v8  3.14.5(node0.10.28)
V8 is Google's open source JavaScript engine
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Pages
lithium-gap-resolver-mips.h
Go to the documentation of this file.
1 // Copyright 2011 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_MIPS_LITHIUM_GAP_RESOLVER_MIPS_H_
29 #define V8_MIPS_LITHIUM_GAP_RESOLVER_MIPS_H_
30 
31 #include "v8.h"
32 
33 #include "lithium.h"
34 
35 namespace v8 {
36 namespace internal {
37 
38 class LCodeGen;
39 class LGapResolver;
40 
41 class LGapResolver BASE_EMBEDDED {
42  public:
43  explicit LGapResolver(LCodeGen* owner);
44 
45  // Resolve a set of parallel moves, emitting assembler instructions.
46  void Resolve(LParallelMove* parallel_move);
47 
48  private:
49  // Build the initial list of moves.
50  void BuildInitialMoveList(LParallelMove* parallel_move);
51 
52  // Perform the move at the moves_ index in question (possibly requiring
53  // other moves to satisfy dependencies).
54  void PerformMove(int index);
55 
56  // If a cycle is found in the series of moves, save the blocking value to
57  // a scratch register. The cycle must be found by hitting the root of the
58  // depth-first search.
59  void BreakCycle(int index);
60 
61  // After a cycle has been resolved, restore the value from the scratch
62  // register to its proper destination.
63  void RestoreValue();
64 
65  // Emit a move and remove it from the move graph.
66  void EmitMove(int index);
67 
68  // Verify the move list before performing moves.
69  void Verify();
70 
71  LCodeGen* cgen_;
72 
73  // List of moves not yet resolved.
74  ZoneList<LMoveOperands> moves_;
75 
76  int root_index_;
77  bool in_cycle_;
78  LOperand* saved_destination_;
79 };
80 
81 } } // namespace v8::internal
82 
83 #endif // V8_MIPS_LITHIUM_GAP_RESOLVER_MIPS_H_
#define BASE_EMBEDDED
Definition: allocation.h:68