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
|
//===-- LibCxxSliceArray.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/Core/ValueObject.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
#include <optional>
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
namespace lldb_private {
namespace formatters {
bool LibcxxStdSliceArraySummaryProvider(ValueObject &valobj, Stream &stream,
const TypeSummaryOptions &options) {
ValueObjectSP obj = valobj.GetNonSyntheticValue();
if (!obj)
return false;
ValueObjectSP ptr_sp = obj->GetChildMemberWithName("__size_");
if (!ptr_sp)
return false;
const size_t size = ptr_sp->GetValueAsUnsigned(0);
ptr_sp = obj->GetChildMemberWithName("__stride_");
if (!ptr_sp)
return false;
const size_t stride = ptr_sp->GetValueAsUnsigned(0);
stream.Printf("stride=%zu size=%zu", stride, size);
return true;
}
/// Data formatter for libc++'s std::slice_array.
///
/// A slice_array is created by using:
/// operator[](std::slice slicearr);
/// and std::slice is created by:
/// slice(std::size_t start, std::size_t size, std::size_t stride);
/// The std::slice_array has the following members:
/// - __vp_ points to std::valarray::__begin_ + @a start
/// - __size_ is @a size
/// - __stride_is @a stride
class LibcxxStdSliceArraySyntheticFrontEnd : public SyntheticChildrenFrontEnd {
public:
LibcxxStdSliceArraySyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
~LibcxxStdSliceArraySyntheticFrontEnd() override;
llvm::Expected<uint32_t> CalculateNumChildren() override;
lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override;
lldb::ChildCacheState Update() override;
bool MightHaveChildren() override;
size_t GetIndexOfChildWithName(ConstString name) override;
private:
/// A non-owning pointer to slice_array.__vp_.
ValueObject *m_start = nullptr;
/// slice_array.__size_.
size_t m_size = 0;
/// slice_array.__stride_.
size_t m_stride = 0;
/// The type of slice_array's template argument T.
CompilerType m_element_type;
/// The sizeof slice_array's template argument T.
uint32_t m_element_size = 0;
};
} // namespace formatters
} // namespace lldb_private
lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEnd::
LibcxxStdSliceArraySyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp), m_element_type() {
if (valobj_sp)
Update();
}
lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEnd::
~LibcxxStdSliceArraySyntheticFrontEnd() {
// these need to stay around because they are child objects who will follow
// their parent's life cycle
// delete m_start;
}
llvm::Expected<uint32_t> lldb_private::formatters::
LibcxxStdSliceArraySyntheticFrontEnd::CalculateNumChildren() {
return m_size;
}
lldb::ValueObjectSP
lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEnd::GetChildAtIndex(
uint32_t idx) {
if (!m_start)
return lldb::ValueObjectSP();
uint64_t offset = idx * m_stride * m_element_size;
offset = offset + m_start->GetValueAsUnsigned(0);
StreamString name;
name.Printf("[%" PRIu64 "]", (uint64_t)idx);
return CreateValueObjectFromAddress(name.GetString(), offset,
m_backend.GetExecutionContextRef(),
m_element_type);
}
lldb::ChildCacheState
lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEnd::Update() {
m_start = 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 = m_element_type.GetByteSize(nullptr))
m_element_size = *size;
if (m_element_size == 0)
return ChildCacheState::eRefetch;
ValueObjectSP start = m_backend.GetChildMemberWithName("__vp_");
ValueObjectSP size = m_backend.GetChildMemberWithName("__size_");
ValueObjectSP stride = m_backend.GetChildMemberWithName("__stride_");
if (!start || !size || !stride)
return ChildCacheState::eRefetch;
m_start = start.get();
m_size = size->GetValueAsUnsigned(0);
m_stride = stride->GetValueAsUnsigned(0);
return ChildCacheState::eRefetch;
}
bool lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEnd::
MightHaveChildren() {
return true;
}
size_t lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEnd::
GetIndexOfChildWithName(ConstString name) {
if (!m_start)
return std::numeric_limits<size_t>::max();
return ExtractIndexFromString(name.GetCString());
}
lldb_private::SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxStdSliceArraySyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
if (!valobj_sp)
return nullptr;
return new LibcxxStdSliceArraySyntheticFrontEnd(valobj_sp);
}
|
