Oh, and LGTM.

http://codereview.chromium.org/49029/diff/2007/2010
File src/virtual-frame.cc (right):

http://codereview.chromium.org/49029/diff/2007/2010#newcode216
Line 216: // [min(stack_pointer_,begin), end).
You mean min(stack_pointer + 1, begin)?

It might be better in the sense of avoiding surprise to not make this
general and to require the caller to give a proper range (ie, beginning
at or below stack_pointer + 1).  It would be more explicit at the
calling sites (both of them!) what's going on (and I think it's true now
anyway).

http://codereview.chromium.org/49029/diff/2007/2010#newcode220
Line 220: if (begin > stack_pointer_) {
This whole think is just complicated enough to need some comments so it
doesn't get off by one when maintaining it.

http://codereview.chromium.org/49029

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