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/* ====================================================================
* 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 [email protected].
*
* 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
* utf8Cache = new HashMap();
private Map methodCache = new HashMap();
private Map fieldCache = new HashMap();
public int getSize() {
return poolSize;
}
public ConstantPool() {
pool = new Constant[10];
poolSize = 0;
}
public ConstantPool(Constant[] constants) {
pool = constants;
poolSize = (constants == null ? 0 : constants.length);
}
ConstantPool(DataInputStream file) throws IOException {
byte tag;
poolSize = file.readUnsignedShort();
pool = new Constant[poolSize];
// pool[0] is unused by the compiler and may be used freely by the implementation
for (int i = 1; i < poolSize; i++) {
pool[i] = Constant.readConstant(file);
tag = pool[i].getTag();
if ((tag == Constants.CONSTANT_Double) || (tag == Constants.CONSTANT_Long)) {
i++;
}
}
}
public Constant getConstant(int index, byte tag) {
Constant c = getConstant(index);
// if (c == null) throw new ClassFormatException("Constant pool at index " + index + " is null.");
if (c.tag == tag)
return c;
throw new ClassFormatException("Expected class '" + Constants.CONSTANT_NAMES[tag] + "' at index " + index + " and found "
+ c);
}
public Constant getConstant(int index) {
try {
return pool[index];
} catch (ArrayIndexOutOfBoundsException aioobe) {
throw new ClassFormatException("Index " + index + " into constant pool (size:" + poolSize + ") is invalid");
}
}
/**
* @return deep copy of this constant pool
*/
public ConstantPool copy() {
Constant[] newConstants = new Constant[poolSize]; // use the correct size
for (int i = 1; i < poolSize; i++) {
if (pool[i] != null) {
newConstants[i] = pool[i].copy();
}
}
return new ConstantPool(newConstants);
}
/**
* Get string from constant pool and bypass the indirection of `ConstantClass' and `ConstantString' objects. I.e. these classes
* have an index field that points to another entry of the constant pool of type `ConstantUtf8' which contains the real data.
*
* @param index Index in constant pool
* @param tag Tag of expected constant, either ConstantClass or ConstantString
* @return Contents of string reference
* @see ConstantClass
* @see ConstantString
* @throws ClassFormatException
*/
public String getConstantString(int index, byte tag) throws ClassFormatException {
Constant c = getConstant(index, tag);
int i;
/*
* This switch() is not that elegant, since the two classes have the same contents, they just differ in the name of the
* index field variable. But we want to stick to the JVM naming conventions closely though we could have solved these more
* elegantly by using the same variable name or by subclassing.
*/
// OPTIMIZE remove the difference - use the an interface and same index methods for string ref id
switch (tag) {
case Constants.CONSTANT_Class:
i = ((ConstantClass) c).getNameIndex();
break;
case Constants.CONSTANT_String:
i = ((ConstantString) c).getStringIndex();
break;
default:
throw new RuntimeException("getConstantString called with illegal tag " + tag);
}
// Finally get the string from the constant pool
c = getConstant(i, Constants.CONSTANT_Utf8);
return ((ConstantUtf8) c).getValue();
}
/**
* Resolve constant to a string representation.
