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/*========================== begin_copyright_notice ============================
Copyright (C) 2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "common/LLVMWarningsPush.hpp"
#include <llvm/ADT/SetVector.h>
#include <llvm/IR/InstIterator.h>
#include <llvm/Transforms/Utils/Cloning.h>
#include <llvm/Transforms/IPO.h>
#include "llvmWrapper/Transforms/IPO/GlobalDCE.h"
#include "llvmWrapper/Transforms/IPO/StripSymbols.h"
#include "llvmWrapper/Transforms/IPO/StripDeadPrototypes.h"
#include "common/LLVMWarningsPop.hpp"
#include <common/LLVMUtils.h>
#include <common/ModuleSplitter.h>
#include <Compiler/CodeGenPublic.h>
#include "Compiler/CISACodeGen/OpenCLKernelCodeGen.hpp"
namespace IGC {
KernelModuleSplitter::KernelModuleSplitter(IGC::OpenCLProgramContext &oclContext, llvm::Module &module)
: _oclContext(oclContext), _originalModule(module), _splittedModule(nullptr) {}
KernelModuleSplitter::~KernelModuleSplitter() { restoreOclContextModule(); }
void KernelModuleSplitter::splitModuleForKernel(const llvm::Function *kernelF) {
using namespace llvm;
IGC_ASSERT_EXIT_MESSAGE(kernelF != nullptr, "Cannot split for null function!");
std::vector<const Function *> workqueue;
SetVector<const GlobalValue *> GVs;
// add all functions called by the kernel, recursively
// start with the kernel...
GVs.insert(kernelF);
workqueue.push_back(kernelF);
// and for all called functions...
while (!workqueue.empty()) {
const Function *F = workqueue.back();
workqueue.pop_back();
for (const auto &I : instructions(F)) {
if (const CallBase *CB = dyn_cast<CallBase>(&I)) {
if (const Function *CF = CB->getCalledFunction()) {
if (CF->isDeclaration() || GVs.count(CF))
continue;
// add only defined ones and rerun for their's calls ...
GVs.insert(CF);
workqueue.push_back(CF);
}
}
}
}
// add all globals - it's easier to let them be removed later than search for them here
for (auto &GV : _originalModule.globals()) {
GVs.insert(&GV);
}
// create new module with selected globals and functions
ValueToValueMapTy VMap;
std::unique_ptr<Module> kernelM =
CloneModule(_originalModule, VMap, [&](const GlobalValue *GV) { return GVs.count(GV); });
IGC_ASSERT_EXIT_MESSAGE(kernelM, "Cloning module failed!");
// Do cleanup.
IGC::IGCPassManager mpm(&_oclContext, "CleanupAfterModuleSplitting");
mpm.add(IGCLLVM::createLegacyWrappedGlobalDCEPass()); // Delete unreachable globals.
mpm.add(IGCLLVM::createLegacyWrappedStripDeadDebugInfoPass()); // Remove dead debug info.
mpm.add(IGCLLVM::createLegacyWrappedStripDeadPrototypesPass()); // Remove dead func decls.
mpm.run(*kernelM.get());
_splittedModule = std::move(kernelM);
}
void KernelModuleSplitter::retry() {
if (_splittedModule) {
restoreOclContextModule();
delete _splittedModule.release();
}
}
void KernelModuleSplitter::restoreOclContextModule() {
if (_splittedModule) {
_oclContext.clearMD();
_oclContext.setModule(&_originalModule);
}
}
void KernelModuleSplitter::setSplittedModuleInOCLContext() {
if (_splittedModule) {
_oclContext.clearMD();
_oclContext.setModule(_splittedModule.get());
}
}
} // namespace IGC
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