Exemplo n.º 1
0
  /** Perform the appropriate flow operations for declaration of a local variable */
  protected Map flowLocalDecl(
      DataFlowItem inItem, FlowGraph graph, LocalDecl ld, Set succEdgeKeys) {
    Map m = new HashMap(inItem.initStatus);
    MinMaxInitCount initCount = (MinMaxInitCount) m.get(ld.localInstance());
    // if (initCount == null) {
    if (ld.init() != null) {
      // declaration of local var with initialization.
      initCount = new MinMaxInitCount(InitCount.ONE, InitCount.ONE);
    } else {
      // declaration of local var with no initialization.
      initCount = new MinMaxInitCount(InitCount.ZERO, InitCount.ZERO);
    }

    m.put(ld.localInstance(), initCount);
    //        }
    //        else {
    // the initCount is not null. We now have a problem. Why is the
    // initCount not null? Has this variable been assigned in its own
    // initialization, or is this a declaration inside a loop body?
    // XXX@@@ THIS IS A BUG THAT NEEDS TO BE FIXED.
    // Currently, the declaration "final int i = (i=5);" will
    // not be rejected, as we cannot distinguish between that and
    // "while (true) {final int i = 4;}"
    //        }

    // record the fact that we have seen a local declaration
    currCBI.localDeclarations.add(ld.localInstance());

    return itemToMap(new DataFlowItem(m), succEdgeKeys);
  }
  private Node buildLocalDecl(LocalDecl ld) throws SemanticException {
    Type t = ld.declType();
    SJLocalInstance li = (SJLocalInstance) ld.localInstance();
    // SJNamedInstance ni = null;

    if (t.isSubtype(SJ_PROTOCOL_TYPE)) // Mostly the same as for LocalDecl.
    {
      if (!(ld instanceof SJLocalProtocolDecl)) {
        throw new SemanticException(
            "[SJProtocolDeclTypeBuilder] Protocols may only be declared using the protocol keyword: "
                + ld);
      }

      SJTypeNode tn = disambiguateSJTypeNode(this, ((SJProtocolDecl) ld).sessionType());
      SJSessionType st = tn.type();
      String sjname = ld.name(); // Should match that given by SJVariable.sjname.

      ld = ld.localInstance(sjts.SJLocalProtocolInstance(li, st, sjname));
      ld = (LocalDecl) setSJProtocolDeclExt((SJProtocolDecl) ld, tn, sjname);
    }

    return ld;
  }
Exemplo n.º 3
0
  /** Flatten complex expressions within the AST */
  public Node leave(Node old, Node n, NodeVisitor v) {
    if (n == noFlatten) {
      noFlatten = null;
      return n;
    }

    if (n instanceof Block) {
      List l = (List) stack.removeFirst();
      return ((Block) n).statements(l);
    } else if (n instanceof Stmt && !(n instanceof LocalDecl)) {
      List l = (List) stack.getFirst();
      l.add(n);
      return n;
    } else if (n instanceof Expr
        && !(n instanceof Lit)
        && !(n instanceof Special)
        && !(n instanceof Local)) {

      Expr e = (Expr) n;

      if (e instanceof Assign) {
        return n;
      }

      // create a local temp, initialized to the value of the complex
      // expression

      String name = newID();
      LocalDecl def =
          nf.LocalDecl(
              e.position(), Flags.FINAL, nf.CanonicalTypeNode(e.position(), e.type()), name, e);
      def = def.localInstance(ts.localInstance(e.position(), Flags.FINAL, e.type(), name));

      List l = (List) stack.getFirst();
      l.add(def);

      // return the local temp instead of the complex expression
      Local use = nf.Local(e.position(), name);
      use = (Local) use.type(e.type());
      use = use.localInstance(ts.localInstance(e.position(), Flags.FINAL, e.type(), name));
      return use;
    }

    return n;
  }
Exemplo n.º 4
0
  private Node translateExtendedFor(ExtendedFor n, List<String> labels) throws SemanticException {

    if (n.expr().type().isArray()) {
      return translateExtForArray(n, labels);
    }

    Position pos = Position.compilerGenerated();
    Type iterType = ts.typeForName("java.util.Iterator");
    Type iteratedType = n.decl().type().type();
    // translate "L1,...,Ln: for (C x: e) b" to
    // "{ Iterator iter = e.iterator(); L1,...,Ln: while (iter.hasNext();)  { C x = (C)iter.next();
    // b }"

    // Create the iter declaration "Iterator iter = e.iterator()"
    Id iterName = freshName("iter");
    LocalDecl iterDecl;
    LocalInstance iterLI = ts.localInstance(pos, Flags.NONE, iterType, iterName.id());
    {
      Id id = nodeFactory().Id(pos, "iterator");
      Call iterator = nodeFactory().Call(pos, n.expr(), id);
      iterator = (Call) iterator.type(iterType);
      iterator =
          iterator.methodInstance(
              ts.findMethod(
                  n.expr().type().toClass(),
                  "iterator",
                  Collections.<Type>emptyList(),
                  this.context().currentClass()));

      iterDecl =
          nodeFactory()
              .LocalDecl(
                  pos,
                  Flags.NONE,
                  nodeFactory().CanonicalTypeNode(pos, iterType),
                  iterName,
                  iterator);
      iterDecl = iterDecl.localInstance(iterLI);
    }

    // create the loop body
    List<Stmt> loopBody = new ArrayList<Stmt>();
    {
      Id id = nodeFactory().Id(pos, "next");
      Call call =
          nodeFactory()
              .Call(
                  pos,
                  ((Local) nodeFactory().Local(pos, iterName).type(iterType))
                      .localInstance(iterDecl.localInstance()),
                  id);
      call = (Call) call.type(ts.Object());
      call =
          call.methodInstance(
              ts.findMethod(
                  iterType.toClass(),
                  "next",
                  Collections.<Type>emptyList(),
                  this.context().currentClass()));

      Cast cast = nodeFactory().Cast(pos, nodeFactory().CanonicalTypeNode(pos, iteratedType), call);
      cast = (Cast) cast.type(iteratedType);

      loopBody.add(n.decl().init(cast));
      loopBody.add(n.body());
    }

    // create the while loop
    While loop;
    {
      Id id = nodeFactory().Id(pos, "hasNext");
      Call cond =
          nodeFactory()
              .Call(
                  pos,
                  ((Local) nodeFactory().Local(pos, iterName).type(iterType))
                      .localInstance(iterDecl.localInstance()),
                  id);
      cond = (Call) cond.type(ts.Boolean());
      cond =
          cond.methodInstance(
              ts.findMethod(
                  iterType.toClass(),
                  "hasNext",
                  Collections.<Type>emptyList(),
                  this.context().currentClass()));

      loop = nodeFactory().While(pos, cond, nodeFactory().Block(pos, loopBody));
    }

    return nodeFactory().Block(pos, iterDecl, labelStmt(loop, labels));
  }
Exemplo n.º 5
0
  private Node translateExtForArray(ExtendedFor n, List<String> labels) throws SemanticException {
    Position pos = Position.compilerGenerated();
    Type iteratedType = n.decl().type().type();
    // translate "L1,...,Ln: for (C x: e) b" to
    // "{ C[] arr = e; int iter = 0;  L1,...,Ln: while (iter < arr.length)  { C x = arr[iter]; b ;
    // iter = iter + 1; }"
    List<Stmt> stmts = new ArrayList<Stmt>();

    // add the declaration of arr: "C[] arr = e"
    Id arrID = freshName("arr");
    LocalInstance arrLI = ts.localInstance(pos, Flags.NONE, n.expr().type(), arrID.id());
    {
      LocalDecl ld =
          nodeFactory()
              .LocalDecl(
                  pos, Flags.NONE, nodeFactory().CanonicalTypeNode(pos, arrLI.type()), arrID);
      ld = ld.localInstance(arrLI);
      ld = ld.init(n.expr());
      stmts.add(ld);
    }

    // add the declaration of iterator: "int iter = 0"
    Id iterID = freshName("iter");
    LocalInstance iterLI = ts.localInstance(pos, Flags.NONE, ts.Int(), iterID.id());
    {
      LocalDecl ld =
          nodeFactory()
              .LocalDecl(
                  pos, Flags.NONE, nodeFactory().CanonicalTypeNode(pos, iterLI.type()), iterID);
      ld = ld.localInstance(iterLI);
      ld = ld.init(nodeFactory().IntLit(pos, IntLit.INT, 0).type(ts.Int()));
      stmts.add(ld);
    }

    // build the conditional "iter < arr.length"
    Expr cond;
    {
      Local iterLocal =
          (Local) nodeFactory().Local(pos, iterID).localInstance(iterLI).type(ts.Int());
      Local arrLocal =
          (Local) nodeFactory().Local(pos, arrID).localInstance(arrLI).type(arrLI.type());
      Id id = nodeFactory().Id(pos, "length");
      Field field = (Field) nodeFactory().Field(pos, arrLocal, id).type(ts.Int());
      field = field.fieldInstance(ts.findField(arrLI.type().toReference(), "length"));

      cond = nodeFactory().Binary(pos, iterLocal, Binary.LT, field).type(ts.Boolean());
    }

    // build the initlizer for the local decl: arr[iter]
    Expr init;
    {
      Local iterLocal =
          (Local) nodeFactory().Local(pos, iterID).localInstance(iterLI).type(ts.Int());
      Local arrLocal =
          (Local) nodeFactory().Local(pos, arrID).localInstance(arrLI).type(arrLI.type());
      init = nodeFactory().ArrayAccess(pos, arrLocal, iterLocal);
      init = init.type(iteratedType);
    }

    // build the increment for iter (iter = iter + 1;)
    Stmt inc;
    {
      Local iterLocal =
          (Local) nodeFactory().Local(pos, iterID).localInstance(iterLI).type(ts.Int());
      Expr incExpr =
          nodeFactory()
              .Binary(
                  pos,
                  iterLocal.type(ts.Int()),
                  Binary.ADD,
                  nodeFactory().IntLit(pos, IntLit.INT, 1).type(ts.Int()))
              .type(ts.Int());
      Assign incStore =
          (Assign) nodeFactory().Assign(pos, iterLocal, Assign.ASSIGN, incExpr).type(ts.Int());
      inc = nodeFactory().Eval(pos, incStore);
    }

    // build the while loop
    {
      // Create a new loop body from the old body followed by the increment
      Block loopBody = nodeFactory().Block(pos, n.decl().init(init), n.body(), inc);
      While loop = nodeFactory().While(pos, cond, loopBody);
      stmts.add(labelStmt(loop, labels));
    }
    return nodeFactory().Block(pos, stmts);
  }