base/debug/stack_trace_unittest.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <limits>
   6 #include <sstream>
   7 #include <string>
   8
   9 #include "base/debug/stack_trace.h"
  10 #include "base/logging.h"
  11 #include "base/process/kill.h"
  12 #include "base/process/process_handle.h"
  13 #include "base/test/test_timeouts.h"
  14 #include "testing/gtest/include/gtest/gtest.h"
  15 #include "testing/multiprocess_func_list.h"
  16
  17 #if defined(OS_POSIX) && !defined(OS_ANDROID) && !defined(OS_IOS)
  18 #include "base/test/multiprocess_test.h"
  19 #endif
  20
  21 namespace base {
  22 namespace debug {
  23
  24 #if defined(OS_POSIX) && !defined(OS_ANDROID) && !defined(OS_IOS)
  25 typedef MultiProcessTest StackTraceTest;
  26 #else
  27 typedef testing::Test StackTraceTest;
  28 #endif
  29
  30 // Note: On Linux, this test currently only fully works on Debug builds.
  31 // See comments in the #ifdef soup if you intend to change this.
  32 #if defined(OS_WIN)
  33 // Always fails on Windows: crbug.com/32070
  34 #define MAYBE_OutputToStream DISABLED_OutputToStream
  35 #else
  36 #define MAYBE_OutputToStream OutputToStream
  37 #endif
  38 #if !defined(__UCLIBC__)
  39 TEST_F(StackTraceTest, MAYBE_OutputToStream) {
  40   StackTrace trace;
  41
  42   // Dump the trace into a string.
  43   std::ostringstream os;
  44   trace.OutputToStream(&os);
  45   std::string backtrace_message = os.str();
  46
  47   // ToString() should produce the same output.
  48   EXPECT_EQ(backtrace_message, trace.ToString());
  49
  50 #if defined(OS_POSIX) && !defined(OS_MACOSX) && NDEBUG
  51   // Stack traces require an extra data table that bloats our binaries,
  52   // so they're turned off for release builds.  We stop the test here,
  53   // at least letting us verify that the calls don't crash.
  54   return;
  55 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX) && NDEBUG
  56
  57   size_t frames_found = 0;
  58   trace.Addresses(&frames_found);
  59   ASSERT_GE(frames_found, 5u) <<
  60       "No stack frames found.  Skipping rest of test.";
  61
  62   // Check if the output has symbol initialization warning.  If it does, fail.
  63   ASSERT_EQ(backtrace_message.find("Dumping unresolved backtrace"),
  64             std::string::npos) <<
  65       "Unable to resolve symbols.  Skipping rest of test.";
  66
  67 #if defined(OS_MACOSX)
  68 #if 0
  69   // Disabled due to -fvisibility=hidden in build config.
  70
  71   // Symbol resolution via the backtrace_symbol function does not work well
  72   // in OS X.
  73   // See this thread:
  74   //
  75   //    http://lists.apple.com/archives/darwin-dev/2009/Mar/msg00111.html
  76   //
  77   // Just check instead that we find our way back to the "start" symbol
  78   // which should be the first symbol in the trace.
  79   //
  80   // TODO(port): Find a more reliable way to resolve symbols.
  81
  82   // Expect to at least find main.
  83   EXPECT_TRUE(backtrace_message.find("start") != std::string::npos)
  84       << "Expected to find start in backtrace:\n"
  85       << backtrace_message;
  86
  87 #endif
  88 #elif defined(USE_SYMBOLIZE)
  89   // This branch is for gcc-compiled code, but not Mac due to the
  90   // above #if.
  91   // Expect a demangled symbol.
  92   EXPECT_TRUE(backtrace_message.find("testing::Test::Run()") !=
  93               std::string::npos)
  94       << "Expected a demangled symbol in backtrace:\n"
  95       << backtrace_message;
  96
  97 #elif 0
  98   // This is the fall-through case; it used to cover Windows.
  99   // But it's disabled because of varying buildbot configs;
 100   // some lack symbols.
 101
 102   // Expect to at least find main.
 103   EXPECT_TRUE(backtrace_message.find("main") != std::string::npos)
 104       << "Expected to find main in backtrace:\n"
 105       << backtrace_message;
 106
 107 #if defined(OS_WIN)
 108 // MSVC doesn't allow the use of C99's __func__ within C++, so we fake it with
 109 // MSVC's __FUNCTION__ macro.
 110 #define __func__ __FUNCTION__
 111 #endif
 112
 113   // Expect to find this function as well.
 114   // Note: This will fail if not linked with -rdynamic (aka -export_dynamic)
 115   EXPECT_TRUE(backtrace_message.find(__func__) != std::string::npos)
 116       << "Expected to find " << __func__ << " in backtrace:\n"
 117       << backtrace_message;
 118
 119 #endif  // define(OS_MACOSX)
 120 }
 121
 122 // The test is used for manual testing, e.g., to see the raw output.
 123 TEST_F(StackTraceTest, DebugOutputToStream) {
 124   StackTrace trace;
 125   std::ostringstream os;
 126   trace.OutputToStream(&os);
 127   VLOG(1) << os.str();
 128 }
 129
 130 // The test is used for manual testing, e.g., to see the raw output.
 131 TEST_F(StackTraceTest, DebugPrintBacktrace) {
 132   StackTrace().Print();
 133 }
 134 #endif  // !defined(__UCLIBC__)
 135
 136 #if defined(OS_POSIX) && !defined(OS_ANDROID)
 137 #if !defined(OS_IOS)
 138 MULTIPROCESS_TEST_MAIN(MismatchedMallocChildProcess) {
 139   char* pointer = new char[10];
 140   delete pointer;
 141   return 2;
 142 }
 143
 144 // Regression test for StackDumpingSignalHandler async-signal unsafety.
