lldb/source/Utility/Instrumentation.cpp

   1 //===-- Instrumentation.cpp -----------------------------------------------===//
   2 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   3 // See https://llvm.org/LICENSE.txt for license information.
   4 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   5 //
   6 //===----------------------------------------------------------------------===//
   7
   8 #include "lldb/Utility/Instrumentation.h"
   9 #include "lldb/Utility/LLDBLog.h"
  10 #include "llvm/Support/Signposts.h"
  11
  12 #include <cstdio>
  13 #include <cstdlib>
  14 #include <limits>
  15 #include <thread>
  16
  17 using namespace lldb_private;
  18 using namespace lldb_private::instrumentation;
  19
  20 // Whether we're currently across the API boundary.
  21 static thread_local bool g_global_boundary = false;
  22
  23 // Instrument SB API calls with signposts when supported.
  24 static llvm::ManagedStatic<llvm::SignpostEmitter> g_api_signposts;
  25
  26 Instrumenter::Instrumenter(llvm::StringRef pretty_func,
  27                            std::string &&pretty_args)
  28     : m_pretty_func(pretty_func) {
  29   if (!g_global_boundary) {
  30     g_global_boundary = true;
  31     m_local_boundary = true;
  32     g_api_signposts->startInterval(this, m_pretty_func);
  33   }
  34   LLDB_LOG(GetLog(LLDBLog::API), "[{0}] {1} ({2})",
  35            m_local_boundary ? "external" : "internal", m_pretty_func,
  36            pretty_args);
  37 }
  38
  39 Instrumenter::~Instrumenter() {
  40   if (m_local_boundary) {
  41     g_global_boundary = false;
  42     g_api_signposts->endInterval(this, m_pretty_func);
  43   }
  44 }