Fix whitespace, comments.

[oota-llvm.git] / include / llvm / Support / ManagedStatic.h

diff --git a/include/llvm/Support/ManagedStatic.h b/include/llvm/Support/ManagedStatic.h
index 28b25dbb623b0b9b90b216f50c9af81185a53858..b8e223587fbd34d305704e2d701d7c8840689bf1 100644 (file)
--- a/include/llvm/Support/ManagedStatic.h
+++ b/include/llvm/Support/ManagedStatic.h
@@ -14,15 +14,26 @@
 #ifndef LLVM_SUPPORT_MANAGED_STATIC_H
 #define LLVM_SUPPORT_MANAGED_STATIC_H
 
+#include "llvm/System/Atomic.h"
+#include "llvm/System/Threading.h"
+
 namespace llvm {
 
-/// object_deleter - Helper method for ManagedStatic.
-///
+/// object_creator - Helper method for ManagedStatic.
 template<class C>
-void object_deleter(void *Ptr) {
-  delete (C*)Ptr;
+void* object_creator() {
+  return new C();
 }
 
+/// object_deleter - Helper method for ManagedStatic.
+///
+template<typename T> struct object_deleter {
+  static void call(void * Ptr) { delete (T*)Ptr; }
+};
+template<typename T, size_t N> struct object_deleter<T[N]> {
+  static void call(void * Ptr) { delete[] (T*)Ptr; }
+};
+
 /// ManagedStaticBase - Common base class for ManagedStatic instances.
 class ManagedStaticBase {
 protected:
@@ -31,12 +42,12 @@ protected:
   mutable void *Ptr;
   mutable void (*DeleterFn)(void*);
   mutable const ManagedStaticBase *Next;
-  
-  void RegisterManagedStatic(void *ObjPtr, void (*deleter)(void*)) const;
+
+  void RegisterManagedStatic(void *(*creator)(), void (*deleter)(void*)) const;
 public:
-  /// isConstructed - Return true if this object has not been created yet.  
+  /// isConstructed - Return true if this object has not been created yet.
   bool isConstructed() const { return Ptr != 0; }
-  
+
   void destroy() const;
 };
 
@@ -48,29 +59,36 @@ public:
 template<class C>
 class ManagedStatic : public ManagedStaticBase {
 public:
-  
+
   // Accessors.
   C &operator*() {
-    if (!Ptr) LazyInit();
+    void* tmp = Ptr;
+    if (llvm_is_multithreaded()) sys::MemoryFence();
+    if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>::call);
+
     return *static_cast<C*>(Ptr);
   }
   C *operator->() {
-    if (!Ptr) LazyInit();
+    void* tmp = Ptr;
+    if (llvm_is_multithreaded()) sys::MemoryFence();
+    if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>::call);
+
     return static_cast<C*>(Ptr);
   }
   const C &operator*() const {
-    if (!Ptr) LazyInit();
+    void* tmp = Ptr;
+    if (llvm_is_multithreaded()) sys::MemoryFence();
+    if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>::call);
+
     return *static_cast<C*>(Ptr);
   }
   const C *operator->() const {
-    if (!Ptr) LazyInit();
+    void* tmp = Ptr;
+    if (llvm_is_multithreaded()) sys::MemoryFence();
+    if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>::call);
+
     return static_cast<C*>(Ptr);
   }
-  
-public:
-  void LazyInit() const {
-    RegisterManagedStatic(new C(), object_deleter<C>);
-  }
 };
 
 template<void (*CleanupFn)(void*)>
@@ -79,18 +97,20 @@ public:
   void Register() { RegisterManagedStatic(0, CleanupFn); }
 };
 
-
 /// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
 void llvm_shutdown();
 
-  
+
 /// llvm_shutdown_obj - This is a simple helper class that calls
 /// llvm_shutdown() when it is destroyed.
 struct llvm_shutdown_obj {
-  llvm_shutdown_obj() {}
+  llvm_shutdown_obj() { }
+  explicit llvm_shutdown_obj(bool multithreaded) {
+    if (multithreaded) llvm_start_multithreaded();
+  }
   ~llvm_shutdown_obj() { llvm_shutdown(); }
 };
-  
+
 }
 
 #endif