From: Brent Roman <brent@...>
Date: 2007-12-16T04:53:47+09:00
Subject: What purpose does struct FRAME's tmp pointer serve?



The struct FRAME looks in Ruby 1.8.6 like this:  (excerpted from env.h)

extern struct FRAME {
    VALUE self;
    int argc;
    ID last_func;
    ID orig_func;
    VALUE last_class;
    struct FRAME *prev;
    struct FRAME *tmp;  //<--- what does this do?
    struct RNode *node;
    int iter;
    int flags;
    unsigned long uniq;
} *ruby_frame;

I cannot find any code that sets frame->tmp to any value other than 0

I've only searched in core.  Is it used by some extension library?
Or, did I just overlook something?


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