/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Eclipse Public License (EPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/eclipse-1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.jikesrvm.compilers.baseline;
/**
* A set of constants that define some useful Java types and stack
* sizes that describe the state of a basic block and its stack
* contents on entry.
*/
public interface BBConstants {
// first two bits determine the number of Java words making up the
// entity
byte LENGTH_MASK = 0x03;
byte VOID_TYPE = 0x00;
byte INT_TYPE = 0x01;
byte ADDRESS_TYPE = 0x02;
byte LONG_TYPE = 0x04;
byte FLOAT_TYPE = 0x08;
byte DOUBLE_TYPE = 0x10;
byte LONGHALF_TYPE = 0x20;
short DUMMYBLOCK = -1;
short STARTBLOCK = 1;
short EXITBLOCK = 2;
short EXCEPTIONHANDLER = -2;
byte TARGET_ = 0x10;
byte CONDITIONAL_ = 0x20;
byte FALLTHRU_ = 0x40;
byte TRYSTART_ = (byte) 0x80;
byte NOTBLOCK = 0x0;
byte INJSR_ = 0x1;
byte JSRENTRY = 0x2;
byte TRYHANDLERSTART = 0x4;
byte HASHANDLER_ = 0x8;
byte METHODENTRY = TARGET_;
byte CONDITIONALTARGET = TARGET_ | CONDITIONAL_;
byte UNCONDITIONALTARGET = TARGET_;
byte FALLTHRUTARGET = TARGET_ | CONDITIONAL_ | FALLTHRU_;
}