[heap] Do not invoke GC to make heap iterable.

src/runtime/runtime-debug.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/debug/debug-evaluate.h"
 #include "src/debug/debug-frames.h"
 #include "src/debug/debug-scopes.h"
@@ skipping 1213 matching lines @@
   DCHECK(args.length() == 3);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, target, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, filter, 1);
   RUNTIME_ASSERT(filter->IsUndefined() || filter->IsJSObject());
   CONVERT_NUMBER_CHECKED(int32_t, max_references, Int32, args[2]);
   RUNTIME_ASSERT(max_references >= 0);
 
   List<Handle<JSObject> > instances;
   Heap* heap = isolate->heap();
   {
-    HeapIterator iterator(heap, HeapIterator::kFilterUnreachable);
+    HeapIterator iterator(heap, HeapObjectsFiltering::kFilterUnreachable);
     // Get the constructor function for context extension and arguments array.
     Object* arguments_fun = isolate->sloppy_arguments_map()->GetConstructor();
     HeapObject* heap_obj;
     while ((heap_obj = iterator.next())) {
       if (!heap_obj->IsJSObject()) continue;
       JSObject* obj = JSObject::cast(heap_obj);
       if (obj->IsJSContextExtensionObject()) continue;
       if (obj->map()->GetConstructor() == arguments_fun) continue;
       if (!obj->ReferencesObject(*target)) continue;
       // Check filter if supplied. This is normally used to avoid
@@ skipping 34 matching lines @@
 RUNTIME_FUNCTION(Runtime_DebugConstructedBy) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, constructor, 0);
   CONVERT_NUMBER_CHECKED(int32_t, max_references, Int32, args[1]);
   RUNTIME_ASSERT(max_references >= 0);
 
   List<Handle<JSObject> > instances;
   Heap* heap = isolate->heap();
   {
-    HeapIterator iterator(heap, HeapIterator::kFilterUnreachable);
+    HeapIterator iterator(heap, HeapObjectsFiltering::kFilterUnreachable);
     HeapObject* heap_obj;
     while ((heap_obj = iterator.next())) {
       if (!heap_obj->IsJSObject()) continue;
       JSObject* obj = JSObject::cast(heap_obj);
       if (obj->map()->GetConstructor() != *constructor) continue;
       instances.Add(Handle<JSObject>(obj));
       if (instances.length() == max_references) break;
     }
     // Iterate the rest of the heap to satisfy HeapIterator constraints.
     while (iterator.next()) {
@@ skipping 248 matching lines @@
   return Smi::FromInt(isolate->debug()->is_active());
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 }  // namespace internal
 }  // namespace v8