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:
~Assembler()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 
GapResolver(Assembler * assembler)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(ParallelMove* moves, MoveOperands* move) const;
38 
39   // Assembler used to emit moves and save registers.
40   Assembler* const assembler_;
41 };
42 
43 }  // namespace compiler
44 }  // namespace internal
45 }  // namespace v8
46 
47 #endif  // V8_COMPILER_GAP_RESOLVER_H_
48