-/* Copyright (C) 1995,1996,1998, 2000 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1998,2000,2001 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
-/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
- gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
\f
-#include <stdio.h>
+#include <string.h>
+
#include "libguile/_scm.h"
#include "libguile/root.h"
#include "libguile/stackchk.h"
#include "libguile/debug.h"
#endif
+#include "libguile/validate.h"
#include "libguile/continuations.h"
\f
/* {Continuations}
*/
-scm_bits_t scm_tc16_continuation;
+scm_t_bits scm_tc16_continuation;
-static SCM continuation_mark (SCM obj)
+static SCM
+continuation_mark (SCM obj)
{
- scm_contregs *continuation = SCM_CONTREGS (obj);
+ scm_t_contregs *continuation = SCM_CONTREGS (obj);
scm_gc_mark (continuation->throw_value);
scm_mark_locations (continuation->stack, continuation->num_stack_items);
+#ifdef __ia64__
+ if (continuation->backing_store)
+ scm_mark_locations (continuation->backing_store,
+ continuation->backing_store_size /
+ sizeof (SCM_STACKITEM));
+#endif /* __ia64__ */
return continuation->dynenv;
}
-static scm_sizet continuation_free (SCM obj)
+static size_t
+continuation_free (SCM obj)
{
- scm_contregs *continuation = SCM_CONTREGS (obj);
+ scm_t_contregs *continuation = SCM_CONTREGS (obj);
/* stack array size is 1 if num_stack_items is 0 (rootcont). */
- scm_sizet extra_items = (continuation->num_stack_items > 0)
+ size_t extra_items = (continuation->num_stack_items > 0)
? (continuation->num_stack_items - 1)
: 0;
- scm_sizet bytes_free = sizeof (scm_contregs)
+ size_t bytes_free = sizeof (scm_t_contregs)
+ extra_items * sizeof (SCM_STACKITEM);
-
- scm_must_free (continuation);
- return bytes_free;
+
+#ifdef __ia64__
+ scm_gc_free (continuation->backing_store, continuation->backing_store_size,
+ "continuation backing store");
+#endif /* __ia64__ */
+ scm_gc_free (continuation, bytes_free, "continuation");
+ return 0;
}
-static int continuation_print (SCM obj, SCM port, scm_print_state *state)
+static int
+continuation_print (SCM obj, SCM port, scm_print_state *state SCM_UNUSED)
{
- scm_contregs *continuation = SCM_CONTREGS (obj);
+ scm_t_contregs *continuation = SCM_CONTREGS (obj);
scm_puts ("#<continuation ", port);
scm_intprint (continuation->num_stack_items, 10, port);
return 1;
}
+#ifdef __ia64__
+/* Extern declaration of getcontext()/setcontext() in order to redefine
+ getcontext() since on ia64-linux the second return value indicates whether
+ it returned from getcontext() itself or by running setcontext(). */
+struct rv
+{
+ long retval;
+ long first_return;
+};
+extern struct rv getcontext (ucontext_t *);
+extern int setcontext (ucontext_t *);
+#endif /* __ia64__ */
+
/* this may return more than once: the first time with the escape
procedure, then subsequently with the value to be passed to the
continuation. */
SCM
scm_make_continuation (int *first)
{
- SCM cont;
- scm_contregs *continuation;
- scm_contregs *rootcont = SCM_CONTREGS (scm_rootcont);
+ volatile SCM cont;
+ scm_t_contregs *continuation;
+ scm_t_contregs *rootcont = SCM_CONTREGS (scm_rootcont);
long stack_size;
SCM_STACKITEM * src;
+#ifdef __ia64__
+ struct rv rv;
+#endif /* __ia64__ */
SCM_ENTER_A_SECTION;
SCM_FLUSH_REGISTER_WINDOWS;
stack_size = scm_stack_size (rootcont->base);
- continuation = scm_must_malloc (sizeof (scm_contregs)
- + (stack_size - 1) * sizeof (SCM_STACKITEM),
- FUNC_NAME);
+ continuation = scm_gc_malloc (sizeof (scm_t_contregs)
+ + (stack_size - 1) * sizeof (SCM_STACKITEM),
+ "continuation");
continuation->num_stack_items = stack_size;
continuation->dynenv = scm_dynwinds;
continuation->throw_value = SCM_EOL;
#endif
memcpy (continuation->stack, src, sizeof (SCM_STACKITEM) * stack_size);
+#ifdef __ia64__
+ rv = getcontext (&continuation->ctx);
+ if (rv.first_return)
+ {
+ continuation->backing_store_size =
+ continuation->ctx.uc_mcontext.sc_ar_bsp -
+ (unsigned long) __libc_ia64_register_backing_store_base;
+ continuation->backing_store = NULL;
+ continuation->backing_store =
+ scm_gc_malloc (continuation->backing_store_size,
+ "continuation backing store");
+ memcpy (continuation->backing_store,
+ (void *) __libc_ia64_register_backing_store_base,
+ continuation->backing_store_size);
+ *first = 1;
+ return cont;
+ }
+ else
+ {
+ SCM ret = continuation->throw_value;
+ *first = 0;
+ continuation->throw_value = SCM_BOOL_F;
+ return ret;
+ }
+#else /* !__ia64__ */
if (setjmp (continuation->jmpbuf))
{
+ SCM ret = continuation->throw_value;
*first = 0;
- return continuation->throw_value;
+ continuation->throw_value = SCM_BOOL_F;
+ return ret;
}
else
{
*first = 1;
return cont;
}
+#endif /* !__ia64__ */
}
#undef FUNC_NAME
* variable.
