1 // Copyright 2015 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_COMPILER_JS_GLOBAL_OBJECT_SPECIALIZATION_H_ 6 #define V8_COMPILER_JS_GLOBAL_OBJECT_SPECIALIZATION_H_ 7 8 #include "src/compiler/graph-reducer.h" 9 10 namespace v8 { 11 namespace internal { 12 13 // Forward declarations. 14 class CompilationDependencies; 15 16 namespace compiler { 17 18 // Forward declarations. 19 class CommonOperatorBuilder; 20 class JSGraph; 21 class JSOperatorBuilder; 22 class SimplifiedOperatorBuilder; 23 class TypeCache; 24 25 // Specializes a given JSGraph to a given global object, potentially constant 26 // folding some {JSLoadGlobal} nodes or strength reducing some {JSStoreGlobal} 27 // nodes. 28 class JSGlobalObjectSpecialization final : public AdvancedReducer { 29 public: 30 JSGlobalObjectSpecialization(Editor* editor, JSGraph* jsgraph, 31 Handle<JSGlobalObject> global_object, 32 CompilationDependencies* dependencies); 33 34 Reduction Reduce(Node* node) final; 35 36 private: 37 Reduction ReduceJSLoadGlobal(Node* node); 38 Reduction ReduceJSStoreGlobal(Node* node); 39 40 struct ScriptContextTableLookupResult; 41 bool LookupInScriptContextTable(Handle<Name> name, 42 ScriptContextTableLookupResult* result); 43 44 Graph* graph() const; jsgraph()45 JSGraph* jsgraph() const { return jsgraph_; } 46 Isolate* isolate() const; 47 CommonOperatorBuilder* common() const; 48 JSOperatorBuilder* javascript() const; 49 SimplifiedOperatorBuilder* simplified() const; global_object()50 Handle<JSGlobalObject> global_object() const { return global_object_; } dependencies()51 CompilationDependencies* dependencies() const { return dependencies_; } 52 53 JSGraph* const jsgraph_; 54 Handle<JSGlobalObject> const global_object_; 55 CompilationDependencies* const dependencies_; 56 TypeCache const& type_cache_; 57 58 DISALLOW_COPY_AND_ASSIGN(JSGlobalObjectSpecialization); 59 }; 60 61 } // namespace compiler 62 } // namespace internal 63 } // namespace v8 64 65 #endif // V8_COMPILER_JS_GLOBAL_OBJECT_SPECIALIZATION_H_ 66