frame is half-initialized. */
Lisp_Object inhibit_lisp_code;
-/* These would ordinarily be static, but they need to be visible to GDB. */
-bool backtrace_p (union specbinding *) EXTERNALLY_VISIBLE;
-Lisp_Object *backtrace_args (union specbinding *) EXTERNALLY_VISIBLE;
-Lisp_Object backtrace_function (union specbinding *) EXTERNALLY_VISIBLE;
-union specbinding *backtrace_next (union specbinding *) EXTERNALLY_VISIBLE;
-union specbinding *backtrace_top (void) EXTERNALLY_VISIBLE;
-
static Lisp_Object funcall_lambda (Lisp_Object, ptrdiff_t, Lisp_Object *);
static Lisp_Object apply_lambda (Lisp_Object fun, Lisp_Object args);
return pdl->let.where;
}
-Lisp_Object
-backtrace_function (union specbinding *pdl)
-{
- eassert (pdl->kind == SPECPDL_BACKTRACE);
- return pdl->bt.function;
-}
-
-static ptrdiff_t
-backtrace_nargs (union specbinding *pdl)
-{
- eassert (pdl->kind == SPECPDL_BACKTRACE);
- return pdl->bt.nargs;
-}
-
-Lisp_Object *
-backtrace_args (union specbinding *pdl)
-{
- eassert (pdl->kind == SPECPDL_BACKTRACE);
- return pdl->bt.args;
-}
-
-static bool
-backtrace_debug_on_exit (union specbinding *pdl)
-{
- eassert (pdl->kind == SPECPDL_BACKTRACE);
- return pdl->bt.debug_on_exit;
-}
-
-/* Functions to modify slots of backtrace records. */
-
-static void
-set_backtrace_args (union specbinding *pdl, Lisp_Object *args)
-{
- eassert (pdl->kind == SPECPDL_BACKTRACE);
- pdl->bt.args = args;
-}
-
-static void
-set_backtrace_nargs (union specbinding *pdl, ptrdiff_t n)
-{
- eassert (pdl->kind == SPECPDL_BACKTRACE);
- pdl->bt.nargs = n;
-}
-
-static void
-set_backtrace_debug_on_exit (union specbinding *pdl, bool doe)
-{
- eassert (pdl->kind == SPECPDL_BACKTRACE);
- pdl->bt.debug_on_exit = doe;
-}
-
-/* Helper functions to scan the backtrace. */
-
-bool
-backtrace_p (union specbinding *pdl)
-{ return pdl >= specpdl; }
-
-union specbinding *
-backtrace_top (void)
-{
- union specbinding *pdl = specpdl_ptr - 1;
- while (backtrace_p (pdl) && pdl->kind != SPECPDL_BACKTRACE)
- pdl--;
- return pdl;
-}
-
-union specbinding *
-backtrace_next (union specbinding *pdl)
-{
- pdl--;
- while (backtrace_p (pdl) && pdl->kind != SPECPDL_BACKTRACE)
- pdl--;
- return pdl;
-}
-
struct handler *
make_catch_handler (Lisp_Object tag)
{
dynwind_end ();
return val;
}
-
-static void
-do_debug_on_call (Lisp_Object code)
-{
- debug_on_next_call = 0;
- set_backtrace_debug_on_exit (specpdl_ptr - 1, true);
- call_debugger (list1 (code));
-}
\f
DEFUN ("progn", Fprogn, Sprogn, 0, UNEVALLED, 0,
doc: /* Eval BODY forms sequentially and return value of last one.
