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
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
//===-- LibCxxAtomic.cpp --------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "LibCxxAtomic.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
//
// We are supporting two versions of libc++ std::atomic
//
// Given std::atomic<int> i;
//
// The previous version of std::atomic was laid out like this
//
// (lldb) frame var -L -R i
// 0x00007ffeefbff9a0: (std::__1::atomic<int>) i = {
// 0x00007ffeefbff9a0: std::__1::__atomic_base<int, true> = {
// 0x00007ffeefbff9a0: std::__1::__atomic_base<int, false> = {
// 0x00007ffeefbff9a0: __a_ = 5
// }
// }
// }
//
// In this case we need to obtain __a_ and the current version is laid out as so
//
// (lldb) frame var -L -R i
// 0x00007ffeefbff9b0: (std::__1::atomic<int>) i = {
// 0x00007ffeefbff9b0: std::__1::__atomic_base<int, true> = {
// 0x00007ffeefbff9b0: std::__1::__atomic_base<int, false> = {
// 0x00007ffeefbff9b0: __a_ = {
// 0x00007ffeefbff9b0: std::__1::__cxx_atomic_base_impl<int> = {
// 0x00007ffeefbff9b0: __a_value = 5
// }
// }
// }
// }
//}
//
// In this case we need to obtain __a_value
//
// The below method covers both cases and returns the relevant member as a
// ValueObjectSP
//
ValueObjectSP
lldb_private::formatters::GetLibCxxAtomicValue(ValueObject &valobj) {
ValueObjectSP non_sythetic = valobj.GetNonSyntheticValue();
if (!non_sythetic)
return {};
ValueObjectSP member__a_ =
non_sythetic->GetChildMemberWithName(ConstString("__a_"), true);
if (!member__a_)
return {};
ValueObjectSP member__a_value =
member__a_->GetChildMemberWithName(ConstString("__a_value"), true);
if (!member__a_value)
return member__a_;
return member__a_value;
}
bool lldb_private::formatters::LibCxxAtomicSummaryProvider(
ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
if (ValueObjectSP atomic_value = GetLibCxxAtomicValue(valobj)) {
std::string summary;
if (atomic_value->GetSummaryAsCString(summary, options) &&
summary.size() > 0) {
stream.Printf("%s", summary.c_str());
return true;
}
}
return false;
}
namespace lldb_private {
namespace formatters {
class LibcxxStdAtomicSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
public:
LibcxxStdAtomicSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
~LibcxxStdAtomicSyntheticFrontEnd() override = default;
size_t CalculateNumChildren() override;
lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
bool Update() override;
bool MightHaveChildren() override;
size_t GetIndexOfChildWithName(ConstString name) override;
private:
ValueObject *m_real_child;
};
} // namespace formatters
} // namespace lldb_private
lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
LibcxxStdAtomicSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp), m_real_child(nullptr) {}
bool lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::Update() {
ValueObjectSP atomic_value = GetLibCxxAtomicValue(m_backend);
if (atomic_value)
m_real_child = GetLibCxxAtomicValue(m_backend).get();
return false;
}
bool lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
MightHaveChildren() {
return true;
}
size_t lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
CalculateNumChildren() {
return m_real_child ? 1 : 0;
}
lldb::ValueObjectSP
lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::GetChildAtIndex(
size_t idx) {
if (idx == 0)
return m_real_child->GetSP()->Clone(ConstString("Value"));
return nullptr;
}
size_t lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
GetIndexOfChildWithName(ConstString name) {
return formatters::ExtractIndexFromString(name.GetCString());
}
SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxAtomicSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
if (valobj_sp)
return new LibcxxStdAtomicSyntheticFrontEnd(valobj_sp);
return nullptr;
}
|
