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1//===-- Log.cpp -----------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "lldb/Utility/Log.h"10#include "lldb/Utility/VASPrintf.h"11 12#include "llvm/ADT/SmallString.h"13#include "llvm/ADT/Twine.h"14#include "llvm/ADT/iterator.h"15 16#include "llvm/Support/Casting.h"17#include "llvm/Support/Chrono.h"18#include "llvm/Support/ManagedStatic.h"19#include "llvm/Support/Path.h"20#include "llvm/Support/Signals.h"21#include "llvm/Support/Threading.h"22#include "llvm/Support/raw_ostream.h"23 24#include <chrono>25#include <cstdarg>26#include <mutex>27#include <utility>28 29#include <cassert>30#if defined(_WIN32)31#include <process.h>32#else33#include <unistd.h>34#endif35 36using namespace lldb_private;37 38char LogHandler::ID;39char StreamLogHandler::ID;40char CallbackLogHandler::ID;41char RotatingLogHandler::ID;42char TeeLogHandler::ID;43 44llvm::ManagedStatic<Log::ChannelMap> Log::g_channel_map;45 46// The error log is used by LLDB_LOG_ERROR. If the given log channel passed to47// LLDB_LOG_ERROR is not enabled, error messages are logged to the error log.48static std::atomic<Log *> g_error_log = nullptr;49 50void Log::ForEachCategory(51    const Log::ChannelMap::value_type &entry,52    llvm::function_ref<void(llvm::StringRef, llvm::StringRef)> lambda) {53  lambda("all", "all available logging categories");54  lambda("default", "default set of logging categories");55  for (const auto &category : entry.second.m_channel.categories)56    lambda(category.name, category.description);57}58 59void Log::ListCategories(llvm::raw_ostream &stream,60                         const ChannelMap::value_type &entry) {61  stream << llvm::formatv("Logging categories for '{0}':\n", entry.first());62  ForEachCategory(entry,63                  [&stream](llvm::StringRef name, llvm::StringRef description) {64                    stream << llvm::formatv("  {0} - {1}\n", name, description);65                  });66}67 68Log::MaskType Log::GetFlags(llvm::raw_ostream &stream,69                            const ChannelMap::value_type &entry,70                            llvm::ArrayRef<const char *> categories) {71  bool list_categories = false;72  Log::MaskType flags = 0;73  for (const char *category : categories) {74    if (llvm::StringRef("all").equals_insensitive(category)) {75      flags |= std::numeric_limits<Log::MaskType>::max();76      continue;77    }78    if (llvm::StringRef("default").equals_insensitive(category)) {79      flags |= entry.second.m_channel.default_flags;80      continue;81    }82    auto cat = llvm::find_if(entry.second.m_channel.categories,83                             [&](const Log::Category &c) {84                               return c.name.equals_insensitive(category);85                             });86    if (cat != entry.second.m_channel.categories.end()) {87      flags |= cat->flag;88      continue;89    }90    stream << llvm::formatv("error: unrecognized log category '{0}'\n",91                            category);92    list_categories = true;93  }94  if (list_categories)95    ListCategories(stream, entry);96  return flags;97}98 99void Log::Enable(const std::shared_ptr<LogHandler> &handler_sp,100                 std::optional<Log::MaskType> flags, uint32_t options) {101  llvm::sys::ScopedWriter lock(m_mutex);102 103  if (!flags)104    flags = m_channel.default_flags;105 106  MaskType mask = m_mask.fetch_or(*flags, std::memory_order_relaxed);107  if (mask | *flags) {108    m_options.store(options, std::memory_order_relaxed);109    m_handler = handler_sp;110    m_channel.log_ptr.store(this, std::memory_order_relaxed);111  }112}113 114void Log::Disable(std::optional<Log::MaskType> flags) {115  llvm::sys::ScopedWriter lock(m_mutex);116 117  if (!flags)118    flags = std::numeric_limits<MaskType>::max();119 120  MaskType mask = m_mask.fetch_and(~(*flags), std::memory_order_relaxed);121  if (!(mask & ~(*flags))) {122    m_handler.reset();123    m_channel.log_ptr.store(nullptr, std::memory_order_relaxed);124  }125}126 127bool Log::Dump(llvm::raw_ostream &output_stream) {128  llvm::sys::ScopedReader lock(m_mutex);129  if (RotatingLogHandler *handler =130          llvm::dyn_cast_or_null<RotatingLogHandler>(m_handler.get())) {131    handler->Dump(output_stream);132    return true;133  }134  return false;135}136 137const Flags Log::GetOptions() const {138  return m_options.load(std::memory_order_relaxed);139}140 141Log::MaskType Log::GetMask() const {142  return m_mask.load(std::memory_order_relaxed);143}144 145void Log::PutCString(const char *cstr) { PutString(cstr); }146 147void Log::PutString(llvm::StringRef str) {148  std::string FinalMessage;149  llvm::raw_string_ostream Stream(FinalMessage);150  WriteHeader(Stream, "", "");151  Stream << str << "\n";152  WriteMessage(FinalMessage);153}154 155// Simple variable argument logging with flags.156void Log::Printf(const char *format, ...) {157  va_list args;158  va_start(args, format);159  VAPrintf(format, args);160  va_end(args);161}162 163void Log::VAPrintf(const char *format, va_list args) {164  llvm::SmallString<64> Content;165  lldb_private::VASprintf(Content, format, args);166  PutString(Content);167}168 169void Log::Formatf(llvm::StringRef file, llvm::StringRef function,170                  const char *format, ...) {171  va_list args;172  va_start(args, format);173  VAFormatf(file, function, format, args);174  va_end(args);175}176 177void Log::VAFormatf(llvm::StringRef file, llvm::StringRef function,178                    const char *format, va_list args) {179  llvm::SmallString<64> Content;180  lldb_private::VASprintf(Content, format, args);181  Format(file, function, llvm::formatv("{0}", Content));182}183 184// Printing of errors that are not fatal.185void Log::Error(const char *format, ...) {186  va_list args;187  va_start(args, format);188  VAError(format, args);189  va_end(args);190}191 192void Log::VAError(const char *format, va_list args) {193  llvm::SmallString<64> Content;194  VASprintf(Content, format, args);195 196  Printf("error: %s", Content.c_str());197}198 199// Printing of warnings that are not fatal only if verbose mode is enabled.200void Log::Verbose(const char *format, ...) {201  if (!GetVerbose())202    return;203 204  va_list args;205  va_start(args, format);206  VAPrintf(format, args);207  va_end(args);208}209 210// Printing of warnings that are not fatal.211void Log::Warning(const char *format, ...) {212  llvm::SmallString<64> Content;213  va_list args;214  va_start(args, format);215  VASprintf(Content, format, args);216  va_end(args);217 218  Printf("warning: %s", Content.c_str());219}220 221void Log::Register(llvm::StringRef name, Channel &channel) {222  auto iter = g_channel_map->try_emplace(name, channel);223  assert(iter.second == true);224  UNUSED_IF_ASSERT_DISABLED(iter);225}226 227void Log::Unregister(llvm::StringRef name) {228  auto iter = g_channel_map->find(name);229  assert(iter != g_channel_map->end());230  iter->second.Disable(std::numeric_limits<MaskType>::max());231  g_channel_map->erase(iter);232}233 234bool Log::EnableLogChannel(const std::shared_ptr<LogHandler> &log_handler_sp,235                           uint32_t log_options, llvm::StringRef channel,236                           llvm::ArrayRef<const char *> categories,237                           llvm::raw_ostream &error_stream) {238  auto iter = g_channel_map->find(channel);239  if (iter == g_channel_map->end()) {240    error_stream << llvm::formatv("Invalid log channel '{0}'.