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https://sourceware.org/git/binutils-gdb.git
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1478fa3e48
Change all uses of gdb::unordered_map<string, T> to gdb::unordered_string_map<T> Using unordered_string_map avoids constructing a temporary std::string (possibly with dynamic allocation) when looking up values from `const char *`. I don't see any downsides to using unordered_string_map over unordered_map, even if all the lookups are done using existing std::string objects that would be built anyway. I think there are places where we could refactor the code to avoid constructing unnecessary std::string objects, but that is out of scope for this patch. There should be no change of behavior with this patch. Change-Id: Ic4df78b97f2755d5821bb66942b9e4d9a79a3dc5 Approved-by: Kevin Buettner <kevinb@redhat.com>
109 lines
3.6 KiB
C++
109 lines
3.6 KiB
C++
/* Cache of styled source file text
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Copyright (C) 2018-2026 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 GDB_SOURCE_CACHE_H
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#define GDB_SOURCE_CACHE_H
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#include "gdbsupport/unordered_map.h"
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#include "gdbsupport/unordered_set.h"
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/* This caches two things related to source files.
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First, it caches highlighted source text, keyed by the source
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file's full name. A size-limited LRU cache is used.
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Highlighting depends on the GNU Source Highlight library. When not
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available or when highlighting fails for some reason, this cache
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will instead store the un-highlighted source text.
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Second, this will cache the file offsets corresponding to the start
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of each line of a source file. This cache is not size-limited. */
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class source_cache
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{
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public:
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source_cache ()
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{
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}
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/* This returns the vector of file offsets for the symtab S,
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computing the vector first if needed.
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On failure, returns false.
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On success, returns true and sets *OFFSETS. This pointer is not
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guaranteed to remain valid across other calls to get_source_lines
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or get_line_charpos. */
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bool get_line_charpos (struct symtab *s,
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const std::vector<off_t> **offsets);
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/* Get the source text for the source file in symtab S. FIRST_LINE
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and LAST_LINE are the first and last lines to return; line
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numbers are 1-based. If the file cannot be read, or if the line
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numbers are out of range, false is returned. Otherwise,
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LINES_OUT is set to the desired text. The returned text may
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include ANSI terminal escapes. */
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bool get_source_lines (struct symtab *s, int first_line,
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int last_line, std::string *lines_out);
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/* Remove all the items from the source cache. */
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void clear ()
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{
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m_source_map.clear ();
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m_offset_cache.clear ();
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m_no_styling_files.clear ();
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}
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private:
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/* One element in the cache. */
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struct source_text
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{
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/* The full name of the file. */
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std::string fullname;
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/* The contents of the file. */
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std::string contents;
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/* True if CONTENTS are styled. Otherwise, false. */
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bool styled;
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};
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/* A helper function for get_source_lines reads a source file.
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Returns the contents of the file; or throws an exception on
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error. This also updates m_offset_cache. */
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std::string get_plain_source_lines (struct symtab *s,
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const std::string &fullname);
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/* A helper function that the data for the given symtab is entered
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into both caches. Returns false on error. */
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bool ensure (struct symtab *s);
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/* The contents of the source text cache. */
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std::vector<source_text> m_source_map;
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/* The file offset cache. The key is the full name of the source
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file. */
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gdb::unordered_string_map<std::vector<off_t>> m_offset_cache;
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/* The list of files where styling failed. */
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gdb::unordered_set<std::string> m_no_styling_files;
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};
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/* The global source cache. */
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extern source_cache g_source_cache;
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#endif /* GDB_SOURCE_CACHE_H */
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