/*
Copyright (c) 2015 - present Advanced Micro Devices, Inc. All rights reserved.

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, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

#include <fstream>
#include <stdio.h>
#include <stdlib.h>
#include <cstdint>
#include <memory>
#include <mutex>
#include <string>
#include <unordered_map>
#include <vector>
#include <map>

#include <hsa/hsa.h>
#include <hsa/hsa_ext_amd.h>
#include <hsa/amd_hsa_kernel_code.h>

#include "elfio/elfio.hpp"
#include "hip/hip_runtime.h"
#include "hip_hcc_internal.h"
#include "trace_helper.h"

//TODO Add support for multiple modules
static std::unordered_map<std::string, uintptr_t> coGlobals;
//TODO Use Pool APIs from HCC to get memory regions.

#include <cassert>
inline uint64_t alignTo(uint64_t Value, uint64_t Align, uint64_t Skew = 0) {
  assert(Align != 0u && "Align can't be 0.");
  Skew %= Align;
  return (Value + Align - 1 - Skew) / Align * Align + Skew;
}

struct ihipKernArgInfo{
  std::vector<uint32_t> Size;
  std::vector<uint32_t> Align;
  std::vector<std::string> ArgType;
  std::vector<std::string> ArgName;
  uint32_t totalSize;
};

std::map<std::string,struct ihipKernArgInfo> kernelArguments;

struct MyElfNote {
  uint32_t n_namesz = 0;
  uint32_t n_descsz = 0;
  uint32_t n_type = 0;

  MyElfNote() = default;
};

struct ihipModuleSymbol_t{
    uint64_t    _object;             // The kernel object.
    uint32_t    _groupSegmentSize;
    uint32_t    _privateSegmentSize;
    std::string        _name;       // TODO - review for performance cost.  Name is just used for debug.
};

template <>
std::string ToString(hipFunction_t v)
{
    std::ostringstream ss;
    ss << "0x" << std::hex << v->_object;
    return ss.str();
};


#define CHECK_HSA(hsaStatus, hipStatus) \
if (hsaStatus != HSA_STATUS_SUCCESS) {\
    return hipStatus;\
}

#define CHECKLOG_HSA(hsaStatus, hipStatus) \
if (hsaStatus != HSA_STATUS_SUCCESS) {\
    return ihipLogStatus(hipStatus);\
}

namespace hipdrv {

    hsa_status_t findSystemRegions(hsa_region_t region, void *data){
        hsa_region_segment_t segment_id;
        hsa_region_get_info(region, HSA_REGION_INFO_SEGMENT, &segment_id);

        if(segment_id != HSA_REGION_SEGMENT_GLOBAL){
            return HSA_STATUS_SUCCESS;
        }

        hsa_region_global_flag_t flags;
        hsa_region_get_info(region, HSA_REGION_INFO_GLOBAL_FLAGS, &flags);

        hsa_region_t *reg = (hsa_region_t*)data;

        if(flags & HSA_REGION_GLOBAL_FLAG_FINE_GRAINED){
            *reg = region;
        }

        return HSA_STATUS_SUCCESS;
    }

}   // End namespace hipdrv

uint64_t PrintSymbolSizes(const void *emi, const char *name){
    using namespace ELFIO;

    const Elf64_Ehdr *ehdr = (const Elf64_Ehdr*)emi;
    if(NULL == ehdr || EV_CURRENT != ehdr->e_version){}
    const Elf64_Shdr * shdr = (const Elf64_Shdr*)((char*)emi + ehdr->e_shoff);
    for(uint16_t i=0;i<ehdr->e_shnum;++i){
        if(shdr[i].sh_type == SHT_SYMTAB){
            const Elf64_Sym *syms = (const Elf64_Sym*)((char*)emi + shdr[i].sh_offset);
            assert(syms);
            uint64_t numSyms = shdr[i].sh_size/shdr[i].sh_entsize;
            const char* strtab = (const char*)((char*)emi + shdr[shdr[i].sh_link].sh_offset);
            assert(strtab);
            for(uint64_t i=0;i<numSyms;++i){
                const char *symname = strtab + syms[i].st_name;
                assert(symname);
                uint64_t size = syms[i].st_size;
                if(strcmp(name, symname) == 0){
                    return size;
                }
            }
        }
    }
    return 0;
}

