Make closures optimizable by Crankshaft compiler.

src/runtime.cc

 // Copyright 2010 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 1731 matching lines @@
     target->ReplaceCode(shared->code());
     target->shared()->set_scope_info(shared->scope_info());
     target->shared()->set_length(shared->length());
     target->shared()->set_formal_parameter_count(
         shared->formal_parameter_count());
     // Set the source code of the target function to undefined.
     // SetCode is only used for built-in constructors like String,
     // Array, and Object, and some web code
     // doesn't like seeing source code for constructors.
     target->shared()->set_script(Heap::undefined_value());
+    target->shared()->code()->set_optimizable(false);
     // Clear the optimization hints related to the compiled code as these are no
     // longer valid when the code is overwritten.
     target->shared()->ClearThisPropertyAssignmentsInfo();
     context = Handle<Context>(fun->context());
 
     // Make sure we get a fresh copy of the literal vector to avoid
     // cross context contamination.
     int number_of_literals = fun->NumberOfLiterals();
     Handle<FixedArray> literals =
         Factory::NewFixedArray(number_of_literals, TENURED);
@@ skipping 4945 matching lines @@
 
 
 static MaybeObject* Runtime_LazyRecompile(Arguments args) {
   HandleScope scope;
   ASSERT(args.length() == 1);
   Handle<JSFunction> function = args.at<JSFunction>(0);
   // If the function is not optimizable or debugger is active continue using the
   // code from the full compiler.
   if (!function->shared()->code()->optimizable() ||
       Debug::has_break_points()) {
+    if (FLAG_trace_opt) {
+      PrintF("[failed to optimize ");
+      function->PrintName();
+      PrintF(": is code optimizable: %s, is debugger enabled: %s]\n",
+          function->shared()->code()->optimizable() ? "T" : "F",
+          Debug::has_break_points() ? "T" : "F");
+    }
     function->ReplaceCode(function->shared()->code());
     return function->code();
   }
   if (CompileOptimized(function, AstNode::kNoNumber)) {
     return function->code();
   }
+  if (FLAG_trace_opt) {
+    PrintF("[failed to optimize ");
+    function->PrintName();
+    PrintF(": optimized compilation failed]\n");
+  }
   function->ReplaceCode(function->shared()->code());
   return Failure::Exception();
 }
 
 
 static MaybeObject* Runtime_NotifyDeoptimized(Arguments args) {
   HandleScope scope;
   ASSERT(args.length() == 1);
   RUNTIME_ASSERT(args[0]->IsSmi());
   Deoptimizer::BailoutType type =
@@ skipping 4096 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal