mirror of
https://github.com/VectorCamp/vectorscan.git
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89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
/*
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* Copyright (c) 2015-2018, Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef UE2COLLIDER_DATABASEPROXY_H
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#define UE2COLLIDER_DATABASEPROXY_H
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#include "UltimateTruth.h"
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#include <memory>
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#include <mutex>
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#include <set>
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#include <string>
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#include <boost/core/noncopyable.hpp>
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/**
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* When a compile fails for the first time, we throw this exception so that a
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* compilation error can be reported to the user. Subsequent failures will
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* simply return nullptr rather than throwing this exception.
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*/
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struct CompileFailed {
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public:
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explicit CompileFailed(const std::string &err) : error(err) {}
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std::string error;
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};
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class DatabaseProxy : boost::noncopyable {
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public:
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explicit DatabaseProxy(const std::set<unsigned> &expr_ids)
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: ids(expr_ids) {}
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explicit DatabaseProxy(std::shared_ptr<BaseDB> built_db)
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: db(built_db) {}
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std::shared_ptr<BaseDB> get(const UltimateTruth &ultimate) {
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std::lock_guard<std::mutex> lock(mutex);
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if (failed) {
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// We have previously failed to compile this database.
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return nullptr;
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}
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if (db) {
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return db;
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}
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// Database hasn't been compiled yet.
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std::string error;
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db = ultimate.compile(ids, error);
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if (!db) {
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failed = true;
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throw CompileFailed(error);
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}
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return db;
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}
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private:
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std::mutex mutex;
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std::shared_ptr<BaseDB> db;
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std::set<unsigned> ids;
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bool failed = false; // Database failed compilation.
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};
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#endif // UE2COLLIDER_DATABASEPROXY_H
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