blob: 575b7f32047372e4af1e1aab05023ce197039242 [file] [log] [blame]
//===- MemoryBuiltinsTest.cpp - Tests for utilities in MemoryBuiltins.h ---===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "llvm/Analysis/MemoryBuiltins.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
// allocsize should not imply that a function is a traditional allocation
// function (e.g. that can be optimized out/...); it just tells us how many
// bytes exist at the pointer handed back by the function.
TEST(AllocSize, AllocationBuiltinsTest) {
LLVMContext Context;
Module M("", Context);
IntegerType *ArgTy = Type::getInt32Ty(Context);
Function *AllocSizeFn = Function::Create(
FunctionType::get(Type::getInt8PtrTy(Context), {ArgTy}, false),
GlobalValue::ExternalLinkage, "F", &M);
AllocSizeFn->addFnAttr(Attribute::getWithAllocSizeArgs(Context, 1, None));
// 100 is arbitrary.
std::unique_ptr<CallInst> Caller(
CallInst::Create(AllocSizeFn, {ConstantInt::get(ArgTy, 100)}));
const TargetLibraryInfo *TLI = nullptr;
EXPECT_FALSE(isNoAliasFn(Caller.get(), TLI));
EXPECT_FALSE(isMallocLikeFn(Caller.get(), TLI));
EXPECT_FALSE(isCallocLikeFn(Caller.get(), TLI));
EXPECT_FALSE(isAllocLikeFn(Caller.get(), TLI));
// FIXME: We might be able to treat allocsize functions as general allocation
// functions. For the moment, being conservative seems better (and we'd have
// to plumb stuff around `isNoAliasFn`).
EXPECT_FALSE(isAllocationFn(Caller.get(), TLI));