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/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000,2002,2003 INRIA, France Telecom
* 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. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS 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 COPYRIGHT OWNER OR 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.
*/
package oracle.toplink.libraries.asm;
import java.lang.reflect.Method;
/**
* A Java type. This class can be used to make it easier to manipulate type
* and method descriptors.
*
* @author Eric Bruneton, Chris Nokleberg
*/
public class Type {
/**
* The sort of the void type. See {@link #getSort getSort}.
*/
public final static int VOID = 0;
/**
* The sort of the boolean type. See {@link #getSort getSort}.
*/
public final static int BOOLEAN = 1;
/**
* The sort of the char type. See {@link #getSort getSort}.
*/
public final static int CHAR = 2;
/**
* The sort of the byte type. See {@link #getSort getSort}.
*/
public final static int BYTE = 3;
/**
* The sort of the short type. See {@link #getSort getSort}.
*/
public final static int SHORT = 4;
/**
* The sort of the int type. See {@link #getSort getSort}.
*/
public final static int INT = 5;
/**
* The sort of the float type. See {@link #getSort getSort}.
*/
public final static int FLOAT = 6;
/**
* The sort of the long type. See {@link #getSort getSort}.
*/
public final static int LONG = 7;
/**
* The sort of the double type. See {@link #getSort getSort}.
*/
public final static int DOUBLE = 8;
/**
* The sort of array reference types. See {@link #getSort getSort}.
*/
public final static int ARRAY = 9;
/**
* The sort of object reference type. See {@link #getSort getSort}.
*/
public final static int OBJECT = 10;
/**
* The void type.
*/
public final static Type VOID_TYPE = new Type(VOID);
/**
* The boolean type.
*/
public final static Type BOOLEAN_TYPE = new Type(BOOLEAN);
/**
* The char type.
*/
public final static Type CHAR_TYPE = new Type(CHAR);
/**
* The byte type.
*/
public final static Type BYTE_TYPE = new Type(BYTE);
/**
* The short type.
*/
public final static Type SHORT_TYPE = new Type(SHORT);
/**
* The int type.
*/
public final static Type INT_TYPE = new Type(INT);
/**
* The float type.
*/
public final static Type FLOAT_TYPE = new Type(FLOAT);
/**
* The long type.
*/
public final static Type LONG_TYPE = new Type(LONG);
/**
* The double type.
*/
public final static Type DOUBLE_TYPE = new Type(DOUBLE);
// --------------------------------------------------------------------------
// Fields
// --------------------------------------------------------------------------
/**
* The sort of this Java type.
*/
private final int sort;
/**
* A buffer containing the descriptor of this Java type.
* This field is only used for reference types.
*/
private char[] buf;
/**
* The offset of the descriptor of this Java type in {@link #buf buf}.
* This field is only used for reference types.
*/
private int off;
/**
* The length of the descriptor of this Java type.
*/
private int len;
// --------------------------------------------------------------------------
// Constructors
// --------------------------------------------------------------------------
/**
* Constructs a primitive type.
*
* @param sort the sort of the primitive type to be constructed.
*/
private Type (final int sort) {
this.sort = sort;
this.len = 1;
}
/**
* Constructs a reference type.
*
* @param sort the sort of the reference type to be constructed.
* @param buf a buffer containing the descriptor of the previous type.
* @param off the offset of this descriptor in the previous buffer.
* @param len the length of this descriptor.
*/
private Type (
final int sort,
final char[] buf,
final int off,
final int len)
{
this.sort = sort;
this.buf = buf;
this.off = off;
this.len = len;
}
/**
* Returns the Java type corresponding to the given type descriptor.
*
* @param typeDescriptor a type descriptor.
* @return the Java type corresponding to the given type descriptor.
*/
public static Type getType (final String typeDescriptor) {
return getType(typeDescriptor.toCharArray(), 0);
}
/**
* Returns the Java type corresponding to the given class.
*
* @param c a class.
* @return the Java type corresponding to the given class.
