1//===-- DebugNamesDWARFIndex.h ---------------------------------*- 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#ifndef LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DEBUGNAMESDWARFINDEX_H
10#define LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DEBUGNAMESDWARFINDEX_H
11
12#include "Plugins/SymbolFile/DWARF/DWARFIndex.h"
13#include "Plugins/SymbolFile/DWARF/ManualDWARFIndex.h"
14#include "Plugins/SymbolFile/DWARF/SymbolFileDWARF.h"
15#include "lldb/Utility/ConstString.h"
16#include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h"
17#include <optional>
18
19namespace lldb_private::plugin {
20namespace dwarf {
21class DebugNamesDWARFIndex : public DWARFIndex {
22public:
23 static llvm::Expected<std::unique_ptr<DebugNamesDWARFIndex>>
24 Create(Module &module, DWARFDataExtractor debug_names,
25 DWARFDataExtractor debug_str, SymbolFileDWARF &dwarf);
26
27 void Preload() override { m_fallback.Preload(); }
28
29 void
30 GetGlobalVariables(ConstString basename,
31 llvm::function_ref<bool(DWARFDIE die)> callback) override;
32 void
33 GetGlobalVariables(const RegularExpression &regex,
34 llvm::function_ref<bool(DWARFDIE die)> callback) override;
35 void
36 GetGlobalVariables(DWARFUnit &cu,
37 llvm::function_ref<bool(DWARFDIE die)> callback) override;
38 void
39 GetObjCMethods(ConstString class_name,
40 llvm::function_ref<bool(DWARFDIE die)> callback) override {}
41 void GetCompleteObjCClass(
42 ConstString class_name, bool must_be_implementation,
43 llvm::function_ref<bool(DWARFDIE die)> callback) override;
44
45 /// Uses DWARF5's IDX_parent fields, when available, to speed up this query.
46 void GetFullyQualifiedType(
47 const DWARFDeclContext &context,
48 llvm::function_ref<bool(DWARFDIE die)> callback) override;
49 void GetTypes(ConstString name,
50 llvm::function_ref<bool(DWARFDIE die)> callback) override;
51 void GetTypes(const DWARFDeclContext &context,
52 llvm::function_ref<bool(DWARFDIE die)> callback) override;
53 void GetNamespaces(ConstString name,
54 llvm::function_ref<bool(DWARFDIE die)> callback) override;
55 void
56 GetTypesWithQuery(TypeQuery &query,
57 llvm::function_ref<bool(DWARFDIE die)> callback) override;
58 void GetNamespacesWithParents(
59 ConstString name, const CompilerDeclContext &parent_decl_ctx,
60 llvm::function_ref<bool(DWARFDIE die)> callback) override;
61 void GetFunctions(const Module::LookupInfo &lookup_info,
62 SymbolFileDWARF &dwarf,
63 const CompilerDeclContext &parent_decl_ctx,
64 llvm::function_ref<bool(DWARFDIE die)> callback) override;
65 void GetFunctions(const RegularExpression &regex,
66 llvm::function_ref<bool(DWARFDIE die)> callback) override;
67
68 void Dump(Stream &s) override;
69
70private:
71 DebugNamesDWARFIndex(Module &module,
72 std::unique_ptr<llvm::DWARFDebugNames> debug_names_up,
73 DWARFDataExtractor debug_names_data,
74 DWARFDataExtractor debug_str_data,
75 SymbolFileDWARF &dwarf)
76 : DWARFIndex(module), m_debug_info(dwarf.DebugInfo()),
77 m_debug_names_data(debug_names_data), m_debug_str_data(debug_str_data),
78 m_debug_names_up(std::move(debug_names_up)),
79 m_fallback(module, dwarf, GetUnits(debug_names: *m_debug_names_up),
80 GetTypeUnitSignatures(debug_names: *m_debug_names_up)) {}
81
82 DWARFDebugInfo &m_debug_info;
83
84 // LLVM DWARFDebugNames will hold a non-owning reference to this data, so keep
85 // track of the ownership here.
