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/*========================== begin_copyright_notice ============================
Copyright (C) 2018-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "llvm/Config/llvm-config.h"
#include "FunctionUpgrader.h"
#include "IGCIRBuilder.h"
#include "Probe/Assertion.h"
#include "llvmWrapper/IR/Function.h"
using namespace llvm;
void FunctionUpgrader::SetFunctionToUpgrade(llvm::Function *pFunction) { m_pFunction = pFunction; }
void FunctionUpgrader::Clean() {
m_pFunction = nullptr;
m_pNewArguments.clear();
m_placeHolders.clear();
}
llvm::Value *FunctionUpgrader::AddArgument(llvm::StringRef argName, llvm::Type *argType) {
IGC_ASSERT(nullptr != m_pFunction);
llvm::IGCIRBuilder<> builder(m_pFunction->getContext());
if (m_pFunction->begin()->empty()) {
builder.SetInsertPoint(&*m_pFunction->begin());
} else {
builder.SetInsertPoint(&*m_pFunction->begin()->begin());
}
llvm::AllocaInst *pPlaceHolderArgAlloc = builder.CreateAlloca(argType, 0, "");
// Create place holder load, which will simulate the argument for now
llvm::LoadInst *PlaceHolderArg =
builder.CreateLoad(pPlaceHolderArgAlloc->getAllocatedType(), pPlaceHolderArgAlloc, argName);
m_pNewArguments[PlaceHolderArg] = nullptr;
m_placeHolders.push_back(PlaceHolderArg);
return PlaceHolderArg;
}
bool FunctionUpgrader::IsUsedPlacedHolder(llvm::Value *PlaceHolderToCheck) {
return m_pNewArguments.find((LoadInst *)PlaceHolderToCheck) != m_pNewArguments.end();
}
Argument *FunctionUpgrader::GetArgumentFromRebuild(llvm::Value *pPlaceHolderArg) {
return GetArgumentFromRebuild((LoadInst *)pPlaceHolderArg);
}
Argument *FunctionUpgrader::GetArgumentFromRebuild(llvm::LoadInst *pPlaceHolderArg) {
if (IsUsedPlacedHolder(pPlaceHolderArg)) {
if (m_pNewArguments[pPlaceHolderArg] != nullptr) {
return m_pNewArguments[pPlaceHolderArg];
} else {
IGC_ASSERT_MESSAGE(0, "There is no created new argument, did you call RebuildFunction?");
return nullptr;
}
} else {
IGC_ASSERT_MESSAGE(0, "Didn't found new argument!");
return nullptr;
}
}
std::vector<LoadInst *> FunctionUpgrader::GetPlaceholderVec() { return m_placeHolders; }
uint32_t FunctionUpgrader::GetArgumentsSize() {
IGC_ASSERT(nullptr != m_pFunction);
return m_placeHolders.size() + m_pFunction->arg_size();
}
Function *FunctionUpgrader::RebuildFunction() {
Function *pFunctionRebuild = UpgradeFunctionWithNewArgs();
IGC_ASSERT(nullptr != m_pFunction);
IGC_ASSERT(nullptr != pFunctionRebuild);
auto i_arg_old = m_pFunction->arg_begin();
auto i_arg_new = pFunctionRebuild->arg_begin();
// Replace all usage in new method from old arguments to new arguments
while (i_arg_old != m_pFunction->arg_end()) {
i_arg_old->replaceAllUsesWith(i_arg_new);
++i_arg_old;
++i_arg_new;
}
// Replace all usage in new method from place holder to real argument
for (auto it = m_pNewArguments.begin(); it != m_pNewArguments.end(); ++it) {
it->first->replaceAllUsesWith(it->second);
}
CleanPlaceHoldersArgs();
pFunctionRebuild->copyAttributesFrom(m_pFunction);
pFunctionRebuild->setSubprogram(m_pFunction->getSubprogram());
m_pFunction->setSubprogram(nullptr);
pFunctionRebuild->takeName(m_pFunction);
return pFunctionRebuild;
}
FunctionType *FunctionUpgrader::UpgradeFunctionTypeWithNewArgs() {
std::vector<Type *> args;
// Get from old function all arguments type
for (auto i = m_pFunction->arg_begin(); i != m_pFunction->arg_end(); ++i) {
args.push_back(i->getType());
}
// Append new list arguments for new function
for (auto it = m_pNewArguments.begin(); it != m_pNewArguments.end(); ++it) {
args.push_back(it->first->getType());
}
return FunctionType::get(m_pFunction->getReturnType(), args, m_pFunction->isVarArg());
}
Function *FunctionUpgrader::UpgradeFunctionWithNewArgs() {
IGC_ASSERT(nullptr != m_pFunction);
auto fType = UpgradeFunctionTypeWithNewArgs();
auto fModule = m_pFunction->getParent();
auto fName = m_pFunction->getName();
auto fLinkage = m_pFunction->getLinkage();
// Create a new function
Function *pNewFunc = Function::Create(fType, fLinkage, fName);
IGC_ASSERT(nullptr != fModule);
fModule->getFunctionList().insert(m_pFunction->getIterator(), pNewFunc);
// rename all args
auto i_arg_old = m_pFunction->arg_begin();
auto i_arg_new = pNewFunc->arg_begin();
// Map old -> new args
// and setname for new func args from old func args
for (; i_arg_old != m_pFunction->arg_end(); ++i_arg_old, ++i_arg_new) {
auto arg_it = i_arg_old;
i_arg_new->takeName(arg_it);
}
// setname for new func args which was added as new one
for (auto it = m_pNewArguments.begin(); it != m_pNewArguments.end(); ++it) {
auto arg_it = i_arg_new;
// add to map pointer of the new argument
m_pNewArguments[it->first] = arg_it;
m_pNewArguments[it->first]->takeName(it->first);
++i_arg_new;
}
IGCLLVM::splice(pNewFunc, pNewFunc->begin(), m_pFunction);
return pNewFunc;
}
void FunctionUpgrader::CleanPlaceHoldersArgs() {
for (auto it = m_pNewArguments.begin(); it != m_pNewArguments.end(); ++it) {
// Remove all place holder stuff from new func
LoadInst *pPlaceHolderArg = it->first;
AllocaInst *pPlaceHolderArgAlloc = cast<AllocaInst>(pPlaceHolderArg->getPointerOperand());
pPlaceHolderArg->eraseFromParent();
pPlaceHolderArgAlloc->eraseFromParent();
}
}
int FunctionUpgrader::SizeArgFromRebuild() { return m_pNewArguments.size(); }
bool FunctionUpgrader::NeedToRebuild() { return m_pNewArguments.size() > 0; }
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