1 // Copyright (c) 2005, Google Inc. 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are 6 // met: 7 // 8 // * Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // * Redistributions in binary form must reproduce the above 11 // copyright notice, this list of conditions and the following disclaimer 12 // in the documentation and/or other materials provided with the 13 // distribution. 14 // * Neither the name of Google Inc. nor the names of its 15 // contributors may be used to endorse or promote products derived from 16 // this software without specific prior written permission. 17 // 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30 // --- 31 // Sanjay Ghemawat <opensource (at) google.com> 32 33 #include <config.h> 34 #include "internal_logging.h" 35 #include <stdarg.h> // for va_end, va_start 36 #include <stdio.h> // for vsnprintf, va_list, etc 37 #include <stdlib.h> // for abort 38 #include <string.h> // for strlen, memcpy 39 #ifdef HAVE_UNISTD_H 40 #include <unistd.h> // for write() 41 #endif 42 43 #include <gperftools/malloc_extension.h> 44 #include "base/abort.h" 45 #include "base/logging.h" // for perftools_vsnprintf 46 #include "base/spinlock.h" // for SpinLockHolder, SpinLock 47 48 static const int kLogBufSize = 800; 49 50 // Variables for storing crash output. Allocated statically since we 51 // may not be able to heap-allocate while crashing. 52 static SpinLock crash_lock(base::LINKER_INITIALIZED); 53 static bool crashed = false; 54 static const int kStatsBufferSize = 16 << 10; 55 static char stats_buffer[kStatsBufferSize] = { 0 }; 56 57 namespace tcmalloc { 58 59 static void WriteMessage(const char* msg, int length) { 60 write(STDERR_FILENO, msg, length); 61 } 62 63 void (*log_message_writer)(const char* msg, int length) = WriteMessage; 64 65 66 class Logger { 67 public: 68 bool Add(const LogItem& item); 69 bool AddStr(const char* str, int n); 70 bool AddNum(uint64_t num, int base); // base must be 10 or 16. 71 72 static const int kBufSize = 200; 73 char* p_; 74 char* end_; 75 char buf_[kBufSize]; 76 }; 77 78 void Log(LogMode mode, const char* filename, int line, 79 LogItem a, LogItem b, LogItem c, LogItem d) { 80 Logger state; 81 state.p_ = state.buf_; 82 state.end_ = state.buf_ + sizeof(state.buf_); 83 state.AddStr(filename, strlen(filename)) 84 && state.AddStr(":", 1) 85 && state.AddNum(line, 10) 86 && state.AddStr("]", 1) 87 && state.Add(a) 88 && state.Add(b) 89 && state.Add(c) 90 && state.Add(d); 91 92 // Teminate with newline 93 if (state.p_ >= state.end_) { 94 state.p_ = state.end_ - 1; 95 } 96 *state.p_ = '\n'; 97 state.p_++; 98 99 int msglen = state.p_ - state.buf_; 100 if (mode == kLog) { 101 (*log_message_writer)(state.buf_, msglen); 102 return; 103 } 104 105 bool first_crash = false; 106 { 107 SpinLockHolder l(&crash_lock); 108 if (!crashed) { 109 crashed = true; 110 first_crash = true; 111 } 112 } 113 114 (*log_message_writer)(state.buf_, msglen); 115 if (first_crash && mode == kCrashWithStats) { 116 MallocExtension::instance()->GetStats(stats_buffer, kStatsBufferSize); 117 (*log_message_writer)(stats_buffer, strlen(stats_buffer)); 118 } 119 120 Abort(); 121 } 122 123 bool Logger::Add(const LogItem& item) { 124 // Separate items with spaces 125 if (p_ < end_) { 126 *p_ = ' '; 127 p_++; 128 } 129 130 switch (item.tag_) { 131 case LogItem::kStr: 132 return AddStr(item.u_.str, strlen(item.u_.str)); 133 case LogItem::kUnsigned: 134 return AddNum(item.u_.unum, 10); 135 case LogItem::kSigned: 136 if (item.u_.snum < 0) { 137 // The cast to uint64_t is intentionally before the negation 138 // so that we do not attempt to negate -2^63. 139 return AddStr("-", 1) 140 && AddNum(- static_cast<uint64_t>(item.u_.snum), 10); 141 } else { 142 return AddNum(static_cast<uint64_t>(item.u_.snum), 10); 143 } 144 case LogItem::kPtr: 145 return AddStr("0x", 2) 146 && AddNum(reinterpret_cast<uintptr_t>(item.u_.ptr), 16); 147 default: 148 return false; 149 } 150 } 151 152 bool Logger::AddStr(const char* str, int n) { 153 if (end_ - p_ < n) { 154 return false; 155 } else { 156 memcpy(p_, str, n); 157 p_ += n; 158 return true; 159 } 160 } 161 162 bool Logger::AddNum(uint64_t num, int base) { 163 static const char kDigits[] = "0123456789abcdef"; 164 char space[22]; // more than enough for 2^64 in smallest supported base (10) 165 char* end = space + sizeof(space); 166 char* pos = end; 167 do { 168 pos--; 169 *pos = kDigits[num % base]; 170 num /= base; 171 } while (num > 0 && pos > space); 172 return AddStr(pos, end - pos); 173 } 174 175 } // end tcmalloc namespace 176 177 void TCMalloc_Printer::printf(const char* format, ...) { 178 if (left_ > 0) { 179 va_list ap; 180 va_start(ap, format); 181 const int r = perftools_vsnprintf(buf_, left_, format, ap); 182 va_end(ap); 183 if (r < 0) { 184 // Perhaps an old glibc that returns -1 on truncation? 185 left_ = 0; 186 } else if (r > left_) { 187 // Truncation 188 left_ = 0; 189 } else { 190 left_ -= r; 191 buf_ += r; 192 } 193 } 194 } 195
