Fast path for strict closure creation.

src/arm/code-stubs-arm.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 73 matching lines @@
   __ pop(r3);
 
   // Attempt to allocate new JSFunction in new space.
   __ AllocateInNewSpace(JSFunction::kSize,
                         r0,
                         r1,
                         r2,
                         &gc,
                         TAG_OBJECT);
 
+  int map_index = strict_mode_ == kStrictMode
+      ? Context::FUNCTION_MAP_STRICT_INDEX
+      : Context::FUNCTION_MAP_INDEX;
+
   // Compute the function map in the current global context and set that
   // as the map of the allocated object.
   __ ldr(r2, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
   __ ldr(r2, FieldMemOperand(r2, GlobalObject::kGlobalContextOffset));
-  __ ldr(r2, MemOperand(r2, Context::SlotOffset(Context::FUNCTION_MAP_INDEX)));
+  __ ldr(r2, MemOperand(r2, Context::SlotOffset(map_index)));
   __ str(r2, FieldMemOperand(r0, HeapObject::kMapOffset));
 
   // Initialize the rest of the function. We don't have to update the
   // write barrier because the allocated object is in new space.
   __ LoadRoot(r1, Heap::kEmptyFixedArrayRootIndex);
   __ LoadRoot(r2, Heap::kTheHoleValueRootIndex);
   __ LoadRoot(r4, Heap::kUndefinedValueRootIndex);
   __ str(r1, FieldMemOperand(r0, JSObject::kPropertiesOffset));
   __ str(r1, FieldMemOperand(r0, JSObject::kElementsOffset));
   __ str(r2, FieldMemOperand(r0, JSFunction::kPrototypeOrInitialMapOffset));
@@ skipping 6739 matching lines @@
   __ str(pc, MemOperand(sp, 0));
   __ Jump(target);  // Call the C++ function.
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM