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// Copyright (C) 2013 Google Inc.
//
// This file is part of ycmd.
//
// ycmd 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.
//
// ycmd 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 ycmd. If not, see <http://www.gnu.org/licenses/>.
#include "TranslationUnitStore.h"
#include "TranslationUnit.h"
#include "Utils.h"
#include <functional>
using std::lock_guard;
using std::shared_ptr;
using std::make_shared;
using std::mutex;
namespace YouCompleteMe {
namespace {
std::size_t HashForFlags( const std::vector< std::string > &flags ) {
// The algorithm has been taken straight from a TR1:
// "Library Extension Technical Report - Issue List" section 6.18.
// This is also the way Boost implements it.
size_t seed = 0;
for ( const auto &flag : flags ) {
seed ^= std::hash< std::string >()( flag ) + ( seed << 6 ) + ( seed >> 2 );
}
return seed;
}
} // unnamed namespace
TranslationUnitStore::TranslationUnitStore( CXIndex clang_index )
: clang_index_( clang_index ) {
}
TranslationUnitStore::~TranslationUnitStore() {
RemoveAll();
}
shared_ptr< TranslationUnit > TranslationUnitStore::GetOrCreate(
const std::string &filename,
const std::vector< UnsavedFile > &unsaved_files,
const std::vector< std::string > &flags ) {
bool dont_care;
return GetOrCreate( filename, unsaved_files, flags, dont_care );
}
shared_ptr< TranslationUnit > TranslationUnitStore::GetOrCreate(
const std::string &filename,
const std::vector< UnsavedFile > &unsaved_files,
const std::vector< std::string > &flags,
bool &translation_unit_created ) {
translation_unit_created = false;
{
lock_guard< mutex > lock( filename_to_translation_unit_and_flags_mutex_ );
shared_ptr< TranslationUnit > current_unit = GetNoLock( filename );
if ( current_unit &&
HashForFlags( flags ) == filename_to_flags_hash_[ filename ] ) {
return current_unit;
}
// We create and store an invalid, sentinel TU so that other threads don't
// try to create a TU for the same file while we are trying to create this
// TU object. When we are done creating the TU, we will overwrite this value
// with the valid object.
filename_to_translation_unit_[ filename ] =
make_shared< TranslationUnit >();
// We need to store the flags for the sentinel TU so that other threads end
// up returning the sentinel TU while the real one is being created.
filename_to_flags_hash_[ filename ] = HashForFlags( flags );
}
shared_ptr< TranslationUnit > unit;
try {
unit = make_shared< TranslationUnit >( filename,
unsaved_files,
flags,
clang_index_ );
} catch ( const ClangParseError & ) {
Remove( filename );
throw;
}
{
lock_guard< mutex > lock( filename_to_translation_unit_and_flags_mutex_ );
filename_to_translation_unit_[ filename ] = unit;
// Flags have already been stored.
}
translation_unit_created = true;
return unit;
}
shared_ptr< TranslationUnit > TranslationUnitStore::Get(
const std::string &filename ) {
lock_guard< mutex > lock( filename_to_translation_unit_and_flags_mutex_ );
return GetNoLock( filename );
}
bool TranslationUnitStore::Remove( const std::string &filename ) {
lock_guard< mutex > lock( filename_to_translation_unit_and_flags_mutex_ );
Erase( filename_to_flags_hash_, filename );
return Erase( filename_to_translation_unit_, filename );
}
void TranslationUnitStore::RemoveAll() {
lock_guard< mutex > lock( filename_to_translation_unit_and_flags_mutex_ );
filename_to_translation_unit_.clear();
filename_to_flags_hash_.clear();
}
shared_ptr< TranslationUnit > TranslationUnitStore::GetNoLock(
const std::string &filename ) {
return FindWithDefault( filename_to_translation_unit_,
filename,
shared_ptr< TranslationUnit >() );
}
} // namespace YouCompleteMe
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