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
175
176
177
178
179
180
181
182
183
|
/*
* Copyright (C) 2018 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.
*/
#include "src/profiling/memory/unwinding.h"
#include <cxxabi.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unwindstack/RegsGetLocal.h>
#include "perfetto/ext/base/scoped_file.h"
#include "src/profiling/memory/client.h"
#include "src/profiling/memory/wire_protocol.h"
#include "test/gtest_and_gmock.h"
namespace perfetto {
namespace profiling {
namespace {
TEST(UnwindingTest, StackOverlayMemoryOverlay) {
base::ScopedFile proc_mem(base::OpenFile("/proc/self/mem", O_RDONLY));
ASSERT_TRUE(proc_mem);
uint8_t fake_stack[1] = {120};
std::shared_ptr<FDMemory> mem(
std::make_shared<FDMemory>(std::move(proc_mem)));
StackOverlayMemory memory(mem, 0u, fake_stack, 1);
uint8_t buf[1] = {};
ASSERT_EQ(memory.Read(0u, buf, 1), 1u);
ASSERT_EQ(buf[0], 120);
}
TEST(UnwindingTest, StackOverlayMemoryNonOverlay) {
uint8_t value = 52;
base::ScopedFile proc_mem(base::OpenFile("/proc/self/mem", O_RDONLY));
ASSERT_TRUE(proc_mem);
uint8_t fake_stack[1] = {120};
std::shared_ptr<FDMemory> mem(
std::make_shared<FDMemory>(std::move(proc_mem)));
StackOverlayMemory memory(mem, 0u, fake_stack, 1);
uint8_t buf[1] = {1};
ASSERT_EQ(memory.Read(reinterpret_cast<uint64_t>(&value), buf, 1), 1u);
ASSERT_EQ(buf[0], value);
}
TEST(UnwindingTest, FileDescriptorMapsParse) {
base::ScopedFile proc_maps(base::OpenFile("/proc/self/maps", O_RDONLY));
ASSERT_TRUE(proc_maps);
FileDescriptorMaps maps(std::move(proc_maps));
ASSERT_TRUE(maps.Parse());
unwindstack::MapInfo* map_info =
maps.Find(reinterpret_cast<uint64_t>(&proc_maps));
ASSERT_NE(map_info, nullptr);
ASSERT_EQ(map_info->name, "[stack]");
}
void __attribute__((noinline)) AssertFunctionOffset() {
constexpr auto kMaxFunctionSize = 1000u;
// Need to zero-initialize to make MSAN happy. MSAN does not see the writes
// from AsmGetRegs (as it is in assembly) and complains otherwise.
char reg_data[kMaxRegisterDataSize] = {};
unwindstack::AsmGetRegs(reg_data);
auto regs = CreateRegsFromRawData(unwindstack::Regs::CurrentArch(), reg_data);
ASSERT_GT(regs->pc(), reinterpret_cast<uint64_t>(&AssertFunctionOffset));
ASSERT_LT(regs->pc() - reinterpret_cast<uint64_t>(&AssertFunctionOffset),
kMaxFunctionSize);
}
TEST(UnwindingTest, TestFunctionOffset) {
AssertFunctionOffset();
}
// This is needed because ASAN thinks copying the whole stack is a buffer
// underrun.
void __attribute__((noinline))
UnsafeMemcpy(void* dst, const void* src, size_t n)
__attribute__((no_sanitize("address", "hwaddress", "memory"))) {
const uint8_t* from = reinterpret_cast<const uint8_t*>(src);
uint8_t* to = reinterpret_cast<uint8_t*>(dst);
for (size_t i = 0; i < n; ++i)
to[i] = from[i];
}
struct RecordMemory {
std::unique_ptr<uint8_t[]> payload;
std::unique_ptr<AllocMetadata> metadata;
};
RecordMemory __attribute__((noinline)) GetRecord(WireMessage* msg) {
std::unique_ptr<AllocMetadata> metadata(new AllocMetadata);
*metadata = {};
const char* stackbase = GetThreadStackBase();
const char* stacktop = reinterpret_cast<char*>(__builtin_frame_address(0));
// Need to zero-initialize to make MSAN happy. MSAN does not see the writes
// from AsmGetRegs (as it is in assembly) and complains otherwise.
memset(metadata->register_data, 0, sizeof(metadata->register_data));
unwindstack::AsmGetRegs(metadata->register_data);
if (stackbase < stacktop) {
PERFETTO_FATAL("Stacktop >= stackbase.");
return {nullptr, nullptr};
}
size_t stack_size = static_cast<size_t>(stackbase - stacktop);
metadata->alloc_size = 10;
metadata->alloc_address = 0x10;
metadata->stack_pointer = reinterpret_cast<uint64_t>(stacktop);
metadata->stack_pointer_offset = sizeof(AllocMetadata);
metadata->arch = unwindstack::Regs::CurrentArch();
metadata->sequence_number = 1;
std::unique_ptr<uint8_t[]> payload(new uint8_t[stack_size]);
UnsafeMemcpy(&payload[0], stacktop, stack_size);
*msg = {};
msg->alloc_header = metadata.get();
msg->payload = reinterpret_cast<char*>(payload.get());
msg->payload_size = static_cast<size_t>(stack_size);
return {std::move(payload), std::move(metadata)};
}
TEST(UnwindingTest, DoUnwind) {
base::ScopedFile proc_maps(base::OpenFile("/proc/self/maps", O_RDONLY));
base::ScopedFile proc_mem(base::OpenFile("/proc/self/mem", O_RDONLY));
GlobalCallstackTrie callsites;
UnwindingMetadata metadata(getpid(), std::move(proc_maps),
std::move(proc_mem));
WireMessage msg;
auto record = GetRecord(&msg);
AllocRecord out;
ASSERT_TRUE(DoUnwind(&msg, &metadata, &out));
ASSERT_GT(out.frames.size(), 0u);
int st;
std::unique_ptr<char, base::FreeDeleter> demangled(abi::__cxa_demangle(
out.frames[0].frame.function_name.c_str(), nullptr, nullptr, &st));
ASSERT_EQ(st, 0) << "mangled: " << demangled.get()
<< ", frames: " << out.frames.size();
ASSERT_STREQ(demangled.get(),
"perfetto::profiling::(anonymous "
"namespace)::GetRecord(perfetto::profiling::WireMessage*)");
}
TEST(UnwindingTest, DoUnwindReparse) {
base::ScopedFile proc_maps(base::OpenFile("/proc/self/maps", O_RDONLY));
base::ScopedFile proc_mem(base::OpenFile("/proc/self/mem", O_RDONLY));
GlobalCallstackTrie callsites;
UnwindingMetadata metadata(getpid(), std::move(proc_maps),
std::move(proc_mem));
// Force reparse in DoUnwind.
metadata.maps.Reset();
WireMessage msg;
auto record = GetRecord(&msg);
AllocRecord out;
ASSERT_TRUE(DoUnwind(&msg, &metadata, &out));
ASSERT_GT(out.frames.size(), 0u);
int st;
std::unique_ptr<char, base::FreeDeleter> demangled(abi::__cxa_demangle(
out.frames[0].frame.function_name.c_str(), nullptr, nullptr, &st));
ASSERT_EQ(st, 0) << "mangled: " << demangled.get()
<< ", frames: " << out.frames.size();
ASSERT_STREQ(demangled.get(),
"perfetto::profiling::(anonymous "
"namespace)::GetRecord(perfetto::profiling::WireMessage*)");
}
} // namespace
} // namespace profiling
} // namespace perfetto
|
