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

Copyright (c) 2017 Intel Corporation

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The above copyright notice and this permission notice shall be included
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======================= end_copyright_notice ==================================*/

#include "Compiler/Optimizer/OpenCLPasses/ImageFuncs/ImageFuncResolution.hpp"
#include "Compiler/Optimizer/OpenCLPasses/ImageFuncs/ImageFuncsAnalysis.hpp"
#include "Compiler/Optimizer/OCLBIUtils.h"
#include "Compiler/IGCPassSupport.h"

#include "common/LLVMWarningsPush.hpp"
#include <llvmWrapper/IR/Function.h>
#include <llvm/IR/Instructions.h>
#include "common/LLVMWarningsPop.hpp"

using namespace llvm;
using namespace IGC;
using namespace IGC::IGCMD;

// Register pass to igc-opt
#define PASS_FLAG "igc-image-func-resolution"
#define PASS_DESCRIPTION "Resolves image height, width, depth functions"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(ImageFuncResolution, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_DEPENDENCY(MetaDataUtilsWrapper)
IGC_INITIALIZE_PASS_END(ImageFuncResolution, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)

char ImageFuncResolution::ID = 0;

ImageFuncResolution::ImageFuncResolution() : FunctionPass(ID), m_implicitArgs()
{
    initializeImageFuncResolutionPass(*PassRegistry::getPassRegistry());
}

bool ImageFuncResolution::runOnFunction(Function &F) {
    const MetaDataUtils* pMdUtils = getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils();
    m_implicitArgs = ImplicitArgs(F, pMdUtils);
    m_changed = false;
    visit(F);
    return m_changed;
}

void ImageFuncResolution::visitCallInst(CallInst &CI)
{
    if (!CI.getCalledFunction())
    {
        return;
    }

    Value* imageRes = nullptr;
    
    // Add appropriate sequence and image dimension func
    StringRef funcName = CI.getCalledFunction()->getName();

    if( funcName.equals(ImageFuncsAnalysis::GET_IMAGE_HEIGHT) )
    {
        imageRes = getImageHeight(CI);
    }
    else if( funcName.equals(ImageFuncsAnalysis::GET_IMAGE_WIDTH) )
    {
        imageRes = getImageWidth(CI);
    }
    else if( funcName.equals(ImageFuncsAnalysis::GET_IMAGE_DEPTH) )
    {
        imageRes = getImageDepth(CI);
    }
    else if (funcName.equals(ImageFuncsAnalysis::GET_IMAGE_NUM_MIP_LEVELS))
    {
        imageRes = getImageNumMipLevels(CI);
    }
    else if( funcName.equals(ImageFuncsAnalysis::GET_IMAGE_CHANNEL_DATA_TYPE) )
    {
        imageRes = getImageChannelDataType(CI);
    }
    else if( funcName.equals(ImageFuncsAnalysis::GET_IMAGE_CHANNEL_ORDER) )
    {
        imageRes = getImageChannelOrder(CI);
    }
    else if( funcName.equals(ImageFuncsAnalysis::GET_IMAGE_SRGB_CHANNEL_ORDER) )
    {
        imageRes = getImplicitImageArg(CI, ImplicitArg::IMAGE_SRGB_CHANNEL_ORDER);
    }
    else if( funcName.equals(ImageFuncsAnalysis::GET_IMAGE_ARRAY_SIZE) )
    {
        imageRes = getImageArraySize(CI);
    }
    else if (funcName.equals(ImageFuncsAnalysis::GET_IMAGE_NUM_SAMPLES))
    {
        imageRes = getImageNumSamples(CI);
    }
    else if( funcName.equals(ImageFuncsAnalysis::GET_SAMPLER_ADDRESS_MODE) )
    {
        imageRes = getSamplerAddressMode(CI);
    }
    else if( funcName.equals(ImageFuncsAnalysis::GET_SAMPLER_NORMALIZED_COORDS) )
    {
        imageRes = getSamplerNormalizedCoords(CI);
    }
    else if( funcName.equals(ImageFuncsAnalysis::GET_SAMPLER_SNAP_WA_REQUIRED) )
    {
        imageRes = getSamplerSnapWARequired(CI);
    }
    else 
    {
        // Non image function, do nothing
        return;
    }

    // Replace original image dim call instruction by the result of the appropriate sequence
    CI.replaceAllUsesWith(imageRes);
    CI.eraseFromParent();
    m_changed = true;
}

