1 files changed, 4 insertions, 1 deletions
diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index 9f35918..354939a 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -36,7 +36,7 @@ using namespace CodeGen;
 CodeGenFunction::CodeGenFunction(CodeGenModule &cgm, bool suppressNewContext)
     : CodeGenTypeCache(cgm), CGM(cgm), Target(cgm.getTarget()),
       Builder(cgm.getModule().getContext(), llvm::ConstantFolder(),
-              CGBuilderInserterTy(this)),
+              CGBuilderInserterTy(this)), CurFn(nullptr),
       CapturedStmtInfo(nullptr), SanOpts(&CGM.getLangOpts().Sanitize),
       IsSanitizerScope(false), CurFuncIsThunk(false), AutoreleaseResult(false),
       SawAsmBlock(false), BlockInfo(nullptr), BlockPointer(nullptr),
@@ -565,6 +565,9 @@ void CodeGenFunction::StartFunction(GlobalDecl GD,
                                     const FunctionArgList &Args,
                                     SourceLocation Loc,
                                     SourceLocation StartLoc) {
+  assert(!CurFn &&
+         "Do not use a CodeGenFunction object for more than one function");
+
   const Decl *D = GD.getDecl();
 
   DidCallStackSave = false;