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make-stack works on delimited continuations

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* libguile/stacks.c (scm_make_stack, scm_stack_id):
* libguile/vm.c (scm_i_vm_cont_to_frame): Allow delimited continuations
  as the argument to make-stack.
This commit is contained in:
Andy Wingo 2014-04-16 19:16:10 +02:00
parent a285f38fda
commit 4cfa92d60f
3 changed files with 24 additions and 0 deletions
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10
libguile/stacks.c
View file

@ -279,6 +279,13 @@ SCM_DEFINE (scm_make_stack, "make-stack", 1, 0, 1,
if (!scm_i_continuation_to_frame (obj, &frame))
return SCM_BOOL_F;
}
else if (SCM_PROGRAM_P (obj) && SCM_PROGRAM_IS_PARTIAL_CONTINUATION (obj))
{
kind = SCM_VM_FRAME_KIND_CONT;
if (!scm_i_vm_cont_to_frame (SCM_PROGRAM_FREE_VARIABLE_REF (obj, 0),
&frame))
return SCM_BOOL_F;
}
else
{
SCM_WRONG_TYPE_ARG (SCM_ARG1, obj);
@ -347,6 +354,9 @@ SCM_DEFINE (scm_stack_id, "stack-id", 1, 0, 0,
else if (SCM_CONTINUATIONP (stack))
/* FIXME: implement me */
return SCM_BOOL_F;
else if (SCM_PROGRAM_P (stack) && SCM_PROGRAM_IS_PARTIAL_CONTINUATION (stack))
/* FIXME: implement me */
return SCM_BOOL_F;
else
{
SCM_WRONG_TYPE_ARG (SCM_ARG1, stack);

13
libguile/vm.c
View file

@ -112,6 +112,19 @@ scm_i_vm_cont_print (SCM x, SCM port, scm_print_state *pstate)
scm_puts_unlocked (">", port);
}
int
scm_i_vm_cont_to_frame (SCM cont, struct scm_frame *frame)
{
struct scm_vm_cont *data = SCM_VM_CONT_DATA (cont);
frame->stack_holder = data;
frame->fp_offset = (data->fp + data->reloc) - data->stack_base;
frame->sp_offset = (data->sp + data->reloc) - data->stack_base;
frame->ip = data->ra;
return 1;
}
/* Ideally we could avoid copying the C stack if the continuation root
is inside VM code, and call/cc was invoked within that same call to
vm_run. That's currently not implemented. */

1
libguile/vm.h
View file

@ -101,6 +101,7 @@ SCM_INTERNAL SCM scm_i_vm_capture_stack (SCM *stack_base, SCM *fp, SCM *sp,
scm_t_uint32 *ra,
scm_t_dynstack *dynstack,
scm_t_uint32 flags);
SCM_INTERNAL int scm_i_vm_cont_to_frame (SCM cont, struct scm_frame *frame);
SCM_INTERNAL void scm_i_vm_cont_print (SCM x, SCM port,
scm_print_state *pstate);
SCM_INTERNAL void scm_bootstrap_vm (void);