1 //===- MemoryBuiltinsTest.cpp - Tests for utilities in MemoryBuiltins.h ---===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/Analysis/MemoryBuiltins.h" 10 #include "llvm/IR/Attributes.h" 11 #include "llvm/IR/Constants.h" 12 #include "llvm/IR/Function.h" 13 #include "llvm/IR/LLVMContext.h" 14 #include "llvm/IR/Module.h" 15 #include "gtest/gtest.h" 16 17 using namespace llvm; 18 19 namespace { 20 // allocsize should not imply that a function is a traditional allocation 21 // function (e.g. that can be optimized out/...); it just tells us how many 22 // bytes exist at the pointer handed back by the function. 23 TEST(AllocSize, AllocationBuiltinsTest) { 24 LLVMContext Context; 25 Module M("", Context); 26 IntegerType *ArgTy = Type::getInt32Ty(Context); 27 28 Function *AllocSizeFn = Function::Create( 29 FunctionType::get(Type::getInt8PtrTy(Context), {ArgTy}, false), 30 GlobalValue::ExternalLinkage, "F", &M); 31 32 AllocSizeFn->addFnAttr(Attribute::getWithAllocSizeArgs(Context, 1, None)); 33 34 // 100 is arbitrary. 35 std::unique_ptr<CallInst> Caller( 36 CallInst::Create(AllocSizeFn, {ConstantInt::get(ArgTy, 100)})); 37 38 const TargetLibraryInfo *TLI = nullptr; 39 EXPECT_FALSE(isNoAliasFn(Caller.get(), TLI)); 40 EXPECT_FALSE(isMallocLikeFn(Caller.get(), TLI)); 41 EXPECT_FALSE(isCallocLikeFn(Caller.get(), TLI)); 42 EXPECT_FALSE(isAllocLikeFn(Caller.get(), TLI)); 43 44 // FIXME: We might be able to treat allocsize functions as general allocation 45 // functions. For the moment, being conservative seems better (and we'd have 46 // to plumb stuff around `isNoAliasFn`). 47 EXPECT_FALSE(isAllocationFn(Caller.get(), TLI)); 48 } 49 } 50