contrib/llvm-project/lldb/tools/lldb-server/LLDBServerUtilities.cpp

   1 //===-- LLDBServerUtilities.cpp ---------------------------------*- C++ -*-===//
   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 "LLDBServerUtilities.h"
  10
  11 #include "lldb/Utility/Args.h"
  12 #include "lldb/Utility/Log.h"
  13 #include "lldb/Utility/StreamString.h"
  14
  15 #include "llvm/ADT/SmallVector.h"
  16 #include "llvm/ADT/StringRef.h"
  17 #include "llvm/Support/FileSystem.h"
  18
  19 using namespace lldb;
  20 using namespace lldb_private::lldb_server;
  21 using namespace llvm;
  22
  23 static std::shared_ptr<raw_ostream> GetLogStream(StringRef log_file) {
  24   if (!log_file.empty()) {
  25     std::error_code EC;
  26     std::shared_ptr<raw_ostream> stream_sp = std::make_shared<raw_fd_ostream>(
  27         log_file, EC, sys::fs::F_Text | sys::fs::F_Append);
  28     if (!EC)
  29       return stream_sp;
  30     errs() << llvm::formatv(
  31         "Failed to open log file `{0}`: {1}\nWill log to stderr instead.\n",
  32         log_file, EC.message());
  33   }
  34   // No need to delete the stderr stream.
  35   return std::shared_ptr<raw_ostream>(&errs(), [](raw_ostream *) {});
  36 }
  37
  38 bool LLDBServerUtilities::SetupLogging(const std::string &log_file,
  39                                        const StringRef &log_channels,
  40                                        uint32_t log_options) {
  41
  42   auto log_stream_sp = GetLogStream(log_file);
  43
  44   SmallVector<StringRef, 32> channel_array;
  45   log_channels.split(channel_array, ":", /*MaxSplit*/ -1, /*KeepEmpty*/ false);
  46   for (auto channel_with_categories : channel_array) {
  47     std::string error;
  48     llvm::raw_string_ostream error_stream(error);
  49     Args channel_then_categories(channel_with_categories);
  50     std::string channel(channel_then_categories.GetArgumentAtIndex(0));
  51     channel_then_categories.Shift(); // Shift off the channel
  52
  53     bool success = Log::EnableLogChannel(
  54         log_stream_sp, log_options, channel,
  55         channel_then_categories.GetArgumentArrayRef(), error_stream);
  56     if (!success) {
  57       errs() << formatv("Unable to setup logging for channel \"{0}\": {1}",
  58                         channel, error_stream.str());
  59       return false;
  60     }
  61   }
  62   return true;
  63 }