6f288bd772
Having a separate counting method runs the risk of a mismatch between the actual reduction method and the counting method. Instead, create an Oracle that always returns true for shouldKeep(), run the reduction, and count how many times shouldKeep() was called. The module should not be modified if shouldKeep() always returns true. Reviewed By: Meinersbur Differential Revision: https://reviews.llvm.org/D113537
35 lines
1.3 KiB
C++
35 lines
1.3 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(Oracle &O, Module &Program) {
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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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void llvm::reduceGlobalsInitializersDeltaPass(TestRunner &Test) {
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outs() << "*** Reducing GVs initializers...\n";
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runDeltaPass(Test, extractGVsFromModule);
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}
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