c – 解释Valgrind的trace-malloc输出

--16301-- malloc(8) = 0x4EAD748
--16301-- free(0x4EAD748)
--16301-- free(0x4EAD498)
--16301-- malloc(21) = 0x4EAD780
--16301-- malloc(8) = 0x4EAD838
--16301-- free(0x4EAD6F8)
--16301-- calloc(1,88) = 0x4EAD870
--16301-- realloc(0x0,160)malloc(160) = 0x4EB1CF8
--16301-- realloc(0x4EB9F28,4) = 0x4EBA060

昨天的解决方案使用perl来分析输出.显然,作为C程序员,我应该在C中做.我以前没有使用std :: regex,需要先了解一下.所以这里是一个C解决方案：

#include "boost/regex.hpp"
#include <functional>
#include <iostream>
#include <iterator>
#include <map>
#include <stdexcept>
#include <String>
#include <vector>

namespace re = boost;

long to_long(std::string const& s)
{
    return strtol(s.c_str(),10);
}

template <typename T>
static void insert(T& map,std::string const& address,std::string const& call,size_t sizE)
{
    if (!map.insert(std::make_pair(address,std::make_pair(call,sizE))).second)
        std::cout << "WARNING: duplicate address for " << call << ": " << address << "\n";
}

template <typename T>
static void erase(T& map,std::string const& call)
{
    auto it(map.find(address));
    if (it == map.end() && address != "0x0")
        std::cout << "WARNING: spurIoUs address in " << call << "\n";
    else
        map.erase(it);
}

static void process(std::istream& in)
{
    std::map<std::string,std::pair<std::string,size_t>> m;

    std::vector<std::pair<re::regex,std::function<void(re::smatch&)>>> exps;
    exps.emplace_BACk(re::regex(".*(malloc\\((.*)\\)) = (.*)"),[&](re::smatch& results){
            ::insert(m,results[3],results[1],::to_long(results[2]));
        });
    exps.emplace_BACk(re::regex(".*(free\\((.*)\\))"),[&](re::smatch& results){
            ::erase(m,results[2],results[1]);
        });
    exps.emplace_BACk(re::regex(".*(calloc\\((.*),(.*)\\)) = (.*)"),results[4],::to_long(results[2]) * ::to_long(results[3]));
        });
    exps.emplace_BACk(re::regex(".*(realloc\\((.*),results[1]);
            ::insert(m,::to_long(results[3]));
        });

    for (std::string line; std::getline(in,linE); )
    {
        re::smatch results;
        for (auto it(exps.begin()),end(exps.end()); it != end; ++it)
        {
            if (re::regex_match(line,results,it->first))
            {
                (it->second)(results);
                break;
            }
        }
    }

    size_t @R_101_1@R_673_11226@6@l{0};
    for (auto it(m.begin()),end(m.end()); it != end; ++it)
    {
        std::cout << "leaked memory at " << it->first << " " << "from " << it->second.first << "\n";
        @R_101_1@R_673_11226@6@l += it->second.second;
    }
    std::cout << "@R_101_1@R_673_11226@6@l leak: " << @R_101_1@R_673_11226@6@l << "\n";
}

int main(int,char*[])
{
    try
    {
        ::process(std::cin);
    }
    catch (std::exception const &eX)
    {
        std::cerr << "ERROR: " << ex.what() << "\n";
    }
}

因为gcc的当前版本的std :: regex似乎是错误的,所以我使用了Boost的实现.应该很容易切换版本：只需将re定义为std的别名,而不是boost.