1 //===- MemoryBuiltinsTest.cpp - Tests for utilities in MemoryBuiltins.h ---===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "llvm/Analysis/MemoryBuiltins.h" 11 #include "llvm/IR/Attributes.h" 12 #include "llvm/IR/Constants.h" 13 #include "llvm/IR/Function.h" 14 #include "llvm/IR/LLVMContext.h" 15 #include "llvm/IR/Module.h" 16 #include "gtest/gtest.h" 17 18 using namespace llvm; 19 20 namespace { 21 // allocsize should not imply that a function is a traditional allocation 22 // function (e.g. that can be optimized out/...); it just tells us how many 23 // bytes exist at the pointer handed back by the function. 24 TEST(AllocSize, AllocationBuiltinsTest) { 25 LLVMContext Context; 26 Module M("", Context); 27 IntegerType *ArgTy = Type::getInt32Ty(Context); 28 29 Function *AllocSizeFn = Function::Create( 30 FunctionType::get(Type::getInt8PtrTy(Context), {ArgTy}, false), 31 GlobalValue::ExternalLinkage, "F", &M); 32 33 AllocSizeFn->addFnAttr(Attribute::getWithAllocSizeArgs(Context, 1, None)); 34 35 // 100 is arbitrary. 36 std::unique_ptr<CallInst> Caller( 37 CallInst::Create(AllocSizeFn, {ConstantInt::get(ArgTy, 100)})); 38 39 const TargetLibraryInfo *TLI = nullptr; 40 EXPECT_FALSE(isNoAliasFn(Caller.get(), TLI)); 41 EXPECT_FALSE(isMallocLikeFn(Caller.get(), TLI)); 42 EXPECT_FALSE(isCallocLikeFn(Caller.get(), TLI)); 43 EXPECT_FALSE(isAllocLikeFn(Caller.get(), TLI)); 44 45 // FIXME: We might be able to treat allocsize functions as general allocation 46 // functions. For the moment, being conservative seems better (and we'd have 47 // to plumb stuff around `isNoAliasFn`). 48 EXPECT_FALSE(isAllocationFn(Caller.get(), TLI)); 49 } 50 } 51