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

Copyright (c) 2017 Intel Corporation

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"Software"), to deal in the Software without restriction, including
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======================= end_copyright_notice ==================================*/
#pragma once
#include "Compiler/CISACodeGen/helper.h"
#include "Compiler/CISACodeGen/WIAnalysis.hpp"
#include "Compiler/MetaDataUtilsWrapper.h"
#include "Compiler/CISACodeGen/CollectGeometryShaderProperties.hpp"
#include "Compiler/CISACodeGen/VertexShaderLowering.hpp"
#include "Compiler/CISACodeGen/DomainShaderLowering.hpp"
#include "Compiler/CISACodeGen/HullShaderLowering.hpp"
#include "Compiler/CISACodeGen/PullConstantHeuristics.hpp"
#include "ShaderCodeGen.hpp"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/IR/DataLayout.h>
#include <llvm/IR/PassManager.h>
#include "common/LLVMWarningsPop.hpp"
#include "FunctionUpgrader.h"

#include <map>

namespace IGC
{
enum class PushConstantMode
{
    NO_PUSH_CONSTANT    = 0,
    SIMPLE_PUSH         = 1,
    GATHER_CONSTANT     = 2,
};

class PushAnalysis : public llvm::ModulePass
{
    const llvm::DataLayout *m_DL;
    static const uint32_t MaxConstantBufferIndexSize;
    static const uint32_t MaxNumOfPushedInputs;
    static const uint32_t TessFactorsURBHeader;
    static const uint32_t HSEightPatchMaxNumOfPushedControlPoints;
    static const uint32_t m_pMaxNumOfVSPushedInputs;
    static const uint32_t m_pMaxNumOfHSPushedInputs;
    static const uint32_t m_pMaxNumOfDSPushedInputs;
    static const uint32_t m_pMaxNumOfGSPushedInputs;

	bool m_funcTypeChanged;
	std::map <llvm::Function*, bool> m_isFuncTypeChanged;

    llvm::Module* m_module;
    llvm::Function *m_pFunction;
    IGCMD::MetaDataUtils *m_pMdUtils;
    llvm::PostDominatorTree* m_PDT;
    llvm::DominatorTree* m_DT;
    llvm::BasicBlock* m_entryBB;

    PullConstantHeuristics *m_pullConstantHeuristics;

    CollectHullShaderProperties* m_hsProps;
    CollectDomainShaderProperties* m_dsProps;
    CollectVertexShaderProperties* m_vsProps;
    CollectGeometryShaderProperties* m_gsProps;
    CodeGenContext* m_context;
    llvm::DenseMap<llvm::Instruction*, bool> m_statelessLoads;
    uint    m_cbToLoad;
    uint    m_maxStatelessOffset;
	int    m_argIndex;
	std::vector < llvm::Value* > m_argList;
	FunctionUpgrader m_pFuncUpgrade;

    // Helper function
    /// Return true if the constant is in the range which we are allowed to push
    bool IsPushableShaderConstant(llvm::Instruction *inst, uint& bufId, uint& eltId, bool &isStateless);

    bool GetConstantOffsetForDynamicUniformBuffer(
        uint bufferId,
        llvm::Value *offsetValue,
        uint &relativeOffsetInBytes);
    
    /// process simple push for the function
    void BlockPushConstants();

    /// Try to push allocate space for the constant to be pushed
    unsigned int AllocatePushedConstant(
        llvm::Instruction* load, unsigned int cbIdx, unsigned int offset, unsigned int maxSizeAllowed, bool isStateless);

    /// promote the load to function argument
    void PromoteLoadToSimplePush(llvm::Instruction* load, SimplePushInfo& info, unsigned int offset);

    /// return true if the inputs are uniform
    bool AreUniformInputsBasedOnDispatchMode();
    /// return true if we are allowed to push constants
    bool CanPushConstants();

    /// Return true if the Load is a stateless.
    bool IsStatelessCBLoad(llvm::Instruction *inst, unsigned int& pBaseAddress, unsigned int& offset);

    /// return the maximum number of inputs pushed for this kernel
    unsigned int GetMaxNumberOfPushedInputs();
    unsigned int GetHSMaxNumberOfPushedInputs();
    bool DispatchGRFHardwareWAForHSAndGSDisabled();

    /// return the push constant mode supported based on driver and platform support
    PushConstantMode GetPushConstantMode();

    void processGather(llvm::Instruction* inst, uint bufId, uint eltId);
    void processInput(llvm::Instruction* inst, bool gsInstancingUsed);
    void processInputVec(llvm::Instruction* inst, bool gsInstancingUsed);
    void processURBRead(llvm::Instruction* inst, bool gsInstancingUsed,
        bool vsHasConstantBufferIndexedWithInstanceId,
        uint32_t vsUrbReadIndexForInstanceIdSGV);
    void processRuntimeValue(llvm::GenIntrinsicInst* intrinsic);

public:
    static char ID;
    PushAnalysis();
    virtual void getAnalysisUsage(llvm::AnalysisUsage &AU) const override
    {
        AU.setPreservesCFG();
        AU.addRequired<MetaDataUtilsWrapper>();
        AU.addRequired<CodeGenContextWrapper>();
        AU.addRequired<llvm::PostDominatorTreeWrapperPass>();
        AU.addRequired<llvm::DominatorTreeWrapperPass>();
        AU.addRequired<PullConstantHeuristics>();
    }

	llvm::Value* addArgumentAndMetadata(llvm::Type *pType, std::string argName, IGC::WIAnalysis::WIDependancy dependency);
	bool runOnModule(llvm::Module& ) override;
    void ProcessFunction();
    void AnalyzeFunction(llvm::Function *F)
    {
        m_pFunction = F;
        m_module = F->getParent();

		// We need to initialize m_argIndex and m_argList appropriately as there might be some arguments added before push analysis stage
		m_argIndex = 0;
		m_argList.clear();
		for (auto arg = m_pFunction->arg_begin(); arg != m_pFunction->arg_end(); ++arg)
		{
			m_argList.push_back(&(*arg));
			m_argIndex++;
		}
		m_argIndex = m_argIndex - 1;

        if (m_pMdUtils->findFunctionsInfoItem(F) != m_pMdUtils->end_FunctionsInfo())
        {
            // TODO: when doing codegen for cps shader.  We will run CodeGen twice, 
            // first for coarse_phase, then pixel_phase, see CodeGen().
            // While the pushinfo metadata is not stored using function as index.
            // So when doing codege for pixel_phase, we need to clear legacy
            // pushinfo metadata from coarse_phase. A better solution is to store
            // pushinfo with function index. It's tricky here, refactor in future.
            ModuleMetaData *modMD = getAnalysis<MetaDataUtilsWrapper>().getModuleMetaData();
            modMD->pushInfo.pushAnalysisWIInfos.clear();

            ProcessFunction();
        }
    }

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

}//namespace IGC
