[debugger] remove mirror cache and v8::Debug::GetMirror.

src/debug/debug.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/debug/debug.h"
 
 #include <memory>
 
 #include "src/api.h"
 #include "src/arguments.h"
@@ skipping 1590 matching lines @@
     }
   }
 }
 
 
 bool Debug::IsDebugGlobal(JSGlobalObject* global) {
   return is_loaded() && global == debug_context()->global_object();
 }
 
 
-void Debug::ClearMirrorCache() {
-  PostponeInterruptsScope postpone(isolate_);
-  HandleScope scope(isolate_);
-  CallFunction("ClearMirrorCache", 0, NULL);
-}
-
-
 Handle<FixedArray> Debug::GetLoadedScripts() {
   isolate_->heap()->CollectAllGarbage(Heap::kFinalizeIncrementalMarkingMask,
                                       GarbageCollectionReason::kDebugger);
   Factory* factory = isolate_->factory();
   if (!factory->script_list()->IsWeakFixedArray()) {
     return factory->empty_fixed_array();
   }
   Handle<WeakFixedArray> array =
       Handle<WeakFixedArray>::cast(factory->script_list());
   Handle<FixedArray> results = factory->NewFixedArray(array->Length());
@@ skipping 688 matching lines @@
 
   debug_->UpdateState();
   // Make sure that debugger is loaded and enter the debugger context.
   // The previous context is kept in save_.
   failed_ = !debug_->is_loaded();
   if (!failed_) isolate()->set_context(*debug->debug_context());
 }
 
 
 DebugScope::~DebugScope() {
-  if (!failed_ && prev_ == NULL) {
-    // Clear mirror cache when leaving the debugger. Skip this if there is a
-    // pending exception as clearing the mirror cache calls back into
-    // JavaScript. This can happen if the v8::Debug::Call is used in which
-    // case the exception should end up in the calling code.
-    if (!isolate()->has_pending_exception()) debug_->ClearMirrorCache();
-  }
-
   // Leaving this debugger entry.
   base::NoBarrier_Store(&debug_->thread_local_.current_debug_scope_,
                         reinterpret_cast<base::AtomicWord>(prev_));
 
   // Restore to the previous break state.
   debug_->thread_local_.break_frame_id_ = break_frame_id_;
   debug_->thread_local_.break_id_ = break_id_;
   debug_->thread_local_.return_value_ = *return_value_;
 
   debug_->UpdateState();
@@ skipping 76 matching lines @@
   return v8::Utils::ToLocal(callback_data_);
 }
 
 
 v8::Isolate* EventDetailsImpl::GetIsolate() const {
   return reinterpret_cast<v8::Isolate*>(exec_state_->GetIsolate());
 }
 
 }  // namespace internal
 }  // namespace v8