source: src/Common/DeclStats.cpp @ 5007618

//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// DeclStats.cpp -- Print statistics about a translation unit's declarations.
//
// Author           : Andrew Beach
// Created On       : Fri Oct  1 14:26:00 2021
// Last Modified By : Andrew Beach
// Last Modified On : Wed Oct  8 11:24:00 2021
// Update Count     : 0
//

#include "DeclStats.hpp"

#include "AST/LinkageSpec.hpp"
#include "AST/Pass.hpp"
#include "AST/Print.hpp"
#include "Common/VectorMap.h"

#include <iostream>
#include <map>
#include <sstream>
#include <unordered_map>
#include <unordered_set>

// Everything but printDeclStats at the bottom is hidden.
namespace {

template<typename T>
void sum( T & l, const T & r ) { l += r; }

void sum( VectorMap<unsigned> & l, const VectorMap<unsigned> & r ) {
        l.reserve( r.size() );
        for ( unsigned i = 0 ; i < r.size() ; ++i ) {
                l[i] += r[i];
        }
}

template<typename KeyT>
void sum( std::map<KeyT, unsigned> & l, const std::map<KeyT, unsigned> & r ) {
        for ( const auto & entry : r ) {
                l[ entry.first ] += entry.second;
        }
}

template<typename KeyT>
void sum( std::unordered_map<KeyT, unsigned> & l,
                const std::unordered_map<KeyT, unsigned> & r ) {
        for ( const auto & entry : r ) {
                l[ entry.first ] += entry.second;
        }
}

/// Stores statistics on a single group of arguments or return values.
struct ArgPackStats {
        /// Count of decls with each number of elements.
        VectorMap<unsigned> n;
        /// Count of decls with each number of basic type elements.
        VectorMap<unsigned> n_basic;
        /// Count of decls with each number of generic type elements.
        VectorMap<unsigned> n_generic;
        /// Count of decls with each number of polymorphic elements.
        VectorMap<unsigned> n_poly;
        /// Count of decls with each number of non-generic compound types.
        VectorMap<unsigned> n_compound;
        /// Count of decls with each percentage of basic type elements.
        std::map<unsigned, unsigned> p_basic;
        /// Count of decls with each percentage of generic type elements.
        std::map<unsigned, unsigned> p_generic;
        /// Count of decls with each percentage of polymorphic elements.
        std::map<unsigned, unsigned> p_poly;
        /// Count of decls with each percentage of non-generic compound type elements.
        std::map<unsigned, unsigned> p_compound;
        /// Count of decls with each number of distinct types in the pack.
        VectorMap<unsigned> n_types;
        /// Count of decls with each percentage of new types in lists.
        /// Types used in the parameter list that recur in the return list are not considered to be new.
        std::map<unsigned, unsigned> p_new;

        ArgPackStats& operator+=( const ArgPackStats& other ) {
                sum(n, other.n);
                sum(n_basic, other.n_basic);
                sum(n_generic, other.n_generic);
                sum(n_poly, other.n_poly);
                sum(n_compound, other.n_compound);
                sum(p_basic, other.p_basic);
                sum(p_generic, other.p_generic);
                sum(p_poly, other.p_poly);
                sum(p_compound, other.p_compound);
                sum(n_types, other.n_types);
                sum(p_new, other.p_new);

                return *this;
        }
};

/// Collected statistics on a group of declarations.
struct Stats {
        /// Total number of declarations in these statistics.
        unsigned n_decls;
        /// Count of declarations with each number of assertion parameters.
        VectorMap<unsigned> n_type_params;
        /// Count of generic types with each number of type parameters.
        VectorMap<unsigned> n_generic_params;
        /// Count of maximum nesting depth of types.
        VectorMap<unsigned> n_generic_nesting;
        /// Count of declarations with each name.
        std::unordered_map<std::string, unsigned> by_name;
        /// Count of uses of each basic type.
        std::unordered_map<std::string, unsigned> basic_type_names;
        /// Count of uses of each generic type name (includes "*", "[]", "(*)", "[,]").
        std::unordered_map<std::string, unsigned> generic_type_names;
        /// Count of uses of each non-generic aggregate type.
        std::unordered_map<std::string, unsigned> compound_type_names;
        /// Count of decls using each basic type.
        std::unordered_map<std::string, unsigned> basic_type_decls;
        /// Count of decls using each generic type (includes "*", "[]", "(*)", "[,]").
        std::unordered_map<std::string, unsigned> generic_type_decls;
        /// Count of decls using each compound type.
        std::unordered_map<std::string, unsigned> compound_type_decls;
        /// Stats for the parameter lists.
        ArgPackStats params;
        /// Stats for the return lists.
        ArgPackStats returns;

