#include "commands.h"
#include "keyboard.h"
#include "dispextern.h"
+#include "guile.h"
+
+static void unbind_once (void *ignore);
/* Chain of condition and catch handlers currently in effect. */
return pdl->let.where;
}
-static Lisp_Object
-specpdl_arg (union specbinding *pdl)
-{
- eassert (pdl->kind == SPECPDL_UNWIND);
- return pdl->unwind.arg;
-}
-
Lisp_Object
backtrace_function (union specbinding *pdl)
{
return pdl;
}
+struct handler *
+make_catch_handler (Lisp_Object tag)
+{
+ struct handler *c = xmalloc (sizeof (*c));
+ c->type = CATCHER;
+ c->tag_or_ch = tag;
+ c->val = Qnil;
+ c->var = Qnil;
+ c->body = Qnil;
+ c->next = handlerlist;
+ c->lisp_eval_depth = lisp_eval_depth;
+ c->poll_suppress_count = poll_suppress_count;
+ c->interrupt_input_blocked = interrupt_input_blocked;
+ c->ptag = make_prompt_tag ();
+ return c;
+}
+
+struct handler *
+make_condition_handler (Lisp_Object tag)
+{
+ struct handler *c = xmalloc (sizeof (*c));
+ c->type = CONDITION_CASE;
+ c->tag_or_ch = tag;
+ c->val = Qnil;
+ c->var = Qnil;
+ c->body = Qnil;
+ c->next = handlerlist;
+ c->lisp_eval_depth = lisp_eval_depth;
+ c->poll_suppress_count = poll_suppress_count;
+ c->interrupt_input_blocked = interrupt_input_blocked;
+ c->ptag = make_prompt_tag ();
+ return c;
+}
void
init_eval_once (void)
Vrun_hooks = Qnil;
}
-static struct handler handlerlist_sentinel;
+static struct handler *handlerlist_sentinel;
void
init_eval (void)
{
specpdl_ptr = specpdl;
- { /* Put a dummy catcher at top-level so that handlerlist is never NULL.
- This is important since handlerlist->nextfree holds the freelist
- which would otherwise leak every time we unwind back to top-level. */
- struct handler *c;
- handlerlist = handlerlist_sentinel.nextfree = &handlerlist_sentinel;
- PUSH_HANDLER (c, Qunbound, CATCHER);
- eassert (c == &handlerlist_sentinel);
- handlerlist_sentinel.nextfree = NULL;
- handlerlist_sentinel.next = NULL;
- }
+ handlerlist_sentinel = make_catch_handler (Qunbound);
+ handlerlist = handlerlist_sentinel;
Vquit_flag = Qnil;
debug_on_next_call = 0;
lisp_eval_depth = 0;
call_debugger (Lisp_Object arg)
{
bool debug_while_redisplaying;
- ptrdiff_t count = SPECPDL_INDEX ();
+ dynwind_begin ();
Lisp_Object val;
EMACS_INT old_depth = max_lisp_eval_depth;
/* Do not allow max_specpdl_size less than actual depth (Bug#16603). */
- EMACS_INT old_max = max (max_specpdl_size, count);
+ EMACS_INT old_max = max_specpdl_size;
if (lisp_eval_depth + 40 > max_lisp_eval_depth)
max_lisp_eval_depth = lisp_eval_depth + 40;
- /* While debugging Bug#16603, previous value of 100 was found
- too small to avoid specpdl overflow in the debugger itself. */
- if (max_specpdl_size - 200 < count)
- max_specpdl_size = count + 200;
-
- if (old_max == count)
- {
- /* We can enter the debugger due to specpdl overflow (Bug#16603). */
- specpdl_ptr--;
- grow_specpdl ();
- }
-
/* Restore limits after leaving the debugger. */
record_unwind_protect (restore_stack_limits,
Fcons (make_number (old_max),
if (debug_while_redisplaying)
Ftop_level ();
- return unbind_to (count, val);
+ dynwind_end ();
+ return val;
}
static void
(Lisp_Object args)
{
