Introduce IsUndefined(Isolate*) and IsTheHole(Isolate*)

src/heap/heap.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/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/scopeinfo.h"
 #include "src/base/bits.h"
@@ skipping 1093 matching lines @@
 
 
 #ifdef VERIFY_HEAP
 // Helper class for verifying the string table.
 class StringTableVerifier : public ObjectVisitor {
  public:
   void VisitPointers(Object** start, Object** end) override {
     // Visit all HeapObject pointers in [start, end).
     for (Object** p = start; p < end; p++) {
       if ((*p)->IsHeapObject()) {
+        HeapObject* object = HeapObject::cast(*p);
+        Isolate* isolate = object->GetIsolate();
         // Check that the string is actually internalized.
-        CHECK((*p)->IsTheHole() || (*p)->IsUndefined() ||
-              (*p)->IsInternalizedString());
+        CHECK(object->IsTheHole(isolate) || object->IsUndefined(isolate) ||
+              object->IsInternalizedString());
       }
     }
   }
 };
 
 
 static void VerifyStringTable(Heap* heap) {
   StringTableVerifier verifier;
   heap->string_table()->IterateElements(&verifier);
 }
@@ skipping 78 matching lines @@
 }
 
 
 void Heap::ClearNormalizedMapCaches() {
   if (isolate_->bootstrapper()->IsActive() &&
       !incremental_marking()->IsMarking()) {
     return;
   }
 
   Object* context = native_contexts_list();
-  while (!context->IsUndefined()) {
+  while (!context->IsUndefined(isolate())) {
     // GC can happen when the context is not fully initialized,
     // so the cache can be undefined.
     Object* cache =
         Context::cast(context)->get(Context::NORMALIZED_MAP_CACHE_INDEX);
-    if (!cache->IsUndefined()) {
+    if (!cache->IsUndefined(isolate())) {
       NormalizedMapCache::cast(cache)->Clear();
     }
     context = Context::cast(context)->next_context_link();
   }
 }
 
 
 void Heap::UpdateSurvivalStatistics(int start_new_space_size) {
   if (start_new_space_size == 0) return;
 
@@ skipping 5023 matching lines @@
   for (int index = 0; index < kLength; index++) keys_[index].map = NULL;
 }
 
 
 void DescriptorLookupCache::Clear() {
   for (int index = 0; index < kLength; index++) keys_[index].source = NULL;
 }
 
 void Heap::ExternalStringTable::CleanUp() {
   int last = 0;
+  Isolate* isolate = heap_->isolate();
   for (int i = 0; i < new_space_strings_.length(); ++i) {
-    if (new_space_strings_[i] == heap_->the_hole_value()) {
+    if (new_space_strings_[i]->IsTheHole(isolate)) {
       continue;
     }
     DCHECK(new_space_strings_[i]->IsExternalString());
     if (heap_->InNewSpace(new_space_strings_[i])) {
       new_space_strings_[last++] = new_space_strings_[i];
     } else {
       old_space_strings_.Add(new_space_strings_[i]);
     }
   }
   new_space_strings_.Rewind(last);
   new_space_strings_.Trim();
 
   last = 0;
   for (int i = 0; i < old_space_strings_.length(); ++i) {
-    if (old_space_strings_[i] == heap_->the_hole_value()) {
+    if (old_space_strings_[i]->IsTheHole(isolate)) {
       continue;
     }
     DCHECK(old_space_strings_[i]->IsExternalString());
     DCHECK(!heap_->InNewSpace(old_space_strings_[i]));
     old_space_strings_[last++] = old_space_strings_[i];
   }
   old_space_strings_.Rewind(last);
   old_space_strings_.Trim();
 #ifdef VERIFY_HEAP
   if (FLAG_verify_heap) {
@@ skipping 114 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8