javassist.bytecode.ConstPool Maven / Gradle / Ivy
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2007 Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.bytecode;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.PrintWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javassist.CtClass;
/**
* Constant pool table.
*/
public final class ConstPool {
LongVector items;
int numOfItems;
HashMap classes;
HashMap strings;
ConstInfo[] constInfoCache;
int[] constInfoIndexCache;
int thisClassInfo;
private static final int CACHE_SIZE = 32;
/**
* A hash function for CACHE_SIZE
*/
private static int hashFunc(int a, int b) {
int h = -2128831035;
final int prime = 16777619;
h = (h ^ (a & 0xff)) * prime;
h = (h ^ (b & 0xff)) * prime;
// changing the hash key size from 32bit to 5bit
h = (h >> 5) ^ (h & 0x1f);
return h & 0x1f; // 0..31
}
/**
* CONSTANT_Class
*/
public static final int CONST_Class = ClassInfo.tag;
/**
* CONSTANT_Fieldref
*/
public static final int CONST_Fieldref = FieldrefInfo.tag;
/**
* CONSTANT_Methodref
*/
public static final int CONST_Methodref = MethodrefInfo.tag;
/**
* CONSTANT_InterfaceMethodref
*/
public static final int CONST_InterfaceMethodref
= InterfaceMethodrefInfo.tag;
/**
* CONSTANT_String
*/
public static final int CONST_String = StringInfo.tag;
/**
* CONSTANT_Integer
*/
public static final int CONST_Integer = IntegerInfo.tag;
/**
* CONSTANT_Float
*/
public static final int CONST_Float = FloatInfo.tag;
/**
* CONSTANT_Long
*/
public static final int CONST_Long = LongInfo.tag;
/**
* CONSTANT_Double
*/
public static final int CONST_Double = DoubleInfo.tag;
/**
* CONSTANT_NameAndType
*/
public static final int CONST_NameAndType = NameAndTypeInfo.tag;
/**
* CONSTANT_Utf8
*/
public static final int CONST_Utf8 = Utf8Info.tag;
/**
* Represents the class using this constant pool table.
*/
public static final CtClass THIS = null;
/**
* Constructs a constant pool table.
*
* @param thisclass the name of the class using this constant
* pool table
*/
public ConstPool(String thisclass) {
items = new LongVector();
numOfItems = 0;
addItem(null); // index 0 is reserved by the JVM.
classes = new HashMap();
strings = new HashMap();
constInfoCache = new ConstInfo[CACHE_SIZE];
constInfoIndexCache = new int[CACHE_SIZE];
thisClassInfo = addClassInfo(thisclass);
}
/**
* Constructs a constant pool table from the given byte stream.
*
* @param in byte stream.
*/
public ConstPool(DataInputStream in) throws IOException {
classes = new HashMap();
strings = new HashMap();
constInfoCache = new ConstInfo[CACHE_SIZE];
constInfoIndexCache = new int[CACHE_SIZE];
thisClassInfo = 0;
/* read() initializes items and numOfItems, and do addItem(null).
*/
read(in);
}
void prune() {
classes = new HashMap();
strings = new HashMap();
constInfoCache = new ConstInfo[CACHE_SIZE];
constInfoIndexCache = new int[CACHE_SIZE];
}
/**
* Returns the number of entries in this table.
*/
public int getSize() {
return numOfItems;
}
/**
* Returns the name of the class using this constant pool table.
*/
public String getClassName() {
return getClassInfo(thisClassInfo);
}
/**
* Returns the index of CONSTANT_Class_info structure
* specifying the class using this constant pool table.
*/
public int getThisClassInfo() {
return thisClassInfo;
}
void setThisClassInfo(int i) {
thisClassInfo = i;
}
ConstInfo getItem(int n) {
return items.elementAt(n);
}
/**
* Returns the tag field of the constant pool table
* entry at the given index.
*/
public int getTag(int index) {
return getItem(index).getTag();
}
/**
* Reads CONSTANT_Class_info structure
* at the given index.
*
* @return a fully-qualified class or interface name specified
* by name_index. If the type is an array
* type, this method returns an encoded name like
* [java.lang.Object; (note that the separators
* are not slashes but dots).
* @see javassist.ClassPool#getCtClass(String)
*/
public String getClassInfo(int index) {
ClassInfo c = (ClassInfo)getItem(index);
if (c == null)
return null;
else
return Descriptor.toJavaName(getUtf8Info(c.name));
}
/**
* Reads the name_index field of the
* CONSTANT_NameAndType_info structure
* at the given index.
*/
public int getNameAndTypeName(int index) {
NameAndTypeInfo ntinfo = (NameAndTypeInfo)getItem(index);
return ntinfo.memberName;
}
/**
* Reads the descriptor_index field of the
* CONSTANT_NameAndType_info structure
* at the given index.
