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Proof of runtime packages #51
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Prove the runtime packages in the minimal runtime. For those packages that require code that is not SPARK compatible SPARK has been turned off with a comment.
System.Parameterscannot be SPARK but SPARK also cannot be turned off explicitly as its types could not be used in SPARK code then. InInterfaces.Cthe long double has been disabled as it is not supported in SPARK.The
System.Arith64has been proven forAdd_With_Ovflo_CheckandSubtract_With_Ovflo_Checkfor the absence of runtime errors. The missing functions and the two unproven lemmas are handled in #50. Since the properties of the conversion functions rest on assumptions about the binary integer representation they have been moved to a separate package to support unit tests.