1// Copyright 2013 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_HYDROGEN_OSR_H_
6#define V8_HYDROGEN_OSR_H_
7
8#include "src/hydrogen.h"
9#include "src/ast.h"
10#include "src/zone.h"
11
12namespace v8 {
13namespace internal {
14
15// Responsible for building graph parts related to OSR and otherwise
16// setting up the graph to do an OSR compile.
17class HOsrBuilder : public ZoneObject {
18 public:
19  explicit HOsrBuilder(HOptimizedGraphBuilder* builder)
20    : unoptimized_frame_slots_(0),
21      builder_(builder),
22      osr_entry_(NULL),
23      osr_loop_entry_(NULL),
24      osr_values_(NULL) { }
25
26  // Creates the loop entry block for the given statement, setting up OSR
27  // entries as necessary, and sets the current block to the new block.
28  HBasicBlock* BuildOsrLoopEntry(IterationStatement* statement);
29
30  // Process the hydrogen graph after it has been completed, performing
31  // any OSR-specific cleanups or changes.
32  void FinishGraph();
33
34  // Process the OSR values and phis after initial graph optimization.
35  void FinishOsrValues();
36
37  // Return the number of slots in the unoptimized frame at the entry to OSR.
38  int UnoptimizedFrameSlots() const {
39    return unoptimized_frame_slots_;
40  }
41
42  bool HasOsrEntryAt(IterationStatement* statement);
43
44 private:
45  int unoptimized_frame_slots_;
46  HOptimizedGraphBuilder* builder_;
47  HBasicBlock* osr_entry_;
48  HBasicBlock* osr_loop_entry_;
49  ZoneList<HUnknownOSRValue*>* osr_values_;
50};
51
52} }  // namespace v8::internal
53
54#endif  // V8_HYDROGEN_OSR_H_
55