| //===- ReduceAliases.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 aliases in the provided Module. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "ReduceAliases.h" |
| #include "Delta.h" |
| #include "llvm/IR/Constants.h" |
| #include "llvm/IR/GlobalValue.h" |
| |
| using namespace llvm; |
| |
| /// Removes all aliases aren't inside any of the |
| /// desired Chunks. |
| static void extractAliasesFromModule(const std::vector<Chunk> &ChunksToKeep, |
| Module *Program) { |
| Oracle O(ChunksToKeep); |
| |
| for (auto &GA : make_early_inc_range(Program->aliases())) { |
| if (!O.shouldKeep()) { |
| GA.replaceAllUsesWith(GA.getAliasee()); |
| GA.eraseFromParent(); |
| } |
| } |
| } |
| |
| /// Counts the amount of aliases and prints their respective name & index. |
| static int countAliases(Module *Program) { |
| // TODO: Silence index with --quiet flag |
| errs() << "----------------------------\n"; |
| errs() << "Aliases Index Reference:\n"; |
| int Count = 0; |
| for (auto &GA : Program->aliases()) |
| errs() << "\t" << ++Count << ": " << GA.getName() << "\n"; |
| |
| errs() << "----------------------------\n"; |
| return Count; |
| } |
| |
| void llvm::reduceAliasesDeltaPass(TestRunner &Test) { |
| errs() << "*** Reducing Aliases ...\n"; |
| int Functions = countAliases(Test.getProgram()); |
| runDeltaPass(Test, Functions, extractAliasesFromModule); |
| errs() << "----------------------------\n"; |
| } |