uint64_t ElfSize(const void *emi){
    using namespace ELFIO;

    const Elf64_Ehdr *ehdr = (const Elf64_Ehdr*)emi;
    const Elf64_Shdr *shdr = (const Elf64_Shdr*)((char*)emi + ehdr->e_shoff);

    uint64_t max_offset = ehdr->e_shoff;
    uint64_t total_size = max_offset + ehdr->e_shentsize * ehdr->e_shnum;

    for(uint16_t i=0;i < ehdr->e_shnum;++i){
        uint64_t cur_offset = static_cast<uint64_t>(shdr[i].sh_offset);
        if(max_offset < cur_offset){
            max_offset = cur_offset;
            total_size = max_offset;
            if(SHT_NOBITS != shdr[i].sh_type){
                total_size += static_cast<uint64_t>(shdr[i].sh_size);
            }
        }
    }
    return total_size;
}

namespace
{
    template<typename P>
    inline
    ELFIO::section* find_section_if(ELFIO::elfio& reader, P p)
    {
        using namespace std;

        const auto it = find_if(
            reader.sections.begin(), reader.sections.end(), move(p));

        return it != reader.sections.end() ? *it : nullptr;
    }

    inline
    std::vector<std::string> copy_names_of_undefined_symbols(
        const ELFIO::symbol_section_accessor& section)
    {
        using namespace ELFIO;
        using namespace std;

        vector<string> r;

        for (auto i = 0u; i != section.get_symbols_num(); ++i) {
            // TODO: this is boyscout code, caching the temporaries
            //       may be of worth.
            string name;
            Elf64_Addr value = 0;
            Elf_Xword size = 0;
            Elf_Half sect_idx = 0;
            uint8_t bind = 0;
            uint8_t type = 0;
            uint8_t other = 0;

            section.get_symbol(
                i, name, value, size, bind, type, sect_idx, other);

            if (sect_idx == SHN_UNDEF && !name.empty()) {
                r.push_back(std::move(name));
            }
        }

        return r;
    }

    inline
    std::pair<ELFIO::Elf64_Addr, ELFIO::Elf_Xword> find_symbol_address(
        const ELFIO::symbol_section_accessor& section,
        const std::string& symbol_name)
    {
        using namespace ELFIO;
        using namespace std;

        static const pair<Elf64_Addr, Elf_Xword> r{0, 0};

        for (auto i = 0u; i != section.get_symbols_num(); ++i) {
            // TODO: this is boyscout code, caching the temporaries
            //       may be of worth.
            string name;
            Elf64_Addr value = 0;
            Elf_Xword size = 0;
            Elf_Half sect_idx = 0;
            uint8_t bind = 0;
            uint8_t type = 0;
            uint8_t other = 0;

            section.get_symbol(
                i, name, value, size, bind, type, sect_idx, other);

            if (name == symbol_name) return make_pair(value, size);
        }

        return r;
    }

    inline
    void associate_code_object_symbols_with_host_allocation(
        const ELFIO::elfio& reader,
        const ELFIO::elfio& self_reader,
        ELFIO::section* code_object_dynsym,
        ELFIO::section* process_symtab,
        hsa_agent_t agent,
        hsa_executable_t executable)
    {
        using namespace ELFIO;
        using namespace std;

        if (!code_object_dynsym || !process_symtab) return;

        const auto undefined_symbols = copy_names_of_undefined_symbols(
            symbol_section_accessor{reader, code_object_dynsym});

        for (auto&& x : undefined_symbols) {
            const auto tmp = find_symbol_address(
                symbol_section_accessor{self_reader, process_symtab}, x);

            assert(tmp.first);
            if (coGlobals.count(x) == 0) {
                coGlobals.emplace(x, tmp.first);
            }
            void* p = nullptr;
            hsa_amd_memory_lock(
                reinterpret_cast<void*>(tmp.first), tmp.second, &agent, 1, &p);

            hsa_executable_agent_global_variable_define(
                executable, agent, x.c_str(), p);

            static vector<
                unique_ptr<void, decltype(hsa_amd_memory_unlock)*>> globals;
            static mutex mtx;

            lock_guard<std::mutex> lck{mtx};
            globals.emplace_back(p, hsa_amd_memory_unlock);
        }
    }

    inline
    void load_code_object_and_freeze_executable(
        const char* file, hsa_agent_t agent, hsa_executable_t executable)
    {   // TODO: the following sequence is inefficient, should be refactored
        //       into a single load of the file and subsequent ELFIO
        //       processing.
        using namespace std;

        static const auto cor_deleter = [](hsa_code_object_reader_t* p) {
            hsa_code_object_reader_destroy(*p);
        };

        using RAII_code_reader = unique_ptr<
            hsa_code_object_reader_t, decltype(cor_deleter)>;

        unique_ptr<FILE, decltype(fclose)*> cobj{fopen(file, "r"), fclose};
        RAII_code_reader tmp{new hsa_code_object_reader_t, cor_deleter};
        hsa_code_object_reader_create_from_file(fileno(cobj.get()), tmp.get());

        hsa_executable_load_agent_code_object(
            executable, agent, *tmp, nullptr, nullptr);

        hsa_executable_freeze(executable, nullptr);

        static vector<RAII_code_reader> code_readers;
        static mutex mtx;

        lock_guard<mutex> lck{mtx};
        code_readers.push_back(move(tmp));
    }
}

hipError_t hipModuleLoad(hipModule_t *module, const char *fname)
{
    using namespace ELFIO;

    HIP_INIT_API(module, fname);
    hipError_t ret = hipSuccess;
    *module = new ihipModule_t;

    if(module == NULL){
        return ihipLogStatus(hipErrorInvalidValue);
    }

    auto ctx = ihipGetTlsDefaultCtx();
    if(ctx == nullptr){
        ret = hipErrorInvalidContext;

    }else{
        int deviceId = ctx->getDevice()->_deviceId;
        ihipDevice_t *currentDevice = ihipGetDevice(deviceId);

        hsa_executable_create_alt(
            HSA_PROFILE_FULL,
            HSA_DEFAULT_FLOAT_ROUNDING_MODE_DEFAULT,
            nullptr,
            &(*module)->executable);

        elfio reader;
        if (!reader.load(fname)) {
            return ihipLogStatus(hipErrorFileNotFound);
        }
        else {
            // TODO: this may benefit from caching as well.
            elfio self_reader;
            self_reader.load("/proc/self/exe");

            const auto symtab =
                find_section_if(self_reader, [](const ELFIO::section* x) {
                    return x->get_type() == SHT_SYMTAB;
                });

            const auto code_object_dynsym =
                find_section_if(reader, [](const ELFIO::section* x) {
                    return x->get_type() == SHT_DYNSYM;
                });

            associate_code_object_symbols_with_host_allocation(
                reader,
                self_reader,
                code_object_dynsym,
                symtab,
                currentDevice->_hsaAgent,
                (*module)->executable);

            load_code_object_and_freeze_executable(
                fname, currentDevice->_hsaAgent, (*module)->executable);
        }
    }

    return ihipLogStatus(ret);
}


hipError_t hipModuleUnload(hipModule_t hmod)
{
    HIP_INIT_API(hmod);

    // TODO - improve this synchronization so it is thread-safe.
    // Currently we want for all inflight activity to complete, but don't prevent another
    // thread from launching new kernels before we finish this operation.
    ihipSynchronize();
    hipError_t ret = hipSuccess;
    hsa_status_t status = hsa_executable_destroy(hmod->executable);
    if(status != HSA_STATUS_SUCCESS)
		{
				ret = hipErrorInvalidValue;
		}
    // status = hsa_code_object_destroy(hmod->object);
    // if(status != HSA_STATUS_SUCCESS)
	// 	{
	// 			ret = hipErrorInvalidValue;
	// 	}
    // status = hsa_memory_free(hmod->ptr);
    // if(status != HSA_STATUS_SUCCESS)
	// 	{
	// 			ret = hipErrorInvalidValue;
	// 	}
    for(auto f = hmod->funcTrack.begin(); f != hmod->funcTrack.end(); ++f) {
      delete *f;
    }
    delete hmod;
    return ihipLogStatus(ret);
}


hipError_t ihipModuleGetSymbol(hipFunction_t *func, hipModule_t hmod, const char *name)
{
    auto ctx = ihipGetTlsDefaultCtx();
    hipError_t ret = hipSuccess;

    if (name == nullptr){
        return (hipErrorInvalidValue);
    }

    if (ctx == nullptr){
        ret = hipErrorInvalidContext;

