         while (cpx < constant_pool.size()) {
             print(String.format("%" + width + "s", ("#" + cpx)));
             try {
                 CPInfo cpInfo = constant_pool.get(cpx);
                 print(String.format(" = %-18s ", cpTagName(cpInfo)));
                 cpx += cpInfo.accept(v, null);
             } catch (ConstantPool.InvalidIndex ex) {
                 // should not happen
             }
         }
         indent(-1);
     }

     protected void write(int cpx) {
         ClassFile classFile = classWriter.getClassFile();
         if (cpx == 0) {
             print("#0");
             return;
         }

         CPInfo cpInfo;
         try {
             cpInfo = classFile.constant_pool.get(cpx);
         } catch (ConstantPoolException e) {
             print("#" + cpx);
             return;
         }

         int tag = cpInfo.getTag();
         switch (tag) {
             case CONSTANT_Methodref:
             case CONSTANT_InterfaceMethodref:
             case CONSTANT_Fieldref:
                 // simplify references within this class
                 CPRefInfo ref = (CPRefInfo) cpInfo;
                 try {
                     if (ref.class_index == classFile.this_class)
                          cpInfo = classFile.constant_pool.get(ref.name_and_type_index);
                 } catch (ConstantPool.InvalidIndex e) {
                     // ignore, for now
                 }
         }
         print(tagName(tag) + " " + stringValue(cpInfo));
     }

     String cpTagName(CPInfo cpInfo) {
         String n = cpInfo.getClass().getSimpleName();
         return n.replace("CONSTANT_", "").replace("_info", "");
     }

     String tagName(int tag) {
         switch (tag) {
             case CONSTANT_Utf8:
                 return "Utf8";
             case CONSTANT_Integer:
                 return "int";
             case CONSTANT_Float:
                 return "float";
             case CONSTANT_Long:
                 return "long";
             case CONSTANT_Double:
                 return "double";
             case CONSTANT_Class:
                 return "class";
             case CONSTANT_String:
                 return "String";
             case CONSTANT_Fieldref:
                 return "Field";
             case CONSTANT_MethodHandle:
                 return "MethodHandle";
             case CONSTANT_MethodType:
                 return "MethodType";
             case CONSTANT_Methodref:
                 return "Method";
             case CONSTANT_InterfaceMethodref:
                 return "InterfaceMethod";
             case CONSTANT_InvokeDynamic:
                 return "InvokeDynamic";
             case CONSTANT_NameAndType:
                 return "NameAndType";
             default:
                 return "(unknown tag " + tag + ")";
         }
     }

     String stringValue(int constant_pool_index) {
         ClassFile classFile = classWriter.getClassFile();
         try {
             return stringValue(classFile.constant_pool.get(constant_pool_index));
         } catch (ConstantPool.InvalidIndex e) {
             return report(e);
         }
     }

     String stringValue(CPInfo cpInfo) {
         return stringValueVisitor.visit(cpInfo);
     }

     StringValueVisitor stringValueVisitor = new StringValueVisitor();

     private class StringValueVisitor implements ConstantPool.Visitor<String, Void> {
         public String visit(CPInfo info) {
             return info.accept(this, null);
         }

         public String visitClass(CONSTANT_Class_info info, Void p) {
             return getCheckedName(info);
         }

         String getCheckedName(CONSTANT_Class_info info) {
             try {
                 return checkName(info.getName());
             } catch (ConstantPoolException e) {
                 return report(e);
             }
         }

         public String visitDouble(CONSTANT_Double_info info, Void p) {
             return info.value + "d";
         }

         public String visitFieldref(CONSTANT_Fieldref_info info, Void p) {
             return visitRef(info, p);
         }

         public String visitFloat(CONSTANT_Float_info info, Void p) {
             return info.value + "f";
         }

         public String visitInteger(CONSTANT_Integer_info info, Void p) {
             return String.valueOf(info.value);
         }

         public String visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Void p) {
             return visitRef(info, p);
         }

         public String visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, Void p) {
             try {
                 String callee = stringValue(info.getNameAndTypeInfo());
                 return "#" + info.bootstrap_method_attr_index + ":" + callee;
             } catch (ConstantPoolException e) {
                 return report(e);
             }
         }

         public String visitLong(CONSTANT_Long_info info, Void p) {
             return info.value + "l";
         }

         public String visitNameAndType(CONSTANT_NameAndType_info info, Void p) {
             return getCheckedName(info) + ":" + getType(info);
         }

