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// 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_
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