\n", channel);241    return false;242  }243 244  auto flags = categories.empty() ? std::optional<MaskType>{}245                                  : GetFlags(error_stream, *iter, categories);246 247  iter->second.Enable(log_handler_sp, flags, log_options);248  return true;249}250 251bool Log::DisableLogChannel(llvm::StringRef channel,252                            llvm::ArrayRef<const char *> categories,253                            llvm::raw_ostream &error_stream) {254  auto iter = g_channel_map->find(channel);255  if (iter == g_channel_map->end()) {256    error_stream << llvm::formatv("Invalid log channel '{0}'.\n", channel);257    return false;258  }259 260  auto flags = categories.empty() ? std::optional<MaskType>{}261                                  : GetFlags(error_stream, *iter, categories);262 263  iter->second.Disable(flags);264  return true;265}266 267bool Log::DumpLogChannel(llvm::StringRef channel,268                         llvm::raw_ostream &output_stream,269                         llvm::raw_ostream &error_stream) {270  auto iter = g_channel_map->find(channel);271  if (iter == g_channel_map->end()) {272    error_stream << llvm::formatv("Invalid log channel '{0}'.\n", channel);273    return false;274  }275  if (!iter->second.Dump(output_stream)) {276    error_stream << llvm::formatv(277        "log channel '{0}' does not support dumping.\n", channel);278    return false;279  }280  return true;281}282 283bool Log::ListChannelCategories(llvm::StringRef channel,284                                llvm::raw_ostream &stream) {285  auto ch = g_channel_map->find(channel);286  if (ch == g_channel_map->end()) {287    stream << llvm::formatv("Invalid log channel '{0}'.\n", channel);288    return false;289  }290  ListCategories(stream, *ch);291  return true;292}293 294void Log::DisableAllLogChannels() {295  for (auto &entry : *g_channel_map)296    entry.second.Disable(std::numeric_limits<MaskType>::max());297}298 299void Log::ForEachChannelCategory(300    llvm::StringRef channel,301    llvm::function_ref<void(llvm::StringRef, llvm::StringRef)> lambda) {302  auto ch = g_channel_map->find(channel);303  if (ch == g_channel_map->end())304    return;305 306  ForEachCategory(*ch, lambda);307}308 309std::vector<llvm::StringRef> Log::ListChannels() {310  std::vector<llvm::StringRef> result;311  for (const auto &channel : *g_channel_map)312    result.push_back(channel.first());313  return result;314}315 316void Log::ListAllLogChannels(llvm::raw_ostream &stream) {317  if (g_channel_map->empty()) {318    stream << "No logging channels are currently registered.\n";319    return;320  }321 322  for (const auto &channel : *g_channel_map)323    ListCategories(stream, channel);324}325 326bool Log::GetVerbose() const {327  return m_options.load(std::memory_order_relaxed) & LLDB_LOG_OPTION_VERBOSE;328}329 330void Log::WriteHeader(llvm::raw_ostream &OS, llvm::StringRef file,331                      llvm::StringRef function) {332  Flags options = GetOptions();333  static uint32_t g_sequence_id = 0;334  // Add a sequence ID if requested335  if (options.Test(LLDB_LOG_OPTION_PREPEND_SEQUENCE))336    OS << ++g_sequence_id << " ";337 338  // Timestamp if requested339  if (options.Test(LLDB_LOG_OPTION_PREPEND_TIMESTAMP)) {340    auto now = std::chrono::duration<double>(341        std::chrono::system_clock::now().time_since_epoch());342    OS << llvm::formatv("{0:f9} ", now.count());343  }344 345  // Add the process and thread if requested346  if (options.Test(LLDB_LOG_OPTION_PREPEND_PROC_AND_THREAD))347    OS << llvm::formatv("[{0,0+4}/{1,0+4}] ", getpid(),348                        llvm::get_threadid());349 350  // Add the thread name if requested351  if (options.Test(LLDB_LOG_OPTION_PREPEND_THREAD_NAME)) {352    llvm::SmallString<32> thread_name;353    llvm::get_thread_name(thread_name);354 355    llvm::SmallString<12> format_str;356    llvm::raw_svector_ostream format_os(format_str);357    format_os << "{0,-" << llvm::alignTo<16>(thread_name.size()) << "} ";358    OS << llvm::formatv(format_str.c_str(), thread_name);359  }360 361  if (options.Test(LLDB_LOG_OPTION_BACKTRACE))362    llvm::sys::PrintStackTrace(OS);363 364  if (options.Test(LLDB_LOG_OPTION_PREPEND_FILE_FUNCTION) &&365      (!file.empty() || !function.empty())) {366    file = llvm::sys::path::filename(file).take_front(40);367    function = function.take_front(40);368    OS << llvm::formatv("{0,-60:60} ", (file + ":" + function).str());369  }370}371 372// If we have a callback registered, then we call the logging callback. If we373// have a valid file handle, we also log to the file.374void Log::WriteMessage(llvm::StringRef message) {375  // Make a copy of our stream shared pointer in case someone disables our log376  // while we are logging and releases the stream377  auto handler_sp = GetHandler();378  if (!handler_sp)379    return;380  handler_sp->Emit(message);381}382 383void Log::Format(llvm::StringRef file, llvm::StringRef function,384                 const llvm::formatv_object_base &payload) {385  std::string message_string;386  llvm::raw_string_ostream message(message_string);387  WriteHeader(message, file, function);388  message << payload << "\n";389  WriteMessage(message_string);390}391 392StreamLogHandler::StreamLogHandler(int fd, bool should_close,393                                   size_t buffer_size)394    : m_stream(fd, should_close, buffer_size == 0) {395  if (buffer_size > 0)396    m_stream.SetBufferSize(buffer_size);397}398 399StreamLogHandler::~StreamLogHandler() { Flush(); }400 401void StreamLogHandler::Flush() {402  std::lock_guard<std::mutex> guard(m_mutex);403  m_stream.flush();404}405 406void StreamLogHandler::Emit(llvm::StringRef message) {407  if (m_stream.GetBufferSize() > 0) {408    std::lock_guard<std::mutex> guard(m_mutex);409    m_stream << message;410  } else {411    m_stream << message;412  }413}414 415CallbackLogHandler::CallbackLogHandler(lldb::LogOutputCallback callback,416                                       void *baton)417    : m_callback(callback), m_baton(baton) {}418 419void CallbackLogHandler::Emit(llvm::StringRef message) {420  m_callback(message.data(), m_baton);421}422 423RotatingLogHandler::RotatingLogHandler(size_t size)424    : m_messages(std::make_unique<std::string[]>(size)), m_size(size) {}425 426void RotatingLogHandler::Emit(llvm::StringRef message) {427  std::lock_guard<std::mutex> guard(m_mutex);428  ++m_total_count;429  const size_t index = m_next_index;430  m_next_index = NormalizeIndex(index + 1);431  m_messages[index] = message.str();432}433 434size_t RotatingLogHandler::NormalizeIndex(size_t i) const { return i % m_size; }435 436size_t RotatingLogHandler::GetNumMessages() const {437  return m_total_count < m_size ? m_total_count : m_size;438}439 440size_t RotatingLogHandler::GetFirstMessageIndex() const {441  return m_total_count < m_size ? 0 : m_next_index;442}443 444void RotatingLogHandler::Dump(llvm::raw_ostream &stream) const {445  std::lock_guard<std::mutex> guard(m_mutex);446  const size_t start_idx = GetFirstMessageIndex();447  const size_t stop_idx = start_idx + GetNumMessages();448  for (size_t i = start_idx; i < stop_idx; ++i) {449    const size_t idx = NormalizeIndex(i);450    stream << m_messages[idx];451  }452  stream.flush();453}454 455TeeLogHandler::TeeLogHandler(std::shared_ptr<LogHandler> first_log_handler,456                             std::shared_ptr<LogHandler> second_log_handler)457    : m_first_log_handler(first_log_handler),458      m_second_log_handler(second_log_handler) {459  assert(m_first_log_handler && "first log handler must be valid");460  assert(m_second_log_handler && "second log handler must be valid");461}462 463void TeeLogHandler::Emit(llvm::StringRef message) {464  m_first_log_handler->Emit(message);465  m_second_log_handler->Emit(message);466}467 468void lldb_private::SetLLDBErrorLog(Log *log) { g_error_log.store(log); }469 470Log *lldb_private::GetLLDBErrorLog() { return g_error_log; }471