arrange to create prototypes for generators

src/arm/code-stubs-arm.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 163 matching lines @@
   Label gc;
 
   // Pop the function info from the stack.
   __ pop(r3);
 
   // Attempt to allocate new JSFunction in new space.
   __ Allocate(JSFunction::kSize, r0, r1, r2, &gc, TAG_OBJECT);
 
   __ IncrementCounter(counters->fast_new_closure_total(), 1, r6, r7);
 
-  int map_index = (language_mode_ == CLASSIC_MODE)
-      ? Context::FUNCTION_MAP_INDEX
-      : Context::STRICT_MODE_FUNCTION_MAP_INDEX;
+  int map_index = is_generator_

[rossberg, 2013/04/11 13:05:20]

Nit: it would be nice if this could be moved into some abstraction, since the
same logic is repeated at least 4 times (3 back-ends, and MapForNewFunction in
factory.cc).

[wingo, 2013/04/11 14:38:45]

Done.

+      ? ((language_mode_ == CLASSIC_MODE)
+         ? Context::GENERATOR_FUNCTION_MAP_INDEX
+         : Context::STRICT_MODE_GENERATOR_FUNCTION_MAP_INDEX)
+      : ((language_mode_ == CLASSIC_MODE)
+         ? Context::FUNCTION_MAP_INDEX
+         : Context::STRICT_MODE_FUNCTION_MAP_INDEX);
 
   // Compute the function map in the current native context and set that
   // as the map of the allocated object.
   __ ldr(r2, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
   __ ldr(r2, FieldMemOperand(r2, GlobalObject::kNativeContextOffset));
   __ ldr(r5, MemOperand(r2, Context::SlotOffset(map_index)));
   __ str(r5, 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.
@@ skipping 7832 matching lines @@
 
   __ Pop(lr, r5, r1);
   __ Ret();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM