mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2025-01-24 12:35:55 +08:00
1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
138 lines
3.7 KiB
C++
138 lines
3.7 KiB
C++
/* Caching of GDB/DWARF index files.
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Copyright (C) 2018-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef DWARF_INDEX_CACHE_H
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#define DWARF_INDEX_CACHE_H
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#include "dwarf2/index-common.h"
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#include "gdbsupport/array-view.h"
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#include "symfile.h"
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class dwarf2_per_bfd;
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class index_cache;
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/* Base of the classes used to hold the resources of the indices loaded from
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the cache (e.g. mmapped files). */
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struct index_cache_resource
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{
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virtual ~index_cache_resource () = 0;
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};
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/* Information to be captured in the main thread, and to be used by worker
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threads during store (). */
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struct index_cache_store_context
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{
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friend class index_cache;
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index_cache_store_context (const index_cache &ic, dwarf2_per_bfd *per_bfd);
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private:
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/* Captured value of enabled (). */
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bool m_enabled;
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/* Captured value of build id. */
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std::string build_id_str;
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/* Captured value of dwz build id. */
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std::optional<std::string> dwz_build_id_str;
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};
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/* Class to manage the access to the DWARF index cache. */
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class index_cache
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{
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friend struct index_cache_store_context;
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public:
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/* Change the directory used to save/load index files. */
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void set_directory (std::string dir);
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/* Return true if the usage of the cache is enabled. */
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bool enabled () const
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{
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return m_enabled;
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}
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/* Enable the cache. */
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void enable ();
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/* Disable the cache. */
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void disable ();
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/* Store an index for the specified object file in the cache. */
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void store (dwarf2_per_bfd *per_bfd,
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const index_cache_store_context &);
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/* Look for an index file matching BUILD_ID. If found, return the contents
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as an array_view and store the underlying resources (allocated memory,
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mapped file, etc) in RESOURCE. The returned array_view is valid as long
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as RESOURCE is not destroyed.
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If no matching index file is found, return an empty array view. */
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gdb::array_view<const gdb_byte>
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lookup_gdb_index (const bfd_build_id *build_id,
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std::unique_ptr<index_cache_resource> *resource);
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/* Return the number of cache hits. */
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unsigned int n_hits () const
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{ return m_n_hits; }
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/* Record a cache hit. */
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void hit ()
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{
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if (enabled ())
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m_n_hits++;
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}
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/* Return the number of cache misses. */
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unsigned int n_misses () const
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{ return m_n_misses; }
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/* Record a cache miss. */
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void miss ()
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{
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if (enabled ())
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m_n_misses++;
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}
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private:
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/* Compute the absolute filename where the index of the objfile with build
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id BUILD_ID will be stored. SUFFIX is appended at the end of the
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filename. */
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std::string make_index_filename (const bfd_build_id *build_id,
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const char *suffix) const;
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/* The base directory where we are storing and looking up index files. */
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std::string m_dir;
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/* Whether the cache is enabled. */
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bool m_enabled = false;
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/* Number of cache hits and misses during this GDB session. */
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unsigned int m_n_hits = 0;
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unsigned int m_n_misses = 0;
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};
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/* The global instance of the index cache. */
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extern index_cache global_index_cache;
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#endif /* DWARF_INDEX_CACHE_H */
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