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0f2d19dd JB |
1 | /* classes: h_files */ |
2 | ||
b29058ff DH |
3 | #ifndef SCM_CONTINUATIONS_H |
4 | #define SCM_CONTINUATIONS_H | |
5 | ||
6 | /* Copyright (C) 1995,1996,2000,2001 Free Software Foundation, Inc. | |
7 | * | |
0f2d19dd JB |
8 | * This program is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2, or (at your option) | |
11 | * any later version. | |
b29058ff | 12 | * |
0f2d19dd JB |
13 | * This program is distributed in the hope that it will be useful, |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
b29058ff | 17 | * |
0f2d19dd JB |
18 | * You should have received a copy of the GNU General Public License |
19 | * along with this software; see the file COPYING. If not, write to | |
82892bed JB |
20 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
21 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
22 | * |
23 | * As a special exception, the Free Software Foundation gives permission | |
24 | * for additional uses of the text contained in its release of GUILE. | |
25 | * | |
26 | * The exception is that, if you link the GUILE library with other files | |
27 | * to produce an executable, this does not by itself cause the | |
28 | * resulting executable to be covered by the GNU General Public License. | |
29 | * Your use of that executable is in no way restricted on account of | |
30 | * linking the GUILE library code into it. | |
31 | * | |
32 | * This exception does not however invalidate any other reasons why | |
33 | * the executable file might be covered by the GNU General Public License. | |
34 | * | |
35 | * This exception applies only to the code released by the | |
36 | * Free Software Foundation under the name GUILE. If you copy | |
37 | * code from other Free Software Foundation releases into a copy of | |
38 | * GUILE, as the General Public License permits, the exception does | |
39 | * not apply to the code that you add in this way. To avoid misleading | |
40 | * anyone as to the status of such modified files, you must delete | |
41 | * this exception notice from them. | |
42 | * | |
43 | * If you write modifications of your own for GUILE, it is your choice | |
44 | * whether to permit this exception to apply to your modifications. | |
82892bed | 45 | * If you do not wish that, delete this exception notice. */ |
b29058ff | 46 | |
0f2d19dd | 47 | \f |
b29058ff | 48 | |
b4309c3c | 49 | #include "libguile/__scm.h" |
0f2d19dd JB |
50 | |
51 | \f | |
52 | ||
5f144b10 GH |
53 | /* a continuation SCM is a non-immediate pointing to a heap cell with: |
54 | word 0: bits 0-15: unused. | |
55 | bits 16-31: smob type tag: scm_tc16_continuation. | |
92c2555f | 56 | word 1: malloc block containing an scm_t_contregs structure with a |
5f144b10 GH |
57 | tail array of SCM_STACKITEM. the size of the array is stored |
58 | in the num_stack_items field of the structure. | |
59 | */ | |
60 | ||
92c2555f | 61 | extern scm_t_bits scm_tc16_continuation; |
5f144b10 | 62 | |
0f2d19dd JB |
63 | typedef struct |
64 | { | |
65 | SCM throw_value; | |
66 | jmp_buf jmpbuf; | |
67 | SCM dynenv; | |
5f144b10 | 68 | SCM_STACKITEM *base; /* base of the live stack, before it was saved. */ |
c014a02e ML |
69 | size_t num_stack_items; /* size of the saved stack. */ |
70 | unsigned long seq; /* dynamic root identifier. */ | |
0f2d19dd JB |
71 | |
72 | #ifdef DEBUG_EXTENSIONS | |
5f144b10 GH |
73 | /* the most recently created debug frame on the live stack, before |
74 | it was saved. */ | |
92c2555f | 75 | struct scm_t_debug_frame *dframe; |
0f2d19dd | 76 | #endif |
5f144b10 | 77 | SCM_STACKITEM stack[1]; /* copied stack of size num_stack_items. */ |
92c2555f | 78 | } scm_t_contregs; |
1be6b49c | 79 | |
e841c3e0 | 80 | #define SCM_CONTINUATIONP(x) SCM_TYP16_PREDICATE (scm_tc16_continuation, x) |
8b3bda20 | 81 | |
92c2555f | 82 | #define SCM_CONTREGS(x) ((scm_t_contregs *) SCM_CELL_WORD_1 (x)) |
8b3bda20 | 83 | |
5f144b10 GH |
84 | #define SCM_CONTINUATION_LENGTH(x) (SCM_CONTREGS (x)->num_stack_items) |
85 | #define SCM_SET_CONTINUATION_LENGTH(x,n)\ | |
86 | (SCM_CONTREGS (x)->num_stack_items = (n)) | |
8b3bda20 DH |
87 | #define SCM_JMPBUF(x) ((SCM_CONTREGS (x))->jmpbuf) |
88 | #define SCM_DYNENV(x) ((SCM_CONTREGS (x))->dynenv) | |
89 | #define SCM_THROW_VALUE(x) ((SCM_CONTREGS (x))->throw_value) | |
90 | #define SCM_BASE(x) ((SCM_CONTREGS (x))->base) | |
91 | #define SCM_SEQ(x) ((SCM_CONTREGS (x))->seq) | |
92 | #define SCM_DFRAME(x) ((SCM_CONTREGS (x))->dframe) | |
0f2d19dd JB |
93 | |
94 | \f | |
95 | ||
5f144b10 | 96 | extern SCM scm_make_continuation (int *first); |
7866a09b | 97 | extern void scm_init_continuations (void); |
0f2d19dd | 98 | |
b29058ff | 99 | #endif /* SCM_CONTINUATIONS_H */ |
89e00824 ML |
100 | |
101 | /* | |
102 | Local Variables: | |
103 | c-file-style: "gnu" | |
104 | End: | |
105 | */ |