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      1 // Copyright 2014 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef V8_COMPILER_GAP_RESOLVER_H_
      6 #define V8_COMPILER_GAP_RESOLVER_H_
      7 
      8 #include "src/compiler/instruction.h"
      9 
     10 namespace v8 {
     11 namespace internal {
     12 namespace compiler {
     13 
     14 class GapResolver FINAL {
     15  public:
     16   // Interface used by the gap resolver to emit moves and swaps.
     17   class Assembler {
     18    public:
     19     virtual ~Assembler() {}
     20 
     21     // Assemble move.
     22     virtual void AssembleMove(InstructionOperand* source,
     23                               InstructionOperand* destination) = 0;
     24     // Assemble swap.
     25     virtual void AssembleSwap(InstructionOperand* source,
     26                               InstructionOperand* destination) = 0;
     27   };
     28 
     29   explicit GapResolver(Assembler* assembler) : assembler_(assembler) {}
     30 
     31   // Resolve a set of parallel moves, emitting assembler instructions.
     32   void Resolve(ParallelMove* parallel_move) const;
     33 
     34  private:
     35   // Perform the given move, possibly requiring other moves to satisfy
     36   // dependencies.
     37   void PerformMove(ZoneList<MoveOperands>* moves, MoveOperands* move) const;
     38 
     39   // Assembler used to emit moves and save registers.
     40   Assembler* const assembler_;
     41 };
     42 }
     43 }
     44 }  // namespace v8::internal::compiler
     45 
     46 #endif  // V8_COMPILER_GAP_RESOLVER_H_
     47