1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
| //===- BasicAliasAnalysisTest.cpp - Unit tests for BasicAA ----------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Targeted tests that are hard/convoluted to make happen with just `opt`.
//
#include "llvm/Analysis/BasicAliasAnalysis.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"
using namespace llvm;
// FIXME: This is duplicated between this file and MemorySSATest. Refactor.
const static char DLString[] = "e-i64:64-f80:128-n8:16:32:64-S128";
/// There's a lot of common setup between these tests. This fixture helps reduce
/// that. Tests should mock up a function, store it in F, and then call
/// setupAnalyses().
class BasicAATest : public testing::Test {
protected:
// N.B. Many of these members depend on each other (e.g. the Module depends on
// the Context, etc.). So, order matters here (and in TestAnalyses).
LLVMContext C;
Module M;
IRBuilder<> B;
DataLayout DL;
TargetLibraryInfoImpl TLII;
TargetLibraryInfo TLI;
Function *F;
// Things that we need to build after the function is created.
struct TestAnalyses {
DominatorTree DT;
AssumptionCache AC;
BasicAAResult BAA;
AAQueryInfo AAQI;
TestAnalyses(BasicAATest &Test)
: DT(*Test.F), AC(*Test.F), BAA(Test.DL, *Test.F, Test.TLI, AC, &DT),
AAQI() {}
};
llvm::Optional<TestAnalyses> Analyses;
TestAnalyses &setupAnalyses() {
assert(F);
Analyses.emplace(*this);
return Analyses.getValue();
}
public:
BasicAATest()
: M("BasicAATest", C), B(C), DL(DLString), TLI(TLII), F(nullptr) {}
};
// Check that a function arg can't trivially alias a global when we're accessing
// >sizeof(global) bytes through that arg, unless the access size is just an
// upper-bound.
TEST_F(BasicAATest, AliasInstWithObjectOfImpreciseSize) {
F = Function::Create(
FunctionType::get(B.getVoidTy(), {B.getInt32Ty()->getPointerTo()}, false),
GlobalValue::ExternalLinkage, "F", &M);
BasicBlock *Entry(BasicBlock::Create(C, "", F));
B.SetInsertPoint(Entry);
Value *IncomingI32Ptr = F->arg_begin();
auto *GlobalPtr =
cast<GlobalVariable>(M.getOrInsertGlobal("some_global", B.getInt8Ty()));
// Without sufficiently restricted linkage/an init, some of the object size
// checking bits get more conservative.
GlobalPtr->setLinkage(GlobalValue::LinkageTypes::InternalLinkage);
GlobalPtr->setInitializer(B.getInt8(0));
auto &AllAnalyses = setupAnalyses();
BasicAAResult &BasicAA = AllAnalyses.BAA;
AAQueryInfo &AAQI = AllAnalyses.AAQI;
ASSERT_EQ(
BasicAA.alias(MemoryLocation(IncomingI32Ptr, LocationSize::precise(4)),
MemoryLocation(GlobalPtr, LocationSize::precise(1)), AAQI),
AliasResult::NoAlias);
ASSERT_EQ(
BasicAA.alias(MemoryLocation(IncomingI32Ptr, LocationSize::upperBound(4)),
MemoryLocation(GlobalPtr, LocationSize::precise(1)), AAQI),
AliasResult::MayAlias);
}
// Check that we fall back to MayAlias if we see an access of an entire object
// that's just an upper-bound.
TEST_F(BasicAATest, AliasInstWithFullObjectOfImpreciseSize) {
F = Function::Create(
FunctionType::get(B.getVoidTy(), {B.getInt64Ty()}, false),
GlobalValue::ExternalLinkage, "F", &M);
BasicBlock *Entry(BasicBlock::Create(C, "", F));
B.SetInsertPoint(Entry);
Value *ArbitraryI32 = F->arg_begin();
AllocaInst *I8 = B.CreateAlloca(B.getInt8Ty(), B.getInt32(2));
auto *I8AtUncertainOffset =
cast<GetElementPtrInst>(B.CreateGEP(B.getInt8Ty(), I8, ArbitraryI32));
auto &AllAnalyses = setupAnalyses();
BasicAAResult &BasicAA = AllAnalyses.BAA;
AAQueryInfo &AAQI = AllAnalyses.AAQI;
ASSERT_EQ(BasicAA.alias(
MemoryLocation(I8, LocationSize::precise(2)),
MemoryLocation(I8AtUncertainOffset, LocationSize::precise(1)),
AAQI),
AliasResult::PartialAlias);
ASSERT_EQ(BasicAA.alias(
MemoryLocation(I8, LocationSize::upperBound(2)),
MemoryLocation(I8AtUncertainOffset, LocationSize::precise(1)),
AAQI),
AliasResult::MayAlias);
}
|