*/
public static Type getType (final Class c) {
if (c.isPrimitive()) {
if (c == Integer.TYPE) {
return INT_TYPE;
} else if (c == Void.TYPE) {
return VOID_TYPE;
} else if (c == Boolean.TYPE) {
return BOOLEAN_TYPE;
} else if (c == Byte.TYPE) {
return BYTE_TYPE;
} else if (c == Character.TYPE) {
return CHAR_TYPE;
} else if (c == Short.TYPE) {
return SHORT_TYPE;
} else if (c == Double.TYPE) {
return DOUBLE_TYPE;
} else if (c == Float.TYPE) {
return FLOAT_TYPE;
} else /*if (c == Long.TYPE)*/ {
return LONG_TYPE;
}
} else {
return getType(getDescriptor(c));
}
}
/**
* Returns the Java types corresponding to the argument types of the given
* method descriptor.
*
* @param methodDescriptor a method descriptor.
* @return the Java types corresponding to the argument types of the given
* method descriptor.
*/
public static Type[] getArgumentTypes (final String methodDescriptor) {
char[] buf = methodDescriptor.toCharArray();
int off = 1;
int size = 0;
while (true) {
char car = buf[off++];
if (car == ')') {
break;
} else if (car == 'L') {
while (buf[off++] != ';') {
}
++size;
} else if (car != '[') {
++size;
}
}
Type[] args = new Type[size];
off = 1;
size = 0;
while (buf[off] != ')') {
args[size] = getType(buf, off);
off += args[size].len;
size += 1;
}
return args;
}
/**
* Returns the Java types corresponding to the argument types of the given
* method.
*
* @param method a method.
* @return the Java types corresponding to the argument types of the given
* method.
*/
public static Type[] getArgumentTypes (final Method method) {
Class[] classes = method.getParameterTypes();
Type[] types = new Type[classes.length];
for (int i = classes.length - 1; i >= 0; --i) {
types[i] = getType(classes[i]);
}
return types;
}
/**
* Returns the Java type corresponding to the return type of the given
* method descriptor.
*
* @param methodDescriptor a method descriptor.
* @return the Java type corresponding to the return type of the given
* method descriptor.
*/
public static Type getReturnType (final String methodDescriptor) {
char[] buf = methodDescriptor.toCharArray();
return getType(buf, methodDescriptor.indexOf(')') + 1);
}
/**
* Returns the Java type corresponding to the return type of the given
* method.
*
* @param method a method.
* @return the Java type corresponding to the return type of the given
* method.
*/
public static Type getReturnType (final Method method) {
return getType(method.getReturnType());
}
/**
* Returns the Java type corresponding to the given type descriptor.
*
* @param buf a buffer containing a type descriptor.
* @param off the offset of this descriptor in the previous buffer.
* @return the Java type corresponding to the given type descriptor.
*/
private static Type getType (final char[] buf, final int off) {
int len;
switch (buf[off]) {
case 'V': return VOID_TYPE;
case 'Z': return BOOLEAN_TYPE;
case 'C': return CHAR_TYPE;
case 'B': return BYTE_TYPE;
case 'S': return SHORT_TYPE;
case 'I': return INT_TYPE;
case 'F': return FLOAT_TYPE;
case 'J': return LONG_TYPE;
case 'D': return DOUBLE_TYPE;
case '[':
len = 1;
while (buf[off + len] == '[') {
++len;
}
if (buf[off + len] == 'L') {
++len;
while (buf[off + len] != ';') {
++len;
}
}
return new Type(ARRAY, buf, off, len + 1);
//case 'L':
default:
len = 1;
while (buf[off + len] != ';') {
++len;
}
return new Type(OBJECT, buf, off, len + 1);
}
}
// --------------------------------------------------------------------------
// Accessors
// --------------------------------------------------------------------------
/**
* Returns the sort of this Java type.
*
* @return {@link #VOID VOID}, {@link #BOOLEAN BOOLEAN}, {@link #CHAR CHAR},
* {@link #BYTE BYTE}, {@link #SHORT SHORT}, {@link #INT INT}, {@link
* #FLOAT FLOAT}, {@link #LONG LONG}, {@link #DOUBLE DOUBLE}, {@link
* #ARRAY ARRAY} or {@link #OBJECT OBJECT}.
*/
public int getSort () {
return sort;
}
/**
* Returns the number of dimensions of this array type.
* This method should only be used for an array type.
*
* @return the number of dimensions of this array type.
*/
public int getDimensions () {
int i = 1;
while (buf[off + i] == '[') {
++i;
}
return i;
}
/**
* Returns the type of the elements of this array type.
* This method should only be used for an array type.
*
* @return Returns the type of the elements of this array type.
*/
public Type getElementType () {
return getType(buf, off + getDimensions());
}
/**
* Returns the name of the class corresponding to this type.
*
* @return the fully qualified name of the class corresponding to this type.
*/
public String getClassName () {
switch (sort) {
case VOID: return "void";
case BOOLEAN: return "boolean";
case CHAR: return "char";
case BYTE: return "byte";
case SHORT: return "short";
case INT: return "int";
case FLOAT: return "float";
case LONG: return "long";
case DOUBLE: return "double";
case ARRAY:
StringBuffer b = new StringBuffer(getElementType().getClassName());
for (int i = getDimensions(); i > 0; --i) {
b.append("[]");
}
return b.toString();
//case OBJECT:
default:
return new String(buf, off + 1, len - 2).replace('/', '.');
}
}
/**
* Returns the internal name of the class corresponding to this object type.
* The internal name of a class is its fully qualified name, where '.' are
* replaced by '/'. This method should only be used for an object type.
*
* @return the internal name of the class corresponding to this object type.
*/
public String getInternalName () {
return new String(buf, off + 1, len - 2);
}
// --------------------------------------------------------------------------
// Conversion to type descriptors
// --------------------------------------------------------------------------
/**
* Returns the descriptor corresponding to this Java type.
*
* @return the descriptor corresponding to this Java type.
*/
public String getDescriptor () {
StringBuffer buf = new StringBuffer();
getDescriptor(buf);
return buf.toString();
}
/**
* Returns the descriptor corresponding to the given argument and return
* types.
*
* @param returnType the return type of the method.
* @param argumentTypes the argument types of the method.
* @return the descriptor corresponding to the given argument and return
* types.
*/
public static String getMethodDescriptor (
final Type returnType,
final Type[] argumentTypes)
{
StringBuffer buf = new StringBuffer();
buf.append('(');
for (int i = 0; i < argumentTypes.length; ++i) {
argumentTypes[i].getDescriptor(buf);
}
buf.append(')');
returnType.getDescriptor(buf);
return buf.toString();
}
/**
* Appends the descriptor corresponding to this Java type to the given string
* buffer.
*
* @param buf the string buffer to which the descriptor must be appended.
*/
private void getDescriptor (final StringBuffer buf) {
switch (sort) {
case VOID: buf.append('V'); return;
case BOOLEAN: buf.append('Z'); return;
case CHAR: buf.append('C'); return;
case BYTE: buf.append('B'); return;
case SHORT: buf.append('S'); return;
case INT: buf.append('I'); return;
case FLOAT: buf.append('F'); return;
case LONG: buf.append('J'); return;
case DOUBLE: buf.append('D'); return;
//case ARRAY:
//case OBJECT:
default: buf.append(this.buf, off, len);
}
}
// --------------------------------------------------------------------------
// Direct conversion from classes to type descriptors,
// without intermediate Type objects
// --------------------------------------------------------------------------
/**
* Returns the internal name of the given class. The internal name of a class
* is its fully qualified name, where '.' are replaced by '/'.
*
* @param c an object class.
* @return the internal name of the given class.
*/
public static String getInternalName (final Class c) {
return c.getName().replace('.', '/');
}
/**
* Returns the descriptor corresponding to the given Java type.
*
* @param c an object class, a primitive class or an array class.
* @return the descriptor corresponding to the given class.
*/
public static String getDescriptor (final Class c) {
StringBuffer buf = new StringBuffer();
getDescriptor(buf, c);
return buf.toString();
}
/**
* Returns the descriptor corresponding to the given method.
*
* @param m a {@link Method Method} object.
* @return the descriptor of the given method.
*/
public static String getMethodDescriptor (final Method m) {
Class[] parameters = m.getParameterTypes();
StringBuffer buf = new StringBuffer();
buf.append('(');
for (int i = 0; i < parameters.length; ++i) {
getDescriptor(buf, parameters[i]);
}
buf.append(')');
getDescriptor(buf, m.getReturnType());
return buf.toString();
}
/**
* Appends the descriptor of the given class to the given string buffer.
*
* @param buf the string buffer to which the descriptor must be appended.
* @param c the class whose descriptor must be computed.
*/
private static void getDescriptor (final StringBuffer buf, final Class c) {
Class d = c;
while (true) {
if (d.isPrimitive()) {
char car;
if (d == Integer.TYPE) {
car = 'I';
} else if (d == Void.TYPE) {
car = 'V';
} else if (d == Boolean.TYPE) {
car = 'Z';
} else if (d == Byte.TYPE) {
car = 'B';
} else if (d == Character.TYPE) {
car = 'C';
} else if (d == Short.TYPE) {
car = 'S';
} else if (d == Double.TYPE) {
car = 'D';
} else if (d == Float.TYPE) {
car = 'F';
} else /*if (d == Long.TYPE)*/ {
car = 'J';
}
buf.append(car);
return;
} else if (d.isArray()) {
buf.append('[');
d = d.getComponentType();
} else {
buf.append('L');
String name = d.getName();
int len = name.length();
for (int i = 0; i < len; ++i) {
char car = name.charAt(i);
buf.append(car == '.' ? '/' : car);
}
buf.append(';');
return;
}
}
}
// --------------------------------------------------------------------------
// Corresponding size and opcodes
// --------------------------------------------------------------------------
/**
* Returns the size of values of this type.
*
* @return the size of values of this type, i.e., 2 for long and
* double, and 1 otherwise.
*/
public int getSize () {
return (sort == LONG || sort == DOUBLE ? 2 : 1);
}
/**
* Returns a JVM instruction opcode adapted to this Java type.
*
* @param opcode a JVM instruction opcode. This opcode must be one of ILOAD,
* ISTORE, IALOAD, IASTORE, IADD, ISUB, IMUL, IDIV, IREM, INEG, ISHL,
* ISHR, IUSHR, IAND, IOR, IXOR and IRETURN.
* @return an opcode that is similar to the given opcode, but adapted to this
* Java type. For example, if this type is float and
* opcode is IRETURN, this method returns FRETURN.
*/
public int getOpcode (final int opcode) {
if (opcode == Constants.IALOAD || opcode == Constants.IASTORE) {
switch (sort) {
case BOOLEAN:
case BYTE:
return opcode + 5;
case CHAR:
return opcode + 6;
case SHORT:
return opcode + 7;
case INT:
return opcode;
case FLOAT:
return opcode + 2;
case LONG:
return opcode + 1;
case DOUBLE:
return opcode + 3;
//case ARRAY:
//case OBJECT:
default:
return opcode + 4;
}
} else {
switch (sort) {
case VOID:
return opcode + 5;
case BOOLEAN:
case CHAR:
case BYTE:
case SHORT:
case INT:
return opcode;
case FLOAT:
return opcode + 2;
case LONG:
return opcode + 1;
case DOUBLE:
return opcode + 3;
//case ARRAY:
//case OBJECT:
default:
return opcode + 4;
}
}
}
// --------------------------------------------------------------------------
// Equals, hashCode and toString
// --------------------------------------------------------------------------
/**
* Tests if the given object is equal to this type.
*
* @param o the object to be compared to this type.
* @return true if the given object is equal to this type.
*/
public boolean equals (final Object o) {
if (this == o) {
return true;
}
if (o == null || !(o instanceof Type)) {
return false;
}
Type t = (Type)o;
if (sort != t.sort) {
return false;
}
if (sort == Type.OBJECT || sort == Type.ARRAY) {
if (len != t.len) {
return false;
}
for (int i = off, j = t.off, end = i + len; i < end; i++, j++) {
if (buf[i] != t.buf[j]) {
return false;
}
}
}
return true;
}
/**
* Returns a hash code value for this type.
*
* @return a hash code value for this type.
*/
public int hashCode () {
int hc = 13 * sort;
if (sort == Type.OBJECT || sort == Type.ARRAY) {
for (int i = off, end = i + len; i < end; i++) {
hc = 17 * (hc + buf[i]);
}
}
return hc;
}
/**
* Returns a string representation of this type.
*
* @return the descriptor of this type.
*/
public String toString () {
return getDescriptor();
}
}
