53 lines
1.9 KiB
C++
53 lines
1.9 KiB
C++
//===- ReduceGlobalVars.cpp - Specialized Delta Pass ----------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a function which calls the Generic Delta pass in order
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// to reduce initializers of Global Variables in the provided Module.
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//
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//===----------------------------------------------------------------------===//
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#include "ReduceGlobalVarInitializers.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/GlobalValue.h"
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using namespace llvm;
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/// Removes all the Initialized GVs that aren't inside the desired Chunks.
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static void extractGVsFromModule(std::vector<Chunk> ChunksToKeep,
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Module *Program) {
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Oracle O(ChunksToKeep);
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// Drop initializers of out-of-chunk GVs
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for (auto &GV : Program->globals())
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if (GV.hasInitializer() && !O.shouldKeep()) {
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GV.setInitializer(nullptr);
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GV.setLinkage(GlobalValue::LinkageTypes::ExternalLinkage);
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GV.setComdat(nullptr);
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}
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}
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/// Counts the amount of initialized GVs and displays their
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/// respective name & index
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static int countGVs(Module *Program) {
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// TODO: Silence index with --quiet flag
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outs() << "----------------------------\n";
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outs() << "GlobalVariable Index Reference:\n";
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int GVCount = 0;
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for (auto &GV : Program->globals())
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if (GV.hasInitializer())
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outs() << "\t" << ++GVCount << ": " << GV.getName() << "\n";
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outs() << "----------------------------\n";
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return GVCount;
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}
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void llvm::reduceGlobalsInitializersDeltaPass(TestRunner &Test) {
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outs() << "*** Reducing GVs initializers...\n";
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int GVCount = countGVs(Test.getProgram());
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runDeltaPass(Test, GVCount, extractGVsFromModule);
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}
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