Commit | Line | Data |
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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 | * | |
73be1d9e MV |
8 | * This library is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
b29058ff | 12 | * |
73be1d9e | 13 | * This library is distributed in the hope that it will be useful, |
0f2d19dd | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
73be1d9e MV |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | * Lesser General Public License for more details. | |
b29058ff | 17 | * |
73be1d9e MV |
18 | * You should have received a copy of the GNU Lesser General Public |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
b29058ff | 22 | |
0f2d19dd | 23 | \f |
b29058ff | 24 | |
b4309c3c | 25 | #include "libguile/__scm.h" |
0f2d19dd | 26 | |
766c5eaf | 27 | #ifdef __ia64__ |
6a535440 | 28 | #include <signal.h> |
766c5eaf | 29 | #include <sys/ucontext.h> |
87855fa2 MV |
30 | extern unsigned long * __libc_ia64_register_backing_store_base; |
31 | #endif /* __ia64__ */ | |
0f2d19dd JB |
32 | \f |
33 | ||
5f144b10 | 34 | /* a continuation SCM is a non-immediate pointing to a heap cell with: |
2dbec7b5 GH |
35 | word 0: bits 0-15: smob type tag: scm_tc16_continuation. |
36 | bits 16-31: unused. | |
92c2555f | 37 | word 1: malloc block containing an scm_t_contregs structure with a |
5f144b10 GH |
38 | tail array of SCM_STACKITEM. the size of the array is stored |
39 | in the num_stack_items field of the structure. | |
40 | */ | |
41 | ||
87855fa2 | 42 | SCM_API scm_t_bits scm_tc16_continuation; |
5f144b10 | 43 | |
0f2d19dd JB |
44 | typedef struct |
45 | { | |
46 | SCM throw_value; | |
47 | jmp_buf jmpbuf; | |
48 | SCM dynenv; | |
766c5eaf RB |
49 | #ifdef __ia64__ |
50 | ucontext_t ctx; | |
51 | void *backing_store; | |
52 | unsigned long backing_store_size; | |
53 | #endif /* __ia64__ */ | |
5f144b10 | 54 | SCM_STACKITEM *base; /* base of the live stack, before it was saved. */ |
c014a02e ML |
55 | size_t num_stack_items; /* size of the saved stack. */ |
56 | unsigned long seq; /* dynamic root identifier. */ | |
0f2d19dd | 57 | |
5f144b10 GH |
58 | /* the most recently created debug frame on the live stack, before |
59 | it was saved. */ | |
92c2555f | 60 | struct scm_t_debug_frame *dframe; |
d0f6ceb8 | 61 | |
5f144b10 | 62 | SCM_STACKITEM stack[1]; /* copied stack of size num_stack_items. */ |
92c2555f | 63 | } scm_t_contregs; |
1be6b49c | 64 | |
e841c3e0 | 65 | #define SCM_CONTINUATIONP(x) SCM_TYP16_PREDICATE (scm_tc16_continuation, x) |
8b3bda20 | 66 | |
92c2555f | 67 | #define SCM_CONTREGS(x) ((scm_t_contregs *) SCM_CELL_WORD_1 (x)) |
8b3bda20 | 68 | |
5f144b10 | 69 | #define SCM_CONTINUATION_LENGTH(x) (SCM_CONTREGS (x)->num_stack_items) |
34d19ef6 | 70 | #define SCM_SET_CONTINUATION_LENGTH(x, n)\ |
5f144b10 | 71 | (SCM_CONTREGS (x)->num_stack_items = (n)) |
8b3bda20 DH |
72 | #define SCM_JMPBUF(x) ((SCM_CONTREGS (x))->jmpbuf) |
73 | #define SCM_DYNENV(x) ((SCM_CONTREGS (x))->dynenv) | |
74 | #define SCM_THROW_VALUE(x) ((SCM_CONTREGS (x))->throw_value) | |
75 | #define SCM_BASE(x) ((SCM_CONTREGS (x))->base) | |
76 | #define SCM_SEQ(x) ((SCM_CONTREGS (x))->seq) | |
77 | #define SCM_DFRAME(x) ((SCM_CONTREGS (x))->dframe) | |
0f2d19dd JB |
78 | |
79 | \f | |
80 | ||
87855fa2 MV |
81 | SCM_API SCM scm_make_continuation (int *first); |
82 | SCM_API void scm_init_continuations (void); | |
0f2d19dd | 83 | |
b29058ff | 84 | #endif /* SCM_CONTINUATIONS_H */ |
89e00824 ML |
85 | |
86 | /* | |
87 | Local Variables: | |
88 | c-file-style: "gnu" | |
89 | End: | |
90 | */ |