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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>
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.
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_
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