Software tool evaluates safety-critical program code

Software tool evaluates safety-critical program code

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By eeNews Europe

The tool analyses structured C programs with complex memory usages, but without recursion or dynamic memory allocation. This targets embedded applications as found in earth trans­por­tation, nuclear energy, medical instrumentation, aeronautics and space flight, in particular syn­chro­nous control/command such as electric flight control.

Astrée analyses whether the C programming language is used correctly and whether there can be any run-time errors during any execution in any environment. This covers any use of C that has undefined behaviour as defined by the C99 standard, or that violates hardware-specific aspects as defined by the C99 standard.

Astrée reports any:

  • division by zero,
  • out-of-bounds array indexing,
  • erroneous pointer manipulation and dereferencing (NULL, uninitialized and dangling pointers),
  • integer and floating-point arithmetic overflow,
  • violation of optional user-defined assertions to prove additional run-time properties (similar to assert diagnostics),

code it can prove to be unreachable under any circumstances (note that this is not neces­sarily all unreachable code),

  • read access to uninitialized variables.

Astrée is sound for floating-point computations and handles them precisely and safely. It takes all possible rounding errors into account.

Astrée offers powerful annotation mechanisms, which enable you to make external knowledge available to it, or to selectively influence the analysis precision for individual loops or data structures. Detailed messages and an intuitive GUI help you understand alarms about potential errors. Actual errors can then be fixed, and in case of a false alarm, the analyser can be tuned to avoid it. These mechanisms allow to perform analyses with very few or even zero false alarms.

In contrast, general-purpose static analysers aim at analysing any application written in a given programming language. They can rely on language related properties to find potential run-time errors. Specialized static analysers put additional restrictions on the applications so as to be able to take specific program structures into account.

In contrast, Astrée is domain-aware. It thus knows facts about ap­plication domains that are indispensable to make sophisticated proofs. For example, for control/command programs, Astrée takes the logic and functional properties of control/command theory into account.

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