        /// Count of declarations with each number of assertions.
        std::map<unsigned, unsigned> n_assns;
        /// Stats for the assertions' parameters.
        ArgPackStats assn_params;
        /// Stats for the assertions' return types.
        ArgPackStats assn_returns;

        Stats& operator+=( const Stats& other ) {
                sum( n_decls, other.n_decls );
                sum( n_type_params, other.n_type_params );
                sum( n_generic_params, other.n_generic_params );
                sum( n_generic_nesting, other.n_generic_nesting );
                sum( by_name, other.by_name );
                sum( basic_type_names, other.basic_type_names );
                sum( generic_type_names, other.generic_type_names );
                sum( compound_type_names, other.compound_type_names );
                sum( basic_type_decls, other.basic_type_decls );
                sum( generic_type_decls, other.generic_type_decls );
                sum( compound_type_decls, other.compound_type_decls );
                sum( params, other.params );
                sum( returns, other.returns );
                sum( n_assns, other.n_assns );
                sum( assn_params, other.assn_params );
                sum( assn_returns, other.assn_returns );

                return *this;
        }

};

void update_max( unsigned & max, unsigned value ) {
        if ( max < value ) max = value;
}

// Where all unnamed specs are counted as one named spec group.
constexpr unsigned num_named_specs = 8;

unsigned linkage_index( ast::Linkage::Spec spec ) {
        switch ( spec.val ) {
        case ast::Linkage::Intrinsic.val:  return 0;
        case ast::Linkage::C.val:          return 1;
        case ast::Linkage::Cforall.val:    return 2;
        case ast::Linkage::AutoGen.val:    return 3;
        case ast::Linkage::Compiler.val:   return 4;
        case ast::Linkage::BuiltinCFA.val: return 5;
        case ast::Linkage::BuiltinC.val:   return 6;
        default:                           return 7;
        }
}

struct DeclStats : public ast::WithShortCircuiting {
        /// Stores separate stats per linkage.
        Stats by_linkage[num_named_specs];
        /// Stores manglenames already seen to avoid double-counting.
        std::unordered_set<std::string> seen_names;
        /// Overall stats.
        Stats total;
        /// Count of expressions with (depth, fanout)
        std::map<std::pair<unsigned, unsigned>, unsigned> exprs_by_fanout_at_depth;

        /// Count that we have seen a named type.
        void countType(
                        const std::string & name, unsigned & n,
                        std::unordered_map<std::string, unsigned> & names,
                        std::unordered_map<std::string, unsigned> & decls,
                        std::unordered_set<std::string> & elSeen ) {
                ++n;
                ++names[ name ];
                if ( elSeen.insert( name ).second ) {
                        ++decls[ name ];
                }
        }

        /// Perform type analysis on a subtype.
        void analyzeSubtype( const ast::Type * type, Stats & stats,
                        std::unordered_set<std::string> & elSeen, unsigned & n_poly,
                        bool & seen_poly, unsigned & max_depth, unsigned depth ) {
                // This kind of gets in the way of grouping arguments.
                unsigned ignored = 0;
                analyzeType(
                        type, stats, elSeen, ignored, ignored, n_poly, ignored,
                        seen_poly, max_depth, depth + 1 );
        }

        /// Perform type analysis on each subtype.
        void analyzeSubtypes(
                        const std::vector<ast::ptr<ast::Type>> & types, Stats & stats,
                        std::unordered_set<std::string> & elSeen, unsigned & n_poly,
                        bool & seen_poly, unsigned & max_depth, unsigned depth ) {
                for ( const auto & type : types ) {
                        analyzeSubtype( type, stats, elSeen, n_poly, seen_poly, max_depth, depth );
                }
        }

