-/* classes: h_files */
-
-#ifndef CONTINUATIONSH
-#define CONTINUATIONSH
-/* Copyright (C) 1995,1996, 2000 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 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.
- *
- * 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. */
-\f
-#include "libguile/__scm.h"
-
-\f
-
-typedef struct
-{
- SCM throw_value;
- jmp_buf jmpbuf;
- SCM dynenv;
- SCM_STACKITEM *base;
- unsigned long seq;
-
-#ifdef DEBUG_EXTENSIONS
- struct scm_debug_frame *dframe;
-#endif
-} scm_contregs;
-
-
-#define SCM_CONTREGS(x) ((scm_contregs *) SCM_CELL_WORD_1 (x))
-#define SCM_SET_CONTREGS(x, r) (SCM_SET_CELL_WORD_1 ((x), (scm_bits_t) (r)))
-#define SCM_CONTINUATION_LENGTH(x) (((unsigned long) SCM_CELL_WORD_0 (x)) >> 8)
-#define SCM_SET_CONTINUATION_LENGTH(x, l) (SCM_SET_CELL_WORD_0 ((x), ((l) << 8) + scm_tc7_contin))
-
-#define SCM_JMPBUF(x) ((SCM_CONTREGS (x))->jmpbuf)
-#define SCM_DYNENV(x) ((SCM_CONTREGS (x))->dynenv)
-#define SCM_THROW_VALUE(x) ((SCM_CONTREGS (x))->throw_value)
-#define SCM_BASE(x) ((SCM_CONTREGS (x))->base)
-#define SCM_SEQ(x) ((SCM_CONTREGS (x))->seq)
-#define SCM_DFRAME(x) ((SCM_CONTREGS (x))->dframe)
-
-\f
-
-extern SCM scm_make_cont (SCM * answer);
-extern SCM scm_call_continuation (SCM cont, SCM val);
-extern void scm_init_continuations (void);
-
-\f
-
-#if (SCM_DEBUG_DEPRECATED == 0)
-
-#define SCM_SETJMPBUF(x, r) (SCM_SET_CONTREGS ((x), (r)))
-
-#endif /* SCM_DEBUG_DEPRECATED == 0 */
-
-#endif /* CONTINUATIONSH */
-
-/*
- Local Variables:
- c-file-style: "gnu"
- End:
-*/
+/* classes: h_files */
+
+#ifndef SCM_CONTINUATIONS_H
+#define SCM_CONTINUATIONS_H
+
+/* Copyright (C) 1995,1996,2000,2001 Free Software Foundation, Inc.
+ *
+ * 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 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.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+\f
+
+#include "libguile/__scm.h"
+
+#ifdef __ia64__
+#include <signal.h>
+#include <ucontext.h>
+extern unsigned long * __libc_ia64_register_backing_store_base;
+#endif /* __ia64__ */
+\f
+
+/* a continuation SCM is a non-immediate pointing to a heap cell with:
+ word 0: bits 0-15: smob type tag: scm_tc16_continuation.
+ bits 16-31: unused.
+ word 1: malloc block containing an scm_t_contregs structure with a
+ tail array of SCM_STACKITEM. the size of the array is stored
+ in the num_stack_items field of the structure.
+*/
+
+SCM_API scm_t_bits scm_tc16_continuation;
+
+typedef struct
+{
+ SCM throw_value;
+ jmp_buf jmpbuf;
+ SCM dynenv;
+#ifdef __ia64__
+ ucontext_t ctx;
+ void *backing_store;
+ unsigned long backing_store_size;
+#endif /* __ia64__ */
+ size_t num_stack_items; /* size of the saved stack. */
+ SCM root; /* continuation root identifier. */
+
+ /* The offset from the live stack location to this copy. This is
+ used to adjust pointers from within the copied stack to the stack
+ itself.
+
+ Thus, when you read a pointer from the copied stack that points
+ into the live stack, you need to add OFFSET so that it points
+ into the copy.
+ */
+ scm_t_ptrdiff offset;
+
+ /* The most recently created debug frame on the live stack, before
+ it was saved. This needs to be adjusted with OFFSET, above.
+ */
+ struct scm_t_debug_frame *dframe;
+
+ SCM_STACKITEM stack[1]; /* copied stack of size num_stack_items. */
+} scm_t_contregs;
+
+#define SCM_CONTINUATIONP(x) SCM_TYP16_PREDICATE (scm_tc16_continuation, x)
+
+#define SCM_CONTREGS(x) ((scm_t_contregs *) SCM_CELL_WORD_1 (x))
+
+#define SCM_CONTINUATION_LENGTH(x) (SCM_CONTREGS (x)->num_stack_items)
+#define SCM_SET_CONTINUATION_LENGTH(x, n)\
+ (SCM_CONTREGS (x)->num_stack_items = (n))
+#define SCM_JMPBUF(x) ((SCM_CONTREGS (x))->jmpbuf)
+#define SCM_DYNENV(x) ((SCM_CONTREGS (x))->dynenv)
+#define SCM_THROW_VALUE(x) ((SCM_CONTREGS (x))->throw_value)
+#define SCM_CONTINUATION_ROOT(x) ((SCM_CONTREGS (x))->root)
+#define SCM_DFRAME(x) ((SCM_CONTREGS (x))->dframe)
+
+\f
+
+SCM_API SCM scm_make_continuation (int *first);
+
+SCM_API void *scm_c_with_continuation_barrier (void *(*func)(void*), void *);
+SCM_API SCM scm_with_continuation_barrier (SCM proc);
+
+SCM_API SCM scm_i_with_continuation_barrier (scm_t_catch_body body,
+ void *body_data,
+ scm_t_catch_handler handler,
+ void *handler_data);
+
+SCM_API void scm_init_continuations (void);
+
+#endif /* SCM_CONTINUATIONS_H */
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff