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