/*===================== 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,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

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
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


======================= end_copyright_notice ==================================*/

#include "Compiler/Optimizer/OpenCLPasses/DeviceEnqueueFuncs/DeviceEnqueue.hpp"
#include "Compiler/Optimizer/OCLBIUtils.h"
#include "Compiler/IGCPassSupport.h"

#include <set>

using namespace llvm;
using namespace IGC;

// Register pass to igc-opt
#define PASS_FLAG "igc-device-enqueue-func-analysis"
#define PASS_DESCRIPTION "Analyzes device enqueue functions"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(DeviceEnqueueFuncsAnalysis, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_DEPENDENCY(MetaDataUtilsWrapper)
IGC_INITIALIZE_PASS_DEPENDENCY(CodeGenContextWrapper)
IGC_INITIALIZE_PASS_END(DeviceEnqueueFuncsAnalysis, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)


// Register pass to igc-opt
#define PASS_FLAG2 "igc-device-enqueue-func-resolution"
#define PASS_DESCRIPTION2 "Resolve device enqueue functions"
#define PASS_CFG_ONLY2 false
#define PASS_ANALYSIS2 false
IGC_INITIALIZE_PASS_BEGIN(DeviceEnqueueFuncsResolution, PASS_FLAG2, PASS_DESCRIPTION2, PASS_CFG_ONLY2, PASS_ANALYSIS2)
IGC_INITIALIZE_PASS_DEPENDENCY(MetaDataUtilsWrapper)
IGC_INITIALIZE_PASS_DEPENDENCY(CodeGenContextWrapper)
IGC_INITIALIZE_PASS_END(DeviceEnqueueFuncsResolution, PASS_FLAG2, PASS_DESCRIPTION2, PASS_CFG_ONLY2, PASS_ANALYSIS2)



char DeviceEnqueueFuncsAnalysis::ID = 0;

const llvm::StringRef GET_DEFAULT_DEVICE_QUEUE = "__builtin_IB_get_default_device_queue";
const llvm::StringRef GET_EVENT_POOL = "__builtin_IB_get_event_pool";
const llvm::StringRef GET_MAX_WORKGROUP_SIZE = "__builtin_IB_get_max_workgroup_size";
const llvm::StringRef GET_PARENT_EVENT = "__builtin_IB_get_parent_event";
const llvm::StringRef GET_PREFERED_WORKGROUP_MULTIPLE = "__builtin_IB_get_prefered_workgroup_multiple";
const llvm::StringRef GET_OBJECT_ID = "__builtin_IB_get_object_id";
const llvm::StringRef GET_BLOCK_SIMD_SIZE = "__builtin_IB_get_block_simd_size";

DeviceEnqueueFuncsAnalysis::DeviceEnqueueFuncsAnalysis() :
    ModulePass(ID),
    m_hasDeviceEnqueue(false)
{
    initializeDeviceEnqueueFuncsAnalysisPass(*PassRegistry::getPassRegistry());
}

bool DeviceEnqueueFuncsAnalysis::runOnModule(Module& M) {
    bool changed = false;
    // Run on all functions defined in this module
    for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
        Function* pFunc = &(*I);
        if (pFunc->isDeclaration())
        {
            continue;
        }
        if (runOnFunction(*pFunc))
        {
            changed = true;
        }
    }

    return changed;
}

bool DeviceEnqueueFuncsAnalysis::runOnFunction(Function& F) {

    m_newImplicitArgs.clear();
    m_newNumberedImplicitArgs.clear();

    // Visit the function
    visit(F);

    ImplicitArgs::addImplicitArgs(F, m_newImplicitArgs, getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils());
    ImplicitArgs::addNumberedArgs(F, m_newNumberedImplicitArgs, getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils());

    return m_hasDeviceEnqueue;
}

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

    StringRef funcName = CI.getCalledFunction()->getName();

    // Check for OpenCL image dimension function calls
    ImplicitArg::ArgType argType = ImplicitArg::NUM_IMPLICIT_ARGS;

    if (funcName == GET_DEFAULT_DEVICE_QUEUE)
    {
        argType = ImplicitArg::DEVICE_ENQUEUE_DEFAULT_DEVICE_QUEUE;
    }
    else if (funcName == GET_EVENT_POOL)
    {
        argType = ImplicitArg::DEVICE_ENQUEUE_EVENT_POOL;
    }
    else if (funcName == GET_MAX_WORKGROUP_SIZE)
    {
        argType = ImplicitArg::DEVICE_ENQUEUE_MAX_WORKGROUP_SIZE;
    }
    else if (funcName == GET_PARENT_EVENT)
    {
        argType = ImplicitArg::DEVICE_ENQUEUE_PARENT_EVENT;
    }
    else if (funcName == GET_PREFERED_WORKGROUP_MULTIPLE)
    {
        argType = ImplicitArg::DEVICE_ENQUEUE_PREFERED_WORKGROUP_MULTIPLE;
    }
    else if (funcName == GET_OBJECT_ID)
    {
        // Extract the arg num and add it to the appropriate data structure
        assert(CI.getNumArgOperands() == 1 && "get_object_id function is expected to have only one argument");

