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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 | 50 | |
766c5eaf RB |
51 | #ifdef __ia64__ |
52 | #include <sys/ucontext.h> | |
87855fa2 MV |
53 | extern unsigned long * __libc_ia64_register_backing_store_base; |
54 | #endif /* __ia64__ */ | |
0f2d19dd JB |
55 | \f |
56 | ||
5f144b10 | 57 | /* a continuation SCM is a non-immediate pointing to a heap cell with: |
2dbec7b5 GH |
58 | word 0: bits 0-15: smob type tag: scm_tc16_continuation. |
59 | bits 16-31: unused. | |
92c2555f | 60 | word 1: malloc block containing an scm_t_contregs structure with a |
5f144b10 GH |
61 | tail array of SCM_STACKITEM. the size of the array is stored |
62 | in the num_stack_items field of the structure. | |
63 | */ | |
64 | ||
87855fa2 | 65 | SCM_API scm_t_bits scm_tc16_continuation; |
5f144b10 | 66 | |
0f2d19dd JB |
67 | typedef struct |
68 | { | |
69 | SCM throw_value; | |
70 | jmp_buf jmpbuf; | |
71 | SCM dynenv; | |
766c5eaf RB |
72 | #ifdef __ia64__ |
73 | ucontext_t ctx; | |
74 | void *backing_store; | |
75 | unsigned long backing_store_size; | |
76 | #endif /* __ia64__ */ | |
5f144b10 | 77 | SCM_STACKITEM *base; /* base of the live stack, before it was saved. */ |
c014a02e ML |
78 | size_t num_stack_items; /* size of the saved stack. */ |
79 | unsigned long seq; /* dynamic root identifier. */ | |
0f2d19dd JB |
80 | |
81 | #ifdef DEBUG_EXTENSIONS | |
5f144b10 GH |
82 | /* the most recently created debug frame on the live stack, before |
83 | it was saved. */ | |
92c2555f | 84 | struct scm_t_debug_frame *dframe; |
0f2d19dd | 85 | #endif |
5f144b10 | 86 | SCM_STACKITEM stack[1]; /* copied stack of size num_stack_items. */ |
92c2555f | 87 | } scm_t_contregs; |
1be6b49c | 88 | |
e841c3e0 | 89 | #define SCM_CONTINUATIONP(x) SCM_TYP16_PREDICATE (scm_tc16_continuation, x) |
8b3bda20 | 90 | |
92c2555f | 91 | #define SCM_CONTREGS(x) ((scm_t_contregs *) SCM_CELL_WORD_1 (x)) |
8b3bda20 | 92 | |
5f144b10 GH |
93 | #define SCM_CONTINUATION_LENGTH(x) (SCM_CONTREGS (x)->num_stack_items) |
94 | #define SCM_SET_CONTINUATION_LENGTH(x,n)\ | |
95 | (SCM_CONTREGS (x)->num_stack_items = (n)) | |
8b3bda20 DH |
96 | #define SCM_JMPBUF(x) ((SCM_CONTREGS (x))->jmpbuf) |
97 | #define SCM_DYNENV(x) ((SCM_CONTREGS (x))->dynenv) | |
98 | #define SCM_THROW_VALUE(x) ((SCM_CONTREGS (x))->throw_value) | |
99 | #define SCM_BASE(x) ((SCM_CONTREGS (x))->base) | |
100 | #define SCM_SEQ(x) ((SCM_CONTREGS (x))->seq) | |
101 | #define SCM_DFRAME(x) ((SCM_CONTREGS (x))->dframe) | |
0f2d19dd JB |
102 | |
103 | \f | |
104 | ||
87855fa2 MV |
105 | SCM_API SCM scm_make_continuation (int *first); |
106 | SCM_API void scm_init_continuations (void); | |
0f2d19dd | 107 | |
b29058ff | 108 | #endif /* SCM_CONTINUATIONS_H */ |
89e00824 ML |
109 | |
110 | /* | |
111 | Local Variables: | |
112 | c-file-style: "gnu" | |
113 | End: | |
114 | */ |