asm4/src/org/objectweb/asm/optimizer/Constant.java - toolchain/jill - Git at Google

 /***
  * 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.objectweb.asm.optimizer;

 import java.util.Arrays;

 import org.objectweb.asm.ClassWriter;
 import org.objectweb.asm.Handle;

 /**
  * A constant pool item.
  *
  * @author Eric Bruneton
  */
 class Constant {

     /**
      * Type of this constant pool item. A single class is used to represent all
      * constant pool item types, in order to minimize the bytecode size of this
      * package. The value of this field is I, J, F, D, S, s, C, T, G, M, N, y,
      * t, [h..p] (for Constant Integer, Long, Float, Double, STR, UTF8, Class,
      * NameType, Fieldref, Methodref, InterfaceMethodref, InvokeDynamic,
      * MethodType and MethodHandle constant pool items respectively).
      *
      * The 9 variable of MethodHandle constants are stored between h and p.
      */
     char type;

     /**
      * Value of this item, for an integer item.
      */
     int intVal;

     /**
      * Value of this item, for a long item.
      */
     long longVal;

     /**
      * Value of this item, for a float item.
      */
     float floatVal;

     /**
      * Value of this item, for a double item.
      */
     double doubleVal;

     /**
      * First part of the value of this item, for items that do not hold a
      * primitive value.
      */
     String strVal1;

     /**
      * Second part of the value of this item, for items that do not hold a
      * primitive value.
      */
     String strVal2;

     /**
      * Third part of the value of this item, for items that do not hold a
      * primitive value.
      */
     Object objVal3;

     /**
      * InvokeDynamic's constant values.
      */
     Object[] objVals;

     /**
      * The hash code value of this constant pool item.
      */
     int hashCode;

     Constant() {
     }

     Constant(final Constant i) {
         type = i.type;
         intVal = i.intVal;
         longVal = i.longVal;
         floatVal = i.floatVal;
         doubleVal = i.doubleVal;
         strVal1 = i.strVal1;
         strVal2 = i.strVal2;
         objVal3 = i.objVal3;
         objVals = i.objVals;
         hashCode = i.hashCode;
     }

     /**
      * Sets this item to an integer item.
      *
      * @param intVal
      *            the value of this item.
      */
     void set(final int intVal) {
         this.type = 'I';
         this.intVal = intVal;
         this.hashCode = 0x7FFFFFFF & (type + intVal);
     }

     /**
      * Sets this item to a long item.
      *
      * @param longVal
      *            the value of this item.
      */
     void set(final long longVal) {
         this.type = 'J';
         this.longVal = longVal;
         this.hashCode = 0x7FFFFFFF & (type + (int) longVal);
     }

     /**
      * Sets this item to a float item.
      *
      * @param floatVal
      *            the value of this item.
      */
     void set(final float floatVal) {
         this.type = 'F';
         this.floatVal = floatVal;
         this.hashCode = 0x7FFFFFFF & (type + (int) floatVal);
     }

     /**
      * Sets this item to a double item.
      *
      * @param doubleVal
      *            the value of this item.
      */
     void set(final double doubleVal) {
         this.type = 'D';
         this.doubleVal = doubleVal;
         this.hashCode = 0x7FFFFFFF & (type + (int) doubleVal);
     }

     /**
      * Sets this item to an item that do not hold a primitive value.
      *
      * @param type
      *            the type of this item.
      * @param strVal1
      *            first part of the value of this item.
      * @param strVal2
      *            second part of the value of this item.
      * @param strVal3
      *            third part of the value of this item.
      */
     void set(final char type, final String strVal1, final String strVal2,
             final String strVal3) {
         this.type = type;
         this.strVal1 = strVal1;
         this.strVal2 = strVal2;
         this.objVal3 = strVal3;
         switch (type) {
         case 's':
         case 'S':
         case 'C':
         case 't':
             hashCode = 0x7FFFFFFF & (type + strVal1.hashCode());
             return;
         case 'T':
             hashCode = 0x7FFFFFFF & (type + strVal1.hashCode()
                     * strVal2.hashCode());
             return;
             // case 'G':
             // case 'M':
             // case 'N':
             // case 'h' ... 'p':
         default:
             hashCode = 0x7FFFFFFF & (type + strVal1.hashCode()
                     * strVal2.hashCode() * strVal3.hashCode());
         }
     }