86 DWARFDataExtractor m_debug_names_data;
87 DWARFDataExtractor m_debug_str_data;
88
89 using DebugNames = llvm::DWARFDebugNames;
90 std::unique_ptr<DebugNames> m_debug_names_up;
91 ManualDWARFIndex m_fallback;
92
93 DWARFUnit *GetNonSkeletonUnit(const DebugNames::Entry &entry) const;
94 DWARFDIE GetDIE(const DebugNames::Entry &entry) const;
95
96 /// Checks if an entry is a foreign TU and fetch the type unit.
97 ///
98 /// This function checks if the DebugNames::Entry refers to a foreign TU and
99 /// returns an optional with a value of the \a entry is a foreign type unit
100 /// entry. A valid pointer will be returned if this entry is from a .dwo file
101 /// or if it is from a .dwp file and it matches the type unit's originating
102 /// .dwo file by verifying that the DW_TAG_type_unit DIE has a DW_AT_dwo_name
103 /// that matches the DWO name from the originating skeleton compile unit.
104 ///
105 /// \param[in] entry
106 /// The accelerator table entry to check.
107 ///
108 /// \returns
109 /// A std::optional that has a value if this entry represents a foreign type
110 /// unit. If the pointer is valid, then we were able to find and match the
111 /// entry to the type unit in the .dwo or .dwp file. The returned value can
112 /// have a valid, yet contain NULL in the following cases:
113 /// - we were not able to load the .dwo file (missing or DWO ID mismatch)
114 /// - we were able to load the .dwp file, but the type units DWO name
115 /// doesn't match the originating skeleton compile unit's entry
116 /// Returns std::nullopt if this entry is not a foreign type unit entry.
117 std::optional<DWARFTypeUnit *>
118 GetForeignTypeUnit(const DebugNames::Entry &entry) const;
119
120 bool ProcessEntry(const DebugNames::Entry &entry,
121 llvm::function_ref<bool(DWARFDIE die)> callback);
122
123 /// Returns true if `parent_entries` have identical names to `parent_names`.
124 bool SameParentChain(llvm::ArrayRef<llvm::StringRef> parent_names,
125 llvm::ArrayRef<DebugNames::Entry> parent_entries) const;
126
127 bool SameParentChain(llvm::ArrayRef<CompilerContext> parent_contexts,
128 llvm::ArrayRef<DebugNames::Entry> parent_entries) const;
129
130 /// Returns true if \a parent_contexts entries are within \a parent_chain.
131 /// This is diffferent from SameParentChain() which checks for exact match.
132 /// This function is required because \a parent_chain can contain inline
133 /// namespace entries which may not be specified in \a parent_contexts by
134 /// client.
135 ///
136 /// \param[in] parent_contexts
137 /// The list of parent contexts to check for.
138 ///
139 /// \param[in] parent_chain
140 /// The fully qualified parent chain entries from .debug_names index table
141 /// to check against.
142 ///
143 /// \returns
144 /// True if all \a parent_contexts entries are can be sequentially found
145 /// inside
146 /// \a parent_chain, otherwise False.
147 bool WithinParentChain(llvm::ArrayRef<CompilerContext> parent_contexts,
148 llvm::ArrayRef<DebugNames::Entry> parent_chain) const;
149
150 /// Returns true if .debug_names pool entry \p entry matches \p query_context.
151 bool SameAsEntryContext(const CompilerContext &query_context,
152 const DebugNames::Entry &entry) const;
153
154 llvm::SmallVector<CompilerContext>
155 GetTypeQueryParentContexts(TypeQuery &query);
156
157 static void MaybeLogLookupError(llvm::Error error,
158 const DebugNames::NameIndex &ni,
159 llvm::StringRef name);
160
161 static llvm::DenseSet<dw_offset_t> GetUnits(const DebugNames &debug_names);
162 static llvm::DenseSet<uint64_t>
163 GetTypeUnitSignatures(const DebugNames &debug_names);
164};
165
166} // namespace dwarf
167} // namespace lldb_private::plugin
168
169#endif // LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DEBUGNAMESDWARFINDEX_H
170

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source code of lldb/source/Plugins/SymbolFile/DWARF/DebugNamesDWARFIndex.h