| /* Copyright 1995-1996,2000-2001,2006,2008-2010,2012-2014,2018 | |
| Free Software Foundation, Inc. | |
| This file is part of Guile. | |
| Guile is free software: you can redistribute it and/or modify it | |
| under the terms of the GNU Lesser General Public License as published | |
| by the Free Software Foundation, either version 3 of the License, or | |
| (at your option) any later version. | |
| Guile is distributed in the hope that it will be useful, but WITHOUT | |
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public | |
| License for more details. | |
| You should have received a copy of the GNU Lesser General Public | |
| License along with Guile. If not, see | |
| <https://www.gnu.org/licenses/>. */ | |
| /* a continuation SCM is a non-immediate pointing to a heap cell with: | |
| word 0: bits 0-15: smob type tag: scm_tc16_continuation. | |
| bits 16-31: unused. | |
| word 1: malloc block containing an scm_t_contregs structure with a | |
| tail array of SCM_STACKITEM. the size of the array is stored | |
| in the num_stack_items field of the structure. | |
| */ | |
| typedef struct | |
| { | |
| jmp_buf jmpbuf; | |
| void *auxiliary_stack; | |
| unsigned long auxiliary_stack_size; | |
| size_t num_stack_items; /* size of the saved stack. */ | |
| SCM root; /* continuation root identifier. */ | |
| SCM vm_cont; /* vm's stack and regs */ | |
| /* The offset from the live stack location to this copy. This is | |
| used to adjust pointers from within the copied stack to the stack | |
| itself. | |
| Thus, when you read a pointer from the copied stack that points | |
| into the live stack, you need to add OFFSET so that it points | |
| into the copy. | |
| */ | |
| ptrdiff_t offset; | |
| SCM_STACKITEM stack[1]; /* copied stack of size num_stack_items. */ | |
| } scm_t_contregs; | |
| SCM_INTERNAL SCM scm_i_make_continuation (scm_thread *thread, SCM vm_cont); | |
| SCM_INTERNAL void scm_i_reinstate_continuation (SCM cont, | |
| uint8_t *mra) SCM_NORETURN; | |
| SCM_INTERNAL int scm_i_continuation_to_frame (SCM cont, | |
| struct scm_frame *frame); | |
| SCM_INTERNAL scm_t_contregs* scm_i_contregs (SCM contregs); | |
| SCM_API void *scm_c_with_continuation_barrier (void *(*func)(void*), void *); | |
| SCM_API SCM scm_with_continuation_barrier (SCM proc); | |
| SCM_INTERNAL SCM | |
| scm_i_with_continuation_barrier (scm_t_catch_body body, | |
| void *body_data, | |
| scm_t_catch_handler handler, | |
| void *handler_data, | |
| scm_t_catch_handler pre_unwind_handler, | |
| void *pre_unwind_handler_data); | |
| SCM_INTERNAL void scm_init_continuations (void); | |