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1 // Copyright 2013 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
4 // met:
5 //
6 //     * Redistributions of source code must retain the above copyright
7 //       notice, this list of conditions and the following disclaimer.
8 //     * Redistributions in binary form must reproduce the above
9 //       copyright notice, this list of conditions and the following
10 //       disclaimer in the documentation and/or other materials provided
11 //       with the distribution.
12 //     * Neither the name of Google Inc. nor the names of its
13 //       contributors may be used to endorse or promote products derived
14 //       from this software without specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
28 #ifndef V8_HYDROGEN_OSR_H_
29 #define V8_HYDROGEN_OSR_H_
30 
31 #include "hydrogen.h"
32 #include "ast.h"
33 #include "zone.h"
34 
35 namespace v8 {
36 namespace internal {
37 
38 // Responsible for building graph parts related to OSR and otherwise
39 // setting up the graph to do an OSR compile.
40 class HOsrBuilder : public ZoneObject {
41  public:
HOsrBuilder(HOptimizedGraphBuilder * builder)42   explicit HOsrBuilder(HOptimizedGraphBuilder* builder)
43     : unoptimized_frame_slots_(0),
44       builder_(builder),
45       osr_entry_(NULL),
46       osr_loop_entry_(NULL),
47       osr_values_(NULL) { }
48 
49   // Creates the loop entry block for the given statement, setting up OSR
50   // entries as necessary, and sets the current block to the new block.
51   HBasicBlock* BuildOsrLoopEntry(IterationStatement* statement);
52 
53   // Process the hydrogen graph after it has been completed, performing
54   // any OSR-specific cleanups or changes.
55   void FinishGraph();
56 
57   // Process the OSR values and phis after initial graph optimization.
58   void FinishOsrValues();
59 
60   // Return the number of slots in the unoptimized frame at the entry to OSR.
UnoptimizedFrameSlots()61   int UnoptimizedFrameSlots() const {
62     return unoptimized_frame_slots_;
63   }
64 
65   bool HasOsrEntryAt(IterationStatement* statement);
66 
67  private:
68   int unoptimized_frame_slots_;
69   HOptimizedGraphBuilder* builder_;
70   HBasicBlock* osr_entry_;
71   HBasicBlock* osr_loop_entry_;
72   ZoneList<HUnknownOSRValue*>* osr_values_;
73 };
74 
75 } }  // namespace v8::internal
76 
77 #endif  // V8_HYDROGEN_OSR_H_
78