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//=======- AliasSetTrackerTest.cpp - Unit test for the Alias Set Tracker -===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/AliasSetTracker.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Analysis/TypeBasedAliasAnalysis.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"
using namespace llvm;
TEST(AliasSetTracker, AliasUnknownInst) {
StringRef Assembly = R"(
@a = common global i32 0, align 4
@b = common global float 0.000000e+00, align 4
; Function Attrs: nounwind ssp uwtable
define i32 @read_a() #0 {
%1 = load i32, i32* @a, align 4, !tbaa !3
ret i32 %1
}
; Function Attrs: nounwind ssp uwtable
define void @write_b() #0 {
store float 1.000000e+01, float* @b, align 4, !tbaa !7
ret void
}
; Function Attrs: nounwind ssp uwtable
define void @test() #0 {
%1 = call i32 @read_a(), !tbaa !3
call void @write_b(), !tbaa !7
ret void
}
!3 = !{!4, !4, i64 0}
!4 = !{!"int", !5, i64 0}
!5 = !{!"omnipotent char", !6, i64 0}
!6 = !{!"Simple C/C++ TBAA"}
!7 = !{!8, !8, i64 0}
!8 = !{!"float", !5, i64 0}
)";
// Parse the IR. The two calls in @test can not access aliasing elements.
LLVMContext Context;
SMDiagnostic Error;
auto M = parseAssemblyString(Assembly, Error, Context);
ASSERT_TRUE(M) << "Bad assembly?";
// Initialize the alias result.
Triple Trip(M->getTargetTriple());
TargetLibraryInfoImpl TLII(Trip);
TargetLibraryInfo TLI(TLII);
AAResults AA(TLI);
TypeBasedAAResult TBAAR;
AA.addAAResult(TBAAR);
// Initialize the alias set tracker for the @test function.
Function *Test = M->getFunction("test");
ASSERT_NE(Test, nullptr);
AliasSetTracker AST(AA);
for (auto &BB : *Test)
AST.add(BB);
// There should be 2 disjoint alias sets. 1 from each call.
ASSERT_EQ((int)AST.getAliasSets().size(), 2);
// Directly test aliasesUnknownInst.
// Now every call instruction should only alias one alias set.
for (auto &Inst : *Test->begin()) {
bool FoundAS = false;
for (AliasSet &AS : AST) {
if (!Inst.mayReadOrWriteMemory())
continue;
if (!AS.aliasesUnknownInst(&Inst, AA))
continue;
ASSERT_NE(FoundAS, true);
FoundAS = true;
}
}
}
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