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 | |
11 | #include "lldb/Core/ValueObject.h" |
12 | #include "lldb/DataFormatters/FormattersHelpers.h" |
13 | #include "lldb/Utility/ConstString.h" |
14 | #include <optional> |
15 | |
16 | using namespace lldb; |
17 | using namespace lldb_private; |
18 | using namespace lldb_private::formatters; |
19 | |
20 | namespace lldb_private { |
21 | namespace formatters { |
22 | class LibcxxInitializerListSyntheticFrontEnd |
23 | : public SyntheticChildrenFrontEnd { |
24 | public: |
25 | LibcxxInitializerListSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp); |
26 | |
27 | ~LibcxxInitializerListSyntheticFrontEnd() override; |
28 | |
29 | llvm::Expected<uint32_t> CalculateNumChildren() override; |
30 | |
31 | lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override; |
32 | |
33 | lldb::ChildCacheState Update() override; |
34 | |
35 | bool MightHaveChildren() override; |
36 | |
37 | size_t GetIndexOfChildWithName(ConstString name) override; |
38 | |
39 | private: |
40 | ValueObject *m_start = nullptr; |
41 | CompilerType m_element_type; |
42 | uint32_t m_element_size = 0; |
43 | size_t m_num_elements = 0; |
44 | }; |
45 | } // namespace formatters |
46 | } // namespace lldb_private |
47 | |
48 | lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd:: |
49 | LibcxxInitializerListSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp) |
50 | : SyntheticChildrenFrontEnd(*valobj_sp), m_element_type() { |
51 | if (valobj_sp) |
52 | Update(); |
53 | } |
54 | |
55 | lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd:: |
56 | ~LibcxxInitializerListSyntheticFrontEnd() { |
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 | |
62 | llvm::Expected<uint32_t> lldb_private::formatters:: |
63 | LibcxxInitializerListSyntheticFrontEnd::CalculateNumChildren() { |
64 | m_num_elements = 0; |
65 | ValueObjectSP size_sp(m_backend.GetChildMemberWithName(name: "__size_")); |
66 | if (size_sp) |
67 | m_num_elements = size_sp->GetValueAsUnsigned(fail_value: 0); |
68 | return m_num_elements; |
69 | } |
70 | |
71 | lldb::ValueObjectSP lldb_private::formatters:: |
72 | LibcxxInitializerListSyntheticFrontEnd::GetChildAtIndex(uint32_t idx) { |
73 | if (!m_start) |
74 | return lldb::ValueObjectSP(); |
75 | |
76 | uint64_t offset = idx * m_element_size; |
77 | offset = offset + m_start->GetValueAsUnsigned(fail_value: 0); |
78 | StreamString name; |
79 | name.Printf(format: "[%"PRIu64 "]", (uint64_t)idx); |
80 | return CreateValueObjectFromAddress(name: name.GetString(), address: offset, |
81 | exe_ctx: m_backend.GetExecutionContextRef(), |
82 | type: m_element_type); |
83 | } |
84 | |
85 | lldb::ChildCacheState |
86 | lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::Update() { |
87 | m_start = nullptr; |
88 | m_num_elements = 0; |
89 | m_element_type = m_backend.GetCompilerType().GetTypeTemplateArgument(idx: 0); |
90 | if (!m_element_type.IsValid()) |
91 | return lldb::ChildCacheState::eRefetch; |
92 | |
93 | if (std::optional<uint64_t> size = m_element_type.GetByteSize(exe_scope: nullptr)) { |
94 | m_element_size = *size; |
95 | // Store raw pointers or end up with a circular dependency. |
96 | m_start = m_backend.GetChildMemberWithName(name: "__begin_").get(); |
97 | } |
98 | |
99 | return lldb::ChildCacheState::eRefetch; |
100 | } |
101 | |
102 | bool lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd:: |
103 | MightHaveChildren() { |
104 | return true; |
105 | } |
106 | |
107 | size_t lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd:: |
108 | GetIndexOfChildWithName(ConstString name) { |
109 | if (!m_start) |
110 | return UINT32_MAX; |
111 | return ExtractIndexFromString(item_name: name.GetCString()); |
112 | } |
113 | |
114 | lldb_private::SyntheticChildrenFrontEnd * |
115 | lldb_private::formatters::LibcxxInitializerListSyntheticFrontEndCreator( |
116 | CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) { |
117 | return (valobj_sp ? new LibcxxInitializerListSyntheticFrontEnd(valobj_sp) |
118 | : nullptr); |
119 | } |
120 |