-/* 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
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this software; see the file COPYING. If not, write to
- * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- * Boston, MA 02111-1307 USA
- *
- * As a special exception, the Free Software Foundation gives permission
- * for additional uses of the text contained in its release of GUILE.
- *
- * The exception is that, if you link the GUILE library with other files
- * to produce an executable, this does not by itself cause the
- * resulting executable to be covered by the GNU General Public License.
- * Your use of that executable is in no way restricted on account of
- * linking the GUILE library code into it.
- *
- * This exception does not however invalidate any other reasons why
- * the executable file might be covered by the GNU General Public License.
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This exception applies only to the code released by the
- * Free Software Foundation under the name GUILE. If you copy
- * code from other Free Software Foundation releases into a copy of
- * GUILE, as the General Public License permits, the exception does
- * not apply to the code that you add in this way. To avoid misleading
- * anyone as to the status of such modified files, you must delete
- * this exception notice from them.
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
*
- * If you write modifications of your own for GUILE, it is your choice
- * whether to permit this exception to apply to your modifications.
- * If you do not wish that, delete this exception notice. */
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
-/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
- gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
\f
+#include "libguile/_scm.h"
+
#include <string.h>
-#include "libguile/_scm.h"
+#include "libguile/debug.h"
#include "libguile/root.h"
#include "libguile/stackchk.h"
#include "libguile/smob.h"
#include "libguile/dynwind.h"
#include "libguile/values.h"
-#ifdef DEBUG_EXTENSIONS
-#include "libguile/debug.h"
-#endif
-
#include "libguile/validate.h"
#include "libguile/continuations.h"
/* {Continuations}
*/
-scm_bits_t scm_tc16_continuation;
+scm_t_bits scm_tc16_continuation;
static SCM
continuation_mark (SCM obj)
{
- scm_contregs_t *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 size_t
continuation_free (SCM obj)
{
- scm_contregs_t *continuation = SCM_CONTREGS (obj);
+ scm_t_contregs *continuation = SCM_CONTREGS (obj);
/* stack array size is 1 if num_stack_items is 0 (rootcont). */
size_t extra_items = (continuation->num_stack_items > 0)
? (continuation->num_stack_items - 1)
: 0;
- size_t bytes_free = sizeof (scm_contregs_t)
+ 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)
+continuation_print (SCM obj, SCM port, scm_print_state *state SCM_UNUSED)
{
- scm_contregs_t *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 ia64_getcontext (ucontext_t *) __asm__ ("getcontext");
+#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_make_continuation (int *first)
{
volatile SCM cont;
- scm_contregs_t *continuation;
- scm_contregs_t *rootcont = SCM_CONTREGS (scm_rootcont);
+ 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_t)
- + (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;
continuation->base = src = rootcont->base;
continuation->seq = rootcont->seq;
-#ifdef DEBUG_EXTENSIONS
continuation->dframe = scm_last_debug_frame;
-#endif
SCM_NEWSMOB (cont, scm_tc16_continuation, continuation);
SCM_EXIT_A_SECTION;
-#ifndef SCM_STACK_GROWS_UP
+#if ! SCM_STACK_GROWS_UP
src -= stack_size;
#endif
memcpy (continuation->stack, src, sizeof (SCM_STACKITEM) * stack_size);
+#ifdef __ia64__
+ rv = ia64_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
+
+/* Invoking a continuation proceeds as follows:
+ *
+ * - the stack is made large enough for the called continuation
+ * - the old windchain is unwound down to the branching point
+ * - the continuation stack is copied into place
+ * - the windchain is rewound up to the continuation's context
+ * - the continuation is invoked via longjmp (or setcontext)
+ *
+ * This order is important so that unwind and rewind handlers are run
+ * with their correct stack.
+ */
+
static void scm_dynthrow (SCM, SCM);
/* Grow the stack by a fixed amount to provide space to copy in the
* 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);
}
* within this function is safe, since only stack frames below this function's
* own frame are overwritten. Thus, memcpy can be used for best performance.
*/
+
+typedef struct {
+ scm_t_contregs *continuation;
+ SCM_STACKITEM *dst;
+} copy_stack_data;
+
static void
-copy_stack_and_call (scm_contregs_t *continuation, SCM val,
+copy_stack (void *data)
+{
+ copy_stack_data *d = (copy_stack_data *)data;
+ memcpy (d->dst, d->continuation->stack,
+ sizeof (SCM_STACKITEM) * d->continuation->num_stack_items);
+}
+
+static void
+copy_stack_and_call (scm_t_contregs *continuation, SCM val,
SCM_STACKITEM * dst)
{
- memcpy (dst, continuation->stack,
- sizeof (SCM_STACKITEM) * continuation->num_stack_items);
+ long delta;
+ copy_stack_data data;
+
+ delta = scm_ilength (scm_dynwinds) - scm_ilength (continuation->dynenv);
+ data.continuation = continuation;
+ data.dst = dst;
+ scm_i_dowinds (continuation->dynenv, delta, copy_stack, &data);
-#ifdef DEBUG_EXTENSIONS
scm_last_debug_frame = continuation->dframe;
-#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
}
-
/* Call grow_stack until the stack space is large enough, then, as the current
* stack frame might get overwritten, let copy_stack_and_call perform the
* actual copying and continuation calling.
static void
scm_dynthrow (SCM cont, SCM val)
{
- scm_contregs_t *continuation = SCM_CONTREGS (cont);
+ scm_t_contregs *continuation = SCM_CONTREGS (cont);
SCM_STACKITEM * dst = SCM_BASE (scm_rootcont);
SCM_STACKITEM stack_top_element;
-#ifdef SCM_STACK_GROWS_UP
+#if SCM_STACK_GROWS_UP
if (SCM_PTR_GE (dst + continuation->num_stack_items, &stack_top_element))
grow_stack (cont, val);
#else
dst -= continuation->num_stack_items;
- if (SCM_PTR_LE (dst, &stack_top_element))
+ if (dst <= &stack_top_element)
grow_stack (cont, val);
#endif /* def SCM_STACK_GROWS_UP */
continuation_apply (SCM cont, SCM args)
#define FUNC_NAME "continuation_apply"
{
- scm_contregs_t *continuation = SCM_CONTREGS (cont);
- scm_contregs_t *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_MISC_ERROR ("continuation from wrong top level: ~S",
- SCM_LIST1 (cont));
+ scm_list_1 (cont));
}
- scm_dowinds (continuation->dynenv,
- scm_ilength (scm_dynwinds)
- - scm_ilength (continuation->dynenv));
-
scm_dynthrow (cont, scm_values (args));
return SCM_UNSPECIFIED; /* not reached */
}
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