[turbofan] Refactor property access building.

src/compiler/property-access-builder.h

+// Copyright 2017 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_PROPERTY_ACCESS_BUILDER_H_
+#define V8_COMPILER_PROPERTY_ACCESS_BUILDER_H_
+
+#include <vector>
+
+#include "src/handles.h"
+#include "src/objects/map.h"
+#include "src/zone/zone-containers.h"
+
+namespace v8 {
+namespace internal {
+
+class CompilationDependencies;
+
+namespace compiler {
+
+class CommonOperatorBuilder;
+class Graph;
+class JSGraph;
+class Node;
+class PropertyAccessInfo;
+class SimplifiedOperatorBuilder;
+
+class PropertyAccessBuilder {
+ public:
+  PropertyAccessBuilder(JSGraph* jsgraph, CompilationDependencies* dependencies)
+      : jsgraph_(jsgraph), dependencies_(dependencies) {}
+
+  // Builds the appropriate string check if the maps are only string
+  // maps.
+  bool TryBuildStringCheck(MapHandles const& maps, Node** receiver,
+                           Node** effect, Node* control);
+  // Builds a number check if all maps are number maps.
+  bool TryBuildNumberCheck(MapHandles const& maps, Node** receiver,
+                           Node** effect, Node* control);
+
+  Node* BuildCheckHeapObject(Node* receiver, Node** effect, Node* control);
+  void BuildCheckMaps(Node* receiver, Node** effect, Node* control,
+                      std::vector<Handle<Map>> const& receiver_maps);
+
+  // Adds stability dependencies on all prototypes of every class in
+  // {receiver_type} up to (and including) the {holder}.
+  void AssumePrototypesStable(Handle<Context> native_context,
+                              std::vector<Handle<Map>> const& receiver_maps,
+                              Handle<JSObject> holder);
+
+  // Builds the actual load for data-field and data-constant-field
+  // properties (without heap-object or map checks).
+  Node* BuildLoadDataField(Handle<Name> name,
+                           PropertyAccessInfo const& access_info,
+                           Node* receiver, Node** effect, Node** control);
+
+ private:
+  JSGraph* jsgraph() const { return jsgraph_; }
+  CompilationDependencies* dependencies() const { return dependencies_; }
+  Graph* graph() const;
+  Isolate* isolate() const;
+  CommonOperatorBuilder* common() const;
+  SimplifiedOperatorBuilder* simplified() const;
+
+  Node* TryBuildLoadConstantDataField(Handle<Name> name,
+                                      PropertyAccessInfo const& access_info,
+                                      Node* receiver);
+  // Returns a node with the holder for the property access described by
+  // {access_info}.
+  Node* ResolveHolder(PropertyAccessInfo const& access_info, Node* receiver);
+
+  static bool HasOnlyNumberMaps(MapHandles const& maps);

[Michael Starzinger, 2017/06/16 08:32:22]

nit: Can we remove these static helpers from the header and put them into an
anonymous namespace in the .cc-file instead?

[Jarin, 2017/06/16 09:32:27]

Done.

+  static bool HasOnlyStringMaps(MapHandles const& maps);
+  static bool HasOnlySequentialStringMaps(MapHandles const& maps);
+
+  JSGraph* jsgraph_;
+  CompilationDependencies* dependencies_;
+};
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_COMPILER_PROPERTY_ACCESS_BUILDER_H_