Lisp_Object varlist, var, val, elt, lexenv;
- ptrdiff_t count = SPECPDL_INDEX ();
+ dynwind_begin ();
struct gcpro gcpro1, gcpro2, gcpro3;
GCPRO3 (args, elt, varlist);
}
UNGCPRO;
val = Fprogn (XCDR (args));
- return unbind_to (count, val);
+ dynwind_end ();
+ return val;
}
DEFUN ("let", Flet, Slet, 1, UNEVALLED, 0,
{
Lisp_Object *temps, tem, lexenv;
register Lisp_Object elt, varlist;
- ptrdiff_t count = SPECPDL_INDEX ();
+ dynwind_begin ();
ptrdiff_t argnum;
struct gcpro gcpro1, gcpro2;
USE_SAFE_ALLOCA;
elt = Fprogn (XCDR (args));
SAFE_FREE ();
- return unbind_to (count, elt);
+ dynwind_end ();
+ return elt;
}
DEFUN ("while", Fwhile, Swhile, 1, UNEVALLED, 0,
#define clobbered_eassert(E) ((void) 0)
+static void
+set_handlerlist (void *data)
+{
+ handlerlist = data;
+}
+
+static void
+restore_handler (void *data)
+{
+ struct handler *c = data;
+ set_poll_suppress_count (c->poll_suppress_count);
+ unblock_input_to (c->interrupt_input_blocked);
+ immediate_quit = 0;
+}
+
+struct icc_thunk_env
+{
+ enum { ICC_0, ICC_1, ICC_2, ICC_3, ICC_N } type;
+ union
+ {
+ Lisp_Object (*fun0) (void);
+ Lisp_Object (*fun1) (Lisp_Object);
+ Lisp_Object (*fun2) (Lisp_Object, Lisp_Object);
+ Lisp_Object (*fun3) (Lisp_Object, Lisp_Object, Lisp_Object);
+ Lisp_Object (*funn) (ptrdiff_t, Lisp_Object *);
+ };
+ union
+ {
+ struct
+ {
+ Lisp_Object arg1;
+ Lisp_Object arg2;
+ Lisp_Object arg3;
+ };
+ struct
+ {
+ ptrdiff_t nargs;
+ Lisp_Object *args;
+ };
+ };
+ struct handler *c;
+};
+
+static Lisp_Object
+icc_thunk (void *data)
+{
+ Lisp_Object tem;
+ struct icc_thunk_env *e = data;
+ scm_dynwind_begin (0);
+ scm_dynwind_unwind_handler (restore_handler, e->c, 0);
+ scm_dynwind_unwind_handler (set_handlerlist,
+ handlerlist,
+ SCM_F_WIND_EXPLICITLY);
+ handlerlist = e->c;
+ switch (e->type)
+ {
+ case ICC_0:
+ tem = e->fun0 ();
+ break;
+ case ICC_1:
+ tem = e->fun1 (e->arg1);
+ break;
+ case ICC_2:
+ tem = e->fun2 (e->arg1, e->arg2);
+ break;
+ case ICC_3:
+ tem = e->fun3 (e->arg1, e->arg2, e->arg3);
+ break;
+ case ICC_N:
+ tem = e->funn (e->nargs, e->args);
+ break;
+ default:
+ emacs_abort ();
+ }
+ scm_dynwind_end ();
+ return tem;
+}
+
+static Lisp_Object
+icc_handler (void *data, Lisp_Object k, Lisp_Object v)
+{
+ Lisp_Object (*f) (Lisp_Object) = data;
+ return f (v);
+}
+
+struct icc_handler_n_env
+{
+ Lisp_Object (*fun) (Lisp_Object, ptrdiff_t, Lisp_Object *);
+ ptrdiff_t nargs;
+ Lisp_Object *args;
+};
+
+static Lisp_Object
+icc_handler_n (void *data, Lisp_Object k, Lisp_Object v)
+{
+ struct icc_handler_n_env *e = data;
+ return e->fun (v, e->nargs, e->args);
+}
+
+static Lisp_Object
+icc_lisp_handler (void *data, Lisp_Object k, Lisp_Object val)
+{
+ Lisp_Object tem;
+ struct handler *h = data;
+ Lisp_Object var = h->var;
+ scm_dynwind_begin (0);
+ if (!NILP (var))
+ {
+ if (!NILP (Vinternal_interpreter_environment))
+ specbind (Qinternal_interpreter_environment,
+ Fcons (Fcons (var, val),
+ Vinternal_interpreter_environment));
+ else
+ specbind (var, val);
+ }
+ tem = Fprogn (h->body);
+ scm_dynwind_end ();
+ return tem;
+}
+
/* Set up a catch, then call C function FUNC on argument ARG.
FUNC should return a Lisp_Object.