    } else {
        std::string str(name);
        for(auto f = hmod->funcTrack.begin(); f != hmod->funcTrack.end(); ++f) {
            if((*f)->_name == str) {
                *func = *f;
                return ret;
            }
        }
        ihipModuleSymbol_t *sym = new ihipModuleSymbol_t;
        int deviceId = ctx->getDevice()->_deviceId;
        ihipDevice_t *currentDevice = ihipGetDevice(deviceId);
        hsa_agent_t gpuAgent = (hsa_agent_t)currentDevice->_hsaAgent;

        hsa_status_t status;
        hsa_executable_symbol_t 	symbol;
        status = hsa_executable_get_symbol(hmod->executable, NULL, name, gpuAgent, 0, &symbol);
        if(status != HSA_STATUS_SUCCESS){
            return hipErrorNotFound;
        }

        status = hsa_executable_symbol_get_info(symbol,
                                   HSA_EXECUTABLE_SYMBOL_INFO_KERNEL_OBJECT,
                                   &sym->_object);
        CHECK_HSA(status, hipErrorNotFound);

        status = hsa_executable_symbol_get_info(symbol,
                                    HSA_EXECUTABLE_SYMBOL_INFO_KERNEL_GROUP_SEGMENT_SIZE,
                                    &sym->_groupSegmentSize);
        CHECK_HSA(status, hipErrorNotFound);

        status = hsa_executable_symbol_get_info(symbol,
                                    HSA_EXECUTABLE_SYMBOL_INFO_KERNEL_PRIVATE_SEGMENT_SIZE,
                                    &sym->_privateSegmentSize);
        CHECK_HSA(status, hipErrorNotFound);

        sym->_name = name;
        *func = sym;
        hmod->funcTrack.push_back(*func);
    }
    return ret;
}


hipError_t hipModuleGetFunction(hipFunction_t *hfunc, hipModule_t hmod,
                                const char *name){
    HIP_INIT_API(hfunc, hmod, name);
    return ihipLogStatus(ihipModuleGetSymbol(hfunc, hmod, name));
}


hipError_t ihipModuleLaunchKernel(hipFunction_t f,
                                  uint32_t globalWorkSizeX, uint32_t globalWorkSizeY, uint32_t globalWorkSizeZ,
                                  uint32_t localWorkSizeX, uint32_t localWorkSizeY, uint32_t localWorkSizeZ,
                                  size_t sharedMemBytes, hipStream_t hStream,
                                  void **kernelParams, void **extra,
                                  hipEvent_t startEvent, hipEvent_t stopEvent)
{

    auto ctx = ihipGetTlsDefaultCtx();
    hipError_t ret = hipSuccess;

    if(ctx == nullptr){
        ret = hipErrorInvalidDevice;

    }else{
        int deviceId = ctx->getDevice()->_deviceId;
        ihipDevice_t *currentDevice = ihipGetDevice(deviceId);
        hsa_agent_t gpuAgent = (hsa_agent_t)currentDevice->_hsaAgent;

        void *config[5] = {0};
        size_t kernArgSize;

        if(kernelParams != NULL){
          std::string name = f->_name;
          struct ihipKernArgInfo pl = kernelArguments[name];
          char* argBuf = (char*)malloc(pl.totalSize);
          memset(argBuf, 0, pl.totalSize);
          int index = 0;
          for(int i=0;i<pl.Size.size();i++){
            memcpy(argBuf + index, kernelParams[i], pl.Size[i]);
            index += pl.Align[i];
          }
          config[1] = (void*)argBuf;
          kernArgSize = pl.totalSize;
        } else if(extra != NULL){
            memcpy(config, extra, sizeof(size_t)*5);
            if(config[0] == HIP_LAUNCH_PARAM_BUFFER_POINTER && config[2] == HIP_LAUNCH_PARAM_BUFFER_SIZE && config[4] == HIP_LAUNCH_PARAM_END){
                kernArgSize = *(size_t*)(config[3]);
            } else {
                return hipErrorNotInitialized;
            }