*/
public String constantToString(Constant c) {
String str;
int i;
switch (c.tag) {
case Constants.CONSTANT_Class:
i = ((ConstantClass) c).getNameIndex();
c = getConstant(i, Constants.CONSTANT_Utf8);
str = Utility.compactClassName(((ConstantUtf8) c).getValue(), false);
break;
case Constants.CONSTANT_String:
i = ((ConstantString) c).getStringIndex();
c = getConstant(i, Constants.CONSTANT_Utf8);
str = "\"" + escape(((ConstantUtf8) c).getValue()) + "\"";
break;
case Constants.CONSTANT_Utf8:
case Constants.CONSTANT_Double:
case Constants.CONSTANT_Float:
case Constants.CONSTANT_Long:
case Constants.CONSTANT_Integer:
str = ((SimpleConstant) c).getStringValue();
break;
case Constants.CONSTANT_NameAndType:
str = (constantToString(((ConstantNameAndType) c).getNameIndex(), Constants.CONSTANT_Utf8) + " " + constantToString(
((ConstantNameAndType) c).getSignatureIndex(), Constants.CONSTANT_Utf8));
break;
case Constants.CONSTANT_InterfaceMethodref:
case Constants.CONSTANT_Methodref:
case Constants.CONSTANT_Fieldref:
str = (constantToString(((ConstantCP) c).getClassIndex(), Constants.CONSTANT_Class) + "." + constantToString(
((ConstantCP) c).getNameAndTypeIndex(), Constants.CONSTANT_NameAndType));
break;
case Constants.CONSTANT_InvokeDynamic:
ConstantInvokeDynamic cid = (ConstantInvokeDynamic)c;
str = cid.toString();
break;
default: // Never reached
throw new RuntimeException("Unknown constant type " + c.tag);
}
return str;
}
private static final String escape(String str) {
int len = str.length();
StringBuffer buf = new StringBuffer(len + 5);
char[] ch = str.toCharArray();
for (int i = 0; i < len; i++) {
switch (ch[i]) {
case '\n':
buf.append("\\n");
break;
case '\r':
buf.append("\\r");
break;
case '\t':
buf.append("\\t");
break;
case '\b':
buf.append("\\b");
break;
case '"':
buf.append("\\\"");
break;
default:
buf.append(ch[i]);
}
}
return buf.toString();
}
public String constantToString(int index, byte tag) {
Constant c = getConstant(index, tag);
return constantToString(c);
}
public String constantToString(int index) {
return constantToString(getConstant(index));
}
public void accept(ClassVisitor v) {
v.visitConstantPool(this);
}
public Constant[] getConstantPool() {
return pool;
} // TEMPORARY, DONT LIKE PASSING THIS DATA OUT!
public void dump(DataOutputStream file) throws IOException {
file.writeShort(poolSize);
for (int i = 1; i < poolSize; i++)
if (pool[i] != null)
pool[i].dump(file);
}
public ConstantUtf8 getConstantUtf8(int index) {
Constant c = getConstant(index);
assert c != null;
assert c.tag == Constants.CONSTANT_Utf8;
return (ConstantUtf8) c;
}
public String getConstantString_CONSTANTClass(int index) {
ConstantClass c = (ConstantClass) getConstant(index, Constants.CONSTANT_Class);
index = c.getNameIndex();
return ((ConstantUtf8) getConstant(index, Constants.CONSTANT_Utf8)).getValue();
}
public int getLength() {
return poolSize;
}
@Override
public String toString() {
StringBuffer buf = new StringBuffer();
for (int i = 1; i < poolSize; i++)
buf.append(i + ")" + pool[i] + "\n");
return buf.toString();
}
public int lookupInteger(int n) {
for (int i = 1; i < poolSize; i++) {
if (pool[i] instanceof ConstantInteger) {
ConstantInteger c = (ConstantInteger) pool[i];
if (c.getValue() == n)
return i;
}
}
return -1;
}
public int lookupUtf8(String string) {
Integer pos = utf8Cache.get(string);
if (pos != null) {
return pos;
}
for (int i = 1; i < poolSize; i++) {
Constant c = pool[i];
if (c != null && c.tag == Constants.CONSTANT_Utf8) {
if (((ConstantUtf8) c).getValue().equals(string)) {
utf8Cache.put(string, i);
return i;
}
}
}
return -1;
}
public int lookupClass(String classname) {
for (int i = 1; i < poolSize; i++) {
Constant c = pool[i];
if (c != null && c.tag == Constants.CONSTANT_Class) {
int cIndex = ((ConstantClass) c).getNameIndex();
String cName = ((ConstantUtf8) pool[cIndex]).getValue();
if (cName.equals(classname))
return i;
}
}
return -1;
}
public int addUtf8(String n) {
int ret = lookupUtf8(n);
if (ret != -1)
return ret;
adjustSize();
ret = poolSize;
pool[poolSize++] = new ConstantUtf8(n);
return ret;
}
public int addInteger(int n) {
int ret = lookupInteger(n);
if (ret != -1)
return ret;
adjustSize();
ret = poolSize;
pool[poolSize++] = new ConstantInteger(n);
return ret;
}
public int addArrayClass(ArrayType type) {
return addClass(type.getSignature());
}
public int addClass(ObjectType type) {
return addClass(type.getClassName());
}
public int addClass(String classname) {
String toAdd = classname.replace('.', '/');
int ret = lookupClass(toAdd);
if (ret != -1)
return ret;
adjustSize();
ConstantClass c = new ConstantClass(addUtf8(toAdd));
ret = poolSize;
pool[poolSize++] = c;
return ret;
}
private void adjustSize() {
if (poolSize + 3 >= pool.length) {
Constant[] cs = pool;
pool = new Constant[cs.length + 8];
System.arraycopy(cs, 0, pool, 0, cs.length);
}
if (poolSize == 0)
poolSize = 1; // someone about to do something in here!