This is how catches are done from within C code. */
Lisp_Object
internal_catch (Lisp_Object tag, Lisp_Object (*func) (Lisp_Object), Lisp_Object arg)
{
- /* This structure is made part of the chain `catchlist'. */
- struct handler *c;
-
- /* Fill in the components of c, and put it on the list. */
- PUSH_HANDLER (c, tag, CATCHER);
-
- /* Call FUNC. */
- if (! sys_setjmp (c->jmp))
- {
- Lisp_Object val = (*func) (arg);
- clobbered_eassert (handlerlist == c);
- handlerlist = handlerlist->next;
- return val;
- }
- else
- { /* Throw works by a longjmp that comes right here. */
- Lisp_Object val = handlerlist->val;
- clobbered_eassert (handlerlist == c);
- handlerlist = handlerlist->next;
- return val;
- }
+ struct handler *c = make_catch_handler (tag);
+ struct icc_thunk_env env = { .type = ICC_1,
+ .fun1 = func,
+ .arg1 = arg,
+ .c = c };
+ return call_with_prompt (c->ptag,
+ make_c_closure (icc_thunk, &env, 0, 0),
+ make_c_closure (icc_handler, Fidentity, 2, 0));
}
/* Unwind the specbind, catch, and handler stacks back to CATCH, and
This is used for correct unwinding in Fthrow and Fsignal. */
+static Lisp_Object unbind_to_1 (ptrdiff_t, Lisp_Object, bool);
+
static _Noreturn void
unwind_to_catch (struct handler *catch, Lisp_Object value)
{
- bool last_time;
-
- eassert (catch->next);
-
- /* Save the value in the tag. */
- catch->val = value;
-
- /* Restore certain special C variables. */
- set_poll_suppress_count (catch->poll_suppress_count);
- unblock_input_to (catch->interrupt_input_blocked);
- immediate_quit = 0;
-
- do
- {
- /* Unwind the specpdl stack, and then restore the proper set of
- handlers. */
- unbind_to (handlerlist->pdlcount, Qnil);
- last_time = handlerlist == catch;
- if (! last_time)
- handlerlist = handlerlist->next;
- }
- while (! last_time);
-
- eassert (handlerlist == catch);
-
- gcprolist = catch->gcpro;
-#ifdef DEBUG_GCPRO
- gcpro_level = gcprolist ? gcprolist->level + 1 : 0;
-#endif
- lisp_eval_depth = catch->lisp_eval_depth;
-
- sys_longjmp (catch->jmp, 1);
+ abort_to_prompt (catch->ptag, scm_list_1 (value));
}
DEFUN ("throw", Fthrow, Sthrow, 2, 2, 0,
(Lisp_Object args)
{
Lisp_Object val;
- ptrdiff_t count = SPECPDL_INDEX ();
+ dynwind_begin ();
record_unwind_protect (unwind_body, XCDR (args));
val = eval_sub (XCAR (args));
- return unbind_to (count, val);
+ dynwind_end ();
+ return val;
}
\f
DEFUN ("condition-case", Fcondition_case, Scondition_case, 2, UNEVALLED, 0,
return internal_lisp_condition_case (var, bodyform, handlers);
}
+static Lisp_Object
+ilcc1 (Lisp_Object var, Lisp_Object bodyform, Lisp_Object handlers)
+{
+ if (CONSP (handlers))
+ {
+ Lisp_Object clause = XCAR (handlers);
+ Lisp_Object condition = XCAR (clause);
+ Lisp_Object body = XCDR (clause);
+ if (!CONSP (condition))
+ condition = Fcons (condition, Qnil);
+ struct handler *c = make_condition_handler (condition);
+ c->var = var;
+ c->body = body;
+ struct icc_thunk_env env = { .type = ICC_3,
+ .fun3 = ilcc1,
+ .arg1 = var,
+ .arg2 = bodyform,
+ .arg3 = XCDR (handlers),
+ .c = c };
+ return call_with_prompt (c->ptag,
+ make_c_closure (icc_thunk, &env, 0, 0),
+ make_c_closure (icc_lisp_handler, c, 2, 0));
+ }
+ else
+ {
+ return eval_sub (bodyform);
+ }
+}
+
/* Like Fcondition_case, but the args are separate
