Captured arguments object materialization

src/runtime.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 8061 matching lines @@
     int prefix_argc,
     int* total_argc) {
   // Find frame containing arguments passed to the caller.
   JavaScriptFrameIterator it(isolate);
   JavaScriptFrame* frame = it.frame();
   List<JSFunction*> functions(2);
   frame->GetFunctions(&functions);
   if (functions.length() > 1) {
     int inlined_jsframe_index = functions.length() - 1;
     JSFunction* inlined_function = functions[inlined_jsframe_index];
-    Vector<SlotRef> args_slots =
-        SlotRef::ComputeSlotMappingForArguments(
-            frame,
-            inlined_jsframe_index,
-            inlined_function->shared()->formal_parameter_count());
+    SlotRefValueBuilder slot_refs(
+        frame,
+        inlined_jsframe_index,
+        inlined_function->shared()->formal_parameter_count());
 
-    int args_count = args_slots.length();
+    int args_count = slot_refs.args_length();
 
     *total_argc = prefix_argc + args_count;
     SmartArrayPointer<Handle<Object> > param_data(
         NewArray<Handle<Object> >(*total_argc));
+    slot_refs.Prepare(isolate);
     for (int i = 0; i < args_count; i++) {
-      Handle<Object> val = args_slots[i].GetValue(isolate);
+      Handle<Object> val = slot_refs.GetNext(isolate, 0);
       param_data[prefix_argc + i] = val;
     }
-
-    args_slots.Dispose();
+    slot_refs.Finish(isolate);
 
     return param_data;
   } else {
     it.AdvanceToArgumentsFrame();
     frame = it.frame();
     int args_count = frame->ComputeParametersCount();
 
     *total_argc = prefix_argc + args_count;
     SmartArrayPointer<Handle<Object> > param_data(
         NewArray<Handle<Object> >(*total_argc));
@@ skipping 6782 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal