File: stacktrace_unittest.cc

package info (click to toggle)
autofdo 0.18-2
  • links: PTS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 92,568 kB
  • sloc: cpp: 26,830; sh: 12,538; makefile: 344; ansic: 134; python: 95
file content (208 lines) | stat: -rw-r--r-- 8,039 bytes parent folder | download | duplicates (8)
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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
// Copyright (c) 2004, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "utilities.h"

#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#include "base/commandlineflags.h"
#include "glog/logging.h"
#include "stacktrace.h"

#ifdef HAVE_EXECINFO_H
# include <execinfo.h>
#endif

using namespace GOOGLE_NAMESPACE;

#ifdef HAVE_STACKTRACE

// Obtain a backtrace, verify that the expected callers are present in the
// backtrace, and maybe print the backtrace to stdout.

// The sequence of functions whose return addresses we expect to see in the
// backtrace.
const int BACKTRACE_STEPS = 6;

struct AddressRange {
  const void *start, *end;
};

// Expected function [start,end] range.
AddressRange expected_range[BACKTRACE_STEPS];

#if __GNUC__
// Using GCC extension: address of a label can be taken with '&&label'.
// Start should be a label somewhere before recursive call, end somewhere
// after it.
#define INIT_ADDRESS_RANGE(fn, start_label, end_label, prange)           \
  do {                                                                   \
    (prange)->start = &&start_label;                                     \
    (prange)->end = &&end_label;                                         \
    CHECK_LT((prange)->start, (prange)->end);                            \
  } while (0)
// This macro expands into "unmovable" code (opaque to GCC), and that
// prevents GCC from moving a_label up or down in the code.
// Without it, there is no code following the 'end' label, and GCC
// (4.3.1, 4.4.0) thinks it safe to assign &&end an address that is before
// the recursive call.
#define DECLARE_ADDRESS_LABEL(a_label)                                   \
  a_label: do { __asm__ __volatile__(""); } while (0)
// Gcc 4.4.0 may split function into multiple chunks, and the chunk
// performing recursive call may end up later in the code then the return
// instruction (this actually happens with FDO).
// Adjust function range from __builtin_return_address.
#define ADJUST_ADDRESS_RANGE_FROM_RA(prange)                             \
  do {                                                                   \
    void *ra = __builtin_return_address(0);                              \
    CHECK_LT((prange)->start, ra);                                       \
    if (ra > (prange)->end) {                                            \
      printf("Adjusting range from %p..%p to %p..%p\n",                  \
             (prange)->start, (prange)->end,                             \
             (prange)->start, ra);                                       \
      (prange)->end = ra;                                                \
    }                                                                    \
  } while (0)
#else
// Assume the Check* functions below are not longer than 256 bytes.
#define INIT_ADDRESS_RANGE(fn, start_label, end_label, prange)           \
  do {                                                                   \
    (prange)->start = reinterpret_cast<const void *>(&fn);               \
    (prange)->end = reinterpret_cast<const char *>(&fn) + 256;           \
  } while (0)
#define DECLARE_ADDRESS_LABEL(a_label) do { } while (0)
#define ADJUST_ADDRESS_RANGE_FROM_RA(prange) do { } while (0)
#endif  // __GNUC__

//-----------------------------------------------------------------------//

void CheckRetAddrIsInFunction(void *ret_addr, const AddressRange &range)
{
  CHECK_GE(ret_addr, range.start);
  CHECK_LE(ret_addr, range.end);
}

//-----------------------------------------------------------------------//

void ATTRIBUTE_NOINLINE CheckStackTrace(int);
void ATTRIBUTE_NOINLINE CheckStackTraceLeaf(void) {
  const int STACK_LEN = 10;
  void *stack[STACK_LEN];
  int size;

