Reland [heap] Avoid the use of cells to point from code to new-space objects.

src/objects-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/objects.h"
 
 #include "src/bootstrapper.h"
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/field-type.h"
@@ skipping 674 matching lines @@
   HandleScope scope(isolate);
   int mode_mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT);
   for (RelocIterator it(this, mode_mask); !it.done(); it.next()) {
     Object* obj = it.rinfo()->target_object();
     if (IsWeakObject(obj)) {
       if (obj->IsMap()) {
         Map* map = Map::cast(obj);
         CHECK(map->dependent_code()->Contains(DependentCode::kWeakCodeGroup,
                                               cell));
       } else if (obj->IsJSObject()) {
-        WeakHashTable* table =
-            GetIsolate()->heap()->weak_object_to_code_table();
-        Handle<HeapObject> key_obj(HeapObject::cast(obj), isolate);
-        CHECK(DependentCode::cast(table->Lookup(key_obj))
-                  ->Contains(DependentCode::kWeakCodeGroup, cell));
+        if (isolate->heap()->InNewSpace(obj)) {
+          ArrayList* list =
+              GetIsolate()->heap()->weak_new_space_object_to_code_list();
+          bool found = false;
+          for (int i = 0; i < list->Length(); i += 2) {
+            WeakCell* obj_cell = WeakCell::cast(list->Get(i));
+            if (!obj_cell->cleared() && obj_cell->value() == obj &&
+                WeakCell::cast(list->Get(i + 1)) == cell) {
+              found = true;
+              break;
+            }
+          }
+          CHECK(found);
+        } else {
+          Handle<HeapObject> key_obj(HeapObject::cast(obj), isolate);
+          DependentCode* dep =
+              GetIsolate()->heap()->LookupWeakObjectToCodeDependency(key_obj);
+          dep->Contains(DependentCode::kWeakCodeGroup, cell);
+        }
       }
     }
   }
 }
 
 
 void JSArray::JSArrayVerify() {
   JSObjectVerify();
   Isolate* isolate = GetIsolate();
   CHECK(length()->IsNumber() || length()->IsUndefined(isolate));
@@ skipping 609 matching lines @@
 
   // Both are done at the same time.
   CHECK_EQ(new_it.done(), old_it.done());
 }
 
 
 #endif  // DEBUG
 
 }  // namespace internal
 }  // namespace v8