*/
public int getNameAndTypeDescriptor(int index) {
NameAndTypeInfo ntinfo = (NameAndTypeInfo)getItem(index);
return ntinfo.typeDescriptor;
}
/**
* Reads the class_index field of the
* CONSTANT_Fieldref_info,
* CONSTANT_Methodref_info,
* or CONSTANT_Interfaceref_info,
* structure at the given index.
*
* @since 3.6
*/
public int getMemberClass(int index) {
MemberrefInfo minfo = (MemberrefInfo)getItem(index);
return minfo.classIndex;
}
/**
* Reads the name_and_type_index field of the
* CONSTANT_Fieldref_info,
* CONSTANT_Methodref_info,
* or CONSTANT_Interfaceref_info,
* structure at the given index.
*
* @since 3.6
*/
public int getMemberNameAndType(int index) {
MemberrefInfo minfo = (MemberrefInfo)getItem(index);
return minfo.nameAndTypeIndex;
}
/**
* Reads the class_index field of the
* CONSTANT_Fieldref_info structure
* at the given index.
*/
public int getFieldrefClass(int index) {
FieldrefInfo finfo = (FieldrefInfo)getItem(index);
return finfo.classIndex;
}
/**
* Reads the class_index field of the
* CONSTANT_Fieldref_info structure
* at the given index.
*
* @return the name of the class at that class_index.
*/
public String getFieldrefClassName(int index) {
FieldrefInfo f = (FieldrefInfo)getItem(index);
if (f == null)
return null;
else
return getClassInfo(f.classIndex);
}
/**
* Reads the name_and_type_index field of the
* CONSTANT_Fieldref_info structure
* at the given index.
*/
public int getFieldrefNameAndType(int index) {
FieldrefInfo finfo = (FieldrefInfo)getItem(index);
return finfo.nameAndTypeIndex;
}
/**
* Reads the name_index field of the
* CONSTANT_NameAndType_info structure
* indirectly specified by the given index.
*
* @param index an index to a CONSTANT_Fieldref_info.
* @return the name of the field.
*/
public String getFieldrefName(int index) {
FieldrefInfo f = (FieldrefInfo)getItem(index);
if (f == null)
return null;
else {
NameAndTypeInfo n = (NameAndTypeInfo)getItem(f.nameAndTypeIndex);
if(n == null)
return null;
else
return getUtf8Info(n.memberName);
}
}
/**
* Reads the descriptor_index field of the
* CONSTANT_NameAndType_info structure
* indirectly specified by the given index.
*
* @param index an index to a CONSTANT_Fieldref_info.
* @return the type descriptor of the field.
*/
public String getFieldrefType(int index) {
FieldrefInfo f = (FieldrefInfo)getItem(index);
if (f == null)
return null;
else {
NameAndTypeInfo n = (NameAndTypeInfo)getItem(f.nameAndTypeIndex);
if(n == null)
return null;
else
return getUtf8Info(n.typeDescriptor);
}
}
/**
* Reads the class_index field of the
* CONSTANT_Methodref_info structure
* at the given index.
*/
public int getMethodrefClass(int index) {
MethodrefInfo minfo = (MethodrefInfo)getItem(index);
return minfo.classIndex;
}
/**
* Reads the class_index field of the
* CONSTANT_Methodref_info structure
* at the given index.
*
* @return the name of the class at that class_index.
*/
public String getMethodrefClassName(int index) {
MethodrefInfo minfo = (MethodrefInfo)getItem(index);
if (minfo == null)
return null;
else
return getClassInfo(minfo.classIndex);
}
/**
* Reads the name_and_type_index field of the
* CONSTANT_Methodref_info structure
* at the given index.
*/
public int getMethodrefNameAndType(int index) {
MethodrefInfo minfo = (MethodrefInfo)getItem(index);
return minfo.nameAndTypeIndex;
}
/**
* Reads the name_index field of the
* CONSTANT_NameAndType_info structure
* indirectly specified by the given index.
*
* @param index an index to a CONSTANT_Methodref_info.
* @return the name of the method.
*/
public String getMethodrefName(int index) {
MethodrefInfo minfo = (MethodrefInfo)getItem(index);
if (minfo == null)
return null;
else {
NameAndTypeInfo n
= (NameAndTypeInfo)getItem(minfo.nameAndTypeIndex);
if(n == null)
return null;
else
return getUtf8Info(n.memberName);
}
}
/**
* Reads the descriptor_index field of the
* CONSTANT_NameAndType_info structure
* indirectly specified by the given index.
*
* @param index an index to a CONSTANT_Methodref_info.
* @return the descriptor of the method.
*/
public String getMethodrefType(int index) {
MethodrefInfo minfo = (MethodrefInfo)getItem(index);
if (minfo == null)
return null;
else {
NameAndTypeInfo n
= (NameAndTypeInfo)getItem(minfo.nameAndTypeIndex);
if(n == null)
return null;
else
return getUtf8Info(n.typeDescriptor);
}
}
/**
* Reads the class_index field of the
* CONSTANT_InterfaceMethodref_info structure
* at the given index.
