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//===- 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";
}
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