     /**
      * Set this item to an InvokeDynamic item.
      *
      * @param name
      *            invokedynamic's name.
      * @param desc
      *            invokedynamic's descriptor.
      * @param bsm
      *            bootstrap method.
      * @param bsmArgs
      *            bootstrap method constant arguments.
      */
     void set(final String name, final String desc, final Handle bsm,
             final Object[] bsmArgs) {
         this.type = 'y';
         this.strVal1 = name;
         this.strVal2 = desc;
         this.objVal3 = bsm;
         this.objVals = bsmArgs;

         int hashCode = 'y' + name.hashCode() * desc.hashCode() * bsm.hashCode();
         for (int i = 0; i < bsmArgs.length; i++) {
             hashCode *= bsmArgs[i].hashCode();
         }
         this.hashCode = 0x7FFFFFFF & hashCode;
     }

     void write(final ClassWriter cw) {
         switch (type) {
         case 'I':
             cw.newConst(new Integer(intVal));
             break;
         case 'J':
             cw.newConst(new Long(longVal));
             break;
         case 'F':
             cw.newConst(new Float(floatVal));
             break;
         case 'D':
             cw.newConst(new Double(doubleVal));
             break;
         case 'S':
             cw.newConst(strVal1);
             break;
         case 's':
             cw.newUTF8(strVal1);
             break;
         case 'C':
             cw.newClass(strVal1);
             break;
         case 'T':
             cw.newNameType(strVal1, strVal2);
             break;
         case 'G':
             cw.newField(strVal1, strVal2, (String) objVal3);
             break;
         case 'M':
             cw.newMethod(strVal1, strVal2, (String) objVal3, false);
             break;
         case 'N':
             cw.newMethod(strVal1, strVal2, (String) objVal3, true);
             break;
         case 'y':
             cw.newInvokeDynamic(strVal1, strVal2, (Handle) objVal3, objVals);
             break;
         case 't':
             cw.newMethodType(strVal1);
             break;
         default: // 'h' ... 'p': handle
             cw.newHandle(type - 'h' + 1, strVal1, strVal2, (String) objVal3);
         }
     }

     @Override
     public boolean equals(final Object o) {
         if (!(o instanceof Constant)) {
             return false;
         }
         Constant c = (Constant) o;
         if (c.type == type) {
             switch (type) {
             case 'I':
                 return c.intVal == intVal;
             case 'J':
                 return c.longVal == longVal;
             case 'F':
                 return Float.compare(c.floatVal, floatVal) == 0;
             case 'D':
                 return Double.compare(c.doubleVal, doubleVal) == 0;
             case 's':
             case 'S':
             case 'C':
             case 't':
                 return c.strVal1.equals(strVal1);
             case 'T':
                 return c.strVal1.equals(strVal1) && c.strVal2.equals(strVal2);
             case 'y':
                 return c.strVal1.equals(strVal1) && c.strVal2.equals(strVal2)
                         && c.objVal3.equals(objVal3)
                         && Arrays.equals(c.objVals, objVals);
                 // case 'G':
                 // case 'M':
                 // case 'N':
                 // case 'h' ... 'p':
             default:
                 return c.strVal1.equals(strVal1) && c.strVal2.equals(strVal2)
                         && c.objVal3.equals(objVal3);
             }
         }
         return false;
     }

     @Override
     public int hashCode() {
         return hashCode;
     }
 }
	/***
	* 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.objectweb.asm.optimizer;

	import java.util.Arrays;

	import org.objectweb.asm.ClassWriter;
	import org.objectweb.asm.Handle;

	/**
	* A constant pool item.
	*
	* @author Eric Bruneton
	*/
	class Constant {

	/**
	* Type of this constant pool item. A single class is used to represent all
	* constant pool item types, in order to minimize the bytecode size of this
	* package. The value of this field is I, J, F, D, S, s, C, T, G, M, N, y,
	* t, [h..p] (for Constant Integer, Long, Float, Double, STR, UTF8, Class,
	* NameType, Fieldref, Methodref, InterfaceMethodref, InvokeDynamic,
	* MethodType and MethodHandle constant pool items respectively).
	*
	* The 9 variable of MethodHandle constants are stored between h and p.
	*/
	char type;

	/**
	* Value of this item, for an integer item.
	*/
	int intVal;

	/**
	* Value of this item, for a long item.
	*/
	long longVal;

	/**
	* Value of this item, for a float item.
	*/
	float floatVal;

	/**
	* Value of this item, for a double item.
	*/
	double doubleVal;

	/**
	* First part of the value of this item, for items that do not hold a
	* primitive value.
	*/
	String strVal1;

	/**
	* Second part of the value of this item, for items that do not hold a
	* primitive value.
	*/
	String strVal2;

	/**
	* Third part of the value of this item, for items that do not hold a
	* primitive value.
	*/
	Object objVal3;

	/**
	* InvokeDynamic's constant values.
	*/
	Object[] objVals;

	/**
	* The hash code value of this constant pool item.
	*/
	int hashCode;

	Constant() {
	}

	Constant(final Constant i) {
	type = i.type;
	intVal = i.intVal;
	longVal = i.longVal;
	floatVal = i.floatVal;
	doubleVal = i.doubleVal;
	strVal1 = i.strVal1;
	strVal2 = i.strVal2;
	objVal3 = i.objVal3;
	objVals = i.objVals;
	hashCode = i.hashCode;
	}

	/**
	* Sets this item to an integer item.
	*
	* @param intVal
	* the value of this item.
	*/
	void set(final int intVal) {
	this.type = 'I';
	this.intVal = intVal;
	this.hashCode = 0x7FFFFFFF & (type + intVal);
	}

	/**
	* Sets this item to a long item.
	*
	* @param longVal
	* the value of this item.
	*/
	void set(final long longVal) {
	this.type = 'J';
	this.longVal = longVal;
	this.hashCode = 0x7FFFFFFF & (type + (int) longVal);
	}