*/
public int getInterfaceMethodrefClass(int index) {
InterfaceMethodrefInfo minfo
= (InterfaceMethodrefInfo)getItem(index);
return minfo.classIndex;
}
/**
* Reads the class_index field of the
* CONSTANT_InterfaceMethodref_info structure
* at the given index.
*
* @return the name of the class at that class_index.
*/
public String getInterfaceMethodrefClassName(int index) {
InterfaceMethodrefInfo minfo
= (InterfaceMethodrefInfo)getItem(index);
return getClassInfo(minfo.classIndex);
}
/**
* Reads the name_and_type_index field of the
* CONSTANT_InterfaceMethodref_info structure
* at the given index.
*/
public int getInterfaceMethodrefNameAndType(int index) {
InterfaceMethodrefInfo minfo
= (InterfaceMethodrefInfo)getItem(index);
return minfo.nameAndTypeIndex;
}
/**
* Reads the name_index field of the
* CONSTANT_NameAndType_info structure
* indirectly specified by the given index.
*
* @param index an index to
* a CONSTANT_InterfaceMethodref_info.
* @return the name of the method.
*/
public String getInterfaceMethodrefName(int index) {
InterfaceMethodrefInfo minfo
= (InterfaceMethodrefInfo)getItem(index);
if (minfo == null)
return null;
else {
NameAndTypeInfo n
= (NameAndTypeInfo)getItem(minfo.nameAndTypeIndex);
if(n == null)
return null;
else
return getUtf8Info(n.memberName);
}
}
/**
* Reads the descriptor_index field of the
* CONSTANT_NameAndType_info structure
* indirectly specified by the given index.
*
* @param index an index to
* a CONSTANT_InterfaceMethodref_info.
* @return the descriptor of the method.
*/
public String getInterfaceMethodrefType(int index) {
InterfaceMethodrefInfo minfo
= (InterfaceMethodrefInfo)getItem(index);
if (minfo == null)
return null;
else {
NameAndTypeInfo n
= (NameAndTypeInfo)getItem(minfo.nameAndTypeIndex);
if(n == null)
return null;
else
return getUtf8Info(n.typeDescriptor);
}
}
/**
* Reads CONSTANT_Integer_info, _Float_info,
* _Long_info, _Double_info, or
* _String_info structure.
* These are used with the LDC instruction.
*
* @return a String value or a wrapped primitive-type
* value.
*/
public Object getLdcValue(int index) {
ConstInfo constInfo = this.getItem(index);
Object value = null;
if (constInfo instanceof StringInfo)
value = this.getStringInfo(index);
else if (constInfo instanceof FloatInfo)
value = new Float(getFloatInfo(index));
else if (constInfo instanceof IntegerInfo)
value = new Integer(getIntegerInfo(index));
else if (constInfo instanceof LongInfo)
value = new Long(getLongInfo(index));
else if (constInfo instanceof DoubleInfo)
value = new Double(getDoubleInfo(index));
else
value = null;
return value;
}
/**
* Reads CONSTANT_Integer_info structure
* at the given index.
*
* @return the value specified by this entry.
*/
public int getIntegerInfo(int index) {
IntegerInfo i = (IntegerInfo)getItem(index);
return i.value;
}
/**
* Reads CONSTANT_Float_info structure
* at the given index.
*
* @return the value specified by this entry.
*/
public float getFloatInfo(int index) {
FloatInfo i = (FloatInfo)getItem(index);
return i.value;
}
/**
* Reads CONSTANT_Long_info structure
* at the given index.
*
* @return the value specified by this entry.
*/
public long getLongInfo(int index) {
LongInfo i = (LongInfo)getItem(index);
return i.value;
}
/**
* Reads CONSTANT_Double_info structure
* at the given index.
*
* @return the value specified by this entry.
*/
public double getDoubleInfo(int index) {
DoubleInfo i = (DoubleInfo)getItem(index);
return i.value;
}
/**
* Reads CONSTANT_String_info structure
* at the given index.
*
* @return the string specified by string_index.
*/
public String getStringInfo(int index) {
StringInfo si = (StringInfo)getItem(index);
return getUtf8Info(si.string);
}
/**
* Reads CONSTANT_utf8_info structure
* at the given index.
*
* @return the string specified by this entry.
*/
public String getUtf8Info(int index) {
Utf8Info utf = (Utf8Info)getItem(index);
return utf.string;
}
/**
* Determines whether CONSTANT_Methodref_info
* structure at the given index represents the constructor
* of the given class.
*
* @return the descriptor_index specifying
* the type descriptor of the that constructor.
* If it is not that constructor,
* isConstructor() returns 0.
*/
public int isConstructor(String classname, int index) {
return isMember(classname, MethodInfo.nameInit, index);
}
/**
* Determines whether CONSTANT_Methodref_info,
* CONSTANT_Fieldref_info, or
* CONSTANT_InterfaceMethodref_info structure
* at the given index represents the member with the specified
* name and declaring class.
