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/*========================== begin_copyright_notice ============================
Copyright (C) 2025 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "Compiler/Optimizer/OpenCLPasses/DropTargetFunctions/DropTargetFunctions.h"
#include "Probe/Assertion.h"
#include "common/LLVMWarningsPush.hpp"
#include <llvm/ADT/STLExtras.h>
#include <llvm/ADT/SmallSet.h>
#include <llvm/ADT/SmallVector.h>
#include <llvm/IR/Attributes.h>
#include <llvm/IR/BasicBlock.h>
#include <llvm/IR/Function.h>
#include <llvm/IR/IRBuilder.h>
#include "common/LLVMWarningsPop.hpp"
#include "CISACodeGen/helper.h"
#include "Compiler/IGCPassSupport.h"
#include "common/igc_regkeys.hpp"
#include <fstream>
#include <llvm/IR/Module.h>
#include <string>
#include <filesystem>
using namespace llvm;
using namespace IGC;
#define PASS_FLAG "igc-drop-target-fns"
#define PASS_DESCRIPTION "Drop target functions."
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(DropTargetFunctions, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_DEPENDENCY(CodeGenContextWrapper)
IGC_INITIALIZE_PASS_DEPENDENCY(MetaDataUtilsWrapper)
IGC_INITIALIZE_PASS_END(DropTargetFunctions, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
#define DROP_FN_DEBUG(msg) \
do { \
if (VerboseLog) { \
llvm::errs() << msg << "\n"; \
} \
} while (0)
char DropTargetFunctions::ID = 0;
DropTargetFunctions::DropTargetFunctions()
: ModulePass(ID), VerboseLog(IGC_GET_FLAG_VALUE(VerboseDropTargetFunctions)) {
initializeDropTargetFunctionsPass(*PassRegistry::getPassRegistry());
}
static llvm::Function *getPlaceholderFn(llvm::Function *F) {
llvm::Function *NewF =
llvm::Function::Create(F->getFunctionType(), F->getLinkage(), "tmp_dropped_fn", F->getParent());
NewF->takeName(F);
NewF->copyAttributesFrom(F);
NewF->setCallingConv(F->getCallingConv());
LLVMContext &Ctx = NewF->getContext();
BasicBlock *BB = BasicBlock::Create(Ctx, "drop_entry", NewF);
IRBuilder<> builder(BB);
if (IGC_GET_FLAG_VALUE(CrashOnDroppedFnAccess)) {
PointerType *PtrAsTy = PointerType::get(Type::getInt32Ty(Ctx), ::IGC::ADDRESS_SPACE_GLOBAL);
Value *NullPtr = Constant::getNullValue(PtrAsTy);
builder.CreateStore(ConstantInt::get(Type::getInt32Ty(Ctx), 42), NullPtr, true);
builder.CreateUnreachable();
if (NewF->hasFnAttribute(llvm::Attribute::AlwaysInline)) {
NewF->removeFnAttr(llvm::Attribute::AlwaysInline);
}
NewF->addFnAttr(llvm::Attribute::NoInline);
NewF->addFnAttr(llvm::Attribute::OptimizeNone);
} else {
builder.CreateUnreachable();
}
return NewF;
}
bool DropTargetFunctions::runOnModule(llvm::Module &M) {
IGCMD::MetaDataUtils *MdUtils = getAnalysis<MetaDataUtilsWrapper>().getMetaDataUtils();
DROP_FN_DEBUG("DropTargetFunctions: Starting ...");
// Find kernel function
Function *Kernel = nullptr;
for (auto i = MdUtils->begin_FunctionsInfo(), e = MdUtils->end_FunctionsInfo(); i != e; ++i) {
auto *KernelFunc = i->first;
if (isEntryFunc(MdUtils, KernelFunc)) {
if (Kernel != nullptr) {
DROP_FN_DEBUG("DropTargetFunctions: File with multiple kernels... SKIPPING ...");
return false;
}
Kernel = KernelFunc;
}
}
IGC_ASSERT(Kernel != nullptr);
const char *DropFnListBasePath = IGC_GET_REGKEYSTRING(DropTargetFnListPath);
SmallVector<std::string, 4> FnNamesToDrop;
std::filesystem::path DropFnListPath = std::filesystem::path(DropFnListBasePath) / (Kernel->getName().str() + ".txt");
{
std::ifstream DropFnFile(DropFnListPath);
if (!DropFnFile.is_open()) {
DROP_FN_DEBUG("DropTargetFunctions: Could not open DropTargetFnListPath file: " << DropFnListPath.string());
return false;
}
std::string line;
while (std::getline(DropFnFile, line)) {
if (!line.empty() && line.back() == '\r') {
line.pop_back();
}
FnNamesToDrop.push_back(line);
}
DropFnFile.close();
}
DROP_FN_DEBUG("DropTargetFunctions: Start FN Checks ...");
SmallPtrSet<Function *, 8> FnsToDrop;
SmallPtrSet<Function *, 8> Processed;
for (auto &F : M.functions()) {
if (F.isDeclaration()) {
continue;
}
if (!Processed.contains(&F) && llvm::any_of(FnNamesToDrop, [&F](std::string& Name) { return Name == F.getName(); })) {
auto *EmptyFn = getPlaceholderFn(&F);
Processed.insert(EmptyFn);
DROP_FN_DEBUG("Dropping function: " << EmptyFn->getName());
F.replaceAllUsesWith(EmptyFn);
FnsToDrop.insert(&F);
}
}
for (auto *F : FnsToDrop) {
F->eraseFromParent();
}
DROP_FN_DEBUG("DropTargetFunctions: Exiting ...");
return FnsToDrop.size() > 0;
}
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