         String getCheckedName(CONSTANT_NameAndType_info info) {
             try {
                 return checkName(info.getName());
             } catch (ConstantPoolException e) {
                 return report(e);
             }
         }

         String getType(CONSTANT_NameAndType_info info) {
             try {
                 return info.getType();
             } catch (ConstantPoolException e) {
                 return report(e);
             }
         }

         public String visitMethodHandle(CONSTANT_MethodHandle_info info, Void p) {
             try {
                 return info.reference_kind.name + " " + stringValue(info.getCPRefInfo());
             } catch (ConstantPoolException e) {
                 return report(e);
             }
         }

         public String visitMethodType(CONSTANT_MethodType_info info, Void p) {
             try {
                 return info.getType();
             } catch (ConstantPoolException e) {
                 return report(e);
             }
         }

         public String visitMethodref(CONSTANT_Methodref_info info, Void p) {
             return visitRef(info, p);
         }

         public String visitString(CONSTANT_String_info info, Void p) {
             try {
                 ClassFile classFile = classWriter.getClassFile();
                 int string_index = info.string_index;
                 return stringValue(classFile.constant_pool.getUTF8Info(string_index));
             } catch (ConstantPoolException e) {
                 return report(e);
             }
         }

         public String visitUtf8(CONSTANT_Utf8_info info, Void p) {
             String s = info.value;
             StringBuilder sb = new StringBuilder();
             for (int i = 0; i < s.length(); i++) {
                 char c = s.charAt(i);
                 switch (c) {
                     case '\t':
                         sb.append('\\').append('t');
                         break;
                     case '\n':
                         sb.append('\\').append('n');
                         break;
                     case '\r':
                         sb.append('\\').append('r');
                         break;
                     case '\b':
                         sb.append('\\').append('b');
                         break;
                     case '\f':
                         sb.append('\\').append('f');
                         break;
                     case '\"':
                         sb.append('\\').append('\"');
                         break;
                     case '\'':
                         sb.append('\\').append('\'');
                         break;
                     case '\\':
                         sb.append('\\').append('\\');
                         break;
                     default:
                         sb.append(c);
                 }
             }
             return sb.toString();
         }

         String visitRef(CPRefInfo info, Void p) {
             String cn = getCheckedClassName(info);
             String nat;
             try {
                 nat = stringValue(info.getNameAndTypeInfo());
             } catch (ConstantPoolException e) {
                 nat = report(e);
             }
             return cn + "." + nat;
         }

         String getCheckedClassName(CPRefInfo info) {
             try {
                 return checkName(info.getClassName());
             } catch (ConstantPoolException e) {
                 return report(e);
             }
         }
     }

     /* If name is a valid binary name, return it; otherwise quote it. */
     private static String checkName(String name) {
         if (name == null)
             return "null";

         int len = name.length();
         if (len == 0)
             return "\"\"";

         int cc = '/';
         int cp;
         for (int k = 0; k < len; k += Character.charCount(cp)) {
             cp = name.codePointAt(k);
             if ((cc == '/' && !Character.isJavaIdentifierStart(cp))
                     || (cp != '/' && !Character.isJavaIdentifierPart(cp))) {
                 return "\"" + addEscapes(name) + "\"";
             }
             cc = cp;
         }

         return name;
     }

     /* If name requires escapes, put them in, so it can be a string body. */
     private static String addEscapes(String name) {
         String esc = "\\\"\n\t";
         String rep = "\\\"nt";
         StringBuilder buf = null;
         int nextk = 0;
         int len = name.length();
         for (int k = 0; k < len; k++) {
             char cp = name.charAt(k);
             int n = esc.indexOf(cp);
             if (n >= 0) {
                 if (buf == null)
                     buf = new StringBuilder(len * 2);
                 if (nextk < k)
                     buf.append(name, nextk, k);
                 buf.append('\\');
                 buf.append(rep.charAt(n));
                 nextk = k+1;
             }
         }
         if (buf == null)
             return name;
         if (nextk < len)
             buf.append(name, nextk, len);
         return buf.toString();
     }

     private ClassWriter classWriter;
     private Options options;
 }
	/*
	* Copyright (c) 2007, 2014, 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 com.sun.tools.javap;

	import com.sun.tools.classfile.ClassFile;
	import com.sun.tools.classfile.ConstantPool;
	import com.sun.tools.classfile.ConstantPoolException;

	import static com.sun.tools.classfile.ConstantPool.*;

