Remove threshold for inserting lifetime markers for named temporaries

Now that TailRecursionElimination has been fixed with r222354, the
threshold on size for lifetime marker insertion can be removed. This
only affects named temporary though, as the patch for unnamed temporaries
is still in progress.

My previous commit (r222993) was not handling debuginfo correctly, but
this could only be seen with some asan tests. Basically, lifetime markers
are just instrumentation for the compiler's usage and should not affect
debug information; however, the cleanup infrastructure was assuming it
contained only destructors, i.e. actual code to be executed, and was
setting the breakpoint for the end of the function to the closing '}', and
not the return statement, in order to show some destructors have been
called when leaving the function. This is wrong when the cleanups are only
lifetime markers, and this is now fixed.

llvm-svn: 234581

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/EHScopeStack.h b/clang/lib/CodeGen/EHScopeStack.h
index 363d8b8fe4a..a7951888c82 100644
--- a/clang/lib/CodeGen/EHScopeStack.h
+++ b/clang/lib/CodeGen/EHScopeStack.h
@@ -319,6 +319,10 @@ public:
   /// Pops a terminate handler off the stack.
   void popTerminate();
 
+  // Returns true iff the current scope is either empty or contains only
+  // lifetime markers, i.e. no real cleanup code
+  bool containsOnlyLifetimeMarkers(stable_iterator Old) const;
+
   /// Determines whether the exception-scopes stack is empty.
   bool empty() const { return StartOfData == EndOfBuffer; }