Line data    Source code

       1             : // Copyright 2014 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_COMPILER_OSR_H_
       6             : #define V8_COMPILER_OSR_H_
       7             : 
       8             : #include "src/zone/zone.h"
       9             : 
      10             : namespace v8 {
      11             : namespace internal {
      12             : 
      13             : class OptimizedCompilationInfo;
      14             : 
      15             : namespace compiler {
      16             : 
      17             : class Frame;
      18             : 
      19             : // Encapsulates logic relating to OSR compilations as well has handles some
      20             : // details of the frame layout.
      21             : class OsrHelper {
      22             :  public:
      23             :   explicit OsrHelper(OptimizedCompilationInfo* info);
      24             : 
      25             :   // Prepares the frame w.r.t. OSR.
      26             :   void SetupFrame(Frame* frame);
      27             : 
      28             :   // Returns the number of unoptimized frame slots for this OSR.
      29             :   size_t UnoptimizedFrameSlots() { return stack_slot_count_; }
      30             : 
      31             :   // Returns the environment index of the first stack slot.
      32             :   static int FirstStackSlotIndex(int parameter_count) {
      33             :     // TurboFan environments do not contain the context.
      34       21392 :     return 1 + parameter_count;  // receiver + params
      35             :   }
      36             : 
      37             :  private:
      38             :   size_t parameter_count_;
      39             :   size_t stack_slot_count_;
      40             : };
      41             : 
      42             : }  // namespace compiler
      43             : }  // namespace internal
      44             : }  // namespace v8
      45             : 
      46             : #endif  // V8_COMPILER_OSR_H_