/*
Copyright (c) 2015 - 2021 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.
*/
#define LLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING 1
#include "llvm/BinaryFormat/ELF.h"
#if defined(_WIN32)
#if defined(__has_attribute)
// MS compiler doesn't support __has_attribute
#undef __has_attribute
#endif
#endif
#include "hip_code_object.hpp"
#include "hip_comgr_helper.hpp"
using namespace llvm::ELF;

namespace hip {
hipError_t ihipFree(void* ptr);
// forward declaration of methods required for managed variables
hipError_t ihipMallocManaged(void** ptr, size_t size, size_t align = 0, bool use_host_ptr = 0);

hipError_t DynCO::loadCodeObject(const char* fname, const void* image) {
  amd::ScopedLock lock(dclock_);

  // Number of devices = 1 in dynamic code object
  fb_info_ = new FatBinaryInfo(fname, image);
  std::vector<hip::Device*> devices = {g_devices[ihipGetDevice()]};
  IHIP_RETURN_ONFAIL(fb_info_->ExtractFatBinaryUsingCOMGR(devices));

  // No Lazy loading for DynCO
  IHIP_RETURN_ONFAIL(fb_info_->BuildProgram(ihipGetDevice()));

  module_ = fb_info_->Module(device_id_);

  // Define Global variables
  IHIP_RETURN_ONFAIL(populateDynGlobalVars());

  // Define Global functions
  IHIP_RETURN_ONFAIL(populateDynGlobalFuncs());

  return hipSuccess;
}

// Dynamic Code Object
DynCO::~DynCO() {
  amd::ScopedLock lock(dclock_);

  for (auto& elem : vars_) {
    if (elem.second->getVarKind() == Var::DVK_Managed) {
      hipError_t err = ihipFree(elem.second->getManagedVarPtr());
      assert(err == hipSuccess);
    }

    if (elem.second->getVarKind() == Var::DVK_Variable) {
      for (auto dev : g_devices) {
        DeviceVar* dvar = nullptr;
        hipError_t err = elem.second->getDeviceVarPtr(&dvar, dev->deviceId());
        assert(err == hipSuccess);
        if (dvar != nullptr) {
          // free also deletes the device ptr
          err = ihipFree(dvar->device_ptr());
          assert(err == hipSuccess);
        }
      }
    }
    delete elem.second;
  }
  vars_.clear();

  for (auto& elem : functions_) {
    delete elem.second;
  }
  functions_.clear();

  delete fb_info_;
}

hipError_t DynCO::getDeviceVar(DeviceVar** dvar, std::string var_name) {
  amd::ScopedLock lock(dclock_);

  auto it = vars_.find(var_name);
  if (it == vars_.end()) {
    LogPrintfError("Cannot find the Var: %s ", var_name.c_str());
    return hipErrorNotFound;
  }

  hipError_t err = it->second->getDeviceVar(dvar, device_id_, module_);
  return err;
}

hipError_t DynCO::getDynFunc(hipFunction_t* hfunc, std::string func_name) {
  amd::ScopedLock lock(dclock_);

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

  auto it = functions_.find(func_name);
  if (it == functions_.end()) {
    LogPrintfError("Cannot find the function: %s ", func_name.c_str());
    return hipErrorNotFound;
  }

  /* See if this could be solved */
  return it->second->getDynFunc(hfunc, module_);
}

bool DynCO::isValidDynFunc(const void* hfunc) {
  amd::ScopedLock lock(dclock_);
  return std::any_of(functions_.begin(), functions_.end(),
                     [&](auto& it) { return it.second->isValidDynFunc(hfunc); });
}

hipError_t DynCO::initDynManagedVars(const std::string& managedVar) {
  amd::ScopedLock lock(dclock_);
  DeviceVar* dvar;
  void* pointer = nullptr;
  hipError_t status = hipSuccess;
  // To get size of the managed variable
  status = getDeviceVar(&dvar, managedVar + ".managed");
  if (status != hipSuccess) {
    ClPrint(amd::LOG_ERROR, amd::LOG_API, "Status %d, failed to get .managed device variable:%s",
            status, managedVar.c_str());
    return status;
  }
  // Allocate managed memory for these symbols
  status = ihipMallocManaged(&pointer, dvar->size(), 0, 0);
  guarantee(status == hipSuccess, "Status %d, failed to allocate managed memory", status);

