Reuse data fragments while lowering. Patch by David Meyer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119999 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 2 deletions

diff --git a/include/llvm/MC/MCAsmLayout.h b/include/llvm/MC/MCAsmLayout.h
index b9565ba..6feacf5 100644
--- a/include/llvm/MC/MCAsmLayout.h
+++ b/include/llvm/MC/MCAsmLayout.h
@@ -59,8 +59,15 @@ public:
   /// the delta from the old size.
   void UpdateForSlide(MCFragment *F, int SlideAmount);
 
-  /// \brief Update the layout because a fragment has been replaced.
-  void FragmentReplaced(MCFragment *Src, MCFragment *Dst);
+  /// \brief Update the layout, replacing Src with Dst. The contents
+  /// of Src and Dst are not modified, and must be copied by the caller.
+  /// Src will be removed from the layout, but not deleted.
+  void ReplaceFragment(MCFragment *Src, MCFragment *Dst);
+
+  /// \brief Update the layout to coalesce Src into Dst. The contents
+  /// of Src and Dst are not modified, and must be coalesced by the caller.
+  /// Src will be removed from the layout, but not deleted.
+  void CoalesceFragments(MCFragment *Src, MCFragment *Dst);
 
   /// \brief Perform a full layout.
   void LayoutFile();