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/* Cache of styled source file text
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 SOURCE_CACHE_H
#define SOURCE_CACHE_H
#include <unordered_map>
#include <unordered_set>
/* This caches two things related to source files.
First, it caches highlighted source text, keyed by the source
file's full name. A size-limited LRU cache is used.
Highlighting depends on the GNU Source Highlight library. When not
available or when highlighting fails for some reason, this cache
will instead store the un-highlighted source text.
Second, this will cache the file offsets corresponding to the start
of each line of a source file. This cache is not size-limited. */
class source_cache
{
public:
source_cache ()
{
}
/* This returns the vector of file offsets for the symtab S,
computing the vector first if needed.
On failure, returns false.
On success, returns true and sets *OFFSETS. This pointer is not
guaranteed to remain valid across other calls to get_source_lines
or get_line_charpos. */
bool get_line_charpos (struct symtab *s,
const std::vector<off_t> **offsets);
/* Get the source text for the source file in symtab S. FIRST_LINE
and LAST_LINE are the first and last lines to return; line
numbers are 1-based. If the file cannot be read, or if the line
numbers are out of range, false is returned. Otherwise,
LINES_OUT is set to the desired text. The returned text may
include ANSI terminal escapes. */
bool get_source_lines (struct symtab *s, int first_line,
int last_line, std::string *lines_out);
/* Remove all the items from the source cache. */
void clear ()
{
m_source_map.clear ();
m_offset_cache.clear ();
}
private:
/* One element in the cache. */
struct source_text
{
/* The full name of the file. */
std::string fullname;
/* The contents of the file. */
std::string contents;
};
/* A helper function for get_source_lines reads a source file.
Returns the contents of the file; or throws an exception on
error. This also updates m_offset_cache. */
std::string get_plain_source_lines (struct symtab *s,
const std::string &fullname);
/* A helper function that the data for the given symtab is entered
into both caches. Returns false on error. */
bool ensure (struct symtab *s);
/* The contents of the source text cache. */
std::vector<source_text> m_source_map;
/* The file offset cache. The key is the full name of the source
file. */
std::unordered_map<std::string, std::vector<off_t>> m_offset_cache;
};
/* The global source cache. */
extern source_cache g_source_cache;
#endif /* SOURCE_CACHE_H */
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