/*===================== begin_copyright_notice ==================================

Copyright (c) 2017 Intel Corporation

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
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The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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======================= end_copyright_notice ==================================*/
#pragma once

#include "AdaptorCommon/ImplicitArgs.hpp"
#include "Compiler/MetaDataUtilsWrapper.h"

#include "common/LLVMWarningsPush.hpp"
#include <llvm/Pass.h>
#include <llvm/Analysis/CallGraph.h>
#include "common/LLVMWarningsPop.hpp"

#include <set>
#include <map>

namespace IGC
{
    class CodeGenContext;
}

namespace IGC
{
    class ImplicitArgs;

    struct ImplicitStructArgument
    {
        union _DW0
        {
            struct _All
            {
                unsigned int argId : 11;
                unsigned int argOffset : 11;
                unsigned int argExplictNum : 10;
            } All;
            unsigned int Value;
        } DW0;
    };

    // struct
    typedef std::map<unsigned int, llvm::Argument*> InfoToImpArgMap;
    typedef std::map<llvm::Function*, InfoToImpArgMap> FuncInfoToImpArgMap;


    typedef std::map<llvm::Argument*, unsigned int> ImpArgToExpNum;
    typedef std::map<llvm::Function*, ImpArgToExpNum> FuncImpToExpNumMap;

    /// @brief  AddImplicitArgs pass used for changing the function signatures and calls to represent
    ///         the implicit arguments needed by each function and passed from the OpenCL runtime
    ///         This pass depdends on the WIFuncAnalysis pass runing before it
    /// @Author Marina Yatsina
    class AddImplicitArgs : public llvm::ModulePass
    {
    public:
        // Pass identification, replacement for typeid
        static char ID;

        /// @brief  Constructor
        AddImplicitArgs();

        /// @brief  Destructor
        ~AddImplicitArgs() {}

        /// @brief  Provides name of pass
        virtual llvm::StringRef getPassName() const override 
        {
            return "AddImplictArgs";
        }

        virtual void getAnalysisUsage(llvm::AnalysisUsage &AU) const override
        {
            AU.addRequired<CodeGenContextWrapper>();
            AU.addRequired<MetaDataUtilsWrapper>();
        }

        /// @brief  Main entry point.
        ///         Goes over all functions and changes their signature to contain the implict arguments
        //          needed by each function, goes over all function calls and adds the implicit arguments
        ///         to the function calls
        /// @param  M The destination module.
        virtual bool runOnModule(llvm::Module &M) override;

    private:
        /// @brief  Create the type of the new function, 
        ///         including all explicit and needed impliict parameters
        /// @param  pFunc           The old function
        /// @param  pImplicitArgs   The impliict arguments needed by this function
        /// @returns    The new functuin type 
        llvm::FunctionType* getNewFuncType(llvm::Function* pFunc, const ImplicitArgs* pImplicitArgs);

        /// @brief  Transfers uses of old arguments to new arguments, sets names of all arguments
        /// @param  pFunc           The old function
        /// @param  pNewFunc        The new function
        /// @param  pImplicitArgs   The impliict arguments needed by this function
        void updateNewFuncArgs(llvm::Function* pFunc, llvm::Function* pNewFunc, const ImplicitArgs* pImplicitArgs);

        //  @brief  replace old CallInst with new CallInst
        void replaceAllUsesWithNewOCLBuiltinFunction(CodeGenContext* ctx, llvm::Function* old_func, llvm::Function* new_func);

        /// @brief  Metadata API obejct.
        IGC::IGCMD::MetaDataUtils *m_pMdUtils;

        FuncInfoToImpArgMap     m_FuncInfoToImpArgMap;
        FuncImpToExpNumMap      m_FuncImpToExpNumMap;
    };

} // namespace IGC

// Builtin CallGraph Analysis Class
namespace IGC
{

    struct ImplicitArgmentDetail
    {
        ImplicitArg::ArgMap     ArgsMaps;
        std::set<unsigned int>  StructArgSet;
    };

    class BuiltinCallGraphAnalysis : public llvm::ModulePass
    {
    public:
        static char ID;

        BuiltinCallGraphAnalysis();
        ~BuiltinCallGraphAnalysis()
        {
            for (auto &Item : argMap)
            {
                delete Item.second;
            } 
        }

        virtual llvm::StringRef getPassName() const override
        {
            return "BuiltinCallGraphAnalysis";
        }

        void getAnalysisUsage(llvm::AnalysisUsage &AU) const override
        {
            AU.addRequired<MetaDataUtilsWrapper>();
            AU.addRequired<CodeGenContextWrapper>();
            AU.addRequired<llvm::CallGraphWrapperPass>();
        }

        virtual bool runOnModule(llvm::Module &M) override;

        void traveseCallGraphSCC(const std::vector<llvm::CallGraphNode *> &SCCNodes);
        void combineTwoArgDetail(ImplicitArgmentDetail&, ImplicitArgmentDetail&, llvm::Value*);
        void writeBackAllIntoMetaData(ImplicitArgmentDetail&, llvm::Function*);

    private:
        IGC::IGCMD::MetaDataUtils *m_pMdUtils;
        llvm::SmallDenseMap<llvm::Function*, ImplicitArgmentDetail *> argMap;
    };

} // namespace IGC
