//===- SPIRVBasicBlock.h – SPIR-V Basic Block --------------------*- C++ -*-===//
//
//                     The LLVM/SPIRV Translator
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
// Copyright (c) 2014 Advanced Micro Devices, Inc. All rights reserved.
//
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// copy of this software and associated documentation files (the "Software"),
// to deal with the Software without restriction, including without limitation
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// Software is furnished to do so, subject to the following conditions:
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//
//===----------------------------------------------------------------------===//
/// \file
///
/// This file defines Basic Block class for SPIR-V.
///
//===----------------------------------------------------------------------===//

#ifndef SPIRVBASICBLOCK_HPP_
#define SPIRVBASICBLOCK_HPP_

#include "SPIRVValue.h"
#include <algorithm>

namespace SPIRV{
class SPIRVFunction;
class SPIRVInstruction;
class SPIRVDecoder;
class SPIRVBasicBlock: public SPIRVValue {

public:
  SPIRVBasicBlock(SPIRVId TheId, SPIRVFunction *Func);

  SPIRVBasicBlock():SPIRVValue(OpLabel), ParentF(NULL){
    setAttr();
  }

  SPIRVDecoder getDecoder(std::istream &IS);
  SPIRVFunction *getParent() const { return ParentF;}
  size_t getNumInst() const { return InstVec.size();}
  SPIRVInstruction *getInst(size_t I) const { return InstVec[I];}
  SPIRVInstruction *getPrevious(const SPIRVInstruction *I) const {
    auto Loc = find(I);
    if (Loc == InstVec.end() || Loc == InstVec.begin())
      return nullptr;
    return *(--Loc);
  }
  SPIRVInstruction *getNext(const SPIRVInstruction *I) const {
    auto Loc = find(I);
    if (Loc == InstVec.end())
      return nullptr;
    ++Loc;
    if (Loc == InstVec.end())
      return nullptr;
    return *Loc;
  }

  void setScope(SPIRVEntry *Scope);
  void setParent(SPIRVFunction *F) { ParentF = F;}
  SPIRVInstruction *addInstruction(SPIRVInstruction *I);

  void setAttr() { setHasNoType();}
  _SPIRV_DCL_ENCDEC
  void encodeChildren(spv_ostream &)const;
  void validate()const {
    SPIRVValue::validate();
    assert(ParentF && "Invalid parent function");
  }

private:
  SPIRVFunction *ParentF;
  typedef std::vector<SPIRVInstruction *> SPIRVInstructionVector;
  SPIRVInstructionVector InstVec;

  SPIRVInstructionVector::const_iterator find(const SPIRVInstruction *Inst)
    const {
    return std::find(InstVec.begin(), InstVec.end(), Inst);
  }
};

typedef SPIRVBasicBlock SPIRVLabel;
}

#endif