}
public int addFieldref(String class_name, String field_name, String signature) {
int ret = lookupFieldref(class_name, field_name, signature);
int class_index, name_and_type_index;
if (ret != -1)
return ret;
adjustSize();
class_index = addClass(class_name);
name_and_type_index = addNameAndType(field_name, signature);
ret = poolSize;
pool[poolSize++] = new ConstantFieldref(class_index, name_and_type_index);
return ret;
}
public int lookupFieldref(String searchClassname, String searchFieldname, String searchSignature) {
searchClassname = searchClassname.replace('.', '/');
String k = new StringBuffer().append(searchClassname).append(searchFieldname).append(searchSignature).toString();
Integer pos = fieldCache.get(k);
if (pos != null)
return pos.intValue();
for (int i = 1; i < poolSize; i++) {
Constant c = pool[i];
if (c != null && c.tag == Constants.CONSTANT_Fieldref) {
ConstantFieldref cfr = (ConstantFieldref) c;
ConstantNameAndType cnat = (ConstantNameAndType) pool[cfr.getNameAndTypeIndex()];
// check the class
int cIndex = cfr.getClassIndex();
ConstantClass cc = (ConstantClass) pool[cIndex];
String cName = ((ConstantUtf8) pool[cc.getNameIndex()]).getValue();
if (!cName.equals(searchClassname))
continue;
// check the name and type
String name = ((ConstantUtf8) pool[cnat.getNameIndex()]).getValue();
if (!name.equals(searchFieldname))
continue; // not this one
String typeSignature = ((ConstantUtf8) pool[cnat.getSignatureIndex()]).getValue();
if (!typeSignature.equals(searchSignature))
continue;
fieldCache.put(k, new Integer(i));
return i;
}
}
return -1;
}
public int addNameAndType(String name, String signature) {
int ret = lookupNameAndType(name, signature);
if (ret != -1)
return ret;
adjustSize();
int name_index = addUtf8(name);
int signature_index = addUtf8(signature);
ret = poolSize;
pool[poolSize++] = new ConstantNameAndType(name_index, signature_index);
return ret;
}
public int lookupNameAndType(String searchName, String searchTypeSignature) {
for (int i = 1; i < poolSize; i++) {
Constant c = pool[i];
if (c != null && c.tag == Constants.CONSTANT_NameAndType) {
ConstantNameAndType cnat = (ConstantNameAndType) c;
String name = ((ConstantUtf8) pool[cnat.getNameIndex()]).getValue();
if (!name.equals(searchName))
continue; // not this one
String typeSignature = ((ConstantUtf8) pool[cnat.getSignatureIndex()]).getValue();
if (!typeSignature.equals(searchTypeSignature))
continue;
return i;
}
}
return -1;
}
public int addFloat(float f) {
int ret = lookupFloat(f);
if (ret != -1)
return ret;
adjustSize();
ret = poolSize;
pool[poolSize++] = new ConstantFloat(f);
return ret;
}
public int lookupFloat(float f) {
int bits = Float.floatToIntBits(f);
for (int i = 1; i < poolSize; i++) {
Constant c = pool[i];
if (c != null && c.tag == Constants.CONSTANT_Float) {
ConstantFloat cf = (ConstantFloat) c;
if (Float.floatToIntBits(cf.getValue()) == bits)
return i;
}
}
return -1;
}
public int addDouble(double d) {
int ret = lookupDouble(d);
if (ret != -1)
return ret;
adjustSize();
ret = poolSize;
pool[poolSize] = new ConstantDouble(d);
poolSize += 2;
return ret;
}
public int lookupDouble(double d) {
long bits = Double.doubleToLongBits(d);
for (int i = 1; i < poolSize; i++) {
Constant c = pool[i];
if (c != null && c.tag == Constants.CONSTANT_Double) {
ConstantDouble cf = (ConstantDouble) c;
if (Double.doubleToLongBits(cf.getValue()) == bits)
return i;
}
}
return -1;
}
