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0f2d19dd JB |
1 | /* classes: h_files */ |
2 | ||
3 | #ifndef CONTINUATIONSH | |
4 | #define CONTINUATIONSH | |
f2c9fcb0 | 5 | /* Copyright (C) 1995,1996, 2000 Free Software Foundation, Inc. |
0f2d19dd JB |
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 | |
82892bed JB |
19 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
20 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
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. | |
82892bed | 44 | * If you do not wish that, delete this exception notice. */ |
0f2d19dd | 45 | \f |
b4309c3c | 46 | #include "libguile/__scm.h" |
0f2d19dd JB |
47 | |
48 | \f | |
49 | ||
5f144b10 GH |
50 | /* a continuation SCM is a non-immediate pointing to a heap cell with: |
51 | word 0: bits 0-15: unused. | |
52 | bits 16-31: smob type tag: scm_tc16_continuation. | |
1be6b49c | 53 | word 1: malloc block containing an scm_contregs_t structure with a |
5f144b10 GH |
54 | tail array of SCM_STACKITEM. the size of the array is stored |
55 | in the num_stack_items field of the structure. | |
56 | */ | |
57 | ||
58 | extern scm_bits_t scm_tc16_continuation; | |
59 | ||
0f2d19dd JB |
60 | typedef struct |
61 | { | |
62 | SCM throw_value; | |
63 | jmp_buf jmpbuf; | |
64 | SCM dynenv; | |
5f144b10 | 65 | SCM_STACKITEM *base; /* base of the live stack, before it was saved. */ |
1be6b49c ML |
66 | scm_bits_t num_stack_items; /* size of the saved stack. */ |
67 | scm_ubits_t seq; /* dynamic root identifier. */ | |
0f2d19dd JB |
68 | |
69 | #ifdef DEBUG_EXTENSIONS | |
5f144b10 GH |
70 | /* the most recently created debug frame on the live stack, before |
71 | it was saved. */ | |
1be6b49c | 72 | struct scm_debug_frame_t *dframe; |
0f2d19dd | 73 | #endif |
5f144b10 | 74 | SCM_STACKITEM stack[1]; /* copied stack of size num_stack_items. */ |
1be6b49c ML |
75 | } scm_contregs_t; |
76 | ||
77 | #if (SCM_DEBUG_DEPRECATED == 0) | |
78 | # define scm_contregs scm_contregs_t | |
79 | #endif | |
0f2d19dd | 80 | |
e841c3e0 | 81 | #define SCM_CONTINUATIONP(x) SCM_TYP16_PREDICATE (scm_tc16_continuation, x) |
8b3bda20 | 82 | |
1be6b49c | 83 | #define SCM_CONTREGS(x) ((scm_contregs_t *) SCM_CELL_WORD_1 (x)) |
8b3bda20 | 84 | |
5f144b10 GH |
85 | #define SCM_CONTINUATION_LENGTH(x) (SCM_CONTREGS (x)->num_stack_items) |
86 | #define SCM_SET_CONTINUATION_LENGTH(x,n)\ | |
87 | (SCM_CONTREGS (x)->num_stack_items = (n)) | |
8b3bda20 DH |
88 | #define SCM_JMPBUF(x) ((SCM_CONTREGS (x))->jmpbuf) |
89 | #define SCM_DYNENV(x) ((SCM_CONTREGS (x))->dynenv) | |
90 | #define SCM_THROW_VALUE(x) ((SCM_CONTREGS (x))->throw_value) | |
91 | #define SCM_BASE(x) ((SCM_CONTREGS (x))->base) | |
92 | #define SCM_SEQ(x) ((SCM_CONTREGS (x))->seq) | |
93 | #define SCM_DFRAME(x) ((SCM_CONTREGS (x))->dframe) | |
0f2d19dd JB |
94 | |
95 | \f | |
96 | ||
5f144b10 | 97 | extern SCM scm_make_continuation (int *first); |
7866a09b | 98 | extern void scm_init_continuations (void); |
0f2d19dd | 99 | |
0f2d19dd | 100 | #endif /* CONTINUATIONSH */ |
89e00824 ML |
101 | |
102 | /* | |
103 | Local Variables: | |
104 | c-file-style: "gnu" | |
105 | End: | |
106 | */ |