我遇到了一些我正在運行的C++代碼的問題。基本上,它對大多數輸入都可以正常工作,但是對於某些輸入,它會在我的主函數返回後發生段錯誤。這一直......令人費解。我停止了運行在內存設計缺陷,以獲得堆棧跟蹤,並返回此:Boost :: Regex Segfault(我認爲)
#0 malloc_consolidate() at /build/eglibc-oGUzwX/eglibc-2.19/malloc/malloc.c:4151
#1 _int_free() at /build/eglibc-oGUzwX/eglibc-2.19/malloc/malloc.c:4057
#2 boost::re_detail::mem_block_cache::~mem_block_cache()() at /usr/lib/x86_64-linux-gnu/libboost_regex.so.1.54.0
#3 __cxa_finalize() at /build/eglibc-oGUzwX/eglibc-2.19/stdlib/cxa_finalize.c:56
#4 ??() at /usr/lib/x86_64-linux-gnu/libboost_regex.so.1.54.0
#5 ??() at
#6 _dl_fini() at /build/eglibc-oGUzwX/eglibc-2.19/elf/dl-fini.c:252
這讓我覺得,我必須做一些錯誤的正則表達式的提振,但我不能爲我的生活想辦法。我使用正則表達式的方式是用戶可以輸入一串字符串。這些字符串可以是普通文本,也可以是正則表達式。因此,我基本上將所有輸入作爲正則表達式進行交互。但是如果一個用戶給出了一個純文本字符串,但是它的字符可以被解釋爲一個正則表達式呢?我所做的是通過所有純文本輸入字符串並轉義所有這些字符。
下面是我正在使用的代碼。這是我的主要:
int
main(int argc, char * argv[])
{
// Process input arguments
// The desired input is numVertices (int), graph density (double between 0 and 1), halfLoss (double), total loss (double),
// position expanse (double, m), velocity expanse (double, m/s)
int num_vertices;
double graph_density ;
double half_loss;
double total_loss;
double position_expanse;
double velocity_expanse;
if (argc == 1)
{
num_vertices = 48;
graph_density = 1;
half_loss = 200000;
total_loss = 400000;
position_expanse = 400000;
velocity_expanse = 10000;
}
else
{
if (argc != 7)
{
std::cerr << "Need 6 input arguments" << std::endl;
return 1;
}
std::istringstream ss(argv[1]);
num_vertices;
if (!(ss >> num_vertices))
std::cerr << "First input must be an integer" << std::endl;
graph_density = read_double_input(argv[2]);
half_loss = read_double_input(argv[3]);
total_loss = read_double_input(argv[4]);
position_expanse = read_double_input(argv[5]);
velocity_expanse = read_double_input(argv[6]);
}
// Determine how many edges to create
int num_edges = (int) ((graph_density * num_vertices * (num_vertices - 1)) + 0.5);
// Create the edges
int edges_created = 0;
std::set<std::pair<int, int> > edge_set;
while (edge_set.size() < num_edges)
{
// Pick a random start vertex and end vertex
int start_vertex = rand() % num_vertices;
int end_vertex = rand() % num_vertices;
// Make sure the start and end vertices are not equal
while (start_vertex == end_vertex)
{
end_vertex = rand() % num_vertices;
}
// Insert the new edge into our set of edges
edge_set.insert(std::pair<int, int>(start_vertex, end_vertex));
}
// Create connection handler
ConnectionHandler conn_handler;
// Create lists for from and to vertices
std::vector<std::string> from_list;
std::vector<std::string> to_list;
// Add connections to from and to lists
for (std::set<std::pair<int, int> >::const_iterator edge_it = edge_set.begin(), end_it = edge_set.end(); edge_it != end_it; ++edge_it)
{
int start_vertex = edge_it->first;
int end_vertex = edge_it->second;
from_list.push_back("Radio" + int_to_string(start_vertex));
to_list.push_back("Radio" + int_to_string(end_vertex));
}
// Read the list into the connection handler
