Preliminary code for block scopes and block contexts.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index dbf3b95a941beca96cd1f77a35ea69de95a1a73c..e080cde3250b3d2780f4ab53b2538cca641878c5 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -1745,6 +1745,12 @@ bool Heap::CreateInitialMaps() {
   set_fixed_cow_array_map(Map::cast(obj));
   ASSERT(fixed_array_map() != fixed_cow_array_map());
 
+  { MaybeObject* maybe_obj =
+        AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
+    if (!maybe_obj->ToObject(&obj)) return false;
+  }
+  set_serialized_scope_info_map(Map::cast(obj));
+
   { MaybeObject* maybe_obj = AllocateMap(HEAP_NUMBER_TYPE, HeapNumber::kSize);
     if (!maybe_obj->ToObject(&obj)) return false;
   }
@@ -1910,6 +1916,12 @@ bool Heap::CreateInitialMaps() {
         AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
     if (!maybe_obj->ToObject(&obj)) return false;
   }
+  set_block_context_map(Map::cast(obj));
+
+  { MaybeObject* maybe_obj =
+        AllocateMap(FIXED_ARRAY_TYPE, kVariableSizeSentinel);
+    if (!maybe_obj->ToObject(&obj)) return false;
+  }
   Map* global_context_map = Map::cast(obj);
   global_context_map->set_visitor_id(StaticVisitorBase::kVisitGlobalContext);
   set_global_context_map(global_context_map);
@@ -4017,6 +4029,37 @@ MaybeObject* Heap::AllocateWithContext(JSFunction* function,
 }
 
 
+MaybeObject* Heap::AllocateBlockContext(JSFunction* function,
+                                        Context* previous,
+                                        SerializedScopeInfo* scope_info) {
+  Object* result;
+  { MaybeObject* maybe_result =
+        AllocateFixedArray(scope_info->NumberOfContextSlots());
+    if (!maybe_result->ToObject(&result)) return maybe_result;
+  }
+  // TODO(keuchel): properly initialize context slots.
+  Context* context = reinterpret_cast<Context*>(result);
+  context->set_map(block_context_map());
+  context->set_closure(function);
+  context->set_previous(previous);
+  context->set_extension(scope_info);
+  context->set_global(previous->global());
+  return context;
+}
+
+
+MaybeObject* Heap::AllocateSerializedScopeInfo(int length) {
+  Object* result;
+  { MaybeObject* maybe_result = AllocateFixedArray(length, TENURED);
+    if (!maybe_result->ToObject(&result)) return maybe_result;
+  }
+  SerializedScopeInfo* scope_info =
+      reinterpret_cast<SerializedScopeInfo*>(result);
+  scope_info->set_map(serialized_scope_info_map());
+  return scope_info;
+}
+
+
 MaybeObject* Heap::AllocateStruct(InstanceType type) {
   Map* map;
   switch (type) {