//===- OCLTypeToSPIRV.h - Adapt types from OCL for SPIRV --------*- 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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//
//===----------------------------------------------------------------------===//
//
// This file implements adaptation of OCL types for SPIRV. It does not modify
// the module. Instead, it returns adapted function type based on kernel
// argument metadata. Later LLVM/SPIRV translator will translate the adapted
// type instead of the original type.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/SPIRV.h"
#include "llvm/Pass.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Function.h"

#include <map>
#include <set>

using namespace llvm;

namespace SPIRV {

class OCLTypeToSPIRV: public ModulePass {
public:
  OCLTypeToSPIRV();
  virtual void getAnalysisUsage(AnalysisUsage &AU) const;
  virtual bool runOnModule(Module &M);

  /// \return Adapted type based on kernel argument metadata. If \p V is
  ///   a function, returns function type.
  /// E.g. for a function with argument of read only opencl.image_2d_t* type
  /// returns a function with argument of type opencl.image2d_t.read_only*.
  Type *getAdaptedType(Value *V);

  static char ID;
private:
  Module *M;
  LLVMContext *Ctx;
  std::map<Value*, Type*> AdaptedTy;    // Adapted types for values
  std::set<Function *> WorkSet;         // Functions to be adapted

  MDNode *getArgBaseTypeMetadata(Function *);
  MDNode *getArgAccessQualifierMetadata(Function *);
  MDNode *getArgMetadata(Function *, const std::string& MDName);
  MDNode *getKernelMetadata(Function *F);
  void adaptArgumentsByMetadata(Function* F);
  void adaptArgumentsBySamplerUse(Module &M);
  void adaptFunction(Function *F);
  void addAdaptedType(Value *V, Type *T);
  void addWork(Function *F);
};

}