*
* @param classname the class declaring the member
* @param membername the member name
* @param index the index into the constant pool table
*
* @return the descriptor_index specifying
* the type descriptor of that member.
* If it is not that member,
* isMember() returns 0.
*/
public int isMember(String classname, String membername, int index) {
MemberrefInfo minfo = (MemberrefInfo)getItem(index);
if (getClassInfo(minfo.classIndex).equals(classname)) {
NameAndTypeInfo ntinfo
= (NameAndTypeInfo)getItem(minfo.nameAndTypeIndex);
if (getUtf8Info(ntinfo.memberName).equals(membername))
return ntinfo.typeDescriptor;
}
return 0; // false
}
/**
* Determines whether CONSTANT_Methodref_info,
* CONSTANT_Fieldref_info, or
* CONSTANT_InterfaceMethodref_info structure
* at the given index has the name and the descriptor
* given as the arguments.
*
* @param membername the member name
* @param desc the descriptor of the member.
* @param index the index into the constant pool table
*
* @return the name of the target class specified by
* the ..._info structure
* at index.
* Otherwise, null if that structure does not
* match the given member name and descriptor.
*/
public String eqMember(String membername, String desc, int index) {
MemberrefInfo minfo = (MemberrefInfo)getItem(index);
NameAndTypeInfo ntinfo
= (NameAndTypeInfo)getItem(minfo.nameAndTypeIndex);
if (getUtf8Info(ntinfo.memberName).equals(membername)
&& getUtf8Info(ntinfo.typeDescriptor).equals(desc))
return getClassInfo(minfo.classIndex);
else
return null; // false
}
private int addItem(ConstInfo info) {
items.addElement(info);
return numOfItems++;
}
/**
* Copies the n-th item in this ConstPool object into the destination
* ConstPool object.
* The class names that the item refers to are renamed according
* to the given map.
*
* @param n the n-th item
* @param dest destination constant pool table
* @param classnames the map or null.
* @return the index of the copied item into the destination ClassPool.
*/
public int copy(int n, ConstPool dest, Map classnames) {
if (n == 0)
return 0;
ConstInfo info = getItem(n);
return info.copy(this, dest, classnames);
}
int addConstInfoPadding() {
return addItem(new ConstInfoPadding());
}
/**
* Adds a new CONSTANT_Class_info structure.
*
* This also adds a CONSTANT_Utf8_info structure
* for storing the class name.
*
* @return the index of the added entry.
*/
public int addClassInfo(CtClass c) {
if (c == THIS)
return thisClassInfo;
else if (!c.isArray())
return addClassInfo(c.getName());
else {
// an array type is recorded in the hashtable with
// the key "[L;" instead of "".
//
// note: toJvmName(toJvmName(c)) is equal to toJvmName(c).
return addClassInfo(Descriptor.toJvmName(c));
}
}
/**
* Adds a new CONSTANT_Class_info structure.
*
* This also adds a CONSTANT_Utf8_info structure
* for storing the class name.
*
* @param qname a fully-qualified class name
* (or the JVM-internal representation of that name).
* @return the index of the added entry.
*/
public int addClassInfo(String qname) {
ClassInfo info = (ClassInfo)classes.get(qname);
if (info != null)
return info.index;
else {
int utf8 = addUtf8Info(Descriptor.toJvmName(qname));
info = new ClassInfo(utf8, numOfItems);
classes.put(qname, info);
return addItem(info);
}
}
/**
* Adds a new CONSTANT_NameAndType_info structure.
*
*
This also adds CONSTANT_Utf8_info structures.
*
* @param name name_index
* @param type descriptor_index
* @return the index of the added entry.
*/
public int addNameAndTypeInfo(String name, String type) {
return addNameAndTypeInfo(addUtf8Info(name), addUtf8Info(type));
}
/**
* Adds a new CONSTANT_NameAndType_info structure.
*
* @param name name_index
* @param type descriptor_index
* @return the index of the added entry.
*/
public int addNameAndTypeInfo(int name, int type) {
int h = hashFunc(name, type);
ConstInfo ci = constInfoCache[h];
if (ci != null && ci instanceof NameAndTypeInfo && ci.hashCheck(name, type))
return constInfoIndexCache[h];
else {
NameAndTypeInfo item = new NameAndTypeInfo(name, type);
constInfoCache[h] = item;
int i = addItem(item);
constInfoIndexCache[h] = i;
return i;
}
}
/**
* Adds a new CONSTANT_Fieldref_info structure.
*
*
This also adds a new CONSTANT_NameAndType_info
* structure.
*
* @param classInfo class_index
* @param name name_index
* of CONSTANT_NameAndType_info.
* @param type descriptor_index
* of CONSTANT_NameAndType_info.
* @return the index of the added entry.
