From e3b557809604d036af6e00c60f012c2025b59a5e Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sat, 11 Feb 2023 13:38:04 +0100
Subject: Vendor import of llvm-project main
 llvmorg-16-init-18548-gb0daacf58f41, the last commit before the upstream
 release/17.x branch was created.

---
 llvm/lib/Support/DebugCounter.cpp | 57 ++++++++++++++++++++-------------------
 1 file changed, 30 insertions(+), 27 deletions(-)

(limited to 'llvm/lib/Support/DebugCounter.cpp')

diff --git a/llvm/lib/Support/DebugCounter.cpp b/llvm/lib/Support/DebugCounter.cpp
index bc2df37e773d..26293bf92a42 100644
--- a/llvm/lib/Support/DebugCounter.cpp
+++ b/llvm/lib/Support/DebugCounter.cpp
@@ -4,7 +4,6 @@
 
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Format.h"
-#include "llvm/Support/ManagedStatic.h"
 
 using namespace llvm;
 
@@ -44,37 +43,41 @@ private:
   }
 };
 
-struct CreateDebugCounterOption {
-  static void *call() {
-    return new DebugCounterList(
-        "debug-counter", cl::Hidden,
-        cl::desc("Comma separated list of debug counter skip and count"),
-        cl::CommaSeparated, cl::location(DebugCounter::instance()));
+// All global objects associated to the DebugCounter, including the DebugCounter
+// itself, are owned by a single global instance of the DebugCounterOwner
+// struct. This makes it easier to control the order in which constructors and
+// destructors are run.
+struct DebugCounterOwner {
+  DebugCounter DC;
+  DebugCounterList DebugCounterOption{
+      "debug-counter", cl::Hidden,
+      cl::desc("Comma separated list of debug counter skip and count"),
+      cl::CommaSeparated, cl::location(DC)};
+  cl::opt<bool> PrintDebugCounter{
+      "print-debug-counter", cl::Hidden, cl::init(false), cl::Optional,
+      cl::desc("Print out debug counter info after all counters accumulated")};
+
+  DebugCounterOwner() {
+    // Our destructor uses the debug stream. By referencing it here, we
+    // ensure that its destructor runs after our destructor.
+    (void)dbgs();
+  }
+
+  // Print information when destroyed, iff command line option is specified.
+  ~DebugCounterOwner() {
+    if (DC.isCountingEnabled() && PrintDebugCounter)
+      DC.print(dbgs());
   }
 };
-} // namespace
-
-static ManagedStatic<DebugCounterList, CreateDebugCounterOption>
-    DebugCounterOption;
-static bool PrintDebugCounter;
-
-void llvm::initDebugCounterOptions() {
-  *DebugCounterOption;
-  static cl::opt<bool, true> RegisterPrintDebugCounter(
-      "print-debug-counter", cl::Hidden, cl::location(PrintDebugCounter),
-      cl::init(false), cl::Optional,
-      cl::desc("Print out debug counter info after all counters accumulated"));
-}
 
-static ManagedStatic<DebugCounter> DC;
+} // anonymous namespace
 
-// Print information when destroyed, iff command line option is specified.
-DebugCounter::~DebugCounter() {
-  if (isCountingEnabled() && PrintDebugCounter)
-    print(dbgs());
-}
+void llvm::initDebugCounterOptions() { (void)DebugCounter::instance(); }
 
-DebugCounter &DebugCounter::instance() { return *DC; }
+DebugCounter &DebugCounter::instance() {
+  static DebugCounterOwner O;
+  return O.DC;
+}
 
 // This is called by the command line parser when it sees a value for the
 // debug-counter option defined above.
-- 
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