        /// Perform sub-type analysis on each subtype in an argument pack.
        void analyzeSubPack(
                        const std::vector<ast::ptr<ast::Type>> & types, Stats & stats,
                        std::unordered_set<std::string> & elSeen, unsigned & n_poly,
                        bool & seen_poly, unsigned & max_depth, unsigned depth,
                        unsigned & n_subs ) {
                // ... and count voids?
                for ( const auto & type : types ) {
                        if ( type.as<ast::VoidType>() ) {
                                ++n_subs;
                        }
                        // Could this be in `else`?
                        analyzeSubtype( type, stats, elSeen, n_poly, seen_poly, max_depth, depth );
                }
        }

        /// Analyze and gather stats from a single type.
        void analyzeType( const ast::ptr<ast::Type> & type, Stats & stats,
                        std::unordered_set<std::string> & elSeen,
                        unsigned & n_basic, unsigned & n_generic, unsigned & n_poly,
                        unsigned & n_agg, bool & seen_poly,
                        unsigned & max_depth, unsigned depth ) {
                // Almost a visit, except it is only types.
                if ( const ast::BasicType * t = type.as<ast::BasicType>() ) {
                        const std::string name = ast::BasicType::typeNames[ t->kind ];
                        countType( name, n_basic, stats.basic_type_names, stats.basic_type_decls, elSeen );
                        update_max( max_depth, depth );
                } else if ( auto t = type.as<ast::PointerType>() ) {
                        static const std::string name = "*";
                        countType( name, n_generic, stats.generic_type_names, stats.generic_type_decls, elSeen );
                        analyzeSubtype( t->base, stats, elSeen, n_poly, seen_poly, max_depth, depth );
                        ++stats.n_generic_params.at( 1 );
                } else if ( auto t = type.as<ast::ArrayType>() ) {
                        static const std::string name = "[]";
                        countType( name, n_generic, stats.generic_type_names, stats.generic_type_decls, elSeen );
                        analyzeSubtype( t->base, stats, elSeen, n_poly, seen_poly, max_depth, depth );
                        ++stats.n_generic_params.at( 1 );
                } else if ( auto t = type.as<ast::ReferenceType>() ) {
                        static const std::string name = "&";
                        countType( name, n_generic, stats.generic_type_names, stats.generic_type_decls, elSeen );
                        analyzeSubtype( t->base, stats, elSeen, n_poly, seen_poly, max_depth, depth );
                        ++stats.n_generic_params.at( 1 );
                } else if ( auto t = type.as<ast::FunctionType>() ) {
                        static const std::string name = "(*)";
                        countType( name, n_generic, stats.generic_type_names, stats.generic_type_decls, elSeen );
                        unsigned n_subs = 0;
                        analyzeSubPack( t->returns, stats, elSeen, n_poly, seen_poly, max_depth, depth, n_subs );
                        analyzeSubPack( t->params, stats, elSeen, n_poly, seen_poly, max_depth, depth, n_subs );
                        ++stats.n_generic_params.at( n_subs );
                } else if ( auto t = type.as<ast::TypeInstType>() ) {
                        if ( !seen_poly ) {
                                ++n_poly;
                                seen_poly = true;
                        }
                        countType( t->name, n_agg, stats.compound_type_names,
                                        stats.compound_type_decls, elSeen );
                        update_max( max_depth, depth );
                } else if ( auto t = type.as<ast::BaseInstType>() ) {
                        auto & params = t->params;
                        if ( params.empty() ) {
                                countType( t->name, n_agg, stats.compound_type_names,
                                                stats.compound_type_decls, elSeen );
                                update_max( max_depth, depth );
                        } else {
                                countType( t->name, n_generic, stats.generic_type_names,
                                                stats.generic_type_decls, elSeen );
                                ++stats.n_generic_params.at( params.size() );
                        }
                } else if ( auto t = type.as<ast::TupleType>() ) {
                        static const std::string name = "[,]";
                        countType( name, n_generic, stats.generic_type_names, stats.generic_type_decls, elSeen);
                        analyzeSubtypes( t->types, stats, elSeen, n_poly, seen_poly, max_depth, depth );
                        ++stats.n_generic_params.at( t->size() );
                } else if ( type.as<ast::VarArgsType>() ) {
                        static const std::string name = "...";
                        countType( name, n_agg, stats.compound_type_names, stats.compound_type_decls, elSeen );
                        update_max( max_depth, depth );
                } else if ( type.as<ast::ZeroType>() ) {
                        static const std::string name = "0";
                        countType( name, n_basic, stats.basic_type_names, stats.basic_type_decls, elSeen );
                        update_max( max_depth, depth );
                } else if ( type.as<ast::OneType>() ) {
                        static const std::string name = "1";
                        countType( name, n_basic, stats.basic_type_names, stats.basic_type_decls, elSeen );
                        update_max( max_depth, depth );
                }
        }

