In the toplevel code generator, suppor local context allocation...

src/compiler.cc

 // Copyright 2009 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 567 matching lines @@
   fun->shared()->SetThisPropertyAssignmentsInfo(
       lit->has_only_this_property_assignments(),
       lit->has_only_simple_this_property_assignments(),
       *lit->this_property_assignments());
   fun->shared()->set_try_fast_codegen(lit->try_fast_codegen());
 }
 
 
 CodeGenSelector::CodeGenTag CodeGenSelector::Select(FunctionLiteral* fun) {
   Scope* scope = fun->scope();
+
+  if (scope->num_heap_slots() > 0) {
+    // We support functions with a local context if they do not have
+    // parameters that need to be copied into the context.
+    for (int i = 0, len = scope->num_parameters(); i < len; i++) {
+      Slot* slot = scope->parameter(i)->slot();
+      if (slot != NULL && slot->type() == Slot::CONTEXT) {
+        if (FLAG_trace_bailout) {
+          PrintF("function has context-allocated parameters");
+        }
+        return NORMAL;
+      }
+    }
+  }
+
   if (scope->num_heap_slots() != 0) {
     if (FLAG_trace_bailout) PrintF("function has context slots\n");
     return NORMAL;
   }
   if (scope->arguments() != NULL) {
     if (FLAG_trace_bailout) PrintF("function uses 'arguments'\n");
     return NORMAL;
   }
 
   has_supported_syntax_ = true;
@@ skipping 487 matching lines @@
 
 void CodeGenSelector::VisitThisFunction(ThisFunction* expr) {
   BAILOUT("ThisFunction");
 }
 
 #undef BAILOUT
 #undef CHECK_BAILOUT
 
 
 } }  // namespace v8::internal