1 | // Copyright 2015 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_BACKEND_FRAME_ELIDER_H_ |
6 | #define V8_COMPILER_BACKEND_FRAME_ELIDER_H_ |
7 | |
8 | #include "src/compiler/backend/instruction.h" |
9 | |
10 | namespace v8 { |
11 | namespace internal { |
12 | namespace compiler { |
13 | |
14 | // Determine which instruction blocks need a frame and where frames must be |
15 | // constructed/deconstructed. |
16 | class FrameElider { |
17 | public: |
18 | explicit FrameElider(InstructionSequence* code); |
19 | void Run(); |
20 | |
21 | private: |
22 | void MarkBlocks(); |
23 | void PropagateMarks(); |
24 | void MarkDeConstruction(); |
25 | bool PropagateInOrder(); |
26 | bool PropagateReversed(); |
27 | bool PropagateIntoBlock(InstructionBlock* block); |
28 | const InstructionBlocks& instruction_blocks() const; |
29 | InstructionBlock* InstructionBlockAt(RpoNumber rpo_number) const; |
30 | Instruction* InstructionAt(int index) const; |
31 | |
32 | InstructionSequence* const code_; |
33 | }; |
34 | |
35 | } // namespace compiler |
36 | } // namespace internal |
37 | } // namespace v8 |
38 | |
39 | #endif // V8_COMPILER_BACKEND_FRAME_ELIDER_H_ |
40 |