Revert "Allow signposts to take advantage of deferred string substitution"

I forgot to make the LLDB macro conditional on Linux.

This reverts commit 541ccd1.

Author: adrian-prantl

lldb/include/lldb/Utility/Timer.h

@@ -10,16 +10,10 @@
 #define LLDB_UTILITY_TIMER_H
 
 #include "lldb/lldb-defines.h"
-#include "llvm/ADT/ScopeExit.h"
 #include "llvm/Support/Chrono.h"
-#include "llvm/Support/Signposts.h"
 #include <atomic>
 #include <cstdint>
 
-namespace llvm {
-  class SignpostEmitter;
-}
-
 namespace lldb_private {
 class Stream;
 
@@ -78,28 +72,15 @@ class Timer {
   const Timer &operator=(const Timer &) = delete;
 };
 
-llvm::SignpostEmitter &GetSignposts();
-
 } // namespace lldb_private
 
 // Use a format string because LLVM_PRETTY_FUNCTION might not be a string
 // literal.
 #define LLDB_SCOPED_TIMER()                                                    \
   static ::lldb_private::Timer::Category _cat(LLVM_PRETTY_FUNCTION);           \
-  ::lldb_private::Timer _scoped_timer(_cat, "%s", LLVM_PRETTY_FUNCTION);       \
-  SIGNPOST_EMITTER_START_INTERVAL(::lldb_private::GetSignposts(),              \
-                                  &_scoped_timer, "%s", LLVM_PRETTY_FUNCTION); \
-  auto _scoped_signpost = llvm::make_scope_exit([&_scoped_timer]() {           \
-    ::lldb_private::GetSignposts().endInterval(&_scoped_timer);                \
-  })
-
-#define LLDB_SCOPED_TIMERF(FMT, ...)                                           \
+  ::lldb_private::Timer _scoped_timer(_cat, "%s", LLVM_PRETTY_FUNCTION)
+#define LLDB_SCOPED_TIMERF(...)                                                \
   static ::lldb_private::Timer::Category _cat(LLVM_PRETTY_FUNCTION);           \
-  ::lldb_private::Timer _scoped_timer(_cat, FMT, __VA_ARGS__);                 \
-  SIGNPOST_EMITTER_START_INTERVAL(::lldb_private::GetSignposts(),              \
-                                  &_scoped_timer, FMT, __VA_ARGS__);           \
-  auto _scoped_signpost = llvm::make_scope_exit([&_scoped_timer]() {           \
-    ::lldb_private::GetSignposts().endInterval(&_scoped_timer);                \
-  })
+  ::lldb_private::Timer _scoped_timer(_cat, __VA_ARGS__)
 
 #endif // LLDB_UTILITY_TIMER_H

lldb/source/Utility/Timer.cpp

@@ -33,8 +33,6 @@ static std::atomic<Timer::Category *> g_categories;
 /// Allows llvm::Timer to emit signposts when supported.
 static llvm::ManagedStatic<llvm::SignpostEmitter> Signposts;
 
-llvm::SignpostEmitter &lldb_private::GetSignposts() { return *Signposts; }
-
 std::atomic<bool> Timer::g_quiet(true);
 std::atomic<unsigned> Timer::g_display_depth(0);
 static std::mutex &GetFileMutex() {
@@ -61,6 +59,7 @@ void Timer::SetQuiet(bool value) { g_quiet = value; }
 
 Timer::Timer(Timer::Category &category, const char *format, ...)
     : m_category(category), m_total_start(std::chrono::steady_clock::now()) {
+  Signposts->startInterval(this, m_category.GetName());
   TimerStack &stack = GetTimerStackForCurrentThread();
 
   stack.push_back(this);
@@ -87,6 +86,8 @@ Timer::~Timer() {
   auto total_dur = stop_time - m_total_start;
   auto timer_dur = total_dur - m_child_duration;
 
+  Signposts->endInterval(this, m_category.GetName());
+
   TimerStack &stack = GetTimerStackForCurrentThread();
   if (g_quiet && stack.size() <= g_display_depth) {
     std::lock_guard<std::mutex> lock(GetFileMutex());

llvm/include/llvm/Support/Signposts.h

@@ -18,17 +18,8 @@
 #define LLVM_SUPPORT_SIGNPOSTS_H
 
 #include "llvm/ADT/StringRef.h"
-#include "llvm/Config/config.h"
 #include <memory>
 
-#if LLVM_SUPPORT_XCODE_SIGNPOSTS
-#include <Availability.h>
-#include <os/signpost.h>
-#endif
-
-#define SIGNPOSTS_AVAILABLE()                                                  \
-  __builtin_available(macos 10.14, iOS 12, tvOS 12, watchOS 5, *)
-
 namespace llvm {
 class SignpostEmitterImpl;
 
