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Add SCM_F_DYNSTACK_PROMPT_PUSH_NARGS prompt flag

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* libguile/dynstack.h (scm_t_dynstack_prompt_flags): New flag,
  SCM_F_DYNSTACK_PROMPT_PUSH_NARGS, set if the continuation expects the
  number of args to be pushed on the top of the stack.

* libguile/control.c (scm_c_abort): Only push nargs if requested.

* libguile/eval.c (eval):
* libguile/throw.c (pre_init_catch):
* libguile/vm-i-system.c (prompt): Set
  SCM_F_DYNSTACK_PROMPT_PUSH_NARGS.
This commit is contained in:
Andy Wingo 2013-10-14 16:05:45 +02:00
parent b7f10defe6
commit c6cd692f08
5 changed files with 9 additions and 4 deletions
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1
libguile/vm-i-system.c
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@ -1453,6 +1453,7 @@ VM_DEFINE_INSTRUCTION (87, prompt, "prompt", 4, 2, 0)
SYNC_REGISTER ();
/* Push the prompt onto the dynamic stack. */
flags = escape_only_p ? SCM_F_DYNSTACK_PROMPT_ESCAPE_ONLY : 0;
flags |= SCM_F_DYNSTACK_PROMPT_PUSH_NARGS;
scm_dynstack_push_prompt (&current_thread->dynstack, flags, k,
fp, sp, ip + offset, &registers);
NEXT;