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//===- DXILFinalizeLinkage.cpp - Finalize linkage of functions ------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "DXILFinalizeLinkage.h"
#include "DirectX.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#define DEBUG_TYPE "dxil-finalize-linkage"
using namespace llvm;
static bool finalizeLinkage(Module &M) {
bool MadeChange = false;
// Convert private globals and external globals with no usage to internal
// linkage.
for (GlobalVariable &GV : M.globals()) {
GV.removeDeadConstantUsers();
if (GV.hasPrivateLinkage() || (GV.hasExternalLinkage() && GV.use_empty())) {
GV.setLinkage(GlobalValue::InternalLinkage);
MadeChange = true;
}
}
SmallVector<Function *> Funcs;
// Collect non-entry and non-exported functions to set to internal linkage.
for (Function &EF : M.functions()) {
if (EF.isIntrinsic())
continue;
if (EF.hasExternalLinkage() && EF.hasDefaultVisibility())
continue;
if (EF.hasFnAttribute("hlsl.shader"))
continue;
Funcs.push_back(&EF);
}
for (Function *F : Funcs) {
if (F->getLinkage() == GlobalValue::ExternalLinkage) {
F->setLinkage(GlobalValue::InternalLinkage);
MadeChange = true;
}
if (F->isDefTriviallyDead()) {
M.getFunctionList().erase(F);
MadeChange = true;
}
}
return MadeChange;
}
PreservedAnalyses DXILFinalizeLinkage::run(Module &M,
ModuleAnalysisManager &AM) {
if (finalizeLinkage(M))
return PreservedAnalyses::none();
return PreservedAnalyses::all();
}
bool DXILFinalizeLinkageLegacy::runOnModule(Module &M) {
return finalizeLinkage(M);
}
char DXILFinalizeLinkageLegacy::ID = 0;
INITIALIZE_PASS_BEGIN(DXILFinalizeLinkageLegacy, DEBUG_TYPE,
"DXIL Finalize Linkage", false, false)
INITIALIZE_PASS_END(DXILFinalizeLinkageLegacy, DEBUG_TYPE,
"DXIL Finalize Linkage", false, false)
ModulePass *llvm::createDXILFinalizeLinkageLegacyPass() {
return new DXILFinalizeLinkageLegacy();
}
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