rather than passed in a list. Used by Fbyte_code. */
Lisp_Object val;
struct handler *c;
struct handler *oldhandlerlist = handlerlist;
- int clausenb = 0;
CHECK_SYMBOL (var);
for (val = handlers; CONSP (val); val = XCDR (val))
{
Lisp_Object tem = XCAR (val);
- clausenb++;
if (! (NILP (tem)
|| (CONSP (tem)
&& (SYMBOLP (XCAR (tem))
SDATA (Fprin1_to_string (tem, Qt)));
}
- { /* The first clause is the one that should be checked first, so it should
- be added to handlerlist last. So we build in `clauses' a table that
- contains `handlers' but in reverse order. */
- Lisp_Object *clauses = alloca (clausenb * sizeof (Lisp_Object *));
- Lisp_Object *volatile clauses_volatile = clauses;
- int i = clausenb;
- for (val = handlers; CONSP (val); val = XCDR (val))
- clauses[--i] = XCAR (val);
- for (i = 0; i < clausenb; i++)
- {
- Lisp_Object clause = clauses[i];
- Lisp_Object condition = XCAR (clause);
- if (!CONSP (condition))
- condition = Fcons (condition, Qnil);
- PUSH_HANDLER (c, condition, CONDITION_CASE);
- if (sys_setjmp (c->jmp))
- {
- ptrdiff_t count = SPECPDL_INDEX ();
- Lisp_Object val = handlerlist->val;
- Lisp_Object *chosen_clause = clauses_volatile;
- for (c = handlerlist->next; c != oldhandlerlist; c = c->next)
- chosen_clause++;
- handlerlist = oldhandlerlist;
- if (!NILP (var))
- {
- if (!NILP (Vinternal_interpreter_environment))
- specbind (Qinternal_interpreter_environment,
- Fcons (Fcons (var, val),
- Vinternal_interpreter_environment));
- else
- specbind (var, val);
- }
- val = Fprogn (XCDR (*chosen_clause));
- /* Note that this just undoes the binding of var; whoever
- longjumped to us unwound the stack to c.pdlcount before
- throwing. */
- if (!NILP (var))
- unbind_to (count, Qnil);
- return val;
- }
- }
- }
-
- val = eval_sub (bodyform);
- handlerlist = oldhandlerlist;
- return val;
+ return ilcc1 (var, bodyform, Freverse (handlers));
}
/* Call the function BFUN with no arguments, catching errors within it
Lisp_Object (*hfun) (Lisp_Object))
{
Lisp_Object val;
- struct handler *c;
-
- PUSH_HANDLER (c, handlers, CONDITION_CASE);
- if (sys_setjmp (c->jmp))
- {
- Lisp_Object val = handlerlist->val;
- clobbered_eassert (handlerlist == c);
- handlerlist = handlerlist->next;
- return (*hfun) (val);
- }
+ struct handler *c = make_condition_handler (handlers);
- val = (*bfun) ();
- clobbered_eassert (handlerlist == c);
- handlerlist = handlerlist->next;
- return val;
+ struct icc_thunk_env env = { .type = ICC_0, .fun0 = bfun, .c = c };
+ return call_with_prompt (c->ptag,
+ make_c_closure (icc_thunk, &env, 0, 0),
+ make_c_closure (icc_handler, hfun, 2, 0));
}
/* Like internal_condition_case but call BFUN with ARG as its argument. */
Lisp_Object handlers, Lisp_Object (*hfun) (Lisp_Object))
{
Lisp_Object val;
- struct handler *c;
+ struct handler *c = make_condition_handler (handlers);
- PUSH_HANDLER (c, handlers, CONDITION_CASE);
- if (sys_setjmp (c->jmp))
- {
- Lisp_Object val = handlerlist->val;
- clobbered_eassert (handlerlist == c);
- handlerlist = handlerlist->next;
- return (*hfun) (val);
- }
-
- val = (*bfun) (arg);
- clobbered_eassert (handlerlist == c);
- handlerlist = handlerlist->next;
- return val;
+ struct icc_thunk_env env = { .type = ICC_1,
