| 1 | /* classes: h_files */ |
| 2 | |
| 3 | #ifndef STACKSH |
| 4 | #define STACKSH |
| 5 | /* Copyright (C) 1995,1996 Free Software Foundation |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2, or (at your option) |
| 10 | * any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this software; see the file COPYING. If not, write to |
| 19 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
| 20 | * Boston, MA 02111-1307 USA |
| 21 | * |
| 22 | * As a special exception, the Free Software Foundation gives permission |
| 23 | * for additional uses of the text contained in its release of GUILE. |
| 24 | * |
| 25 | * The exception is that, if you link the GUILE library with other files |
| 26 | * to produce an executable, this does not by itself cause the |
| 27 | * resulting executable to be covered by the GNU General Public License. |
| 28 | * Your use of that executable is in no way restricted on account of |
| 29 | * linking the GUILE library code into it. |
| 30 | * |
| 31 | * This exception does not however invalidate any other reasons why |
| 32 | * the executable file might be covered by the GNU General Public License. |
| 33 | * |
| 34 | * This exception applies only to the code released by the |
| 35 | * Free Software Foundation under the name GUILE. If you copy |
| 36 | * code from other Free Software Foundation releases into a copy of |
| 37 | * GUILE, as the General Public License permits, the exception does |
| 38 | * not apply to the code that you add in this way. To avoid misleading |
| 39 | * anyone as to the status of such modified files, you must delete |
| 40 | * this exception notice from them. |
| 41 | * |
| 42 | * If you write modifications of your own for GUILE, it is your choice |
| 43 | * whether to permit this exception to apply to your modifications. |
| 44 | * If you do not wish that, delete this exception notice. |
| 45 | * |
| 46 | * The author can be reached at djurfeldt@nada.kth.se |
| 47 | * Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN */ |
| 48 | \f |
| 49 | |
| 50 | #include "libguile/__scm.h" |
| 51 | |
| 52 | /* {Frames and stacks} |
| 53 | */ |
| 54 | |
| 55 | typedef struct scm_info_frame { |
| 56 | SCM flags; |
| 57 | SCM source; |
| 58 | SCM proc; |
| 59 | SCM args; |
| 60 | } scm_info_frame; |
| 61 | #define SCM_FRAME_N_SLOTS (sizeof (scm_info_frame) / sizeof (SCM)) |
| 62 | |
| 63 | #define SCM_STACK(obj) ((scm_stack *) SCM_STRUCT_DATA (obj)) |
| 64 | #define SCM_STACK_LAYOUT "pwuourpW" |
| 65 | typedef struct scm_stack { |
| 66 | SCM id; /* Stack id */ |
| 67 | scm_info_frame *frames; /* Info frames */ |
| 68 | unsigned int length; /* Stack length */ |
| 69 | unsigned int tail_length; |
| 70 | scm_info_frame tail[1]; |
| 71 | } scm_stack; |
| 72 | |
| 73 | extern SCM scm_stack_type; |
| 74 | |
| 75 | #define SCM_STACKP(obj) (SCM_STRUCTP (obj) && SCM_STRUCT_VTABLE (obj) == scm_stack_type) |
| 76 | #define SCM_STACK_LENGTH(stack) (SCM_STACK (stack) -> length) |
| 77 | |
| 78 | #define SCM_FRAMEP(obj) (SCM_CONSP (obj) \ |
| 79 | && SCM_NIMP (SCM_CAR (obj)) \ |
| 80 | && SCM_STACKP (SCM_CAR (obj)) \ |
| 81 | && SCM_INUMP (SCM_CDR (obj))) \ |
| 82 | |
| 83 | |
| 84 | #define SCM_FRAME_REF(frame, slot) \ |
| 85 | (SCM_STACK (SCM_CAR (frame)) -> frames[SCM_INUM (SCM_CDR (frame))].slot) \ |
| 86 | |
| 87 | #define SCM_FRAME_NUMBER(frame) \ |
| 88 | (SCM_BACKWARDS_P \ |
| 89 | ? SCM_INUM (SCM_CDR (frame)) \ |
| 90 | : (SCM_STACK_LENGTH (SCM_CAR (frame)) \ |
| 91 | - SCM_INUM (SCM_CDR (frame)) \ |
| 92 | - 1)) \ |
| 93 | |
| 94 | #define SCM_FRAME_FLAGS(frame) SCM_FRAME_REF (frame, flags) |
| 95 | #define SCM_FRAME_SOURCE(frame) SCM_FRAME_REF (frame, source) |
| 96 | #define SCM_FRAME_PROC(frame) SCM_FRAME_REF (frame, proc) |
| 97 | #define SCM_FRAME_ARGS(frame) SCM_FRAME_REF (frame, args) |
| 98 | #define SCM_FRAME_PREV(frame) scm_frame_previous (frame) |
| 99 | #define SCM_FRAME_NEXT(frame) scm_frame_next (frame) |
| 100 | |
| 101 | #define SCM_FRAMEF_VOID (1L << 2) |
| 102 | #define SCM_FRAMEF_REAL (1L << 3) |
| 103 | #define SCM_FRAMEF_PROC (1L << 4) |
| 104 | #define SCM_FRAMEF_EVAL_ARGS (1L << 5) |
| 105 | #define SCM_FRAMEF_OVERFLOW (1L << 6) |
| 106 | |
| 107 | #define SCM_FRAME_VOID_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_VOID) |
| 108 | #define SCM_FRAME_REAL_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_REAL) |
| 109 | #define SCM_FRAME_PROC_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_PROC) |
| 110 | #define SCM_FRAME_EVAL_ARGS_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_EVAL_ARGS) |
| 111 | #define SCM_FRAME_OVERFLOW_P(frame) (SCM_FRAME_FLAGS (frame) & SCM_FRAMEF_OVERFLOW) |
| 112 | |
| 113 | \f |
| 114 | |
| 115 | SCM scm_stack_p SCM_P ((SCM obj)); |
| 116 | SCM scm_make_stack SCM_P ((SCM args)); |
| 117 | SCM scm_stack_id SCM_P ((SCM stack)); |
| 118 | SCM scm_stack_ref SCM_P ((SCM stack, SCM i)); |
| 119 | SCM scm_stack_length SCM_P ((SCM stack)); |
| 120 | |
| 121 | SCM scm_frame_p SCM_P ((SCM obj)); |
| 122 | SCM scm_last_stack_frame SCM_P ((SCM obj)); |
| 123 | SCM scm_frame_number SCM_P ((SCM frame)); |
| 124 | SCM scm_frame_source SCM_P ((SCM frame)); |
| 125 | SCM scm_frame_procedure SCM_P ((SCM frame)); |
| 126 | SCM scm_frame_arguments SCM_P ((SCM frame)); |
| 127 | SCM scm_frame_previous SCM_P ((SCM frame)); |
| 128 | SCM scm_frame_next SCM_P ((SCM frame)); |
| 129 | SCM scm_frame_real_p SCM_P ((SCM frame)); |
| 130 | SCM scm_frame_procedure_p SCM_P ((SCM frame)); |
| 131 | SCM scm_frame_evaluating_args_p SCM_P ((SCM frame)); |
| 132 | SCM scm_frame_overflow_p SCM_P ((SCM frame)); |
| 133 | |
| 134 | |
| 135 | void scm_init_stacks SCM_P ((void)); |
| 136 | |
| 137 | #endif /* STACKSH */ |