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//===- 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);
}
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