103 lines
2.7 KiB
Java
103 lines
2.7 KiB
Java
/*******************************************************************************
|
|
* Copyright (c) 2002,2006 IBM Corporation.
|
|
* All rights reserved. This program and the accompanying materials
|
|
* are made available under the terms of the Eclipse Public License v1.0
|
|
* which accompanies this distribution, and is available at
|
|
* http://www.eclipse.org/legal/epl-v10.html
|
|
*
|
|
* Contributors:
|
|
* IBM Corporation - initial API and implementation
|
|
*******************************************************************************/
|
|
package com.ibm.wala.shrikeBT;
|
|
|
|
/**
|
|
* ShiftInstructions are distinguished from BinaryOpInstructions because most binary operations in the JVM require both parameters
|
|
* to be the same type, but shifts always take one int parameter.
|
|
*/
|
|
public final class ShiftInstruction extends Instruction implements IShiftInstruction {
|
|
protected ShiftInstruction(short opcode) {
|
|
super(opcode);
|
|
}
|
|
|
|
private static final ShiftInstruction[] preallocated = preallocate();
|
|
|
|
private static ShiftInstruction[] preallocate() {
|
|
ShiftInstruction[] r = new ShiftInstruction[OP_lushr - OP_ishl + 1];
|
|
for (int i = 0; i < r.length; i++) {
|
|
r[i] = new ShiftInstruction((short) (i + OP_ishl));
|
|
}
|
|
return r;
|
|
}
|
|
|
|
public static ShiftInstruction make(String type, Operator operator) throws IllegalArgumentException {
|
|
if (operator == null) {
|
|
throw new IllegalArgumentException("operator is null");
|
|
}
|
|
int t = Util.getTypeIndex(type);
|
|
if (t < 0 || t > TYPE_long_index) {
|
|
throw new IllegalArgumentException("Cannot apply shift to type " + type);
|
|
}
|
|
|
|
return preallocated[(operator.ordinal() - Operator.SHL.ordinal()) * 2 + t];
|
|
}
|
|
|
|
@Override
|
|
public boolean equals(Object o) {
|
|
if (o instanceof ShiftInstruction) {
|
|
ShiftInstruction i = (ShiftInstruction) o;
|
|
return i.opcode == opcode;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public Operator getOperator() {
|
|
return Operator.values()[(opcode - OP_ishl) / 2];
|
|
}
|
|
|
|
@Override
|
|
public int hashCode() {
|
|
return opcode;
|
|
}
|
|
|
|
@Override
|
|
public int getPoppedCount() {
|
|
return 2;
|
|
}
|
|
|
|
@Override
|
|
public String getPushedType(String[] types) {
|
|
return getType();
|
|
}
|
|
|
|
@Override
|
|
public byte getPushedWordSize() {
|
|
return Util.getWordSize(getType());
|
|
}
|
|
|
|
@Override
|
|
public String getType() {
|
|
return indexedTypes[(opcode - OP_ishl) & 1];
|
|
}
|
|
|
|
@Override
|
|
public void visit(IInstruction.Visitor v) throws NullPointerException {
|
|
v.visitShift(this);
|
|
}
|
|
|
|
@Override
|
|
public String toString() {
|
|
return "Shift(" + getType() + "," + getOperator() + ")";
|
|
}
|
|
|
|
@Override
|
|
public boolean isPEI() {
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public boolean isUnsigned() {
|
|
return false;
|
|
}
|
|
} |