blob: 83949fa3ccb5a9aa191845123408be1f4d954a81 [file] [log] [blame]
// 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.
#include "src/compiler/graph-reducer.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() : context(), distance() {}
OuterContext(Handle<Context> context_, size_t distance_)
: context(context_), distance(distance_) {}
Handle<Context> context;
size_t distance;
// 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.
// The context can be the incoming function context or any outer context
// thereof, as indicated by {outer}'s {distance}.
class JSContextSpecialization final : public AdvancedReducer {
JSContextSpecialization(Editor* editor, JSGraph* jsgraph,
Maybe<OuterContext> outer,
MaybeHandle<JSFunction> closure)
: AdvancedReducer(editor),
closure_(closure) {}
const char* reducer_name() const override {
return "JSContextSpecialization";
Reduction Reduce(Node* node) final;
Reduction ReduceParameter(Node* node);
Reduction ReduceJSLoadContext(Node* node);
Reduction ReduceJSStoreContext(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_; }
JSGraph* const jsgraph_;
Maybe<OuterContext> outer_;
MaybeHandle<JSFunction> closure_;
} // namespace compiler
} // namespace internal
} // namespace v8