+ .fun1 = bfun,
+ .arg1 = arg,
+ .c = c };
+ return call_with_prompt (c->ptag,
+ make_c_closure (icc_thunk, &env, 0, 0),
+ make_c_closure (icc_handler, hfun, 2, 0));
}
/* Like internal_condition_case_1 but call BFUN with ARG1 and ARG2 as
Lisp_Object (*hfun) (Lisp_Object))
{
Lisp_Object val;
- struct handler *c;
-
- PUSH_HANDLER (c, handlers, CONDITION_CASE);
- if (sys_setjmp (c->jmp))
- {
- Lisp_Object val = handlerlist->val;
- clobbered_eassert (handlerlist == c);
- handlerlist = handlerlist->next;
- return (*hfun) (val);
- }
-
- val = (*bfun) (arg1, arg2);
- clobbered_eassert (handlerlist == c);
- handlerlist = handlerlist->next;
- return val;
+ struct handler *c = make_condition_handler (handlers);
+ struct icc_thunk_env env = { .type = ICC_2,
+ .fun2 = bfun,
+ .arg1 = arg1,
+ .arg2 = arg2,
+ .c = c };
+ return call_with_prompt (c->ptag,
+ make_c_closure (icc_thunk, &env, 0, 0),
+ make_c_closure (icc_handler, hfun, 2, 0));
}
/* Like internal_condition_case but call BFUN with NARGS as first,
Lisp_Object *args))
{
Lisp_Object val;
- struct handler *c;
+ struct handler *c = make_condition_handler (handlers);
- PUSH_HANDLER (c, handlers, CONDITION_CASE);
- if (sys_setjmp (c->jmp))
- {
- Lisp_Object val = handlerlist->val;
- clobbered_eassert (handlerlist == c);
- handlerlist = handlerlist->next;
- return (*hfun) (val, nargs, args);
- }
-
- val = (*bfun) (nargs, args);
- clobbered_eassert (handlerlist == c);
- handlerlist = handlerlist->next;
- return val;
+ struct icc_thunk_env env = { .type = ICC_N,
+ .funn = bfun,
+ .nargs = nargs,
+ .args = args,
+ .c = c };
+ struct icc_handler_n_env henv = { .fun = hfun, .nargs = nargs, .args = args };
+ return call_with_prompt (c->ptag,
+ make_c_closure (icc_thunk, &env, 0, 0),
+ make_c_closure (icc_handler_n, &henv, 2, 0));
}
\f
}
else
{
- if (handlerlist != &handlerlist_sentinel)
+ if (handlerlist != handlerlist_sentinel)
/* FIXME: This will come right back here if there's no `top-level'
catcher. A better solution would be to abort here, and instead
add a catch-all condition handler so we never come here. */
it is defines a macro. */)
(Lisp_Object fundef, Lisp_Object funname, Lisp_Object macro_only)
{
- ptrdiff_t count = SPECPDL_INDEX ();
+ dynwind_begin ();
struct gcpro gcpro1, gcpro2, gcpro3;
- if (!CONSP (fundef) || !EQ (Qautoload, XCAR (fundef)))
+ if (!CONSP (fundef) || !EQ (Qautoload, XCAR (fundef))) {
+ dynwind_end ();
return fundef;
+ }
if (EQ (macro_only, Qmacro))
{
Lisp_Object kind = Fnth (make_number (4), fundef);
- if (! (EQ (kind, Qt) || EQ (kind, Qmacro)))
- return fundef;
+ if (! (EQ (kind, Qt) || EQ (kind, Qmacro))) {
+ dynwind_end ();
+ return fundef;
+ }
}
/* This is to make sure that loadup.el gives a clear picture
/* Once loading finishes, don't undo it. */
Vautoload_queue = Qt;
- unbind_to (count, Qnil);
+ dynwind_end ();
UNGCPRO;
alist mapping symbols to their value. */)
(Lisp_Object form, Lisp_Object lexical)
{
- ptrdiff_t count = SPECPDL_INDEX ();
+ dynwind_begin ();
specbind (Qinternal_interpreter_environment,
CONSP (lexical) || NILP (lexical) ? lexical : list1 (Qt));
- return unbind_to (count, eval_sub (form));
+ Lisp_Object tem0 = eval_sub (form);
+ dynwind_end ();
+ return tem0;
}
/* Grow the specpdl stack by one entry.