Value* ImageFuncResolution::getImageHeight(CallInst &CI) 
{
    Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_HEIGHT);
    return arg;
}

Value* ImageFuncResolution::getImageWidth(CallInst &CI) 
{
    Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_WIDTH);
    return arg;
}

Value* ImageFuncResolution::getImageDepth(CallInst &CI) 
{
    Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_DEPTH);
    return arg;
}

Value* ImageFuncResolution::getImageNumMipLevels(CallInst &CI) 
{
    Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_NUM_MIP_LEVELS);
    return arg;
}

Value* ImageFuncResolution::getImageChannelDataType(CallInst &CI) 
{
    Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_CHANNEL_DATA_TYPE);
    return arg;
}

Value* ImageFuncResolution::getImageChannelOrder(CallInst &CI) 
{
    Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_CHANNEL_ORDER);
    return arg;
}

Value* ImageFuncResolution::getImageArraySize(CallInst &CI) 
{
    Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_ARRAY_SIZE);
    return arg;
}

Value* ImageFuncResolution::getImageNumSamples(CallInst &CI)
{
    Argument* arg = getImplicitImageArg(CI, ImplicitArg::IMAGE_NUM_SAMPLES);
    return arg;
}

Value* ImageFuncResolution::getSamplerAddressMode(CallInst &CI)
{
    MetaDataUtils* pMdUtils = getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils();
    ModuleMetaData* modMD = getAnalysis<MetaDataUtilsWrapper>().getModuleMetaData();

    Value* sampler = CImagesBI::CImagesUtils::traceImageOrSamplerArgument(&CI, 0, pMdUtils, modMD);
    assert(sampler != nullptr && "Sampler untraceable for ImplicitArg::SAMPLER_ADDRESS");
    if (isa<Argument>(sampler))
    {
        Argument* arg = getImplicitImageArg(CI, ImplicitArg::SAMPLER_ADDRESS);
        return arg;
    }
    else
    {
        llvm::Function* pFunc = CI.getParent()->getParent();

        assert(isa<ConstantInt>(sampler) && "Sampler must be a constant integer");
        InlineSamplerState samplerStateAddressMode{ cast<ConstantInt>(sampler)->getZExtValue() };
        uint64_t samplerVal = 0;
        uint samplerValue = int_cast<unsigned int>(cast<ConstantInt>(sampler)->getZExtValue());
        if (modMD->FuncMD.find(pFunc) != modMD->FuncMD.end())
        {
            FunctionMetaData funcMD = modMD->FuncMD[pFunc];
            ResourceAllocMD resAllocMD = funcMD.resAllocMD;
            for (auto i = resAllocMD.inlineSamplersMD.begin(), e = resAllocMD.inlineSamplersMD.end(); i != e; i++)
            {
                IGC::InlineSamplersMD inlineSamplerMD = *i;
                if (samplerValue == inlineSamplerMD.m_Value)
                {
                    InlineSamplerState samplerState{ static_cast<uint64_t>(samplerValue) };
                    samplerVal = inlineSamplerMD.addressMode;
                }
            }
        }
        return ConstantInt::get(CI.getType(), samplerVal);
    }
}

Value* ImageFuncResolution::getSamplerNormalizedCoords(CallInst &CI)
{
    MetaDataUtils* pMdUtils = getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils();
    ModuleMetaData* modMD = getAnalysis<MetaDataUtilsWrapper>().getModuleMetaData();
    Value* sampler = CImagesBI::CImagesUtils::traceImageOrSamplerArgument(&CI, 0, pMdUtils, modMD);
    if (sampler == nullptr)
    {
        // TODO: For now disable WA if unable to trace sampler argument. 
        // Will need to rework WA to add support for indirect sampler case.
        return ConstantInt::get(CI.getType(), 0);
    }
    else if (isa<Argument>(sampler))
    {
        Argument* arg = getImplicitImageArg(CI, ImplicitArg::SAMPLER_NORMALIZED);
        return arg;
    }
    else
    {
        llvm::Function* pFunc = CI.getParent()->getParent();
        assert(isa<ConstantInt>(sampler) && "Sampler must be a constant integer");

        uint64_t samplerVal = 0;
        uint samplerValue = int_cast<unsigned int>(cast<ConstantInt>(sampler)->getZExtValue());

