Merged r20262 into 3.24 branch.

src/hydrogen.cc

 // Copyright 2013 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 9746 matching lines @@
   if (FLAG_allocation_site_pretenuring) {
     pretenure_flag = site_context->current()->GetPretenureMode();
     Handle<AllocationSite> site(site_context->current());
     AllocationSite::AddDependentCompilationInfo(
         site, AllocationSite::TENURING, top_info());
   }
 
   HInstruction* object = Add<HAllocate>(object_size_constant, type,
       pretenure_flag, instance_type, site_context->current());
 
+  // If allocation folding reaches Page::kMaxRegularHeapObjectSize the
+  // elements array may not get folded into the object. Hence, we set the
+  // elements pointer to empty fixed array and let store elimination remove
+  // this store in the folding case.
+  HConstant* empty_fixed_array = Add<HConstant>(
+      isolate()->factory()->empty_fixed_array());
+  Add<HStoreNamedField>(object, HObjectAccess::ForElementsPointer(),
+      empty_fixed_array, INITIALIZING_STORE);
+
   BuildEmitObjectHeader(boilerplate_object, object);
 
   Handle<FixedArrayBase> elements(boilerplate_object->elements());
   int elements_size = (elements->length() > 0 &&
       elements->map() != isolate()->heap()->fixed_cow_array_map()) ?
           elements->Size() : 0;
 
   HInstruction* object_elements = NULL;
   if (elements_size > 0) {
     HValue* object_elements_size = Add<HConstant>(elements_size);
@@ skipping 1474 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal