llvm/tools/llvm-reduce/deltas/ReduceGlobalVarInitializers.cpp

   1 //===- ReduceGlobalVars.cpp - Specialized Delta Pass ----------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements a function which calls the Generic Delta pass in order
  10 // to reduce initializers of Global Variables in the provided Module.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "ReduceGlobalVarInitializers.h"
  15 #include "llvm/IR/Constants.h"
  16 #include "llvm/IR/GlobalValue.h"
  17
  18 using namespace llvm;
  19
  20 /// Removes all the Initialized GVs that aren't inside the desired Chunks.
  21 static void extractGVsFromModule(Oracle &O, ReducerWorkItem &WorkItem) {
  22   // Drop initializers of out-of-chunk GVs
  23   for (auto &GV : WorkItem.getModule().globals())
  24     if (GV.hasInitializer() && !O.shouldKeep()) {
  25       GV.setInitializer(nullptr);
  26       GV.setLinkage(GlobalValue::LinkageTypes::ExternalLinkage);
  27       GV.setComdat(nullptr);
  28     }
  29 }
  30
  31 void llvm::reduceGlobalsInitializersDeltaPass(TestRunner &Test) {
  32   runDeltaPass(Test, extractGVsFromModule, "Reducing GV Initializers");
  33 }