[inspector] cache stack frame for call sites

src/api.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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 8668 matching lines @@
 
 
 bool Isolate::IdleNotificationDeadline(double deadline_in_seconds) {
   // Returning true tells the caller that it need not
   // continue to call IdleNotification.
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   if (!i::FLAG_use_idle_notification) return true;
   return isolate->heap()->IdleNotification(deadline_in_seconds);
 }
 
-
 void Isolate::LowMemoryNotification() {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   {
     i::HistogramTimerScope idle_notification_scope(
         isolate->counters()->gc_low_memory_notification());
     TRACE_EVENT0("v8", "V8.GCLowMemoryNotification");
     isolate->heap()->CollectAllAvailableGarbage(
         i::GarbageCollectionReason::kLowMemoryNotification);
   }
+  {
+    i::HeapIterator iterator(isolate->heap());
+    i::HeapObject* obj;
+    while ((obj = iterator.next()) != nullptr) {
+      if (obj->IsCode() || obj->IsBytecodeArray()) {

[Yang, 2017/04/11 13:09:46]

IsAbstractCode

[kozy, 2017/04/12 15:05:17]

Done.

+        i::AbstractCode::cast(obj)->DropStackFrameCache();
+      }
+    }
+  }
 }
 
 
 int Isolate::ContextDisposedNotification(bool dependant_context) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   return isolate->heap()->NotifyContextDisposed(dependant_context);
 }
 
 
 void Isolate::IsolateInForegroundNotification() {
@@ skipping 1681 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8