a2154b1951
This patch add the ability to cache the manual DWARF indexing results to disk for faster subsequent debug sessions. Manual DWARF indexing is time consuming and causes all DWARF to be fully parsed and indexed each time you debug a binary that doesn't have an acceptable accelerator table. Acceptable accelerator tables include .debug_names in DWARF5 or Apple accelerator tables. This patch breaks up testing by testing all of the encoding and decoding of required C++ objects in a gtest unit test, and then has a test to verify the debug info cache is generated correctly. This patch also adds the ability to track when a symbol table or DWARF index is loaded or saved to the cache in the "statistics dump" command. This is essential to know in statistics as it can help explain why a debug session was slower or faster than expected. Reviewed By: labath, wallace Differential Revision: https://reviews.llvm.org/D115951
94 lines
3.0 KiB
C++
94 lines
3.0 KiB
C++
//===-- NameToDIE.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_NAMETODIE_H
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#define LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_NAMETODIE_H
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#include <functional>
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#include "DIERef.h"
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#include "lldb/Core/UniqueCStringMap.h"
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#include "lldb/Core/dwarf.h"
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#include "lldb/lldb-defines.h"
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class DWARFUnit;
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class NameToDIE {
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public:
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NameToDIE() : m_map() {}
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~NameToDIE() = default;
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void Dump(lldb_private::Stream *s);
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void Insert(lldb_private::ConstString name, const DIERef &die_ref);
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void Append(const NameToDIE &other);
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void Finalize();
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bool Find(lldb_private::ConstString name,
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llvm::function_ref<bool(DIERef ref)> callback) const;
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bool Find(const lldb_private::RegularExpression ®ex,
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llvm::function_ref<bool(DIERef ref)> callback) const;
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/// \a unit must be the skeleton unit if possible, not GetNonSkeletonUnit().
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void
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FindAllEntriesForUnit(DWARFUnit &unit,
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llvm::function_ref<bool(DIERef ref)> callback) const;
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void
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ForEach(std::function<bool(lldb_private::ConstString name,
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const DIERef &die_ref)> const
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&callback) const;
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/// Decode a serialized version of this object from data.
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///
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/// \param data
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/// The decoder object that references the serialized data.
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///
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/// \param offset_ptr
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/// A pointer that contains the offset from which the data will be decoded
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/// from that gets updated as data gets decoded.
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///
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/// \param strtab
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/// All strings in cache files are put into string tables for efficiency
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/// and cache file size reduction. Strings are stored as uint32_t string
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/// table offsets in the cache data.
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bool Decode(const lldb_private::DataExtractor &data,
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lldb::offset_t *offset_ptr,
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const lldb_private::StringTableReader &strtab);
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/// Encode this object into a data encoder object.
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///
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/// This allows this object to be serialized to disk.
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///
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/// \param encoder
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/// A data encoder object that serialized bytes will be encoded into.
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///
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/// \param strtab
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/// All strings in cache files are put into string tables for efficiency
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/// and cache file size reduction. Strings are stored as uint32_t string
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/// table offsets in the cache data.
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void Encode(lldb_private::DataEncoder &encoder,
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lldb_private::ConstStringTable &strtab) const;
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/// Used for unit testing the encoding and decoding.
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bool operator==(const NameToDIE &rhs) const;
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bool IsEmpty() const { return m_map.IsEmpty(); }
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void Clear() { m_map.Clear(); }
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protected:
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lldb_private::UniqueCStringMap<DIERef> m_map;
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};
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#endif // LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_NAMETODIE_H
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