conditions = Fget (real_error_symbol, Qerror_conditions);
- /* Remember from where signal was called. Skip over the frame for
- `signal' itself. If a frame for `error' follows, skip that,
- too. Don't do this when ERROR_SYMBOL is nil, because that
- is a memory-full error. */
- Vsignaling_function = Qnil;
- if (!NILP (error_symbol))
- {
- union specbinding *pdl = backtrace_next (backtrace_top ());
- if (backtrace_p (pdl) && EQ (backtrace_function (pdl), Qerror))
- pdl = backtrace_next (pdl);
- if (backtrace_p (pdl))
- Vsignaling_function = backtrace_function (pdl);
- }
-
for (h = handlerlist; h; h = h->next)
{
if (h->type != CONDITION_CASE)
}
}
-void
-record_in_backtrace (Lisp_Object function, Lisp_Object *args, ptrdiff_t nargs)
-{
- eassert (nargs >= UNEVALLED);
- specpdl_ptr->bt.kind = SPECPDL_BACKTRACE;
- specpdl_ptr->bt.debug_on_exit = false;
- specpdl_ptr->bt.function = function;
- specpdl_ptr->bt.args = args;
- specpdl_ptr->bt.nargs = nargs;
- grow_specpdl ();
- scm_dynwind_unwind_handler (unbind_once, NULL, SCM_F_WIND_EXPLICITLY);
-}
-
static void
set_lisp_eval_depth (void *data)
{
UNGCPRO;
- //set_backtrace_args (specpdl_ptr - 1, arg_vector);
- //set_backtrace_nargs (specpdl_ptr - 1, i);
tem = funcall_lambda (fun, numargs, arg_vector);
- /* Do the debug-on-exit now, while arg_vector still exists. */
- if (backtrace_debug_on_exit (specpdl_ptr - 1))
- {
- /* Don't do it again when we return to eval. */
- set_backtrace_debug_on_exit (specpdl_ptr - 1, false);
- tem = call_debugger (list2 (Qexit, tem));
- }
SAFE_FREE ();
return tem;
}
switch (specpdl_ptr->kind)
{
- case SPECPDL_BACKTRACE:
- break;
case SPECPDL_LET:
{ /* If variable has a trivial value (no forwarding), we can
just set it. No need to check for constant symbols here,
CHECK_SYMBOL (symbol);
return SYMBOL_DECLARED_SPECIAL (XSYMBOL (symbol)) ? Qt : Qnil;
}
-
-\f
-DEFUN ("backtrace-debug", Fbacktrace_debug, Sbacktrace_debug, 2, 2, 0,
- doc: /* Set the debug-on-exit flag of eval frame LEVEL levels down to FLAG.
-The debugger is entered when that frame exits, if the flag is non-nil. */)
- (Lisp_Object level, Lisp_Object flag)
-{
- union specbinding *pdl = backtrace_top ();
- register EMACS_INT i;
-
- CHECK_NUMBER (level);
-
- for (i = 0; backtrace_p (pdl) && i < XINT (level); i++)
- pdl = backtrace_next (pdl);
-
- if (backtrace_p (pdl))
- set_backtrace_debug_on_exit (pdl, !NILP (flag));
-
- return flag;
-}
-
-DEFUN ("backtrace", Fbacktrace, Sbacktrace, 0, 0, "",
- doc: /* Print a trace of Lisp function calls currently active.
-Output stream used is value of `standard-output'. */)
- (void)
-{
- union specbinding *pdl = backtrace_top ();
- Lisp_Object tem;
- Lisp_Object old_print_level = Vprint_level;
-
- if (NILP (Vprint_level))
- XSETFASTINT (Vprint_level, 8);
-
- while (backtrace_p (pdl))
- {
- write_string (backtrace_debug_on_exit (pdl) ? "* " : " ", 2);
- if (backtrace_nargs (pdl) == UNEVALLED)
- {
- Fprin1 (Fcons (backtrace_function (pdl), *backtrace_args (pdl)),
- Qnil);
- write_string ("\n", -1);
- }
- else
- {
- tem = backtrace_function (pdl);
- Fprin1 (tem, Qnil); /* This can QUIT. */
- write_string ("(", -1);
- {
- ptrdiff_t i;
- for (i = 0; i < backtrace_nargs (pdl); i++)
- {
- if (i) write_string (" ", -1);
- Fprin1 (backtrace_args (pdl)[i], Qnil);
- }
- }
- write_string (")\n", -1);
- }
- pdl = backtrace_next (pdl);
- }
-
- Vprint_level = old_print_level;
- return Qnil;
-}
-
-static union specbinding *
-get_backtrace_frame (Lisp_Object nframes, Lisp_Object base)
-{
- union specbinding *pdl = backtrace_top ();
- register EMACS_INT i;
-
- CHECK_NATNUM (nframes);
-
- if (!NILP (base))
- { /* Skip up to `base'. */
- base = Findirect_function (base, Qt);
- while (backtrace_p (pdl)
- && !EQ (base, Findirect_function (backtrace_function (pdl), Qt)))
- pdl = backtrace_next (pdl);
- }
-
- /* Find the frame requested. */
- for (i = XFASTINT (nframes); i > 0 && backtrace_p (pdl); i--)
- pdl = backtrace_next (pdl);
-
- return pdl;
-}
-
-DEFUN ("backtrace-frame", Fbacktrace_frame, Sbacktrace_frame, 1, 2, NULL,
- doc: /* Return the function and arguments NFRAMES up from current execution point.