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)
+{
+ EMACS_INT n = (EMACS_INT) data;
+ lisp_eval_depth = n;
}
/* Eval a sub-expression of the current expression (i.e. in the same
maybe_gc ();
UNGCPRO;
+ scm_dynwind_begin (0);
+ scm_dynwind_unwind_handler (set_lisp_eval_depth,
+ (void *) lisp_eval_depth,
+ SCM_F_WIND_EXPLICITLY);
+
if (++lisp_eval_depth > max_lisp_eval_depth)
{
if (max_lisp_eval_depth < 100)
}
if (EQ (funcar, Qmacro))
{
- ptrdiff_t count = SPECPDL_INDEX ();
+ dynwind_begin ();
Lisp_Object exp;
/* Bind lexical-binding during expansion of the macro, so the
macro can know reliably if the code it outputs will be
specbind (Qlexical_binding,
NILP (Vinternal_interpreter_environment) ? Qnil : Qt);
exp = apply1 (Fcdr (fun), original_args);
- unbind_to (count, Qnil);
+ dynwind_end ();
val = eval_sub (exp);
}
else if (EQ (funcar, Qlambda)
xsignal1 (Qinvalid_function, original_fun);
}
- lisp_eval_depth--;
if (backtrace_debug_on_exit (specpdl_ptr - 1))
val = call_debugger (list2 (Qexit, val));
- specpdl_ptr--;
+ scm_dynwind_end ();
return val;
}
GCPRO1 (fn);
if (NILP (arg))
- RETURN_UNGCPRO (Ffuncall (1, &fn));
+ return Ffuncall (1, &fn);
gcpro1.nvars = 2;
{
Lisp_Object args[2];
args[0] = fn;
args[1] = arg;
gcpro1.var = args;
- RETURN_UNGCPRO (Fapply (2, args));
+ return Fapply (2, args);
}
}
struct gcpro gcpro1;
GCPRO1 (fn);
- RETURN_UNGCPRO (Ffuncall (1, &fn));
+ return Ffuncall (1, &fn);
}
/* Call function fn with 1 argument arg1. */
args[1] = arg1;
GCPRO1 (args[0]);
gcpro1.nvars = 2;
- RETURN_UNGCPRO (Ffuncall (2, args));
+ return Ffuncall (2, args);
}
/* Call function fn with 2 arguments arg1, arg2. */
args[2] = arg2;
GCPRO1 (args[0]);
gcpro1.nvars = 3;
- RETURN_UNGCPRO (Ffuncall (3, args));
+ return Ffuncall (3, args);
}
/* Call function fn with 3 arguments arg1, arg2, arg3. */
args[3] = arg3;
GCPRO1 (args[0]);
gcpro1.nvars = 4;
- RETURN_UNGCPRO (Ffuncall (4, args));
+ return Ffuncall (4, args);
}
/* Call function fn with 4 arguments arg1, arg2, arg3, arg4. */
args[4] = arg4;
GCPRO1 (args[0]);
gcpro1.nvars = 5;
- RETURN_UNGCPRO (Ffuncall (5, args));
+ return Ffuncall (5, args);
}
/* Call function fn with 5 arguments arg1, arg2, arg3, arg4, arg5. */
args[5] = arg5;
GCPRO1 (args[0]);
gcpro1.nvars = 6;
- RETURN_UNGCPRO (Ffuncall (6, args));
+ return Ffuncall (6, args);
}
/* Call function fn with 6 arguments arg1, arg2, arg3, arg4, arg5, arg6. */
args[6] = arg6;
GCPRO1 (args[0]);
gcpro1.nvars = 7;
- RETURN_UNGCPRO (Ffuncall (7, args));
+ return Ffuncall (7, args);
}
/* Call function fn with 7 arguments arg1, arg2, arg3, arg4, arg5, arg6, arg7. */
args[7] = arg7;
GCPRO1 (args[0]);
gcpro1.nvars = 8;
- RETURN_UNGCPRO (Ffuncall (8, args));
+ return Ffuncall (8, args);
}
/* The caller should GCPRO all the elements of ARGS. */
QUIT;
+ scm_dynwind_begin (0);
+ scm_dynwind_unwind_handler (set_lisp_eval_depth,
+ (void *) lisp_eval_depth,
+ SCM_F_WIND_EXPLICITLY);
+
if (++lisp_eval_depth > max_lisp_eval_depth)
{
if (max_lisp_eval_depth < 100)
else
xsignal1 (Qinvalid_function, original_fun);
}
- lisp_eval_depth--;
if (backtrace_debug_on_exit (specpdl_ptr - 1))
val = call_debugger (list2 (Qexit, val));
- specpdl_ptr--;
+ scm_dynwind_end ();
