Ruby解释器嵌入在C代码中 [英] Ruby interpreter embed in C code

问题描述

我只是尝试一本书中的一个简单示例：
我有一个sum.rb文件：

I just try a simple example from a book: I have a sum.rb file:

class Summer
  def sum(max)
  raise "Invalid maximum #{max}" if max < 0
  (max*max + max)/2
  end
end

和embed_sum.c文件：

And a embed_sum.c file:

#include <stdio.h>
#include <ruby/ruby.h>
int main ( int argc, char ** argv) 
{
  VALUE result;
  ruby_sysinit(&argc, &argv);
  RUBY_INIT_STACK;
  ruby_init();
  ruby_init_loadpath();
  rb_require("sum");
  rb_eval_string("$summer = Summer.new");
  rb_eval_string("$result = $summer.sum(10)");
  result = rb_gv_get("result");
  printf("Result = %d\n", NUM2INT(result));
  return ruby_cleanup(0);
}

我将其编译为：

gcc -Wall -lruby -I/usr/include/ruby-1.9.1/  embed_sum.c -o embed_sum

当我启动./embed_sum时，它给我第一个rb_eval_string的分段错误。
我的ruby版本是：Archlinux上的ruby 1.9.3p125（2012-02-16修订版34643）[x86_64-linux]。

When I launch ./embed_sum it gives me a segmentation fault from the first rb_eval_string. my version of ruby is : ruby 1.9.3p125 (2012-02-16 revision 34643) [x86_64-linux] on Archlinux.

此示例可能是什么问题？

What can be the problem with this example?

推荐答案

您问题的简短答案是将 rb_require（ sum）; 行更改为 rb_require（ ./ sum）; 。这是Ruby 1.9.2中引入的更改，当前目录不再位于加载路径上。

The short answer to your problem is to change the line rb_require("sum"); to rb_require("./sum");. This is the change introduced in Ruby 1.9.2 where the current directory is no longer on the load path.

更普遍的问题是嵌入式Ruby处理异常的方式。镐（我认为这是您正在使用的书，它使用类似的示例）的意思是：

The more general problem is the way embedded Ruby deals with exceptions. The Pickaxe book (which I think is the book you're using, it uses a similar example) has this to say:

Ruby代码引发异常，但未捕获该异常，您的C程序将终止。为了克服这个问题，您需要执行解释器的工作并保护所有可能引发异常的调用。

If the Ruby code raises an exception and it isn't caught, your C program will terminate. To overcome this, you need to do what the interpreter does and protect all calls that could raise an exception. This can get messy.

您需要研究使用 rb_protect 函数包装可能导致异常的对Ruby的调用。镐书中有一个例子。

You'll need to look into using the rb_protect function to wrap calls to Ruby that might cause an exception. The Pickaxe book has an example of this.

这篇关于Ruby解释器嵌入在C代码中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！