osr.h

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// 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_OSR_H_
#define V8_COMPILER_OSR_H_
 
#include <stddef.h>
 
#include "src/base/macros.h"
 
namespace v8 {
namespace internal {
 
class OptimizedCompilationInfo;
 
namespace compiler {
 
class Frame;
 
// Encapsulates logic relating to OSR compilations as well has handles some
// details of the frame layout.
class OsrHelper {
 public:
  explicit OsrHelper(OptimizedCompilationInfo* info);
 
  // Prepares the frame w.r.t. OSR.
  V8_EXPORT_PRIVATE void SetupFrame(Frame* frame);
 
  // Returns the number of unoptimized frame slots for this OSR.
  size_t UnoptimizedFrameSlots() { return stack_slot_count_; }
 
  // Returns the environment index of the first stack slot.
  static int FirstStackSlotIndex(int parameter_count) {
    // TurboFan environments do not contain the context.
    return 1 + parameter_count;  // receiver + params
  }
 
 private:
  size_t parameter_count_;
  size_t stack_slot_count_;
};
 
}  // namespace compiler
}  // namespace internal
}  // namespace v8
 
#endif  // V8_COMPILER_OSR_H_