-If that frame has not evaluated the arguments yet (or is a special form),
-the value is (nil FUNCTION ARG-FORMS...).
-If that frame has evaluated its arguments and called its function already,
-the value is (t FUNCTION ARG-VALUES...).
-A &rest arg is represented as the tail of the list ARG-VALUES.
-FUNCTION is whatever was supplied as car of evaluated list,
-or a lambda expression for macro calls.
-If NFRAMES is more than the number of frames, the value is nil.
-If BASE is non-nil, it should be a function and NFRAMES counts from its
-nearest activation frame. */)
- (Lisp_Object nframes, Lisp_Object base)
-{
- union specbinding *pdl = get_backtrace_frame (nframes, base);
-
- if (!backtrace_p (pdl))
- return Qnil;
- if (backtrace_nargs (pdl) == UNEVALLED)
- return Fcons (Qnil,
- Fcons (backtrace_function (pdl), *backtrace_args (pdl)));
- else
- {
- Lisp_Object tem = Flist (backtrace_nargs (pdl), backtrace_args (pdl));
-
- return Fcons (Qt, Fcons (backtrace_function (pdl), tem));
- }
-}
-
-/* For backtrace-eval, we want to temporarily unwind the last few elements of
- the specpdl stack, and then rewind them. We store the pre-unwind values
- directly in the pre-existing specpdl elements (i.e. we swap the current
- value and the old value stored in the specpdl), kind of like the inplace
- pointer-reversal trick. As it turns out, the rewind does the same as the
- unwind, except it starts from the other end of the specpdl stack, so we use
- the same function for both unwind and rewind. */
-static void
-backtrace_eval_unrewind (int distance)
-{
- union specbinding *tmp = specpdl_ptr;
- int step = -1;
- if (distance < 0)
- { /* It's a rewind rather than unwind. */
- tmp += distance - 1;
- step = 1;
- distance = -distance;
- }
-
- for (; distance > 0; distance--)
- {
- tmp += step;
- /* */
- switch (tmp->kind)
- {
- case SPECPDL_BACKTRACE:
- break;
- case SPECPDL_LET:
- { /* If variable has a trivial value (no forwarding), we can
- just set it. No need to check for constant symbols here,
- since that was already done by specbind. */
- sym_t sym = XSYMBOL (specpdl_symbol (tmp));
- if (SYMBOL_REDIRECT (sym) == SYMBOL_PLAINVAL)
- {
- Lisp_Object old_value = specpdl_old_value (tmp);
- set_specpdl_old_value (tmp, SYMBOL_VAL (sym));
- SET_SYMBOL_VAL (sym, old_value);
- break;
- }
- else
- { /* FALLTHROUGH!!
- NOTE: we only ever come here if make_local_foo was used for
- the first time on this var within this let. */
- }
- }
- case SPECPDL_LET_DEFAULT:
- {
- Lisp_Object sym = specpdl_symbol (tmp);
- Lisp_Object old_value = specpdl_old_value (tmp);
- set_specpdl_old_value (tmp, Fdefault_value (sym));
- Fset_default (sym, old_value);
- }
- break;
- case SPECPDL_LET_LOCAL:
- {
- Lisp_Object symbol = specpdl_symbol (tmp);
- Lisp_Object where = specpdl_where (tmp);
- Lisp_Object old_value = specpdl_old_value (tmp);
- eassert (BUFFERP (where));
-
- /* If this was a local binding, reset the value in the appropriate
- buffer, but only if that buffer's binding still exists. */
- if (!NILP (Flocal_variable_p (symbol, where)))
- {
- set_specpdl_old_value
- (tmp, Fbuffer_local_value (symbol, where));
- set_internal (symbol, old_value, where, 1);
- }
- }
- break;
- }
- }
-}
-
-DEFUN ("backtrace-eval", Fbacktrace_eval, Sbacktrace_eval, 2, 3, NULL,
- doc: /* Evaluate EXP in the context of some activation frame.
