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
18using namespace llvm;
19
20/// Removes all the Initialized GVs that aren't inside the desired Chunks.
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
31void llvm::reduceGlobalsInitializersDeltaPass(TestRunner &Test) {
32 runDeltaPass(Test, ExtractChunksFromModule: extractGVsFromModule, Message: "Reducing GV Initializers");
33}
34