  // update as manager variable and set managed memory pointer and size
  auto it = vars_.find(managedVar);
  it->second->setManagedVarInfo(pointer, dvar->size());

  // copy initial value to the managed variable to the managed memory allocated
  hip::Stream* stream = hip::getNullStream();
  if (stream != nullptr) {
    status = ihipMemcpy(pointer, reinterpret_cast<address>(dvar->device_ptr()), dvar->size(),
                        hipMemcpyDeviceToDevice, *stream);
    if (status != hipSuccess) {
      ClPrint(amd::LOG_ERROR, amd::LOG_API, "Status %d, failed to copy device ptr:%s", status,
              managedVar.c_str());
      return status;
    }
  } else {
    ClPrint(amd::LOG_ERROR, amd::LOG_API, "Host Queue is NULL");
    return hipErrorInvalidResourceHandle;
  }

  // Get deivce ptr to initialize with managed memory pointer
  status = getDeviceVar(&dvar, managedVar);
  if (status != hipSuccess) {
    ClPrint(amd::LOG_ERROR, amd::LOG_API, "Status %d, failed to get managed device variable:%s",
            status, managedVar.c_str());
    return status;
  }
  // copy managed memory pointer to the managed device variable
  status = ihipMemcpy(reinterpret_cast<address>(dvar->device_ptr()), &pointer, dvar->size(),
                      hipMemcpyHostToDevice, *stream);
  if (status != hipSuccess) {
    ClPrint(amd::LOG_ERROR, amd::LOG_API, "Status %d, failed to copy device ptr:%s", status,
            managedVar.c_str());
    return status;
  }
  return status;
}

hipError_t DynCO::populateDynGlobalVars() {
  amd::ScopedLock lock(dclock_);
  hipError_t err = hipSuccess;
  std::vector<std::string> var_names;
  std::string managedVarExt = ".managed";
  // For Dynamic Modules there is only one hipFatBinaryDevInfo_
  device::Program* dev_program = fb_info_->GetProgram(ihipGetDevice())
                                     ->getDeviceProgram(*hip::getCurrentDevice()->devices()[0]);

  if (!dev_program->getGlobalVarFromCodeObj(&var_names)) {
    LogPrintfError("Could not get Global vars from Code Obj for Module: 0x%x", module_);
    return hipErrorSharedObjectSymbolNotFound;
  }

  for (auto& elem : var_names) {
    vars_.insert(
        std::make_pair(elem, new Var(elem, Var::DeviceVarKind::DVK_Variable, 0, 0, 0, nullptr)));
  }

  for (auto& elem : var_names) {
    if (elem.find(managedVarExt) != std::string::npos) {
      std::string managedVar = elem;
      managedVar.erase(managedVar.length() - managedVarExt.length(), managedVarExt.length());
      err = initDynManagedVars(managedVar);
    }
  }
  return err;
}

hipError_t DynCO::populateDynGlobalFuncs() {
  amd::ScopedLock lock(dclock_);

  std::vector<std::string> func_names;
  device::Program* dev_program = fb_info_->GetProgram(ihipGetDevice())
                                     ->getDeviceProgram(*hip::getCurrentDevice()->devices()[0]);

  // Get all the global func names from COMGR
  if (!dev_program->getGlobalFuncFromCodeObj(&func_names)) {
    LogPrintfError("Could not get Global Funcs from Code Obj for Module: 0x%x", module_);
    return hipErrorSharedObjectSymbolNotFound;
  }

  for (auto& elem : func_names) {
    functions_.insert(std::make_pair(elem, new Function(elem)));
  }

  return hipSuccess;
}

// Static Code Object
StatCO::StatCO() {}

StatCO::~StatCO() {
  amd::ScopedLock lock(sclock_);

  for (auto& elem : functions_) {
    delete elem.second;
  }
  functions_.clear();

  for (auto& elem : vars_) {
    delete elem.second;
  }
  vars_.clear();
}

hipError_t StatCO::digestFatBinary(const void* data, FatBinaryInfo*& programs) {
  amd::ScopedLock lock(sclock_);

  if (programs != nullptr) {
    return hipSuccess;
  }

  // Create a new fat binary object and extract the fat binary for all devices.
  FatBinaryInfo* fatBinaryInfo = new FatBinaryInfo(nullptr, data);
  hipError_t err = fatBinaryInfo->ExtractFatBinaryUsingCOMGR(g_devices);
  programs = fatBinaryInfo;
  return err;
}