*/
public int addFieldrefInfo(int classInfo, String name, String type) {
int nt = addNameAndTypeInfo(name, type);
return addFieldrefInfo(classInfo, nt);
}
/**
* Adds a new CONSTANT_Fieldref_info structure.
*
* @param classInfo class_index
* @param nameAndTypeInfo name_and_type_index.
* @return the index of the added entry.
*/
public int addFieldrefInfo(int classInfo, int nameAndTypeInfo) {
int h = hashFunc(classInfo, nameAndTypeInfo);
ConstInfo ci = constInfoCache[h];
if (ci != null && ci instanceof FieldrefInfo && ci.hashCheck(classInfo, nameAndTypeInfo))
return constInfoIndexCache[h];
else {
FieldrefInfo item = new FieldrefInfo(classInfo, nameAndTypeInfo);
constInfoCache[h] = item;
int i = addItem(item);
constInfoIndexCache[h] = i;
return i;
}
}
/**
* Adds a new CONSTANT_Methodref_info structure.
*
*
This also adds a new CONSTANT_NameAndType_info
* structure.
*
* @param classInfo class_index
* @param name name_index
* of CONSTANT_NameAndType_info.
* @param type descriptor_index
* of CONSTANT_NameAndType_info.
* @return the index of the added entry.
*/
public int addMethodrefInfo(int classInfo, String name, String type) {
int nt = addNameAndTypeInfo(name, type);
return addMethodrefInfo(classInfo, nt);
}
/**
* Adds a new CONSTANT_Methodref_info structure.
*
* @param classInfo class_index
* @param nameAndTypeInfo name_and_type_index.
* @return the index of the added entry.
*/
public int addMethodrefInfo(int classInfo, int nameAndTypeInfo) {
int h = hashFunc(classInfo, nameAndTypeInfo);
ConstInfo ci = constInfoCache[h];
if (ci != null && ci instanceof MethodrefInfo && ci.hashCheck(classInfo, nameAndTypeInfo))
return constInfoIndexCache[h];
else {
MethodrefInfo item = new MethodrefInfo(classInfo, nameAndTypeInfo);
constInfoCache[h] = item;
int i = addItem(item);
constInfoIndexCache[h] = i;
return i;
}
}
/**
* Adds a new CONSTANT_InterfaceMethodref_info
* structure.
*
*
This also adds a new CONSTANT_NameAndType_info
* structure.
*
* @param classInfo class_index
* @param name name_index
* of CONSTANT_NameAndType_info.
* @param type descriptor_index
* of CONSTANT_NameAndType_info.
* @return the index of the added entry.
*/
public int addInterfaceMethodrefInfo(int classInfo, String name,
String type) {
int nt = addNameAndTypeInfo(name, type);
return addInterfaceMethodrefInfo(classInfo, nt);
}
/**
* Adds a new CONSTANT_InterfaceMethodref_info
* structure.
*
* @param classInfo class_index
* @param nameAndTypeInfo name_and_type_index.
* @return the index of the added entry.
*/
public int addInterfaceMethodrefInfo(int classInfo,
int nameAndTypeInfo) {
int h = hashFunc(classInfo, nameAndTypeInfo);
ConstInfo ci = constInfoCache[h];
if (ci != null && ci instanceof InterfaceMethodrefInfo && ci.hashCheck(classInfo, nameAndTypeInfo))
return constInfoIndexCache[h];
else {
InterfaceMethodrefInfo item =new InterfaceMethodrefInfo(classInfo, nameAndTypeInfo);
constInfoCache[h] = item;
int i = addItem(item);
constInfoIndexCache[h] = i;
return i;
}
}
/**
* Adds a new CONSTANT_String_info
* structure.
*
*
This also adds a new CONSTANT_Utf8_info
* structure.
*
* @return the index of the added entry.
*/
public int addStringInfo(String str) {
return addItem(new StringInfo(addUtf8Info(str)));
}
/**
* Adds a new CONSTANT_Integer_info
* structure.
*
* @return the index of the added entry.
*/
public int addIntegerInfo(int i) {
return addItem(new IntegerInfo(i));
}
/**
* Adds a new CONSTANT_Float_info
* structure.
*
* @return the index of the added entry.
*/
public int addFloatInfo(float f) {
return addItem(new FloatInfo(f));
}
/**
* Adds a new CONSTANT_Long_info
* structure.
*
* @return the index of the added entry.
*/
public int addLongInfo(long l) {
int i = addItem(new LongInfo(l));
addItem(new ConstInfoPadding());
return i;
}
/**
* Adds a new CONSTANT_Double_info
* structure.
*
* @return the index of the added entry.
*/
public int addDoubleInfo(double d) {
int i = addItem(new DoubleInfo(d));
addItem(new ConstInfoPadding());
return i;
}
/**
* Adds a new CONSTANT_Utf8_info
* structure.
*
*
If the given utf8 string has been already recorded in the
* table, then this method does not add a new entry to avoid adding
* a duplicated entry.
