Revert "Use global TimerGroups for both new pass manager and old pass manager timers" (#131173)

Reverts #130375

Causes breakages, e.g.
https://lab.llvm.org/buildbot/#/builders/160/builds/14607

Author: aeubanks

clang/test/Misc/time-passes.c

@@ -19,5 +19,6 @@
 // NPM:       InstCombinePass{{$}}
 // NPM-NOT:   InstCombinePass #
 // TIME: Total{{$}}
+// NPM: Pass execution timing report
 
 int foo(int x, int y) { return x + y; }

llvm/include/llvm/IR/PassTimingInfo.h

@@ -39,18 +39,17 @@ Timer *getPassTimer(Pass *);
 /// This class implements -time-passes functionality for new pass manager.
 /// It provides the pass-instrumentation callbacks that measure the pass
 /// execution time. They collect timing info into individual timers as
-/// passes are being run.
+/// passes are being run. At the end of its life-time it prints the resulting
+/// timing report.
 class TimePassesHandler {
   /// Value of this type is capable of uniquely identifying pass invocations.
   /// It is a pair of string Pass-Identifier (which for now is common
   /// to all the instance of a given pass) + sequential invocation counter.
   using PassInvocationID = std::pair<StringRef, unsigned>;
 
   /// Groups of timers for passes and analyses.
-  TimerGroup &PassTG =
-      NamedRegionTimer::getNamedTimerGroup(PassGroupName, PassGroupDesc);
-  TimerGroup &AnalysisTG = NamedRegionTimer::getNamedTimerGroup(
-      AnalysisGroupName, AnalysisGroupDesc);
+  TimerGroup PassTG;
+  TimerGroup AnalysisTG;
 
   using TimerVector = llvm::SmallVector<std::unique_ptr<Timer>, 4>;
   /// Map of timers for pass invocations
@@ -72,15 +71,12 @@ class TimePassesHandler {
   bool PerRun;
 
 public:
-  static constexpr StringRef PassGroupName = "pass";
-  static constexpr StringRef AnalysisGroupName = "analysis";
-  static constexpr StringRef PassGroupDesc = "Pass execution timing report";
-  static constexpr StringRef AnalysisGroupDesc =
-      "Analysis execution timing report";
-
   TimePassesHandler();
   TimePassesHandler(bool Enabled, bool PerRun = false);
 
+  /// Destructor handles the print action if it has not been handled before.
+  ~TimePassesHandler() { print(); }
+
   /// Prints out timing information and then resets the timers.
   void print();
 

llvm/include/llvm/Support/Timer.h

@@ -169,11 +169,6 @@ struct NamedRegionTimer : public TimeRegion {
   explicit NamedRegionTimer(StringRef Name, StringRef Description,
                             StringRef GroupName,
                             StringRef GroupDescription, bool Enabled = true);
-
-  // Create or get a TimerGroup stored in the same global map owned by
-  // NamedRegionTimer.
-  static TimerGroup &getNamedTimerGroup(StringRef GroupName,
-                                        StringRef GroupDescription);
 };
 
 /// The TimerGroup class is used to group together related timers into a single

llvm/lib/IR/PassTimingInfo.cpp

@@ -63,9 +63,16 @@ class PassTimingInfo {
 private:
   StringMap<unsigned> PassIDCountMap; ///< Map that counts instances of passes
   DenseMap<PassInstanceID, std::unique_ptr<Timer>> TimingData; ///< timers for pass instances
-  TimerGroup *PassTG = nullptr;
+  TimerGroup TG;
 
 public:
+  /// Default constructor for yet-inactive timeinfo.
+  /// Use \p init() to activate it.
+  PassTimingInfo();
+
+  /// Print out timing information and release timers.
+  ~PassTimingInfo();
+
   /// Initializes the static \p TheTimeInfo member to a non-null value when
   /// -time-passes is enabled. Leaves it null otherwise.
   ///
@@ -87,6 +94,14 @@ class PassTimingInfo {
 
 static ManagedStatic<sys::SmartMutex<true>> TimingInfoMutex;
 
+PassTimingInfo::PassTimingInfo() : TG("pass", "Pass execution timing report") {}
+
+PassTimingInfo::~PassTimingInfo() {
+  // Deleting the timers accumulates their info into the TG member.
+  // Then TG member is (implicitly) deleted, actually printing the report.
+  TimingData.clear();
+}
+
 void PassTimingInfo::init() {
   if (TheTimeInfo || !TimePassesIsEnabled)
     return;
@@ -95,16 +110,12 @@ void PassTimingInfo::init() {
   // This guarantees that the object will be constructed after static globals,
   // thus it will be destroyed before them.
   static ManagedStatic<PassTimingInfo> TTI;
-  if (!TTI->PassTG)
-    TTI->PassTG = &NamedRegionTimer::getNamedTimerGroup(
-        TimePassesHandler::PassGroupName, TimePassesHandler::PassGroupDesc);
   TheTimeInfo = &*TTI;
 }
 