	/*
	* Write a constant pool entry.
	*
	* <p><b>This is NOT part of any supported API.
	* If you write code that depends on this, you do so at your own risk.
	* This code and its internal interfaces are subject to change or
	* deletion without notice.</b>
	*/
	public class ConstantWriter extends BasicWriter {
	public static ConstantWriter instance(Context context) {
	ConstantWriter instance = context.get(ConstantWriter.class);
	if (instance == null)
	instance = new ConstantWriter(context);
	return instance;
	}

	protected ConstantWriter(Context context) {
	super(context);
	context.put(ConstantWriter.class, this);
	classWriter = ClassWriter.instance(context);
	options = Options.instance(context);
	}

	protected void writeConstantPool() {
	ConstantPool constant_pool = classWriter.getClassFile().constant_pool;
	writeConstantPool(constant_pool);
	}

	protected void writeConstantPool(ConstantPool constant_pool) {
	ConstantPool.Visitor<Integer, Void> v = new ConstantPool.Visitor<Integer,Void>() {
	public Integer visitClass(CONSTANT_Class_info info, Void p) {
	print("#" + info.name_index);
	tab();
	println("// " + stringValue(info));
	return 1;
	}

	public Integer visitDouble(CONSTANT_Double_info info, Void p) {
	println(stringValue(info));
	return 2;
	}

	public Integer visitFieldref(CONSTANT_Fieldref_info info, Void p) {
	print("#" + info.class_index + ".#" + info.name_and_type_index);
	tab();
	println("// " + stringValue(info));
	return 1;
	}

	public Integer visitFloat(CONSTANT_Float_info info, Void p) {
	println(stringValue(info));
	return 1;
	}

	public Integer visitInteger(CONSTANT_Integer_info info, Void p) {
	println(stringValue(info));
	return 1;
	}

	public Integer visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Void p) {
	print("#" + info.class_index + ".#" + info.name_and_type_index);
	tab();
	println("// " + stringValue(info));
	return 1;
	}

	public Integer visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, Void p) {
	print("#" + info.bootstrap_method_attr_index + ":#" + info.name_and_type_index);
	tab();
	println("// " + stringValue(info));
	return 1;
	}

	public Integer visitLong(CONSTANT_Long_info info, Void p) {
	println(stringValue(info));
	return 2;
	}

	public Integer visitNameAndType(CONSTANT_NameAndType_info info, Void p) {
	print("#" + info.name_index + ":#" + info.type_index);
	tab();
	println("// " + stringValue(info));
	return 1;
	}

	public Integer visitMethodref(CONSTANT_Methodref_info info, Void p) {
	print("#" + info.class_index + ".#" + info.name_and_type_index);
	tab();
	println("// " + stringValue(info));
	return 1;
	}

	public Integer visitMethodHandle(CONSTANT_MethodHandle_info info, Void p) {
	print("#" + info.reference_kind.tag + ":#" + info.reference_index);
	tab();
	println("// " + stringValue(info));
	return 1;
	}

	public Integer visitMethodType(CONSTANT_MethodType_info info, Void p) {
	print("#" + info.descriptor_index);
	tab();
	println("// " + stringValue(info));
	return 1;
	}

	public Integer visitString(CONSTANT_String_info info, Void p) {
	print("#" + info.string_index);
	tab();
	println("// " + stringValue(info));
	return 1;
	}

	public Integer visitUtf8(CONSTANT_Utf8_info info, Void p) {
	println(stringValue(info));
	return 1;
	}

