/**
* Converts the code to a list of instructions.
*
* @param code the code as an array of bytes from which to read the instructions
* @param prependInstructions an array of instructions that is prepended, may be <tt>null</tt>
* @return the <tt>java.util.List</tt> with the instructions
* @throws IOException if an exception occurs with the code
*/
public static ArrayList readByteCode(byte[] code, AbstractInstruction[] prependInstructions)
throws IOException {
ByteCodeInputStream bcis = new ByteCodeInputStream(new ByteArrayInputStream(code));
ArrayList instructions = new ArrayList();
if (prependInstructions != null) {
for (int i = 0; i < prependInstructions.length; i++) {
instructions.add(prependInstructions[i]);
}
}
boolean wide = false;
AbstractInstruction currentInstruction;
while (bcis.getBytesRead() < code.length) {
currentInstruction = readNextInstruction(bcis, wide);
wide = (currentInstruction.getOpcode() == OPCODE_WIDE);
instructions.add(currentInstruction);
}
return instructions;
}
private static AbstractInstruction readNextInstruction(ByteCodeInputStream bcis, boolean wide)
throws IOException {
AbstractInstruction instruction;
int opcode = bcis.readUnsignedByte();
switch (opcode) {
case OPCODE_WIDE:
case OPCODE_NOP:
case OPCODE_ACONST_NULL:
case OPCODE_ICONST_M1:
case OPCODE_ICONST_0:
case OPCODE_ICONST_1:
case OPCODE_ICONST_2:
case OPCODE_ICONST_3:
case OPCODE_ICONST_4:
case OPCODE_ICONST_5:
case OPCODE_LCONST_0:
case OPCODE_LCONST_1:
case OPCODE_FCONST_0:
case OPCODE_FCONST_1:
case OPCODE_FCONST_2:
case OPCODE_DCONST_0:
case OPCODE_DCONST_1:
case OPCODE_ILOAD_0:
case OPCODE_ILOAD_1:
case OPCODE_ILOAD_2:
case OPCODE_ILOAD_3:
case OPCODE_LLOAD_0:
case OPCODE_LLOAD_1:
case OPCODE_LLOAD_2:
case OPCODE_LLOAD_3:
case OPCODE_FLOAD_0:
case OPCODE_FLOAD_1:
case OPCODE_FLOAD_2:
case OPCODE_FLOAD_3:
case OPCODE_DLOAD_0:
case OPCODE_DLOAD_1:
case OPCODE_DLOAD_2:
case OPCODE_DLOAD_3:
case OPCODE_ALOAD_0:
case OPCODE_ALOAD_1:
case OPCODE_ALOAD_2:
case OPCODE_ALOAD_3:
case OPCODE_IALOAD:
case OPCODE_LALOAD:
case OPCODE_FALOAD:
case OPCODE_DALOAD:
case OPCODE_AALOAD:
case OPCODE_BALOAD:
case OPCODE_CALOAD:
case OPCODE_SALOAD:
case OPCODE_ISTORE_0:
case OPCODE_ISTORE_1:
case OPCODE_ISTORE_2:
case OPCODE_ISTORE_3:
case OPCODE_LSTORE_0:
case OPCODE_LSTORE_1:
case OPCODE_LSTORE_2:
case OPCODE_LSTORE_3:
case OPCODE_FSTORE_0:
case OPCODE_FSTORE_1:
case OPCODE_FSTORE_2:
case OPCODE_FSTORE_3:
case OPCODE_DSTORE_0:
case OPCODE_DSTORE_1:
case OPCODE_DSTORE_2:
case OPCODE_DSTORE_3:
case OPCODE_ASTORE_0:
case OPCODE_ASTORE_1:
case OPCODE_ASTORE_2:
case OPCODE_ASTORE_3:
case OPCODE_IASTORE:
case OPCODE_LASTORE:
case OPCODE_FASTORE:
case OPCODE_DASTORE:
case OPCODE_AASTORE:
case OPCODE_BASTORE:
case OPCODE_CASTORE:
case OPCODE_SASTORE:
case OPCODE_POP:
case OPCODE_POP2:
case OPCODE_DUP:
case OPCODE_DUP_X1:
case OPCODE_DUP_X2:
case OPCODE_DUP2:
case OPCODE_DUP2_X1:
case OPCODE_DUP2_X2:
case OPCODE_SWAP:
case OPCODE_IADD:
case OPCODE_LADD:
case OPCODE_FADD:
case OPCODE_DADD:
case OPCODE_ISUB:
case OPCODE_LSUB:
case OPCODE_FSUB:
case OPCODE_DSUB:
case OPCODE_IMUL:
case OPCODE_LMUL:
case OPCODE_FMUL:
case OPCODE_DMUL:
case OPCODE_IDIV:
case OPCODE_LDIV:
case OPCODE_FDIV:
case OPCODE_DDIV:
case OPCODE_IREM:
case OPCODE_LREM:
case OPCODE_FREM:
case OPCODE_DREM:
case OPCODE_INEG:
case OPCODE_LNEG:
case OPCODE_FNEG:
case OPCODE_DNEG:
case OPCODE_ISHL:
case OPCODE_LSHL:
case OPCODE_ISHR:
case OPCODE_LSHR:
case OPCODE_IUSHR:
case OPCODE_LUSHR:
case OPCODE_IAND:
case OPCODE_LAND:
case OPCODE_IOR:
case OPCODE_LOR:
case OPCODE_IXOR:
case OPCODE_LXOR:
case OPCODE_I2L:
case OPCODE_I2F:
case OPCODE_I2D:
case OPCODE_L2I:
case OPCODE_L2F:
case OPCODE_L2D:
case OPCODE_F2I:
case OPCODE_F2L:
case OPCODE_F2D:
case OPCODE_D2I:
case OPCODE_D2L:
case OPCODE_D2F:
case OPCODE_I2B:
case OPCODE_I2C:
case OPCODE_I2S:
case OPCODE_LCMP:
case OPCODE_FCMPL:
case OPCODE_FCMPG:
case OPCODE_DCMPL:
case OPCODE_DCMPG:
case OPCODE_IRETURN:
case OPCODE_LRETURN:
case OPCODE_FRETURN:
case OPCODE_DRETURN:
case OPCODE_ARETURN:
case OPCODE_RETURN:
case OPCODE_ARRAYLENGTH:
case OPCODE_ATHROW:
case OPCODE_MONITORENTER:
case OPCODE_MONITOREXIT:
case OPCODE_BREAKPOINT:
case OPCODE_IMPDEP1:
case OPCODE_IMPDEP2:
instruction = new SimpleInstruction(opcode);
break;
case OPCODE_BIPUSH:
case OPCODE_LDC:
case OPCODE_ILOAD: // subject to wide
case OPCODE_LLOAD: // subject to wide
case OPCODE_FLOAD: // subject to wide
case OPCODE_DLOAD: // subject to wide
case OPCODE_ALOAD: // subject to wide
case OPCODE_ISTORE: // subject to wide
case OPCODE_LSTORE: // subject to wide
case OPCODE_FSTORE: // subject to wide
case OPCODE_DSTORE: // subject to wide
case OPCODE_ASTORE: // subject to wide
case OPCODE_RET: // subject to wide
case OPCODE_NEWARRAY:
instruction = new ImmediateByteInstruction(opcode, wide);
break;
case OPCODE_LDC_W:
case OPCODE_LDC2_W:
case OPCODE_GETSTATIC:
case OPCODE_PUTSTATIC:
case OPCODE_GETFIELD:
case OPCODE_PUTFIELD:
case OPCODE_INVOKEVIRTUAL:
case OPCODE_INVOKESPECIAL:
case OPCODE_INVOKESTATIC:
case OPCODE_NEW:
case OPCODE_ANEWARRAY:
case OPCODE_CHECKCAST:
case OPCODE_INSTANCEOF:
case OPCODE_SIPUSH: // the only immediate short instruction that does
// not have an immediate constant pool reference
instruction = new ImmediateShortInstruction(opcode);
break;
case OPCODE_IFEQ:
case OPCODE_IFNE:
case OPCODE_IFLT:
case OPCODE_IFGE:
case OPCODE_IFGT:
case OPCODE_IFLE:
case OPCODE_IF_ICMPEQ:
case OPCODE_IF_ICMPNE:
case OPCODE_IF_ICMPLT:
case OPCODE_IF_ICMPGE:
case OPCODE_IF_ICMPGT:
case OPCODE_IF_ICMPLE:
case OPCODE_IF_ACMPEQ:
case OPCODE_IF_ACMPNE:
case OPCODE_GOTO:
case OPCODE_JSR:
case OPCODE_IFNULL:
case OPCODE_IFNONNULL:
instruction = new BranchInstruction(opcode);
break;
case OPCODE_GOTO_W:
case OPCODE_JSR_W:
instruction = new WideBranchInstruction(opcode);
break;
case OPCODE_IINC: // subject to wide
instruction = new IncrementInstruction(opcode, wide);
break;
case OPCODE_TABLESWITCH:
instruction = new TableSwitchInstruction(opcode);
break;
case OPCODE_LOOKUPSWITCH:
instruction = new LookupSwitchInstruction(opcode);
break;
case OPCODE_INVOKEINTERFACE:
instruction = new InvokeInterfaceInstruction(opcode);
break;
case OPCODE_INVOKEDYNAMIC:
instruction = new InvokeDynamicInstruction(opcode);
break;
case OPCODE_MULTIANEWARRAY:
instruction = new MultianewarrayInstruction(opcode);
break;
default:
throw new IOException("invalid opcode 0x" + Integer.toHexString(opcode));
}
instruction.read(bcis);
return instruction;
}