| | 1 | /* classes: h_files */ |
| | 2 | |
| | 3 | #ifndef SCM_CONTINUATIONS_H |
| | 4 | #define SCM_CONTINUATIONS_H |
| | 5 | |
| | 6 | /* Copyright (C) 1995,1996,2000,2001 Free Software Foundation, Inc. |
| | 7 | * |
| | 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. |
| | 12 | * |
| | 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. |
| | 17 | * |
| | 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 |
| | 20 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
| | 21 | * Boston, MA 02111-1307 USA |
| | 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. |
| | 45 | * If you do not wish that, delete this exception notice. */ |
| | 46 | |
| | 47 | \f |
| | 48 | |
| | 49 | #include "libguile/__scm.h" |
| | 50 | |
| | 51 | #ifdef __ia64__ |
| | 52 | #include <sys/ucontext.h> |
| | 53 | extern unsigned long * __libc_ia64_register_backing_store_base; |
| | 54 | #endif /* __ia64__ */ |
| | 55 | \f |
| | 56 | |
| | 57 | /* a continuation SCM is a non-immediate pointing to a heap cell with: |
| | 58 | word 0: bits 0-15: smob type tag: scm_tc16_continuation. |
| | 59 | bits 16-31: unused. |
| | 60 | word 1: malloc block containing an scm_t_contregs structure with a |
| | 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 | |
| | 65 | SCM_API scm_t_bits scm_tc16_continuation; |
| | 66 | |
| | 67 | typedef struct |
| | 68 | { |
| | 69 | SCM throw_value; |
| | 70 | jmp_buf jmpbuf; |
| | 71 | SCM dynenv; |
| | 72 | #ifdef __ia64__ |
| | 73 | ucontext_t ctx; |
| | 74 | void *backing_store; |
| | 75 | unsigned long backing_store_size; |
| | 76 | #endif /* __ia64__ */ |
| | 77 | SCM_STACKITEM *base; /* base of the live stack, before it was saved. */ |
| | 78 | size_t num_stack_items; /* size of the saved stack. */ |
| | 79 | unsigned long seq; /* dynamic root identifier. */ |
| | 80 | |
| | 81 | #ifdef DEBUG_EXTENSIONS |
| | 82 | /* the most recently created debug frame on the live stack, before |
| | 83 | it was saved. */ |
| | 84 | struct scm_t_debug_frame *dframe; |
| | 85 | #endif |
| | 86 | SCM_STACKITEM stack[1]; /* copied stack of size num_stack_items. */ |
| | 87 | } scm_t_contregs; |
| | 88 | |
| | 89 | #define SCM_CONTINUATIONP(x) SCM_TYP16_PREDICATE (scm_tc16_continuation, x) |
| | 90 | |
| | 91 | #define SCM_CONTREGS(x) ((scm_t_contregs *) SCM_CELL_WORD_1 (x)) |
| | 92 | |
| | 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)) |
| | 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) |
| | 102 | |
| | 103 | \f |
| | 104 | |
| | 105 | SCM_API SCM scm_make_continuation (int *first); |
| | 106 | SCM_API void scm_init_continuations (void); |
| | 107 | |
| | 108 | #endif /* SCM_CONTINUATIONS_H */ |
| | 109 | |
| | 110 | /* |
| | 111 | Local Variables: |
| | 112 | c-file-style: "gnu" |
| | 113 | End: |
| | 114 | */ |
HCoop / bpt / guile.git / blame_incremental