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LibCxxQueue.cpp
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1 //===-- LibCxxQueue.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"
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  // The lifetime of a ValueObject and all its derivative ValueObjects
42  // (children, clones, etc.) is managed by a ClusterManager. These
43  // objects are only destroyed when every shared pointer to any of them
44  // is destroyed, so we must not store a shared pointer to any ValueObject
45  // derived from our backend ValueObject (since we're in the same cluster).
46  ValueObject* m_container_sp = nullptr;
47 };
48 } // namespace
49 
50 bool QueueFrontEnd::Update() {
51  m_container_sp = nullptr;
52  ValueObjectSP c_sp = m_backend.GetChildMemberWithName(ConstString("c"), true);
53  if (!c_sp)
54  return false;
55  m_container_sp = c_sp->GetSyntheticValue().get();
56  return false;
57 }
58 
61  lldb::ValueObjectSP valobj_sp) {
62  if (valobj_sp)
63  return new QueueFrontEnd(*valobj_sp);
64  return nullptr;
65 }
A class that represents a running process on the host machine.
virtual lldb::ValueObjectSP GetChildMemberWithName(ConstString name, bool can_create)
#define UINT32_MAX
Definition: lldb-defines.h:31
static size_t CalculateNumChildren(CompilerType container_type, CompilerType element_type, lldb_private::ExecutionContextScope *exe_scope=nullptr)
Definition: VectorType.cpp:169
A uniqued constant string class.
Definition: ConstString.h:40
Definition: SBAddress.h:15
SyntheticChildrenFrontEnd * LibcxxQueueFrontEndCreator(CXXSyntheticChildren *, lldb::ValueObjectSP)
Definition: LibCxxQueue.cpp:60