Basic support for tracking smi-only arrays on ia32.

src/factory.cc

 // Copyright 2011 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 386 matching lines @@
 
 Handle<JSGlobalPropertyCell> Factory::NewJSGlobalPropertyCell(
     Handle<Object> value) {
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->AllocateJSGlobalPropertyCell(*value),
       JSGlobalPropertyCell);
 }
 
 
-Handle<Map> Factory::NewMap(InstanceType type, int instance_size) {
+Handle<Map> Factory::NewMap(InstanceType type,
+                            int instance_size,
+                            ElementsKind elements_kind) {
   CALL_HEAP_FUNCTION(
       isolate(),
-      isolate()->heap()->AllocateMap(type, instance_size),
+      isolate()->heap()->AllocateMap(type, instance_size, elements_kind),
       Map);
 }
 
 
 Handle<JSObject> Factory::NewFunctionPrototype(Handle<JSFunction> function) {
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->AllocateFunctionPrototype(*function),
       JSObject);
 }
@@ skipping 282 matching lines @@
   Handle<JSFunction> function = NewFunction(name, prototype);
 
   // Setup the code pointer in both the shared function info and in
   // the function itself.
   function->shared()->set_code(*code);
   function->set_code(*code);
 
   if (force_initial_map ||
       type != JS_OBJECT_TYPE ||
       instance_size != JSObject::kHeaderSize) {
-    Handle<Map> initial_map = NewMap(type, instance_size);
+    ElementsKind default_elements_kind = FLAG_smi_only_arrays
+        ? FAST_SMI_ONLY_ELEMENTS
+        : FAST_ELEMENTS;
+    Handle<Map> initial_map = NewMap(type,
+                                     instance_size,
+                                     default_elements_kind);
     function->set_initial_map(*initial_map);
     initial_map->set_constructor(*function);
   }
 
   // Set function.prototype and give the prototype a constructor
   // property that refers to the function.
   SetPrototypeProperty(function, prototype);
   // Currently safe because it is only invoked from Genesis.
   SetLocalPropertyNoThrow(prototype, constructor_symbol(), function, DONT_ENUM);
   return function;
@@ skipping 165 matching lines @@
                      Handle<JSArray>::cast(obj)->Initialize(capacity),
                      JSArray);
 }
 
 
 Handle<JSArray> Factory::NewJSArrayWithElements(Handle<FixedArray> elements,
                                                 PretenureFlag pretenure) {
   Handle<JSArray> result =
       Handle<JSArray>::cast(NewJSObject(isolate()->array_function(),
                                         pretenure));
-  result->SetContent(*elements);
+  SetContent(result, elements);
   return result;
 }
 
 
+void Factory::SetContent(Handle<JSArray> array,
+                         Handle<FixedArray> elements) {
+  CALL_HEAP_FUNCTION_VOID(
+      isolate(),
+      array->SetContent(*elements));
+}
+
+
+void Factory::EnsureCanContainNonSmiElements(Handle<JSArray> array) {
+  CALL_HEAP_FUNCTION_VOID(
+      isolate(),
+      array->EnsureCanContainNonSmiElements());
+}
+
+
 Handle<JSProxy> Factory::NewJSProxy(Handle<Object> handler,
                                     Handle<Object> prototype) {
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->AllocateJSProxy(*handler, *prototype),
       JSProxy);
 }
 
 
 void Factory::BecomeJSObject(Handle<JSReceiver> object) {
@@ skipping 373 matching lines @@
     Execution::ConfigureInstance(instance,
                                  instance_template,
                                  pending_exception);
   } else {
     *pending_exception = false;
   }
 }
 
 
 } }  // namespace v8::internal