        }else{
            return hipErrorInvalidValue;
        }



        /*
          Kernel argument preparation.
        */
        grid_launch_parm lp;
        lp.dynamic_group_mem_bytes = sharedMemBytes;  // TODO - this should be part of preLaunchKernel.
        hStream = ihipPreLaunchKernel(hStream, dim3(globalWorkSizeX, globalWorkSizeY, globalWorkSizeZ), dim3(localWorkSizeX, localWorkSizeY, localWorkSizeZ), &lp, f->_name.c_str());


        hsa_kernel_dispatch_packet_t aql;

        memset(&aql, 0, sizeof(aql));

        //aql.completion_signal._handle = 0;
        //aql.kernarg_address = 0;

        aql.workgroup_size_x = localWorkSizeX;
        aql.workgroup_size_y = localWorkSizeY;
        aql.workgroup_size_z = localWorkSizeZ;
        aql.grid_size_x = globalWorkSizeX;
        aql.grid_size_y = globalWorkSizeY;
        aql.grid_size_z = globalWorkSizeZ;
        aql.group_segment_size = f->_groupSegmentSize + sharedMemBytes;
        aql.private_segment_size = f->_privateSegmentSize;
        aql.kernel_object = f->_object;
        aql.setup = 3 << HSA_KERNEL_DISPATCH_PACKET_SETUP_DIMENSIONS;
        aql.header =   (HSA_PACKET_TYPE_KERNEL_DISPATCH << HSA_PACKET_HEADER_TYPE) |
                       (1 << HSA_PACKET_HEADER_BARRIER);  // TODO - honor queue setting for execute_in_order

        if (HCC_OPT_FLUSH) {
            aql.header |= (HSA_FENCE_SCOPE_AGENT << HSA_PACKET_HEADER_ACQUIRE_FENCE_SCOPE) |
                          (HSA_FENCE_SCOPE_AGENT << HSA_PACKET_HEADER_RELEASE_FENCE_SCOPE);
        } else {
            aql.header |= (HSA_FENCE_SCOPE_SYSTEM << HSA_PACKET_HEADER_ACQUIRE_FENCE_SCOPE) |
                          (HSA_FENCE_SCOPE_SYSTEM << HSA_PACKET_HEADER_RELEASE_FENCE_SCOPE);
        };


        hc::completion_future cf;

        lp.av->dispatch_hsa_kernel(&aql, config[1] /* kernarg*/, kernArgSize,
                                  (startEvent || stopEvent) ? &cf : nullptr
#if (__hcc_workweek__ > 17312)
                                  , f->_name.c_str()
#endif
                                  );



        if (startEvent) {
            startEvent->attachToCompletionFuture(&cf, hStream, hipEventTypeStartCommand);
        }
        if (stopEvent) {
            stopEvent->attachToCompletionFuture (&cf, hStream, hipEventTypeStopCommand);
        }


        if(kernelParams != NULL){
          free(config[1]);
        }
        ihipPostLaunchKernel(f->_name.c_str(), hStream, lp);
    }

    return ret;
}

hipError_t hipModuleLaunchKernel(hipFunction_t f,
            uint32_t gridDimX, uint32_t gridDimY, uint32_t gridDimZ,
            uint32_t blockDimX, uint32_t blockDimY, uint32_t blockDimZ,
            uint32_t sharedMemBytes, hipStream_t hStream,
            void **kernelParams, void **extra)
{
    HIP_INIT_API(f, gridDimX, gridDimY, gridDimZ,
                 blockDimX, blockDimY, blockDimZ,
                 sharedMemBytes, hStream,
                 kernelParams, extra);
    return ihipLogStatus(ihipModuleLaunchKernel(f,
                blockDimX * gridDimX, blockDimY * gridDimY, gridDimZ * blockDimZ,
                blockDimX, blockDimY, blockDimZ,
                sharedMemBytes, hStream, kernelParams, extra,
                nullptr, nullptr));
}