  ADJUST_ADDRESS_RANGE_FROM_RA(&expected_range[1]);
  INIT_ADDRESS_RANGE(CheckStackTraceLeaf, start, end, &expected_range[0]);
  DECLARE_ADDRESS_LABEL(start);
  size = GetStackTrace(stack, STACK_LEN, 0);
  printf("Obtained %d stack frames.\n", size);
  CHECK_GE(size, 1);
  CHECK_LE(size, STACK_LEN);

  if (1) {
#ifdef HAVE_EXECINFO_H
    char **strings = backtrace_symbols(stack, size);
    printf("Obtained %d stack frames.\n", size);
    for (int i = 0; i < size; i++)
      printf("%s %p\n", strings[i], stack[i]);
    printf("CheckStackTrace() addr: %p\n", &CheckStackTrace);
    free(strings);
#endif
  }
  for (int i = 0; i < BACKTRACE_STEPS; i++) {
    printf("Backtrace %d: expected: %p..%p  actual: %p ... ",
           i, expected_range[i].start, expected_range[i].end, stack[i]);
    fflush(stdout);
    CheckRetAddrIsInFunction(stack[i], expected_range[i]);
    printf("OK\n");
  }
  DECLARE_ADDRESS_LABEL(end);
}

//-----------------------------------------------------------------------//

/* Dummy functions to make the backtrace more interesting. */
void ATTRIBUTE_NOINLINE CheckStackTrace4(int i) {
  ADJUST_ADDRESS_RANGE_FROM_RA(&expected_range[2]);
  INIT_ADDRESS_RANGE(CheckStackTrace4, start, end, &expected_range[1]);
  DECLARE_ADDRESS_LABEL(start);
  for (int j = i; j >= 0; j--)
    CheckStackTraceLeaf();
  DECLARE_ADDRESS_LABEL(end);
}
void ATTRIBUTE_NOINLINE CheckStackTrace3(int i) {
  ADJUST_ADDRESS_RANGE_FROM_RA(&expected_range[3]);
  INIT_ADDRESS_RANGE(CheckStackTrace3, start, end, &expected_range[2]);
  DECLARE_ADDRESS_LABEL(start);
  for (int j = i; j >= 0; j--)
    CheckStackTrace4(j);
  DECLARE_ADDRESS_LABEL(end);
}
void ATTRIBUTE_NOINLINE CheckStackTrace2(int i) {
  ADJUST_ADDRESS_RANGE_FROM_RA(&expected_range[4]);
  INIT_ADDRESS_RANGE(CheckStackTrace2, start, end, &expected_range[3]);
  DECLARE_ADDRESS_LABEL(start);
  for (int j = i; j >= 0; j--)
    CheckStackTrace3(j);
  DECLARE_ADDRESS_LABEL(end);
}
void ATTRIBUTE_NOINLINE CheckStackTrace1(int i) {
  ADJUST_ADDRESS_RANGE_FROM_RA(&expected_range[5]);
  INIT_ADDRESS_RANGE(CheckStackTrace1, start, end, &expected_range[4]);
  DECLARE_ADDRESS_LABEL(start);
  for (int j = i; j >= 0; j--)
    CheckStackTrace2(j);
  DECLARE_ADDRESS_LABEL(end);
}
void ATTRIBUTE_NOINLINE CheckStackTrace(int i) {
  INIT_ADDRESS_RANGE(CheckStackTrace, start, end, &expected_range[5]);
  DECLARE_ADDRESS_LABEL(start);
  for (int j = i; j >= 0; j--)
    CheckStackTrace1(j);
  DECLARE_ADDRESS_LABEL(end);
}

//-----------------------------------------------------------------------//

int main(int, char ** argv) {
  FLAGS_logtostderr = true;
  InitGoogleLogging(argv[0]);

  CheckStackTrace(0);

  printf("PASS\n");
  return 0;
}

#else
int main() {
  printf("PASS (no stacktrace support)\n");
  return 0;
}
#endif  // HAVE_STACKTRACE