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
|
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_COMPILER_CFI_TEST_H_
#define ART_COMPILER_CFI_TEST_H_
#include <vector>
#include <memory>
#include <sstream>
#include "arch/instruction_set.h"
#include "dwarf/dwarf_constants.h"
#include "dwarf/dwarf_test.h"
#include "dwarf/headers.h"
#include "disassembler/disassembler.h"
#include "gtest/gtest.h"
namespace art {
constexpr dwarf::CFIFormat kCFIFormat = dwarf::DW_DEBUG_FRAME_FORMAT;
class CFITest : public dwarf::DwarfTest {
public:
void GenerateExpected(FILE* f, InstructionSet isa, const char* isa_str,
const std::vector<uint8_t>& actual_asm,
const std::vector<uint8_t>& actual_cfi) {
std::vector<std::string> lines;
// Print the raw bytes.
fprintf(f, "static constexpr uint8_t expected_asm_%s[] = {", isa_str);
HexDump(f, actual_asm);
fprintf(f, "\n};\n");
fprintf(f, "static constexpr uint8_t expected_cfi_%s[] = {", isa_str);
HexDump(f, actual_cfi);
fprintf(f, "\n};\n");
// Pretty-print CFI opcodes.
constexpr bool is64bit = false;
dwarf::DebugFrameOpCodeWriter<> initial_opcodes;
dwarf::WriteDebugFrameCIE(is64bit, dwarf::DW_EH_PE_absptr, dwarf::Reg(8),
initial_opcodes, kCFIFormat, &debug_frame_data_);
std::vector<uintptr_t> debug_frame_patches;
dwarf::WriteDebugFrameFDE(is64bit, 0, 0, actual_asm.size(), &actual_cfi,
kCFIFormat, &debug_frame_data_, &debug_frame_patches);
ReformatCfi(Objdump(false, "-W"), &lines);
// Pretty-print assembly.
auto* opts = new DisassemblerOptions(false, actual_asm.data(), true);
std::unique_ptr<Disassembler> disasm(Disassembler::Create(isa, opts));
std::stringstream stream;
const uint8_t* base = actual_asm.data() + (isa == kThumb2 ? 1 : 0);
disasm->Dump(stream, base, base + actual_asm.size());
ReformatAsm(&stream, &lines);
// Print CFI and assembly interleaved.
std::stable_sort(lines.begin(), lines.end(), CompareByAddress);
for (const std::string& line : lines) {
fprintf(f, "// %s\n", line.c_str());
}
fprintf(f, "\n");
}
private:
// Helper - get offset just past the end of given string.
static size_t FindEndOf(const std::string& str, const char* substr) {
size_t pos = str.find(substr);
CHECK_NE(std::string::npos, pos);
return pos + strlen(substr);
}
// Spit to lines and remove raw instruction bytes.
static void ReformatAsm(std::stringstream* stream,
std::vector<std::string>* output) {
std::string line;
while (std::getline(*stream, line)) {
line = line.substr(0, FindEndOf(line, ": ")) +
line.substr(FindEndOf(line, "\t"));
size_t pos;
while ((pos = line.find(" ")) != std::string::npos) {
line = line.replace(pos, 2, " ");
}
while (!line.empty() && line.back() == ' ') {
line.pop_back();
}
output->push_back(line);
}
}
// Find interesting parts of objdump output and prefix the lines with address.
static void ReformatCfi(const std::vector<std::string>& lines,
std::vector<std::string>* output) {
std::string address;
for (const std::string& line : lines) {
if (line.find("DW_CFA_nop") != std::string::npos) {
// Ignore.
} else if (line.find("DW_CFA_advance_loc") != std::string::npos) {
// The last 8 characters are the address.
address = "0x" + line.substr(line.size() - 8);
} else if (line.find("DW_CFA_") != std::string::npos) {
std::string new_line(line);
// "bad register" warning is caused by always using host (x86) objdump.
const char* bad_reg = "bad register: ";
size_t pos;
if ((pos = new_line.find(bad_reg)) != std::string::npos) {
new_line = new_line.replace(pos, strlen(bad_reg), "");
}
// Remove register names in parentheses since they have x86 names.
if ((pos = new_line.find(" (")) != std::string::npos) {
new_line = new_line.replace(pos, FindEndOf(new_line, ")") - pos, "");
}
// Use the .cfi_ prefix.
new_line = ".cfi_" + new_line.substr(FindEndOf(new_line, "DW_CFA_"));
output->push_back(address + ": " + new_line);
}
}
}
// Compare strings by the address prefix.
static bool CompareByAddress(const std::string& lhs, const std::string& rhs) {
EXPECT_EQ(lhs[10], ':');
EXPECT_EQ(rhs[10], ':');
return strncmp(lhs.c_str(), rhs.c_str(), 10) < 0;
}
// Pretty-print byte array. 12 bytes per line.
static void HexDump(FILE* f, const std::vector<uint8_t>& data) {
for (size_t i = 0; i < data.size(); i++) {
fprintf(f, i % 12 == 0 ? "\n " : " "); // Whitespace.
fprintf(f, "0x%02X,", data[i]);
}
}
};
} // namespace art
#endif // ART_COMPILER_CFI_TEST_H_
|
