[ManagedStatic] Avoid putting function pointers in template args.

This is super awkward, but GCC doesn't let us have template visible when
an argument is an inline function and -fvisibility-inlines-hidden is
used.

llvm-svn: 304175

Author: d0k

llvm/include/llvm/Support/ManagedStatic.h

@@ -20,7 +20,9 @@
 namespace llvm {
 
 /// object_creator - Helper method for ManagedStatic.
-template <class C> void *object_creator() { return new C(); }
+template <class C> struct object_creator {
+  static void *call() { return new C(); }
+};
 
 /// object_deleter - Helper method for ManagedStatic.
 ///
@@ -54,15 +56,15 @@ class ManagedStaticBase {
 /// libraries that link in LLVM components) and for making destruction be
 /// explicit through the llvm_shutdown() function call.
 ///
-template <class C, void *(*Creator)() = object_creator<C>,
-          void (*Deleter)(void *) = object_deleter<C>::call>
+template <class C, class Creator = object_creator<C>,
+          class Deleter = object_deleter<C>>
 class ManagedStatic : public ManagedStaticBase {
 public:
   // Accessors.
   C &operator*() {
     void *Tmp = Ptr.load(std::memory_order_acquire);
     if (!Tmp)
-      RegisterManagedStatic(Creator, Deleter);
+      RegisterManagedStatic(Creator::call, Deleter::call);
 
     return *static_cast<C *>(Ptr.load(std::memory_order_relaxed));
   }
@@ -72,7 +74,7 @@ class ManagedStatic : public ManagedStaticBase {
   const C &operator*() const {
     void *Tmp = Ptr.load(std::memory_order_acquire);
     if (!Tmp)
-      RegisterManagedStatic(Creator, Deleter);
+      RegisterManagedStatic(Creator::call, Deleter::call);
 
     return *static_cast<C *>(Ptr.load(std::memory_order_relaxed));
   }

llvm/lib/Support/Timer.cpp

@@ -73,9 +73,11 @@ std::unique_ptr<raw_fd_ostream> llvm::CreateInfoOutputFile() {
 }
 
 namespace {
-void *CreateDefaultTimerGroup() {
-  return new TimerGroup("misc", "Miscellaneous Ungrouped Timers");
-}
+struct CreateDefaultTimerGroup {
+  static void *call() {
+    return new TimerGroup("misc", "Miscellaneous Ungrouped Timers");
+  }
+};
 } // namespace
 static ManagedStatic<TimerGroup, CreateDefaultTimerGroup> DefaultTimerGroup;
 static TimerGroup *getDefaultTimerGroup() { return &*DefaultTimerGroup; }

llvm/unittests/Support/ManagedStatic.cpp

@@ -82,12 +82,17 @@ TEST(ManagedStaticTest, NestedStatics) {
 } // namespace NestedStatics
 
 namespace CustomCreatorDeletor {
-void *CustomCreate() {
-  void *Mem = std::malloc(sizeof(int));
-  *((int *)Mem) = 42;
-  return Mem;
-}
-static ManagedStatic<int, CustomCreate, std::free> Custom;
+struct CustomCreate {
+  static void *call() {
+    void *Mem = std::malloc(sizeof(int));
+    *((int *)Mem) = 42;
+    return Mem;
+  }
+};
+struct CustomDelete {
+  static void call(void *P) { std::free(P); }
+};
+static ManagedStatic<int, CustomCreate, CustomDelete> Custom;
 TEST(ManagedStaticTest, CustomCreatorDeletor) {
   EXPECT_EQ(42, *Custom);
 }