source: src/Common/Heap.cc@ a8de0f4

//
// Cforall Version 1.0.0 Copyright (C) 2018 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// Heap.cc --
//
// Author           : Thierry Delisle
// Created On       : Thu May  3 16:16:10 2018
// Last Modified By : Peter A. Buhr
// Last Modified On : Fri May  4 17:27:31 2018
// Update Count     : 28
//

#include <cassert>
#include <cmath>
#include <cstddef>
#include <cstring>
#include <iomanip>
#include <iostream>

//#define WITH_HEAP_STATISTICS

namespace HeapStats {
#if !defined( WITH_HEAP_STATISTICS )
        void newPass( const char * const ) {}

        void printStats() {}
#else
        struct StatBlock {
                const char * name = nullptr;
                size_t mallocs    = 0;
                size_t frees      = 0;
        };

        StatBlock    passes[100] = {{ "Pre-Parse", 0, 0 }};
        const size_t passes_size = sizeof(passes) / sizeof(passes[0]);
        size_t       passes_cnt = 1;

        void newPass( const char * const name ) {
                passes[passes_cnt].name    = name;
                passes[passes_cnt].mallocs = 0;
                passes[passes_cnt].frees   = 0;
                passes_cnt++;

                assertf(passes_cnt < passes_size, "Too many passes for HeapStats, increase the size of the array in Heap.h");
        }

        void print(size_t value, size_t total) {
                std::cerr << std::setw(12) << value;
                std::cerr << "(" << std::setw(3);
                std::cerr << (value == 0 ? 0 : value * 100 / total);
                std::cerr << "%) | ";
        }

        void print(const StatBlock& stat, size_t nc, size_t total_mallocs, size_t total_frees) {
                std::cerr << std::setw(nc) << stat.name;
                std::cerr << " | ";

                print(stat.mallocs, total_mallocs);
                print(stat.frees  , total_frees  );
                std::cerr << "\n";
        }

        void print(char c, size_t nc) {
                for(size_t i = 0; i < nc; i++) {
                        std::cerr << c;
                }
                std::cerr << '\n';
        }

        void printStats() {
                size_t nc = 0;
                size_t total_mallocs = 0;
                size_t total_frees   = 0;
                for(size_t i = 0; i < passes_cnt; i++) {
                        nc = std::max(nc, std::strlen(passes[i].name));
                        total_mallocs += passes[i].mallocs;
                        total_frees   += passes[i].frees;
                }
                size_t nct = nc + 44;

                const char * const title = "Heap Usage Statistic";
                print('=', nct);
                for(size_t i = 0; i < (nct - std::strlen(title)) / 2; i++) std::cerr << ' ';
                std::cerr << title << std::endl;
                print('-', nct);
                std::cerr << std::setw(nc) << "Pass";
                std::cerr << " |       Malloc Count |         Free Count |" << std::endl;

                print('-', nct);
                for(size_t i = 0; i < passes_cnt; i++) {
                        print(passes[i], nc, total_mallocs, total_frees);
                }
                print('-', nct);
                print({"Sum", total_mallocs, total_frees}, nc, total_mallocs, total_frees);

        }

#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
        extern "C" {
#include <dlfcn.h>
#include <execinfo.h>
        }

//=============================================================================================
// Interposing helpers
//=============================================================================================

        typedef void (* generic_fptr_t)(void);
        generic_fptr_t interpose_symbol( const char * symbol, const char * version ) {
                const char * error;

                static void * library;
                if ( ! library ) {
#if defined( RTLD_NEXT )
                        library = RTLD_NEXT;
#else
                        // missing RTLD_NEXT => must hard-code library name, assuming libstdc++
                        library = dlopen( "libc.so.6", RTLD_LAZY );
                        error = dlerror();
                        if ( error ) {
                                std::cerr << "interpose_symbol : failed to open libc, " << error << std::endl;
                                abort();
                        }
#endif // RTLD_NEXT
                } // if

                generic_fptr_t fptr;

#if defined( _GNU_SOURCE )
                if ( version ) {
                        fptr = (generic_fptr_t)dlvsym( library, symbol, version );
                } else {
                        fptr = (generic_fptr_t)dlsym( library, symbol );
                }
#else
                fptr = (generic_fptr_t)dlsym( library, symbol );
#endif // _GNU_SOURCE

                error = dlerror();
                if ( error ) {
                        std::cerr << "interpose_symbol : internal error, " << error << std::endl;
                        abort();
                }

                return fptr;
        }

        extern "C" {
                void * malloc( size_t size ) __attribute__((malloc));
                void * malloc( size_t size ) {
                        static auto __malloc = reinterpret_cast<void * (*)(size_t)>(interpose_symbol( "malloc", nullptr ));
                        if( passes_cnt > 0 ) passes[passes_cnt - 1].mallocs++;
                        return __malloc( size );
                }

                void free( void * ptr ) {
                        static auto __free = reinterpret_cast<void   (*)(void *)>(interpose_symbol( "free", nullptr ));
                        if( passes_cnt > 0 ) passes[passes_cnt - 1].frees++;
                        return __free( ptr );
                }

                void * calloc( size_t nelem, size_t size ) {
                        static auto __calloc = reinterpret_cast<void * (*)(size_t, size_t)>(interpose_symbol( "calloc", nullptr ));
                        if( passes_cnt > 0 ) passes[passes_cnt - 1].mallocs++;
                        return __calloc( nelem, size );
                }

                void * realloc( void * ptr, size_t size ) {
                        static auto __realloc = reinterpret_cast<void * (*)(void *, size_t)>(interpose_symbol( "realloc", nullptr ));
                        void * s = __realloc( ptr, size );
                        if ( s != ptr && passes_cnt > 0 ) {                     // did realloc get new storage ?
                                passes[passes_cnt - 1].mallocs++;
                                passes[passes_cnt - 1].frees++;
                        } // if
                        return s;
                }
        }
#endif
}