        if (modMD->FuncMD.find(pFunc) != modMD->FuncMD.end())
        {
            FunctionMetaData funcMD = modMD->FuncMD[pFunc];
            ResourceAllocMD resAllocMD = funcMD.resAllocMD;
            for (auto i = resAllocMD.inlineSamplersMD.begin(), e = resAllocMD.inlineSamplersMD.end(); i != e; ++i)
            {
                IGC::InlineSamplersMD inlineSamplerMD = *i;
                if (samplerValue == inlineSamplerMD.m_Value)
                {
                    InlineSamplerState samplerState{ static_cast<uint64_t>(samplerValue) };
                    samplerVal = inlineSamplerMD.NormalizedCoords;
                }
            }
        }
        return ConstantInt::get(CI.getType(), samplerVal);
    }
}

Value* ImageFuncResolution::getSamplerSnapWARequired(CallInst &CI) 
{
    MetaDataUtils* pMdUtils = getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils();
    ModuleMetaData* modMD = getAnalysis<MetaDataUtilsWrapper>().getModuleMetaData();
    Value* sampler = CImagesBI::CImagesUtils::traceImageOrSamplerArgument(&CI, 0, pMdUtils, modMD);
    if (sampler == nullptr)
    {
        // TODO: For now disable WA if unable to trace sampler argument. 
        // Will need to rework WA to add support for indirect sampler case.
        return ConstantInt::get(CI.getType(), 0);
    }
    else if (isa<Argument>(sampler))
    {
        Argument* arg = getImplicitImageArg(CI, ImplicitArg::SAMPLER_SNAP_WA);
        return arg;
    }
    else
    {
        assert(isa<ConstantInt>(sampler) && "Sampler must be a constant integer");

        llvm::Function* pFunc = CI.getParent()->getParent();
       
        bool snapWARequired = false;
        uint samplerVal = int_cast<unsigned int>(cast<ConstantInt>(sampler)->getZExtValue());

        if (modMD->FuncMD.find(pFunc) != modMD->FuncMD.end())
        {
            FunctionMetaData funcMD = modMD->FuncMD[pFunc];
            ResourceAllocMD resAllocMD = funcMD.resAllocMD;
            for (auto i = resAllocMD.inlineSamplersMD.begin(), e = resAllocMD.inlineSamplersMD.end(); i != e; ++i)
            {
                InlineSamplersMD inlineSamplerMD = *i;
                if (samplerVal == inlineSamplerMD.m_Value)
                {
                    InlineSamplerState samplerState{ static_cast<uint64_t>(samplerVal) };
                    bool anyAddressModeClamp =
                        inlineSamplerMD.TCXAddressMode == iOpenCL::SAMPLER_TEXTURE_ADDRESS_MODE_BORDER ||
                        inlineSamplerMD.TCYAddressMode == iOpenCL::SAMPLER_TEXTURE_ADDRESS_MODE_BORDER ||
                        inlineSamplerMD.TCZAddressMode == iOpenCL::SAMPLER_TEXTURE_ADDRESS_MODE_BORDER;
                    bool anyMapFilterModeNearest =
                        inlineSamplerMD.MagFilterType == iOpenCL::SAMPLER_MAPFILTER_POINT ||
                        inlineSamplerMD.MinFilterType == iOpenCL::SAMPLER_MAPFILTER_POINT;
                    snapWARequired = anyAddressModeClamp &&
                        anyMapFilterModeNearest &&
                        !inlineSamplerMD.NormalizedCoords;
                }
            }
        }
        return ConstantInt::get(CI.getType(), snapWARequired ? -1 : 0);
    }
}

Argument* ImageFuncResolution::getImplicitImageArg(CallInst &CI, ImplicitArg::ArgType argType) {
    // Only images that are arguments are supported!
    Argument* image = cast<Argument>(CImagesBI::CImagesUtils::traceImageOrSamplerArgument(&CI, 0));

    unsigned int numImplicitArgs = m_implicitArgs.size();
    unsigned int implicitArgIndex = m_implicitArgs.getImageArgIndex(argType, image);

    Function* pFunc = CI.getParent()->getParent();
    unsigned int implicitArgIndexInFunc = IGCLLVM::GetFuncArgSize(pFunc) - numImplicitArgs + implicitArgIndex;
    
    Function::arg_iterator arg = pFunc->arg_begin();
    for (unsigned int i = 0; i < implicitArgIndexInFunc; ++i,  ++arg);

    return &(*arg);
}
