llvm/llvm/lib/Analysis/TypeMetadataUtils.cpp

//===- TypeMetadataUtils.cpp - Utilities related to type metadata ---------===//
//
// 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 contains functions that make it easier to manipulate type metadata
// for devirtualization.
//
//===----------------------------------------------------------------------===//

#include "llvm/Analysis/TypeMetadataUtils.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Module.h"

usingnamespacellvm;

// Search for virtual calls that call FPtr and add them to DevirtCalls.
static void
findCallsAtConstantOffset(SmallVectorImpl<DevirtCallSite> &DevirtCalls,
                          bool *HasNonCallUses, Value *FPtr, uint64_t Offset,
                          const CallInst *CI, DominatorTree &DT) { … }

// Search for virtual calls that load from VPtr and add them to DevirtCalls.
static void findLoadCallsAtConstantOffset(
    const Module *M, SmallVectorImpl<DevirtCallSite> &DevirtCalls, Value *VPtr,
    int64_t Offset, const CallInst *CI, DominatorTree &DT) { … }

void llvm::findDevirtualizableCallsForTypeTest(
    SmallVectorImpl<DevirtCallSite> &DevirtCalls,
    SmallVectorImpl<CallInst *> &Assumes, const CallInst *CI,
    DominatorTree &DT) { … }

void llvm::findDevirtualizableCallsForTypeCheckedLoad(
    SmallVectorImpl<DevirtCallSite> &DevirtCalls,
    SmallVectorImpl<Instruction *> &LoadedPtrs,
    SmallVectorImpl<Instruction *> &Preds, bool &HasNonCallUses,
    const CallInst *CI, DominatorTree &DT) { … }

Constant *llvm::getPointerAtOffset(Constant *I, uint64_t Offset, Module &M,
                                   Constant *TopLevelGlobal) { … }

std::pair<Function *, Constant *>
llvm::getFunctionAtVTableOffset(GlobalVariable *GV, uint64_t Offset,
                                Module &M) { … }

static void replaceRelativePointerUserWithZero(User *U) { … }

void llvm::replaceRelativePointerUsersWithZero(Constant *C) { … }