1 files changed, 146 insertions, 0 deletions
diff --git a/deps/v8/src/compiler/access-info.h b/deps/v8/src/compiler/access-info.h
new file mode 100644
index 0000000000..4f60552111
--- /dev/null
+++ b/deps/v8/src/compiler/access-info.h
@@ -0,0 +1,146 @@
+// Copyright 2015 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.
+
+#ifndef V8_COMPILER_ACCESS_INFO_H_
+#define V8_COMPILER_ACCESS_INFO_H_
+
+#include <iosfwd>
+
+#include "src/field-index.h"
+#include "src/objects.h"
+#include "src/zone-containers.h"
+
+namespace v8 {
+namespace internal {
+
+// Forward declarations.
+class CompilationDependencies;
+class Factory;
+class TypeCache;
+
+
+namespace compiler {
+
+// Whether we are loading a property or storing to a property.
+enum class AccessMode { kLoad, kStore };
+
+std::ostream& operator<<(std::ostream&, AccessMode);
+
+
+// This class encapsulates all information required to access a certain element.
+class ElementAccessInfo final {
+ public:
+  ElementAccessInfo();
+  ElementAccessInfo(Type* receiver_type, ElementsKind elements_kind,
+                    MaybeHandle<JSObject> holder)
+      : elements_kind_(elements_kind),
+        holder_(holder),
+        receiver_type_(receiver_type) {}
+
+  MaybeHandle<JSObject> holder() const { return holder_; }
+  ElementsKind elements_kind() const { return elements_kind_; }
+  Type* receiver_type() const { return receiver_type_; }
+
+ private:
+  ElementsKind elements_kind_;
+  MaybeHandle<JSObject> holder_;
+  Type* receiver_type_;
+};
+
+
+// This class encapsulates all information required to access a certain
+// object property, either on the object itself or on the prototype chain.
+class PropertyAccessInfo final {
+ public:
+  enum Kind { kInvalid, kNotFound, kDataConstant, kDataField };
+
+  static PropertyAccessInfo NotFound(Type* receiver_type,
+                                     MaybeHandle<JSObject> holder);
+  static PropertyAccessInfo DataConstant(Type* receiver_type,
+                                         Handle<Object> constant,
+                                         MaybeHandle<JSObject> holder);
+  static PropertyAccessInfo DataField(
+      Type* receiver_type, FieldIndex field_index, Type* field_type,
+      MaybeHandle<JSObject> holder = MaybeHandle<JSObject>(),
+      MaybeHandle<Map> transition_map = MaybeHandle<Map>());
+
+  PropertyAccessInfo();
+
+  bool IsNotFound() const { return kind() == kNotFound; }
+  bool IsDataConstant() const { return kind() == kDataConstant; }
+  bool IsDataField() const { return kind() == kDataField; }
+
+  bool HasTransitionMap() const { return !transition_map().is_null(); }
+
+  Kind kind() const { return kind_; }
+  MaybeHandle<JSObject> holder() const { return holder_; }
+  MaybeHandle<Map> transition_map() const { return transition_map_; }
+  Handle<Object> constant() const { return constant_; }
+  FieldIndex field_index() const { return field_index_; }
+  Type* field_type() const { return field_type_; }
+  Type* receiver_type() const { return receiver_type_; }
+
+ private:
+  PropertyAccessInfo(MaybeHandle<JSObject> holder, Type* receiver_type);
+  PropertyAccessInfo(MaybeHandle<JSObject> holder, Handle<Object> constant,
+                     Type* receiver_type);
+  PropertyAccessInfo(MaybeHandle<JSObject> holder,
+                     MaybeHandle<Map> transition_map, FieldIndex field_index,
+                     Type* field_type, Type* receiver_type);
+
+  Kind kind_;
+  Type* receiver_type_;
+  Handle<Object> constant_;
+  MaybeHandle<Map> transition_map_;
+  MaybeHandle<JSObject> holder_;
+  FieldIndex field_index_;
+  Type* field_type_;
+};
+
+
+// Factory class for {ElementAccessInfo}s and {PropertyAccessInfo}s.
+class AccessInfoFactory final {
+ public:
+  AccessInfoFactory(CompilationDependencies* dependencies,
+                    Handle<Context> native_context, Zone* zone);
+
+  bool ComputeElementAccessInfo(Handle<Map> map, AccessMode access_mode,
+                                ElementAccessInfo* access_info);
+  bool ComputeElementAccessInfos(MapHandleList const& maps,
+                                 AccessMode access_mode,
+                                 ZoneVector<ElementAccessInfo>* access_infos);
+  bool ComputePropertyAccessInfo(Handle<Map> map, Handle<Name> name,
+                                 AccessMode access_mode,
+                                 PropertyAccessInfo* access_info);
+  bool ComputePropertyAccessInfos(MapHandleList const& maps, Handle<Name> name,
+                                  AccessMode access_mode,
+                                  ZoneVector<PropertyAccessInfo>* access_infos);
+
+ private:
+  bool LookupSpecialFieldAccessor(Handle<Map> map, Handle<Name> name,
+                                  PropertyAccessInfo* access_info);
+  bool LookupTransition(Handle<Map> map, Handle<Name> name,
+                        MaybeHandle<JSObject> holder,
+                        PropertyAccessInfo* access_info);
+
+  CompilationDependencies* dependencies() const { return dependencies_; }
+  Factory* factory() const;
+  Isolate* isolate() const { return isolate_; }
+  Handle<Context> native_context() const { return native_context_; }
+  Zone* zone() const { return zone_; }
+
+  CompilationDependencies* const dependencies_;
+  Handle<Context> const native_context_;
+  Isolate* const isolate_;
+  TypeCache const& type_cache_;
+  Zone* const zone_;
+
+  DISALLOW_COPY_AND_ASSIGN(AccessInfoFactory);
+};
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_COMPILER_ACCESS_INFO_H_