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Bytecodes.java
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Bytecodes.java
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/**
* Copyright (c) 2009 Michael Haupt, michael.haupt@hpi.uni-potsdam.de
* Software Architecture Group, Hasso Plattner Institute, Potsdam, Germany
* http://www.hpi.uni-potsdam.de/swa/
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package som.interpreter;
public class Bytecodes
{
// Bytecodes used by the simple object machine
public static final byte halt = 0;
public static final byte dup = 1;
public static final byte push_local = 2;
public static final byte push_argument = 3;
public static final byte push_field = 4;
public static final byte push_block = 5;
public static final byte push_constant = 6;
public static final byte push_global = 7;
public static final byte pop = 8;
public static final byte pop_local = 9;
public static final byte pop_argument = 10;
public static final byte pop_field = 11;
public static final byte send = 12;
public static final byte super_send = 13;
public static final byte return_local = 14;
public static final byte return_non_local = 15;
public static final java.lang.String[] bytecodeNames = new java.lang.String[] {
"HALT ",
"DUP ",
"PUSH_LOCAL ",
"PUSH_ARGUMENT ",
"PUSH_FIELD ",
"PUSH_BLOCK ",
"PUSH_CONSTANT ",
"PUSH_GLOBAL ",
"POP ",
"POP_LOCAL ",
"POP_ARGUMENT ",
"POP_FIELD ",
"SEND ",
"SUPER_SEND ",
"RETURN_LOCAL ",
"RETURN_NON_LOCAL"
};
private static final byte numBytecodes = 16;
public static int getBytecodeLength(byte bytecode)
{
// Return the length of the given bytecode
return bytecodeLength[bytecode];
}
// Static array holding lengths of each bytecode
private static int[] bytecodeLength = new int[numBytecodes];
static {
// set up the lengths of the "native" bytecodes
bytecodeLength[halt] = 1;
bytecodeLength[dup] = 1;
bytecodeLength[push_local] = 3;
bytecodeLength[push_argument] = 3;
bytecodeLength[push_field] = 2;
bytecodeLength[push_block] = 2;
bytecodeLength[push_constant] = 2;
bytecodeLength[push_global] = 2;
bytecodeLength[pop] = 1;
bytecodeLength[pop_local] = 3;
bytecodeLength[pop_argument] = 3;
bytecodeLength[pop_field] = 2;
bytecodeLength[send] = 2;
bytecodeLength[super_send] = 2;
bytecodeLength[return_local] = 1;
bytecodeLength[return_non_local] = 1;
}
}