1 //===- DXILFinalizeLinkage.cpp - Finalize linkage of functions ------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "DXILFinalizeLinkage.h" 10 #include "DirectX.h" 11 #include "llvm/IR/Function.h" 12 #include "llvm/IR/GlobalValue.h" 13 #include "llvm/IR/Metadata.h" 14 #include "llvm/IR/Module.h" 15 16 #define DEBUG_TYPE "dxil-finalize-linkage" 17 18 using namespace llvm; 19 20 static bool finalizeLinkage(Module &M) { 21 SmallPtrSet<Function *, 8> Funcs; 22 23 // Collect non-entry and non-exported functions to set to internal linkage. 24 for (Function &EF : M.functions()) { 25 if (EF.isIntrinsic()) 26 continue; 27 if (EF.hasFnAttribute("hlsl.shader") || EF.hasFnAttribute("hlsl.export")) 28 continue; 29 Funcs.insert(&EF); 30 } 31 32 for (Function *F : Funcs) { 33 if (F->getLinkage() == GlobalValue::ExternalLinkage) 34 F->setLinkage(GlobalValue::InternalLinkage); 35 if (F->isDefTriviallyDead()) 36 M.getFunctionList().erase(F); 37 } 38 39 return false; 40 } 41 42 PreservedAnalyses DXILFinalizeLinkage::run(Module &M, 43 ModuleAnalysisManager &AM) { 44 if (finalizeLinkage(M)) 45 return PreservedAnalyses::none(); 46 return PreservedAnalyses::all(); 47 } 48 49 bool DXILFinalizeLinkageLegacy::runOnModule(Module &M) { 50 return finalizeLinkage(M); 51 } 52 53 char DXILFinalizeLinkageLegacy::ID = 0; 54 55 INITIALIZE_PASS_BEGIN(DXILFinalizeLinkageLegacy, DEBUG_TYPE, 56 "DXIL Finalize Linkage", false, false) 57 INITIALIZE_PASS_END(DXILFinalizeLinkageLegacy, DEBUG_TYPE, 58 "DXIL Finalize Linkage", false, false) 59 60 ModulePass *llvm::createDXILFinalizeLinkageLegacyPass() { 61 return new DXILFinalizeLinkageLegacy(); 62 } 63