erik.corry@gmail.com | 0511e24 | 2011-01-19 11:11:08 +0000 | [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_IA32_LITHIUM_GAP_RESOLVER_IA32_H_ |
| 29 | #define V8_IA32_LITHIUM_GAP_RESOLVER_IA32_H_ |
| 30 | |
| 31 | #include "v8.h" |
| 32 | |
vegorov@chromium.org | 0a4e901 | 2011-01-24 12:33:13 +0000 | [diff] [blame^] | 33 | #include "lithium.h" |
erik.corry@gmail.com | 0511e24 | 2011-01-19 11:11:08 +0000 | [diff] [blame] | 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 | // Emit any code necessary at the end of a gap move. |
| 57 | void Finish(); |
| 58 | |
| 59 | // Add or delete a move from the move graph without emitting any code. |
| 60 | // Used to build up the graph and remove trivial moves. |
| 61 | void AddMove(LMoveOperands move); |
| 62 | void RemoveMove(int index); |
| 63 | |
| 64 | // Report the count of uses of operand as a source in a not-yet-performed |
| 65 | // move. Used to rebuild use counts. |
| 66 | int CountSourceUses(LOperand* operand); |
| 67 | |
| 68 | // Emit a move and remove it from the move graph. |
| 69 | void EmitMove(int index); |
| 70 | |
| 71 | // Execute a move by emitting a swap of two operands. The move from |
| 72 | // source to destination is removed from the move graph. |
| 73 | void EmitSwap(int index); |
| 74 | |
| 75 | // Ensure that the given operand is not spilled. |
| 76 | void EnsureRestored(LOperand* operand); |
| 77 | |
| 78 | // Return a register that can be used as a temp register, spilling |
| 79 | // something if necessary. |
| 80 | Register EnsureTempRegister(); |
| 81 | |
| 82 | // Return a known free register different from the given one (which could |
| 83 | // be no_reg---returning any free register), or no_reg if there is no such |
| 84 | // register. |
| 85 | Register GetFreeRegisterNot(Register reg); |
| 86 | |
| 87 | // Verify that the state is the initial one, ready to resolve a single |
| 88 | // parallel move. |
| 89 | bool HasBeenReset(); |
| 90 | |
| 91 | // Verify the move list before performing moves. |
| 92 | void Verify(); |
| 93 | |
| 94 | LCodeGen* cgen_; |
| 95 | |
| 96 | // List of moves not yet resolved. |
| 97 | ZoneList<LMoveOperands> moves_; |
| 98 | |
| 99 | // Source and destination use counts for the general purpose registers. |
| 100 | int source_uses_[Register::kNumAllocatableRegisters]; |
| 101 | int destination_uses_[Register::kNumAllocatableRegisters]; |
| 102 | |
| 103 | // If we had to spill on demand, the currently spilled register's |
| 104 | // allocation index. |
| 105 | int spilled_register_; |
| 106 | }; |
| 107 | |
| 108 | } } // namespace v8::internal |
| 109 | |
| 110 | #endif // V8_IA32_LITHIUM_GAP_RESOLVER_IA32_H_ |