Properly set function index in CallSite constructor

src/builtins/builtins-callsite.cc

 // Copyright 2016 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/builtins/builtins.h"
 #include "src/builtins/builtins-utils.h"
 
 #include "src/string-builder.h"
 #include "src/wasm/wasm-module.h"
 
@@ skipping 40 matching lines @@
   const bool is_wasm_object =
       receiver->IsJSObject() && wasm::IsWasmObject(JSObject::cast(*receiver));
   if (!fun->IsJSFunction() && !is_wasm_object) {
     THROW_NEW_ERROR_RETURN_FAILURE(
         isolate, NewTypeError(MessageTemplate::kCallSiteExpectsFunction,
                               Object::TypeOf(isolate, receiver),
                               Object::TypeOf(isolate, fun)));
   }
 
   if (is_wasm_object) {
-    DCHECK(!fun->IsJSFunction());
+    DCHECK(fun->IsSmi());
+    DCHECK(wasm::GetNumberOfFunctions(JSObject::cast(*receiver)) >
+           Smi::cast(*fun)->value());
+
     SET_CALLSITE_PROPERTY(obj, call_site_wasm_obj_symbol, receiver);
-
-    Handle<Object> fun_index;
-    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, fun_index,
-                                       Object::ToUint32(isolate, fun));
     SET_CALLSITE_PROPERTY(obj, call_site_wasm_func_index_symbol, fun);
   } else {
     DCHECK(fun->IsJSFunction());
     SET_CALLSITE_PROPERTY(obj, call_site_receiver_symbol, receiver);
     SET_CALLSITE_PROPERTY(obj, call_site_function_symbol, fun);
   }
 
-  Handle<Object> pos_int32;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, pos_int32,
-                                     Object::ToInt32(isolate, pos));
-  SET_CALLSITE_PROPERTY(obj, call_site_position_symbol, pos_int32);
+  DCHECK(pos->IsSmi());
+  SET_CALLSITE_PROPERTY(obj, call_site_position_symbol, pos);
   SET_CALLSITE_PROPERTY(
       obj, call_site_strict_symbol,
       isolate->factory()->ToBoolean(strict_mode->BooleanValue()));
 
   return *obj;
 }
 
 #undef SET_CALLSITE_PROPERTY
 
 namespace {
@@ skipping 517 matching lines @@
       isolate, AppendFileLocation(isolate, recv, &call_site, &builder));
   builder.AppendCString(")");
 
   RETURN_RESULT_OR_FAILURE(isolate, builder.Finish());
 }
 
 #undef CHECK_CALLSITE
 
 }  // namespace internal
 }  // namespace v8