return val;
}
\f
register Lisp_Object *arg_vector)
{
Lisp_Object val, syms_left, next, lexenv;
- ptrdiff_t count = SPECPDL_INDEX ();
+ dynwind_begin ();
ptrdiff_t i;
bool optional, rest;
and constants vector yet, fetch them from the file. */
if (CONSP (AREF (fun, COMPILED_BYTECODE)))
Ffetch_bytecode (fun);
+ dynwind_end ();
return exec_byte_code (AREF (fun, COMPILED_BYTECODE),
AREF (fun, COMPILED_CONSTANTS),
AREF (fun, COMPILED_STACK_DEPTH),
Qnil, 0, 0);
}
- return unbind_to (count, val);
+ dynwind_end ();
+ return val;
}
DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode,
specpdl_ptr->let.kind = SPECPDL_LET_DEFAULT;
grow_specpdl ();
Fset_default (symbol, value);
- return;
+ goto done;
}
}
else
}
default: emacs_abort ();
}
+
+ done:
+ scm_dynwind_unwind_handler (unbind_once, NULL, SCM_F_WIND_EXPLICITLY);
}
/* Push unwind-protect entries of various types. */
void
-record_unwind_protect (void (*function) (Lisp_Object), Lisp_Object arg)
+record_unwind_protect_1 (void (*function) (Lisp_Object), Lisp_Object arg,
+ bool wind_explicitly)
{
- specpdl_ptr->unwind.kind = SPECPDL_UNWIND;
- specpdl_ptr->unwind.func = function;
- specpdl_ptr->unwind.arg = arg;
- grow_specpdl ();
+ record_unwind_protect_ptr_1 (function, arg, wind_explicitly);
}
void
-record_unwind_protect_ptr (void (*function) (void *), void *arg)
+record_unwind_protect (void (*function) (Lisp_Object), Lisp_Object arg)
{
- specpdl_ptr->unwind_ptr.kind = SPECPDL_UNWIND_PTR;
- specpdl_ptr->unwind_ptr.func = function;
- specpdl_ptr->unwind_ptr.arg = arg;
- grow_specpdl ();
+ record_unwind_protect_1 (function, arg, true);
}
void
-record_unwind_protect_int (void (*function) (int), int arg)
+record_unwind_protect_ptr_1 (void (*function) (void *), void *arg,
+ bool wind_explicitly)
{
- specpdl_ptr->unwind_int.kind = SPECPDL_UNWIND_INT;
- specpdl_ptr->unwind_int.func = function;
- specpdl_ptr->unwind_int.arg = arg;
- grow_specpdl ();
+ scm_dynwind_unwind_handler (function,
+ arg,
+ (wind_explicitly
+ ? SCM_F_WIND_EXPLICITLY
+ : 0));
}
void
-record_unwind_protect_void (void (*function) (void))
+record_unwind_protect_ptr (void (*function) (void *), void *arg)
{
- specpdl_ptr->unwind_void.kind = SPECPDL_UNWIND_VOID;
- specpdl_ptr->unwind_void.func = function;
- grow_specpdl ();
+ record_unwind_protect_ptr_1 (function, arg, true);
}
-static void
-do_nothing (void)
-{}
-
-/* Push an unwind-protect entry that does nothing, so that
- set_unwind_protect_ptr can overwrite it later. */
-
void
-record_unwind_protect_nothing (void)
+record_unwind_protect_int_1 (void (*function) (int), int arg,
+ bool wind_explicitly)
{
- record_unwind_protect_void (do_nothing);
+ record_unwind_protect_ptr_1 (function, arg, wind_explicitly);
}
-/* Clear the unwind-protect entry COUNT, so that it does nothing.
- It need not be at the top of the stack. */
-
void
-clear_unwind_protect (ptrdiff_t count)
+record_unwind_protect_int (void (*function) (int), int arg)
{
- union specbinding *p = specpdl + count;
- p->unwind_void.kind = SPECPDL_UNWIND_VOID;
- p->unwind_void.func = do_nothing;
+ record_unwind_protect_int_1 (function, arg, true);
}
-/* Set the unwind-protect entry COUNT so that it invokes FUNC (ARG).
