LinkGraphTests.cpp
7.12 KB
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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
//===------ LinkGraphTests.cpp - Unit tests for core JITLink classes ------===//
//
// 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/ADT/STLExtras.h"
#include "llvm/ExecutionEngine/JITLink/JITLink.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Memory.h"
#include "gtest/gtest.h"
using namespace llvm;
using namespace llvm::jitlink;
static auto RWFlags =
sys::Memory::ProtectionFlags(sys::Memory::MF_READ | sys::Memory::MF_WRITE);
TEST(LinkGraphTest, Construction) {
// Check that LinkGraph construction works as expected.
LinkGraph G("foo", 8, support::little);
EXPECT_EQ(G.getName(), "foo");
EXPECT_EQ(G.getPointerSize(), 8U);
EXPECT_EQ(G.getEndianness(), support::little);
EXPECT_TRUE(llvm::empty(G.external_symbols()));
EXPECT_TRUE(llvm::empty(G.absolute_symbols()));
EXPECT_TRUE(llvm::empty(G.defined_symbols()));
EXPECT_TRUE(llvm::empty(G.blocks()));
}
TEST(LinkGraphTest, BlockAndSymbolIteration) {
// Check that we can iterate over blocks within Sections and across sections.
const char BlockContentBytes[] = {0x10, 0x11, 0x12, 0x13, 0x14, 0x15,
0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B,
0x1C, 0x1D, 0x1E, 0x1F, 0x00};
StringRef BlockContent(BlockContentBytes);
LinkGraph G("foo", 8, support::little);
auto &Sec1 = G.createSection("__data.1", RWFlags);
auto &B1 = G.createContentBlock(Sec1, BlockContent, 0x1000, 8, 0);
auto &B2 = G.createContentBlock(Sec1, BlockContent, 0x2000, 8, 0);
auto &S1 = G.addDefinedSymbol(B1, 0, "S1", 4, Linkage::Strong, Scope::Default,
false, false);
auto &S2 = G.addDefinedSymbol(B2, 4, "S2", 4, Linkage::Strong, Scope::Default,
false, false);
auto &Sec2 = G.createSection("__data.1", RWFlags);
auto &B3 = G.createContentBlock(Sec2, BlockContent, 0x3000, 8, 0);
auto &B4 = G.createContentBlock(Sec2, BlockContent, 0x4000, 8, 0);
auto &S3 = G.addDefinedSymbol(B3, 0, "S3", 4, Linkage::Strong, Scope::Default,
false, false);
auto &S4 = G.addDefinedSymbol(B4, 4, "S4", 4, Linkage::Strong, Scope::Default,
false, false);
// Check that iteration of blocks within a section behaves as expected.
EXPECT_EQ(std::distance(Sec1.blocks().begin(), Sec1.blocks().end()), 2);
EXPECT_TRUE(llvm::count(Sec1.blocks(), &B1));
EXPECT_TRUE(llvm::count(Sec1.blocks(), &B2));
// Check that iteration of symbols within a section behaves as expected.
EXPECT_EQ(std::distance(Sec1.symbols().begin(), Sec1.symbols().end()), 2);
EXPECT_TRUE(llvm::count(Sec1.symbols(), &S1));
EXPECT_TRUE(llvm::count(Sec1.symbols(), &S2));
// Check that iteration of blocks across sections behaves as expected.
EXPECT_EQ(std::distance(G.blocks().begin(), G.blocks().end()), 4);
EXPECT_TRUE(llvm::count(G.blocks(), &B1));
EXPECT_TRUE(llvm::count(G.blocks(), &B2));
EXPECT_TRUE(llvm::count(G.blocks(), &B3));
EXPECT_TRUE(llvm::count(G.blocks(), &B4));
// Check that iteration of defined symbols across sections behaves as
// expected.
