1 //===- ASanStackFrameLayoutTest.cpp - Tests for ComputeASanStackFrameLayout===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 #include "llvm/Transforms/Utils/ASanStackFrameLayout.h"
10 #include "llvm/ADT/ArrayRef.h"
11 #include "gtest/gtest.h"
12 #include <sstream>
13 
14 using namespace llvm;
15 
16 static std::string
ShadowBytesToString(ArrayRef<uint8_t> ShadowBytes)17 ShadowBytesToString(ArrayRef<uint8_t> ShadowBytes) {
18   std::ostringstream os;
19   for (size_t i = 0, n = ShadowBytes.size(); i < n; i++) {
20     switch (ShadowBytes[i]) {
21       case kAsanStackLeftRedzoneMagic:    os << "L"; break;
22       case kAsanStackRightRedzoneMagic:   os << "R"; break;
23       case kAsanStackMidRedzoneMagic:     os << "M"; break;
24       default:                            os << (unsigned)ShadowBytes[i];
25     }
26   }
27   return os.str();
28 }
29 
TestLayout(SmallVector<ASanStackVariableDescription,10> Vars,size_t Granularity,size_t MinHeaderSize,const std::string & ExpectedDescr,const std::string & ExpectedShadow)30 static void TestLayout(SmallVector<ASanStackVariableDescription, 10> Vars,
31                        size_t Granularity, size_t MinHeaderSize,
32                        const std::string &ExpectedDescr,
33                        const std::string &ExpectedShadow) {
34   ASanStackFrameLayout L;
35   ComputeASanStackFrameLayout(Vars, Granularity, MinHeaderSize, &L);
36   EXPECT_EQ(ExpectedDescr, L.DescriptionString);
37   EXPECT_EQ(ExpectedShadow, ShadowBytesToString(L.ShadowBytes));
38 }
39 
TEST(ASanStackFrameLayout,Test)40 TEST(ASanStackFrameLayout, Test) {
41 #define VEC1(a) SmallVector<ASanStackVariableDescription, 10>(1, a)
42 #define VEC(a)                                                                 \
43   SmallVector<ASanStackVariableDescription, 10>(a, a + sizeof(a) / sizeof(a[0]))
44 
45 #define VAR(name, size, alignment)                                             \
46   ASanStackVariableDescription name##size##_##alignment = {                    \
47     #name #size "_" #alignment,                                                \
48     size,                                                                      \
49     alignment,                                                                 \
50     0,                                                                         \
51     0                                                                          \
52   }
53 
54   VAR(a, 1, 1);
55   VAR(p, 1, 32);
56   VAR(p, 1, 256);
57   VAR(a, 2, 1);
58   VAR(a, 3, 1);
59   VAR(a, 4, 1);
60   VAR(a, 7, 1);
61   VAR(a, 8, 1);
62   VAR(a, 9, 1);
63   VAR(a, 16, 1);
64   VAR(a, 41, 1);
65   VAR(a, 105, 1);
66 
67   TestLayout(VEC1(a1_1), 8, 16, "1 16 1 4 a1_1", "LL1R");
68   TestLayout(VEC1(a1_1), 64, 64, "1 64 1 4 a1_1", "L1");
69   TestLayout(VEC1(p1_32), 8, 32, "1 32 1 5 p1_32", "LLLL1RRR");
70   TestLayout(VEC1(p1_32), 8, 64, "1 64 1 5 p1_32", "LLLLLLLL1RRRRRRR");
71 
72   TestLayout(VEC1(a1_1), 8, 32, "1 32 1 4 a1_1", "LLLL1RRR");
73   TestLayout(VEC1(a2_1), 8, 32, "1 32 2 4 a2_1", "LLLL2RRR");
74   TestLayout(VEC1(a3_1), 8, 32, "1 32 3 4 a3_1", "LLLL3RRR");
75   TestLayout(VEC1(a4_1), 8, 32, "1 32 4 4 a4_1", "LLLL4RRR");
76   TestLayout(VEC1(a7_1), 8, 32, "1 32 7 4 a7_1", "LLLL7RRR");
77   TestLayout(VEC1(a8_1), 8, 32, "1 32 8 4 a8_1", "LLLL0RRR");
78   TestLayout(VEC1(a9_1), 8, 32, "1 32 9 4 a9_1", "LLLL01RR");
79   TestLayout(VEC1(a16_1), 8, 32, "1 32 16 5 a16_1", "LLLL00RR");
80   TestLayout(VEC1(p1_256), 8, 32, "1 256 1 6 p1_256",
81              "LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL1RRR");
82   TestLayout(VEC1(a41_1), 8, 32, "1 32 41 5 a41_1", "LLLL000001RRRRRR");
83   TestLayout(VEC1(a105_1), 8, 32, "1 32 105 6 a105_1",
84              "LLLL00000000000001RRRRRR");
85 
86   {
87     ASanStackVariableDescription t[] = {a1_1, p1_256};
88     TestLayout(VEC(t), 8, 32,
89                "2 256 1 6 p1_256 272 1 4 a1_1",
90                "LLLLLLLL" "LLLLLLLL" "LLLLLLLL" "LLLLLLLL" "1M1R");
91   }
92 
93   {
94     ASanStackVariableDescription t[] = {a1_1, a16_1, a41_1};
95     TestLayout(VEC(t), 8, 32,
96                "3 32 1 4 a1_1 48 16 5 a16_1 80 41 5 a41_1",
97                "LLLL" "1M00" "MM00" "0001" "RRRR");
98   }
99 #undef VEC1
100 #undef VEC
101 #undef VAR
102 }
103