Emit lifetime.start / lifetime.end markers for unnamed temporary objects.

This will give more information to the optimizers so that they can reuse stack slots
and reduce stack usage.

llvm-svn: 218865

1 files changed, 13 insertions, 7 deletions

diff --git a/clang/lib/CodeGen/CGCleanup.cpp b/clang/lib/CodeGen/CGCleanup.cpp
index ed9f96df798..911734ae8e8 100644
--- a/clang/lib/CodeGen/CGCleanup.cpp
+++ b/clang/lib/CodeGen/CGCleanup.cpp
@@ -387,14 +387,9 @@ void CodeGenFunction::PopCleanupBlocks(EHScopeStack::stable_iterator Old) {
   }
 }
 
-/// Pops cleanup blocks until the given savepoint is reached, then add the
-/// cleanups from the given savepoint in the lifetime-extended cleanups stack.
+/// Move our deferred cleanups onto the EH stack.
 void
-CodeGenFunction::PopCleanupBlocks(EHScopeStack::stable_iterator Old,
-                                  size_t OldLifetimeExtendedSize) {
-  PopCleanupBlocks(Old);
-
-  // Move our deferred cleanups onto the EH stack.
+CodeGenFunction::MoveDeferedCleanups(size_t OldLifetimeExtendedSize) {
   for (size_t I = OldLifetimeExtendedSize,
               E = LifetimeExtendedCleanupStack.size(); I != E; /**/) {
     // Alignment should be guaranteed by the vptrs in the individual cleanups.
@@ -414,6 +409,17 @@ CodeGenFunction::PopCleanupBlocks(EHScopeStack::stable_iterator Old,
   LifetimeExtendedCleanupStack.resize(OldLifetimeExtendedSize);
 }
 
+/// Pops cleanup blocks until the given savepoint is reached, then add the
+/// cleanups from the given savepoint in the lifetime-extended cleanups stack.
+void
+CodeGenFunction::PopCleanupBlocks(EHScopeStack::stable_iterator Old,
+                                  size_t OldLifetimeExtendedSize) {
+  PopCleanupBlocks(Old);
+
+  // Move our deferred cleanups onto the EH stack.
+  MoveDeferedCleanups(OldLifetimeExtendedSize);
+}
+
 static llvm::BasicBlock *CreateNormalEntry(CodeGenFunction &CGF,
                                            EHCleanupScope &Scope) {
   assert(Scope.isNormalCleanup());