public int addLong(long l) {
int ret = lookupLong(l);
if (ret != -1)
return ret;
adjustSize();
ret = poolSize;
pool[poolSize] = new ConstantLong(l);
poolSize += 2;
return ret;
}
public int lookupString(String s) {
for (int i = 1; i < poolSize; i++) {
Constant c = pool[i];
if (c != null && c.tag == Constants.CONSTANT_String) {
ConstantString cs = (ConstantString) c;
ConstantUtf8 cu8 = (ConstantUtf8) pool[cs.getStringIndex()];
if (cu8.getValue().equals(s))
return i;
}
}
return -1;
}
public int addString(String str) {
int ret = lookupString(str);
if (ret != -1)
return ret;
int utf8 = addUtf8(str);
adjustSize();
ConstantString s = new ConstantString(utf8);
ret = poolSize;
pool[poolSize++] = s;
return ret;
}
public int lookupLong(long l) {
for (int i = 1; i < poolSize; i++) {
Constant c = pool[i];
if (c != null && c.tag == Constants.CONSTANT_Long) {
ConstantLong cf = (ConstantLong) c;
if (cf.getValue() == l)
return i;
}
}
return -1;
}
public int addConstant(Constant c, ConstantPool cp) {
Constant[] constants = cp.getConstantPool();
switch (c.getTag()) {
case Constants.CONSTANT_String: {
ConstantString s = (ConstantString) c;
ConstantUtf8 u8 = (ConstantUtf8) constants[s.getStringIndex()];
return addString(u8.getValue());
}
case Constants.CONSTANT_Class: {
ConstantClass s = (ConstantClass) c;
ConstantUtf8 u8 = (ConstantUtf8) constants[s.getNameIndex()];
return addClass(u8.getValue());
}
case Constants.CONSTANT_NameAndType: {
ConstantNameAndType n = (ConstantNameAndType) c;
ConstantUtf8 u8 = (ConstantUtf8) constants[n.getNameIndex()];
ConstantUtf8 u8_2 = (ConstantUtf8) constants[n.getSignatureIndex()];
return addNameAndType(u8.getValue(), u8_2.getValue());
}
case Constants.CONSTANT_InvokeDynamic: {
ConstantInvokeDynamic cid = (ConstantInvokeDynamic)c;
int index1 = cid.getBootstrapMethodAttrIndex();
ConstantNameAndType cnat = (ConstantNameAndType)constants[cid.getNameAndTypeIndex()];
ConstantUtf8 name = (ConstantUtf8) constants[cnat.getNameIndex()];
ConstantUtf8 signature = (ConstantUtf8) constants[cnat.getSignatureIndex()];
int index2 = addNameAndType(name.getValue(), signature.getValue());
return addInvokeDynamic(index1,index2);
}
case Constants.CONSTANT_MethodHandle:
ConstantMethodHandle cmh = (ConstantMethodHandle)c;
return addMethodHandle(cmh.getReferenceKind(),addConstant(constants[cmh.getReferenceIndex()],cp));
case Constants.CONSTANT_Utf8:
return addUtf8(((ConstantUtf8) c).getValue());
case Constants.CONSTANT_Double:
return addDouble(((ConstantDouble) c).getValue());
case Constants.CONSTANT_Float:
return addFloat(((ConstantFloat) c).getValue());
case Constants.CONSTANT_Long:
return addLong(((ConstantLong) c).getValue());
case Constants.CONSTANT_Integer:
return addInteger(((ConstantInteger) c).getValue());
case Constants.CONSTANT_MethodType:
ConstantMethodType cmt = (ConstantMethodType)c;
return addMethodType(addConstant(constants[cmt.getDescriptorIndex()],cp));
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.getValue().replace('/', '.');
u8 = (ConstantUtf8) constants[n.getNameIndex()];
String name = u8.getValue();
u8 = (ConstantUtf8) constants[n.getSignatureIndex()];
String signature = u8.getValue();
switch (c.getTag()) {
case Constants.CONSTANT_InterfaceMethodref:
return addInterfaceMethodref(class_name, name, signature);
case Constants.CONSTANT_Methodref:
return addMethodref(class_name, name, signature); // OPTIMIZE indicate it should be cached!
