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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
//===-- LibCxxProxyArray.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 "LibCxx.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
#include "lldb/ValueObject/ValueObject.h"
#include <optional>
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
namespace lldb_private {
namespace formatters {
/// Data formatter for libc++'s std::"proxy_array".
///
/// A proxy_array's are created by using:
/// std::gslice_array operator[](const std::gslice& gslicearr);
/// std::mask_array operator[](const std::valarray<bool>& boolarr);
/// std::indirect_array operator[](const std::valarray<std::size_t>& indarr);
///
/// These arrays have the following members:
/// - __vp_ points to std::valarray::__begin_
/// - __1d_ an array of offsets of the elements from @a __vp_
class LibcxxStdProxyArraySyntheticFrontEnd : public SyntheticChildrenFrontEnd {
public:
LibcxxStdProxyArraySyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
~LibcxxStdProxyArraySyntheticFrontEnd() override;
llvm::Expected<uint32_t> CalculateNumChildren() override;
lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override;
lldb::ChildCacheState Update() override;
llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override;
private:
/// A non-owning pointer to the array's __vp_.
ValueObject *m_base = nullptr;
/// The type of the array's template argument T.
CompilerType m_element_type;
/// The sizeof the array's template argument T.
uint32_t m_element_size = 0;
/// A non-owning pointer to the array's __1d_.__begin_.
ValueObject *m_start = nullptr;
/// A non-owning pointer to the array's __1d_.__end_.
ValueObject *m_finish = nullptr;
/// The type of the __1d_ array's template argument T (size_t).
CompilerType m_element_type_size_t;
/// The sizeof the __1d_ array's template argument T (size_t)
uint32_t m_element_size_size_t = 0;
};
} // namespace formatters
} // namespace lldb_private
lldb_private::formatters::LibcxxStdProxyArraySyntheticFrontEnd::
LibcxxStdProxyArraySyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp), m_element_type() {
if (valobj_sp)
Update();
}
lldb_private::formatters::LibcxxStdProxyArraySyntheticFrontEnd::
~LibcxxStdProxyArraySyntheticFrontEnd() {
// these need to stay around because they are child objects who will follow
// their parent's life cycle
// delete m_base;
}
llvm::Expected<uint32_t> lldb_private::formatters::
LibcxxStdProxyArraySyntheticFrontEnd::CalculateNumChildren() {
if (!m_start || !m_finish)
return 0;
uint64_t start_val = m_start->GetValueAsUnsigned(0);
uint64_t finish_val = m_finish->GetValueAsUnsigned(0);
if (start_val == 0 || finish_val == 0)
return 0;
if (start_val >= finish_val)
return 0;
size_t num_children = (finish_val - start_val);
if (num_children % m_element_size_size_t)
return 0;
return num_children / m_element_size_size_t;
}
lldb::ValueObjectSP
lldb_private::formatters::LibcxxStdProxyArraySyntheticFrontEnd::GetChildAtIndex(
uint32_t idx) {
if (!m_base)
return lldb::ValueObjectSP();
uint64_t offset = idx * m_element_size_size_t;
offset = offset + m_start->GetValueAsUnsigned(0);
lldb::ValueObjectSP indirect = CreateValueObjectFromAddress(
"", offset, m_backend.GetExecutionContextRef(), m_element_type_size_t);
if (!indirect)
return lldb::ValueObjectSP();
const size_t value = indirect->GetValueAsUnsigned(0);
if (!value)
return lldb::ValueObjectSP();
offset = value * m_element_size;
offset = offset + m_base->GetValueAsUnsigned(0);
StreamString name;
name.Printf("[%" PRIu64 "] -> [%zu]", (uint64_t)idx, value);
return CreateValueObjectFromAddress(name.GetString(), offset,
m_backend.GetExecutionContextRef(),
m_element_type);
}
lldb::ChildCacheState
lldb_private::formatters::LibcxxStdProxyArraySyntheticFrontEnd::Update() {
m_base = nullptr;
m_start = nullptr;
m_finish = nullptr;
CompilerType type = m_backend.GetCompilerType();
if (type.GetNumTemplateArguments() == 0)
return ChildCacheState::eRefetch;
m_element_type = type.GetTypeTemplateArgument(0);
if (std::optional<uint64_t> size =
llvm::expectedToOptional(m_element_type.GetByteSize(nullptr)))
m_element_size = *size;
if (m_element_size == 0)
return ChildCacheState::eRefetch;
ValueObjectSP vector = m_backend.GetChildMemberWithName("__1d_");
if (!vector)
return ChildCacheState::eRefetch;
type = vector->GetCompilerType();
if (type.GetNumTemplateArguments() == 0)
return ChildCacheState::eRefetch;
m_element_type_size_t = type.GetTypeTemplateArgument(0);
if (std::optional<uint64_t> size =
llvm::expectedToOptional(m_element_type_size_t.GetByteSize(nullptr)))
m_element_size_size_t = *size;
if (m_element_size_size_t == 0)
return ChildCacheState::eRefetch;
ValueObjectSP base = m_backend.GetChildMemberWithName("__vp_");
ValueObjectSP start = vector->GetChildMemberWithName("__begin_");
ValueObjectSP finish = vector->GetChildMemberWithName("__end_");
if (!base || !start || !finish)
return ChildCacheState::eRefetch;
m_base = base.get();
m_start = start.get();
m_finish = finish.get();
return ChildCacheState::eRefetch;
}
llvm::Expected<size_t>
lldb_private::formatters::LibcxxStdProxyArraySyntheticFrontEnd::
GetIndexOfChildWithName(ConstString name) {
if (!m_base)
return llvm::createStringError("Type has no child named '%s'",
name.AsCString());
auto optional_idx = formatters::ExtractIndexFromString(name.GetCString());
if (!optional_idx) {
return llvm::createStringError("Type has no child named '%s'",
name.AsCString());
}
return *optional_idx;
}
lldb_private::SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxStdProxyArraySyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
if (!valobj_sp)
return nullptr;
return new LibcxxStdProxyArraySyntheticFrontEnd(valobj_sp);
}
|
