osr.h 1.12 KB
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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_

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#include "src/zone/zone.h"
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namespace v8 {
namespace internal {

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class OptimizedCompilationInfo;
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namespace compiler {

class Frame;

// Encapsulates logic relating to OSR compilations as well has handles some
// details of the frame layout.
class OsrHelper {
 public:
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  explicit OsrHelper(OptimizedCompilationInfo* info);
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  // Prepares the frame w.r.t. OSR.
  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) {
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    // TurboFan environments do not contain the context.
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    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_