1 files changed, 8 insertions, 5 deletions
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index f1014b61831..93b577502da 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -494,10 +494,11 @@ getDefaultBuiltinObjectSizeResult(unsigned Type, llvm::IntegerType *ResType) {
 llvm::Value *
 CodeGenFunction::evaluateOrEmitBuiltinObjectSize(const Expr *E, unsigned Type,
                                                  llvm::IntegerType *ResType,
-                                                 llvm::Value *EmittedE) {
+                                                 llvm::Value *EmittedE,
+                                                 bool IsDynamic) {
   uint64_t ObjectSize;
   if (!E->tryEvaluateObjectSize(ObjectSize, getContext(), Type))
-    return emitBuiltinObjectSize(E, Type, ResType, EmittedE);
+    return emitBuiltinObjectSize(E, Type, ResType, EmittedE, IsDynamic);
   return ConstantInt::get(ResType, ObjectSize, /*isSigned=*/true);
 }
 
@@ -513,7 +514,7 @@ CodeGenFunction::evaluateOrEmitBuiltinObjectSize(const Expr *E, unsigned Type,
 llvm::Value *
 CodeGenFunction::emitBuiltinObjectSize(const Expr *E, unsigned Type,
                                        llvm::IntegerType *ResType,
-                                       llvm::Value *EmittedE) {
+                                       llvm::Value *EmittedE, bool IsDynamic) {
   // We need to reference an argument if the pointer is a parameter with the
   // pass_object_size attribute.
   if (auto *D = dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts())) {
@@ -549,7 +550,7 @@ CodeGenFunction::emitBuiltinObjectSize(const Expr *E, unsigned Type,
   Value *Min = Builder.getInt1((Type & 2) != 0);
   // For GCC compatibility, __builtin_object_size treat NULL as unknown size.
   Value *NullIsUnknown = Builder.getTrue();
-  Value *Dynamic = Builder.getFalse();
+  Value *Dynamic = Builder.getInt1(IsDynamic);
   return Builder.CreateCall(F, {Ptr, Min, NullIsUnknown, Dynamic});
 }
 
@@ -1978,6 +1979,7 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
       Result = Builder.CreateIntCast(Result, ResultType, /*isSigned*/false);
     return RValue::get(Result);
   }
+  case Builtin::BI__builtin_dynamic_object_size:
   case Builtin::BI__builtin_object_size: {
     unsigned Type =
         E->getArg(1)->EvaluateKnownConstInt(getContext()).getZExtValue();
@@ -1985,8 +1987,9 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
 
     // We pass this builtin onto the optimizer so that it can figure out the
     // object size in more complex cases.
+    bool IsDynamic = BuiltinID == Builtin::BI__builtin_dynamic_object_size;
     return RValue::get(emitBuiltinObjectSize(E->getArg(0), Type, ResType,
-                                             /*EmittedE=*/nullptr));
+                                             /*EmittedE=*/nullptr, IsDynamic));
   }
   case Builtin::BI__builtin_prefetch: {
     Value *Locality, *RW, *Address = EmitScalarExpr(E->getArg(0));