blob: a532851d842987b90e65be7d3ee10565094be4aa (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_COMPILER_ARM64_UNWINDING_INFO_WRITER_H_
#define V8_COMPILER_ARM64_UNWINDING_INFO_WRITER_H_
#include "src/eh-frame.h"
namespace v8 {
namespace internal {
namespace compiler {
class InstructionBlock;
class UnwindingInfoWriter {
public:
explicit UnwindingInfoWriter(Zone* zone)
: zone_(zone),
eh_frame_writer_(zone),
saved_lr_(false),
block_will_exit_(false),
block_initial_states_(zone) {
if (enabled()) eh_frame_writer_.Initialize();
}
void SetNumberOfInstructionBlocks(int number) {
if (enabled()) block_initial_states_.resize(number);
}
void BeginInstructionBlock(int pc_offset, const InstructionBlock* block);
void EndInstructionBlock(const InstructionBlock* block);
void MarkLinkRegisterOnTopOfStack(int pc_offset, const Register& sp);
void MarkPopLinkRegisterFromTopOfStack(int pc_offset);
void MarkFrameConstructed(int at_pc);
void MarkFrameDeconstructed(int at_pc);
void MarkBlockWillExit() { block_will_exit_ = true; }
void Finish(int code_size) {
if (enabled()) eh_frame_writer_.Finish(code_size);
}
EhFrameWriter* eh_frame_writer() {
return enabled() ? &eh_frame_writer_ : nullptr;
}
private:
bool enabled() const { return FLAG_perf_prof_unwinding_info; }
class BlockInitialState : public ZoneObject {
public:
explicit BlockInitialState(bool saved_lr) : saved_lr_(saved_lr) {}
bool saved_lr_;
};
Zone* zone_;
EhFrameWriter eh_frame_writer_;
bool saved_lr_;
bool block_will_exit_;
ZoneVector<const BlockInitialState*> block_initial_states_;
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif
|
