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fix frame dynamic linkage in the face of partial continuation application

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* libguile/vm-i-system.c (new-frame): Though it was appealing to set the
  dynamic link here on the incomplete frame, we no longer do that, for
  the reasons mentioned in the code.
  (call, mv-call): Adapt to set the frame's dynamic link.

* libguile/vm-engine.c (vm_engine): Don't set dynamic link here, even
  for boot program.

* libguile/frames.c (scm_frame_num_locals, scm_frame_local_ref)
  (scm_frame_local_set_x): Fix up not-yet-active frame detection.
This commit is contained in:
Andy Wingo 2011-03-15 23:33:32 +01:00
parent 958173e489
commit 9b709b0fe1
3 changed files with 40 additions and 17 deletions
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6
libguile/frames.c
View file

@ -124,7 +124,7 @@ SCM_DEFINE (scm_frame_num_locals, "frame-num-locals", 1, 0, 0,
p = SCM_FRAME_STACK_ADDRESS (SCM_VM_FRAME_FP (frame));
while (p <= sp)
{
if (p + 1 < sp && p[1] == (SCM)0)
if (p[0] == (SCM)0)
/* skip over not-yet-active frame */
p += 3;
else
@ -154,7 +154,7 @@ SCM_DEFINE (scm_frame_local_ref, "frame-local-ref", 2, 0, 0,
p = SCM_FRAME_STACK_ADDRESS (SCM_VM_FRAME_FP (frame));
while (p <= sp)
{
if (p + 1 < sp && p[1] == (SCM)0)
if (p[0] == (SCM)0)
/* skip over not-yet-active frame */
p += 3;
else if (n == i)
@ -186,7 +186,7 @@ SCM_DEFINE (scm_frame_local_set_x, "frame-local-set!", 3, 0, 0,
p = SCM_FRAME_STACK_ADDRESS (SCM_VM_FRAME_FP (frame));
while (p <= sp)
{
if (p + 1 < sp && p[1] == (SCM)0)
if (p[0] == (SCM)0)
/* skip over not-yet-active frame */
p += 3;
else if (n == i)

2
libguile/vm-engine.c
View file

@ -93,7 +93,7 @@ VM_NAME (SCM vm, SCM program, SCM *argv, int nargs)
fp = sp + 1;
ip = SCM_C_OBJCODE_BASE (bp);
/* MV-call frame, function & arguments */
PUSH ((SCM)fp); /* dynamic link */
PUSH (0); /* dynamic link */
PUSH (0); /* mvra */
PUSH (0); /* ra */
PUSH (prog);

25
libguile/vm-i-system.c
View file

@ -756,7 +756,12 @@ VM_DEFINE_INSTRUCTION (52, new_frame, "new-frame", 0, 0, 3)
{
/* NB: if you change this, see frames.c:vm-frame-num-locals */
/* and frames.h, vm-engine.c, etc of course */
PUSH ((SCM)fp); /* dynamic link */
/* We don't initialize the dynamic link here because we don't actually
know that this frame will point to the current fp: it could be
placed elsewhere on the stack if captured in a partial
continuation, and invoked from some other context. */
PUSH (0); /* dynamic link */
PUSH (0); /* mvra */
PUSH (0); /* ra */
NEXT;
@ -790,11 +795,20 @@ VM_DEFINE_INSTRUCTION (53, call, "call", 1, -1, 1)
}
CACHE_PROGRAM ();
{
SCM *old_fp = fp;
fp = sp - nargs + 1;
ASSERT (SCM_FRAME_DYNAMIC_LINK (fp) == 0);
ASSERT (SCM_FRAME_RETURN_ADDRESS (fp) == 0);
ASSERT (SCM_FRAME_MV_RETURN_ADDRESS (fp) == 0);
SCM_FRAME_SET_DYNAMIC_LINK (fp, old_fp);
SCM_FRAME_SET_RETURN_ADDRESS (fp, ip);
SCM_FRAME_SET_MV_RETURN_ADDRESS (fp, 0);
}
ip = SCM_C_OBJCODE_BASE (bp);
PUSH_CONTINUATION_HOOK ();
APPLY_HOOK ();
@ -1091,11 +1105,20 @@ VM_DEFINE_INSTRUCTION (62, mv_call, "mv-call", 4, -1, 1)
}
CACHE_PROGRAM ();
{
SCM *old_fp = fp;
fp = sp - nargs + 1;
ASSERT (SCM_FRAME_DYNAMIC_LINK (fp) == 0);
ASSERT (SCM_FRAME_RETURN_ADDRESS (fp) == 0);
ASSERT (SCM_FRAME_MV_RETURN_ADDRESS (fp) == 0);
SCM_FRAME_SET_DYNAMIC_LINK (fp, old_fp);
SCM_FRAME_SET_RETURN_ADDRESS (fp, ip);
SCM_FRAME_SET_MV_RETURN_ADDRESS (fp, mvra);
}
ip = SCM_C_OBJCODE_BASE (bp);
PUSH_CONTINUATION_HOOK ();
APPLY_HOOK ();