	};
	println("Constant pool:");
	indent(+1);
	int width = String.valueOf(constant_pool.size()).length() + 1;
	int cpx = 1;
	while (cpx < constant_pool.size()) {
	print(String.format("%" + width + "s", ("#" + cpx)));
	try {
	CPInfo cpInfo = constant_pool.get(cpx);
	print(String.format(" = %-18s ", cpTagName(cpInfo)));
	cpx += cpInfo.accept(v, null);
	} catch (ConstantPool.InvalidIndex ex) {
	// should not happen
	}
	}
	indent(-1);
	}

	protected void write(int cpx) {
	ClassFile classFile = classWriter.getClassFile();
	if (cpx == 0) {
	print("#0");
	return;
	}

	CPInfo cpInfo;
	try {
	cpInfo = classFile.constant_pool.get(cpx);
	} catch (ConstantPoolException e) {
	print("#" + cpx);
	return;
	}

	int tag = cpInfo.getTag();
	switch (tag) {
	case CONSTANT_Methodref:
	case CONSTANT_InterfaceMethodref:
	case CONSTANT_Fieldref:
	// simplify references within this class
	CPRefInfo ref = (CPRefInfo) cpInfo;
	try {
	if (ref.class_index == classFile.this_class)
	cpInfo = classFile.constant_pool.get(ref.name_and_type_index);
	} catch (ConstantPool.InvalidIndex e) {
	// ignore, for now
	}
	}
	print(tagName(tag) + " " + stringValue(cpInfo));
	}

	String cpTagName(CPInfo cpInfo) {
	String n = cpInfo.getClass().getSimpleName();
	return n.replace("CONSTANT_", "").replace("_info", "");
	}

	String tagName(int tag) {
	switch (tag) {
	case CONSTANT_Utf8:
	return "Utf8";
	case CONSTANT_Integer:
	return "int";
	case CONSTANT_Float:
	return "float";
	case CONSTANT_Long:
	return "long";
	case CONSTANT_Double:
	return "double";
	case CONSTANT_Class:
	return "class";
	case CONSTANT_String:
	return "String";
	case CONSTANT_Fieldref:
	return "Field";
	case CONSTANT_MethodHandle:
	return "MethodHandle";
	case CONSTANT_MethodType:
	return "MethodType";
	case CONSTANT_Methodref:
	return "Method";
	case CONSTANT_InterfaceMethodref:
	return "InterfaceMethod";
	case CONSTANT_InvokeDynamic:
	return "InvokeDynamic";
	case CONSTANT_NameAndType:
	return "NameAndType";
	default:
	return "(unknown tag " + tag + ")";
	}
	}

	String stringValue(int constant_pool_index) {
	ClassFile classFile = classWriter.getClassFile();
	try {
	return stringValue(classFile.constant_pool.get(constant_pool_index));
	} catch (ConstantPool.InvalidIndex e) {
	return report(e);
	}
	}

	String stringValue(CPInfo cpInfo) {
	return stringValueVisitor.visit(cpInfo);
	}

	StringValueVisitor stringValueVisitor = new StringValueVisitor();

	private class StringValueVisitor implements ConstantPool.Visitor<String, Void> {
	public String visit(CPInfo info) {
	return info.accept(this, null);
	}

	public String visitClass(CONSTANT_Class_info info, Void p) {
	return getCheckedName(info);
	}

	String getCheckedName(CONSTANT_Class_info info) {
	try {
	return checkName(info.getName());
	} catch (ConstantPoolException e) {
	return report(e);
	}
	}

	public String visitDouble(CONSTANT_Double_info info, Void p) {
	return info.value + "d";
	}

	public String visitFieldref(CONSTANT_Fieldref_info info, Void p) {
	return visitRef(info, p);
	}

	public String visitFloat(CONSTANT_Float_info info, Void p) {
	return info.value + "f";
	}

	public String visitInteger(CONSTANT_Integer_info info, Void p) {
	return String.valueOf(info.value);
	}

	public String visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Void p) {
	return visitRef(info, p);
	}

	public String visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, Void p) {
	try {
	String callee = stringValue(info.getNameAndTypeInfo());
	return "#" + info.bootstrap_method_attr_index + ":" + callee;
	} catch (ConstantPoolException e) {
	return report(e);
	}
	}

	public String visitLong(CONSTANT_Long_info info, Void p) {
	return info.value + "l";
	}

	public String visitNameAndType(CONSTANT_NameAndType_info info, Void p) {
	return getCheckedName(info) + ":" + getType(info);
	}

