[deoptimizer] Clear context before NotifyDeoptimized.

src/runtime/runtime-compiler.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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/asmjs/asm-js.h"
 #include "src/compiler-dispatcher/optimizing-compile-dispatcher.h"
 #include "src/compiler.h"
@@ skipping 154 matching lines @@
   Deoptimizer* deoptimizer = Deoptimizer::Grab(isolate);
   DCHECK(AllowHeapAllocation::IsAllowed());
   TimerEventScope<TimerEventDeoptimizeCode> timer(isolate);
   TRACE_EVENT0("v8", "V8.DeoptimizeCode");
 
   Handle<JSFunction> function = deoptimizer->function();
   Handle<Code> optimized_code = deoptimizer->compiled_code();
 
   DCHECK(optimized_code->kind() == Code::OPTIMIZED_FUNCTION);
   DCHECK(type == deoptimizer->bailout_type());
+  DCHECK_NULL(isolate->context());
+
+  // TODO(turbofan): For Crankshaft we restore the context before objects are
+  // being materialized, because it never de-materializes the context but it
+  // requires a context to materialize arguments objects. This is specific to
+  // Crankshaft and can be removed once only TurboFan goes through here.
+  if (!optimized_code->is_turbofanned()) {
+    JavaScriptFrameIterator top_it(isolate);
+    JavaScriptFrame* top_frame = top_it.frame();
+    isolate->set_context(Context::cast(top_frame->context()));
+  }
 
   // Make sure to materialize objects before causing any allocation.
   JavaScriptFrameIterator it(isolate);
   deoptimizer->MaterializeHeapObjects(&it);
   delete deoptimizer;
 
   // Ensure the context register is updated for materialized objects.
-  JavaScriptFrameIterator top_it(isolate);
-  JavaScriptFrame* top_frame = top_it.frame();
-  isolate->set_context(Context::cast(top_frame->context()));
+  if (optimized_code->is_turbofanned()) {
+    JavaScriptFrameIterator top_it(isolate);
+    JavaScriptFrame* top_frame = top_it.frame();
+    isolate->set_context(Context::cast(top_frame->context()));
+  }
 
   if (type == Deoptimizer::LAZY) {
     return isolate->heap()->undefined_value();
   }
 
   // Search for other activations of the same optimized code.
   // At this point {it} is at the topmost frame of all the frames materialized
   // by the deoptimizer. Note that this frame does not necessarily represent
   // an activation of {function} because of potential inlined tail-calls.
   ActivationsFinder activations_finder(*optimized_code);
@@ skipping 253 matching lines @@
   DCHECK(is_valid_language_mode(args.smi_at(3)));
   LanguageMode language_mode = static_cast<LanguageMode>(args.smi_at(3));
   DCHECK(args[4]->IsSmi());
   Handle<SharedFunctionInfo> outer_info(args.at<JSFunction>(2)->shared(),
                                         isolate);
   return CompileGlobalEval(isolate, args.at<String>(1), outer_info,
                            language_mode, args.smi_at(4), args.smi_at(5));
 }
 }  // namespace internal
 }  // namespace v8