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/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2011 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 org.springframework.asm;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
/**
* A Java field or method type. This class can be used to make it easier to
* manipulate type and method descriptors.
*
* @author Eric Bruneton
* @author Chris Nokleberg
*/
public class Type {
/**
* The sort of the void type. See {@link #getSort getSort}.
*/
public static final int VOID = 0;
/**
* The sort of the boolean type. See {@link #getSort getSort}.
*/
public static final int BOOLEAN = 1;
/**
* The sort of the char type. See {@link #getSort getSort}.
*/
public static final int CHAR = 2;
/**
* The sort of the byte type. See {@link #getSort getSort}.
*/
public static final int BYTE = 3;
/**
* The sort of the short type. See {@link #getSort getSort}.
*/
public static final int SHORT = 4;
/**
* The sort of the int type. See {@link #getSort getSort}.
*/
public static final int INT = 5;
/**
* The sort of the float type. See {@link #getSort getSort}.
*/
public static final int FLOAT = 6;
/**
* The sort of the long type. See {@link #getSort getSort}.
*/
public static final int LONG = 7;
/**
* The sort of the double type. See {@link #getSort getSort}.
*/
public static final int DOUBLE = 8;
/**
* The sort of array reference types. See {@link #getSort getSort}.
*/
public static final int ARRAY = 9;
/**
* The sort of object reference types. See {@link #getSort getSort}.
*/
public static final int OBJECT = 10;
/**
* The sort of method types. See {@link #getSort getSort}.
*/
public static final int METHOD = 11;
/**
* The void type.
*/
public static final Type VOID_TYPE = new Type(VOID, null, ('V' << 24)
| (5 << 16) | (0 << 8) | 0, 1);
/**
* The boolean type.
*/
public static final Type BOOLEAN_TYPE = new Type(BOOLEAN, null, ('Z' << 24)
| (0 << 16) | (5 << 8) | 1, 1);
/**
* The char type.
*/
public static final Type CHAR_TYPE = new Type(CHAR, null, ('C' << 24)
| (0 << 16) | (6 << 8) | 1, 1);
/**
* The byte type.
*/
public static final Type BYTE_TYPE = new Type(BYTE, null, ('B' << 24)
| (0 << 16) | (5 << 8) | 1, 1);
/**
* The short type.
*/
public static final Type SHORT_TYPE = new Type(SHORT, null, ('S' << 24)
| (0 << 16) | (7 << 8) | 1, 1);
/**
* The int type.
*/
public static final Type INT_TYPE = new Type(INT, null, ('I' << 24)
| (0 << 16) | (0 << 8) | 1, 1);
/**
* The float type.
*/
public static final Type FLOAT_TYPE = new Type(FLOAT, null, ('F' << 24)
| (2 << 16) | (2 << 8) | 1, 1);
/**
* The long type.
*/
public static final Type LONG_TYPE = new Type(LONG, null, ('J' << 24)
| (1 << 16) | (1 << 8) | 2, 1);
/**
* The double type.
*/
public static final Type DOUBLE_TYPE = new Type(DOUBLE, null, ('D' << 24)
| (3 << 16) | (3 << 8) | 2, 1);
// ------------------------------------------------------------------------
// Fields
// ------------------------------------------------------------------------
/**
* The sort of this Java type.
*/
private final int sort;
/**
* A buffer containing the internal name of this Java type. This field is
* only used for reference types.
*/
private final char[] buf;
/**
* The offset of the internal name of this Java type in {@link #buf buf} or,
* for primitive types, the size, descriptor and getOpcode offsets for this
* type (byte 0 contains the size, byte 1 the descriptor, byte 2 the offset
* for IALOAD or IASTORE, byte 3 the offset for all other instructions).
*/
private final int off;
/**
* The length of the internal name of this Java type.
*/
private final int len;
// ------------------------------------------------------------------------
// Constructors
// ------------------------------------------------------------------------
/**
* 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 field or method 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 internal name.
*
* @param internalName
* an internal name.
* @return the Java type corresponding to the given internal name.
*/
public static Type getObjectType(final String internalName) {
char[] buf = internalName.toCharArray();
return new Type(buf[0] == '[' ? ARRAY : OBJECT, buf, 0, buf.length);
}
/**
* Returns the Java type corresponding to the given method descriptor.
* Equivalent to Type.getType(methodDescriptor).
*
* @param methodDescriptor
* a method descriptor.
* @return the Java type corresponding to the given method descriptor.
*/
public static Type getMethodType(final String methodDescriptor) {
return getType(methodDescriptor.toCharArray(), 0);
}
/**
* Returns the Java method type 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 Java type corresponding to the given argument and return
* types.
*/
public static Type getMethodType(final Type returnType,
final Type... argumentTypes) {
return getType(getMethodDescriptor(returnType, argumentTypes));
}
/**
* 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 method type corresponding to the given constructor.
*
* @param c
* a {@link Constructor Constructor} object.
* @return the Java method type corresponding to the given constructor.
*/
public static Type getType(final Constructor c) {
return getType(getConstructorDescriptor(c));
}
/**
* Returns the Java method type corresponding to the given method.
*
* @param m
* a {@link Method Method} object.
* @return the Java method type corresponding to the given method.
*/
public static Type getType(final Method m) {
return getType(getMethodDescriptor(m));
}
/**
* 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 + (args[size].sort == OBJECT ? 2 : 0);
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();
int off = 1;
while (true) {
char car = buf[off++];
if (car == ')') {
return getType(buf, off);
} else if (car == 'L') {
while (buf[off++] != ';') {
}
}
}
}
/**
* 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());
}
/**
* Computes the size of the arguments and of the return value of a method.
*
* @param desc
* the descriptor of a method.
* @return the size of the arguments of the method (plus one for the
* implicit this argument), argSize, and the size of its return
* value, retSize, packed into a single int i =
* (argSize << 2) | retSize (argSize is therefore equal to
* i >> 2, and retSize to i & 0x03).
*/
public static int getArgumentsAndReturnSizes(final String desc) {
int n = 1;
int c = 1;
while (true) {
char car = desc.charAt(c++);
if (car == ')') {
car = desc.charAt(c);
return n << 2
| (car == 'V' ? 0 : (car == 'D' || car == 'J' ? 2 : 1));
} else if (car == 'L') {
while (desc.charAt(c++) != ';') {
}
n += 1;
} else if (car == '[') {
while ((car = desc.charAt(c)) == '[') {
++c;
}
if (car == 'D' || car == 'J') {
n -= 1;
}
} else if (car == 'D' || car == 'J') {
n += 2;
} else {
n += 1;
}
}
}
/**
* Returns the Java type corresponding to the given type descriptor. For
* method descriptors, buf is supposed to contain nothing more than the
* descriptor itself.
*
* @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':
len = 1;
while (buf[off + len] != ';') {
++len;
}
return new Type(OBJECT, buf, off + 1, len - 1);
// case '(':
default:
return new Type(METHOD, buf, off, buf.length - off);
}
}
// ------------------------------------------------------------------------
// 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}, {@link #OBJECT OBJECT} or {@link #METHOD
* METHOD}.
*/
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 binary name of the class corresponding to this type. This
* method must not be used on method types.
*
* @return the binary 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:
StringBuilder sb = new StringBuilder(getElementType().getClassName());
for (int i = getDimensions(); i > 0; --i) {
sb.append("[]");
}
return sb.toString();
case OBJECT:
return new String(buf, off, len).replace('/', '.').intern();
default:
return null;
}
}
/**
* Returns the internal name of the class corresponding to this object or
* array type. The internal name of a class is its fully qualified name (as
* returned by Class.getName(), where '.' are replaced by '/'. This method
* should only be used for an object or array type.
*
* @return the internal name of the class corresponding to this object type.
*/
public String getInternalName() {
return new String(buf, off, len).intern();
}
/**
* Returns the argument types of methods of this type. This method should
* only be used for method types.
*
* @return the argument types of methods of this type.
*/
public Type[] getArgumentTypes() {
return getArgumentTypes(getDescriptor());
}
/**
* Returns the return type of methods of this type. This method should only
* be used for method types.
*
* @return the return type of methods of this type.
*/
public Type getReturnType() {
return getReturnType(getDescriptor());
}
/**
* Returns the size of the arguments and of the return value of methods of
* this type. This method should only be used for method types.
*
* @return the size of the arguments (plus one for the implicit this
* argument), argSize, and the size of the return value, retSize,
* packed into a single
* int i = (argSize << 2) | retSize
* (argSize is therefore equal to i >> 2,
* and retSize to i & 0x03).
*/
public int getArgumentsAndReturnSizes() {
return getArgumentsAndReturnSizes(getDescriptor());
}
// ------------------------------------------------------------------------
// Conversion to type descriptors
// ------------------------------------------------------------------------
/**
* Returns the descriptor corresponding to this Java type.
*
* @return the descriptor corresponding to this Java type.
*/
public String getDescriptor() {
StringBuilder buf = new StringBuilder();
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) {
StringBuilder buf = new StringBuilder();
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 StringBuilder buf) {
if (this.buf == null) {
// descriptor is in byte 3 of 'off' for primitive types (buf ==
// null)
buf.append((char) ((off & 0xFF000000) >>> 24));
} else if (sort == OBJECT) {
buf.append('L');
buf.append(this.buf, off, len);
buf.append(';');
} else { // sort == ARRAY || sort == METHOD
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, as returned by Class.getName(), where
* '.' are replaced by '/'.
*
* @param c
* an object or array 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) {
StringBuilder buf = new StringBuilder();
getDescriptor(buf, c);
return buf.toString();
}
/**
* Returns the descriptor corresponding to the given constructor.
*
* @param c
* a {@link Constructor Constructor} object.
* @return the descriptor of the given constructor.
*/
public static String getConstructorDescriptor(final Constructor c) {
Class[] parameters = c.getParameterTypes();
StringBuilder buf = new StringBuilder();
buf.append('(');
for (int i = 0; i < parameters.length; ++i) {
getDescriptor(buf, parameters[i]);
}
return buf.append(")V").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();
StringBuilder buf = new StringBuilder();
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 StringBuilder 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. This method must not be used for
* method types.
*
* @return the size of values of this type, i.e., 2 for long and
* double, 0 for void and 1 otherwise.
*/
public int getSize() {
// the size is in byte 0 of 'off' for primitive types (buf == null)
return buf == null ? (off & 0xFF) : 1;
}
/**
* Returns a JVM instruction opcode adapted to this Java type. This method
* must not be used for method types.
*
* @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 == Opcodes.IALOAD || opcode == Opcodes.IASTORE) {
// the offset for IALOAD or IASTORE is in byte 1 of 'off' for
// primitive types (buf == null)
return opcode + (buf == null ? (off & 0xFF00) >> 8 : 4);
} else {
// the offset for other instructions is in byte 2 of 'off' for
// primitive types (buf == null)
return opcode + (buf == null ? (off & 0xFF0000) >> 16 : 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.
*/
@Override
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (!(o instanceof Type)) {
return false;
}
Type t = (Type) o;
if (sort != t.sort) {
return false;
}
if (sort >= 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.
*/
@Override
public int hashCode() {
int hc = 13 * sort;
if (sort >= 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.
*/
@Override
public String toString() {
return getDescriptor();
}
}