* Instead, it returns the index of the entry already recorded.
*
* @return the index of the added entry.
*/
public int addUtf8Info(String utf8) {
Utf8Info info = (Utf8Info)strings.get(utf8);
if (info != null)
return info.index;
else {
info = new Utf8Info(utf8, numOfItems);
strings.put(utf8, info);
return addItem(info);
}
}
/**
* Get all the class names.
*
* @return a set of class names
*/
public Set getClassNames()
{
HashSet result = new HashSet();
LongVector v = items;
int size = numOfItems;
for (int i = 1; i < size; ++i) {
String className = v.elementAt(i).getClassName(this);
if (className != null)
result.add(className);
}
return result;
}
/**
* Replaces all occurrences of a class name.
*
* @param oldName the replaced name (JVM-internal representation).
* @param newName the substituted name (JVM-internal representation).
*/
public void renameClass(String oldName, String newName) {
LongVector v = items;
int size = numOfItems;
classes = new HashMap(classes.size() * 2);
for (int i = 1; i < size; ++i) {
ConstInfo ci = v.elementAt(i);
ci.renameClass(this, oldName, newName);
ci.makeHashtable(this);
}
}
/**
* Replaces all occurrences of class names.
*
* @param classnames specifies pairs of replaced and substituted
* name.
*/
public void renameClass(Map classnames) {
LongVector v = items;
int size = numOfItems;
classes = new HashMap(classes.size() * 2);
for (int i = 1; i < size; ++i) {
ConstInfo ci = v.elementAt(i);
ci.renameClass(this, classnames);
ci.makeHashtable(this);
}
}
private void read(DataInputStream in) throws IOException {
int n = in.readUnsignedShort();
items = new LongVector(n);
numOfItems = 0;
addItem(null); // index 0 is reserved by the JVM.
while (--n > 0) { // index 0 is reserved by JVM
int tag = readOne(in);
if ((tag == LongInfo.tag) || (tag == DoubleInfo.tag)) {
addItem(new ConstInfoPadding());
--n;
}
}
int i = 1;
while (true) {
ConstInfo info = items.elementAt(i++);
if (info == null)
break;
else
info.makeHashtable(this);
}
}
private int readOne(DataInputStream in) throws IOException {
ConstInfo info;
int tag = in.readUnsignedByte();
switch (tag) {
case Utf8Info.tag : // 1
info = new Utf8Info(in, numOfItems);
strings.put(((Utf8Info)info).string, info);
break;
case IntegerInfo.tag : // 3
info = new IntegerInfo(in);
break;
case FloatInfo.tag : // 4
info = new FloatInfo(in);
break;
case LongInfo.tag : // 5
info = new LongInfo(in);
break;
case DoubleInfo.tag : // 6
info = new DoubleInfo(in);
break;
case ClassInfo.tag : // 7
info = new ClassInfo(in, numOfItems);
// classes.put(, info);
break;
case StringInfo.tag : // 8
info = new StringInfo(in);
break;
case FieldrefInfo.tag : // 9
info = new FieldrefInfo(in);
break;
case MethodrefInfo.tag : // 10
info = new MethodrefInfo(in);
break;
case InterfaceMethodrefInfo.tag : // 11
info = new InterfaceMethodrefInfo(in);
break;
case NameAndTypeInfo.tag : // 12
info = new NameAndTypeInfo(in);
break;
default :
throw new IOException("invalid constant type: " + tag);
}
addItem(info);
return tag;
}
/**
* Writes the contents of the constant pool table.
*/
public void write(DataOutputStream out) throws IOException {
out.writeShort(numOfItems);
LongVector v = items;
int size = numOfItems;
for (int i = 1; i < size; ++i)
v.elementAt(i).write(out);
}
/**
* Prints the contents of the constant pool table.
*/
public void print() {
print(new PrintWriter(System.out, true));
}
/**
* Prints the contents of the constant pool table.
*/
public void print(PrintWriter out) {
int size = numOfItems;
for (int i = 1; i < size; ++i) {
out.print(i);
out.print(" ");
items.elementAt(i).print(out);
}
}
}
abstract class ConstInfo {
public abstract int getTag();
public String getClassName(ConstPool cp) { return null; }
public void renameClass(ConstPool cp, String oldName, String newName) {}
public void renameClass(ConstPool cp, Map classnames) {}
public abstract int copy(ConstPool src, ConstPool dest, Map classnames);
// ** classnames is a mapping between JVM names.
public abstract void write(DataOutputStream out) throws IOException;
public abstract void print(PrintWriter out);
void makeHashtable(ConstPool cp) {} // called after read() finishes in ConstPool.
boolean hashCheck(int a, int b) { return false; }
public String toString() {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
PrintWriter out = new PrintWriter(bout);
print(out);
return bout.toString();
}
}
/* padding following DoubleInfo or LongInfo.