 145 // Combined with tcmalloc's debugallocation, that signal handler
 146 // and e.g. mismatched new[]/delete would cause a hang because
 147 // of re-entering malloc.
 148 TEST_F(StackTraceTest, AsyncSignalUnsafeSignalHandlerHang) {
 149   Process child = SpawnChild("MismatchedMallocChildProcess");
 150   ASSERT_TRUE(child.IsValid());
 151   ASSERT_TRUE(WaitForSingleProcess(child.Handle(),
 152                                    TestTimeouts::action_timeout()));
 153 }
 154 #endif  // !defined(OS_IOS)
 155
 156 namespace {
 157
 158 std::string itoa_r_wrapper(intptr_t i, size_t sz, int base, size_t padding) {
 159   char buffer[1024];
 160   CHECK_LE(sz, sizeof(buffer));
 161
 162   char* result = internal::itoa_r(i, buffer, sz, base, padding);
 163   EXPECT_TRUE(result);
 164   return std::string(buffer);
 165 }
 166
 167 }  // namespace
 168
 169 TEST_F(StackTraceTest, itoa_r) {
 170   EXPECT_EQ("0", itoa_r_wrapper(0, 128, 10, 0));
 171   EXPECT_EQ("-1", itoa_r_wrapper(-1, 128, 10, 0));
 172
 173   // Test edge cases.
 174   if (sizeof(intptr_t) == 4) {
 175     EXPECT_EQ("ffffffff", itoa_r_wrapper(-1, 128, 16, 0));
 176     EXPECT_EQ("-2147483648",
 177               itoa_r_wrapper(std::numeric_limits<intptr_t>::min(), 128, 10, 0));
 178     EXPECT_EQ("2147483647",
 179               itoa_r_wrapper(std::numeric_limits<intptr_t>::max(), 128, 10, 0));
 180
 181     EXPECT_EQ("80000000",
 182               itoa_r_wrapper(std::numeric_limits<intptr_t>::min(), 128, 16, 0));
 183     EXPECT_EQ("7fffffff",
 184               itoa_r_wrapper(std::numeric_limits<intptr_t>::max(), 128, 16, 0));
 185   } else if (sizeof(intptr_t) == 8) {
 186     EXPECT_EQ("ffffffffffffffff", itoa_r_wrapper(-1, 128, 16, 0));
 187     EXPECT_EQ("-9223372036854775808",
 188               itoa_r_wrapper(std::numeric_limits<intptr_t>::min(), 128, 10, 0));
 189     EXPECT_EQ("9223372036854775807",
 190               itoa_r_wrapper(std::numeric_limits<intptr_t>::max(), 128, 10, 0));
 191
 192     EXPECT_EQ("8000000000000000",
 193               itoa_r_wrapper(std::numeric_limits<intptr_t>::min(), 128, 16, 0));
 194     EXPECT_EQ("7fffffffffffffff",
 195               itoa_r_wrapper(std::numeric_limits<intptr_t>::max(), 128, 16, 0));
 196   } else {
 197     ADD_FAILURE() << "Missing test case for your size of intptr_t ("
 198                   << sizeof(intptr_t) << ")";
 199   }
 200
 201   // Test hex output.
 202   EXPECT_EQ("688", itoa_r_wrapper(0x688, 128, 16, 0));
 203   EXPECT_EQ("deadbeef", itoa_r_wrapper(0xdeadbeef, 128, 16, 0));
 204
 205   // Check that itoa_r respects passed buffer size limit.
 206   char buffer[1024];
 207   EXPECT_TRUE(internal::itoa_r(0xdeadbeef, buffer, 10, 16, 0));
 208   EXPECT_TRUE(internal::itoa_r(0xdeadbeef, buffer, 9, 16, 0));
 209   EXPECT_FALSE(internal::itoa_r(0xdeadbeef, buffer, 8, 16, 0));
 210   EXPECT_FALSE(internal::itoa_r(0xdeadbeef, buffer, 7, 16, 0));
 211   EXPECT_TRUE(internal::itoa_r(0xbeef, buffer, 5, 16, 4));
 212   EXPECT_FALSE(internal::itoa_r(0xbeef, buffer, 5, 16, 5));
 213   EXPECT_FALSE(internal::itoa_r(0xbeef, buffer, 5, 16, 6));
 214
 215   // Test padding.
 216   EXPECT_EQ("1", itoa_r_wrapper(1, 128, 10, 0));
 217   EXPECT_EQ("1", itoa_r_wrapper(1, 128, 10, 1));
 218   EXPECT_EQ("01", itoa_r_wrapper(1, 128, 10, 2));
 219   EXPECT_EQ("001", itoa_r_wrapper(1, 128, 10, 3));
 220   EXPECT_EQ("0001", itoa_r_wrapper(1, 128, 10, 4));
 221   EXPECT_EQ("00001", itoa_r_wrapper(1, 128, 10, 5));
 222   EXPECT_EQ("688", itoa_r_wrapper(0x688, 128, 16, 0));
 223   EXPECT_EQ("688", itoa_r_wrapper(0x688, 128, 16, 1));
 224   EXPECT_EQ("688", itoa_r_wrapper(0x688, 128, 16, 2));
 225   EXPECT_EQ("688", itoa_r_wrapper(0x688, 128, 16, 3));
 226   EXPECT_EQ("0688", itoa_r_wrapper(0x688, 128, 16, 4));
 227   EXPECT_EQ("00688", itoa_r_wrapper(0x688, 128, 16, 5));
 228 }
 229 #endif  // defined(OS_POSIX) && !defined(OS_ANDROID)
 230
 231 }  // namespace debug
 232 }  // namespace base