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LibCxxInitializerList.cpp
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1//===-- LibCxxInitializerList.cpp -----------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "LibCxx.h"
10
14#include <optional>
15
16using namespace lldb;
17using namespace lldb_private;
18using namespace lldb_private::formatters;
19
20namespace lldb_private {
21namespace formatters {
24public:
25 LibcxxInitializerListSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
26
28
29 size_t CalculateNumChildren() override;
30
31 lldb::ValueObjectSP GetChildAtIndex(size_t idx) override;
32
33 bool Update() override;
34
35 bool MightHaveChildren() override;
36
37 size_t GetIndexOfChildWithName(ConstString name) override;
38
39private:
40 ValueObject *m_start = nullptr;
43 size_t m_num_elements = 0;
44};
45} // namespace formatters
46} // namespace lldb_private
47
49 LibcxxInitializerListSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
50 : SyntheticChildrenFrontEnd(*valobj_sp), m_element_type() {
51 if (valobj_sp)
52 Update();
53}
54
57 // this needs to stay around because it's a child object who will follow its
58 // parent's life cycle
59 // delete m_start;
60}
61
64 static ConstString g_size_("__size_");
65 m_num_elements = 0;
66 ValueObjectSP size_sp(m_backend.GetChildMemberWithName(g_size_, true));
67 if (size_sp)
68 m_num_elements = size_sp->GetValueAsUnsigned(0);
69 return m_num_elements;
70}
71
72lldb::ValueObjectSP lldb_private::formatters::
74 if (!m_start)
75 return lldb::ValueObjectSP();
76
77 uint64_t offset = idx * m_element_size;
78 offset = offset + m_start->GetValueAsUnsigned(0);
79 StreamString name;
80 name.Printf("[%" PRIu64 "]", (uint64_t)idx);
81 return CreateValueObjectFromAddress(name.GetString(), offset,
82 m_backend.GetExecutionContextRef(),
83 m_element_type);
84}
85
87 Update() {
88 static ConstString g_begin_("__begin_");
89
90 m_start = nullptr;
91 m_num_elements = 0;
92 m_element_type = m_backend.GetCompilerType().GetTypeTemplateArgument(0);
93 if (!m_element_type.IsValid())
94 return false;
95
96 if (std::optional<uint64_t> size = m_element_type.GetByteSize(nullptr)) {
97 m_element_size = *size;
98 // Store raw pointers or end up with a circular dependency.
99 m_start = m_backend.GetChildMemberWithName(g_begin_, true).get();
100 }
101
102 return false;
103}
104
107 return true;
108}
109
112 if (!m_start)
113 return UINT32_MAX;
114 return ExtractIndexFromString(name.GetCString());
115}
116
119 CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
120 return (valobj_sp ? new LibcxxInitializerListSyntheticFrontEnd(valobj_sp)
121 : nullptr);
122}
Generic representation of a type in a programming language.
Definition: CompilerType.h:36
A uniqued constant string class.
Definition: ConstString.h:39
const char * GetCString() const
Get the string value as a C string.
Definition: ConstString.h:215
llvm::StringRef GetString() const
size_t Printf(const char *format,...) __attribute__((format(printf
Output printf formatted output to the stream.
Definition: Stream.cpp:107
#define UINT32_MAX
Definition: lldb-defines.h:19
size_t ExtractIndexFromString(const char *item_name)
SyntheticChildrenFrontEnd * LibcxxInitializerListSyntheticFrontEndCreator(CXXSyntheticChildren *, lldb::ValueObjectSP)
A class that represents a running process on the host machine.
Definition: SBAddress.h:15