Make KeyedStores from a sloppy arguments array use a handler.

src/ic/ic-compiler.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/v8.h"
 
 #include "src/cpu-profiler.h"
 #include "src/ic/handler-compiler.h"
 #include "src/ic/ic-inl.h"
 #include "src/ic/ic-compiler.h"
@@ skipping 346 matching lines @@
     bool is_js_array = receiver_map->instance_type() == JS_ARRAY_TYPE;
     ElementsKind elements_kind = receiver_map->elements_kind();
     if (!transitioned_map.is_null()) {
       cached_stub =
           ElementsTransitionAndStoreStub(isolate(), elements_kind,
                                          transitioned_map->elements_kind(),
                                          is_js_array, store_mode).GetCode();
     } else if (receiver_map->instance_type() < FIRST_JS_RECEIVER_TYPE) {
       cached_stub = isolate()->builtins()->KeyedStoreIC_Slow();
     } else {
-      if (receiver_map->has_fast_elements() ||
-          receiver_map->has_external_array_elements() ||
-          receiver_map->has_fixed_typed_array_elements()) {
+      if (IsSloppyArgumentsElements(elements_kind)) {
+        cached_stub = KeyedStoreSloppyArgumentsStub(isolate()).GetCode();
+      } else if (receiver_map->has_fast_elements() ||
+                 receiver_map->has_external_array_elements() ||
+                 receiver_map->has_fixed_typed_array_elements()) {
         cached_stub = StoreFastElementStub(isolate(), is_js_array,
                                            elements_kind, store_mode).GetCode();
       } else {
         cached_stub = StoreElementStub(isolate(), elements_kind).GetCode();
       }
     }
     DCHECK(!cached_stub.is_null());
     handlers.Add(cached_stub);
     transitioned_maps.Add(transitioned_map);
   }
 
   Handle<Code> code = CompileKeyedStorePolymorphic(receiver_maps, &handlers,
                                                    &transitioned_maps);
   isolate()->counters()->keyed_store_polymorphic_stubs()->Increment();
   PROFILE(isolate(), CodeCreateEvent(log_kind(code), *code, 0));
   return code;
 }
 
 
 #define __ ACCESS_MASM(masm())
 
 
 Handle<Code> PropertyICCompiler::CompileKeyedStoreMonomorphic(
     Handle<Map> receiver_map, KeyedAccessStoreMode store_mode) {
   ElementsKind elements_kind = receiver_map->elements_kind();
   bool is_jsarray = receiver_map->instance_type() == JS_ARRAY_TYPE;
   Handle<Code> stub;
-  if (receiver_map->has_fast_elements() ||
-      receiver_map->has_external_array_elements() ||
-      receiver_map->has_fixed_typed_array_elements()) {
+  if (receiver_map->has_sloppy_arguments_elements()) {
+    stub = KeyedStoreSloppyArgumentsStub(isolate()).GetCode();
+  } else if (receiver_map->has_fast_elements() ||
+             receiver_map->has_external_array_elements() ||
+             receiver_map->has_fixed_typed_array_elements()) {
     stub = StoreFastElementStub(isolate(), is_jsarray, elements_kind,
                                 store_mode).GetCode();
   } else {
     stub = StoreElementStub(isolate(), elements_kind).GetCode();
   }
 
   Handle<WeakCell> cell = Map::WeakCellForMap(receiver_map);
 
   __ DispatchWeakMap(receiver(), scratch1(), scratch2(), cell, stub,
                      DO_SMI_CHECK);
 
   TailCallBuiltin(masm(), Builtins::kKeyedStoreIC_Miss);
 
   return GetCode(kind(), Code::NORMAL, factory()->empty_string());
 }
 
 
 #undef __
 }
 }  // namespace v8::internal