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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ART_COMPILER_SEA_IR_IR_SEA_NODE_H_
     18 #define ART_COMPILER_SEA_IR_IR_SEA_NODE_H_
     19 
     20 #include "base/stringprintf.h"
     21 
     22 namespace sea_ir {
     23 class Region;
     24 class IRVisitor;
     25 
     26 class IVisitable {
     27  public:
     28   virtual void Accept(IRVisitor* visitor) = 0;
     29   virtual ~IVisitable() {}
     30 };
     31 
     32 // This abstract class provides the essential services that
     33 // we want each SEA IR element to have.
     34 // At the moment, these are:
     35 // - an id and corresponding string representation.
     36 // - a .dot graph language representation for .dot output.
     37 //
     38 // Note that SEA IR nodes could also be Regions, Projects
     39 // which are not instructions.
     40 class SeaNode: public IVisitable {
     41  public:
     42   explicit SeaNode():id_(GetNewId()), string_id_() {
     43     string_id_ = art::StringPrintf("%d", id_);
     44   }
     45 
     46   // Adds CFG predecessors and successors to each block.
     47   void AddSuccessor(Region* successor);
     48   void AddPredecessor(Region* predecesor);
     49 
     50   // Returns the id of the current block as string
     51   const std::string& StringId() const {
     52     return string_id_;
     53   }
     54   // Returns the id of this node as int. The id is supposed to be unique among
     55   // all instances of all subclasses of this class.
     56   int Id() const {
     57     return id_;
     58   }
     59 
     60   virtual ~SeaNode() { }
     61 
     62  protected:
     63   static int GetNewId() {
     64     return current_max_node_id_++;
     65   }
     66 
     67   const int id_;
     68   std::string string_id_;
     69 
     70  private:
     71   static int current_max_node_id_;
     72   // Creating new instances of sea node objects should not be done through copy or assignment
     73   // operators because that would lead to duplication of their unique ids.
     74   DISALLOW_COPY_AND_ASSIGN(SeaNode);
     75 };
     76 }  // namespace sea_ir
     77 #endif  // ART_COMPILER_SEA_IR_IR_SEA_NODE_H_
     78