*/
class ConstInfoPadding extends ConstInfo {
public int getTag() { return 0; }
public int copy(ConstPool src, ConstPool dest, Map map) {
return dest.addConstInfoPadding();
}
public void write(DataOutputStream out) throws IOException {}
public void print(PrintWriter out) {
out.println("padding");
}
}
class ClassInfo extends ConstInfo {
static final int tag = 7;
int name;
int index;
public ClassInfo(int className, int i) {
name = className;
index = i;
}
public ClassInfo(DataInputStream in, int i) throws IOException {
name = in.readUnsignedShort();
index = i;
}
public int getTag() { return tag; }
public String getClassName(ConstPool cp) {
return cp.getUtf8Info(name);
};
public void renameClass(ConstPool cp, String oldName, String newName) {
String nameStr = cp.getUtf8Info(name);
if (nameStr.equals(oldName))
name = cp.addUtf8Info(newName);
else if (nameStr.charAt(0) == '[') {
String nameStr2 = Descriptor.rename(nameStr, oldName, newName);
if (nameStr != nameStr2)
name = cp.addUtf8Info(nameStr2);
}
}
public void renameClass(ConstPool cp, Map map) {
String oldName = cp.getUtf8Info(name);
if (oldName.charAt(0) == '[') {
String newName = Descriptor.rename(oldName, map);
if (oldName != newName)
name = cp.addUtf8Info(newName);
}
else {
String newName = (String)map.get(oldName);
if (newName != null && !newName.equals(oldName))
name = cp.addUtf8Info(newName);
}
}
public int copy(ConstPool src, ConstPool dest, Map map) {
String classname = src.getUtf8Info(name);
if (map != null) {
String newname = (String)map.get(classname);
if (newname != null)
classname = newname;
}
return dest.addClassInfo(classname);
}
public void write(DataOutputStream out) throws IOException {
out.writeByte(tag);
out.writeShort(name);
}
public void print(PrintWriter out) {
out.print("Class #");
out.println(name);
}
void makeHashtable(ConstPool cp) {
String name = Descriptor.toJavaName(getClassName(cp));
cp.classes.put(name, this);
}
}
class NameAndTypeInfo extends ConstInfo {
static final int tag = 12;
int memberName;
int typeDescriptor;
public NameAndTypeInfo(int name, int type) {
memberName = name;
typeDescriptor = type;
}
public NameAndTypeInfo(DataInputStream in) throws IOException {
memberName = in.readUnsignedShort();
typeDescriptor = in.readUnsignedShort();
}
boolean hashCheck(int a, int b) { return a == memberName && b == typeDescriptor; }
public int getTag() { return tag; }
public void renameClass(ConstPool cp, String oldName, String newName) {
String type = cp.getUtf8Info(typeDescriptor);
String type2 = Descriptor.rename(type, oldName, newName);
if (type != type2)
typeDescriptor = cp.addUtf8Info(type2);
}
public void renameClass(ConstPool cp, Map map) {
String type = cp.getUtf8Info(typeDescriptor);
String type2 = Descriptor.rename(type, map);
if (type != type2)
typeDescriptor = cp.addUtf8Info(type2);
}
public int copy(ConstPool src, ConstPool dest, Map map) {
String mname = src.getUtf8Info(memberName);
String tdesc = src.getUtf8Info(typeDescriptor);
tdesc = Descriptor.rename(tdesc, map);
return dest.addNameAndTypeInfo(dest.addUtf8Info(mname),
dest.addUtf8Info(tdesc));
}
public void write(DataOutputStream out) throws IOException {
out.writeByte(tag);
out.writeShort(memberName);
out.writeShort(typeDescriptor);
}
public void print(PrintWriter out) {
out.print("NameAndType #");
out.print(memberName);
out.print(", type #");
out.println(typeDescriptor);
}
}
abstract class MemberrefInfo extends ConstInfo {
int classIndex;
int nameAndTypeIndex;
public MemberrefInfo(int cindex, int ntindex) {
classIndex = cindex;
nameAndTypeIndex = ntindex;
}
public MemberrefInfo(DataInputStream in) throws IOException {
classIndex = in.readUnsignedShort();
nameAndTypeIndex = in.readUnsignedShort();
}
public int copy(ConstPool src, ConstPool dest, Map map) {
int classIndex2 = src.getItem(classIndex).copy(src, dest, map);
int ntIndex2 = src.getItem(nameAndTypeIndex).copy(src, dest, map);
return copy2(dest, classIndex2, ntIndex2);
}
boolean hashCheck(int a, int b) { return a == classIndex && b == nameAndTypeIndex; }
abstract protected int copy2(ConstPool dest, int cindex, int ntindex);
public void write(DataOutputStream out) throws IOException {
out.writeByte(getTag());
out.writeShort(classIndex);
out.writeShort(nameAndTypeIndex);
}
public void print(PrintWriter out) {
out.print(getTagName() + " #");
out.print(classIndex);
out.print(", name&type #");
out.println(nameAndTypeIndex);
}
public abstract String getTagName();
}
class FieldrefInfo extends MemberrefInfo {
