PrecedenceGraph.h

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/*
 * Souffle - A Datalog Compiler
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved
 * Licensed under the Universal Permissive License v 1.0 as shown at:
 * - https://opensource.org/licenses/UPL
 * - <souffle root>/licenses/SOUFFLE-UPL.txt
 */
 
/************************************************************************
 *
 * @file PrecedenceGraph.h
 *
 * Defines the class to build the precedence graph,
 * compute strongly connected components of the precedence graph, and
 * build the strongly connected component graph.
 *
 ***********************************************************************/
 
#pragma once
 
#include "GraphUtils.h"
#include "ast/Relation.h"
#include "ast/analysis/Analysis.h"
#include <string>
 
namespace souffle::ast {
 
class TranslationUnit;
 
namespace analysis {
 
/**
 * Analysis pass computing the precedence graph of the relations of the datalog progam.
 */
class PrecedenceGraphAnalysis : public Analysis {
public:
    static constexpr const char* name = "precedence-graph";
 
    PrecedenceGraphAnalysis() : Analysis(name) {}
 
    void run(const TranslationUnit& translationUnit) override;
 
    /** Output precedence graph in graphviz format to a given stream */
    void print(std::ostream& os) const override;
 
    const Graph<const Relation*, NameComparison>& graph() const {
        return backingGraph;
    }
 
private:
    /** Adjacency list of precedence graph (determined by the dependencies of the relations) */
    Graph<const Relation*, NameComparison> backingGraph;
};
 
}  // namespace analysis
}  // namespace souffle::ast