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Re: Problems with debug-on-entry in the Lisp debugger.

From: Kim F. Storm
Subject: Re: Problems with debug-on-entry in the Lisp debugger.
Date: Mon, 07 Mar 2005 14:40:51 +0100
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

Lute Kamstra <address@hidden> writes:

> When I was thinking about these three problems, it seemed to me that
> the easiest and simplest thing to do, is to move support for
> debug-on-entry into the C implementation of the Lisp interpreter.  To
> mark a function for debug-on-entry, you could set the debug-on-entry
> property of the function's symbol and the Lisp interpreter would then
> call the debugger.

You could define a bit in the Lisp_Symbol, like this:

struct Lisp_Symbol
  unsigned gcmarkbit : 1;

  /* Non-zero means symbol serves as a variable alias.  The symbol
     holding the real value is found in the value slot.  */
  unsigned indirect_variable : 1;

  /* Non-zero means call debugger on entry.  */
  unsigned debug_on_entry;



Then you would define debug-on-entry and cancel-debug-on-entry
in C as well, which simply set or clear that bit.

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