| //===- ReduceGlobalVars.cpp - Specialized Delta Pass ----------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements a function which calls the Generic Delta pass in order |
| // to reduce initializers of Global Variables in the provided Module. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "ReduceGlobalVarInitializers.h" |
| #include "llvm/IR/Constants.h" |
| #include "llvm/IR/GlobalValue.h" |
| |
| using namespace llvm; |
| |
| /// Removes all the Initialized GVs that aren't inside the desired Chunks. |
| static void extractGVsFromModule(std::vector<Chunk> ChunksToKeep, |
| Module *Program) { |
| Oracle O(ChunksToKeep); |
| |
| // Drop initializers of out-of-chunk GVs |
| for (auto &GV : Program->globals()) |
| if (GV.hasInitializer() && !O.shouldKeep()) { |
| GV.setInitializer(nullptr); |
| GV.setLinkage(GlobalValue::LinkageTypes::ExternalLinkage); |
| GV.setComdat(nullptr); |
| } |
| } |
| |
| /// Counts the amount of initialized GVs and displays their |
| /// respective name & index |
| static int countGVs(Module *Program) { |
| // TODO: Silence index with --quiet flag |
| outs() << "----------------------------\n"; |
| outs() << "GlobalVariable Index Reference:\n"; |
| int GVCount = 0; |
| for (auto &GV : Program->globals()) |
| if (GV.hasInitializer()) |
| outs() << "\t" << ++GVCount << ": " << GV.getName() << "\n"; |
| outs() << "----------------------------\n"; |
| return GVCount; |
| } |
| |
| void llvm::reduceGlobalsInitializersDeltaPass(TestRunner &Test) { |
| outs() << "*** Reducing GVs initializers...\n"; |
| int GVCount = countGVs(Test.getProgram()); |
| runDeltaPass(Test, GVCount, extractGVsFromModule); |
| } |