Beispiel #1
0
  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;
  }