        // We support only compile-time constants as arguments of get_object_id()
        ConstantInt* callArg = dyn_cast<ConstantInt>(CI.getArgOperand(0));
        assert(callArg != NULL && "get_object_id function is expected to have only conatnt argument");

        m_newNumberedImplicitArgs[ImplicitArg::GET_OBJECT_ID].insert((int)callArg->getZExtValue());
        m_hasDeviceEnqueue = true;
    }
    else if (funcName == GET_BLOCK_SIMD_SIZE)
    {
        // Extract the arg num and add it to the appropriate data structure
        assert(CI.getNumArgOperands() == 1 && "get_block_simd_size function is expected to have only one argument");

        // We support only compile-time constants as arguments of get_object_id()
        ConstantInt* callArg = dyn_cast<ConstantInt>(CI.getArgOperand(0));
        assert(callArg != NULL && "get_block_simd_size function is expected to have only constant argument");

        m_newNumberedImplicitArgs[ImplicitArg::GET_BLOCK_SIMD_SIZE].insert((int)callArg->getZExtValue());
        m_hasDeviceEnqueue = true;
    }


    if (argType != ImplicitArg::NUM_IMPLICIT_ARGS)
    {

        if (std::find(m_newImplicitArgs.begin(), m_newImplicitArgs.end(), argType) == m_newImplicitArgs.end())
        {
            m_newImplicitArgs.push_back(argType);
        }

        m_hasDeviceEnqueue = true;
    }
}



char DeviceEnqueueFuncsResolution::ID = 0;

DeviceEnqueueFuncsResolution::DeviceEnqueueFuncsResolution() :
    FunctionPass(ID),
    m_Changed(false)
{
    initializeDeviceEnqueueFuncsResolutionPass(*PassRegistry::getPassRegistry());
}

bool DeviceEnqueueFuncsResolution::runOnFunction(Function& F)
{
    m_Changed = false;

    m_implicitArgs = ImplicitArgs(F, getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils());

    visit(F);

    return m_Changed;
}

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

    StringRef funcName = CI.getCalledFunction()->getName();
    Function& F = *(CI.getParent()->getParent());


    // Check for OpenCL image dimension function calls
    Value* enqueueResource = NULL;

    if (funcName == GET_DEFAULT_DEVICE_QUEUE)
    {
        enqueueResource = m_implicitArgs.getImplicitArg(F, ImplicitArg::DEVICE_ENQUEUE_DEFAULT_DEVICE_QUEUE);
        assert(enqueueResource != NULL);
    }
    else if (funcName == GET_EVENT_POOL)
    {
        enqueueResource = m_implicitArgs.getImplicitArg(F, ImplicitArg::DEVICE_ENQUEUE_EVENT_POOL);
        assert(enqueueResource != NULL);
    }
    else if (funcName == GET_MAX_WORKGROUP_SIZE)
    {
        enqueueResource = m_implicitArgs.getImplicitArg(F, ImplicitArg::DEVICE_ENQUEUE_MAX_WORKGROUP_SIZE);
        assert(enqueueResource != NULL);
    }
    else if (funcName == GET_PARENT_EVENT)
    {
        enqueueResource = m_implicitArgs.getImplicitArg(F, ImplicitArg::DEVICE_ENQUEUE_PARENT_EVENT);
        assert(enqueueResource != NULL);
    }
    else if (funcName == GET_PREFERED_WORKGROUP_MULTIPLE)
    {
        enqueueResource = m_implicitArgs.getImplicitArg(F, ImplicitArg::DEVICE_ENQUEUE_PREFERED_WORKGROUP_MULTIPLE);
        assert(enqueueResource != NULL);
    }
    else if (funcName == GET_OBJECT_ID)
    {
        enqueueResource = m_implicitArgs.getNumberedImplicitArg(F, ImplicitArg::GET_OBJECT_ID, (int)(cast<ConstantInt>(CI.getArgOperand(0))->getZExtValue()));
        assert(enqueueResource != NULL);
    }
    else if (funcName == GET_BLOCK_SIMD_SIZE)
    {
        enqueueResource = m_implicitArgs.getNumberedImplicitArg(F, ImplicitArg::GET_BLOCK_SIMD_SIZE, (int)(cast<ConstantInt>(CI.getArgOperand(0))->getZExtValue()));
        assert(enqueueResource != NULL);
    }


    if (enqueueResource != NULL)
    {
        CI.replaceAllUsesWith(enqueueResource);
        CI.eraseFromParent();

        m_Changed = true;
    }
}