conn_handler.read_connection_list(true, from_list, to_list);
return 0;
}
此代碼具有此ConnectionHandler對象,我創建。下面是該頭:
#ifndef CLCSIM_CONNECTIONHANDLER_HPP_
#define CLCSIM_CONNECTIONHANDLER_HPP_
#include <models/network/NetworkTypes.hpp>
#include <generated/xsd/NetworkModelInterfaceConfig.hpp>
namespace clcsim
{
typedef std::map<std::string, std::set<std::string> > ConnectionFilter;
class ConnectionHandler
{
public:
ConnectionHandler();
~ConnectionHandler();
void read_connection_list(const bool is_white_list, const std::vector<std::string> &from_radios, const std::vector<std::string> &to_radios);
private:
ConnectionFilter filter_;
std::set<std::string> from_list_;
std::set<std::string> to_list_;
bool is_white_list_;
};
} // namespace clcsim
#endif // CLCSIM_CONNECTIONHANDLER_HPP_
而這裏的源:
#include <models/network/ConnectionHandler.hpp>
#include <oasis/framework/exceptions/ConfigurationException.h>
#include <boost/regex.hpp>
namespace clcsim
{
ConnectionHandler::
ConnectionHandler()
{
}
ConnectionHandler::
~ConnectionHandler()
{
std::cout << "Destructing conn handler" << std::endl;
}
void
ConnectionHandler::
read_connection_list(
const bool is_white_list,
const std::vector<std::string> &from_radios,
const std::vector<std::string> &to_radios)
{
std::cout << "Reading the connection list" << std::endl;
// Make sure the size of both the input vectors are the same
std::size_t from_radio_size = from_radios.size();
std::size_t to_radio_size = to_radios.size();
if (from_radio_size != to_radio_size)
{
throw ofs::ConfigurationException("Error while initializing the "
"Network model: "
"Connections in from/to lists don't align"
);
}
// Create a regular expression/replacement to find all characters in a non-regular expression
// that would be interpreted as special characters in a regular expression. Replace them with
// escape characters
const boost::regex esc("[.$|()\\[\\]{}*+?\\\\]");
const std::string rep("\\\\&");
// Iterate through the specified connections
for (int i = 0; i < from_radio_size; ++i)
{
std::string from_string = boost::regex_replace(from_radios[i], esc, rep, boost::match_default | boost::format_sed);
std::string to_string = boost::regex_replace(to_radios[i], esc, rep, boost::match_default | boost::format_sed);
//std::cout << "From " << from_string << " to " << to_string << std::endl;
filter_[from_string].insert(to_string);
//filter_[from_radios.at(i)].insert(to_radios.at(i));
}
std::cout << "Got here" << std::endl;
}
} // namespace clcsim
對不起這麼多的代碼。
我看到一些類似的線程與boost :: regex的segfaults相關。在這些例子中,用戶擁有非常簡單的代碼,只是創建了一個正則表達式並將其匹配併發生錯誤。原來,這個問題與Boost版本控制有關。我試圖看看是否可以複製這些類型的錯誤,但這些簡單的例子對我來說工作得很好。所以......我很難過。我非常感謝任何幫助!
我不確定你的意思是「我停止了運行在段錯誤」。如果你有段錯誤,那麼*系統*將停止運行。如果你在一個調試器下運行,那麼你確實應該能夠得到一個顯示錯誤軌跡的堆棧軌跡,但是如果你在系統執行之前停止了這個程序,那麼你就不能知道你的堆棧軌跡表徵了尚未到來的段錯誤的位置。 –
對不起,是的,謝謝你糾正我。我在調試器下運行它,並在錯誤處停止併爲我提供堆棧跟蹤。 – user2701114
我在你的堆棧跟蹤中看到eglibc。您的軟件堆棧(boost,C++編譯器,C++運行庫等)在爲eglibc構建時是否一致?這個glibc變體現在已經停止了,如果你混合使用針對不同C庫構建的軟件和庫,你可能會遇到麻煩。 –