[turbofan] Initial support for monomorphic/polymorphic property loads.

src/compiler/js-global-specialization.h

 // 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_JS_GLOBAL_SPECIALIZATION_H_
 #define V8_COMPILER_JS_GLOBAL_SPECIALIZATION_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/simplified-operator.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class CompilationDependencies;
 
 
 namespace compiler {
 
 // Forward declarations.
 class CommonOperatorBuilder;
 class JSGraph;
 class JSOperatorBuilder;
+class MachineOperatorBuilder;
 
 
 // Specializes a given JSGraph to a given GlobalObject, potentially constant
 // folding some {LoadGlobal} nodes or strength reducing some {StoreGlobal}
 // nodes.
 class JSGlobalSpecialization final : public AdvancedReducer {
  public:
   // Flags that control the mode of operation.
   enum Flag {
     kNoFlags = 0u,
     kDeoptimizationEnabled = 1u << 0,
   };
   typedef base::Flags<Flag> Flags;
 
   JSGlobalSpecialization(Editor* editor, JSGraph* jsgraph, Flags flags,
                          Handle<GlobalObject> global_object,
-                         CompilationDependencies* dependencies);
+                         CompilationDependencies* dependencies, Zone* zone);
 
   Reduction Reduce(Node* node) final;
 
  private:
   Reduction ReduceJSLoadGlobal(Node* node);
   Reduction ReduceJSStoreGlobal(Node* node);
+  Reduction ReduceJSLoadNamed(Node* node);
 
   Reduction Replace(Node* node, Node* value, Node* effect = nullptr,
                     Node* control = nullptr) {
     ReplaceWithValue(node, value, effect, control);
     return Changed(value);
   }
   Reduction Replace(Node* node, Handle<Object> value);
 
+  class PropertyAccessInfo;
+  bool ComputePropertyAccessInfo(Handle<Map> map, Handle<Name> name,
+                                 PropertyAccessInfo* access_info);
+  bool ComputePropertyAccessInfos(MapHandleList const& maps, Handle<Name> name,
+                                  ZoneVector<PropertyAccessInfo>* access_infos);
+
   struct ScriptContextTableLookupResult;
   bool LookupInScriptContextTable(Handle<Name> name,
                                   ScriptContextTableLookupResult* result);
 
   Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }
   Isolate* isolate() const;
   CommonOperatorBuilder* common() const;
   JSOperatorBuilder* javascript() const;
   SimplifiedOperatorBuilder* simplified() const;
+  MachineOperatorBuilder* machine() const;
   Flags flags() const { return flags_; }
   Handle<GlobalObject> global_object() const { return global_object_; }
   CompilationDependencies* dependencies() const { return dependencies_; }
+  Zone* zone() const { return zone_; }
 
   JSGraph* const jsgraph_;
   Flags const flags_;
   Handle<GlobalObject> global_object_;
   CompilationDependencies* const dependencies_;
+  Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(JSGlobalSpecialization);
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(JSGlobalSpecialization::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_GLOBAL_SPECIALIZATION_H_