llvm/llvm/tools/bugpoint/ExtractFunction.cpp

//===- ExtractFunction.cpp - Extract a function from Program --------------===//
//
// 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 file implements several methods that are used to extract functions,
// loops, or portions of a module from the rest of the module.
//
//===----------------------------------------------------------------------===//

#include "BugDriver.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/Cloning.h"
#include "llvm/Transforms/Utils/CodeExtractor.h"
#include <set>
usingnamespacellvm;

#define DEBUG_TYPE …

namespace llvm {
bool DisableSimplifyCFG = …;
extern cl::opt<std::string> OutputPrefix;
} // End llvm namespace

namespace {
cl::opt<bool> NoDCE("disable-dce",
                    cl::desc("Do not use the -dce pass to reduce testcases"));
cl::opt<bool, true>
    NoSCFG("disable-simplifycfg", cl::location(DisableSimplifyCFG),
           cl::desc("Do not use the -simplifycfg pass to reduce testcases"));

Function *globalInitUsesExternalBA(GlobalVariable *GV) { … }
} // end anonymous namespace

std::unique_ptr<Module>
BugDriver::deleteInstructionFromProgram(const Instruction *I,
                                        unsigned Simplification) { … }

std::unique_ptr<Module>
BugDriver::performFinalCleanups(std::unique_ptr<Module> M,
                                bool MayModifySemantics) { … }

std::unique_ptr<Module> BugDriver::extractLoop(Module *M) { … }

static void eliminateAliases(GlobalValue *GV) { … }

//
// DeleteGlobalInitializer - "Remove" the global variable by deleting its
// initializer,
// making it external.
//
void llvm::DeleteGlobalInitializer(GlobalVariable *GV) { … }

// DeleteFunctionBody - "Remove" the function by deleting all of its basic
// blocks, making it external.
//
void llvm::DeleteFunctionBody(Function *F) { … }

/// GetTorInit - Given a list of entries for static ctors/dtors, return them
/// as a constant array.
static Constant *GetTorInit(std::vector<std::pair<Function *, int>> &TorList) { … }

/// SplitStaticCtorDtor - A module was recently split into two parts, M1/M2, and
/// M1 has all of the global variables.  If M2 contains any functions that are
/// static ctors/dtors, we need to add an llvm.global_[cd]tors global to M2, and
/// prune appropriate entries out of M1s list.
static void SplitStaticCtorDtor(const char *GlobalName, Module *M1, Module *M2,
                                ValueToValueMapTy &VMap) { … }

std::unique_ptr<Module>
llvm::SplitFunctionsOutOfModule(Module *M, const std::vector<Function *> &F,
                                ValueToValueMapTy &VMap) { … }

//===----------------------------------------------------------------------===//
// Basic Block Extraction Code
//===----------------------------------------------------------------------===//

std::unique_ptr<Module>
BugDriver::extractMappedBlocksFromModule(const std::vector<BasicBlock *> &BBs,
                                         Module *M) { … }