[turbofan] First shot at eager deoptimization in Turbofan.

src/runtime/runtime-test.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/arguments.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen.h"
 #include "src/natives.h"
@@ skipping 12 matching lines @@
   if (function->code()->is_turbofanned() && !FLAG_turbo_deoptimization) {
     return isolate->heap()->undefined_value();
   }
 
   Deoptimizer::DeoptimizeFunction(*function);
 
   return isolate->heap()->undefined_value();
 }
 
 
+RUNTIME_FUNCTION(Runtime_DeoptimizeNow) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 0);
+
+  Handle<JSFunction> function;
+
+  // If the argument is 'undefined', deoptimize the topmost
+  // function.
+  JavaScriptFrameIterator it(isolate);
+  while (!it.done()) {
+    if (it.frame()->is_java_script()) {
+      function = Handle<JSFunction>(it.frame()->function());
+      break;
+    }
+  }
+  if (function.is_null()) return isolate->heap()->undefined_value();
+
+  if (!function->IsOptimized()) return isolate->heap()->undefined_value();
+
+  // TODO(turbofan): Deoptimization is not supported yet.
+  if (function->code()->is_turbofanned() && !FLAG_turbo_deoptimization) {
+    return isolate->heap()->undefined_value();
+  }
+
+  Deoptimizer::DeoptimizeFunction(*function);
+
+  return isolate->heap()->undefined_value();
+}
+
+
 RUNTIME_FUNCTION(Runtime_RunningInSimulator) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 0);
 #if defined(USE_SIMULATOR)
   return isolate->heap()->true_value();
 #else
   return isolate->heap()->false_value();
 #endif
 }
 
@@ skipping 394 matching lines @@
   RUNTIME_FUNCTION(Runtime_HasFixed##Type##Elements) {                        \
     CONVERT_ARG_CHECKED(JSObject, obj, 0);                                    \
     return isolate->heap()->ToBoolean(obj->HasFixed##Type##Elements());       \
   }
 
 TYPED_ARRAYS(FIXED_TYPED_ARRAYS_CHECK_RUNTIME_FUNCTION)
 
 #undef FIXED_TYPED_ARRAYS_CHECK_RUNTIME_FUNCTION
 }
 }  // namespace v8::internal