1 //=======- AliasSetTrackerTest.cpp - Unit test for the Alias Set Tracker -===// 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/AliasAnalysis.h" 10 #include "llvm/Analysis/AliasSetTracker.h" 11 #include "llvm/Analysis/TypeBasedAliasAnalysis.h" 12 #include "llvm/AsmParser/Parser.h" 13 #include "llvm/IR/LLVMContext.h" 14 #include "llvm/IR/Module.h" 15 #include "llvm/Support/SourceMgr.h" 16 #include "gtest/gtest.h" 17 18 using namespace llvm; 19 20 TEST(AliasSetTracker, AliasUnknownInst) { 21 StringRef Assembly = R"( 22 @a = common global i32 0, align 4 23 @b = common global float 0.000000e+00, align 4 24 25 ; Function Attrs: nounwind ssp uwtable 26 define i32 @read_a() #0 { 27 %1 = load i32, i32* @a, align 4, !tbaa !3 28 ret i32 %1 29 } 30 31 ; Function Attrs: nounwind ssp uwtable 32 define void @write_b() #0 { 33 store float 1.000000e+01, float* @b, align 4, !tbaa !7 34 ret void 35 } 36 37 ; Function Attrs: nounwind ssp uwtable 38 define void @test() #0 { 39 %1 = call i32 @read_a(), !tbaa !3 40 call void @write_b(), !tbaa !7 41 ret void 42 } 43 44 !3 = !{!4, !4, i64 0} 45 !4 = !{!"int", !5, i64 0} 46 !5 = !{!"omnipotent char", !6, i64 0} 47 !6 = !{!"Simple C/C++ TBAA"} 48 !7 = !{!8, !8, i64 0} 49 !8 = !{!"float", !5, i64 0} 50 )"; 51 52 // Parse the IR. The two calls in @test can not access aliasing elements. 53 LLVMContext Context; 54 SMDiagnostic Error; 55 auto M = parseAssemblyString(Assembly, Error, Context); 56 ASSERT_TRUE(M) << "Bad assembly?"; 57 58 // Initialize the alias result. 59 Triple Trip(M->getTargetTriple()); 60 TargetLibraryInfoImpl TLII(Trip); 61 TargetLibraryInfo TLI(TLII); 62 AAResults AA(TLI); 63 TypeBasedAAResult TBAAR; 64 AA.addAAResult(TBAAR); 65 66 // Initialize the alias set tracker for the @test function. 67 Function *Test = M->getFunction("test"); 68 ASSERT_NE(Test, nullptr); 69 AliasSetTracker AST(AA); 70 for (auto &BB : *Test) 71 AST.add(BB); 72 // There should be 2 disjoint alias sets. 1 from each call. 73 ASSERT_EQ((int)AST.getAliasSets().size(), 2); 74 75 // Directly test aliasesUnknownInst. 76 // Now every call instruction should only alias one alias set. 77 for (auto &Inst : *Test->begin()) { 78 bool FoundAS = false; 79 for (AliasSet &AS : AST) { 80 if (!Inst.mayReadOrWriteMemory()) 81 continue; 82 if (!AS.aliasesUnknownInst(&Inst, AA)) 83 continue; 84 ASSERT_NE(FoundAS, true); 85 FoundAS = true; 86 } 87 } 88 } 89