	/**
	* Sets this item to a float item.
	*
	* @param floatVal
	* the value of this item.
	*/
	void set(final float floatVal) {
	this.type = 'F';
	this.floatVal = floatVal;
	this.hashCode = 0x7FFFFFFF & (type + (int) floatVal);
	}

	/**
	* Sets this item to a double item.
	*
	* @param doubleVal
	* the value of this item.
	*/
	void set(final double doubleVal) {
	this.type = 'D';
	this.doubleVal = doubleVal;
	this.hashCode = 0x7FFFFFFF & (type + (int) doubleVal);
	}

	/**
	* Sets this item to an item that do not hold a primitive value.
	*
	* @param type
	* the type of this item.
	* @param strVal1
	* first part of the value of this item.
	* @param strVal2
	* second part of the value of this item.
	* @param strVal3
	* third part of the value of this item.
	*/
	void set(final char type, final String strVal1, final String strVal2,
	final String strVal3) {
	this.type = type;
	this.strVal1 = strVal1;
	this.strVal2 = strVal2;
	this.objVal3 = strVal3;
	switch (type) {
	case 's':
	case 'S':
	case 'C':
	case 't':
	hashCode = 0x7FFFFFFF & (type + strVal1.hashCode());
	return;
	case 'T':
	hashCode = 0x7FFFFFFF & (type + strVal1.hashCode()
	* strVal2.hashCode());
	return;
	// case 'G':
	// case 'M':
	// case 'N':
	// case 'h' ... 'p':
	default:
	hashCode = 0x7FFFFFFF & (type + strVal1.hashCode()
	* strVal2.hashCode() * strVal3.hashCode());
	}
	}

	/**
	* Set this item to an InvokeDynamic item.
	*
	* @param name
	* invokedynamic's name.
	* @param desc
	* invokedynamic's descriptor.
	* @param bsm
	* bootstrap method.
	* @param bsmArgs
	* bootstrap method constant arguments.
	*/
	void set(final String name, final String desc, final Handle bsm,
	final Object[] bsmArgs) {
	this.type = 'y';
	this.strVal1 = name;
	this.strVal2 = desc;
	this.objVal3 = bsm;
	this.objVals = bsmArgs;

	int hashCode = 'y' + name.hashCode() * desc.hashCode() * bsm.hashCode();
	for (int i = 0; i < bsmArgs.length; i++) {
	hashCode *= bsmArgs[i].hashCode();
	}
	this.hashCode = 0x7FFFFFFF & hashCode;
	}

	void write(final ClassWriter cw) {
	switch (type) {
	case 'I':
	cw.newConst(new Integer(intVal));
	break;
	case 'J':
	cw.newConst(new Long(longVal));
	break;
	case 'F':
	cw.newConst(new Float(floatVal));
	break;
	case 'D':
	cw.newConst(new Double(doubleVal));
	break;
	case 'S':
	cw.newConst(strVal1);
	break;
	case 's':
	cw.newUTF8(strVal1);
	break;
	case 'C':
	cw.newClass(strVal1);
	break;
	case 'T':
	cw.newNameType(strVal1, strVal2);
	break;
	case 'G':
	cw.newField(strVal1, strVal2, (String) objVal3);
	break;
	case 'M':
	cw.newMethod(strVal1, strVal2, (String) objVal3, false);
	break;
	case 'N':
	cw.newMethod(strVal1, strVal2, (String) objVal3, true);
	break;
	case 'y':
	cw.newInvokeDynamic(strVal1, strVal2, (Handle) objVal3, objVals);
	break;
	case 't':
	cw.newMethodType(strVal1);
	break;
	default: // 'h' ... 'p': handle
	cw.newHandle(type - 'h' + 1, strVal1, strVal2, (String) objVal3);
	}
	}

	@Override
	public boolean equals(final Object o) {
	if (!(o instanceof Constant)) {
	return false;
	}
	Constant c = (Constant) o;
	if (c.type == type) {
	switch (type) {
	case 'I':
	return c.intVal == intVal;
	case 'J':
	return c.longVal == longVal;
	case 'F':
	return Float.compare(c.floatVal, floatVal) == 0;
	case 'D':
	return Double.compare(c.doubleVal, doubleVal) == 0;
	case 's':
	case 'S':
	case 'C':
	case 't':
	return c.strVal1.equals(strVal1);
	case 'T':
	return c.strVal1.equals(strVal1) && c.strVal2.equals(strVal2);
	case 'y':
	return c.strVal1.equals(strVal1) && c.strVal2.equals(strVal2)
	&& c.objVal3.equals(objVal3)
	&& Arrays.equals(c.objVals, objVals);
	// case 'G':
	// case 'M':
	// case 'N':
	// case 'h' ... 'p':
	default:
	return c.strVal1.equals(strVal1) && c.strVal2.equals(strVal2)
	&& c.objVal3.equals(objVal3);
	}
	}
	return false;
	}

	@Override
	public int hashCode() {
	return hashCode;
	}
	}