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The verification system implements Hoare-logic and is supported by a theorem prover. Buffer Overflow is only one of many basic correctness properties that can be verified. Properties that can be verified are only limited to what can be expressed as an assertion in first-order logic.
SPARK is a small language (compared to C++ or Java...) but the depth and soundness of verification is unmatched by anything like FindBugs, SPLINT, ESC/Java or any of the other tools for the "popular" languages.
(If you don't know or care what soundness is in the context of static analysis, then you've probably missed the point of this post...
- Rod Chapman, Praxis