Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/unittests/Analysis/GlobalsModRefTest.cpp

@@ -0,0 +1,55 @@
+//===--- GlobalsModRefTest.cpp - Mixed TBAA unit tests --------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/GlobalsModRef.h"
+#include "llvm/AsmParser/Parser.h"
+#include "llvm/Support/SourceMgr.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+TEST(GlobalsModRef, OptNone) {
+  StringRef Assembly = R"(
+    define void @f1() optnone {
+      ret void
+    }
+    define void @f2() optnone readnone {
+      ret void
+    }
+    define void @f3() optnone readonly {
+      ret void
+    }
+  )";
+
+  LLVMContext Context;
+  SMDiagnostic Error;
+  auto M = parseAssemblyString(Assembly, Error, Context);
+  ASSERT_TRUE(M) << "Bad assembly?";
+
+  const auto &funcs = M->functions();
+  auto I = funcs.begin();
+  ASSERT_NE(I, funcs.end());
+  const Function &F1 = *I;
+  ASSERT_NE(++I, funcs.end());
+  const Function &F2 = *I;
+  ASSERT_NE(++I, funcs.end());
+  const Function &F3 = *I;
+  EXPECT_EQ(++I, funcs.end());
+
+  Triple Trip(M->getTargetTriple());
+  TargetLibraryInfoImpl TLII(Trip);
+  TargetLibraryInfo TLI(TLII);
+  llvm::CallGraph CG(*M);
+
+  auto AAR = GlobalsAAResult::analyzeModule(*M, TLI, CG);
+
+  EXPECT_EQ(FMRB_UnknownModRefBehavior, AAR.getModRefBehavior(&F1));
+  EXPECT_EQ(FMRB_DoesNotAccessMemory, AAR.getModRefBehavior(&F2));
+  EXPECT_EQ(FMRB_OnlyReadsMemory, AAR.getModRefBehavior(&F3));
+}