| 1 | /* Copyright (C) 1995,1996,1998,1999,2000,2001, 2003, 2004, 2006, 2008, 2010, 2011, 2012 Free Software Foundation, Inc. |
| 2 | * |
| 3 | * This library is free software; you can redistribute it and/or |
| 4 | * modify it under the terms of the GNU Lesser General Public License |
| 5 | * as published by the Free Software Foundation; either version 3 of |
| 6 | * the License, or (at your option) any later version. |
| 7 | * |
| 8 | * This library is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * Lesser General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU Lesser General Public |
| 14 | * License along with this library; if not, write to the Free Software |
| 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 16 | * 02110-1301 USA |
| 17 | */ |
| 18 | |
| 19 | |
| 20 | \f |
| 21 | |
| 22 | #ifdef HAVE_CONFIG_H |
| 23 | # include <config.h> |
| 24 | #endif |
| 25 | |
| 26 | #include <assert.h> |
| 27 | |
| 28 | #include "libguile/_scm.h" |
| 29 | #include "libguile/dynstack.h" |
| 30 | #include "libguile/eval.h" |
| 31 | #include "libguile/ports.h" |
| 32 | |
| 33 | #include "libguile/dynwind.h" |
| 34 | |
| 35 | |
| 36 | \f |
| 37 | |
| 38 | SCM |
| 39 | scm_dynamic_wind (SCM in_guard, SCM thunk, SCM out_guard) |
| 40 | #define FUNC_NAME "dynamic-wind" |
| 41 | { |
| 42 | SCM ans; |
| 43 | scm_i_thread *thread = SCM_I_CURRENT_THREAD; |
| 44 | |
| 45 | SCM_ASSERT (scm_is_true (scm_thunk_p (out_guard)), out_guard, |
| 46 | SCM_ARG3, FUNC_NAME); |
| 47 | |
| 48 | scm_call_0 (in_guard); |
| 49 | scm_dynstack_push_dynwind (&thread->dynstack, in_guard, out_guard); |
| 50 | |
| 51 | ans = scm_call_0 (thunk); |
| 52 | |
| 53 | scm_dynstack_pop (&thread->dynstack); |
| 54 | scm_call_0 (out_guard); |
| 55 | |
| 56 | return ans; |
| 57 | } |
| 58 | #undef FUNC_NAME |
| 59 | |
| 60 | |
| 61 | void |
| 62 | scm_dynwind_begin (scm_t_dynwind_flags flags) |
| 63 | { |
| 64 | scm_i_thread *thread = SCM_I_CURRENT_THREAD; |
| 65 | |
| 66 | scm_dynstack_push_frame (&thread->dynstack, flags); |
| 67 | } |
| 68 | |
| 69 | void |
| 70 | scm_dynwind_end (void) |
| 71 | { |
| 72 | scm_dynstack_unwind_frame (&SCM_I_CURRENT_THREAD->dynstack); |
| 73 | } |
| 74 | |
| 75 | void |
| 76 | scm_dynwind_unwind_handler (void (*proc) (void *), void *data, |
| 77 | scm_t_wind_flags flags) |
| 78 | { |
| 79 | scm_i_thread *thread = SCM_I_CURRENT_THREAD; |
| 80 | scm_t_dynstack *dynstack = &thread->dynstack; |
| 81 | |
| 82 | scm_dynstack_push_unwinder (dynstack, flags, proc, data); |
| 83 | } |
| 84 | |
| 85 | void |
| 86 | scm_dynwind_rewind_handler (void (*proc) (void *), void *data, |
| 87 | scm_t_wind_flags flags) |
| 88 | { |
| 89 | scm_i_thread *thread = SCM_I_CURRENT_THREAD; |
| 90 | scm_t_dynstack *dynstack = &thread->dynstack; |
| 91 | |
| 92 | scm_dynstack_push_rewinder (dynstack, 0, proc, data); |
| 93 | |
| 94 | if (flags & SCM_F_WIND_EXPLICITLY) |
| 95 | proc (data); |
| 96 | } |
| 97 | |
| 98 | void |
| 99 | scm_dynwind_unwind_handler_with_scm (void (*proc) (SCM), SCM data, |
| 100 | scm_t_wind_flags flags) |
| 101 | { |
| 102 | /* FIXME: This is not a safe cast. */ |
| 103 | scm_dynwind_unwind_handler ((scm_t_guard) proc, SCM2PTR (data), flags); |
| 104 | } |
| 105 | |
| 106 | void |
| 107 | scm_dynwind_rewind_handler_with_scm (void (*proc) (SCM), SCM data, |
| 108 | scm_t_wind_flags flags) |
| 109 | { |
| 110 | /* FIXME: This is not a safe cast. */ |
| 111 | scm_dynwind_rewind_handler ((scm_t_guard) proc, SCM2PTR (data), flags); |
| 112 | } |
| 113 | |
| 114 | void |
| 115 | scm_dynwind_free (void *mem) |
| 116 | { |
| 117 | scm_dynwind_unwind_handler (free, mem, SCM_F_WIND_EXPLICITLY); |
| 118 | } |
| 119 | |
| 120 | void |
| 121 | scm_swap_bindings (SCM vars, SCM vals) |
| 122 | { |
| 123 | SCM tmp; |
| 124 | while (scm_is_pair (vals)) |
| 125 | { |
| 126 | tmp = SCM_VARIABLE_REF (SCM_CAR (vars)); |
| 127 | SCM_VARIABLE_SET (SCM_CAR (vars), SCM_CAR (vals)); |
| 128 | SCM_SETCAR (vals, tmp); |
| 129 | vars = SCM_CDR (vars); |
| 130 | vals = SCM_CDR (vals); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | void |
| 135 | scm_init_dynwind () |
| 136 | { |
| 137 | #include "libguile/dynwind.x" |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | Local Variables: |
| 142 | c-file-style: "gnu" |
| 143 | End: |
| 144 | */ |