- It need not be at the top of the stack. Discard the entry's
- previous value without invoking it. */
+static void
+call_void (void *data)
+{
+ ((void (*) (void)) data) ();
+}
void
-set_unwind_protect (ptrdiff_t count, void (*func) (Lisp_Object),
- Lisp_Object arg)
+record_unwind_protect_void_1 (void (*function) (void),
+ bool wind_explicitly)
{
- union specbinding *p = specpdl + count;
- p->unwind.kind = SPECPDL_UNWIND;
- p->unwind.func = func;
- p->unwind.arg = arg;
+ record_unwind_protect_ptr_1 (call_void, function, wind_explicitly);
}
void
-set_unwind_protect_ptr (ptrdiff_t count, void (*func) (void *), void *arg)
+record_unwind_protect_void (void (*function) (void))
{
- union specbinding *p = specpdl + count;
- p->unwind_ptr.kind = SPECPDL_UNWIND_PTR;
- p->unwind_ptr.func = func;
- p->unwind_ptr.arg = arg;
+ record_unwind_protect_void_1 (function, true);
}
-void
-unbind_once (void)
+static void
+unbind_once (void *ignore)
{
/* Decrement specpdl_ptr before we do the work to unbind it, so
that an error in unbinding won't try to unbind the same entry
switch (specpdl_ptr->kind)
{
- case SPECPDL_UNWIND:
- specpdl_ptr->unwind.func (specpdl_ptr->unwind.arg);
- break;
- case SPECPDL_UNWIND_PTR:
- specpdl_ptr->unwind_ptr.func (specpdl_ptr->unwind_ptr.arg);
- break;
- case SPECPDL_UNWIND_INT:
- specpdl_ptr->unwind_int.func (specpdl_ptr->unwind_int.arg);
- break;
- case SPECPDL_UNWIND_VOID:
- specpdl_ptr->unwind_void.func ();
- break;
case SPECPDL_BACKTRACE:
break;
case SPECPDL_LET:
}
}
-/* Pop and execute entries from the unwind-protect stack until the
- depth COUNT is reached. Return VALUE. */
-
-Lisp_Object
-unbind_to (ptrdiff_t count, Lisp_Object value)
+void
+dynwind_begin (void)
{
- Lisp_Object quitf = Vquit_flag;
- struct gcpro gcpro1, gcpro2;
-
- GCPRO2 (value, quitf);
- Vquit_flag = Qnil;
-
- while (specpdl_ptr != specpdl + count)
- unbind_once ();
-
- if (NILP (Vquit_flag) && !NILP (quitf))
- Vquit_flag = quitf;
+ scm_dynwind_begin (0);
+}
- UNGCPRO;
- return value;
+void
+dynwind_end (void)
+{
+ scm_dynwind_end ();
}
DEFUN ("special-variable-p", Fspecial_variable_p, Sspecial_variable_p, 1, 1, 0,
/* */
switch (tmp->kind)
{
- /* FIXME: Ideally we'd like to "temporarily unwind" (some of) those
- unwind_protect, but the problem is that we don't know how to
- rewind them afterwards. */
- case SPECPDL_UNWIND:
- case SPECPDL_UNWIND_PTR:
- case SPECPDL_UNWIND_INT:
- case SPECPDL_UNWIND_VOID:
case SPECPDL_BACKTRACE:
break;
case SPECPDL_LET:
(Lisp_Object exp, Lisp_Object nframes, Lisp_Object base)
{
union specbinding *pdl = get_backtrace_frame (nframes, base);
- ptrdiff_t count = SPECPDL_INDEX ();
+ dynwind_begin ();
ptrdiff_t distance = specpdl_ptr - pdl;
eassert (distance >= 0);
/* 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. */
- return unbind_to (count, eval_sub (exp));
+ Lisp_Object tem1 = eval_sub (exp);
+ dynwind_end ();
+ return tem1;
}
DEFUN ("backtrace--locals", Fbacktrace__locals, Sbacktrace__locals, 1, 2, NULL,
union specbinding *pdl = backtrace_top ();
return (backtrace_p (pdl) ? backtrace_function (pdl) : Qnil);
}
+\f
+_Noreturn SCM
+abort_to_prompt (SCM tag, SCM arglst)
+{
+ static SCM var = SCM_UNDEFINED;
+ if (SCM_UNBNDP (var))
+ var = scm_c_public_lookup ("guile", "abort-to-prompt");
+
+ scm_apply_1 (scm_variable_ref (var), tag, arglst);
+ emacs_abort ();
+}
+SCM
+call_with_prompt (SCM tag, SCM thunk, SCM handler)
+{
+ static SCM var = SCM_UNDEFINED;
+ if (SCM_UNBNDP (var))
+ var = scm_c_public_lookup ("guile", "call-with-prompt");
+
+ return scm_call_3 (scm_variable_ref (var), tag, thunk, handler);
+}
+
+SCM
+make_prompt_tag (void)
+{
+ static SCM var = SCM_UNDEFINED;
+ if (SCM_UNBNDP (var))
+ var = scm_c_public_lookup ("guile", "make-prompt-tag");
+
+ return scm_call_0 (scm_variable_ref (var));
+}
+\f
void
syms_of_eval (void)
{