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LibStdcppTuple.cpp
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1//===-- LibStdcppTuple.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 "LibStdcpp.h"
10
15
16#include <memory>
17#include <vector>
18
19using namespace lldb;
20using namespace lldb_private;
21using namespace lldb_private::formatters;
22
23namespace {
24
25class LibStdcppTupleSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
26public:
27 explicit LibStdcppTupleSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp);
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 // The lifetime of a ValueObject and all its derivative ValueObjects
41 // (children, clones, etc.) is managed by a ClusterManager. These
42 // objects are only destroyed when every shared pointer to any of them
43 // is destroyed, so we must not store a shared pointer to any ValueObject
44 // derived from our backend ValueObject (since we're in the same cluster).
45 std::vector<ValueObject*> m_members;
46};
47
48} // end of anonymous namespace
49
50LibStdcppTupleSyntheticFrontEnd::LibStdcppTupleSyntheticFrontEnd(
51 lldb::ValueObjectSP valobj_sp)
52 : SyntheticChildrenFrontEnd(*valobj_sp) {
53 Update();
54}
55
56lldb::ChildCacheState LibStdcppTupleSyntheticFrontEnd::Update() {
57 m_members.clear();
58
59 ValueObjectSP valobj_backend_sp = m_backend.GetSP();
60 if (!valobj_backend_sp)
62
63 ValueObjectSP next_child_sp = valobj_backend_sp->GetNonSyntheticValue();
64 while (next_child_sp != nullptr) {
65 ValueObjectSP current_child = next_child_sp;
66 next_child_sp = nullptr;
67
68 size_t child_count = current_child->GetNumChildrenIgnoringErrors();
69 for (size_t i = 0; i < child_count; ++i) {
70 ValueObjectSP child_sp = current_child->GetChildAtIndex(i);
71 llvm::StringRef name_str = child_sp->GetName().GetStringRef();
72 if (name_str.starts_with("std::_Tuple_impl<")) {
73 next_child_sp = child_sp;
74 } else if (name_str.starts_with("std::_Head_base<")) {
75 ValueObjectSP value_sp =
76 child_sp->GetChildMemberWithName("_M_head_impl");
77 if (value_sp) {
78 StreamString name;
79 name.Printf("[%zd]", m_members.size());
80 m_members.push_back(value_sp->Clone(ConstString(name.GetString())).get());
81 }
82 }
83 }
84 }
85
87}
88
89bool LibStdcppTupleSyntheticFrontEnd::MightHaveChildren() { return true; }
90
92LibStdcppTupleSyntheticFrontEnd::GetChildAtIndex(uint32_t idx) {
93 if (idx < m_members.size() && m_members[idx])
94 return m_members[idx]->GetSP();
95 return lldb::ValueObjectSP();
96}
97
98llvm::Expected<uint32_t>
99LibStdcppTupleSyntheticFrontEnd::CalculateNumChildren() {
100 return m_members.size();
101}
102
103size_t LibStdcppTupleSyntheticFrontEnd::GetIndexOfChildWithName(
104 ConstString name) {
105 return ExtractIndexFromString(name.GetCString());
106}
107
111 return (valobj_sp ? new LibStdcppTupleSyntheticFrontEnd(valobj_sp) : nullptr);
112}
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
virtual lldb::ValueObjectSP GetChildAtIndex(uint32_t idx)=0
virtual lldb::ChildCacheState Update()=0
This function is assumed to always succeed and if it fails, the front-end should know to deal with it...
virtual size_t GetIndexOfChildWithName(ConstString name)=0
virtual llvm::Expected< uint32_t > CalculateNumChildren()=0
SyntheticChildrenFrontEnd * LibStdcppTupleSyntheticFrontEndCreator(CXXSyntheticChildren *, lldb::ValueObjectSP)
size_t ExtractIndexFromString(const char *item_name)
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:479