org.objectweb.asm.optimizer.Constant Maven / Gradle / Ivy
/***
* 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(intVal);
break;
case 'J':
cw.newConst(longVal);
break;
case 'F':
cw.newConst(floatVal);
break;
case 'D':
cw.newConst(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;
}
}
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