Use a Factory Method for MachineFunctionInfo Creation

The goal is to allows MachineFunctionInfo to override this create
function to customize the creation.
No change intended in existing backend in this patch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225292 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/CodeGen/MachineFunction.h b/include/llvm/CodeGen/MachineFunction.h
index 3271410d71bae8d223f46c8def3de6ec68c255b9..4e9ff9ebb4fead3136df917bc799b1f8eeb6325d 100644 (file)
--- a/include/llvm/CodeGen/MachineFunction.h
+++ b/include/llvm/CodeGen/MachineFunction.h
@@ -72,6 +72,15 @@ private:
 /// MachineFunction is destroyed.
 struct MachineFunctionInfo {
   virtual ~MachineFunctionInfo();
+
+  /// \brief Factory function: default behavior is to call new using the
+  /// supplied allocator.
+  ///
+  /// This function can be overridden in a derive class.
+  template<typename Ty>
+  static Ty *create(BumpPtrAllocator &Allocator, MachineFunction &MF) {
+    return new (Allocator.Allocate<Ty>()) Ty(MF);
+  }
 };
 
 class MachineFunction {
@@ -239,7 +248,7 @@ public:
   template<typename Ty>
   Ty *getInfo() {
     if (!MFInfo)
-      MFInfo = new (Allocator.Allocate<Ty>()) Ty(*this);
+      MFInfo = Ty::template create<Ty>(Allocator, *this);
     return static_cast<Ty*>(MFInfo);
   }