-NFRAMES and BASE specify the activation frame to use, as in `backtrace-frame'. */)
- (Lisp_Object exp, Lisp_Object nframes, Lisp_Object base)
-{
- union specbinding *pdl = get_backtrace_frame (nframes, base);
- dynwind_begin ();
- ptrdiff_t distance = specpdl_ptr - pdl;
- eassert (distance >= 0);
-
- if (!backtrace_p (pdl))
- error ("Activation frame not found!");
-
- backtrace_eval_unrewind (distance);
- record_unwind_protect_int (backtrace_eval_unrewind, -distance);
-
- /* Use eval_sub rather than Feval since the main motivation behind
- backtrace-eval is to be able to get/set the value of lexical variables
- from the debugger. */
- Lisp_Object tem1 = eval_sub (exp);
- dynwind_end ();
- return tem1;
-}
-
-DEFUN ("backtrace--locals", Fbacktrace__locals, Sbacktrace__locals, 1, 2, NULL,
- doc: /* Return names and values of local variables of a stack frame.
-NFRAMES and BASE specify the activation frame to use, as in `backtrace-frame'. */)
- (Lisp_Object nframes, Lisp_Object base)
-{
- union specbinding *frame = get_backtrace_frame (nframes, base);
- union specbinding *prevframe
- = get_backtrace_frame (make_number (XFASTINT (nframes) - 1), base);
- ptrdiff_t distance = specpdl_ptr - frame;
- Lisp_Object result = Qnil;
- eassert (distance >= 0);
-
- if (!backtrace_p (prevframe))
- error ("Activation frame not found!");
- if (!backtrace_p (frame))
- error ("Activation frame not found!");
-
- /* The specpdl entries normally contain the symbol being bound along with its
- `old_value', so it can be restored. The new value to which it is bound is
- available in one of two places: either in the current value of the
- variable (if it hasn't been rebound yet) or in the `old_value' slot of the
- next specpdl entry for it.
- `backtrace_eval_unrewind' happens to swap the role of `old_value'
- and "new value", so we abuse it here, to fetch the new value.
- It's ugly (we'd rather not modify global data) and a bit inefficient,
- but it does the job for now. */
- backtrace_eval_unrewind (distance);
-
- /* Grab values. */
- {
- union specbinding *tmp = prevframe;
- for (; tmp > frame; tmp--)
- {
- switch (tmp->kind)
- {
- case SPECPDL_LET:
- case SPECPDL_LET_DEFAULT:
- case SPECPDL_LET_LOCAL:
- {
- Lisp_Object sym = specpdl_symbol (tmp);
- Lisp_Object val = specpdl_old_value (tmp);
- if (EQ (sym, Qinternal_interpreter_environment))
- {
- Lisp_Object env = val;
- for (; CONSP (env); env = XCDR (env))
- {
- Lisp_Object binding = XCAR (env);
- if (CONSP (binding))
- result = Fcons (Fcons (XCAR (binding),
- XCDR (binding)),
- result);
- }
- }
- else
- result = Fcons (Fcons (sym, val), result);
- }
- }
- }
- }
-
- /* Restore values from specpdl to original place. */
- backtrace_eval_unrewind (-distance);
-
- return result;
-}
-
-\f
-void
-get_backtrace (Lisp_Object array)
-{
- union specbinding *pdl = backtrace_next (backtrace_top ());
- ptrdiff_t i = 0, asize = ASIZE (array);
-
- /* Copy the backtrace contents into working memory. */
- for (; i < asize; i++)
- {
- if (backtrace_p (pdl))
- {
- ASET (array, i, backtrace_function (pdl));
- pdl = backtrace_next (pdl);
- }
- else
- ASET (array, i, Qnil);
- }
-}
-
-Lisp_Object backtrace_top_function (void)
-{
- union specbinding *pdl = backtrace_top ();
- return (backtrace_p (pdl) ? backtrace_function (pdl) : Qnil);
-}
\f
_Noreturn SCM
abort_to_prompt (SCM tag, SCM arglst)
HCoop / bpt / emacs.git / commitdiff