[turbofan] Initial support for constructor call inlining.

src/runtime/runtime-function.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/accessors.h"
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/deoptimizer.h"
@@ skipping 552 matching lines @@
       isolate, result, Execution::Call(isolate, fun, receiver, argc, argv));
   return *result;
 }
 
 
 RUNTIME_FUNCTION(Runtime_GetOriginalConstructor) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 0);
   JavaScriptFrameIterator it(isolate);
   JavaScriptFrame* frame = it.frame();
-  // Currently we don't inline [[Construct]] calls.
-  return frame->IsConstructor() && !frame->HasInlinedFrames()
-             ? frame->GetOriginalConstructor()
-             : isolate->heap()->undefined_value();
+  // TODO(4544): Currently we never inline any [[Construct]] calls where the
+  // actual constructor differs from the original constructor. Fix this soon!
+  if (frame->HasInlinedFrames()) {
+    HandleScope scope(isolate);
+    List<FrameSummary> frames(FLAG_max_inlining_levels + 1);
+    it.frame()->Summarize(&frames);
+    FrameSummary& summary = frames.last();
+    return summary.is_constructor() ? Object::cast(*summary.function())
+                                    : isolate->heap()->undefined_value();
+  }
+  return frame->IsConstructor() ? frame->GetOriginalConstructor()
+                                : isolate->heap()->undefined_value();
 }
 
 
 // ES6 section 9.2.1.2, OrdinaryCallBindThis for sloppy callee.
 RUNTIME_FUNCTION(Runtime_ConvertReceiver) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 0);
   if (receiver->IsNull() || receiver->IsUndefined()) {
     return isolate->global_proxy();
   }
   return *Object::ToObject(isolate, receiver).ToHandleChecked();
 }
 
 
 RUNTIME_FUNCTION(Runtime_IsConstructCall) {
-  SealHandleScope shs(isolate);
+  HandleScope scope(isolate);
   DCHECK(args.length() == 0);
   JavaScriptFrameIterator it(isolate);
-  JavaScriptFrame* frame = it.frame();
-  return isolate->heap()->ToBoolean(frame->IsConstructor());
+  List<FrameSummary> frames(FLAG_max_inlining_levels + 1);
+  it.frame()->Summarize(&frames);
+  FrameSummary& summary = frames.last();
+  return isolate->heap()->ToBoolean(summary.is_constructor());
 }
 
 
 RUNTIME_FUNCTION(Runtime_IsFunction) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(Object, obj, 0);
   return isolate->heap()->ToBoolean(obj->IsJSFunction());
 }
 
 
 RUNTIME_FUNCTION(Runtime_ThrowStrongModeTooFewArguments) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 0);
   THROW_NEW_ERROR_RETURN_FAILURE(isolate,
                                  NewTypeError(MessageTemplate::kStrongArity));
 }
 
 }  // namespace internal
 }  // namespace v8