        /// Update an ArgPackStats based on the list of types it repersents.
        void analyzeArgPack(
                        const std::vector<ast::ptr<ast::Type>> & types,
                        Stats & stats,
                        ArgPackStats & packStats,
                        // What are these two used for?
                        std::unordered_set<std::string> & seen,
                        std::unordered_set<std::string> & elSeen ) {
                std::unordered_set<std::string> type_names;
                unsigned n = 0;
                unsigned n_basic = 0;
                unsigned n_generic = 0;
                unsigned n_poly = 0;
                unsigned n_compound = 0;
                unsigned n_new = 0;

                for ( auto & type : types ) {
                        n += type->size();

                        std::stringstream ss;
                        ast::print( ss, type );
                        type_names.insert( ss.str() );
                        if ( seen.insert( ss.str() ).second ) {
                                ++n_new;
                        }

                        bool seen_poly = false;
                        unsigned max_depth = 0;
                        analyzeType(
                                type, stats, elSeen, n_basic, n_generic, n_poly, n_compound,
                                seen_poly, max_depth, 0
                        );
                        ++stats.n_generic_nesting.at( max_depth );
                }

                ++packStats.n.at( n );
                ++packStats.n_basic.at( n_basic );
                ++packStats.n_generic.at( n_generic );
                ++packStats.n_poly.at( n_poly );
                ++packStats.n_compound.at( n_compound );
                if ( n > 0 ) {
                        ++packStats.p_basic[ n_basic * 100 / n ];
                        ++packStats.p_generic[ n_generic * 100 / n ];
                        ++packStats.p_poly[ n_poly * 100 / n ];
                        ++packStats.p_compound[ n_compound * 100 / n ];
                        if ( n > 1 ) {
                                ++packStats.p_new[ (n_new - 1) * 100 / (n - 1) ];
                        }
                }
                ++packStats.n_types.at( types.size() );
        }

        /// Perform type analysis on a function type, storing information in the
        /// given ArgPackStats.
        void analyzeFunctionType( const ast::FunctionType * type, Stats& stats,
                        ArgPackStats Stats::* param_pack,
                        ArgPackStats Stats::* return_pack ) {
                // I still don't know what these are for.
                std::unordered_set<std::string> seen;
                std::unordered_set<std::string> elSeen;
                analyzeArgPack( type->params, stats, stats.*param_pack, seen, elSeen );
                analyzeArgPack( type->returns, stats, stats.*return_pack, seen, elSeen );
        }

        /// If the assertion is a function, return the function type.
        static const ast::FunctionType * getAssertionFunctionType(
                        const ast::ptr<ast::DeclWithType> & assertion ) {
                if ( auto * assertionObject = assertion.as<ast::ObjectDecl>() ) {
                        if ( auto * ptrTy = assertionObject->type.as<ast::PointerType>() ) {
                                return ptrTy->base.as<ast::FunctionType>();
                        } else {
                                return assertionObject->type.as<ast::FunctionType>();
                        }
                } else if ( auto * assertionDecl = assertion.as<ast::FunctionDecl>() ) {
                        return assertionDecl->type;
                }
                return nullptr;
        }

        void analyzeFunctionDecl( const ast::FunctionDecl * decl ) {
                Stats & stats = by_linkage[ linkage_index( decl->linkage ) ];

