1 //===- ReduceGlobalVars.cpp - Specialized Delta Pass ----------------------===// 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 // This file implements a function which calls the Generic Delta pass in order 10 // to reduce initializers of Global Variables in the provided Module. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "ReduceGlobalVarInitializers.h" 15 #include "llvm/IR/Constants.h" 16 #include "llvm/IR/GlobalValue.h" 17 18 using namespace llvm; 19 20 /// Removes all the Initialized GVs that aren't inside the desired Chunks. extractGVsFromModule(Oracle & O,ReducerWorkItem & WorkItem)21static void extractGVsFromModule(Oracle &O, ReducerWorkItem &WorkItem) { 22 // Drop initializers of out-of-chunk GVs 23 for (auto &GV : WorkItem.getModule().globals()) 24 if (GV.hasInitializer() && !O.shouldKeep()) { 25 GV.setInitializer(nullptr); 26 GV.setLinkage(GlobalValue::LinkageTypes::ExternalLinkage); 27 GV.setComdat(nullptr); 28 } 29 } 30 reduceGlobalsInitializersDeltaPass(TestRunner & Test)31void llvm::reduceGlobalsInitializersDeltaPass(TestRunner &Test) { 32 runDeltaPass(Test, extractGVsFromModule, "Reducing GV Initializers"); 33 } 34