Lute Kamstra <[EMAIL PROTECTED]> 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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