FatBinaryInfo** StatCO::addFatBinary(const void* data, bool initialized, bool& success) {
  amd::ScopedLock lock(sclock_);
  module_to_hostModule_.insert(std::make_pair(&modules_[data], data));

  if (initialized == false) {
    success = true;
    return &modules_[data];
  }

  hipError_t err = digestFatBinary(data, modules_[data]);

  success = (err == hipSuccess);
  return &modules_[data];
}

hipError_t StatCO::removeFatBinary(FatBinaryInfo** module) {
  amd::ScopedLock lock(sclock_);

  auto hostVarsIter = module_to_hostVars_.find(module);
  if (hostVarsIter != module_to_hostVars_.end()) {
    for (auto& hostVar : hostVarsIter->second) {
      auto varIter = vars_.find(hostVar);
      if (varIter == vars_.end()) {
        LogPrintfError("removeFatBinary: Unable to find module 0x%x hostVar 0x%x", module, hostVar);
      } else {
        delete varIter->second;
        vars_.erase(varIter);
      }
    }
    module_to_hostVars_.erase(hostVarsIter);
  }

  auto managedVarsIter = managedVars_.find(module);
  if (managedVarsIter != managedVars_.end()) {
    for (auto& managedVar : managedVarsIter->second) {
      hipError_t err = hipSuccess;
      for (auto dev : g_devices) {
        DeviceVar* dvar = nullptr;
        IHIP_RETURN_ONFAIL(managedVar->getDeviceVarPtr(&dvar, dev->deviceId()));
        if (dvar != nullptr) {
          // free also deletes the device ptr
          err = ihipFree(dvar->device_ptr());
          assert(err == hipSuccess);
        }
      }
      if (managedVar->getAllocFlag()) {  // check if it is a managed or host alloc
        err = ihipFree(*(static_cast<void**>(managedVar->getManagedVarPtr())));
      } else {
        void** pointer = static_cast<void**>(managedVar->getManagedVarPtr());
        amd::Os::releaseMemory(*pointer, managedVar->getSize());
      }
      assert(err == hipSuccess);
      delete managedVar;
    }
    managedVars_.erase(managedVarsIter);
  }

  auto hostFuncsIter = module_to_hostFunctions_.find(module);
  if (hostFuncsIter != module_to_hostFunctions_.end()) {
    for (auto& hostFunc : hostFuncsIter->second) {
      auto funcIter = functions_.find(hostFunc);
      if (funcIter == functions_.end()) {
        LogPrintfError("removeFatBinary: Unable to find module 0x%x hostFunc 0x%x", module,
                       hostFunc);
      } else {
        delete funcIter->second;
        functions_.erase(funcIter);
      }
    }
    module_to_hostFunctions_.erase(hostFuncsIter);
  }

  auto hostModuleIter = module_to_hostModule_.find(module);
  if (hostModuleIter != module_to_hostModule_.end()) {
    auto hostModule = hostModuleIter->second;
    auto moduleIter = modules_.find(hostModule);
    if (moduleIter != modules_.end()) {
      delete moduleIter->second;
      modules_.erase(moduleIter);
    } else {
      LogPrintfError("removeFatBinary: Unable to find module 0x%x via hostModule 0x%x", module,
                     hostModule);
    }
    module_to_hostModule_.erase(hostModuleIter);
  }

  return hipSuccess;
}

hipError_t StatCO::registerStatFunction(const void* hostFunction, Function* func) {
  amd::ScopedLock lock(sclock_);

  if (functions_.find(hostFunction) != functions_.end()) {
    DevLogPrintfError("hostFunctionPtr: 0x%x already exists", hostFunction);
    delete func;
  } else {
    functions_.insert(std::make_pair(hostFunction, func));
    module_to_hostFunctions_[func->moduleInfo()].push_back(hostFunction);
  }

  return hipSuccess;
}

const char* StatCO::getStatFuncName(const void* hostFunction) {
  amd::ScopedLock lock(sclock_);

  const auto it = functions_.find(hostFunction);
  if (it == functions_.end()) {
    return nullptr;
  }
  return it->second->name().c_str();
}

hipError_t StatCO::getStatFunc(hipFunction_t* hfunc, const void* hostFunction, int deviceId) {
  const auto it = functions_.find(hostFunction);
  if (it == functions_.end()) {
    return hipErrorInvalidSymbol;
  }

