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error if given an unrewindable partial continuation

Browse source 
* libguile/vm-engine.c (vm_error_continuation_not_rewindable):
* libguile/vm-i-system.c (partial-cont-call):
* libguile/vm.h (SCM_VM_CONT_PARTIAL_P):
  (SCM_VM_CONT_REWINDABLE_P): Fix a bug in which we weren't checking if
  a partial continuation was actually rewindable.
This commit is contained in:
Andy Wingo 2010-02-25 00:18:07 +01:00
parent 35ac785286
commit b3950ad6d8
3 changed files with 11 additions and 2 deletions
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4
libguile/vm-i-system.c
View file

@ -999,6 +999,10 @@ VM_DEFINE_INSTRUCTION (94, partial_cont_call, "partial-cont-call", 0, -1, 0)
POP (intwinds);
POP (vmcont);
SYNC_REGISTER ();
if (SCM_UNLIKELY (!SCM_VM_CONT_REWINDABLE_P (vmcont)))
{ finish_args = vmcont;
goto vm_error_continuation_not_rewindable;
}
vm_reinstate_partial_continuation (vm, vmcont, intwinds, sp + 1 - fp, fp);
CACHE_REGISTER ();
program = SCM_FRAME_PROGRAM (fp);