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authorKeisuke Nishida <kxn30@po.cwru.edu>2001-04-22 02:13:48 +0000
committerKeisuke Nishida <kxn30@po.cwru.edu>2001-04-22 02:13:48 +0000
commitac99cb0cb153b1691b48115f098a0008b78f9702 (patch)
tree61097ad9a9ceff1f371dd927a02430bc81ea079b /src/frames.h
parentac02b386c2e5743b6ea96486af6ba2cc6583c12a (diff)
downloadguile-ac99cb0cb153b1691b48115f098a0008b78f9702.tar.gz
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+/* Copyright (C) 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 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. */
+
+#ifndef _SCM_FRAMES_H_
+#define _SCM_FRAMES_H_
+
+#include <libguile.h>
+#include "config.h"
+#include "programs.h"
+
+/*
+ * VM Address
+ */
+
+#define SCM_VM_MAKE_STACK_ADDRESS(ptr) SCM_PACK (ptr)
+#define SCM_VM_STACK_ADDRESS(addr) ((SCM *) SCM_UNPACK (addr))
+
+#define SCM_VM_MAKE_BYTE_ADDRESS(ptr) SCM_PACK (ptr)
+#define SCM_VM_BYTE_ADDRESS(addr) ((scm_byte_t *) SCM_UNPACK (addr))
+
+
+/*
+ * VM Stack frames
+ */
+
+/* Stack frames are allocated on the VM stack as follows:
+
+ | | <- fp + bp->nargs + bp->nlocs + 3
+ +------------------+ = SCM_STACK_FRAME_UPPER_ADDRESS (fp)
+ | Return address |
+ | Dynamic link |
+ | External link | <- fp + bp->nargs + bp->nlocs
+ | Local varialbe 1 | = SCM_STACK_FRAME_DATA_ADDRESS (fp)
+ | Local variable 0 | <- fp + bp->nargs
+ | Argument 1 |
+ | Argument 0 | <- fp
+ | Program | <- fp - 1
+ +------------------+ = SCM_STACK_FRAME_LOWER_ADDRESS (fp)
+ | |
+*/
+
+#define SCM_STACK_FRAME_DATA_ADDRESS(fp) \
+ (fp + SCM_PROGRAM_DATA (SCM_STACK_FRAME_PROGRAM (fp))->nargs \
+ + SCM_PROGRAM_DATA (SCM_STACK_FRAME_PROGRAM (fp))->nlocs)
+#define SCM_STACK_FRAME_UPPER_ADDRESS(fp) \
+ (SCM_STACK_FRAME_DATA_ADDRESS (fp) + 3)
+#define SCM_STACK_FRAME_LOWER_ADDRESS(fp) (fp - 1)
+
+#define SCM_STACK_FRAME_RETURN_ADDRESS(fp) SCM_STACK_FRAME_DATA_ADDRESS (fp)[2]
+#define SCM_STACK_FRAME_DYNAMIC_LINK(fp) SCM_STACK_FRAME_DATA_ADDRESS (fp)[1]
+#define SCM_STACK_FRAME_EXTERNAL_LINK(fp) SCM_STACK_FRAME_DATA_ADDRESS (fp)[0]
+#define SCM_STACK_FRAME_VARIABLE(fp,i) fp[i]
+#define SCM_STACK_FRAME_PROGRAM(fp) fp[-1]
+
+
+/*
+ * VM Heap frames
+ */
+
+struct scm_heap_frame {
+ SCM *fp;
+ SCM program;
+ SCM variables;
+ SCM dynamic_link;
+ SCM external_link;
+};
+
+extern scm_bits_t scm_tc16_heap_frame;
+
+#define SCM_HEAP_FRAME_P(x) SCM_SMOB_PREDICATE (scm_tc16_heap_frame, x)
+#define SCM_HEAP_FRAME_DATA(f) ((struct scm_heap_frame *) SCM_SMOB_DATA (f))
+#define SCM_VALIDATE_HEAP_FRAME(p,x) SCM_MAKE_VALIDATE (p, x, HEAP_FRAME_P)
+
+#define SCM_HEAP_FRAME_PROGRAM(f) SCM_HEAP_FRAME_DATA (f)->program
+#define SCM_HEAP_FRAME_VARIABLES(f) SCM_HEAP_FRAME_DATA (f)->variables
+#define SCM_HEAP_FRAME_DYNAMIC_LINK(f) SCM_HEAP_FRAME_DATA (f)->dynamic_link
+#define SCM_HEAP_FRAME_EXTERNAL_LINK(f) SCM_HEAP_FRAME_DATA (f)->external_link
+
+extern SCM scm_c_make_heap_frame (SCM *fp);
+extern void scm_init_frames (void);
+
+#endif /* _SCM_FRAMES_H_ */
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/