// 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 "src/zone/zone.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_