LLDB mainline
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:
26
28
29 llvm::Expected<uint32_t> CalculateNumChildren() override;
30
31 lldb::ValueObjectSP GetChildAtIndex(uint32_t idx) override;
32
34
35 bool MightHaveChildren() override;
36
37 size_t GetIndexOfChildWithName(ConstString name) override;
38
39private:
40 ValueObject *m_start = nullptr;
42 uint32_t m_element_size = 0;
43 size_t m_num_elements = 0;
44};
45} // namespace formatters
46} // namespace lldb_private
47
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
62llvm::Expected<uint32_t> lldb_private::formatters::
64 m_num_elements = 0;
65 ValueObjectSP size_sp(m_backend.GetChildMemberWithName("__size_"));
66 if (size_sp)
67 m_num_elements = size_sp->GetValueAsUnsigned(0);
68 return m_num_elements;
69}
70
73 if (!m_start)
74 return lldb::ValueObjectSP();
75
76 uint64_t offset = idx * m_element_size;
77 offset = offset + m_start->GetValueAsUnsigned(0);
78 StreamString name;
79 name.Printf("[%" PRIu64 "]", (uint64_t)idx);
80 return CreateValueObjectFromAddress(name.GetString(), offset,
81 m_backend.GetExecutionContextRef(),
82 m_element_type);
83}
84
87 m_start = nullptr;
88 m_num_elements = 0;
89 m_element_type = m_backend.GetCompilerType().GetTypeTemplateArgument(0);
90 if (!m_element_type.IsValid())
92
93 if (std::optional<uint64_t> size = m_element_type.GetByteSize(nullptr)) {
94 m_element_size = *size;
95 // Store raw pointers or end up with a circular dependency.
96 m_start = m_backend.GetChildMemberWithName("__begin_").get();
97 }
98
100}
101
104 return true;
105}
106
109 if (!m_start)
110 return UINT32_MAX;
111 return ExtractIndexFromString(name.GetCString());
112}
113
117 return (valobj_sp ? new LibcxxInitializerListSyntheticFrontEnd(valobj_sp)
118 : nullptr);
119}
Generic representation of a type in a programming language.
Definition: CompilerType.h:36
A uniqued constant string class.
Definition: ConstString.h:40
const char * GetCString() const
Get the string value as a C string.
Definition: ConstString.h:216
llvm::StringRef GetString() const
size_t Printf(const char *format,...) __attribute__((format(printf
Output printf formatted output to the stream.
Definition: Stream.cpp:134
lldb::ChildCacheState Update() override
This function is assumed to always succeed and if it fails, the front-end should know to deal with it...
#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
ChildCacheState
Specifies if children need to be re-computed after a call to SyntheticChildrenFrontEnd::Update.
@ eRefetch
Children need to be recomputed dynamically.
std::shared_ptr< lldb_private::ValueObject > ValueObjectSP
Definition: lldb-forward.h:478