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46 lines
1.6 KiB
C++
46 lines
1.6 KiB
C++
//===- ReduceSpecialGlobals.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 special globals, like @llvm.used, in the provided Module.
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//
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// For more details about special globals, see
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// https://llvm.org/docs/LangRef.html#intrinsic-global-variables
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//
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//===----------------------------------------------------------------------===//
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#include "ReduceSpecialGlobals.h"
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#include "Delta.h"
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#include "Utils.h"
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#include "llvm/ADT/StringRef.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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static StringRef SpecialGlobalNames[] = {"llvm.used", "llvm.compiler.used"};
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/// Removes all special globals aren't inside any of the
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/// desired Chunks.
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static void extractSpecialGlobalsFromModule(Oracle &O,
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ReducerWorkItem &WorkItem) {
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Module &Program = WorkItem.getModule();
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for (StringRef Name : SpecialGlobalNames) {
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if (auto *Used = Program.getNamedGlobal(Name)) {
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Used->replaceAllUsesWith(getDefaultValue(Used->getType()));
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Used->eraseFromParent();
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}
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}
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}
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void llvm::reduceSpecialGlobalsDeltaPass(TestRunner &Test) {
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runDeltaPass(Test, extractSpecialGlobalsFromModule,
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"Reducing Special Globals");
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}
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