Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 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_ARM_LITHIUM_GAP_RESOLVER_ARM_H_ |
| 29 | #define V8_ARM_LITHIUM_GAP_RESOLVER_ARM_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: |
Ben Murdoch | e0cee9b | 2011-05-25 10:26:03 +0100 | [diff] [blame] | 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_ARM_LITHIUM_GAP_RESOLVER_ARM_H_ |