unittests/Analysis/MemoryBuiltinsTest.cpp

   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 }