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📄 AlwaysInliner.cpp(6.51 KB)
📄 ArgumentPromotion.cpp(44.76 KB)
📄 Attributor.cpp(81.04 KB)
📄 AttributorAttributes.cpp(269.7 KB)
📄 BarrierNoopPass.cpp(1.67 KB)
📄 BlockExtractor.cpp(8.17 KB)
📄 CalledValuePropagation.cpp(17.71 KB)
📄 ConstantMerge.cpp(9.59 KB)
📄 CrossDSOCFI.cpp(5.98 KB)
📄 DeadArgumentElimination.cpp(42.84 KB)
📄 ElimAvailExtern.cpp(3.14 KB)
📄 ExtractGV.cpp(5.2 KB)
📄 ForceFunctionAttrs.cpp(4.79 KB)
📄 FunctionAttrs.cpp(55.56 KB)
📄 FunctionImport.cpp(55.28 KB)
📄 GlobalDCE.cpp(15.55 KB)
📄 GlobalOpt.cpp(119.78 KB)
📄 GlobalSplit.cpp(6.92 KB)
📄 HotColdSplitting.cpp(26.27 KB)
📄 IPConstantPropagation.cpp(10.68 KB)
📄 IPO.cpp(4.94 KB)
📄 InferFunctionAttrs.cpp(2.89 KB)
📄 InlineSimple.cpp(4.21 KB)
📄 Inliner.cpp(44.77 KB)
📄 Internalize.cpp(9.52 KB)
📄 LoopExtractor.cpp(7.14 KB)
📄 LowerTypeTests.cpp(83.98 KB)
📄 MergeFunctions.cpp(34.12 KB)
📄 OpenMPOpt.cpp(52.75 KB)
📄 PartialInlining.cpp(55.67 KB)
📄 PassManagerBuilder.cpp(49.21 KB)
📄 PruneEH.cpp(9.54 KB)
📄 SCCP.cpp(3.22 KB)
📄 SampleProfile.cpp(77.15 KB)
📄 StripDeadPrototypes.cpp(2.73 KB)
📄 StripSymbols.cpp(11.7 KB)
📄 SyntheticCountsPropagation.cpp(5.64 KB)
📄 ThinLTOBitcodeWriter.cpp(20.16 KB)
📄 WholeProgramDevirt.cpp(85.02 KB)

Editing: ElimAvailExtern.cpp

//===- ElimAvailExtern.cpp - DCE unreachable internal functions -----------===//
//
// 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 transform is designed to eliminate available external global
// definitions from the program, turning them into declarations.
//
//===----------------------------------------------------------------------===//

#include "llvm/Transforms/IPO/ElimAvailExtern.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Module.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/Utils/GlobalStatus.h"

using namespace llvm;

#define DEBUG_TYPE "elim-avail-extern"

STATISTIC(NumFunctions, "Number of functions removed");
STATISTIC(NumVariables, "Number of global variables removed");

static bool eliminateAvailableExternally(Module &M) {
  bool Changed = false;

// Drop initializers of available externally global variables.
  for (GlobalVariable &GV : M.globals()) {
    if (!GV.hasAvailableExternallyLinkage())
      continue;
    if (GV.hasInitializer()) {
      Constant *Init = GV.getInitializer();
      GV.setInitializer(nullptr);
      if (isSafeToDestroyConstant(Init))
        Init->destroyConstant();
    }
    GV.removeDeadConstantUsers();
    GV.setLinkage(GlobalValue::ExternalLinkage);
    NumVariables++;
    Changed = true;
  }

// Drop the bodies of available externally functions.
  for (Function &F : M) {
    if (!F.hasAvailableExternallyLinkage())
      continue;
    if (!F.isDeclaration())
      // This will set the linkage to external
      F.deleteBody();
    F.removeDeadConstantUsers();
    NumFunctions++;
    Changed = true;
  }

return Changed;
}

PreservedAnalyses
EliminateAvailableExternallyPass::run(Module &M, ModuleAnalysisManager &) {
  if (!eliminateAvailableExternally(M))
    return PreservedAnalyses::all();
  return PreservedAnalyses::none();
}

namespace {

struct EliminateAvailableExternallyLegacyPass : public ModulePass {
  static char ID; // Pass identification, replacement for typeid

EliminateAvailableExternallyLegacyPass() : ModulePass(ID) {
    initializeEliminateAvailableExternallyLegacyPassPass(
        *PassRegistry::getPassRegistry());
  }

// run - Do the EliminateAvailableExternally pass on the specified module,
  // optionally updating the specified callgraph to reflect the changes.
  bool runOnModule(Module &M) override {
    if (skipModule(M))
      return false;
    return eliminateAvailableExternally(M);
  }
};

} // end anonymous namespace

char EliminateAvailableExternallyLegacyPass::ID = 0;

INITIALIZE_PASS(EliminateAvailableExternallyLegacyPass, "elim-avail-extern",
                "Eliminate Available Externally Globals", false, false)

ModulePass *llvm::createEliminateAvailableExternallyPass() {
  return new EliminateAvailableExternallyLegacyPass();
}

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Editing: ElimAvailExtern.cpp

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