[armedbear-devel] Lazy allocation of LispStackFrames

[Dmitry Nadezhin]

LispStackFrame object are allocated on every LispThread.execute(...) .
However, they are seldom (to inspect stack trace).
This patch delays allocation of LispStackFrame objects until they are requested.

Raw information about stack frames is stored in stack.
Stack is an Object[] array ( more precisely a list of 8 MB Object[] arrays ).
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