EXPECT_EQ(
std::distance(G.defined_symbols().begin(), G.defined_symbols().end()), 4);
EXPECT_TRUE(llvm::count(G.defined_symbols(), &S1));
EXPECT_TRUE(llvm::count(G.defined_symbols(), &S2));
EXPECT_TRUE(llvm::count(G.defined_symbols(), &S3));
EXPECT_TRUE(llvm::count(G.defined_symbols(), &S4));
}
TEST(LinkGraphTest, SplitBlock) {
// Check that the LinkGraph::splitBlock test works as expected.
const char BlockContentBytes[] = {0x10, 0x11, 0x12, 0x13, 0x14, 0x15,
0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B,
0x1C, 0x1D, 0x1E, 0x1F, 0x00};
StringRef BlockContent(BlockContentBytes);
LinkGraph G("foo", 8, support::little);
auto &Sec = G.createSection("__data", RWFlags);
// Create the block to split.
auto &B1 = G.createContentBlock(Sec, BlockContent, 0x1000, 8, 0);
// Add some symbols to the block.
auto &S1 = G.addDefinedSymbol(B1, 0, "S1", 4, Linkage::Strong, Scope::Default,
false, false);
auto &S2 = G.addDefinedSymbol(B1, 4, "S2", 4, Linkage::Strong, Scope::Default,
false, false);
auto &S3 = G.addDefinedSymbol(B1, 8, "S3", 4, Linkage::Strong, Scope::Default,
false, false);
auto &S4 = G.addDefinedSymbol(B1, 12, "S4", 4, Linkage::Strong,
Scope::Default, false, false);
// Add an extra block, EB, and target symbols, and use these to add edges
// from B1 to EB.
auto &EB = G.createContentBlock(Sec, BlockContent, 0x2000, 8, 0);
auto &ES1 = G.addDefinedSymbol(EB, 0, "TS1", 4, Linkage::Strong,
Scope::Default, false, false);
auto &ES2 = G.addDefinedSymbol(EB, 4, "TS2", 4, Linkage::Strong,
Scope::Default, false, false);
auto &ES3 = G.addDefinedSymbol(EB, 8, "TS3", 4, Linkage::Strong,
Scope::Default, false, false);
auto &ES4 = G.addDefinedSymbol(EB, 12, "TS4", 4, Linkage::Strong,
Scope::Default, false, false);
// Add edges from B1 to EB.
B1.addEdge(Edge::FirstRelocation, 0, ES1, 0);
B1.addEdge(Edge::FirstRelocation, 4, ES2, 0);
B1.addEdge(Edge::FirstRelocation, 8, ES3, 0);
B1.addEdge(Edge::FirstRelocation, 12, ES4, 0);
// Split B1.
auto &B2 = G.splitBlock(B1, 8);
// Check that the block addresses and content matches what we would expect.
EXPECT_EQ(B1.getAddress(), 0x1008U);
EXPECT_EQ(B1.getContent(), BlockContent.substr(8));
EXPECT_EQ(B2.getAddress(), 0x1000U);
EXPECT_EQ(B2.getContent(), BlockContent.substr(0, 8));
// Check that symbols in B1 were transferred as expected:
// We expect S1 and S2 to have been transferred to B2, and S3 and S4 to have
// remained attached to B1. Symbols S3 and S4 should have had their offsets
// slid to account for the change in address of B2.
EXPECT_EQ(&S1.getBlock(), &B2);
EXPECT_EQ(S1.getOffset(), 0U);
EXPECT_EQ(&S2.getBlock(), &B2);
EXPECT_EQ(S2.getOffset(), 4U);
EXPECT_EQ(&S3.getBlock(), &B1);
EXPECT_EQ(S3.getOffset(), 0U);
EXPECT_EQ(&S4.getBlock(), &B1);
EXPECT_EQ(S4.getOffset(), 4U);
// Check that edges in B1 have been transferred as expected:
// Both blocks should now have two edges each at offsets 0 and 4.
EXPECT_EQ(llvm::size(B1.edges()), 2);
if (size(B1.edges()) == 2) {
auto *E1 = &*B1.edges().begin();
auto *E2 = &*(B1.edges().begin() + 1);
if (E2->getOffset() < E1->getOffset())
std::swap(E1, E2);
EXPECT_EQ(E1->getOffset(), 0U);
EXPECT_EQ(E2->getOffset(), 4U);
}
EXPECT_EQ(llvm::size(B2.edges()), 2);
if (size(B2.edges()) == 2) {
auto *E1 = &*B2.edges().begin();
auto *E2 = &*(B2.edges().begin() + 1);
if (E2->getOffset() < E1->getOffset())
std::swap(E1, E2);
EXPECT_EQ(E1->getOffset(), 0U);
EXPECT_EQ(E2->getOffset(), 4U);
}
}