| 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 | |
| 11 | #include "lldb/DataFormatters/FormattersHelpers.h" |
| 12 | #include "lldb/DataFormatters/TypeSynthetic.h" |
| 13 | #include "lldb/Utility/ConstString.h" |
| 14 | #include "lldb/ValueObject/ValueObject.h" |
| 15 | |
| 16 | #include <memory> |
| 17 | #include <vector> |
| 18 | |
| 19 | using namespace lldb; |
| 20 | using namespace lldb_private; |
| 21 | using namespace lldb_private::formatters; |
| 22 | |
| 23 | namespace { |
| 24 | |
| 25 | class LibStdcppTupleSyntheticFrontEnd : public SyntheticChildrenFrontEnd { |
| 26 | public: |
| 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 | |
| 33 | lldb::ChildCacheState Update() override; |
| 34 | |
| 35 | llvm::Expected<size_t> GetIndexOfChildWithName(ConstString name) override; |
| 36 | |
| 37 | private: |
| 38 | // The lifetime of a ValueObject and all its derivative ValueObjects |
| 39 | // (children, clones, etc.) is managed by a ClusterManager. These |
| 40 | // objects are only destroyed when every shared pointer to any of them |
| 41 | // is destroyed, so we must not store a shared pointer to any ValueObject |
| 42 | // derived from our backend ValueObject (since we're in the same cluster). |
| 43 | std::vector<ValueObject*> m_members; |
| 44 | }; |
| 45 | |
| 46 | } // end of anonymous namespace |
| 47 | |
| 48 | LibStdcppTupleSyntheticFrontEnd::LibStdcppTupleSyntheticFrontEnd( |
| 49 | lldb::ValueObjectSP valobj_sp) |
| 50 | : SyntheticChildrenFrontEnd(*valobj_sp) { |
| 51 | Update(); |
| 52 | } |
| 53 | |
| 54 | lldb::ChildCacheState LibStdcppTupleSyntheticFrontEnd::Update() { |
| 55 | m_members.clear(); |
| 56 | |
| 57 | ValueObjectSP valobj_backend_sp = m_backend.GetSP(); |
| 58 | if (!valobj_backend_sp) |
| 59 | return lldb::ChildCacheState::eRefetch; |
| 60 | |
| 61 | ValueObjectSP next_child_sp = valobj_backend_sp->GetNonSyntheticValue(); |
| 62 | while (next_child_sp != nullptr) { |
| 63 | ValueObjectSP current_child = next_child_sp; |
| 64 | next_child_sp = nullptr; |
| 65 | |
| 66 | size_t child_count = current_child->GetNumChildrenIgnoringErrors(); |
| 67 | for (size_t i = 0; i < child_count; ++i) { |
| 68 | ValueObjectSP child_sp = current_child->GetChildAtIndex(idx: i); |
| 69 | llvm::StringRef name_str = child_sp->GetName().GetStringRef(); |
| 70 | if (name_str.starts_with(Prefix: "std::_Tuple_impl<")) { |
| 71 | next_child_sp = child_sp; |
| 72 | } else if (name_str.starts_with(Prefix: "std::_Head_base<")) { |
| 73 | ValueObjectSP value_sp = |
| 74 | child_sp->GetChildMemberWithName(name: "_M_head_impl"); |
| 75 | if (value_sp) { |
| 76 | StreamString name; |
| 77 | name.Printf(format: "[%zd]", m_members.size()); |
| 78 | m_members.push_back(x: value_sp->Clone(new_name: ConstString(name.GetString())).get()); |
| 79 | } |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | return lldb::ChildCacheState::eRefetch; |
| 85 | } |
| 86 | |
| 87 | lldb::ValueObjectSP |
| 88 | LibStdcppTupleSyntheticFrontEnd::GetChildAtIndex(uint32_t idx) { |
| 89 | if (idx < m_members.size() && m_members[idx]) |
| 90 | return m_members[idx]->GetSP(); |
| 91 | return lldb::ValueObjectSP(); |
| 92 | } |
| 93 | |
| 94 | llvm::Expected<uint32_t> |
| 95 | LibStdcppTupleSyntheticFrontEnd::CalculateNumChildren() { |
| 96 | return m_members.size(); |
| 97 | } |
| 98 | |
| 99 | llvm::Expected<size_t> |
| 100 | LibStdcppTupleSyntheticFrontEnd::GetIndexOfChildWithName(ConstString name) { |
| 101 | auto optional_idx = formatters::ExtractIndexFromString(item_name: name.GetCString()); |
| 102 | if (!optional_idx) { |
| 103 | return llvm::createStringError(Fmt: "Type has no child named '%s'", |
| 104 | Vals: name.AsCString()); |
| 105 | } |
| 106 | return *optional_idx; |
| 107 | } |
| 108 | |
| 109 | SyntheticChildrenFrontEnd * |
| 110 | lldb_private::formatters::LibStdcppTupleSyntheticFrontEndCreator( |
| 111 | CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) { |
| 112 | return (valobj_sp ? new LibStdcppTupleSyntheticFrontEnd(valobj_sp) : nullptr); |
| 113 | } |
| 114 |