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 35namespace v8 { 36namespace internal { 37 38class LCodeGen; 39class LGapResolver; 40 41class 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_ 84