Initial check in
Bug: 137197907
diff --git a/src/llvm-project/llvm/unittests/Analysis/MemoryBuiltinsTest.cpp b/src/llvm-project/llvm/unittests/Analysis/MemoryBuiltinsTest.cpp
new file mode 100644
index 0000000..898ebee
--- /dev/null
+++ b/src/llvm-project/llvm/unittests/Analysis/MemoryBuiltinsTest.cpp
@@ -0,0 +1,50 @@
+//===- MemoryBuiltinsTest.cpp - Tests for utilities in MemoryBuiltins.h ---===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/MemoryBuiltins.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+namespace {
+// allocsize should not imply that a function is a traditional allocation
+// function (e.g. that can be optimized out/...); it just tells us how many
+// bytes exist at the pointer handed back by the function.
+TEST(AllocSize, AllocationBuiltinsTest) {
+ LLVMContext Context;
+ Module M("", Context);
+ IntegerType *ArgTy = Type::getInt32Ty(Context);
+
+ Function *AllocSizeFn = Function::Create(
+ FunctionType::get(Type::getInt8PtrTy(Context), {ArgTy}, false),
+ GlobalValue::ExternalLinkage, "F", &M);
+
+ AllocSizeFn->addFnAttr(Attribute::getWithAllocSizeArgs(Context, 1, None));
+
+ // 100 is arbitrary.
+ std::unique_ptr<CallInst> Caller(
+ CallInst::Create(AllocSizeFn, {ConstantInt::get(ArgTy, 100)}));
+
+ const TargetLibraryInfo *TLI = nullptr;
+ EXPECT_FALSE(isNoAliasFn(Caller.get(), TLI));
+ EXPECT_FALSE(isMallocLikeFn(Caller.get(), TLI));
+ EXPECT_FALSE(isCallocLikeFn(Caller.get(), TLI));
+ EXPECT_FALSE(isAllocLikeFn(Caller.get(), TLI));
+
+ // FIXME: We might be able to treat allocsize functions as general allocation
+ // functions. For the moment, being conservative seems better (and we'd have
+ // to plumb stuff around `isNoAliasFn`).
+ EXPECT_FALSE(isAllocationFn(Caller.get(), TLI));
+}
+}
