// 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_OBJECT_SPECIALIZATION_H_ #define V8_COMPILER_JS_GLOBAL_OBJECT_SPECIALIZATION_H_ #include "src/base/flags.h" #include "src/compiler/graph-reducer.h" namespace v8 { namespace internal { // Forward declarations. class CompilationDependencies; class TypeCache; namespace compiler { // Forward declarations. class CommonOperatorBuilder; class JSGraph; class JSOperatorBuilder; class SimplifiedOperatorBuilder; // Specializes a given JSGraph to a given global object, potentially constant // folding some {JSLoadGlobal} nodes or strength reducing some {JSStoreGlobal} // nodes. class JSGlobalObjectSpecialization final : public AdvancedReducer { public: // Flags that control the mode of operation. enum Flag { kNoFlags = 0u, kDeoptimizationEnabled = 1u << 0, }; typedef base::Flags<Flag> Flags; JSGlobalObjectSpecialization(Editor* editor, JSGraph* jsgraph, Flags flags, MaybeHandle<Context> native_context, CompilationDependencies* dependencies); Reduction Reduce(Node* node) final; private: Reduction ReduceJSLoadGlobal(Node* node); Reduction ReduceJSStoreGlobal(Node* node); // Retrieve the global object from the given {node} if known. MaybeHandle<JSGlobalObject> GetGlobalObject(Node* node); struct ScriptContextTableLookupResult; bool LookupInScriptContextTable(Handle<JSGlobalObject> global_object, 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; Flags flags() const { return flags_; } MaybeHandle<Context> native_context() const { return native_context_; } CompilationDependencies* dependencies() const { return dependencies_; } JSGraph* const jsgraph_; Flags const flags_; MaybeHandle<Context> native_context_; CompilationDependencies* const dependencies_; TypeCache const& type_cache_; DISALLOW_COPY_AND_ASSIGN(JSGlobalObjectSpecialization); }; DEFINE_OPERATORS_FOR_FLAGS(JSGlobalObjectSpecialization::Flags) } // namespace compiler } // namespace internal } // namespace v8 #endif // V8_COMPILER_JS_GLOBAL_OBJECT_SPECIALIZATION_H_