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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_A64_LITHIUM_GAP_RESOLVER_A64_H_ | |
29 #define V8_A64_LITHIUM_GAP_RESOLVER_A64_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 // Emit a move from one stack slot to another. | |
69 void EmitStackSlotMove(int index); | |
70 | |
71 // Verify the move list before performing moves. | |
72 void Verify(); | |
73 | |
74 LCodeGen* cgen_; | |
75 | |
76 // List of moves not yet resolved. | |
77 ZoneList<LMoveOperands> moves_; | |
78 | |
79 int root_index_; | |
80 bool in_cycle_; | |
81 LOperand* saved_destination_; | |
82 | |
83 // We use the root register as a scratch in a few places. When that happens, | |
84 // this flag is set to indicate that it needs to be restored. | |
85 bool need_to_restore_root_; | |
86 }; | |
87 | |
88 } } // namespace v8::internal | |
89 | |
90 #endif // V8_A64_LITHIUM_GAP_RESOLVER_A64_H_ | |
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