Eagerly format traces in captureStackTrace

src/messages.cc

 // Copyright 2011 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/messages.h"
 
 #include "src/api.h"
 #include "src/bootstrapper.h"
 #include "src/execution.h"
 #include "src/isolate-inl.h"
@@ skipping 346 matching lines @@
   // receiver.
   Object* ctor_symbol = isolate_->heap()->call_site_constructor_symbol();
   if (*receiver_ == ctor_symbol) return true;
   if (!IsJavaScript() || !receiver_->IsJSObject()) return false;
   Handle<Object> constructor =
       JSReceiver::GetDataProperty(Handle<JSObject>::cast(receiver_),
                                   isolate_->factory()->constructor_string());
   return constructor.is_identical_to(fun_);
 }
 
+MaybeHandle<Object> FormatStackTrace(Isolate* isolate, Handle<JSObject> error,
+                                     Handle<Object> stack_trace) {
+  // TODO(jgruber): Port FormatStackTrace from JS.
+  Handle<JSFunction> fun = isolate->error_format_stack_trace();
+
+  int argc = 2;
+  ScopedVector<Handle<Object>> argv(argc);
+  argv[0] = error;
+  argv[1] = stack_trace;
+
+  Handle<Object> formatted_stack_trace;
+  ASSIGN_RETURN_ON_EXCEPTION(
+      isolate, formatted_stack_trace,
+      Execution::Call(isolate, fun, error, argc, argv.start()), Object);
+
+  return formatted_stack_trace;
+}
 
 Handle<String> MessageTemplate::FormatMessage(Isolate* isolate,
                                               int template_index,
                                               Handle<Object> arg) {
   Factory* factory = isolate->factory();
   Handle<String> result_string;
   if (arg->IsString()) {
     result_string = Handle<String>::cast(arg);
   } else {
     Handle<JSFunction> fun = isolate->no_side_effects_to_string_fun();
@@ skipping 111 matching lines @@
   // Capture a simple stack trace for the stack property.
   RETURN_ON_EXCEPTION(isolate, isolate->CaptureAndSetSimpleStackTrace(
                                    err, mode, Handle<Object>()),
                       Object);
 
   return err;
 }
 
 }  // namespace internal
 }  // namespace v8