[CodeGen] Don't write into a SmallVector's uninitialized memory.

That's just ugly and not needed in this case. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@243973 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 7 deletions

diff --git a/lib/CodeGen/CGCleanup.cpp b/lib/CodeGen/CGCleanup.cpp
index ef5a98ead9..5666a689af 100644
--- a/lib/CodeGen/CGCleanup.cpp
+++ b/lib/CodeGen/CGCleanup.cpp
@@ -685,13 +685,10 @@ void CodeGenFunction::PopCleanupBlock(bool FallthroughIsBranchThrough) {
   // Copy the cleanup emission data out.  Note that SmallVector
   // guarantees maximal alignment for its buffer regardless of its
   // type parameter.
-  SmallVector<char, 8*sizeof(void*)> CleanupBuffer;
-  CleanupBuffer.reserve(Scope.getCleanupSize());
-  memcpy(CleanupBuffer.data(),
-         Scope.getCleanupBuffer(), Scope.getCleanupSize());
-  CleanupBuffer.set_size(Scope.getCleanupSize());
-  EHScopeStack::Cleanup *Fn =
-    reinterpret_cast<EHScopeStack::Cleanup*>(CleanupBuffer.data());
+  auto *CleanupSource = reinterpret_cast<char *>(Scope.getCleanupBuffer());
+  SmallVector<char, 8 * sizeof(void *)> CleanupBuffer(
+      CleanupSource, CleanupSource + Scope.getCleanupSize());
+  auto *Fn = reinterpret_cast<EHScopeStack::Cleanup *>(CleanupBuffer.data());
 
   EHScopeStack::Cleanup::Flags cleanupFlags;
   if (Scope.isNormalCleanup())