| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu) |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| package proguard.classfile.instruction; |
| |
| import proguard.classfile.*; |
| import proguard.classfile.attribute.CodeAttribute; |
| import proguard.classfile.instruction.visitor.InstructionVisitor; |
| |
| /** |
| * This Instruction represents a simple instruction without variable arguments |
| * or constant pool references. |
| * |
| * @author Eric Lafortune |
| */ |
| public class LookUpSwitchInstruction extends SwitchInstruction |
| { |
| public int[] cases; |
| |
| |
| /** |
| * Creates an uninitialized LookUpSwitchInstruction. |
| */ |
| public LookUpSwitchInstruction() {} |
| |
| |
| /** |
| * Creates a new LookUpSwitchInstruction with the given arguments. |
| */ |
| public LookUpSwitchInstruction(byte opcode, |
| int defaultOffset, |
| int[] cases, |
| int[] jumpOffsets) |
| { |
| this.opcode = opcode; |
| this.defaultOffset = defaultOffset; |
| this.cases = cases; |
| this.jumpOffsets = jumpOffsets; |
| } |
| |
| |
| /** |
| * Copies the given instruction into this instruction. |
| * @param lookUpSwitchInstruction the instruction to be copied. |
| * @return this instruction. |
| */ |
| public LookUpSwitchInstruction copy(LookUpSwitchInstruction lookUpSwitchInstruction) |
| { |
| this.opcode = lookUpSwitchInstruction.opcode; |
| this.defaultOffset = lookUpSwitchInstruction.defaultOffset; |
| this.cases = lookUpSwitchInstruction.cases; |
| this.jumpOffsets = lookUpSwitchInstruction.jumpOffsets; |
| |
| return this; |
| } |
| |
| |
| // Implementations for Instruction. |
| |
| public Instruction shrink() |
| { |
| // There aren't any ways to shrink this instruction. |
| return this; |
| } |
| |
| protected void readInfo(byte[] code, int offset) |
| { |
| // Skip up to three padding bytes. |
| offset += -offset & 3; |
| |
| // Read the two 32-bit arguments. |
| defaultOffset = readInt(code, offset); offset += 4; |
| int jumpOffsetCount = readInt(code, offset); offset += 4; |
| |
| // Read the matches-offset pairs. |
| cases = new int[jumpOffsetCount]; |
| jumpOffsets = new int[jumpOffsetCount]; |
| |
| for (int index = 0; index < jumpOffsetCount; index++) |
| { |
| cases[index] = readInt(code, offset); offset += 4; |
| jumpOffsets[index] = readInt(code, offset); offset += 4; |
| } |
| } |
| |
| |
| protected void writeInfo(byte[] code, int offset) |
| { |
| // Write up to three padding bytes. |
| while ((offset & 3) != 0) |
| { |
| writeByte(code, offset++, 0); |
| } |
| |
| // Write the two 32-bit arguments. |
| writeInt(code, offset, defaultOffset); offset += 4; |
| writeInt(code, offset, cases.length); offset += 4; |
| |
| // Write the matches-offset pairs. |
| for (int index = 0; index < cases.length; index++) |
| { |
| writeInt(code, offset, cases[index]); offset += 4; |
| writeInt(code, offset, jumpOffsets[index]); offset += 4; |
| } |
| } |
| |
| |
| public int length(int offset) |
| { |
| return 1 + (-(offset+1) & 3) + 8 + cases.length * 8; |
| } |
| |
| |
| public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, InstructionVisitor instructionVisitor) |
| { |
| instructionVisitor.visitLookUpSwitchInstruction(clazz, method, codeAttribute, offset, this); |
| } |
| } |