From: gmspro gmspro <lists@...>
Date: 2012-06-23T10:34:03+09:00
Subject: Re: How to debug ruby source code using gdb?, can't print array content

Ryan Davis wrote in post #1065745:
> On Jun 22, 2012, at 00:35 , Sigurd wrote:
>
>> Ruby has GDB helpers. Take a look at
> https://github.com/ruby/ruby/blob/trunk/.gdbinit
>> Fo instance rp prints any ruby value. There are other handy helpers as well.
>
> FYI, this is a help vampire that we recently banned on IRC. He has a
> long history of this.

No, i have tried this,

arr=Array.new(3)
arr[0]=5
arr[1]=3
arr[2]=2

These lines should call this function, 
https://github.com/ruby/ruby/blob/trunk/array.c#L568 according to this, 
http://www.ruby-doc.org/core-1.9.3/Array.html

So I have added couple of lines there to display the values of array. 
But i didn't get the expected result.

else {
    memfill(RARRAY_PTR(ary), len, val);
    ARY_SET_LEN(ary, len);
    int i;
    int result;
    result = 0;
    VALUE *s_arr = RARRAY_PTR(ary);
    for(i = 0; i < len; i++) {
        result = LONG2NUM(s_arr[i]);
        printf("r: %d\n",result);
    }
}

I got the result like this:

arr=Array.new(3)
arr[0]=5
arr[1]=3
arr[2]=2
r: 9
r: 9
r: 9

Why is this result? Why 9?

I have followed these to solve it:

How to convert ruby array to C array with RubyInline?

https://github.com/ruby/ruby/blob/trunk/README.EXT#L131

https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L708

https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L731


Also tried this, result = NUM2LONG(s_arr[i]); result = 
FIX2NUM(s_arr[i]); result = rb_long2int(s_arr[i]); nothing gets the 
expected result.


Can anyone please help to display/printf the value of ruby array in C?

Any reply/answer will be highly appreciated.

Thanks in advanced.

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