Unify memory optimization modes and flags.

src/isolate.cc

 // Copyright 2012 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/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 1980 matching lines @@
       date_cache_(NULL),
       call_descriptor_data_(NULL),
       // TODO(bmeurer) Initialized lazily because it depends on flags; can
       // be fixed once the default isolate cleanup is done.
       random_number_generator_(NULL),
       rail_mode_(PERFORMANCE_ANIMATION),
       serializer_enabled_(enable_serializer),
       has_fatal_error_(false),
       initialized_from_snapshot_(false),
       is_tail_call_elimination_enabled_(true),
+      is_isolate_in_background_(false),
       cpu_profiler_(NULL),
       heap_profiler_(NULL),
       code_event_dispatcher_(new CodeEventDispatcher()),
       function_entry_hook_(NULL),
       deferred_handles_head_(NULL),
       optimizing_compile_dispatcher_(NULL),
       stress_deopt_count_(0),
       virtual_handler_register_(NULL),
       virtual_slot_register_(NULL),
       next_optimization_id_(0),
@@ skipping 1154 matching lines @@
   }
 }
 
 void Isolate::SetRAILMode(RAILMode rail_mode) {
   rail_mode_.SetValue(rail_mode);
   if (FLAG_trace_rail) {
     PrintIsolate(this, "RAIL mode: %s\n", RAILModeName(rail_mode));
   }
 }
 
+void Isolate::IsolateInBackgroundNotification() {
+  is_isolate_in_background_ = false;
+  heap()->ActivateMemoryReducerIfNeeded();
+}
+
+void Isolate::IsolateInForegroundNotification() {
+  is_isolate_in_background_ = true;
+}
+
 bool StackLimitCheck::JsHasOverflowed(uintptr_t gap) const {
   StackGuard* stack_guard = isolate_->stack_guard();
 #ifdef USE_SIMULATOR
   // The simulator uses a separate JS stack.
   Address jssp_address = Simulator::current(isolate_)->get_sp();
   uintptr_t jssp = reinterpret_cast<uintptr_t>(jssp_address);
   if (jssp - gap < stack_guard->real_jslimit()) return true;
 #endif  // USE_SIMULATOR
   return GetCurrentStackPosition() - gap < stack_guard->real_climit();
 }
@@ skipping 10 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8