Java/clojure-type.java at main · Eggy115/Java · GitHub

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/***

* ASM: a very small and fast Java bytecode manipulation framework

* 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 clojure.asm;

import java.lang.reflect.Constructor;

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

* @author Chris Nokleberg

public class Type{

/**

* The sort of the <tt>void</tt> type. See {@link #getSort getSort}.

public final static int VOID = 0;

/**

* The sort of the <tt>boolean</tt> type. See {@link #getSort getSort}.

public final static int BOOLEAN = 1;

/**

* The sort of the <tt>char</tt> type. See {@link #getSort getSort}.

public final static int CHAR = 2;

/**

* The sort of the <tt>byte</tt> type. See {@link #getSort getSort}.

public final static int BYTE = 3;

/**

* The sort of the <tt>short</tt> type. See {@link #getSort getSort}.

public final static int SHORT = 4;

/**

* The sort of the <tt>int</tt> type. See {@link #getSort getSort}.

public final static int INT = 5;

/**

* The sort of the <tt>float</tt> type. See {@link #getSort getSort}.

public final static int FLOAT = 6;

/**

* The sort of the <tt>long</tt> type. See {@link #getSort getSort}.

public final static int LONG = 7;

/**

* The sort of the <tt>double</tt> 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 <tt>void</tt> type.

public final static Type VOID_TYPE = new Type(VOID);

/**

* The <tt>boolean</tt> type.

public final static Type BOOLEAN_TYPE = new Type(BOOLEAN);

/**

* The <tt>char</tt> type.

public final static Type CHAR_TYPE = new Type(CHAR);

/**

* The <tt>byte</tt> type.

public final static Type BYTE_TYPE = new Type(BYTE);

/**

* The <tt>short</tt> type.

public final static Type SHORT_TYPE = new Type(SHORT);

/**

* The <tt>int</tt> type.

public final static Type INT_TYPE = new Type(INT);

/**

* The <tt>float</tt> type.

public final static Type FLOAT_TYPE = new Type(FLOAT);

/**

* The <tt>long</tt> type.

public final static Type LONG_TYPE = new Type(LONG);

/**

* The <tt>double</tt> 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 {@link Type#OBJECT} type for the given internal class name.

* This is a shortcut method for <code>Type.getType("L"+name+";")</code>.

* <i>Note that opposed to {@link Type#getType(String)}, this method takes

* internal class names and not class descriptor.</i>

* @param name an internal class name.

* @return the the {@link Type#OBJECT} type for the given class name.

public static Type getObjectType(String name){

int l = name.length();

char[] buf = new char[l + 2];

buf[0] = 'L';

buf[l + 1] = ';';

name.getChars(0, l, buf, 1);

return new Type(OBJECT, buf, 0, l + 2);

}

/**

* 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 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();

StringBuffer buf = new StringBuffer();

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();

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 <tt>long</tt> and

* <tt>double</tt>, 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 <tt>float</tt> and

* <tt>opcode</tt> is IRETURN, this method returns FRETURN.

public int getOpcode(final int opcode){

if(opcode == Opcodes.IALOAD || opcode == Opcodes.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 <tt>true</tt> if the given object is equal to this type.

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 == 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();

}

Java/clojure-type.java at main · Eggy115/Java · GitHub

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