91f4a84a15
This commit changes DebugNamesDWARFIndex so that it now overrides `GetFullyQualifiedType` and attempts to use DW_IDX_parent, when available, to speed up such queries. When this type of information is not available, the base-class implementation is used. With this commit, we now achieve the 4x speedups reported in [1]. [1]: https://discourse.llvm.org/t/rfc-improve-dwarf-5-debug-names-type-lookup-parsing-speed/74151/38
95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
//===-- DWARFDeclContext.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_DWARFDECLCONTEXT_H
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#define LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFDECLCONTEXT_H
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#include "lldb/Utility/ConstString.h"
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#include "DWARFDefines.h"
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#include <cassert>
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#include <string>
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#include <vector>
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namespace lldb_private::plugin {
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namespace dwarf {
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// DWARFDeclContext
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//
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// A class that represents a declaration context all the way down to a
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// DIE. This is useful when trying to find a DIE in one DWARF to a DIE
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// in another DWARF file.
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class DWARFDeclContext {
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public:
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struct Entry {
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Entry() = default;
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Entry(dw_tag_t t, const char *n) : tag(t), name(n) {}
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bool NameMatches(const Entry &rhs) const {
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if (name == rhs.name)
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return true;
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else if (name && rhs.name)
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return strcmp(name, rhs.name) == 0;
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return false;
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}
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// Test operator
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explicit operator bool() const { return tag != 0; }
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dw_tag_t tag = llvm::dwarf::DW_TAG_null;
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const char *name = nullptr;
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};
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DWARFDeclContext() : m_entries() {}
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DWARFDeclContext(llvm::ArrayRef<Entry> entries) {
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llvm::append_range(m_entries, entries);
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}
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void AppendDeclContext(dw_tag_t tag, const char *name) {
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m_entries.push_back(Entry(tag, name));
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}
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bool operator==(const DWARFDeclContext &rhs) const;
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bool operator!=(const DWARFDeclContext &rhs) const { return !(*this == rhs); }
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uint32_t GetSize() const { return m_entries.size(); }
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Entry &operator[](uint32_t idx) {
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assert(idx < m_entries.size() && "invalid index");
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return m_entries[idx];
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}
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const Entry &operator[](uint32_t idx) const {
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assert(idx < m_entries.size() && "invalid index");
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return m_entries[idx];
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}
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const char *GetQualifiedName() const;
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// Same as GetQualifiedName, but the life time of the returned string will
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// be that of the LLDB session.
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ConstString GetQualifiedNameAsConstString() const {
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return ConstString(GetQualifiedName());
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}
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void Clear() {
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m_entries.clear();
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m_qualified_name.clear();
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}
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protected:
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typedef std::vector<Entry> collection;
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collection m_entries;
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mutable std::string m_qualified_name;
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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_DWARFDECLCONTEXT_H
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