コード例 #1
0
  public boolean checkAccess() {
    ClassInfo clazzInfo = method.getClazzInfo();
    BytecodeInfo bytecode = method.getBytecode();
    Handler[] excHandlers = bytecode.getExceptionHandlers();
    boolean dupSeen = false;
    if (excHandlers != null && excHandlers.length != 0) return false;

    if (method.isStatic()) {
      if (checkStaticAccess()) return true;
    }

    Iterator iter = bytecode.getInstructions().iterator();
    Instruction instr = (Instruction) iter.next();
    while (instr.getOpcode() == opc_nop && iter.hasNext()) instr = (Instruction) iter.next();
    if (instr.getOpcode() != opc_aload || instr.getLocalSlot() != 0) return false;
    instr = (Instruction) iter.next();
    while (instr.getOpcode() == opc_nop && iter.hasNext()) instr = (Instruction) iter.next();

    if (instr.getOpcode() == opc_getfield) {
      Reference ref = instr.getReference();
      ClassInfo refClazz = TypeSignature.getClassInfo(ref.getClazz());
      if (!refClazz.superClassOf(clazzInfo)) return false;
      FieldInfo refField = refClazz.findField(ref.getName(), ref.getType());
      if ((refField.getModifiers() & modifierMask) != 0) return false;
      instr = (Instruction) iter.next();
      while (instr.getOpcode() == opc_nop && iter.hasNext()) instr = (Instruction) iter.next();
      if (instr.getOpcode() < opc_ireturn || instr.getOpcode() > opc_areturn) return false;
      /* For valid bytecode the type matches automatically */
      reference = ref;
      kind = ACCESSGETFIELD;
      return true;
    }
    int params = 0, slot = 1;
    while (instr.getOpcode() >= opc_iload
        && instr.getOpcode() <= opc_aload
        && instr.getLocalSlot() == slot) {
      params++;
      slot += (instr.getOpcode() == opc_lload || instr.getOpcode() == opc_dload) ? 2 : 1;
      instr = (Instruction) iter.next();
      while (instr.getOpcode() == opc_nop && iter.hasNext()) instr = (Instruction) iter.next();
    }
    if (instr.getOpcode() == (opc_dup_x1 - 6) + 3 * slot) {
      /*
       * This is probably a opc_dup_x1 or opc_dup2_x1, preceding a
       * opc_putfield
       */
      instr = (Instruction) iter.next();
      while (instr.getOpcode() == opc_nop && iter.hasNext()) instr = (Instruction) iter.next();
      if (instr.getOpcode() != opc_putfield) return false;
      dupSeen = true;
    }
    if (instr.getOpcode() == opc_putfield) {
      if (params != 1) return false;
      /* For valid bytecode the type of param matches automatically */
      Reference ref = instr.getReference();
      ClassInfo refClazz = TypeSignature.getClassInfo(ref.getClazz());
      if (!refClazz.superClassOf(clazzInfo)) return false;
      FieldInfo refField = refClazz.findField(ref.getName(), ref.getType());
      if ((refField.getModifiers() & modifierMask) != 0) return false;

      instr = (Instruction) iter.next();
      while (instr.getOpcode() == opc_nop && iter.hasNext()) instr = (Instruction) iter.next();
      if (dupSeen) {
        if (instr.getOpcode() < opc_ireturn || instr.getOpcode() > opc_areturn) return false;
        kind = ACCESSDUPPUTFIELD;
      } else {
        if (instr.getOpcode() != opc_return) return false;
        kind = ACCESSPUTFIELD;
      }
      reference = ref;
      return true;
    }
    if (instr.getOpcode() == opc_invokespecial) {
      Reference ref = instr.getReference();
      ClassInfo refClazz = TypeSignature.getClassInfo(ref.getClazz());
      if (!refClazz.superClassOf(clazzInfo)) return false;
      MethodInfo refMethod = refClazz.findMethod(ref.getName(), ref.getType());
      MethodType refType = Type.tMethod(ref.getType());
      if ((refMethod.getModifiers() & modifierMask) != 0
          || refType.getParameterTypes().length != params) return false;
      instr = (Instruction) iter.next();
      while (instr.getOpcode() == opc_nop && iter.hasNext()) instr = (Instruction) iter.next();
      if (refType.getReturnType() == Type.tVoid) {
        if (instr.getOpcode() != opc_return) return false;
      } else {
        if (instr.getOpcode() < opc_ireturn || instr.getOpcode() > opc_areturn) return false;
      }

      /* For valid bytecode the types matches automatically */
      reference = ref;
      kind = ACCESSMETHOD;
      return true;
    }
    return false;
  }