Check CallSite arguments more rigorously

src/runtime/runtime-internal.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/ast/prettyprinter.h"
 #include "src/bootstrapper.h"
 #include "src/conversions.h"
 #include "src/debug/debug.h"
 #include "src/frames-inl.h"
 #include "src/isolate-inl.h"
 #include "src/messages.h"
 #include "src/parsing/parser.h"
+#include "src/wasm/wasm-module.h"
 
 namespace v8 {
 namespace internal {
 
 RUNTIME_FUNCTION(Runtime_CheckIsBootstrapping) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 0);
   RUNTIME_ASSERT(isolate->bootstrapper()->IsActive());
   return isolate->heap()->undefined_value();
 }
@@ skipping 562 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_OrdinaryHasInstance) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_HANDLE_CHECKED(Object, callable, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, object, 1);
   RETURN_RESULT_OR_FAILURE(
       isolate, Object::OrdinaryHasInstance(isolate, callable, object));
 }
 
+RUNTIME_FUNCTION(Runtime_IsWasmObject) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(1, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
+  bool is_wasm_object = object->IsJSObject() &&
+                        wasm::IsWasmObject(Handle<JSObject>::cast(object));
+  return *isolate->factory()->ToBoolean(is_wasm_object);
+}
+
 }  // namespace internal
 }  // namespace v8