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);
}
}
public int addMethodHandle(byte referenceKind, int referenceIndex) {
adjustSize();
int ret = poolSize;
pool[poolSize++] = new ConstantMethodHandle(referenceKind, referenceIndex);
return ret;
}
public int addMethodType(int descriptorIndex) {
adjustSize();
int ret = poolSize;
pool[poolSize++] = new ConstantMethodType(descriptorIndex);
return ret;
}
// OPTIMIZE should put it in the cache now
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 = poolSize;
pool[poolSize++] = new ConstantMethodref(class_index, name_and_type_index);
return ret;
}
public int addInvokeDynamic(int bootstrapMethodIndex, int constantNameAndTypeIndex) {
adjustSize();
int ret = poolSize;
pool[poolSize++] = new ConstantInvokeDynamic(bootstrapMethodIndex, constantNameAndTypeIndex);
return ret;
}
public int addInterfaceMethodref(String class_name, String method_name, String signature) {
int ret = lookupInterfaceMethodref(class_name, method_name, signature);
int class_index, name_and_type_index;
if (ret != -1)
return ret;
adjustSize();
class_index = addClass(class_name);
name_and_type_index = addNameAndType(method_name, signature);
ret = poolSize;
pool[poolSize++] = new ConstantInterfaceMethodref(class_index, name_and_type_index);
return ret;
}
public int lookupInterfaceMethodref(String searchClassname, String searchMethodName, String searchSignature) {
searchClassname = searchClassname.replace('.', '/');
for (int i = 1; i < poolSize; i++) {
Constant c = pool[i];
if (c != null && c.tag == Constants.CONSTANT_InterfaceMethodref) {
ConstantInterfaceMethodref cfr = (ConstantInterfaceMethodref) c;
ConstantClass cc = (ConstantClass) pool[cfr.getClassIndex()];
String cName = ((ConstantUtf8) pool[cc.getNameIndex()]).getValue();
if (!cName.equals(searchClassname))
continue;
// check the name and type
ConstantNameAndType cnat = (ConstantNameAndType) pool[cfr.getNameAndTypeIndex()];
String name = ((ConstantUtf8) pool[cnat.getNameIndex()]).getValue();
if (!name.equals(searchMethodName))
continue; // not this one
String typeSignature = ((ConstantUtf8) pool[cnat.getSignatureIndex()]).getValue();
if (!typeSignature.equals(searchSignature))
continue;
return i;
}
}
return -1;
}
public int lookupMethodref(String searchClassname, String searchMethodName, String searchSignature) {
String key = new StringBuffer().append(searchClassname).append(searchMethodName).append(searchSignature).toString();
Integer cached = methodCache.get(key);
if (cached != null)
return cached.intValue();
searchClassname = searchClassname.replace('.', '/');
for (int i = 1; i < poolSize; i++) {
Constant c = pool[i];
if (c != null && c.tag == Constants.CONSTANT_Methodref) {
ConstantMethodref cfr = (ConstantMethodref) c;
ConstantNameAndType cnat = (ConstantNameAndType) pool[cfr.getNameAndTypeIndex()];
// check the class
int cIndex = cfr.getClassIndex();
ConstantClass cc = (ConstantClass) pool[cIndex];
String cName = ((ConstantUtf8) pool[cc.getNameIndex()]).getValue();
if (!cName.equals(searchClassname))
continue;
// check the name and type
String name = ((ConstantUtf8) pool[cnat.getNameIndex()]).getValue();
if (!name.equals(searchMethodName))
continue; // not this one
String typeSignature = ((ConstantUtf8) pool[cnat.getSignatureIndex()]).getValue();
if (!typeSignature.equals(searchSignature))
continue;
methodCache.put(key, new Integer(i));
return i;
}
}
return -1;
}
public ConstantPool getFinalConstantPool() {
Constant[] cs = new Constant[poolSize]; // create it the exact size we need
System.arraycopy(pool, 0, cs, 0, poolSize);
return new ConstantPool(cs);
}
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