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package org.graalvm.compiler.bytecode;

A utility for processing Bytecodes.LOOKUPSWITCH bytecodes.
/** * A utility for processing {@link Bytecodes#LOOKUPSWITCH} bytecodes. */
public class BytecodeLookupSwitch extends BytecodeSwitch { private static final int OFFSET_TO_NUMBER_PAIRS = 4; private static final int OFFSET_TO_FIRST_PAIR_MATCH = 8; private static final int OFFSET_TO_FIRST_PAIR_OFFSET = 12; private static final int PAIR_SIZE = 8;
Constructor for a BytecodeStream.
Params:
  • stream – the BytecodeStream containing the switch instruction
  • bci – the index in the stream of the switch instruction
/** * Constructor for a {@link BytecodeStream}. * * @param stream the {@code BytecodeStream} containing the switch instruction * @param bci the index in the stream of the switch instruction */
public BytecodeLookupSwitch(BytecodeStream stream, int bci) { super(stream, bci); } @Override public int offsetAt(int i) { return stream.readInt(alignedBci + OFFSET_TO_FIRST_PAIR_OFFSET + PAIR_SIZE * i); } @Override public int keyAt(int i) { return stream.readInt(alignedBci + OFFSET_TO_FIRST_PAIR_MATCH + PAIR_SIZE * i); } @Override public int numberOfCases() { return stream.readInt(alignedBci + OFFSET_TO_NUMBER_PAIRS); } @Override public int size() { return alignedBci + OFFSET_TO_FIRST_PAIR_MATCH + PAIR_SIZE * numberOfCases() - bci; } }