*/
-scm_bits_t scm_i_dummy;
+scm_t_bits scm_i_dummy;
static void
grow_stack (SCM cont, SCM val)
{
- scm_bits_t growth[100];
+ scm_t_bits growth[100];
- scm_i_dummy = (scm_bits_t) growth;
+ scm_i_dummy = (scm_t_bits) growth;
scm_dynthrow (cont, val);
}
* own frame are overwritten. Thus, memcpy can be used for best performance.
*/
static void
-copy_stack_and_call (scm_contregs *continuation, SCM val,
+copy_stack_and_call (scm_t_contregs *continuation, SCM val,
SCM_STACKITEM * dst)
{
memcpy (dst, continuation->stack,
#endif
continuation->throw_value = val;
+#ifdef __ia64__
+ memcpy ((void *) __libc_ia64_register_backing_store_base,
+ continuation->backing_store,
+ continuation->backing_store_size);
+ setcontext (&continuation->ctx);
+#else
longjmp (continuation->jmpbuf, 1);
+#endif
}
static void
scm_dynthrow (SCM cont, SCM val)
{
- scm_contregs *continuation = SCM_CONTREGS (cont);
+ scm_t_contregs *continuation = SCM_CONTREGS (cont);
SCM_STACKITEM * dst = SCM_BASE (scm_rootcont);
SCM_STACKITEM stack_top_element;
copy_stack_and_call (continuation, val, dst);
}
+
+static SCM
+continuation_apply (SCM cont, SCM args)
#define FUNC_NAME "continuation_apply"
-static SCM continuation_apply (SCM cont, SCM args)
{
- scm_contregs *continuation = SCM_CONTREGS (cont);
- scm_contregs *rootcont = SCM_CONTREGS (scm_rootcont);
+ scm_t_contregs *continuation = SCM_CONTREGS (cont);
+ scm_t_contregs *rootcont = SCM_CONTREGS (scm_rootcont);
if (continuation->seq != rootcont->seq
/* this base comparison isn't needed */
|| continuation->base != rootcont->base)
{
- scm_wta (cont, "continuation from wrong top level", FUNC_NAME);
+ SCM_MISC_ERROR ("continuation from wrong top level: ~S",
+ scm_list_1 (cont));
}
scm_dowinds (continuation->dynenv,
- scm_ilength (scm_dynwinds) - continuation->dynenv);
+ scm_ilength (scm_dynwinds)
+ - scm_ilength (continuation->dynenv));
scm_dynthrow (cont, scm_values (args));
return SCM_UNSPECIFIED; /* not reached */
}
#undef FUNC_NAME
+
void
scm_init_continuations ()
{
scm_set_smob_free (scm_tc16_continuation, continuation_free);
scm_set_smob_print (scm_tc16_continuation, continuation_print);
scm_set_smob_apply (scm_tc16_continuation, continuation_apply, 0, 0, 1);
-
#ifndef SCM_MAGIC_SNARFER
#include "libguile/continuations.x"
#endif
HCoop / bpt / guile.git / blobdiff