static final int tag = 9;
public FieldrefInfo(int cindex, int ntindex) {
super(cindex, ntindex);
}
public FieldrefInfo(DataInputStream in) throws IOException {
super(in);
}
public int getTag() { return tag; }
public String getTagName() { return "Field"; }
protected int copy2(ConstPool dest, int cindex, int ntindex) {
return dest.addFieldrefInfo(cindex, ntindex);
}
}
class MethodrefInfo extends MemberrefInfo {
static final int tag = 10;
public MethodrefInfo(int cindex, int ntindex) {
super(cindex, ntindex);
}
public MethodrefInfo(DataInputStream in) throws IOException {
super(in);
}
public int getTag() { return tag; }
public String getTagName() { return "Method"; }
protected int copy2(ConstPool dest, int cindex, int ntindex) {
return dest.addMethodrefInfo(cindex, ntindex);
}
}
class InterfaceMethodrefInfo extends MemberrefInfo {
static final int tag = 11;
public InterfaceMethodrefInfo(int cindex, int ntindex) {
super(cindex, ntindex);
}
public InterfaceMethodrefInfo(DataInputStream in) throws IOException {
super(in);
}
public int getTag() { return tag; }
public String getTagName() { return "Interface"; }
protected int copy2(ConstPool dest, int cindex, int ntindex) {
return dest.addInterfaceMethodrefInfo(cindex, ntindex);
}
}
class StringInfo extends ConstInfo {
static final int tag = 8;
int string;
public StringInfo(int str) {
string = str;
}
public StringInfo(DataInputStream in) throws IOException {
string = in.readUnsignedShort();
}
public int getTag() { return tag; }
public int copy(ConstPool src, ConstPool dest, Map map) {
return dest.addStringInfo(src.getUtf8Info(string));
}
public void write(DataOutputStream out) throws IOException {
out.writeByte(tag);
out.writeShort(string);
}
public void print(PrintWriter out) {
out.print("String #");
out.println(string);
}
}
class IntegerInfo extends ConstInfo {
static final int tag = 3;
int value;
public IntegerInfo(int i) {
value = i;
}
public IntegerInfo(DataInputStream in) throws IOException {
value = in.readInt();
}
public int getTag() { return tag; }
public int copy(ConstPool src, ConstPool dest, Map map) {
return dest.addIntegerInfo(value);
}
public void write(DataOutputStream out) throws IOException {
out.writeByte(tag);
out.writeInt(value);
}
public void print(PrintWriter out) {
out.print("Integer ");
out.println(value);
}
}
class FloatInfo extends ConstInfo {
static final int tag = 4;
float value;
public FloatInfo(float f) {
value = f;
}
public FloatInfo(DataInputStream in) throws IOException {
value = in.readFloat();
}
public int getTag() { return tag; }
public int copy(ConstPool src, ConstPool dest, Map map) {
return dest.addFloatInfo(value);
}
public void write(DataOutputStream out) throws IOException {
out.writeByte(tag);
out.writeFloat(value);
}
public void print(PrintWriter out) {
out.print("Float ");
out.println(value);
}
}
class LongInfo extends ConstInfo {
static final int tag = 5;
long value;
public LongInfo(long l) {
value = l;
}
public LongInfo(DataInputStream in) throws IOException {
value = in.readLong();
}
public int getTag() { return tag; }
public int copy(ConstPool src, ConstPool dest, Map map) {
return dest.addLongInfo(value);
}
public void write(DataOutputStream out) throws IOException {
out.writeByte(tag);
out.writeLong(value);
}
public void print(PrintWriter out) {
out.print("Long ");
out.println(value);
}
}
class DoubleInfo extends ConstInfo {
static final int tag = 6;
double value;
public DoubleInfo(double d) {
value = d;
}
public DoubleInfo(DataInputStream in) throws IOException {
value = in.readDouble();
}
public int getTag() { return tag; }
public int copy(ConstPool src, ConstPool dest, Map map) {
return dest.addDoubleInfo(value);
}
public void write(DataOutputStream out) throws IOException {
out.writeByte(tag);
out.writeDouble(value);
}
public void print(PrintWriter out) {
out.print("Double ");
out.println(value);
}
}
class Utf8Info extends ConstInfo {
static final int tag = 1;
String string;
int index;
public Utf8Info(String utf8, int i) {
string = utf8;
index = i;
}
public Utf8Info(DataInputStream in, int i) throws IOException {
string = in.readUTF();
index = i;
}
public int getTag() { return tag; }
public int copy(ConstPool src, ConstPool dest, Map map) {
return dest.addUtf8Info(string);
}
public void write(DataOutputStream out) throws IOException {
out.writeByte(tag);
out.writeUTF(string);
}
public void print(PrintWriter out) {
out.print("UTF8 \"");
out.print(string);
out.println("\"");
}
}