Mark calls in thunk functions as tail-call optimization candidates
When a thunk is generated with a call to the original adjusted function,
the thunk appears in the debugger call stack. We want the backend to perform
tail-call optimization on the call, to make it invisible to the debugger.
This fixes PR24235
Patch by: amjad.aboud@intel.com
Differential Revision: http://reviews.llvm.org/D11476
llvm-svn: 244207
diff --git a/clang/lib/CodeGen/CGVTables.cpp b/clang/lib/CodeGen/CGVTables.cpp
index 42cfd36..83f45b5d 100644
--- a/clang/lib/CodeGen/CGVTables.cpp
+++ b/clang/lib/CodeGen/CGVTables.cpp
@@ -312,6 +312,8 @@
// Consider return adjustment if we have ThunkInfo.
if (Thunk && !Thunk->Return.isEmpty())
RV = PerformReturnAdjustment(*this, ResultType, RV, *Thunk);
+ else if (llvm::CallInst* Call = dyn_cast<llvm::CallInst>(CallOrInvoke))
+ Call->setTailCallKind(llvm::CallInst::TCK_Tail);
// Emit return.
if (!ResultType->isVoidType() && Slot.isNull())