/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2010 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;
/**
* This class provides methods to create and reuse Instruction objects.
*
* @author Eric Lafortune
*/
public class InstructionFactory
{
/**
* Creates a new Instruction from the data in the byte array, starting
* at the given index.
*/
public static Instruction create(byte[] code, int offset)
{
Instruction instruction;
int index = offset;
byte opcode = code[index++];
boolean wide = false;
if (opcode == InstructionConstants.OP_WIDE)
{
opcode = code[index++];
wide = true;
}
switch (opcode)
{
// Simple instructions.
case InstructionConstants.OP_NOP:
case InstructionConstants.OP_ACONST_NULL:
case InstructionConstants.OP_ICONST_M1:
case InstructionConstants.OP_ICONST_0:
case InstructionConstants.OP_ICONST_1:
case InstructionConstants.OP_ICONST_2:
case InstructionConstants.OP_ICONST_3:
case InstructionConstants.OP_ICONST_4:
case InstructionConstants.OP_ICONST_5:
case InstructionConstants.OP_LCONST_0:
case InstructionConstants.OP_LCONST_1:
case InstructionConstants.OP_FCONST_0:
case InstructionConstants.OP_FCONST_1:
case InstructionConstants.OP_FCONST_2:
case InstructionConstants.OP_DCONST_0:
case InstructionConstants.OP_DCONST_1:
case InstructionConstants.OP_BIPUSH:
case InstructionConstants.OP_SIPUSH:
case InstructionConstants.OP_IALOAD:
case InstructionConstants.OP_LALOAD:
case InstructionConstants.OP_FALOAD:
case InstructionConstants.OP_DALOAD:
case InstructionConstants.OP_AALOAD:
case InstructionConstants.OP_BALOAD:
case InstructionConstants.OP_CALOAD:
case InstructionConstants.OP_SALOAD:
case InstructionConstants.OP_IASTORE:
case InstructionConstants.OP_LASTORE:
case InstructionConstants.OP_FASTORE:
case InstructionConstants.OP_DASTORE:
case InstructionConstants.OP_AASTORE:
case InstructionConstants.OP_BASTORE:
case InstructionConstants.OP_CASTORE:
case InstructionConstants.OP_SASTORE:
case InstructionConstants.OP_POP:
case InstructionConstants.OP_POP2:
case InstructionConstants.OP_DUP:
case InstructionConstants.OP_DUP_X1:
case InstructionConstants.OP_DUP_X2:
case InstructionConstants.OP_DUP2:
case InstructionConstants.OP_DUP2_X1:
case InstructionConstants.OP_DUP2_X2:
case InstructionConstants.OP_SWAP:
case InstructionConstants.OP_IADD:
case InstructionConstants.OP_LADD:
case InstructionConstants.OP_FADD:
case InstructionConstants.OP_DADD:
case InstructionConstants.OP_ISUB:
case InstructionConstants.OP_LSUB:
case InstructionConstants.OP_FSUB:
case InstructionConstants.OP_DSUB:
case InstructionConstants.OP_IMUL:
case InstructionConstants.OP_LMUL:
case InstructionConstants.OP_FMUL:
case InstructionConstants.OP_DMUL:
case InstructionConstants.OP_IDIV:
case InstructionConstants.OP_LDIV:
case InstructionConstants.OP_FDIV:
case InstructionConstants.OP_DDIV:
case InstructionConstants.OP_IREM:
case InstructionConstants.OP_LREM:
case InstructionConstants.OP_FREM:
case InstructionConstants.OP_DREM:
case InstructionConstants.OP_INEG:
case InstructionConstants.OP_LNEG:
case InstructionConstants.OP_FNEG:
case InstructionConstants.OP_DNEG:
case InstructionConstants.OP_ISHL:
case InstructionConstants.OP_LSHL:
case InstructionConstants.OP_ISHR:
case InstructionConstants.OP_LSHR:
case InstructionConstants.OP_IUSHR:
case InstructionConstants.OP_LUSHR:
case InstructionConstants.OP_IAND:
case InstructionConstants.OP_LAND:
case InstructionConstants.OP_IOR:
case InstructionConstants.OP_LOR:
case InstructionConstants.OP_IXOR:
case InstructionConstants.OP_LXOR:
case InstructionConstants.OP_I2L:
case InstructionConstants.OP_I2F:
case InstructionConstants.OP_I2D:
case InstructionConstants.OP_L2I:
case InstructionConstants.OP_L2F:
case InstructionConstants.OP_L2D:
case InstructionConstants.OP_F2I:
case InstructionConstants.OP_F2L:
case InstructionConstants.OP_F2D:
case InstructionConstants.OP_D2I:
case InstructionConstants.OP_D2L:
case InstructionConstants.OP_D2F:
case InstructionConstants.OP_I2B:
case InstructionConstants.OP_I2C:
case InstructionConstants.OP_I2S:
case InstructionConstants.OP_LCMP:
case InstructionConstants.OP_FCMPL:
case InstructionConstants.OP_FCMPG:
case InstructionConstants.OP_DCMPL:
case InstructionConstants.OP_DCMPG:
case InstructionConstants.OP_IRETURN:
case InstructionConstants.OP_LRETURN:
case InstructionConstants.OP_FRETURN:
case InstructionConstants.OP_DRETURN:
case InstructionConstants.OP_ARETURN:
case InstructionConstants.OP_RETURN:
case InstructionConstants.OP_NEWARRAY:
case InstructionConstants.OP_ARRAYLENGTH:
case InstructionConstants.OP_ATHROW:
case InstructionConstants.OP_MONITORENTER:
case InstructionConstants.OP_MONITOREXIT:
instruction = new SimpleInstruction();
break;
// Instructions with a contant pool index.
