1 | // Copyright 2016 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_X64_UNWINDING_INFO_WRITER_X64_H_ |
6 | #define V8_COMPILER_BACKEND_X64_UNWINDING_INFO_WRITER_X64_H_ |
7 | |
8 | #include "src/eh-frame.h" |
9 | #include "src/flags.h" |
10 | |
11 | namespace v8 { |
12 | namespace internal { |
13 | namespace compiler { |
14 | |
15 | class InstructionBlock; |
16 | |
17 | class UnwindingInfoWriter { |
18 | public: |
19 | explicit UnwindingInfoWriter(Zone* zone) |
20 | : zone_(zone), |
21 | eh_frame_writer_(zone), |
22 | tracking_fp_(false), |
23 | block_will_exit_(false), |
24 | block_initial_states_(zone) { |
25 | if (enabled()) eh_frame_writer_.Initialize(); |
26 | } |
27 | |
28 | void MaybeIncreaseBaseOffsetAt(int pc_offset, int base_delta) { |
29 | if (enabled() && !tracking_fp_) { |
30 | eh_frame_writer_.AdvanceLocation(pc_offset); |
31 | eh_frame_writer_.IncreaseBaseAddressOffset(base_delta); |
32 | } |
33 | } |
34 | |
35 | void SetNumberOfInstructionBlocks(int number) { |
36 | if (enabled()) block_initial_states_.resize(number); |
37 | } |
38 | |
39 | void BeginInstructionBlock(int pc_offset, const InstructionBlock* block); |
40 | void EndInstructionBlock(const InstructionBlock* block); |
41 | |
42 | void MarkFrameConstructed(int pc_base); |
43 | void MarkFrameDeconstructed(int pc_base); |
44 | |
45 | void MarkBlockWillExit() { block_will_exit_ = true; } |
46 | |
47 | void Finish(int code_size) { |
48 | if (enabled()) eh_frame_writer_.Finish(code_size); |
49 | } |
50 | |
51 | EhFrameWriter* eh_frame_writer() { |
52 | return enabled() ? &eh_frame_writer_ : nullptr; |
53 | } |
54 | |
55 | private: |
56 | bool enabled() const { return FLAG_perf_prof_unwinding_info; } |
57 | |
58 | class BlockInitialState : public ZoneObject { |
59 | public: |
60 | BlockInitialState(Register reg, int offset, bool tracking_fp) |
61 | : register_(reg), offset_(offset), tracking_fp_(tracking_fp) {} |
62 | |
63 | Register register_; |
64 | int offset_; |
65 | bool tracking_fp_; |
66 | }; |
67 | |
68 | Zone* zone_; |
69 | EhFrameWriter eh_frame_writer_; |
70 | bool tracking_fp_; |
71 | bool block_will_exit_; |
72 | |
73 | ZoneVector<const BlockInitialState*> block_initial_states_; |
74 | }; |
75 | |
76 | } // namespace compiler |
77 | } // namespace internal |
78 | } // namespace v8 |
79 | |
80 | #endif // V8_COMPILER_BACKEND_X64_UNWINDING_INFO_WRITER_X64_H_ |
81 | |