	String getCheckedName(CONSTANT_NameAndType_info info) {
	try {
	return checkName(info.getName());
	} catch (ConstantPoolException e) {
	return report(e);
	}
	}

	String getType(CONSTANT_NameAndType_info info) {
	try {
	return info.getType();
	} catch (ConstantPoolException e) {
	return report(e);
	}
	}

	public String visitMethodHandle(CONSTANT_MethodHandle_info info, Void p) {
	try {
	return info.reference_kind.name + " " + stringValue(info.getCPRefInfo());
	} catch (ConstantPoolException e) {
	return report(e);
	}
	}

	public String visitMethodType(CONSTANT_MethodType_info info, Void p) {
	try {
	return info.getType();
	} catch (ConstantPoolException e) {
	return report(e);
	}
	}

	public String visitMethodref(CONSTANT_Methodref_info info, Void p) {
	return visitRef(info, p);
	}

	public String visitString(CONSTANT_String_info info, Void p) {
	try {
	ClassFile classFile = classWriter.getClassFile();
	int string_index = info.string_index;
	return stringValue(classFile.constant_pool.getUTF8Info(string_index));
	} catch (ConstantPoolException e) {
	return report(e);
	}
	}

	public String visitUtf8(CONSTANT_Utf8_info info, Void p) {
	String s = info.value;
	StringBuilder sb = new StringBuilder();
	for (int i = 0; i < s.length(); i++) {
	char c = s.charAt(i);
	switch (c) {
	case '\t':
	sb.append('\\').append('t');
	break;
	case '\n':
	sb.append('\\').append('n');
	break;
	case '\r':
	sb.append('\\').append('r');
	break;
	case '\b':
	sb.append('\\').append('b');
	break;
	case '\f':
	sb.append('\\').append('f');
	break;
	case '\"':
	sb.append('\\').append('\"');
	break;
	case '\'':
	sb.append('\\').append('\'');
	break;
	case '\\':
	sb.append('\\').append('\\');
	break;
	default:
	sb.append(c);
	}
	}
	return sb.toString();
	}

	String visitRef(CPRefInfo info, Void p) {
	String cn = getCheckedClassName(info);
	String nat;
	try {
	nat = stringValue(info.getNameAndTypeInfo());
	} catch (ConstantPoolException e) {
	nat = report(e);
	}
	return cn + "." + nat;
	}

	String getCheckedClassName(CPRefInfo info) {
	try {
	return checkName(info.getClassName());
	} catch (ConstantPoolException e) {
	return report(e);
	}
	}
	}

	/* If name is a valid binary name, return it; otherwise quote it. */
	private static String checkName(String name) {
	if (name == null)
	return "null";

	int len = name.length();
	if (len == 0)
	return "\"\"";

	int cc = '/';
	int cp;
	for (int k = 0; k < len; k += Character.charCount(cp)) {
	cp = name.codePointAt(k);
	if ((cc == '/' && !Character.isJavaIdentifierStart(cp))
	\|\| (cp != '/' && !Character.isJavaIdentifierPart(cp))) {
	return "\"" + addEscapes(name) + "\"";
	}
	cc = cp;
	}

	return name;
	}

	/* If name requires escapes, put them in, so it can be a string body. */
	private static String addEscapes(String name) {
	String esc = "\\\"\n\t";
	String rep = "\\\"nt";
	StringBuilder buf = null;
	int nextk = 0;
	int len = name.length();
	for (int k = 0; k < len; k++) {
	char cp = name.charAt(k);
	int n = esc.indexOf(cp);
	if (n >= 0) {
	if (buf == null)
	buf = new StringBuilder(len * 2);
	if (nextk < k)
	buf.append(name, nextk, k);
	buf.append('\\');
	buf.append(rep.charAt(n));
	nextk = k+1;
	}
	}
	if (buf == null)
	return name;
	if (nextk < len)
	buf.append(name, nextk, len);
	return buf.toString();
	}

	private ClassWriter classWriter;
	private Options options;
	}