case InstructionConstants.OP_LDC:
case InstructionConstants.OP_LDC_W:
case InstructionConstants.OP_LDC2_W:
case InstructionConstants.OP_GETSTATIC:
case InstructionConstants.OP_PUTSTATIC:
case InstructionConstants.OP_GETFIELD:
case InstructionConstants.OP_PUTFIELD:
case InstructionConstants.OP_INVOKEVIRTUAL:
case InstructionConstants.OP_INVOKESPECIAL:
case InstructionConstants.OP_INVOKESTATIC:
case InstructionConstants.OP_INVOKEINTERFACE:
case InstructionConstants.OP_NEW:
case InstructionConstants.OP_ANEWARRAY:
case InstructionConstants.OP_CHECKCAST:
case InstructionConstants.OP_INSTANCEOF:
case InstructionConstants.OP_MULTIANEWARRAY:
instruction = new ConstantInstruction();
break;
// Instructions with a local variable index.
case InstructionConstants.OP_ILOAD:
case InstructionConstants.OP_LLOAD:
case InstructionConstants.OP_FLOAD:
case InstructionConstants.OP_DLOAD:
case InstructionConstants.OP_ALOAD:
case InstructionConstants.OP_ILOAD_0:
case InstructionConstants.OP_ILOAD_1:
case InstructionConstants.OP_ILOAD_2:
case InstructionConstants.OP_ILOAD_3:
case InstructionConstants.OP_LLOAD_0:
case InstructionConstants.OP_LLOAD_1:
case InstructionConstants.OP_LLOAD_2:
case InstructionConstants.OP_LLOAD_3:
case InstructionConstants.OP_FLOAD_0:
case InstructionConstants.OP_FLOAD_1:
case InstructionConstants.OP_FLOAD_2:
case InstructionConstants.OP_FLOAD_3:
case InstructionConstants.OP_DLOAD_0:
case InstructionConstants.OP_DLOAD_1:
case InstructionConstants.OP_DLOAD_2:
case InstructionConstants.OP_DLOAD_3:
case InstructionConstants.OP_ALOAD_0:
case InstructionConstants.OP_ALOAD_1:
case InstructionConstants.OP_ALOAD_2:
case InstructionConstants.OP_ALOAD_3:
case InstructionConstants.OP_ISTORE:
case InstructionConstants.OP_LSTORE:
case InstructionConstants.OP_FSTORE:
case InstructionConstants.OP_DSTORE:
case InstructionConstants.OP_ASTORE:
case InstructionConstants.OP_ISTORE_0:
case InstructionConstants.OP_ISTORE_1:
case InstructionConstants.OP_ISTORE_2:
case InstructionConstants.OP_ISTORE_3:
case InstructionConstants.OP_LSTORE_0:
case InstructionConstants.OP_LSTORE_1:
case InstructionConstants.OP_LSTORE_2:
case InstructionConstants.OP_LSTORE_3:
case InstructionConstants.OP_FSTORE_0:
case InstructionConstants.OP_FSTORE_1:
case InstructionConstants.OP_FSTORE_2:
case InstructionConstants.OP_FSTORE_3:
case InstructionConstants.OP_DSTORE_0:
case InstructionConstants.OP_DSTORE_1:
case InstructionConstants.OP_DSTORE_2:
case InstructionConstants.OP_DSTORE_3:
case InstructionConstants.OP_ASTORE_0:
case InstructionConstants.OP_ASTORE_1:
case InstructionConstants.OP_ASTORE_2:
case InstructionConstants.OP_ASTORE_3:
case InstructionConstants.OP_IINC:
case InstructionConstants.OP_RET:
instruction = new VariableInstruction(wide);
break;
// Instructions with a branch offset operand.
case InstructionConstants.OP_IFEQ:
case InstructionConstants.OP_IFNE:
case InstructionConstants.OP_IFLT:
case InstructionConstants.OP_IFGE:
case InstructionConstants.OP_IFGT:
case InstructionConstants.OP_IFLE:
case InstructionConstants.OP_IFICMPEQ:
case InstructionConstants.OP_IFICMPNE:
case InstructionConstants.OP_IFICMPLT:
case InstructionConstants.OP_IFICMPGE:
case InstructionConstants.OP_IFICMPGT:
case InstructionConstants.OP_IFICMPLE:
case InstructionConstants.OP_IFACMPEQ:
case InstructionConstants.OP_IFACMPNE:
case InstructionConstants.OP_GOTO:
case InstructionConstants.OP_JSR:
case InstructionConstants.OP_IFNULL:
case InstructionConstants.OP_IFNONNULL:
case InstructionConstants.OP_GOTO_W:
case InstructionConstants.OP_JSR_W:
instruction = new BranchInstruction();
break;
// The tableswitch instruction.
case InstructionConstants.OP_TABLESWITCH:
instruction = new TableSwitchInstruction();
break;
// The lookupswitch instruction.
case InstructionConstants.OP_LOOKUPSWITCH:
instruction = new LookUpSwitchInstruction();
break;
default:
throw new IllegalArgumentException("Unknown instruction opcode ["+opcode+"] at offset "+offset);
}
instruction.opcode = opcode;
instruction.readInfo(code, index);
return instruction;
}
}