@@ -45,27 +36,8 @@ class SignpostEmitter {
 
   /// Begin a signposted interval for a given object.
   void startInterval(const void *O, StringRef Name);
-
-#if LLVM_SUPPORT_XCODE_SIGNPOSTS
-  os_log_t &getLogger() const;
-  os_signpost_id_t getSignpostForObject(const void *O);
-#endif
-    
-  /// A macro to take advantage of the special format string handling
-  /// in the os_signpost API. The format string substitution is
-  /// deferred to the log consumer and done outside of the
-  /// application.
-#define SIGNPOST_EMITTER_START_INTERVAL(SIGNPOST_EMITTER, O, ...)              \
-  do {                                                                         \
-    if ((SIGNPOST_EMITTER).isEnabled())                                        \
-      if (SIGNPOSTS_AVAILABLE())                                               \
-        os_signpost_interval_begin((SIGNPOST_EMITTER).getLogger(),             \
-                                   (SIGNPOST_EMITTER).getSignpostForObject(O), \
-                                   "LLVM Timers", __VA_ARGS__);                \
-  } while (0)
-
   /// End a signposted interval for a given object.
-  void endInterval(const void *O);
+  void endInterval(const void *O, StringRef Name);
 };
 
 } // end namespace llvm

llvm/lib/Support/Signposts.cpp

@@ -10,14 +10,19 @@
 #include "llvm/Support/Signposts.h"
 #include "llvm/Support/Timer.h"
 
+#include "llvm/Config/config.h"
 #if LLVM_SUPPORT_XCODE_SIGNPOSTS
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/Support/Mutex.h"
+#include <Availability.h>
+#include <os/signpost.h>
 #endif // if LLVM_SUPPORT_XCODE_SIGNPOSTS
 
 using namespace llvm;
 
 #if LLVM_SUPPORT_XCODE_SIGNPOSTS
+#define SIGNPOSTS_AVAILABLE()                                                  \
+  __builtin_available(macos 10.14, iOS 12, tvOS 12, watchOS 5, *)
 namespace {
 os_log_t *LogCreator() {
   os_log_t *X = new os_log_t;
@@ -35,13 +40,13 @@ struct LogDeleter {
 namespace llvm {
 class SignpostEmitterImpl {
   using LogPtrTy = std::unique_ptr<os_log_t, LogDeleter>;
+  using LogTy = LogPtrTy::element_type;
 
   LogPtrTy SignpostLog;
   DenseMap<const void *, os_signpost_id_t> Signposts;
   sys::SmartMutex<true> Mutex;
 
-public:
-  os_log_t &getLogger() const { return *SignpostLog; }
+  LogTy &getLogger() const { return *SignpostLog; }
   os_signpost_id_t getSignpostForObject(const void *O) {
     sys::SmartScopedLock<true> Lock(Mutex);
     const auto &I = Signposts.find(O);
@@ -55,6 +60,7 @@ class SignpostEmitterImpl {
     return Inserted.first->second;
   }
 
+public:
   SignpostEmitterImpl() : SignpostLog(LogCreator()) {}
 
   bool isEnabled() const {
@@ -73,7 +79,7 @@ class SignpostEmitterImpl {
     }
   }
 
-  void endInterval(const void *O) {
+  void endInterval(const void *O, llvm::StringRef Name) {
     if (isEnabled()) {
       if (SIGNPOSTS_AVAILABLE()) {
         // Both strings used here are required to be constant literal strings.
@@ -119,17 +125,10 @@ void SignpostEmitter::startInterval(const void *O, StringRef Name) {
 #endif // if !HAVE_ANY_SIGNPOST_IMPL
 }
 
-#if HAVE_ANY_SIGNPOST_IMPL
-os_log_t &SignpostEmitter::getLogger() const { return Impl->getLogger(); }
-os_signpost_id_t SignpostEmitter::getSignpostForObject(const void *O) {
-  return Impl->getSignpostForObject(O);
-}
-#endif
-
-void SignpostEmitter::endInterval(const void *O) {
+void SignpostEmitter::endInterval(const void *O, StringRef Name) {
 #if HAVE_ANY_SIGNPOST_IMPL
   if (Impl == nullptr)
     return;
-  Impl->endInterval(O);
+  Impl->endInterval(O, Name);
 #endif // if !HAVE_ANY_SIGNPOST_IMPL
 }

llvm/lib/Support/Timer.cpp

@@ -174,7 +174,7 @@ void Timer::stopTimer() {
   Running = false;
   Time += TimeRecord::getCurrentTime(false);
   Time -= StartTime;
-  Signposts->endInterval(this);
+  Signposts->endInterval(this, getName());
 }
 
 void Timer::clear() {