// Copyright 2014 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_CONTEXT_SPECIALIZATION_H_ #define V8_COMPILER_JS_CONTEXT_SPECIALIZATION_H_ #include "src/compiler/graph-reducer.h" #include "src/handles/maybe-handles.h" namespace v8 { namespace internal { namespace compiler { // Forward declarations. class JSGraph; class JSOperatorBuilder; // Pair of a context and its distance from some point of reference. struct OuterContext { OuterContext() = default; OuterContext(Handle<Context> context_, size_t distance_) : context(context_), distance(distance_) {} Handle<Context> context; size_t distance = 0; }; // Specializes a given JSGraph to a given context, potentially constant folding // some {LoadContext} nodes or strength reducing some {StoreContext} nodes. // Additionally, constant-folds the function parameter if {closure} is given, // and constant-folds import.meta loads if the corresponding object already // exists. // // The context can be the incoming function context or any outer context // thereof, as indicated by {outer}'s {distance}. class V8_EXPORT_PRIVATE JSContextSpecialization final : public AdvancedReducer { public: JSContextSpecialization(Editor* editor, JSGraph* jsgraph, JSHeapBroker* broker, Maybe<OuterContext> outer, MaybeHandle<JSFunction> closure) : AdvancedReducer(editor), jsgraph_(jsgraph), outer_(outer), closure_(closure), broker_(broker) {} JSContextSpecialization(const JSContextSpecialization&) = delete; JSContextSpecialization& operator=(const JSContextSpecialization&) = delete; const char* reducer_name() const override { return "JSContextSpecialization"; } Reduction Reduce(Node* node) final; private: Reduction ReduceParameter(Node* node); Reduction ReduceJSLoadContext(Node* node); Reduction ReduceJSStoreContext(Node* node); Reduction ReduceJSGetImportMeta(Node* node); Reduction SimplifyJSStoreContext(Node* node, Node* new_context, size_t new_depth); Reduction SimplifyJSLoadContext(Node* node, Node* new_context, size_t new_depth); Isolate* isolate() const; JSGraph* jsgraph() const { return jsgraph_; } Maybe<OuterContext> outer() const { return outer_; } MaybeHandle<JSFunction> closure() const { return closure_; } JSHeapBroker* broker() const { return broker_; } JSGraph* const jsgraph_; Maybe<OuterContext> outer_; MaybeHandle<JSFunction> closure_; JSHeapBroker* const broker_; }; } // namespace compiler } // namespace internal } // namespace v8 #endif // V8_COMPILER_JS_CONTEXT_SPECIALIZATION_H_