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1 //===- MemoryBuiltinsTest.cpp - Tests for utilities in MemoryBuiltins.h ---===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "llvm/Analysis/MemoryBuiltins.h"
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10 #include "llvm/IR/Attributes.h"
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11 #include "llvm/IR/Constants.h"
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12 #include "llvm/IR/Function.h"
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13 #include "llvm/IR/LLVMContext.h"
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14 #include "llvm/IR/Module.h"
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15 #include "gtest/gtest.h"
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16
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17 using namespace llvm;
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18
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19 namespace {
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20 // allocsize should not imply that a function is a traditional allocation
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21 // function (e.g. that can be optimized out/...); it just tells us how many
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22 // bytes exist at the pointer handed back by the function.
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23 TEST(AllocSize, AllocationBuiltinsTest) {
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24 LLVMContext Context;
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25 Module M("", Context);
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26 IntegerType *ArgTy = Type::getInt32Ty(Context);
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27
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28 Function *AllocSizeFn = Function::Create(
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29 FunctionType::get(Type::getInt8PtrTy(Context), {ArgTy}, false),
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30 GlobalValue::ExternalLinkage, "F", &M);
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31
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32 AllocSizeFn->addFnAttr(Attribute::getWithAllocSizeArgs(Context, 1, None));
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33
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34 // 100 is arbitrary.
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35 std::unique_ptr<CallInst> Caller(
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36 CallInst::Create(AllocSizeFn, {ConstantInt::get(ArgTy, 100)}));
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37
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38 const TargetLibraryInfo *TLI = nullptr;
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39 EXPECT_FALSE(isNoAliasFn(Caller.get(), TLI));
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40 EXPECT_FALSE(isMallocLikeFn(Caller.get(), TLI));
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41 EXPECT_FALSE(isCallocLikeFn(Caller.get(), TLI));
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42 EXPECT_FALSE(isAllocLikeFn(Caller.get(), TLI));
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43
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44 // FIXME: We might be able to treat allocsize functions as general allocation
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45 // functions. For the moment, being conservative seems better (and we'd have
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46 // to plumb stuff around `isNoAliasFn`).
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47 EXPECT_FALSE(isAllocationFn(Caller.get(), TLI));
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48 }
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49 }
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