xref: /freebsd-src/contrib/llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxxQueue.cpp (revision 0b57cec536236d46e3dba9bd041533462f33dbb7)
1 //===-- LibCxxQueue.cpp -----------------------------------------*- C++ -*-===//
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 #include "lldb/DataFormatters/FormattersHelpers.h"
11 
12 using namespace lldb;
13 using namespace lldb_private;
14 
15 namespace {
16 
17 class QueueFrontEnd : public SyntheticChildrenFrontEnd {
18 public:
19   QueueFrontEnd(ValueObject &valobj) : SyntheticChildrenFrontEnd(valobj) {
20     Update();
21   }
22 
23   size_t GetIndexOfChildWithName(ConstString name) override {
24     return m_container_sp ? m_container_sp->GetIndexOfChildWithName(name)
25                           : UINT32_MAX;
26   }
27 
28   bool MightHaveChildren() override { return true; }
29   bool Update() override;
30 
31   size_t CalculateNumChildren() override {
32     return m_container_sp ? m_container_sp->GetNumChildren() : 0;
33   }
34 
35   ValueObjectSP GetChildAtIndex(size_t idx) override {
36     return m_container_sp ? m_container_sp->GetChildAtIndex(idx, true)
37                           : nullptr;
38   }
39 
40 private:
41   ValueObjectSP m_container_sp;
42 };
43 } // namespace
44 
45 bool QueueFrontEnd::Update() {
46   m_container_sp.reset();
47   ValueObjectSP c_sp = m_backend.GetChildMemberWithName(ConstString("c"), true);
48   if (!c_sp)
49     return false;
50   m_container_sp = c_sp->GetSyntheticValue();
51   return false;
52 }
53 
54 SyntheticChildrenFrontEnd *
55 formatters::LibcxxQueueFrontEndCreator(CXXSyntheticChildren *,
56                                        lldb::ValueObjectSP valobj_sp) {
57   if (valobj_sp)
58     return new QueueFrontEnd(*valobj_sp);
59   return nullptr;
60 }
61