                ++stats.n_decls;
                const ast::FunctionType * type = decl->type.get();
                const ast::FunctionType::ForallList & forall = type->forall;
                ++stats.n_type_params.at( forall.size() );
                unsigned num_assertions = 0;
                for ( const ast::ptr<ast::TypeInstType> & instType : forall ) {
                        num_assertions += instType->base->assertions.size();
                        for ( const auto & assertion : instType->base->assertions ) {
                                if ( auto assertionType = getAssertionFunctionType( assertion ) ) {
                                        analyzeFunctionType( assertionType, stats,
                                                        &Stats::assn_params, &Stats::assn_returns );
                                }
                        }
                }
                ++stats.n_assns[ num_assertions ];
                ++stats.by_name[ decl->name ];
                analyzeFunctionType( type, stats, &Stats::params, &Stats::returns );
        }

        void analyzeUntypedExpr( const ast::UntypedExpr * expr, unsigned depth ) {
                unsigned fanout = expr->args.size();
                ++exprs_by_fanout_at_depth[ std::make_pair( depth, fanout ) ];

                for ( const ast::ptr<ast::Expr> & arg : expr->args ) {
                        if ( const auto * untyped = arg.as<ast::UntypedExpr>() ) {
                                analyzeUntypedExpr( untyped, depth + 1 );
                        }
                }
        }

public:
        void previsit( const ast::UntypedExpr * expr ) {
                visit_children = false;
                analyzeUntypedExpr( expr, 0 );
        }

        void previsit( const ast::FunctionDecl * decl ) {
                const std::string & mangleName = decl->mangleName;
                const std::string & indexName = mangleName.empty() ? decl->name : mangleName;
                if ( seen_names.insert( indexName ).second ) {
                        analyzeFunctionDecl( decl );
                }
        }

private:

        // Trying to avoid duplication by templates.
        // I couldn't do it in all cases.
        template<typename T, typename U>
        using getter = std::function<U(T const &)>;

        /// Print a single role, for every linkage and the totals.
        void printRow( const std::string & name, getter<Stats, unsigned> extract ) {
                std::cout << "\"" << name << "\",";
                for ( const Stats & stats : by_linkage ) {
                        std::cout << "," << extract( stats );
                }
                std::cout << "," << extract( total ) << std::endl;
        }

        /// Print every row in a group of maps.
        template<typename Func>
        void printAllMap( const std::string & name, Func && extract ) {
                // Get all rows from the total stats.
                for ( auto & entry : extract( total ) ) {
                        auto & key = entry.first;
                        std::cout << "\"" << name << "\"," << key;
                        for ( const auto & stats : by_linkage ) {
                                const auto & map = extract( stats );
                                auto it = map.find( key );
                                if ( map.end() == it ) {
                                        std::cout << ",0";
                                } else {
                                        std::cout << "," << it->second;
                                }
                        }
                        std::cout << "," << entry.second << std::endl;
                }
        }

        /// Accumalate information, then print every row in the remaining maps.
        template<typename Func>
        void printAllSparseHisto( const std::string & name, Func && extract ) {
                std::map<unsigned, unsigned> histos[num_named_specs];
                std::map<unsigned, unsigned> histo_total;

                // Collect all data into the histograms.
                for ( const auto & entry : extract( total ) ) {
                        ++histo_total[ entry.second ];
                }

                for ( unsigned i = 0 ; i < num_named_specs ; ++i ) {
                        for ( const auto & entry : extract( by_linkage[i] ) ) {
                                ++histos[ i ][ entry.second ];
                        }
                }

