unittests/Analysis/GlobalsModRefTest.cpp

   1 //===--- GlobalsModRefTest.cpp - Mixed TBAA unit tests --------------------===//
   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/GlobalsModRef.h"
  10 #include "llvm/AsmParser/Parser.h"
  11 #include "llvm/Support/SourceMgr.h"
  12 #include "gtest/gtest.h"
  13
  14 using namespace llvm;
  15
  16 TEST(GlobalsModRef, OptNone) {
  17   StringRef Assembly = R"(
  18     define void @f1() optnone {
  19       ret void
  20     }
  21     define void @f2() optnone readnone {
  22       ret void
  23     }
  24     define void @f3() optnone readonly {
  25       ret void
  26     }
  27   )";
  28
  29   LLVMContext Context;
  30   SMDiagnostic Error;
  31   auto M = parseAssemblyString(Assembly, Error, Context);
  32   ASSERT_TRUE(M) << "Bad assembly?";
  33
  34   const auto &funcs = M->functions();
  35   auto I = funcs.begin();
  36   ASSERT_NE(I, funcs.end());
  37   const Function &F1 = *I;
  38   ASSERT_NE(++I, funcs.end());
  39   const Function &F2 = *I;
  40   ASSERT_NE(++I, funcs.end());
  41   const Function &F3 = *I;
  42   EXPECT_EQ(++I, funcs.end());
  43
  44   Triple Trip(M->getTargetTriple());
  45   TargetLibraryInfoImpl TLII(Trip);
  46   TargetLibraryInfo TLI(TLII);
  47   auto GetTLI = [&TLI](Function &F) -> TargetLibraryInfo & { return TLI; };
  48   llvm::CallGraph CG(*M);
  49
  50   auto AAR = GlobalsAAResult::analyzeModule(*M, GetTLI, CG);
  51
  52   EXPECT_EQ(FMRB_UnknownModRefBehavior, AAR.getModRefBehavior(&F1));
  53   EXPECT_EQ(FMRB_DoesNotAccessMemory, AAR.getModRefBehavior(&F2));
  54   EXPECT_EQ(FMRB_OnlyReadsMemory, AAR.getModRefBehavior(&F3));
  55 }