// Copyright 2014 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_COMPILER_OSR_H_
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#define V8_COMPILER_OSR_H_
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#include "src/zone/zone.h"
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namespace v8 {
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namespace internal {
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class OptimizedCompilationInfo;
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namespace compiler {
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class Frame;
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// Encapsulates logic relating to OSR compilations as well has handles some
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// details of the frame layout.
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class OsrHelper {
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public:
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explicit OsrHelper(OptimizedCompilationInfo* info);
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// Prepares the frame w.r.t. OSR.
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void SetupFrame(Frame* frame);
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// Returns the number of unoptimized frame slots for this OSR.
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size_t UnoptimizedFrameSlots() { return stack_slot_count_; }
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// Returns the environment index of the first stack slot.
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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
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}
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private:
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size_t parameter_count_;
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size_t stack_slot_count_;
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};
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} // namespace compiler
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} // namespace internal
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} // namespace v8
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#endif // V8_COMPILER_OSR_H_
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