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Diffstat (limited to 'src/frames.c')
| -rw-r--r-- | src/frames.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/src/frames.c b/src/frames.c new file mode 100644 index 000000000..c25c9f677 --- /dev/null +++ b/src/frames.c @@ -0,0 +1,190 @@ +/* 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. */ + +#if HAVE_CONFIG_H +# include <config.h> +#endif + +#include <string.h> +#include "frames.h" + + +scm_t_bits scm_tc16_heap_frame; + +SCM +scm_c_make_heap_frame (SCM *fp) +{ + SCM frame; + SCM *lower = SCM_FRAME_LOWER_ADDRESS (fp); + SCM *upper = SCM_FRAME_UPPER_ADDRESS (fp); + size_t size = sizeof (SCM) * (upper - lower + 1); + SCM *p = scm_gc_malloc (size, "frame"); + + SCM_NEWSMOB (frame, scm_tc16_heap_frame, p); + p[0] = frame; /* self link */ + memcpy (p + 1, lower, size - sizeof (SCM)); + + return frame; +} + +static SCM +heap_frame_mark (SCM obj) +{ + SCM *sp; + SCM *fp = SCM_HEAP_FRAME_POINTER (obj); + SCM *limit = &SCM_FRAME_HEAP_LINK (fp); + + for (sp = SCM_FRAME_LOWER_ADDRESS (fp); sp <= limit; sp++) + if (SCM_NIMP (*sp)) + scm_gc_mark (*sp); + + return SCM_BOOL_F; +} + +static scm_sizet +heap_frame_free (SCM obj) +{ + SCM *fp = SCM_HEAP_FRAME_POINTER (obj); + SCM *lower = SCM_FRAME_LOWER_ADDRESS (fp); + SCM *upper = SCM_FRAME_UPPER_ADDRESS (fp); + size_t size = sizeof (SCM) * (upper - lower + 1); + + scm_gc_free (SCM_HEAP_FRAME_DATA (obj), size, "frame"); + + return 0; +} + +/* Scheme interface */ + +SCM_DEFINE (scm_frame_p, "frame?", 1, 0, 0, + (SCM obj), + "") +#define FUNC_NAME s_scm_frame_p +{ + return SCM_BOOL (SCM_HEAP_FRAME_P (obj)); +} +#undef FUNC_NAME + +SCM_DEFINE (scm_frame_program, "frame-program", 1, 0, 0, + (SCM frame), + "") +#define FUNC_NAME s_scm_frame_program +{ + SCM_VALIDATE_HEAP_FRAME (1, frame); + return SCM_FRAME_PROGRAM (SCM_HEAP_FRAME_POINTER (frame)); +} +#undef FUNC_NAME + +SCM_DEFINE (scm_frame_local_ref, "frame-local-ref", 2, 0, 0, + (SCM frame, SCM index), + "") +#define FUNC_NAME s_scm_frame_local_ref +{ + SCM_VALIDATE_HEAP_FRAME (1, frame); + SCM_MAKE_VALIDATE (2, index, I_INUMP); /* FIXME: Check the range! */ + return SCM_FRAME_VARIABLE (SCM_HEAP_FRAME_POINTER (frame), + SCM_I_INUM (index)); +} +#undef FUNC_NAME + +SCM_DEFINE (scm_frame_local_set_x, "frame-local-set!", 3, 0, 0, + (SCM frame, SCM index, SCM val), + "") +#define FUNC_NAME s_scm_frame_local_set_x +{ + SCM_VALIDATE_HEAP_FRAME (1, frame); + SCM_MAKE_VALIDATE (2, index, I_INUMP); /* FIXME: Check the range! */ + SCM_FRAME_VARIABLE (SCM_HEAP_FRAME_POINTER (frame), + SCM_I_INUM (index)) = val; + return SCM_UNSPECIFIED; +} +#undef FUNC_NAME + +SCM_DEFINE (scm_frame_return_address, "frame-return-address", 1, 0, 0, + (SCM frame), + "") +#define FUNC_NAME s_scm_frame_return_address +{ + SCM_VALIDATE_HEAP_FRAME (1, frame); + return scm_from_ulong ((unsigned long) + (SCM_FRAME_RETURN_ADDRESS + (SCM_HEAP_FRAME_POINTER (frame)))); +} +#undef FUNC_NAME + +SCM_DEFINE (scm_frame_dynamic_link, "frame-dynamic-link", 1, 0, 0, + (SCM frame), + "") +#define FUNC_NAME s_scm_frame_dynamic_link +{ + SCM_VALIDATE_HEAP_FRAME (1, frame); + return SCM_FRAME_HEAP_LINK (SCM_HEAP_FRAME_POINTER (frame)); +} +#undef FUNC_NAME + +SCM_DEFINE (scm_frame_external_link, "frame-external-link", 1, 0, 0, + (SCM frame), + "") +#define FUNC_NAME s_scm_frame_external_link +{ + SCM_VALIDATE_HEAP_FRAME (1, frame); + return SCM_FRAME_EXTERNAL_LINK (SCM_HEAP_FRAME_POINTER (frame)); +} +#undef FUNC_NAME + + +void +scm_init_frames (void) +{ + scm_tc16_heap_frame = scm_make_smob_type ("frame", 0); + scm_set_smob_mark (scm_tc16_heap_frame, heap_frame_mark); + scm_set_smob_free (scm_tc16_heap_frame, heap_frame_free); + +#ifndef SCM_MAGIC_SNARFER +#include "frames.x" +#endif +} + +/* + Local Variables: + c-file-style: "gnu" + End: +*/ |