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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "Compiler/MetaDataApi/PurgeMetaDataUtils.hpp"
#include "Compiler/IGCPassSupport.h"
#include "Compiler/CodeGenPublic.h"
#include "common/LLVMUtils.h"
using namespace llvm;
using namespace IGC;
// Register pass to igc-opt
#define PASS_FLAG "igc-purgeMetaDataUtils-import"
#define PASS_DESCRIPTION "PurgeMetaDataUtilsImport"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(PurgeMetaDataUtils, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_DEPENDENCY(MetaDataUtilsWrapper)
IGC_INITIALIZE_PASS_DEPENDENCY(CodeGenContextWrapper)
IGC_INITIALIZE_PASS_END(PurgeMetaDataUtils, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
char PurgeMetaDataUtils::ID = 0;
PurgeMetaDataUtils::PurgeMetaDataUtils() : ModulePass(ID)
{
initializePurgeMetaDataUtilsPass(*PassRegistry::getPassRegistry());
}
// Remove metadata entries in metadata utils for inlined or dead functions.
// TODO: get rid of this step if we do not keep any non-kernel function in the
// metadata util object.
bool PurgeMetaDataUtils::runOnModule(Module& M)
{
return purgeMetaDataUtils(M, &getAnalysis<MetaDataUtilsWrapper>());
}
bool IGC::purgeMetaDataUtils(Module& M, MetaDataUtilsWrapper* MDUW) {
IGCMD::MetaDataUtils* MDUtils = MDUW->getMetaDataUtils();
auto shouldRemoveFunction = [=](llvm::Module& M, void* ptr)
{
llvm::Function* F = nullptr;
// Function may have been removed already.
for (auto& G : M.getFunctionList())
{
if (&G == ptr)
{
F = &G;
break;
}
}
// Already deleted, or not used non-kernels.
if (F == nullptr)
{
return true;
}
if (F->use_empty() && !isEntryFunc(MDUtils, F))
{
if (F->hasFnAttribute("referenced-indirectly") &&
GlobalValue::isExternalLinkage(F->getLinkage()))
{
// Do not delete externally linked functions, even if there are no uses in the current module.
// However if it's only used internally, and we somehow resolve the indirect call, we can remove it.
return false;
}
if (isPixelShaderPhaseFunction(F)) {
// In some cases pixel shader codegen splits the compilation
// to phases, removing entry functions from metadata, but assumes they
// will be available in the next pass. Leave such functions in the module.
return false;
}
if (IGC_IS_FLAG_ENABLED(EnableUnmaskedFunctions) && F->hasFnAttribute("sycl-unmasked"))
return false;
F->eraseFromParent();
return true;
}
// Kernels or used non-kernels.
return false;
};
// Collect all functions for which metadata will be removed.
SmallSet<llvm::Function*, 8> ToBeDeleted;
auto checkFuncRange = [&](auto beginIt, auto endIt) {
for (auto it = beginIt, e = endIt; it != e; ++it)
{
if (shouldRemoveFunction(M, it->first))
{
ToBeDeleted.insert(it->first);
}
}
};
auto& FuncMD = MDUW->getModuleMetaData()->FuncMD;
checkFuncRange(MDUtils->begin_FunctionsInfo(), MDUtils->end_FunctionsInfo());
checkFuncRange(FuncMD.begin(), FuncMD.end());
// Remove them.
for (auto F : ToBeDeleted)
{
auto Iter = MDUtils->findFunctionsInfoItem(F);
if (Iter != MDUtils->end_FunctionsInfo())
{
MDUtils->eraseFunctionsInfoItem(Iter);
}
if (FuncMD.find(F) != FuncMD.end())
{
FuncMD.erase(F);
}
}
// Update when there is any change.
if (!ToBeDeleted.empty())
{
MDUtils->save(M.getContext());
}
return !ToBeDeleted.empty();
}
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