clang-tools-extra/clangd/support/Logger.cpp

   1 //===--- Logger.cpp - Logger interface for clangd -------------------------===//
   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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "support/Logger.h"
  10 #include "support/Trace.h"
  11 #include "llvm/Support/Chrono.h"
  12 #include "llvm/Support/Error.h"
  13 #include "llvm/Support/FormatVariadic.h"
  14 #include "llvm/Support/raw_ostream.h"
  15 #include <mutex>
  16
  17 namespace clang {
  18 namespace clangd {
  19
  20 namespace {
  21 Logger *L = nullptr;
  22 } // namespace
  23
  24 LoggingSession::LoggingSession(clangd::Logger &Instance) {
  25   assert(!L);
  26   L = &Instance;
  27 }
  28
  29 LoggingSession::~LoggingSession() { L = nullptr; }
  30
  31 void detail::logImpl(Logger::Level Level, const char *Fmt,
  32                      const llvm::formatv_object_base &Message) {
  33   if (L)
  34     L->log(Level, Fmt, Message);
  35   else {
  36     static std::mutex Mu;
  37     std::lock_guard<std::mutex> Guard(Mu);
  38     llvm::errs() << Message << "\n";
  39   }
  40 }
  41
  42 const char *detail::debugType(const char *Filename) {
  43   if (const char *Slash = strrchr(Filename, '/'))
  44     return Slash + 1;
  45   if (const char *Backslash = strrchr(Filename, '\\'))
  46     return Backslash + 1;
  47   return Filename;
  48 }
  49
  50 void StreamLogger::log(Logger::Level Level, const char *Fmt,
  51                        const llvm::formatv_object_base &Message) {
  52   if (Level < MinLevel)
  53     return;
  54   llvm::sys::TimePoint<> Timestamp = std::chrono::system_clock::now();
  55   trace::log(Message);
  56   std::lock_guard<std::mutex> Guard(StreamMutex);
  57   Logs << llvm::formatv("{0}[{1:%H:%M:%S.%L}] {2}\n", indicator(Level),
  58                         Timestamp, Message);
  59   Logs.flush();
  60 }
  61
  62 namespace {
  63 // Like llvm::StringError but with fewer options and no gratuitous copies.
  64 class SimpleStringError : public llvm::ErrorInfo<SimpleStringError> {
  65   std::error_code EC;
  66   std::string Message;
  67
  68 public:
  69   SimpleStringError(std::error_code EC, std::string &&Message)
  70       : EC(EC), Message(std::move(Message)) {}
  71   void log(llvm::raw_ostream &OS) const override { OS << Message; }
  72   std::string message() const override { return Message; }
  73   std::error_code convertToErrorCode() const override { return EC; }
  74   static char ID;
  75 };
  76 char SimpleStringError::ID;
  77
  78 } // namespace
  79
  80 llvm::Error detail::error(std::error_code EC, std::string &&Msg) {
  81   return llvm::make_error<SimpleStringError>(EC, std::move(Msg));
  82 }
  83
  84 } // namespace clangd
  85 } // namespace clang