976ca31673
While doing the psymtab-sharing patchset, I avoided renaming variables unnecessarily to avoid adding noise to patches, but I'd like to do it now. Basically, we have these dwarf2 per-something structures: - dwarf2_per_objfile - dwarf2_per_bfd - dwarf2_per_cu_data I named the instances of dwarf2_per_bfd `per_bfd` and most of instances of dwarf2_per_cu_data are called `per_cu`. Most pre-existing instances of dwarf2_per_objfile are named `dwarf2_per_objfile`. For consistency with the other type, I'd like to rename them to just `per_objfile`. The `dwarf2_` prefix is superfluous, since it's already clear we are in dwarf2 code. It also helps reducing the line wrapping by saving 7 precious columns. gdb/ChangeLog: * dwarf2/comp-unit.c, dwarf2/comp-unit.h, dwarf2/index-cache.c, dwarf2/index-cache.h, dwarf2/index-write.c, dwarf2/index-write.h, dwarf2/line-header.c, dwarf2/line-header.h, dwarf2/macro.c, dwarf2/macro.h, dwarf2/read.c, dwarf2/read.h: Rename struct dwarf2_per_objfile variables and fields from `dwarf2_per_objfile` to just `per_objfile` throughout. Change-Id: I3c45cdcc561265e90df82cbd36b4b4ef2fa73aef
113 lines
3.1 KiB
C++
113 lines
3.1 KiB
C++
/* Caching of GDB/DWARF index files.
|
|
|
|
Copyright (C) 2018-2020 Free Software Foundation, Inc.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef DWARF_INDEX_CACHE_H
|
|
#define DWARF_INDEX_CACHE_H
|
|
|
|
#include "dwarf2/index-common.h"
|
|
#include "gdbsupport/array-view.h"
|
|
#include "symfile.h"
|
|
|
|
/* Base of the classes used to hold the resources of the indices loaded from
|
|
the cache (e.g. mmapped files). */
|
|
|
|
struct index_cache_resource
|
|
{
|
|
virtual ~index_cache_resource () = 0;
|
|
};
|
|
|
|
/* Class to manage the access to the DWARF index cache. */
|
|
|
|
class index_cache
|
|
{
|
|
public:
|
|
/* Change the directory used to save/load index files. */
|
|
void set_directory (std::string dir);
|
|
|
|
/* Return true if the usage of the cache is enabled. */
|
|
bool enabled () const
|
|
{
|
|
return m_enabled;
|
|
}
|
|
|
|
/* Enable the cache. */
|
|
void enable ();
|
|
|
|
/* Disable the cache. */
|
|
void disable ();
|
|
|
|
/* Store an index for the specified object file in the cache. */
|
|
void store (dwarf2_per_objfile *per_objfile);
|
|
|
|
/* Look for an index file matching BUILD_ID. If found, return the contents
|
|
as an array_view and store the underlying resources (allocated memory,
|
|
mapped file, etc) in RESOURCE. The returned array_view is valid as long
|
|
as RESOURCE is not destroyed.
|
|
|
|
If no matching index file is found, return an empty array view. */
|
|
gdb::array_view<const gdb_byte>
|
|
lookup_gdb_index (const bfd_build_id *build_id,
|
|
std::unique_ptr<index_cache_resource> *resource);
|
|
|
|
/* Return the number of cache hits. */
|
|
unsigned int n_hits () const
|
|
{ return m_n_hits; }
|
|
|
|
/* Record a cache hit. */
|
|
void hit ()
|
|
{
|
|
if (enabled ())
|
|
m_n_hits++;
|
|
}
|
|
|
|
/* Return the number of cache misses. */
|
|
unsigned int n_misses () const
|
|
{ return m_n_misses; }
|
|
|
|
/* Record a cache miss. */
|
|
void miss ()
|
|
{
|
|
if (enabled ())
|
|
m_n_misses++;
|
|
}
|
|
|
|
private:
|
|
|
|
/* Compute the absolute filename where the index of the objfile with build
|
|
id BUILD_ID will be stored. SUFFIX is appended at the end of the
|
|
filename. */
|
|
std::string make_index_filename (const bfd_build_id *build_id,
|
|
const char *suffix) const;
|
|
|
|
/* The base directory where we are storing and looking up index files. */
|
|
std::string m_dir;
|
|
|
|
/* Whether the cache is enabled. */
|
|
bool m_enabled = false;
|
|
|
|
/* Number of cache hits and misses during this GDB session. */
|
|
unsigned int m_n_hits = 0;
|
|
unsigned int m_n_misses = 0;
|
|
};
|
|
|
|
/* The global instance of the index cache. */
|
|
extern index_cache global_index_cache;
|
|
|
|
#endif /* DWARF_INDEX_CACHE_H */
|