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Optimize make-stack

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* libguile/continuations.h:
* libguile/continuations.c (scm_i_continuation_to_frame): Operate on
  low-level C structures instead of heap objects.

* libguile/frames.h:
* libguile/frames.c (frame_offset, frame_stack_base): Const args.
  (scm_c_frame_closure): New helper.
  (scm_frame_procedure): Use the new helper.

* libguile/stacks.c (stack_depth, narrow_stack, scm_make_stack): Rework
  to avoid allocating frames as we traverse the stack, and to avoid an
  n**2 case where there are outer cuts.
This commit is contained in:
Andy Wingo 2014-04-14 16:31:02 +02:00
parent 8de051da47
commit 3b14dd2f27
5 changed files with 103 additions and 80 deletions
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4
libguile/frames.h
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@ -167,6 +167,10 @@ enum scm_vm_frame_kind
SCM_INTERNAL SCM* scm_i_frame_stack_base (SCM frame);
SCM_INTERNAL scm_t_ptrdiff scm_i_frame_offset (SCM frame);
/* See notes in frames.c before using this. */
SCM_INTERNAL SCM scm_c_frame_closure (enum scm_vm_frame_kind kind,
const struct scm_frame *frame);
SCM_INTERNAL SCM scm_c_make_frame (enum scm_vm_frame_kind kind,
const struct scm_frame *frame);