hipError_t hipHccModuleLaunchKernel(hipFunction_t f,
            uint32_t globalWorkSizeX, uint32_t globalWorkSizeY, uint32_t globalWorkSizeZ,
            uint32_t localWorkSizeX, uint32_t localWorkSizeY, uint32_t localWorkSizeZ,
            size_t sharedMemBytes, hipStream_t hStream,
            void **kernelParams, void **extra,
            hipEvent_t startEvent, hipEvent_t stopEvent)
{
    HIP_INIT_API(f, globalWorkSizeX, globalWorkSizeY, globalWorkSizeZ,
                 localWorkSizeX, localWorkSizeY, localWorkSizeZ,
                 sharedMemBytes, hStream,
                 kernelParams, extra);
    return ihipLogStatus(ihipModuleLaunchKernel(f, globalWorkSizeX, globalWorkSizeY, globalWorkSizeZ,
                localWorkSizeX, localWorkSizeY, localWorkSizeZ,
                sharedMemBytes, hStream, kernelParams, extra, startEvent, stopEvent));
}

namespace
{
    struct Agent_global {
        std::string name;
        hipDeviceptr_t address;
        std::uint32_t byte_cnt;
    };

    inline
    void* address(hsa_executable_symbol_t x)
    {
        void* r = nullptr;
        hsa_executable_symbol_get_info(
            x, HSA_EXECUTABLE_SYMBOL_INFO_VARIABLE_ADDRESS, &r);

        return r;
    }

    inline
    std::string name(hsa_executable_symbol_t x)
    {
        uint32_t sz = 0u;
        hsa_executable_symbol_get_info(
            x, HSA_EXECUTABLE_SYMBOL_INFO_NAME_LENGTH, &sz);

        std::string r(sz, '\0');
        hsa_executable_symbol_get_info(
            x, HSA_EXECUTABLE_SYMBOL_INFO_NAME, &r.front());

        return r;
    }

    inline
    std::uint32_t size(hsa_executable_symbol_t x)
    {
        std::uint32_t r = 0;
        hsa_executable_symbol_get_info(
            x, HSA_EXECUTABLE_SYMBOL_INFO_VARIABLE_SIZE, &r);

        return r;
    }

    inline
    void track(const Agent_global& x)
    {
        tprintf(
            DB_MEM,
            "  add variable '%s' with ptr=%p size=%u to tracker\n",
            x.name.c_str(),
            x.address,
            x.byte_cnt);

        auto device = ihipGetTlsDefaultCtx()->getWriteableDevice();

        hc::AmPointerInfo ptr_info(
            nullptr,
            x.address,
            x.address,
            x.byte_cnt,
            device->_acc,
            true,
            false);
        hc::am_memtracker_add(x.address, ptr_info);
        hc::am_memtracker_update(x.address, device->_deviceId, 0u);
    }

    template<typename Container = std::vector<Agent_global>>
    inline
    hsa_status_t copy_agent_global_variables(
        hsa_executable_t, hsa_agent_t, hsa_executable_symbol_t x, void* out)
    {
        assert(out);

        hsa_symbol_kind_t t = {};
        hsa_executable_symbol_get_info(x, HSA_EXECUTABLE_SYMBOL_INFO_TYPE, &t);

        if (t == HSA_SYMBOL_KIND_VARIABLE) {
            static_cast<Container*>(out)->push_back(
                Agent_global{name(x), address(x), size(x)});

            track(static_cast<Container*>(out)->back());
        }

        return HSA_STATUS_SUCCESS;
    }

    inline
    hsa_agent_t this_agent()
    {
        auto ctx = ihipGetTlsDefaultCtx();

        if (!ctx) throw std::runtime_error{"No active HIP context."};

        auto device = ctx->getDevice();

        if (!device) throw std::runtime_error{"No device available for HIP."};

        ihipDevice_t *currentDevice = ihipGetDevice(device->_deviceId);

        if (!currentDevice) {
            throw std::runtime_error{"No active device for HIP"};
        }

        return currentDevice->_hsaAgent;
    }

    inline
    std::vector<Agent_global> read_agent_globals(hipModule_t hmodule)
    {
        std::vector<Agent_global> r;


        hsa_executable_iterate_agent_symbols(
            hmodule->executable, this_agent(), copy_agent_global_variables, &r);

        return r;
    }
}

hipError_t hipModuleGetGlobal(hipDeviceptr_t *dptr, size_t *bytes,
                              hipModule_t hmod, const char* name)
{
    HIP_INIT_API(dptr, bytes, hmod, name);
    hipError_t ret = hipSuccess;
    if(dptr == NULL || bytes == NULL){
        return ihipLogStatus(hipErrorInvalidValue);
    }
    if(name == NULL || hmod == NULL){
        return ihipLogStatus(hipErrorNotInitialized);
    }
    else{
        static std::unordered_map<
            hipModule_t, std::vector<Agent_global>> agent_globals;

