3b5b814647
This patch adds support for the new foreign type unit support in .debug_names. Features include: - don't manually index foreign TUs if we have info for them - only use the type unit entries that match the .dwo files when we have a .dwp file - fix type unit lookups for .dwo files - fix crashers that happen due to PeekDIEName() using wrong offsets where an entry had DW_IDX_comp_unit and DW_IDX_type_unit entries and when we had no type unit support, it would cause us to think it was a normal DIE in .debug_info from the main executable. --------- Co-authored-by: paperchalice <liujunchang97@outlook.com>
134 lines
5.9 KiB
C++
134 lines
5.9 KiB
C++
//===-- DebugNamesDWARFIndex.h ---------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DEBUGNAMESDWARFINDEX_H
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#define LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DEBUGNAMESDWARFINDEX_H
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#include "Plugins/SymbolFile/DWARF/DWARFIndex.h"
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#include "Plugins/SymbolFile/DWARF/ManualDWARFIndex.h"
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#include "Plugins/SymbolFile/DWARF/SymbolFileDWARF.h"
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#include "lldb/Utility/ConstString.h"
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#include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h"
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#include <optional>
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namespace lldb_private::plugin {
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namespace dwarf {
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class DebugNamesDWARFIndex : public DWARFIndex {
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public:
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static llvm::Expected<std::unique_ptr<DebugNamesDWARFIndex>>
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Create(Module &module, DWARFDataExtractor debug_names,
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DWARFDataExtractor debug_str, SymbolFileDWARF &dwarf);
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void Preload() override { m_fallback.Preload(); }
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void
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GetGlobalVariables(ConstString basename,
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llvm::function_ref<bool(DWARFDIE die)> callback) override;
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void
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GetGlobalVariables(const RegularExpression ®ex,
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llvm::function_ref<bool(DWARFDIE die)> callback) override;
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void
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GetGlobalVariables(DWARFUnit &cu,
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llvm::function_ref<bool(DWARFDIE die)> callback) override;
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void
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GetObjCMethods(ConstString class_name,
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llvm::function_ref<bool(DWARFDIE die)> callback) override {}
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void GetCompleteObjCClass(
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ConstString class_name, bool must_be_implementation,
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llvm::function_ref<bool(DWARFDIE die)> callback) override;
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/// Uses DWARF5's IDX_parent fields, when available, to speed up this query.
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void GetFullyQualifiedType(
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const DWARFDeclContext &context,
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llvm::function_ref<bool(DWARFDIE die)> callback) override;
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void GetTypes(ConstString name,
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llvm::function_ref<bool(DWARFDIE die)> callback) override;
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void GetTypes(const DWARFDeclContext &context,
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llvm::function_ref<bool(DWARFDIE die)> callback) override;
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void GetNamespaces(ConstString name,
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llvm::function_ref<bool(DWARFDIE die)> callback) override;
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void GetFunctions(const Module::LookupInfo &lookup_info,
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SymbolFileDWARF &dwarf,
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const CompilerDeclContext &parent_decl_ctx,
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llvm::function_ref<bool(DWARFDIE die)> callback) override;
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void GetFunctions(const RegularExpression ®ex,
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llvm::function_ref<bool(DWARFDIE die)> callback) override;
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void Dump(Stream &s) override;
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private:
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DebugNamesDWARFIndex(Module &module,
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std::unique_ptr<llvm::DWARFDebugNames> debug_names_up,
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DWARFDataExtractor debug_names_data,
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DWARFDataExtractor debug_str_data,
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SymbolFileDWARF &dwarf)
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: DWARFIndex(module), m_debug_info(dwarf.DebugInfo()),
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m_debug_names_data(debug_names_data), m_debug_str_data(debug_str_data),
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m_debug_names_up(std::move(debug_names_up)),
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m_fallback(module, dwarf, GetUnits(*m_debug_names_up),
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GetTypeUnitSignatures(*m_debug_names_up)) {}
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DWARFDebugInfo &m_debug_info;
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// LLVM DWARFDebugNames will hold a non-owning reference to this data, so keep
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// track of the ownership here.
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DWARFDataExtractor m_debug_names_data;
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DWARFDataExtractor m_debug_str_data;
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using DebugNames = llvm::DWARFDebugNames;
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std::unique_ptr<DebugNames> m_debug_names_up;
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ManualDWARFIndex m_fallback;
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DWARFUnit *GetNonSkeletonUnit(const DebugNames::Entry &entry) const;
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DWARFDIE GetDIE(const DebugNames::Entry &entry) const;
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/// Checks if an entry is a foreign TU and fetch the type unit.
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///
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/// This function checks if the DebugNames::Entry refers to a foreign TU and
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/// returns an optional with a value of the \a entry is a foreign type unit
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/// entry. A valid pointer will be returned if this entry is from a .dwo file
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/// or if it is from a .dwp file and it matches the type unit's originating
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/// .dwo file by verifying that the DW_TAG_type_unit DIE has a DW_AT_dwo_name
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/// that matches the DWO name from the originating skeleton compile unit.
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///
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/// \param[in] entry
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/// The accelerator table entry to check.
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///
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/// \returns
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/// A std::optional that has a value if this entry represents a foreign type
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/// unit. If the pointer is valid, then we were able to find and match the
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/// entry to the type unit in the .dwo or .dwp file. The returned value can
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/// have a valid, yet contain NULL in the following cases:
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/// - we were not able to load the .dwo file (missing or DWO ID mismatch)
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/// - we were able to load the .dwp file, but the type units DWO name
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/// doesn't match the originating skeleton compile unit's entry
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/// Returns std::nullopt if this entry is not a foreign type unit entry.
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std::optional<DWARFTypeUnit *>
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GetForeignTypeUnit(const DebugNames::Entry &entry) const;
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bool ProcessEntry(const DebugNames::Entry &entry,
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llvm::function_ref<bool(DWARFDIE die)> callback);
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/// Returns true if `parent_entries` have identical names to `parent_names`.
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bool SameParentChain(llvm::ArrayRef<llvm::StringRef> parent_names,
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llvm::ArrayRef<DebugNames::Entry> parent_entries) const;
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static void MaybeLogLookupError(llvm::Error error,
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const DebugNames::NameIndex &ni,
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llvm::StringRef name);
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static llvm::DenseSet<dw_offset_t> GetUnits(const DebugNames &debug_names);
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static llvm::DenseSet<uint64_t>
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GetTypeUnitSignatures(const DebugNames &debug_names);
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};
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} // namespace dwarf
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} // namespace lldb_private::plugin
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#endif // LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DEBUGNAMESDWARFINDEX_H
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