Create a internal, global native context used only for generated code stubs

test/cctest/test-heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1505 matching lines @@
 
 
 // Count the number of native contexts in the weak list of native contexts.
 int CountNativeContexts() {
   int count = 0;
   Object* object = CcTest::heap()->native_contexts_list();
   while (!object->IsUndefined()) {
     count++;
     object = Context::cast(object)->get(Context::NEXT_CONTEXT_LINK);
   }
-  return count;
+  // Subtract one to compensate for the code stub context that is always present
+  return count - 1;
 }
 
 
 // Count the number of user functions in the weak list of optimized
 // functions attached to a native context.
 static int CountOptimizedUserFunctions(v8::Handle<v8::Context> context) {
   int count = 0;
   Handle<Context> icontext = v8::Utils::OpenHandle(*context);
   Object* object = icontext->get(Context::OPTIMIZED_FUNCTIONS_LIST);
   while (object->IsJSFunction() && !JSFunction::cast(object)->IsBuiltin()) {
@@ skipping 117 matching lines @@
   Heap* heap = isolate->heap();
   int count = 0;
   Handle<Object> object(heap->native_contexts_list(), isolate);
   while (!object->IsUndefined()) {
     count++;
     if (count == n) heap->CollectAllGarbage();
     object =
         Handle<Object>(Context::cast(*object)->get(Context::NEXT_CONTEXT_LINK),
                        isolate);
   }
-  return count;
+  // Subtract one to compensate for the code stub context that is always present
+  return count - 1;
 }
 
 
 // Count the number of user functions in the weak list of optimized
 // functions attached to a native context causing a GC after the
 // specified number of elements.
 static int CountOptimizedUserFunctionsWithGC(v8::Handle<v8::Context> context,
                                              int n) {
   int count = 0;
   Handle<Context> icontext = v8::Utils::OpenHandle(*context);
@@ skipping 556 matching lines @@
   CHECK(old_capacity == new_capacity);
 }
 
 
 static int NumberOfGlobalObjects() {
   int count = 0;
   HeapIterator iterator(CcTest::heap());
   for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
     if (obj->IsGlobalObject()) count++;
   }
-  return count;
+  // Subtract two to compensate for the two global objects (not global
+  // JSObjects, of which there would only be one) that are part of the code stub
+  // context, which is always present.
+  return count - 2;
 }
 
 
 // Test that we don't embed maps from foreign contexts into
 // optimized code.
 TEST(LeakNativeContextViaMap) {
   i::FLAG_allow_natives_syntax = true;
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope outer_scope(isolate);
   v8::Persistent<v8::Context> ctx1p;
@@ skipping 3796 matching lines @@
                                  array->address(),
                                  array->address() + array->Size());
   DCHECK(reinterpret_cast<void*>(buffer->Get(1)) ==
          HeapObject::RawField(heap->empty_fixed_array(),
                               FixedArrayBase::kLengthOffset));
   DCHECK(reinterpret_cast<void*>(buffer->Get(2)) ==
          HeapObject::RawField(heap->empty_fixed_array(),
                               FixedArrayBase::kLengthOffset));
   delete buffer;
 }