/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2007 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.zbus.common.json.asm;
/**
* 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 static final int VOID = 0;
/**
* The sort of the <tt>boolean</tt> type. See {@link #getSort getSort}.
*/
public static final int BOOLEAN = 1;
/**
* The sort of the <tt>char</tt> type. See {@link #getSort getSort}.
*/
public static final int CHAR = 2;
/**
* The sort of the <tt>byte</tt> type. See {@link #getSort getSort}.
*/
public static final int BYTE = 3;
/**
* The sort of the <tt>short</tt> type. See {@link #getSort getSort}.
*/
public static final int SHORT = 4;
/**
* The sort of the <tt>int</tt> type. See {@link #getSort getSort}.
*/
public static final int INT = 5;
/**
* The sort of the <tt>float</tt> type. See {@link #getSort getSort}.
*/
public static final int FLOAT = 6;
/**
* The sort of the <tt>long</tt> type. See {@link #getSort getSort}.
*/
public static final int LONG = 7;
/**
* The sort of the <tt>double</tt> 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 type. See {@link #getSort getSort}.
*/
public static final int OBJECT = 10;
/**
* The <tt>void</tt> type.
*/
public static final Type VOID_TYPE = new Type(VOID, null, ('V' << 24) | (5 << 16) | (0 << 8) | 0, 1);
/**
* The <tt>boolean</tt> type.
*/
public static final Type BOOLEAN_TYPE = new Type(BOOLEAN, null, ('Z' << 24) | (0 << 16) | (5 << 8) | 1, 1);
/**
* The <tt>char</tt> type.
*/
public static final Type CHAR_TYPE = new Type(CHAR, null, ('C' << 24) | (0 << 16) | (6 << 8) | 1, 1);
/**
* The <tt>byte</tt> type.
*/
public static final Type BYTE_TYPE = new Type(BYTE, null, ('B' << 24) | (0 << 16) | (5 << 8) | 1, 1);
/**
* The <tt>short</tt> type.
*/
public static final Type SHORT_TYPE = new Type(SHORT, null, ('S' << 24) | (0 << 16) | (7 << 8) | 1, 1);
/**
* The <tt>int</tt> type.
*/
public static final Type INT_TYPE = new Type(INT, null, ('I' << 24) | (0 << 16) | (0 << 8) | 1, 1);
/**
* The <tt>float</tt> type.
*/
public static final Type FLOAT_TYPE = new Type(FLOAT, null, ('F' << 24) | (2 << 16) | (2 << 8) | 1, 1);
/**
* The <tt>long</tt> type.
*/
public static final Type LONG_TYPE = new Type(LONG, null, ('J' << 24) | (1 << 16) | (1 << 8) | 2, 1);
/**
* The <tt>double</tt> 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 type descriptor.
* @return the Java type corresponding to the given type descriptor.
*/
public static Type getType(final String typeDescriptor) {
return getType(typeDescriptor.toCharArray(), 0);
}
/**
* 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 = <tt>(argSize << 2) | retSize</tt> (argSize is
* therefore equal to <tt>i >> 2</tt>, and retSize to <tt>i & 0x03</tt>).
*/
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.
*
* @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 + 1, 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 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);
}
// ------------------------------------------------------------------------
// Conversion to type descriptors
// ------------------------------------------------------------------------
/**
* Returns the descriptor corresponding to this Java type.
*
* @return the descriptor corresponding to this Java type.
*/
String getDescriptor() {
return new String(this.buf, off, len);
}
}