text: // 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_TYPER_H_
  #define V8_COMPILER_TYPER_H_
  
  #include "src/common/globals.h"
  #include "src/compiler/graph.h"
  #include "src/compiler/operation-typer.h"
  
  namespace v8 {
  namespace internal {
  
  class TickCounter;
  
  namespace compiler {
  
  // Forward declarations.
  class LoopVariableOptimizer;
  
  class V8_EXPORT_PRIVATE Typer {
   public:
    enum Flag : uint8_t {
      kNoFlags = 0,
      kThisIsReceiver = 1u << 0,       // Parameter this is an Object.
      kNewTargetIsReceiver = 1u << 1,  // Parameter new.target is an Object.
    };
    using Flags = base::Flags<Flag>;
  
    Typer(JSHeapBroker* broker, Flags flags, Graph* graph,
          TickCounter* tick_counter);
    ~Typer();
    Typer(const Typer&) = delete;
    Typer& operator=(const Typer&) = delete;
  
    void Run();
    // TODO(bmeurer,jarin): Remove this once we have a notion of "roots" on Graph.
    void Run(const ZoneVector<Node*>& roots,
             LoopVariableOptimizer* induction_vars);
  
   private:
    class Visitor;
    class Decorator;
  
    Flags flags() const { return flags_; }
    Graph* graph() const { return graph_; }
    Zone* zone() const { return graph()->zone(); }
    OperationTyper* operation_typer() { return &operation_typer_; }
    JSHeapBroker* broker() const { return broker_; }
  
    Flags const flags_;
    Graph* const graph_;
    Decorator* decorator_;
    TypeCache const* cache_;
    JSHeapBroker* broker_;
    OperationTyper operation_typer_;
    TickCounter* const tick_counter_;
  
    Type singleton_false_;
    Type singleton_true_;
  };
  
  DEFINE_OPERATORS_FOR_FLAGS(Typer::Flags)
  
  }  // namespace compiler
  }  // namespace internal
  }  // namespace v8
  
  #endif  // V8_COMPILER_TYPER_H_
  