                // Get all rows from the total stats.
                for ( const auto & entry : histo_total ) {
                        const unsigned & key = entry.first;
                        std::cout << "\"" << name << "\"," << key;
                        for ( unsigned i = 0 ; i < num_named_specs ; ++i ) {
                                auto it = histos[i].find( key );
                                if ( histos[i].end() == it ) {
                                        std::cout << ",0";
                                } else {
                                        std::cout << "," << it->second;
                                }
                        }
                        std::cout << "," << entry.second << std::endl;
                }
        }

        void printAllPack( const std::string & name, ArgPackStats Stats::* field ) {
                printAllMap("n_basic_" + name, [&field](const Stats& stats) { return (stats.*field).n_basic; });
                printAllMap("n_generic_" + name, [&field](const Stats& stats) { return (stats.*field).n_generic; });
                printAllMap("n_poly_" + name, [&field](const Stats& stats) { return (stats.*field).n_poly; });
                printAllMap("n_compound_" + name, [&field](const Stats& stats) { return (stats.*field).n_compound; });
                printAllMap("n_" + name, [&field](const Stats& stats) { return (stats.*field).n; });
                printAllMap("%_basic_" + name, [&field](const Stats& stats) { return (stats.*field).p_basic; });
                printAllMap("%_generic_" + name, [&field](const Stats& stats) { return (stats.*field).p_generic; });
                printAllMap("%_poly_" + name, [&field](const Stats& stats) { return (stats.*field).p_poly; });
                printAllMap("%_compound_" + name, [&field](const Stats& stats) { return (stats.*field).p_compound; });
                printAllMap("n_distinct_types_" + name, [&field](const Stats& stats) { return (stats.*field).n_types; });
                printAllMap("%_new_types_in_" + name, [&field](const Stats& stats) { return (stats.*field).p_new; });
        }

        static void printPairMap (
                        const std::string & name,
                        const std::map<std::pair<unsigned, unsigned>, unsigned> & map ) {
                for ( const auto & entry : map ) {
                        const auto & key = entry.first;
                        std::cout << "\"" << name << "\"," << key.first << ','
                                << key.second << ',' << entry.second << std::endl;
                }
        }

public:
        void print() {
                for ( auto & stats : by_linkage ) {
                        total += stats;
                }

                std::cout << ",,\"intrinsic\",\"Cforall\",\"C\",\"autogen\",\"compiler\",\"builtinCFA\",\"builtinC\",\"other\",\"TOTAL\"" << std::endl;

                printAllMap("n_type_params", [](const Stats& stats) { return stats.n_type_params; });
                printAllMap("n_generic_params", [](const Stats& stats) { return stats.n_generic_params; });
                printAllMap("n_generic_nesting", [](const Stats& stats) { return stats.n_generic_nesting; });
                printRow("n_decls", [](const Stats& stats) { return stats.n_decls; });
                printRow("unique_names", [](const Stats& stats) { return stats.by_name.size(); });
                printAllSparseHisto("overloads", [](const Stats& stats) { return stats.by_name; });
                printRow("basic_type_names", [](const Stats& stats) { return stats.basic_type_names.size(); });
                printAllSparseHisto("basic_type_uses", [](const Stats& stats) { return stats.basic_type_names; });
                printAllSparseHisto("decls_using_basic_type", [](const Stats& stats) { return stats.basic_type_decls; });
                printRow("generic_type_names", [](const Stats& stats) { return stats.generic_type_names.size(); });
                printAllSparseHisto("generic_type_uses", [](const Stats& stats) { return stats.generic_type_names; });
                printAllSparseHisto("decls_using_generic_type", [](const Stats& stats) { return stats.generic_type_decls; });
                printRow("compound_type_names", [](const Stats& stats) { return stats.compound_type_names.size(); });
                printAllSparseHisto("compound_type_uses", [](const Stats& stats) { return stats.compound_type_names; });
                printAllSparseHisto("decls_using_compound_type", [](const Stats& stats) { return stats.compound_type_decls; });
                printAllPack("params", &Stats::params);
                printAllPack("returns", &Stats::returns);
                printAllMap("n_assns", [](const Stats& stats) { return stats.n_assns; });
                printAllPack("assn_params", &Stats::assn_params);
                printAllPack("assn_returns", &Stats::assn_returns);
                std::cout << std::endl;

                printPairMap( "exprs by depth+fanout", exprs_by_fanout_at_depth );
        }
};

} // namespace

void printDeclStats( ast::TranslationUnit & translationUnit ) {
        ast::Pass<DeclStats> stats;
        accept_all( translationUnit, stats );
        stats.core.print();
}

// Local Variables: //
// tab-width: 4 //
// mode: c++ //
// compile-command: "make install" //
// End: //