        // TODO: this is not particularly robust.
        if (agent_globals.count(hmod) == 0) {
            static std::mutex mtx;
            std::lock_guard<std::mutex> lck{mtx};

            if (agent_globals.count(hmod) == 0) {
                agent_globals.emplace(hmod, read_agent_globals(hmod));
            }
        }

        // TODO: This is unsafe iff some other emplacement triggers rehashing.
        //       It will have to be properly fleshed out in the future.
        const auto it0 = agent_globals.find(hmod);
        if (it0 == agent_globals.cend()) {
            throw std::runtime_error{"agent_globals data structure corrupted."};
        }

        const auto it1 = std::find_if(
            it0->second.cbegin(),
            it0->second.cend(),
            [=](const Agent_global& x) { return x.name == name; });

        if (it1 == it0->second.cend()) return ihipLogStatus(hipErrorNotFound);

        *dptr = it1->address;
        *bytes = it1->byte_cnt;

        return ihipLogStatus(hipSuccess);
    }
}

hipError_t hipModuleLoadData(hipModule_t *module, const void *image)
{
    HIP_INIT_API(module, image);
    hipError_t ret = hipSuccess;
    if(image == NULL || module == NULL){
        return ihipLogStatus(hipErrorNotInitialized);
    } else {
        auto ctx = ihipGetTlsDefaultCtx();
        *module = new ihipModule_t;
        int deviceId = ctx->getDevice()->_deviceId;
        ihipDevice_t *currentDevice = ihipGetDevice(deviceId);

        void *p;
        uint64_t size = ElfSize(image);
        hsa_agent_t agent = currentDevice->_hsaAgent;
        hsa_region_t sysRegion;
        hsa_status_t status = hsa_agent_iterate_regions(agent, hipdrv::findSystemRegions, &sysRegion);
        status = hsa_memory_allocate(sysRegion, size, (void**)&p);

        if(status != HSA_STATUS_SUCCESS){
            return ihipLogStatus(hipErrorOutOfMemory);
        }

        char *ptr = (char*)p;
        if(!ptr){
           return ihipLogStatus(hipErrorOutOfMemory);
        }
        (*module)->ptr = p;
        (*module)->size = size;

        memcpy(ptr, image, size);

        status = hsa_code_object_deserialize(ptr, size, NULL, &(*module)->object);

        if(status != HSA_STATUS_SUCCESS){
            return ihipLogStatus(hipErrorSharedObjectInitFailed);
        }

        status = hsa_executable_create(HSA_PROFILE_FULL, HSA_EXECUTABLE_STATE_UNFROZEN, NULL, &(*module)->executable);
        CHECKLOG_HSA(status, hipErrorNotInitialized);

        status = hsa_executable_load_code_object((*module)->executable, agent, (*module)->object, NULL);
        CHECKLOG_HSA(status, hipErrorNotInitialized);

        status = hsa_executable_freeze((*module)->executable, NULL);
        CHECKLOG_HSA(status, hipErrorNotInitialized);
    }
    return ihipLogStatus(ret);
}

hipError_t hipModuleLoadDataEx(hipModule_t *module, const void *image, unsigned int numOptions, hipJitOption *options, void **optionValues)
{
    return hipModuleLoadData(module, image);
}

hipError_t hipModuleGetTexRef(textureReference** texRef, hipModule_t hmod, const char* name)
{
    HIP_INIT_API(texRef, hmod, name);
    hipError_t ret = hipSuccess;
    if(texRef == NULL){
        return ihipLogStatus(hipErrorInvalidValue);
    }
    if(name == NULL || hmod == NULL){
        return ihipLogStatus(hipErrorNotInitialized);
    }
    else{
        const auto it = coGlobals.find(name);
		if (it == coGlobals.end()) return ihipLogStatus(hipErrorInvalidValue);
		*texRef = reinterpret_cast<textureReference*>(it->second);
		return ihipLogStatus(ret);
    }
}