 /// Prints out timing information and then resets the timers.
 void PassTimingInfo::print(raw_ostream *OutStream) {
-  assert(PassTG && "PassTG is null, did you call PassTimingInfo::Init()?");
-  PassTG->print(OutStream ? *OutStream : *CreateInfoOutputFile(), true);
+  TG.print(OutStream ? *OutStream : *CreateInfoOutputFile(), true);
 }
 
 Timer *PassTimingInfo::newPassTimer(StringRef PassID, StringRef PassDesc) {
@@ -113,8 +124,7 @@ Timer *PassTimingInfo::newPassTimer(StringRef PassID, StringRef PassDesc) {
   // Appending description with a pass-instance number for all but the first one
   std::string PassDescNumbered =
       num <= 1 ? PassDesc.str() : formatv("{0} #{1}", PassDesc, num).str();
-  assert(PassTG && "PassTG is null, did you call PassTimingInfo::Init()?");
-  return new Timer(PassID, PassDescNumbered, *PassTG);
+  return new Timer(PassID, PassDescNumbered, TG);
 }
 
 Timer *PassTimingInfo::getPassTimer(Pass *P, PassInstanceID Pass) {
@@ -183,7 +193,9 @@ Timer &TimePassesHandler::getPassTimer(StringRef PassID, bool IsPass) {
 }
 
 TimePassesHandler::TimePassesHandler(bool Enabled, bool PerRun)
-    : Enabled(Enabled), PerRun(PerRun) {}
+    : PassTG("pass", "Pass execution timing report"),
+      AnalysisTG("analysis", "Analysis execution timing report"),
+      Enabled(Enabled), PerRun(PerRun) {}
 
 TimePassesHandler::TimePassesHandler()
     : TimePassesHandler(TimePassesIsEnabled, TimePassesPerRun) {}

llvm/lib/Support/Timer.cpp

@@ -222,26 +222,15 @@ class Name2PairMap {
              StringRef GroupDescription) {
     sys::SmartScopedLock<true> L(timerLock());
 
-    std::pair<TimerGroup *, Name2TimerMap> &GroupEntry =
-        getGroupEntry(GroupName, GroupDescription);
-    Timer &T = GroupEntry.second[Name];
-    if (!T.isInitialized())
-      T.init(Name, Description, *GroupEntry.first);
-    return T;
-  }
-
-  TimerGroup &getTimerGroup(StringRef GroupName, StringRef GroupDescription) {
-    return *getGroupEntry(GroupName, GroupDescription).first;
-  }
+    std::pair<TimerGroup*, Name2TimerMap> &GroupEntry = Map[GroupName];
 
-private:
-  std::pair<TimerGroup *, Name2TimerMap> &
-  getGroupEntry(StringRef GroupName, StringRef GroupDescription) {
-    std::pair<TimerGroup *, Name2TimerMap> &GroupEntry = Map[GroupName];
     if (!GroupEntry.first)
       GroupEntry.first = new TimerGroup(GroupName, GroupDescription);
 
-    return GroupEntry;
+    Timer &T = GroupEntry.second[Name];
+    if (!T.isInitialized())
+      T.init(Name, Description, *GroupEntry.first);
+    return T;
   }
 };
 
@@ -255,11 +244,6 @@ NamedRegionTimer::NamedRegionTimer(StringRef Name, StringRef Description,
                      : &namedGroupedTimers().get(Name, Description, GroupName,
                                                  GroupDescription)) {}
 
-TimerGroup &NamedRegionTimer::getNamedTimerGroup(StringRef GroupName,
-                                                 StringRef GroupDescription) {
-  return namedGroupedTimers().getTimerGroup(GroupName, GroupDescription);
-}
-
 //===----------------------------------------------------------------------===//
 //   TimerGroup Implementation
 //===----------------------------------------------------------------------===//

llvm/unittests/IR/TimePassesTest.cpp

@@ -161,8 +161,8 @@ TEST(TimePassesTest, CustomOut) {
   PI.runBeforePass(Pass2, M);
   PI.runAfterPass(Pass2, M, PreservedAnalyses::all());
 
-  // Clear and generate report again.
-  TimePasses->print();
+  // Generate report by deleting the handler.
+  TimePasses.reset();
 
   // There should be Pass2 in this report and no Pass1.
   EXPECT_FALSE(TimePassesStr.str().empty());