如何使用GDB在Emacs中调试R包(带有C代码)? [英] How to debug an R package (with C code) in Emacs using GDB?

问题描述

我目前正在编写一个R包，并通过R中的Rcpp包使用经过编译的C ++代码(Rcpp使R和C ++代码的交互对于像我这样的非程序员来说更容易，恕我直言).

I am currently writing an R package and using compiled C++ code through the Rcpp package in R (Rcpp makes the interaction of R and C++ code easier for a non-programmer like me, IMHO).

我想使用gdb调试C ++程序中的一些错误.我在Google上进行了搜索，发现主要是一些有关在emacs中调试R的资源，此处，当然还有R的《写作R扩展手册》.

I want to debug a few errors in my C++ program using gdb. I have googled and found mainly a few resources on debugging R within emacs, R-FAQ, a few mails here, and definitely the R's Writing R Extension Manual.

但是，这是我第一次这样做，我走得太远了.谁能给我一些关于如何在emacs中调试R包(或带有C ++/C代码的扩展)的指导.具体来说，我想利用将ESS与R结合使用以及将gdb与Emacs结合使用的优势(如R-FAQ所讨论的那样).

However, I am doing this for the first time, I could not go too far. Could anyone give me a few pointers on how to debug R packages (or extensions with C++/C code) within emacs. Specifically, I want to take advantages of using ESS with R and gdb with Emacs (as the R-FAQ talks about).

请注意，我可以确定如何仅使用 C或C ++程序使用gdb.但是我无法将这些知识转化为使用带有R和扩展名的gdb.

Please note, I am ok on how to use gdb using only C or C++ programs. But I could not translate this knowledge to using gdb with R and extensions.

推荐答案

您可以利用RInside(Rcpp的强大伴侣)将问题变成纯C ++开发和调试任务，从而充分利用现有的调试C ++程序的知识.

You can leverage your existing knowledge of debugging C++ programs by turning the problem into a pure C++ development and debugging task using RInside (a great companion to Rcpp).

编写一个main() C ++函数，该函数使用RInside创建R实例，执行设置测试用例的R代码(或提供R脚本)，然后从main()调用被测函数，例如

Write a main() C++ function that creates an R instance using RInside, executes R code (or sources an R script) that sets up the test case, and then call the function under test from main(), e.g.

#include <Rcpp.h>
#include <RInside.h>
#include "function_under_test.h"

int main(int argc, char *argv[]) 
{
    using namespace std;
    using namespace Rcpp;

    RInside R(argc, argv);

    string evalstr = R"(
        a <- matrix(c(1,1,1, 1,1,1, 1,1,1), nrow = 3, ncol=3)
    )";
    R.parseEvalQ(evalstr);

    SEXP a = R["a"];

    R["b"] = function_under_test(a);

    evalstr = R"(
        print(b)
    )";
    R.parseEvalQ(evalstr);

    return 0;
}

然后，通过在function_under_test()等中设置断点，使用gdb调试C ++程序时照常进行.

Then proceed as usual when debugging a C++ program with gdb by setting breakpoints in function_under_test() etc.

这样，您可以避免在R和C ++开发环境之间切换，而不必重新安装R软件包.

This way you avoid switching between R and C++ development environments and having to re-install the R package.

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