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Re: [cdt-dev] Variable on stack or heap?
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On 7 Nov 2009, at 17:09, Gavin Rehkemper wrote:
So you're saying that because of this particular case we can never
know if pInt is on the stack or heap? Is there a way to check the
last assignment?
How would you know which comes last without running it? An AST is for
one translation unit only remember - a global (for example) could also
be changed elsewhere. Statically tracing the execution path of a non-
trivial program is virtually impossible.
Pete, we are writing an eclipse plugin that is doing some
intelligent code refactoring. To take an example, say we're trying
to get the size of an array. We could either use sizeof() or
malloc_usable_size() - and we want to figure out which one to use
given a particular variable.
You can tell the difference between a pointer and an array statically,
but not if it's been passed to a function or cast to something else.
After all, a function taking a pointer could be called with both
malloc'ed and array-based memory in the same program...
Pete
--
Peter J. Vidler
Senior Systems Developer, TTE Systems Ltd
p.vidler@xxxxxxxxxxxxxxx
+44 (0)116 223 1684
Registered address: 106 New Walk, Leicester, LE1 7EA
Company number: 05058157
VAT registration: 913 4859 12
www.tte-systems.com
