Resolve undefined behaviour when ManagedStatic is instantiated with a fixed-length array type.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75149 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 8 deletions

diff --git a/include/llvm/Support/ManagedStatic.h b/include/llvm/Support/ManagedStatic.h
index 4fc648319a..b8e223587f 100644
--- a/include/llvm/Support/ManagedStatic.h
+++ b/include/llvm/Support/ManagedStatic.h
@@ -27,10 +27,12 @@ void* object_creator() {
 
 /// object_deleter - Helper method for ManagedStatic.
 ///
-template<class C>
-void object_deleter(void *Ptr) {
-  delete (C*)Ptr;
-}
+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 {
@@ -62,28 +64,28 @@ public:
   C &operator*() {
     void* tmp = Ptr;
     if (llvm_is_multithreaded()) sys::MemoryFence();
-    if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
+    if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>::call);
 
     return *static_cast<C*>(Ptr);
   }
   C *operator->() {
     void* tmp = Ptr;
     if (llvm_is_multithreaded()) sys::MemoryFence();
-    if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
+    if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>::call);
 
     return static_cast<C*>(Ptr);
   }
   const C &operator*() const {
     void* tmp = Ptr;
     if (llvm_is_multithreaded()) sys::MemoryFence();
-    if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
+    if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>::call);
 
     return *static_cast<C*>(Ptr);
   }
   const C *operator->() const {
     void* tmp = Ptr;
     if (llvm_is_multithreaded()) sys::MemoryFence();
-    if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
+    if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>::call);
 
     return static_cast<C*>(Ptr);
   }