  // Lazy load
  FatBinaryInfo** module = it->second->moduleInfo();
  if (*(module) == nullptr) {
    amd::ScopedLock lock(sclock_);
    if (*(module) == nullptr) {
      hipError_t err = digestFatBinary(module_to_hostModule_[module], *module);
      assert(err == hipSuccess);
    }
  }

  return it->second->getStatFunc(hfunc, deviceId);
}

hipError_t StatCO::getStatFuncAttr(hipFuncAttributes* func_attr, const void* hostFunction,
                                   int deviceId) {
  amd::ScopedLock lock(sclock_);

  const auto it = functions_.find(hostFunction);
  if (it == functions_.end()) {
    return hipErrorInvalidSymbol;
  }

  // Lazy load
  FatBinaryInfo** module = it->second->moduleInfo();
  if (*(module) == nullptr) {
    hipError_t err = digestFatBinary(module_to_hostModule_[module], *module);
    assert(err == hipSuccess);
  }

  return it->second->getStatFuncAttr(func_attr, deviceId);
}

hipError_t StatCO::registerStatGlobalVar(const void* hostVar, Var* var) {
  amd::ScopedLock lock(sclock_);

  auto var_it = vars_.find(hostVar);
  if ((var_it != vars_.end()) && (var_it->second->getName() != var->getName())) {
    return hipErrorInvalidSymbol;
  }

  vars_.insert(std::make_pair(hostVar, var));
  module_to_hostVars_[var->moduleInfo()].push_back(hostVar);
  return hipSuccess;
}

hipError_t StatCO::getStatGlobalVar(const void* hostVar, int deviceId, hipDeviceptr_t* dev_ptr,
                                    size_t* size_ptr) {
  amd::ScopedLock lock(sclock_);

  const auto it = vars_.find(hostVar);
  if (it == vars_.end()) {
    return hipErrorInvalidSymbol;
  }

  // Lazy load
  FatBinaryInfo** module = it->second->moduleInfo();
  if (*(module) == nullptr) {
    hipError_t err = digestFatBinary(module_to_hostModule_[module], *module);
    assert(err == hipSuccess);
  }

  DeviceVar* dvar = nullptr;
  IHIP_RETURN_ONFAIL(it->second->getStatDeviceVar(&dvar, deviceId));

  *dev_ptr = dvar->device_ptr();
  *size_ptr = dvar->size();
  return hipSuccess;
}

hipError_t StatCO::registerStatManagedVar(Var* var) {
  managedVars_[var->moduleInfo()].push_back(var);
  return hipSuccess;
}

hipError_t StatCO::initStatManagedVarDevicePtr(int deviceId) {
  amd::ScopedLock lock(sclock_);
  hipError_t err = hipSuccess;
  if (managedVarsDevicePtrInitalized_.find(deviceId) == managedVarsDevicePtrInitalized_.end() ||
      !managedVarsDevicePtrInitalized_[deviceId]) {
    for (auto& vecIter : managedVars_) {
      for (auto& var : vecIter.second) {
        // Lazy load
        FatBinaryInfo** module = var->moduleInfo();
        if (*(module) == nullptr) {
          err = digestFatBinary(module_to_hostModule_[module], *module);
          assert(err == hipSuccess);
        }
        hip::Stream* stream = g_devices.at(deviceId)->NullStream();
        if (stream == nullptr) {
          ClPrint(amd::LOG_ERROR, amd::LOG_API, "Host Queue is NULL");
          return hipErrorInvalidResourceHandle;
        }
        // Allocate managed var for deferred loading
        IHIP_RETURN_ONFAIL(var->allocateManagedVarPtr());
        // Copy from managed var host to device ptr
        DeviceVar* dvar = nullptr;
        IHIP_RETURN_ONFAIL(var->getStatDeviceVar(&dvar, deviceId));
        err = ihipMemcpy(reinterpret_cast<address>(dvar->device_ptr()), var->getManagedVarPtr(),
                         dvar->size(), hipMemcpyHostToDevice, *stream);
      }
    }
    managedVarsDevicePtrInitalized_[deviceId] = true;
  }
  return err;
}
}  // namespace hip